4434ff1d38
have a write in progress. Otherwise one can get in an infinite loop trying to get them all flushed. Submitted by: Matthew Dillon <dillon@apollo.backplane.com>
4689 lines
141 KiB
C
4689 lines
141 KiB
C
/*
|
|
* Copyright 1998 Marshall Kirk McKusick. All Rights Reserved.
|
|
*
|
|
* The soft updates code is derived from the appendix of a University
|
|
* of Michigan technical report (Gregory R. Ganger and Yale N. Patt,
|
|
* "Soft Updates: A Solution to the Metadata Update Problem in File
|
|
* Systems", CSE-TR-254-95, August 1995).
|
|
*
|
|
* The following are the copyrights and redistribution conditions that
|
|
* apply to this copy of the soft update software. For a license
|
|
* to use, redistribute or sell the soft update software under
|
|
* conditions other than those described here, please contact the
|
|
* author at one of the following addresses:
|
|
*
|
|
* Marshall Kirk McKusick mckusick@mckusick.com
|
|
* 1614 Oxford Street +1-510-843-9542
|
|
* Berkeley, CA 94709-1608
|
|
* USA
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. None of the names of McKusick, Ganger, Patt, or the University of
|
|
* Michigan may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
* 4. Redistributions in any form must be accompanied by information on
|
|
* how to obtain complete source code for any accompanying software
|
|
* that uses this software. This source code must either be included
|
|
* in the distribution or be available for no more than the cost of
|
|
* distribution plus a nominal fee, and must be freely redistributable
|
|
* under reasonable conditions. For an executable file, complete
|
|
* source code means the source code for all modules it contains.
|
|
* It does not mean source code for modules or files that typically
|
|
* accompany the operating system on which the executable file runs,
|
|
* e.g., standard library modules or system header files.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY MARSHALL KIRK MCKUSICK ``AS IS'' AND ANY
|
|
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL MARSHALL KIRK MCKUSICK BE LIABLE FOR
|
|
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* from: @(#)ffs_softdep.c 9.56 (McKusick) 1/17/00
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* For now we want the safety net that the DIAGNOSTIC and DEBUG flags provide.
|
|
*/
|
|
#ifndef DIAGNOSTIC
|
|
#define DIAGNOSTIC
|
|
#endif
|
|
#ifndef DEBUG
|
|
#define DEBUG
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/conf.h>
|
|
#include <ufs/ufs/dir.h>
|
|
#include <ufs/ufs/quota.h>
|
|
#include <ufs/ufs/inode.h>
|
|
#include <ufs/ufs/ufsmount.h>
|
|
#include <ufs/ffs/fs.h>
|
|
#include <ufs/ffs/softdep.h>
|
|
#include <ufs/ffs/ffs_extern.h>
|
|
#include <ufs/ufs/ufs_extern.h>
|
|
|
|
/*
|
|
* These definitions need to be adapted to the system to which
|
|
* this file is being ported.
|
|
*/
|
|
/*
|
|
* malloc types defined for the softdep system.
|
|
*/
|
|
MALLOC_DEFINE(M_PAGEDEP, "pagedep","File page dependencies");
|
|
MALLOC_DEFINE(M_INODEDEP, "inodedep","Inode dependencies");
|
|
MALLOC_DEFINE(M_NEWBLK, "newblk","New block allocation");
|
|
MALLOC_DEFINE(M_BMSAFEMAP, "bmsafemap","Block or frag allocated from cyl group map");
|
|
MALLOC_DEFINE(M_ALLOCDIRECT, "allocdirect","Block or frag dependency for an inode");
|
|
MALLOC_DEFINE(M_INDIRDEP, "indirdep","Indirect block dependencies");
|
|
MALLOC_DEFINE(M_ALLOCINDIR, "allocindir","Block dependency for an indirect block");
|
|
MALLOC_DEFINE(M_FREEFRAG, "freefrag","Previously used frag for an inode");
|
|
MALLOC_DEFINE(M_FREEBLKS, "freeblks","Blocks freed from an inode");
|
|
MALLOC_DEFINE(M_FREEFILE, "freefile","Inode deallocated");
|
|
MALLOC_DEFINE(M_DIRADD, "diradd","New directory entry");
|
|
MALLOC_DEFINE(M_MKDIR, "mkdir","New directory");
|
|
MALLOC_DEFINE(M_DIRREM, "dirrem","Directory entry deleted");
|
|
|
|
#define D_PAGEDEP 0
|
|
#define D_INODEDEP 1
|
|
#define D_NEWBLK 2
|
|
#define D_BMSAFEMAP 3
|
|
#define D_ALLOCDIRECT 4
|
|
#define D_INDIRDEP 5
|
|
#define D_ALLOCINDIR 6
|
|
#define D_FREEFRAG 7
|
|
#define D_FREEBLKS 8
|
|
#define D_FREEFILE 9
|
|
#define D_DIRADD 10
|
|
#define D_MKDIR 11
|
|
#define D_DIRREM 12
|
|
#define D_LAST D_DIRREM
|
|
|
|
/*
|
|
* translate from workitem type to memory type
|
|
* MUST match the defines above, such that memtype[D_XXX] == M_XXX
|
|
*/
|
|
static struct malloc_type *memtype[] = {
|
|
M_PAGEDEP,
|
|
M_INODEDEP,
|
|
M_NEWBLK,
|
|
M_BMSAFEMAP,
|
|
M_ALLOCDIRECT,
|
|
M_INDIRDEP,
|
|
M_ALLOCINDIR,
|
|
M_FREEFRAG,
|
|
M_FREEBLKS,
|
|
M_FREEFILE,
|
|
M_DIRADD,
|
|
M_MKDIR,
|
|
M_DIRREM
|
|
};
|
|
|
|
#define DtoM(type) (memtype[type])
|
|
|
|
/*
|
|
* Names of malloc types.
|
|
*/
|
|
#define TYPENAME(type) \
|
|
((unsigned)(type) < D_LAST ? memtype[type]->ks_shortdesc : "???")
|
|
#define CURPROC curproc
|
|
/*
|
|
* End system adaptaion definitions.
|
|
*/
|
|
|
|
/*
|
|
* Internal function prototypes.
|
|
*/
|
|
static void softdep_error __P((char *, int));
|
|
static void drain_output __P((struct vnode *, int));
|
|
static int getdirtybuf __P((struct buf **, int));
|
|
static void clear_remove __P((struct proc *));
|
|
static void clear_inodedeps __P((struct proc *));
|
|
static int flush_pagedep_deps __P((struct vnode *, struct mount *,
|
|
struct diraddhd *));
|
|
static int flush_inodedep_deps __P((struct fs *, ino_t));
|
|
static int handle_written_filepage __P((struct pagedep *, struct buf *));
|
|
static void diradd_inode_written __P((struct diradd *, struct inodedep *));
|
|
static int handle_written_inodeblock __P((struct inodedep *, struct buf *));
|
|
static void handle_allocdirect_partdone __P((struct allocdirect *));
|
|
static void handle_allocindir_partdone __P((struct allocindir *));
|
|
static void initiate_write_filepage __P((struct pagedep *, struct buf *));
|
|
static void handle_written_mkdir __P((struct mkdir *, int));
|
|
static void initiate_write_inodeblock __P((struct inodedep *, struct buf *));
|
|
static void handle_workitem_freefile __P((struct freefile *));
|
|
static void handle_workitem_remove __P((struct dirrem *));
|
|
static struct dirrem *newdirrem __P((struct buf *, struct inode *,
|
|
struct inode *, int, struct dirrem **));
|
|
static void free_diradd __P((struct diradd *));
|
|
static void free_allocindir __P((struct allocindir *, struct inodedep *));
|
|
static int indir_trunc __P((struct inode *, ufs_daddr_t, int, ufs_lbn_t,
|
|
long *));
|
|
static void deallocate_dependencies __P((struct buf *, struct inodedep *));
|
|
static void free_allocdirect __P((struct allocdirectlst *,
|
|
struct allocdirect *, int));
|
|
static int check_inode_unwritten __P((struct inodedep *));
|
|
static int free_inodedep __P((struct inodedep *));
|
|
static void handle_workitem_freeblocks __P((struct freeblks *));
|
|
static void merge_inode_lists __P((struct inodedep *));
|
|
static void setup_allocindir_phase2 __P((struct buf *, struct inode *,
|
|
struct allocindir *));
|
|
static struct allocindir *newallocindir __P((struct inode *, int, ufs_daddr_t,
|
|
ufs_daddr_t));
|
|
static void handle_workitem_freefrag __P((struct freefrag *));
|
|
static struct freefrag *newfreefrag __P((struct inode *, ufs_daddr_t, long));
|
|
static void allocdirect_merge __P((struct allocdirectlst *,
|
|
struct allocdirect *, struct allocdirect *));
|
|
static struct bmsafemap *bmsafemap_lookup __P((struct buf *));
|
|
static int newblk_lookup __P((struct fs *, ufs_daddr_t, int,
|
|
struct newblk **));
|
|
static int inodedep_lookup __P((struct fs *, ino_t, int, struct inodedep **));
|
|
static int pagedep_lookup __P((struct inode *, ufs_lbn_t, int,
|
|
struct pagedep **));
|
|
static void pause_timer __P((void *));
|
|
static int request_cleanup __P((int, int));
|
|
static void add_to_worklist __P((struct worklist *));
|
|
|
|
/*
|
|
* Exported softdep operations.
|
|
*/
|
|
static void softdep_disk_io_initiation __P((struct buf *));
|
|
static void softdep_disk_write_complete __P((struct buf *));
|
|
static void softdep_deallocate_dependencies __P((struct buf *));
|
|
static int softdep_fsync __P((struct vnode *));
|
|
static int softdep_process_worklist __P((struct mount *));
|
|
static void softdep_move_dependencies __P((struct buf *, struct buf *));
|
|
static int softdep_count_dependencies __P((struct buf *bp, int));
|
|
|
|
struct bio_ops bioops = {
|
|
softdep_disk_io_initiation, /* io_start */
|
|
softdep_disk_write_complete, /* io_complete */
|
|
softdep_deallocate_dependencies, /* io_deallocate */
|
|
softdep_fsync, /* io_fsync */
|
|
softdep_process_worklist, /* io_sync */
|
|
softdep_move_dependencies, /* io_movedeps */
|
|
softdep_count_dependencies, /* io_countdeps */
|
|
};
|
|
|
|
/*
|
|
* Locking primitives.
|
|
*
|
|
* For a uniprocessor, all we need to do is protect against disk
|
|
* interrupts. For a multiprocessor, this lock would have to be
|
|
* a mutex. A single mutex is used throughout this file, though
|
|
* finer grain locking could be used if contention warranted it.
|
|
*
|
|
* For a multiprocessor, the sleep call would accept a lock and
|
|
* release it after the sleep processing was complete. In a uniprocessor
|
|
* implementation there is no such interlock, so we simple mark
|
|
* the places where it needs to be done with the `interlocked' form
|
|
* of the lock calls. Since the uniprocessor sleep already interlocks
|
|
* the spl, there is nothing that really needs to be done.
|
|
*/
|
|
#ifndef /* NOT */ DEBUG
|
|
static struct lockit {
|
|
int lkt_spl;
|
|
} lk = { 0 };
|
|
#define ACQUIRE_LOCK(lk) (lk)->lkt_spl = splbio()
|
|
#define FREE_LOCK(lk) splx((lk)->lkt_spl)
|
|
#define ACQUIRE_LOCK_INTERLOCKED(lk)
|
|
#define FREE_LOCK_INTERLOCKED(lk)
|
|
|
|
#else /* DEBUG */
|
|
static struct lockit {
|
|
int lkt_spl;
|
|
pid_t lkt_held;
|
|
} lk = { 0, -1 };
|
|
static int lockcnt;
|
|
|
|
static void acquire_lock __P((struct lockit *));
|
|
static void free_lock __P((struct lockit *));
|
|
static void acquire_lock_interlocked __P((struct lockit *));
|
|
static void free_lock_interlocked __P((struct lockit *));
|
|
|
|
#define ACQUIRE_LOCK(lk) acquire_lock(lk)
|
|
#define FREE_LOCK(lk) free_lock(lk)
|
|
#define ACQUIRE_LOCK_INTERLOCKED(lk) acquire_lock_interlocked(lk)
|
|
#define FREE_LOCK_INTERLOCKED(lk) free_lock_interlocked(lk)
|
|
|
|
static void
|
|
acquire_lock(lk)
|
|
struct lockit *lk;
|
|
{
|
|
|
|
if (lk->lkt_held != -1) {
|
|
if (lk->lkt_held == CURPROC->p_pid)
|
|
panic("softdep_lock: locking against myself");
|
|
else
|
|
panic("softdep_lock: lock held by %d", lk->lkt_held);
|
|
}
|
|
lk->lkt_spl = splbio();
|
|
lk->lkt_held = CURPROC->p_pid;
|
|
lockcnt++;
|
|
}
|
|
|
|
static void
|
|
free_lock(lk)
|
|
struct lockit *lk;
|
|
{
|
|
|
|
if (lk->lkt_held == -1)
|
|
panic("softdep_unlock: lock not held");
|
|
lk->lkt_held = -1;
|
|
splx(lk->lkt_spl);
|
|
}
|
|
|
|
static void
|
|
acquire_lock_interlocked(lk)
|
|
struct lockit *lk;
|
|
{
|
|
|
|
if (lk->lkt_held != -1) {
|
|
if (lk->lkt_held == CURPROC->p_pid)
|
|
panic("softdep_lock_interlocked: locking against self");
|
|
else
|
|
panic("softdep_lock_interlocked: lock held by %d",
|
|
lk->lkt_held);
|
|
}
|
|
lk->lkt_held = CURPROC->p_pid;
|
|
lockcnt++;
|
|
}
|
|
|
|
static void
|
|
free_lock_interlocked(lk)
|
|
struct lockit *lk;
|
|
{
|
|
|
|
if (lk->lkt_held == -1)
|
|
panic("softdep_unlock_interlocked: lock not held");
|
|
lk->lkt_held = -1;
|
|
}
|
|
#endif /* DEBUG */
|
|
|
|
/*
|
|
* Place holder for real semaphores.
|
|
*/
|
|
struct sema {
|
|
int value;
|
|
pid_t holder;
|
|
char *name;
|
|
int prio;
|
|
int timo;
|
|
};
|
|
static void sema_init __P((struct sema *, char *, int, int));
|
|
static int sema_get __P((struct sema *, struct lockit *));
|
|
static void sema_release __P((struct sema *));
|
|
|
|
static void
|
|
sema_init(semap, name, prio, timo)
|
|
struct sema *semap;
|
|
char *name;
|
|
int prio, timo;
|
|
{
|
|
|
|
semap->holder = -1;
|
|
semap->value = 0;
|
|
semap->name = name;
|
|
semap->prio = prio;
|
|
semap->timo = timo;
|
|
}
|
|
|
|
static int
|
|
sema_get(semap, interlock)
|
|
struct sema *semap;
|
|
struct lockit *interlock;
|
|
{
|
|
|
|
if (semap->value++ > 0) {
|
|
if (interlock != NULL)
|
|
FREE_LOCK_INTERLOCKED(interlock);
|
|
tsleep((caddr_t)semap, semap->prio, semap->name, semap->timo);
|
|
if (interlock != NULL) {
|
|
ACQUIRE_LOCK_INTERLOCKED(interlock);
|
|
FREE_LOCK(interlock);
|
|
}
|
|
return (0);
|
|
}
|
|
semap->holder = CURPROC->p_pid;
|
|
if (interlock != NULL)
|
|
FREE_LOCK(interlock);
|
|
return (1);
|
|
}
|
|
|
|
static void
|
|
sema_release(semap)
|
|
struct sema *semap;
|
|
{
|
|
|
|
if (semap->value <= 0 || semap->holder != CURPROC->p_pid)
|
|
panic("sema_release: not held");
|
|
if (--semap->value > 0) {
|
|
semap->value = 0;
|
|
wakeup(semap);
|
|
}
|
|
semap->holder = -1;
|
|
}
|
|
|
|
/*
|
|
* Worklist queue management.
|
|
* These routines require that the lock be held.
|
|
*/
|
|
#ifndef /* NOT */ DEBUG
|
|
#define WORKLIST_INSERT(head, item) do { \
|
|
(item)->wk_state |= ONWORKLIST; \
|
|
LIST_INSERT_HEAD(head, item, wk_list); \
|
|
} while (0)
|
|
#define WORKLIST_REMOVE(item) do { \
|
|
(item)->wk_state &= ~ONWORKLIST; \
|
|
LIST_REMOVE(item, wk_list); \
|
|
} while (0)
|
|
#define WORKITEM_FREE(item, type) FREE(item, DtoM(type))
|
|
|
|
#else /* DEBUG */
|
|
static void worklist_insert __P((struct workhead *, struct worklist *));
|
|
static void worklist_remove __P((struct worklist *));
|
|
static void workitem_free __P((struct worklist *, int));
|
|
|
|
#define WORKLIST_INSERT(head, item) worklist_insert(head, item)
|
|
#define WORKLIST_REMOVE(item) worklist_remove(item)
|
|
#define WORKITEM_FREE(item, type) workitem_free((struct worklist *)item, type)
|
|
|
|
static void
|
|
worklist_insert(head, item)
|
|
struct workhead *head;
|
|
struct worklist *item;
|
|
{
|
|
|
|
if (lk.lkt_held == -1)
|
|
panic("worklist_insert: lock not held");
|
|
if (item->wk_state & ONWORKLIST)
|
|
panic("worklist_insert: already on list");
|
|
item->wk_state |= ONWORKLIST;
|
|
LIST_INSERT_HEAD(head, item, wk_list);
|
|
}
|
|
|
|
static void
|
|
worklist_remove(item)
|
|
struct worklist *item;
|
|
{
|
|
|
|
if (lk.lkt_held == -1)
|
|
panic("worklist_remove: lock not held");
|
|
if ((item->wk_state & ONWORKLIST) == 0)
|
|
panic("worklist_remove: not on list");
|
|
item->wk_state &= ~ONWORKLIST;
|
|
LIST_REMOVE(item, wk_list);
|
|
}
|
|
|
|
static void
|
|
workitem_free(item, type)
|
|
struct worklist *item;
|
|
int type;
|
|
{
|
|
|
|
if (item->wk_state & ONWORKLIST)
|
|
panic("workitem_free: still on list");
|
|
if (item->wk_type != type)
|
|
panic("workitem_free: type mismatch");
|
|
FREE(item, DtoM(type));
|
|
}
|
|
#endif /* DEBUG */
|
|
|
|
/*
|
|
* Workitem queue management
|
|
*/
|
|
static struct workhead softdep_workitem_pending;
|
|
static int softdep_worklist_busy;
|
|
static int max_softdeps; /* maximum number of structs before slowdown */
|
|
static int tickdelay = 2; /* number of ticks to pause during slowdown */
|
|
static int proc_waiting; /* tracks whether we have a timeout posted */
|
|
static struct proc *filesys_syncer; /* proc of filesystem syncer process */
|
|
static int req_clear_inodedeps; /* syncer process flush some inodedeps */
|
|
#define FLUSH_INODES 1
|
|
static int req_clear_remove; /* syncer process flush some freeblks */
|
|
#define FLUSH_REMOVE 2
|
|
/*
|
|
* runtime statistics
|
|
*/
|
|
static int stat_blk_limit_push; /* number of times block limit neared */
|
|
static int stat_ino_limit_push; /* number of times inode limit neared */
|
|
static int stat_blk_limit_hit; /* number of times block slowdown imposed */
|
|
static int stat_ino_limit_hit; /* number of times inode slowdown imposed */
|
|
static int stat_indir_blk_ptrs; /* bufs redirtied as indir ptrs not written */
|
|
static int stat_inode_bitmap; /* bufs redirtied as inode bitmap not written */
|
|
static int stat_direct_blk_ptrs;/* bufs redirtied as direct ptrs not written */
|
|
static int stat_dir_entry; /* bufs redirtied as dir entry cannot write */
|
|
#ifdef DEBUG
|
|
#include <vm/vm.h>
|
|
#include <sys/sysctl.h>
|
|
SYSCTL_INT(_debug, OID_AUTO, max_softdeps, CTLFLAG_RW, &max_softdeps, 0, "");
|
|
SYSCTL_INT(_debug, OID_AUTO, tickdelay, CTLFLAG_RW, &tickdelay, 0, "");
|
|
SYSCTL_INT(_debug, OID_AUTO, blk_limit_push, CTLFLAG_RW, &stat_blk_limit_push, 0,"");
|
|
SYSCTL_INT(_debug, OID_AUTO, ino_limit_push, CTLFLAG_RW, &stat_ino_limit_push, 0,"");
|
|
SYSCTL_INT(_debug, OID_AUTO, blk_limit_hit, CTLFLAG_RW, &stat_blk_limit_hit, 0, "");
|
|
SYSCTL_INT(_debug, OID_AUTO, ino_limit_hit, CTLFLAG_RW, &stat_ino_limit_hit, 0, "");
|
|
SYSCTL_INT(_debug, OID_AUTO, indir_blk_ptrs, CTLFLAG_RW, &stat_indir_blk_ptrs, 0, "");
|
|
SYSCTL_INT(_debug, OID_AUTO, inode_bitmap, CTLFLAG_RW, &stat_inode_bitmap, 0, "");
|
|
SYSCTL_INT(_debug, OID_AUTO, direct_blk_ptrs, CTLFLAG_RW, &stat_direct_blk_ptrs, 0, "");
|
|
SYSCTL_INT(_debug, OID_AUTO, dir_entry, CTLFLAG_RW, &stat_dir_entry, 0, "");
|
|
#endif /* DEBUG */
|
|
|
|
/*
|
|
* Add an item to the end of the work queue.
|
|
* This routine requires that the lock be held.
|
|
* This is the only routine that adds items to the list.
|
|
* The following routine is the only one that removes items
|
|
* and does so in order from first to last.
|
|
*/
|
|
static void
|
|
add_to_worklist(wk)
|
|
struct worklist *wk;
|
|
{
|
|
static struct worklist *worklist_tail;
|
|
|
|
if (wk->wk_state & ONWORKLIST)
|
|
panic("add_to_worklist: already on list");
|
|
wk->wk_state |= ONWORKLIST;
|
|
if (LIST_FIRST(&softdep_workitem_pending) == NULL)
|
|
LIST_INSERT_HEAD(&softdep_workitem_pending, wk, wk_list);
|
|
else
|
|
LIST_INSERT_AFTER(worklist_tail, wk, wk_list);
|
|
worklist_tail = wk;
|
|
}
|
|
|
|
/*
|
|
* Process that runs once per second to handle items in the background queue.
|
|
*
|
|
* Note that we ensure that everything is done in the order in which they
|
|
* appear in the queue. The code below depends on this property to ensure
|
|
* that blocks of a file are freed before the inode itself is freed. This
|
|
* ordering ensures that no new <vfsid, inum, lbn> triples will be generated
|
|
* until all the old ones have been purged from the dependency lists.
|
|
*/
|
|
static int
|
|
softdep_process_worklist(matchmnt)
|
|
struct mount *matchmnt;
|
|
{
|
|
struct proc *p = CURPROC;
|
|
struct worklist *wk;
|
|
struct fs *matchfs;
|
|
int matchcnt, loopcount;
|
|
|
|
/*
|
|
* Record the process identifier of our caller so that we can give
|
|
* this process preferential treatment in request_cleanup below.
|
|
*/
|
|
filesys_syncer = p;
|
|
matchcnt = 0;
|
|
matchfs = NULL;
|
|
if (matchmnt != NULL)
|
|
matchfs = VFSTOUFS(matchmnt)->um_fs;
|
|
/*
|
|
* There is no danger of having multiple processes run this
|
|
* code. It is single threaded solely so that softdep_flushfiles
|
|
* (below) can get an accurate count of the number of items
|
|
* related to its mount point that are in the list.
|
|
*/
|
|
if (softdep_worklist_busy && matchmnt == NULL)
|
|
return (-1);
|
|
/*
|
|
* If requested, try removing inode or removal dependencies.
|
|
*/
|
|
if (req_clear_inodedeps) {
|
|
clear_inodedeps(p);
|
|
req_clear_inodedeps = 0;
|
|
wakeup(&proc_waiting);
|
|
}
|
|
if (req_clear_remove) {
|
|
clear_remove(p);
|
|
req_clear_remove = 0;
|
|
wakeup(&proc_waiting);
|
|
}
|
|
ACQUIRE_LOCK(&lk);
|
|
loopcount = 1;
|
|
while ((wk = LIST_FIRST(&softdep_workitem_pending)) != 0) {
|
|
WORKLIST_REMOVE(wk);
|
|
FREE_LOCK(&lk);
|
|
switch (wk->wk_type) {
|
|
|
|
case D_DIRREM:
|
|
/* removal of a directory entry */
|
|
if (WK_DIRREM(wk)->dm_mnt == matchmnt)
|
|
matchcnt += 1;
|
|
handle_workitem_remove(WK_DIRREM(wk));
|
|
break;
|
|
|
|
case D_FREEBLKS:
|
|
/* releasing blocks and/or fragments from a file */
|
|
if (WK_FREEBLKS(wk)->fb_fs == matchfs)
|
|
matchcnt += 1;
|
|
handle_workitem_freeblocks(WK_FREEBLKS(wk));
|
|
break;
|
|
|
|
case D_FREEFRAG:
|
|
/* releasing a fragment when replaced as a file grows */
|
|
if (WK_FREEFRAG(wk)->ff_fs == matchfs)
|
|
matchcnt += 1;
|
|
handle_workitem_freefrag(WK_FREEFRAG(wk));
|
|
break;
|
|
|
|
case D_FREEFILE:
|
|
/* releasing an inode when its link count drops to 0 */
|
|
if (WK_FREEFILE(wk)->fx_fs == matchfs)
|
|
matchcnt += 1;
|
|
handle_workitem_freefile(WK_FREEFILE(wk));
|
|
break;
|
|
|
|
default:
|
|
panic("%s_process_worklist: Unknown type %s",
|
|
"softdep", TYPENAME(wk->wk_type));
|
|
/* NOTREACHED */
|
|
}
|
|
if (softdep_worklist_busy && matchmnt == NULL)
|
|
return (-1);
|
|
/*
|
|
* If requested, try removing inode or removal dependencies.
|
|
*/
|
|
if (req_clear_inodedeps) {
|
|
clear_inodedeps(p);
|
|
req_clear_inodedeps = 0;
|
|
wakeup(&proc_waiting);
|
|
}
|
|
if (req_clear_remove) {
|
|
clear_remove(p);
|
|
req_clear_remove = 0;
|
|
wakeup(&proc_waiting);
|
|
}
|
|
/*
|
|
* We do not generally want to stop for buffer space, but if
|
|
* we are really being a buffer hog, we will stop and wait.
|
|
*/
|
|
if (loopcount++ % 128 == 0)
|
|
bwillwrite();
|
|
ACQUIRE_LOCK(&lk);
|
|
}
|
|
FREE_LOCK(&lk);
|
|
return (matchcnt);
|
|
}
|
|
|
|
/*
|
|
* Move dependencies from one buffer to another.
|
|
*/
|
|
static void
|
|
softdep_move_dependencies(oldbp, newbp)
|
|
struct buf *oldbp;
|
|
struct buf *newbp;
|
|
{
|
|
struct worklist *wk, *wktail;
|
|
|
|
if (LIST_FIRST(&newbp->b_dep) != NULL)
|
|
panic("softdep_move_dependencies: need merge code");
|
|
wktail = 0;
|
|
ACQUIRE_LOCK(&lk);
|
|
while ((wk = LIST_FIRST(&oldbp->b_dep)) != NULL) {
|
|
LIST_REMOVE(wk, wk_list);
|
|
if (wktail == 0)
|
|
LIST_INSERT_HEAD(&newbp->b_dep, wk, wk_list);
|
|
else
|
|
LIST_INSERT_AFTER(wktail, wk, wk_list);
|
|
wktail = wk;
|
|
}
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* Purge the work list of all items associated with a particular mount point.
|
|
*/
|
|
int
|
|
softdep_flushfiles(oldmnt, flags, p)
|
|
struct mount *oldmnt;
|
|
int flags;
|
|
struct proc *p;
|
|
{
|
|
struct vnode *devvp;
|
|
int error, loopcnt;
|
|
|
|
/*
|
|
* Await our turn to clear out the queue.
|
|
*/
|
|
while (softdep_worklist_busy)
|
|
tsleep(&lbolt, PRIBIO, "softflush", 0);
|
|
softdep_worklist_busy = 1;
|
|
if ((error = ffs_flushfiles(oldmnt, flags, p)) != 0) {
|
|
softdep_worklist_busy = 0;
|
|
return (error);
|
|
}
|
|
/*
|
|
* Alternately flush the block device associated with the mount
|
|
* point and process any dependencies that the flushing
|
|
* creates. In theory, this loop can happen at most twice,
|
|
* but we give it a few extra just to be sure.
|
|
*/
|
|
devvp = VFSTOUFS(oldmnt)->um_devvp;
|
|
for (loopcnt = 10; loopcnt > 0; ) {
|
|
if (softdep_process_worklist(oldmnt) == 0) {
|
|
loopcnt--;
|
|
/*
|
|
* Do another flush in case any vnodes were brought in
|
|
* as part of the cleanup operations.
|
|
*/
|
|
if ((error = ffs_flushfiles(oldmnt, flags, p)) != 0)
|
|
break;
|
|
/*
|
|
* If we still found nothing to do, we are really done.
|
|
*/
|
|
if (softdep_process_worklist(oldmnt) == 0)
|
|
break;
|
|
}
|
|
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
|
|
error = VOP_FSYNC(devvp, p->p_ucred, MNT_WAIT, p);
|
|
VOP_UNLOCK(devvp, 0, p);
|
|
if (error)
|
|
break;
|
|
}
|
|
softdep_worklist_busy = 0;
|
|
/*
|
|
* If we are unmounting then it is an error to fail. If we
|
|
* are simply trying to downgrade to read-only, then filesystem
|
|
* activity can keep us busy forever, so we just fail with EBUSY.
|
|
*/
|
|
if (loopcnt == 0) {
|
|
if (oldmnt->mnt_kern_flag & MNTK_UNMOUNT)
|
|
panic("softdep_flushfiles: looping");
|
|
error = EBUSY;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Structure hashing.
|
|
*
|
|
* There are three types of structures that can be looked up:
|
|
* 1) pagedep structures identified by mount point, inode number,
|
|
* and logical block.
|
|
* 2) inodedep structures identified by mount point and inode number.
|
|
* 3) newblk structures identified by mount point and
|
|
* physical block number.
|
|
*
|
|
* The "pagedep" and "inodedep" dependency structures are hashed
|
|
* separately from the file blocks and inodes to which they correspond.
|
|
* This separation helps when the in-memory copy of an inode or
|
|
* file block must be replaced. It also obviates the need to access
|
|
* an inode or file page when simply updating (or de-allocating)
|
|
* dependency structures. Lookup of newblk structures is needed to
|
|
* find newly allocated blocks when trying to associate them with
|
|
* their allocdirect or allocindir structure.
|
|
*
|
|
* The lookup routines optionally create and hash a new instance when
|
|
* an existing entry is not found.
|
|
*/
|
|
#define DEPALLOC 0x0001 /* allocate structure if lookup fails */
|
|
|
|
/*
|
|
* Structures and routines associated with pagedep caching.
|
|
*/
|
|
LIST_HEAD(pagedep_hashhead, pagedep) *pagedep_hashtbl;
|
|
u_long pagedep_hash; /* size of hash table - 1 */
|
|
#define PAGEDEP_HASH(mp, inum, lbn) \
|
|
(&pagedep_hashtbl[((((register_t)(mp)) >> 13) + (inum) + (lbn)) & \
|
|
pagedep_hash])
|
|
static struct sema pagedep_in_progress;
|
|
|
|
/*
|
|
* Look up a pagedep. Return 1 if found, 0 if not found.
|
|
* If not found, allocate if DEPALLOC flag is passed.
|
|
* Found or allocated entry is returned in pagedeppp.
|
|
* This routine must be called with splbio interrupts blocked.
|
|
*/
|
|
static int
|
|
pagedep_lookup(ip, lbn, flags, pagedeppp)
|
|
struct inode *ip;
|
|
ufs_lbn_t lbn;
|
|
int flags;
|
|
struct pagedep **pagedeppp;
|
|
{
|
|
struct pagedep *pagedep;
|
|
struct pagedep_hashhead *pagedephd;
|
|
struct mount *mp;
|
|
int i;
|
|
|
|
#ifdef DEBUG
|
|
if (lk.lkt_held == -1)
|
|
panic("pagedep_lookup: lock not held");
|
|
#endif
|
|
mp = ITOV(ip)->v_mount;
|
|
pagedephd = PAGEDEP_HASH(mp, ip->i_number, lbn);
|
|
top:
|
|
for (pagedep = LIST_FIRST(pagedephd); pagedep;
|
|
pagedep = LIST_NEXT(pagedep, pd_hash))
|
|
if (ip->i_number == pagedep->pd_ino &&
|
|
lbn == pagedep->pd_lbn &&
|
|
mp == pagedep->pd_mnt)
|
|
break;
|
|
if (pagedep) {
|
|
*pagedeppp = pagedep;
|
|
return (1);
|
|
}
|
|
if ((flags & DEPALLOC) == 0) {
|
|
*pagedeppp = NULL;
|
|
return (0);
|
|
}
|
|
if (sema_get(&pagedep_in_progress, &lk) == 0) {
|
|
ACQUIRE_LOCK(&lk);
|
|
goto top;
|
|
}
|
|
MALLOC(pagedep, struct pagedep *, sizeof(struct pagedep), M_PAGEDEP,
|
|
M_WAITOK);
|
|
bzero(pagedep, sizeof(struct pagedep));
|
|
pagedep->pd_list.wk_type = D_PAGEDEP;
|
|
pagedep->pd_mnt = mp;
|
|
pagedep->pd_ino = ip->i_number;
|
|
pagedep->pd_lbn = lbn;
|
|
LIST_INIT(&pagedep->pd_dirremhd);
|
|
LIST_INIT(&pagedep->pd_pendinghd);
|
|
for (i = 0; i < DAHASHSZ; i++)
|
|
LIST_INIT(&pagedep->pd_diraddhd[i]);
|
|
ACQUIRE_LOCK(&lk);
|
|
LIST_INSERT_HEAD(pagedephd, pagedep, pd_hash);
|
|
sema_release(&pagedep_in_progress);
|
|
*pagedeppp = pagedep;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Structures and routines associated with inodedep caching.
|
|
*/
|
|
LIST_HEAD(inodedep_hashhead, inodedep) *inodedep_hashtbl;
|
|
static u_long inodedep_hash; /* size of hash table - 1 */
|
|
static long num_inodedep; /* number of inodedep allocated */
|
|
#define INODEDEP_HASH(fs, inum) \
|
|
(&inodedep_hashtbl[((((register_t)(fs)) >> 13) + (inum)) & inodedep_hash])
|
|
static struct sema inodedep_in_progress;
|
|
|
|
/*
|
|
* Look up a inodedep. Return 1 if found, 0 if not found.
|
|
* If not found, allocate if DEPALLOC flag is passed.
|
|
* Found or allocated entry is returned in inodedeppp.
|
|
* This routine must be called with splbio interrupts blocked.
|
|
*/
|
|
static int
|
|
inodedep_lookup(fs, inum, flags, inodedeppp)
|
|
struct fs *fs;
|
|
ino_t inum;
|
|
int flags;
|
|
struct inodedep **inodedeppp;
|
|
{
|
|
struct inodedep *inodedep;
|
|
struct inodedep_hashhead *inodedephd;
|
|
int firsttry;
|
|
|
|
#ifdef DEBUG
|
|
if (lk.lkt_held == -1)
|
|
panic("inodedep_lookup: lock not held");
|
|
#endif
|
|
firsttry = 1;
|
|
inodedephd = INODEDEP_HASH(fs, inum);
|
|
top:
|
|
for (inodedep = LIST_FIRST(inodedephd); inodedep;
|
|
inodedep = LIST_NEXT(inodedep, id_hash))
|
|
if (inum == inodedep->id_ino && fs == inodedep->id_fs)
|
|
break;
|
|
if (inodedep) {
|
|
*inodedeppp = inodedep;
|
|
return (1);
|
|
}
|
|
if ((flags & DEPALLOC) == 0) {
|
|
*inodedeppp = NULL;
|
|
return (0);
|
|
}
|
|
/*
|
|
* If we are over our limit, try to improve the situation.
|
|
*/
|
|
if (num_inodedep > max_softdeps && firsttry && speedup_syncer() == 0 &&
|
|
request_cleanup(FLUSH_INODES, 1)) {
|
|
firsttry = 0;
|
|
goto top;
|
|
}
|
|
if (sema_get(&inodedep_in_progress, &lk) == 0) {
|
|
ACQUIRE_LOCK(&lk);
|
|
goto top;
|
|
}
|
|
num_inodedep += 1;
|
|
MALLOC(inodedep, struct inodedep *, sizeof(struct inodedep),
|
|
M_INODEDEP, M_WAITOK);
|
|
inodedep->id_list.wk_type = D_INODEDEP;
|
|
inodedep->id_fs = fs;
|
|
inodedep->id_ino = inum;
|
|
inodedep->id_state = ALLCOMPLETE;
|
|
inodedep->id_nlinkdelta = 0;
|
|
inodedep->id_savedino = NULL;
|
|
inodedep->id_savedsize = -1;
|
|
inodedep->id_buf = NULL;
|
|
LIST_INIT(&inodedep->id_pendinghd);
|
|
LIST_INIT(&inodedep->id_inowait);
|
|
LIST_INIT(&inodedep->id_bufwait);
|
|
TAILQ_INIT(&inodedep->id_inoupdt);
|
|
TAILQ_INIT(&inodedep->id_newinoupdt);
|
|
ACQUIRE_LOCK(&lk);
|
|
LIST_INSERT_HEAD(inodedephd, inodedep, id_hash);
|
|
sema_release(&inodedep_in_progress);
|
|
*inodedeppp = inodedep;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Structures and routines associated with newblk caching.
|
|
*/
|
|
LIST_HEAD(newblk_hashhead, newblk) *newblk_hashtbl;
|
|
u_long newblk_hash; /* size of hash table - 1 */
|
|
#define NEWBLK_HASH(fs, inum) \
|
|
(&newblk_hashtbl[((((register_t)(fs)) >> 13) + (inum)) & newblk_hash])
|
|
static struct sema newblk_in_progress;
|
|
|
|
/*
|
|
* Look up a newblk. Return 1 if found, 0 if not found.
|
|
* If not found, allocate if DEPALLOC flag is passed.
|
|
* Found or allocated entry is returned in newblkpp.
|
|
*/
|
|
static int
|
|
newblk_lookup(fs, newblkno, flags, newblkpp)
|
|
struct fs *fs;
|
|
ufs_daddr_t newblkno;
|
|
int flags;
|
|
struct newblk **newblkpp;
|
|
{
|
|
struct newblk *newblk;
|
|
struct newblk_hashhead *newblkhd;
|
|
|
|
newblkhd = NEWBLK_HASH(fs, newblkno);
|
|
top:
|
|
for (newblk = LIST_FIRST(newblkhd); newblk;
|
|
newblk = LIST_NEXT(newblk, nb_hash))
|
|
if (newblkno == newblk->nb_newblkno && fs == newblk->nb_fs)
|
|
break;
|
|
if (newblk) {
|
|
*newblkpp = newblk;
|
|
return (1);
|
|
}
|
|
if ((flags & DEPALLOC) == 0) {
|
|
*newblkpp = NULL;
|
|
return (0);
|
|
}
|
|
if (sema_get(&newblk_in_progress, 0) == 0)
|
|
goto top;
|
|
MALLOC(newblk, struct newblk *, sizeof(struct newblk),
|
|
M_NEWBLK, M_WAITOK);
|
|
newblk->nb_state = 0;
|
|
newblk->nb_fs = fs;
|
|
newblk->nb_newblkno = newblkno;
|
|
LIST_INSERT_HEAD(newblkhd, newblk, nb_hash);
|
|
sema_release(&newblk_in_progress);
|
|
*newblkpp = newblk;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Executed during filesystem system initialization before
|
|
* mounting any file systems.
|
|
*/
|
|
void
|
|
softdep_initialize()
|
|
{
|
|
|
|
LIST_INIT(&mkdirlisthd);
|
|
LIST_INIT(&softdep_workitem_pending);
|
|
max_softdeps = desiredvnodes * 8;
|
|
pagedep_hashtbl = hashinit(desiredvnodes / 5, M_PAGEDEP,
|
|
&pagedep_hash);
|
|
sema_init(&pagedep_in_progress, "pagedep", PRIBIO, 0);
|
|
inodedep_hashtbl = hashinit(desiredvnodes, M_INODEDEP, &inodedep_hash);
|
|
sema_init(&inodedep_in_progress, "inodedep", PRIBIO, 0);
|
|
newblk_hashtbl = hashinit(64, M_NEWBLK, &newblk_hash);
|
|
sema_init(&newblk_in_progress, "newblk", PRIBIO, 0);
|
|
}
|
|
|
|
/*
|
|
* Called at mount time to notify the dependency code that a
|
|
* filesystem wishes to use it.
|
|
*/
|
|
int
|
|
softdep_mount(devvp, mp, fs, cred)
|
|
struct vnode *devvp;
|
|
struct mount *mp;
|
|
struct fs *fs;
|
|
struct ucred *cred;
|
|
{
|
|
struct csum cstotal;
|
|
struct cg *cgp;
|
|
struct buf *bp;
|
|
int error, cyl;
|
|
|
|
mp->mnt_flag &= ~MNT_ASYNC;
|
|
mp->mnt_flag |= MNT_SOFTDEP;
|
|
/*
|
|
* When doing soft updates, the counters in the
|
|
* superblock may have gotten out of sync, so we have
|
|
* to scan the cylinder groups and recalculate them.
|
|
*/
|
|
if (fs->fs_clean != 0)
|
|
return (0);
|
|
bzero(&cstotal, sizeof cstotal);
|
|
for (cyl = 0; cyl < fs->fs_ncg; cyl++) {
|
|
if ((error = bread(devvp, fsbtodb(fs, cgtod(fs, cyl)),
|
|
fs->fs_cgsize, cred, &bp)) != 0) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
cgp = (struct cg *)bp->b_data;
|
|
cstotal.cs_nffree += cgp->cg_cs.cs_nffree;
|
|
cstotal.cs_nbfree += cgp->cg_cs.cs_nbfree;
|
|
cstotal.cs_nifree += cgp->cg_cs.cs_nifree;
|
|
cstotal.cs_ndir += cgp->cg_cs.cs_ndir;
|
|
fs->fs_cs(fs, cyl) = cgp->cg_cs;
|
|
brelse(bp);
|
|
}
|
|
#ifdef DEBUG
|
|
if (bcmp(&cstotal, &fs->fs_cstotal, sizeof cstotal))
|
|
printf("ffs_mountfs: superblock updated for soft updates\n");
|
|
#endif
|
|
bcopy(&cstotal, &fs->fs_cstotal, sizeof cstotal);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Protecting the freemaps (or bitmaps).
|
|
*
|
|
* To eliminate the need to execute fsck before mounting a file system
|
|
* after a power failure, one must (conservatively) guarantee that the
|
|
* on-disk copy of the bitmaps never indicate that a live inode or block is
|
|
* free. So, when a block or inode is allocated, the bitmap should be
|
|
* updated (on disk) before any new pointers. When a block or inode is
|
|
* freed, the bitmap should not be updated until all pointers have been
|
|
* reset. The latter dependency is handled by the delayed de-allocation
|
|
* approach described below for block and inode de-allocation. The former
|
|
* dependency is handled by calling the following procedure when a block or
|
|
* inode is allocated. When an inode is allocated an "inodedep" is created
|
|
* with its DEPCOMPLETE flag cleared until its bitmap is written to disk.
|
|
* Each "inodedep" is also inserted into the hash indexing structure so
|
|
* that any additional link additions can be made dependent on the inode
|
|
* allocation.
|
|
*
|
|
* The ufs file system maintains a number of free block counts (e.g., per
|
|
* cylinder group, per cylinder and per <cylinder, rotational position> pair)
|
|
* in addition to the bitmaps. These counts are used to improve efficiency
|
|
* during allocation and therefore must be consistent with the bitmaps.
|
|
* There is no convenient way to guarantee post-crash consistency of these
|
|
* counts with simple update ordering, for two main reasons: (1) The counts
|
|
* and bitmaps for a single cylinder group block are not in the same disk
|
|
* sector. If a disk write is interrupted (e.g., by power failure), one may
|
|
* be written and the other not. (2) Some of the counts are located in the
|
|
* superblock rather than the cylinder group block. So, we focus our soft
|
|
* updates implementation on protecting the bitmaps. When mounting a
|
|
* filesystem, we recompute the auxiliary counts from the bitmaps.
|
|
*/
|
|
|
|
/*
|
|
* Called just after updating the cylinder group block to allocate an inode.
|
|
*/
|
|
void
|
|
softdep_setup_inomapdep(bp, ip, newinum)
|
|
struct buf *bp; /* buffer for cylgroup block with inode map */
|
|
struct inode *ip; /* inode related to allocation */
|
|
ino_t newinum; /* new inode number being allocated */
|
|
{
|
|
struct inodedep *inodedep;
|
|
struct bmsafemap *bmsafemap;
|
|
|
|
/*
|
|
* Create a dependency for the newly allocated inode.
|
|
* Panic if it already exists as something is seriously wrong.
|
|
* Otherwise add it to the dependency list for the buffer holding
|
|
* the cylinder group map from which it was allocated.
|
|
*/
|
|
ACQUIRE_LOCK(&lk);
|
|
if (inodedep_lookup(ip->i_fs, newinum, DEPALLOC, &inodedep) != 0)
|
|
panic("softdep_setup_inomapdep: found inode");
|
|
inodedep->id_buf = bp;
|
|
inodedep->id_state &= ~DEPCOMPLETE;
|
|
bmsafemap = bmsafemap_lookup(bp);
|
|
LIST_INSERT_HEAD(&bmsafemap->sm_inodedephd, inodedep, id_deps);
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* Called just after updating the cylinder group block to
|
|
* allocate block or fragment.
|
|
*/
|
|
void
|
|
softdep_setup_blkmapdep(bp, fs, newblkno)
|
|
struct buf *bp; /* buffer for cylgroup block with block map */
|
|
struct fs *fs; /* filesystem doing allocation */
|
|
ufs_daddr_t newblkno; /* number of newly allocated block */
|
|
{
|
|
struct newblk *newblk;
|
|
struct bmsafemap *bmsafemap;
|
|
|
|
/*
|
|
* Create a dependency for the newly allocated block.
|
|
* Add it to the dependency list for the buffer holding
|
|
* the cylinder group map from which it was allocated.
|
|
*/
|
|
if (newblk_lookup(fs, newblkno, DEPALLOC, &newblk) != 0)
|
|
panic("softdep_setup_blkmapdep: found block");
|
|
ACQUIRE_LOCK(&lk);
|
|
newblk->nb_bmsafemap = bmsafemap = bmsafemap_lookup(bp);
|
|
LIST_INSERT_HEAD(&bmsafemap->sm_newblkhd, newblk, nb_deps);
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* Find the bmsafemap associated with a cylinder group buffer.
|
|
* If none exists, create one. The buffer must be locked when
|
|
* this routine is called and this routine must be called with
|
|
* splbio interrupts blocked.
|
|
*/
|
|
static struct bmsafemap *
|
|
bmsafemap_lookup(bp)
|
|
struct buf *bp;
|
|
{
|
|
struct bmsafemap *bmsafemap;
|
|
struct worklist *wk;
|
|
|
|
#ifdef DEBUG
|
|
if (lk.lkt_held == -1)
|
|
panic("bmsafemap_lookup: lock not held");
|
|
#endif
|
|
for (wk = LIST_FIRST(&bp->b_dep); wk; wk = LIST_NEXT(wk, wk_list))
|
|
if (wk->wk_type == D_BMSAFEMAP)
|
|
return (WK_BMSAFEMAP(wk));
|
|
FREE_LOCK(&lk);
|
|
MALLOC(bmsafemap, struct bmsafemap *, sizeof(struct bmsafemap),
|
|
M_BMSAFEMAP, M_WAITOK);
|
|
bmsafemap->sm_list.wk_type = D_BMSAFEMAP;
|
|
bmsafemap->sm_list.wk_state = 0;
|
|
bmsafemap->sm_buf = bp;
|
|
LIST_INIT(&bmsafemap->sm_allocdirecthd);
|
|
LIST_INIT(&bmsafemap->sm_allocindirhd);
|
|
LIST_INIT(&bmsafemap->sm_inodedephd);
|
|
LIST_INIT(&bmsafemap->sm_newblkhd);
|
|
ACQUIRE_LOCK(&lk);
|
|
WORKLIST_INSERT(&bp->b_dep, &bmsafemap->sm_list);
|
|
return (bmsafemap);
|
|
}
|
|
|
|
/*
|
|
* Direct block allocation dependencies.
|
|
*
|
|
* When a new block is allocated, the corresponding disk locations must be
|
|
* initialized (with zeros or new data) before the on-disk inode points to
|
|
* them. Also, the freemap from which the block was allocated must be
|
|
* updated (on disk) before the inode's pointer. These two dependencies are
|
|
* independent of each other and are needed for all file blocks and indirect
|
|
* blocks that are pointed to directly by the inode. Just before the
|
|
* "in-core" version of the inode is updated with a newly allocated block
|
|
* number, a procedure (below) is called to setup allocation dependency
|
|
* structures. These structures are removed when the corresponding
|
|
* dependencies are satisfied or when the block allocation becomes obsolete
|
|
* (i.e., the file is deleted, the block is de-allocated, or the block is a
|
|
* fragment that gets upgraded). All of these cases are handled in
|
|
* procedures described later.
|
|
*
|
|
* When a file extension causes a fragment to be upgraded, either to a larger
|
|
* fragment or to a full block, the on-disk location may change (if the
|
|
* previous fragment could not simply be extended). In this case, the old
|
|
* fragment must be de-allocated, but not until after the inode's pointer has
|
|
* been updated. In most cases, this is handled by later procedures, which
|
|
* will construct a "freefrag" structure to be added to the workitem queue
|
|
* when the inode update is complete (or obsolete). The main exception to
|
|
* this is when an allocation occurs while a pending allocation dependency
|
|
* (for the same block pointer) remains. This case is handled in the main
|
|
* allocation dependency setup procedure by immediately freeing the
|
|
* unreferenced fragments.
|
|
*/
|
|
void
|
|
softdep_setup_allocdirect(ip, lbn, newblkno, oldblkno, newsize, oldsize, bp)
|
|
struct inode *ip; /* inode to which block is being added */
|
|
ufs_lbn_t lbn; /* block pointer within inode */
|
|
ufs_daddr_t newblkno; /* disk block number being added */
|
|
ufs_daddr_t oldblkno; /* previous block number, 0 unless frag */
|
|
long newsize; /* size of new block */
|
|
long oldsize; /* size of new block */
|
|
struct buf *bp; /* bp for allocated block */
|
|
{
|
|
struct allocdirect *adp, *oldadp;
|
|
struct allocdirectlst *adphead;
|
|
struct bmsafemap *bmsafemap;
|
|
struct inodedep *inodedep;
|
|
struct pagedep *pagedep;
|
|
struct newblk *newblk;
|
|
|
|
MALLOC(adp, struct allocdirect *, sizeof(struct allocdirect),
|
|
M_ALLOCDIRECT, M_WAITOK);
|
|
bzero(adp, sizeof(struct allocdirect));
|
|
adp->ad_list.wk_type = D_ALLOCDIRECT;
|
|
adp->ad_lbn = lbn;
|
|
adp->ad_newblkno = newblkno;
|
|
adp->ad_oldblkno = oldblkno;
|
|
adp->ad_newsize = newsize;
|
|
adp->ad_oldsize = oldsize;
|
|
adp->ad_state = ATTACHED;
|
|
if (newblkno == oldblkno)
|
|
adp->ad_freefrag = NULL;
|
|
else
|
|
adp->ad_freefrag = newfreefrag(ip, oldblkno, oldsize);
|
|
|
|
if (newblk_lookup(ip->i_fs, newblkno, 0, &newblk) == 0)
|
|
panic("softdep_setup_allocdirect: lost block");
|
|
|
|
ACQUIRE_LOCK(&lk);
|
|
(void) inodedep_lookup(ip->i_fs, ip->i_number, DEPALLOC, &inodedep);
|
|
adp->ad_inodedep = inodedep;
|
|
|
|
if (newblk->nb_state == DEPCOMPLETE) {
|
|
adp->ad_state |= DEPCOMPLETE;
|
|
adp->ad_buf = NULL;
|
|
} else {
|
|
bmsafemap = newblk->nb_bmsafemap;
|
|
adp->ad_buf = bmsafemap->sm_buf;
|
|
LIST_REMOVE(newblk, nb_deps);
|
|
LIST_INSERT_HEAD(&bmsafemap->sm_allocdirecthd, adp, ad_deps);
|
|
}
|
|
LIST_REMOVE(newblk, nb_hash);
|
|
FREE(newblk, M_NEWBLK);
|
|
|
|
WORKLIST_INSERT(&bp->b_dep, &adp->ad_list);
|
|
if (lbn >= NDADDR) {
|
|
/* allocating an indirect block */
|
|
if (oldblkno != 0)
|
|
panic("softdep_setup_allocdirect: non-zero indir");
|
|
} else {
|
|
/*
|
|
* Allocating a direct block.
|
|
*
|
|
* If we are allocating a directory block, then we must
|
|
* allocate an associated pagedep to track additions and
|
|
* deletions.
|
|
*/
|
|
if ((ip->i_mode & IFMT) == IFDIR &&
|
|
pagedep_lookup(ip, lbn, DEPALLOC, &pagedep) == 0)
|
|
WORKLIST_INSERT(&bp->b_dep, &pagedep->pd_list);
|
|
}
|
|
/*
|
|
* The list of allocdirects must be kept in sorted and ascending
|
|
* order so that the rollback routines can quickly determine the
|
|
* first uncommitted block (the size of the file stored on disk
|
|
* ends at the end of the lowest committed fragment, or if there
|
|
* are no fragments, at the end of the highest committed block).
|
|
* Since files generally grow, the typical case is that the new
|
|
* block is to be added at the end of the list. We speed this
|
|
* special case by checking against the last allocdirect in the
|
|
* list before laboriously traversing the list looking for the
|
|
* insertion point.
|
|
*/
|
|
adphead = &inodedep->id_newinoupdt;
|
|
oldadp = TAILQ_LAST(adphead, allocdirectlst);
|
|
if (oldadp == NULL || oldadp->ad_lbn <= lbn) {
|
|
/* insert at end of list */
|
|
TAILQ_INSERT_TAIL(adphead, adp, ad_next);
|
|
if (oldadp != NULL && oldadp->ad_lbn == lbn)
|
|
allocdirect_merge(adphead, adp, oldadp);
|
|
FREE_LOCK(&lk);
|
|
return;
|
|
}
|
|
for (oldadp = TAILQ_FIRST(adphead); oldadp;
|
|
oldadp = TAILQ_NEXT(oldadp, ad_next)) {
|
|
if (oldadp->ad_lbn >= lbn)
|
|
break;
|
|
}
|
|
if (oldadp == NULL)
|
|
panic("softdep_setup_allocdirect: lost entry");
|
|
/* insert in middle of list */
|
|
TAILQ_INSERT_BEFORE(oldadp, adp, ad_next);
|
|
if (oldadp->ad_lbn == lbn)
|
|
allocdirect_merge(adphead, adp, oldadp);
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* Replace an old allocdirect dependency with a newer one.
|
|
* This routine must be called with splbio interrupts blocked.
|
|
*/
|
|
static void
|
|
allocdirect_merge(adphead, newadp, oldadp)
|
|
struct allocdirectlst *adphead; /* head of list holding allocdirects */
|
|
struct allocdirect *newadp; /* allocdirect being added */
|
|
struct allocdirect *oldadp; /* existing allocdirect being checked */
|
|
{
|
|
struct freefrag *freefrag;
|
|
|
|
#ifdef DEBUG
|
|
if (lk.lkt_held == -1)
|
|
panic("allocdirect_merge: lock not held");
|
|
#endif
|
|
if (newadp->ad_oldblkno != oldadp->ad_newblkno ||
|
|
newadp->ad_oldsize != oldadp->ad_newsize ||
|
|
newadp->ad_lbn >= NDADDR)
|
|
panic("allocdirect_check: old %d != new %d || lbn %ld >= %d",
|
|
newadp->ad_oldblkno, oldadp->ad_newblkno, newadp->ad_lbn,
|
|
NDADDR);
|
|
newadp->ad_oldblkno = oldadp->ad_oldblkno;
|
|
newadp->ad_oldsize = oldadp->ad_oldsize;
|
|
/*
|
|
* If the old dependency had a fragment to free or had never
|
|
* previously had a block allocated, then the new dependency
|
|
* can immediately post its freefrag and adopt the old freefrag.
|
|
* This action is done by swapping the freefrag dependencies.
|
|
* The new dependency gains the old one's freefrag, and the
|
|
* old one gets the new one and then immediately puts it on
|
|
* the worklist when it is freed by free_allocdirect. It is
|
|
* not possible to do this swap when the old dependency had a
|
|
* non-zero size but no previous fragment to free. This condition
|
|
* arises when the new block is an extension of the old block.
|
|
* Here, the first part of the fragment allocated to the new
|
|
* dependency is part of the block currently claimed on disk by
|
|
* the old dependency, so cannot legitimately be freed until the
|
|
* conditions for the new dependency are fulfilled.
|
|
*/
|
|
if (oldadp->ad_freefrag != NULL || oldadp->ad_oldblkno == 0) {
|
|
freefrag = newadp->ad_freefrag;
|
|
newadp->ad_freefrag = oldadp->ad_freefrag;
|
|
oldadp->ad_freefrag = freefrag;
|
|
}
|
|
free_allocdirect(adphead, oldadp, 0);
|
|
}
|
|
|
|
/*
|
|
* Allocate a new freefrag structure if needed.
|
|
*/
|
|
static struct freefrag *
|
|
newfreefrag(ip, blkno, size)
|
|
struct inode *ip;
|
|
ufs_daddr_t blkno;
|
|
long size;
|
|
{
|
|
struct freefrag *freefrag;
|
|
struct fs *fs;
|
|
|
|
if (blkno == 0)
|
|
return (NULL);
|
|
fs = ip->i_fs;
|
|
if (fragnum(fs, blkno) + numfrags(fs, size) > fs->fs_frag)
|
|
panic("newfreefrag: frag size");
|
|
MALLOC(freefrag, struct freefrag *, sizeof(struct freefrag),
|
|
M_FREEFRAG, M_WAITOK);
|
|
freefrag->ff_list.wk_type = D_FREEFRAG;
|
|
freefrag->ff_state = ip->i_uid & ~ONWORKLIST; /* XXX - used below */
|
|
freefrag->ff_inum = ip->i_number;
|
|
freefrag->ff_fs = fs;
|
|
freefrag->ff_devvp = ip->i_devvp;
|
|
freefrag->ff_blkno = blkno;
|
|
freefrag->ff_fragsize = size;
|
|
return (freefrag);
|
|
}
|
|
|
|
/*
|
|
* This workitem de-allocates fragments that were replaced during
|
|
* file block allocation.
|
|
*/
|
|
static void
|
|
handle_workitem_freefrag(freefrag)
|
|
struct freefrag *freefrag;
|
|
{
|
|
struct inode tip;
|
|
|
|
tip.i_fs = freefrag->ff_fs;
|
|
tip.i_devvp = freefrag->ff_devvp;
|
|
tip.i_dev = freefrag->ff_devvp->v_rdev;
|
|
tip.i_number = freefrag->ff_inum;
|
|
tip.i_uid = freefrag->ff_state & ~ONWORKLIST; /* XXX - set above */
|
|
ffs_blkfree(&tip, freefrag->ff_blkno, freefrag->ff_fragsize);
|
|
FREE(freefrag, M_FREEFRAG);
|
|
}
|
|
|
|
/*
|
|
* Indirect block allocation dependencies.
|
|
*
|
|
* The same dependencies that exist for a direct block also exist when
|
|
* a new block is allocated and pointed to by an entry in a block of
|
|
* indirect pointers. The undo/redo states described above are also
|
|
* used here. Because an indirect block contains many pointers that
|
|
* may have dependencies, a second copy of the entire in-memory indirect
|
|
* block is kept. The buffer cache copy is always completely up-to-date.
|
|
* The second copy, which is used only as a source for disk writes,
|
|
* contains only the safe pointers (i.e., those that have no remaining
|
|
* update dependencies). The second copy is freed when all pointers
|
|
* are safe. The cache is not allowed to replace indirect blocks with
|
|
* pending update dependencies. If a buffer containing an indirect
|
|
* block with dependencies is written, these routines will mark it
|
|
* dirty again. It can only be successfully written once all the
|
|
* dependencies are removed. The ffs_fsync routine in conjunction with
|
|
* softdep_sync_metadata work together to get all the dependencies
|
|
* removed so that a file can be successfully written to disk. Three
|
|
* procedures are used when setting up indirect block pointer
|
|
* dependencies. The division is necessary because of the organization
|
|
* of the "balloc" routine and because of the distinction between file
|
|
* pages and file metadata blocks.
|
|
*/
|
|
|
|
/*
|
|
* Allocate a new allocindir structure.
|
|
*/
|
|
static struct allocindir *
|
|
newallocindir(ip, ptrno, newblkno, oldblkno)
|
|
struct inode *ip; /* inode for file being extended */
|
|
int ptrno; /* offset of pointer in indirect block */
|
|
ufs_daddr_t newblkno; /* disk block number being added */
|
|
ufs_daddr_t oldblkno; /* previous block number, 0 if none */
|
|
{
|
|
struct allocindir *aip;
|
|
|
|
MALLOC(aip, struct allocindir *, sizeof(struct allocindir),
|
|
M_ALLOCINDIR, M_WAITOK);
|
|
bzero(aip, sizeof(struct allocindir));
|
|
aip->ai_list.wk_type = D_ALLOCINDIR;
|
|
aip->ai_state = ATTACHED;
|
|
aip->ai_offset = ptrno;
|
|
aip->ai_newblkno = newblkno;
|
|
aip->ai_oldblkno = oldblkno;
|
|
aip->ai_freefrag = newfreefrag(ip, oldblkno, ip->i_fs->fs_bsize);
|
|
return (aip);
|
|
}
|
|
|
|
/*
|
|
* Called just before setting an indirect block pointer
|
|
* to a newly allocated file page.
|
|
*/
|
|
void
|
|
softdep_setup_allocindir_page(ip, lbn, bp, ptrno, newblkno, oldblkno, nbp)
|
|
struct inode *ip; /* inode for file being extended */
|
|
ufs_lbn_t lbn; /* allocated block number within file */
|
|
struct buf *bp; /* buffer with indirect blk referencing page */
|
|
int ptrno; /* offset of pointer in indirect block */
|
|
ufs_daddr_t newblkno; /* disk block number being added */
|
|
ufs_daddr_t oldblkno; /* previous block number, 0 if none */
|
|
struct buf *nbp; /* buffer holding allocated page */
|
|
{
|
|
struct allocindir *aip;
|
|
struct pagedep *pagedep;
|
|
|
|
aip = newallocindir(ip, ptrno, newblkno, oldblkno);
|
|
ACQUIRE_LOCK(&lk);
|
|
/*
|
|
* If we are allocating a directory page, then we must
|
|
* allocate an associated pagedep to track additions and
|
|
* deletions.
|
|
*/
|
|
if ((ip->i_mode & IFMT) == IFDIR &&
|
|
pagedep_lookup(ip, lbn, DEPALLOC, &pagedep) == 0)
|
|
WORKLIST_INSERT(&nbp->b_dep, &pagedep->pd_list);
|
|
WORKLIST_INSERT(&nbp->b_dep, &aip->ai_list);
|
|
FREE_LOCK(&lk);
|
|
setup_allocindir_phase2(bp, ip, aip);
|
|
}
|
|
|
|
/*
|
|
* Called just before setting an indirect block pointer to a
|
|
* newly allocated indirect block.
|
|
*/
|
|
void
|
|
softdep_setup_allocindir_meta(nbp, ip, bp, ptrno, newblkno)
|
|
struct buf *nbp; /* newly allocated indirect block */
|
|
struct inode *ip; /* inode for file being extended */
|
|
struct buf *bp; /* indirect block referencing allocated block */
|
|
int ptrno; /* offset of pointer in indirect block */
|
|
ufs_daddr_t newblkno; /* disk block number being added */
|
|
{
|
|
struct allocindir *aip;
|
|
|
|
aip = newallocindir(ip, ptrno, newblkno, 0);
|
|
ACQUIRE_LOCK(&lk);
|
|
WORKLIST_INSERT(&nbp->b_dep, &aip->ai_list);
|
|
FREE_LOCK(&lk);
|
|
setup_allocindir_phase2(bp, ip, aip);
|
|
}
|
|
|
|
/*
|
|
* Called to finish the allocation of the "aip" allocated
|
|
* by one of the two routines above.
|
|
*/
|
|
static void
|
|
setup_allocindir_phase2(bp, ip, aip)
|
|
struct buf *bp; /* in-memory copy of the indirect block */
|
|
struct inode *ip; /* inode for file being extended */
|
|
struct allocindir *aip; /* allocindir allocated by the above routines */
|
|
{
|
|
struct worklist *wk;
|
|
struct indirdep *indirdep, *newindirdep;
|
|
struct bmsafemap *bmsafemap;
|
|
struct allocindir *oldaip;
|
|
struct freefrag *freefrag;
|
|
struct newblk *newblk;
|
|
|
|
if (bp->b_lblkno >= 0)
|
|
panic("setup_allocindir_phase2: not indir blk");
|
|
for (indirdep = NULL, newindirdep = NULL; ; ) {
|
|
ACQUIRE_LOCK(&lk);
|
|
for (wk = LIST_FIRST(&bp->b_dep); wk;
|
|
wk = LIST_NEXT(wk, wk_list)) {
|
|
if (wk->wk_type != D_INDIRDEP)
|
|
continue;
|
|
indirdep = WK_INDIRDEP(wk);
|
|
break;
|
|
}
|
|
if (indirdep == NULL && newindirdep) {
|
|
indirdep = newindirdep;
|
|
WORKLIST_INSERT(&bp->b_dep, &indirdep->ir_list);
|
|
newindirdep = NULL;
|
|
}
|
|
FREE_LOCK(&lk);
|
|
if (indirdep) {
|
|
if (newblk_lookup(ip->i_fs, aip->ai_newblkno, 0,
|
|
&newblk) == 0)
|
|
panic("setup_allocindir: lost block");
|
|
ACQUIRE_LOCK(&lk);
|
|
if (newblk->nb_state == DEPCOMPLETE) {
|
|
aip->ai_state |= DEPCOMPLETE;
|
|
aip->ai_buf = NULL;
|
|
} else {
|
|
bmsafemap = newblk->nb_bmsafemap;
|
|
aip->ai_buf = bmsafemap->sm_buf;
|
|
LIST_REMOVE(newblk, nb_deps);
|
|
LIST_INSERT_HEAD(&bmsafemap->sm_allocindirhd,
|
|
aip, ai_deps);
|
|
}
|
|
LIST_REMOVE(newblk, nb_hash);
|
|
FREE(newblk, M_NEWBLK);
|
|
aip->ai_indirdep = indirdep;
|
|
/*
|
|
* Check to see if there is an existing dependency
|
|
* for this block. If there is, merge the old
|
|
* dependency into the new one.
|
|
*/
|
|
if (aip->ai_oldblkno == 0)
|
|
oldaip = NULL;
|
|
else
|
|
for (oldaip=LIST_FIRST(&indirdep->ir_deplisthd);
|
|
oldaip; oldaip = LIST_NEXT(oldaip, ai_next))
|
|
if (oldaip->ai_offset == aip->ai_offset)
|
|
break;
|
|
if (oldaip != NULL) {
|
|
if (oldaip->ai_newblkno != aip->ai_oldblkno)
|
|
panic("setup_allocindir_phase2: blkno");
|
|
aip->ai_oldblkno = oldaip->ai_oldblkno;
|
|
freefrag = oldaip->ai_freefrag;
|
|
oldaip->ai_freefrag = aip->ai_freefrag;
|
|
aip->ai_freefrag = freefrag;
|
|
free_allocindir(oldaip, NULL);
|
|
}
|
|
LIST_INSERT_HEAD(&indirdep->ir_deplisthd, aip, ai_next);
|
|
((ufs_daddr_t *)indirdep->ir_savebp->b_data)
|
|
[aip->ai_offset] = aip->ai_oldblkno;
|
|
FREE_LOCK(&lk);
|
|
}
|
|
if (newindirdep) {
|
|
if (indirdep->ir_savebp != NULL)
|
|
brelse(newindirdep->ir_savebp);
|
|
WORKITEM_FREE((caddr_t)newindirdep, D_INDIRDEP);
|
|
}
|
|
if (indirdep)
|
|
break;
|
|
MALLOC(newindirdep, struct indirdep *, sizeof(struct indirdep),
|
|
M_INDIRDEP, M_WAITOK);
|
|
newindirdep->ir_list.wk_type = D_INDIRDEP;
|
|
newindirdep->ir_state = ATTACHED;
|
|
LIST_INIT(&newindirdep->ir_deplisthd);
|
|
LIST_INIT(&newindirdep->ir_donehd);
|
|
if (bp->b_blkno == bp->b_lblkno) {
|
|
VOP_BMAP(bp->b_vp, bp->b_lblkno, NULL, &bp->b_blkno,
|
|
NULL, NULL);
|
|
}
|
|
newindirdep->ir_savebp =
|
|
getblk(ip->i_devvp, bp->b_blkno, bp->b_bcount, 0, 0);
|
|
BUF_KERNPROC(newindirdep->ir_savebp);
|
|
bcopy(bp->b_data, newindirdep->ir_savebp->b_data, bp->b_bcount);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Block de-allocation dependencies.
|
|
*
|
|
* When blocks are de-allocated, the on-disk pointers must be nullified before
|
|
* the blocks are made available for use by other files. (The true
|
|
* requirement is that old pointers must be nullified before new on-disk
|
|
* pointers are set. We chose this slightly more stringent requirement to
|
|
* reduce complexity.) Our implementation handles this dependency by updating
|
|
* the inode (or indirect block) appropriately but delaying the actual block
|
|
* de-allocation (i.e., freemap and free space count manipulation) until
|
|
* after the updated versions reach stable storage. After the disk is
|
|
* updated, the blocks can be safely de-allocated whenever it is convenient.
|
|
* This implementation handles only the common case of reducing a file's
|
|
* length to zero. Other cases are handled by the conventional synchronous
|
|
* write approach.
|
|
*
|
|
* The ffs implementation with which we worked double-checks
|
|
* the state of the block pointers and file size as it reduces
|
|
* a file's length. Some of this code is replicated here in our
|
|
* soft updates implementation. The freeblks->fb_chkcnt field is
|
|
* used to transfer a part of this information to the procedure
|
|
* that eventually de-allocates the blocks.
|
|
*
|
|
* This routine should be called from the routine that shortens
|
|
* a file's length, before the inode's size or block pointers
|
|
* are modified. It will save the block pointer information for
|
|
* later release and zero the inode so that the calling routine
|
|
* can release it.
|
|
*/
|
|
void
|
|
softdep_setup_freeblocks(ip, length)
|
|
struct inode *ip; /* The inode whose length is to be reduced */
|
|
off_t length; /* The new length for the file */
|
|
{
|
|
struct freeblks *freeblks;
|
|
struct inodedep *inodedep;
|
|
struct allocdirect *adp;
|
|
struct vnode *vp;
|
|
struct buf *bp;
|
|
struct fs *fs;
|
|
int i, error;
|
|
|
|
fs = ip->i_fs;
|
|
if (length != 0)
|
|
panic("softde_setup_freeblocks: non-zero length");
|
|
MALLOC(freeblks, struct freeblks *, sizeof(struct freeblks),
|
|
M_FREEBLKS, M_WAITOK);
|
|
bzero(freeblks, sizeof(struct freeblks));
|
|
freeblks->fb_list.wk_type = D_FREEBLKS;
|
|
freeblks->fb_uid = ip->i_uid;
|
|
freeblks->fb_previousinum = ip->i_number;
|
|
freeblks->fb_devvp = ip->i_devvp;
|
|
freeblks->fb_fs = fs;
|
|
freeblks->fb_oldsize = ip->i_size;
|
|
freeblks->fb_newsize = length;
|
|
freeblks->fb_chkcnt = ip->i_blocks;
|
|
for (i = 0; i < NDADDR; i++) {
|
|
freeblks->fb_dblks[i] = ip->i_db[i];
|
|
ip->i_db[i] = 0;
|
|
}
|
|
for (i = 0; i < NIADDR; i++) {
|
|
freeblks->fb_iblks[i] = ip->i_ib[i];
|
|
ip->i_ib[i] = 0;
|
|
}
|
|
ip->i_blocks = 0;
|
|
ip->i_size = 0;
|
|
/*
|
|
* Push the zero'ed inode to to its disk buffer so that we are free
|
|
* to delete its dependencies below. Once the dependencies are gone
|
|
* the buffer can be safely released.
|
|
*/
|
|
if ((error = bread(ip->i_devvp,
|
|
fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
|
|
(int)fs->fs_bsize, NOCRED, &bp)) != 0)
|
|
softdep_error("softdep_setup_freeblocks", error);
|
|
*((struct dinode *)bp->b_data + ino_to_fsbo(fs, ip->i_number)) =
|
|
ip->i_din;
|
|
/*
|
|
* Find and eliminate any inode dependencies.
|
|
*/
|
|
ACQUIRE_LOCK(&lk);
|
|
(void) inodedep_lookup(fs, ip->i_number, DEPALLOC, &inodedep);
|
|
if ((inodedep->id_state & IOSTARTED) != 0)
|
|
panic("softdep_setup_freeblocks: inode busy");
|
|
/*
|
|
* Because the file length has been truncated to zero, any
|
|
* pending block allocation dependency structures associated
|
|
* with this inode are obsolete and can simply be de-allocated.
|
|
* We must first merge the two dependency lists to get rid of
|
|
* any duplicate freefrag structures, then purge the merged list.
|
|
*/
|
|
merge_inode_lists(inodedep);
|
|
while ((adp = TAILQ_FIRST(&inodedep->id_inoupdt)) != 0)
|
|
free_allocdirect(&inodedep->id_inoupdt, adp, 1);
|
|
FREE_LOCK(&lk);
|
|
bdwrite(bp);
|
|
/*
|
|
* We must wait for any I/O in progress to finish so that
|
|
* all potential buffers on the dirty list will be visible.
|
|
* Once they are all there, walk the list and get rid of
|
|
* any dependencies.
|
|
*/
|
|
vp = ITOV(ip);
|
|
ACQUIRE_LOCK(&lk);
|
|
drain_output(vp, 1);
|
|
while (getdirtybuf(&TAILQ_FIRST(&vp->v_dirtyblkhd), MNT_WAIT)) {
|
|
bp = TAILQ_FIRST(&vp->v_dirtyblkhd);
|
|
(void) inodedep_lookup(fs, ip->i_number, 0, &inodedep);
|
|
deallocate_dependencies(bp, inodedep);
|
|
bp->b_flags |= B_INVAL | B_NOCACHE;
|
|
FREE_LOCK(&lk);
|
|
brelse(bp);
|
|
ACQUIRE_LOCK(&lk);
|
|
}
|
|
/*
|
|
* Add the freeblks structure to the list of operations that
|
|
* must await the zero'ed inode being written to disk. If we
|
|
* still have a bitmap dependency, then the inode has never been
|
|
* written to disk, so we can process the freeblks immediately.
|
|
* If the inodedep does not exist, then the zero'ed inode has
|
|
* been written and we can also proceed.
|
|
*/
|
|
if (inodedep_lookup(fs, ip->i_number, 0, &inodedep) == 0 ||
|
|
free_inodedep(inodedep) ||
|
|
(inodedep->id_state & DEPCOMPLETE) == 0) {
|
|
FREE_LOCK(&lk);
|
|
handle_workitem_freeblocks(freeblks);
|
|
} else {
|
|
WORKLIST_INSERT(&inodedep->id_bufwait, &freeblks->fb_list);
|
|
FREE_LOCK(&lk);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Reclaim any dependency structures from a buffer that is about to
|
|
* be reallocated to a new vnode. The buffer must be locked, thus,
|
|
* no I/O completion operations can occur while we are manipulating
|
|
* its associated dependencies. The mutex is held so that other I/O's
|
|
* associated with related dependencies do not occur.
|
|
*/
|
|
static void
|
|
deallocate_dependencies(bp, inodedep)
|
|
struct buf *bp;
|
|
struct inodedep *inodedep;
|
|
{
|
|
struct worklist *wk;
|
|
struct indirdep *indirdep;
|
|
struct allocindir *aip;
|
|
struct pagedep *pagedep;
|
|
struct dirrem *dirrem;
|
|
struct diradd *dap;
|
|
int i;
|
|
|
|
while ((wk = LIST_FIRST(&bp->b_dep)) != NULL) {
|
|
switch (wk->wk_type) {
|
|
|
|
case D_INDIRDEP:
|
|
indirdep = WK_INDIRDEP(wk);
|
|
/*
|
|
* None of the indirect pointers will ever be visible,
|
|
* so they can simply be tossed. GOINGAWAY ensures
|
|
* that allocated pointers will be saved in the buffer
|
|
* cache until they are freed. Note that they will
|
|
* only be able to be found by their physical address
|
|
* since the inode mapping the logical address will
|
|
* be gone. The save buffer used for the safe copy
|
|
* was allocated in setup_allocindir_phase2 using
|
|
* the physical address so it could be used for this
|
|
* purpose. Hence we swap the safe copy with the real
|
|
* copy, allowing the safe copy to be freed and holding
|
|
* on to the real copy for later use in indir_trunc.
|
|
*/
|
|
if (indirdep->ir_state & GOINGAWAY)
|
|
panic("deallocate_dependencies: already gone");
|
|
indirdep->ir_state |= GOINGAWAY;
|
|
while ((aip = LIST_FIRST(&indirdep->ir_deplisthd)) != 0)
|
|
free_allocindir(aip, inodedep);
|
|
if (bp->b_lblkno >= 0 ||
|
|
bp->b_blkno != indirdep->ir_savebp->b_lblkno)
|
|
panic("deallocate_dependencies: not indir");
|
|
bcopy(bp->b_data, indirdep->ir_savebp->b_data,
|
|
bp->b_bcount);
|
|
WORKLIST_REMOVE(wk);
|
|
WORKLIST_INSERT(&indirdep->ir_savebp->b_dep, wk);
|
|
continue;
|
|
|
|
case D_PAGEDEP:
|
|
pagedep = WK_PAGEDEP(wk);
|
|
/*
|
|
* None of the directory additions will ever be
|
|
* visible, so they can simply be tossed.
|
|
*/
|
|
for (i = 0; i < DAHASHSZ; i++)
|
|
while ((dap =
|
|
LIST_FIRST(&pagedep->pd_diraddhd[i])))
|
|
free_diradd(dap);
|
|
while ((dap = LIST_FIRST(&pagedep->pd_pendinghd)) != 0)
|
|
free_diradd(dap);
|
|
/*
|
|
* Copy any directory remove dependencies to the list
|
|
* to be processed after the zero'ed inode is written.
|
|
* If the inode has already been written, then they
|
|
* can be dumped directly onto the work list.
|
|
*/
|
|
for (dirrem = LIST_FIRST(&pagedep->pd_dirremhd); dirrem;
|
|
dirrem = LIST_NEXT(dirrem, dm_next)) {
|
|
LIST_REMOVE(dirrem, dm_next);
|
|
dirrem->dm_dirinum = pagedep->pd_ino;
|
|
if (inodedep == NULL ||
|
|
(inodedep->id_state & ALLCOMPLETE) ==
|
|
ALLCOMPLETE)
|
|
add_to_worklist(&dirrem->dm_list);
|
|
else
|
|
WORKLIST_INSERT(&inodedep->id_bufwait,
|
|
&dirrem->dm_list);
|
|
}
|
|
WORKLIST_REMOVE(&pagedep->pd_list);
|
|
LIST_REMOVE(pagedep, pd_hash);
|
|
WORKITEM_FREE(pagedep, D_PAGEDEP);
|
|
continue;
|
|
|
|
case D_ALLOCINDIR:
|
|
free_allocindir(WK_ALLOCINDIR(wk), inodedep);
|
|
continue;
|
|
|
|
case D_ALLOCDIRECT:
|
|
case D_INODEDEP:
|
|
panic("deallocate_dependencies: Unexpected type %s",
|
|
TYPENAME(wk->wk_type));
|
|
/* NOTREACHED */
|
|
|
|
default:
|
|
panic("deallocate_dependencies: Unknown type %s",
|
|
TYPENAME(wk->wk_type));
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Free an allocdirect. Generate a new freefrag work request if appropriate.
|
|
* This routine must be called with splbio interrupts blocked.
|
|
*/
|
|
static void
|
|
free_allocdirect(adphead, adp, delay)
|
|
struct allocdirectlst *adphead;
|
|
struct allocdirect *adp;
|
|
int delay;
|
|
{
|
|
|
|
#ifdef DEBUG
|
|
if (lk.lkt_held == -1)
|
|
panic("free_allocdirect: lock not held");
|
|
#endif
|
|
if ((adp->ad_state & DEPCOMPLETE) == 0)
|
|
LIST_REMOVE(adp, ad_deps);
|
|
TAILQ_REMOVE(adphead, adp, ad_next);
|
|
if ((adp->ad_state & COMPLETE) == 0)
|
|
WORKLIST_REMOVE(&adp->ad_list);
|
|
if (adp->ad_freefrag != NULL) {
|
|
if (delay)
|
|
WORKLIST_INSERT(&adp->ad_inodedep->id_bufwait,
|
|
&adp->ad_freefrag->ff_list);
|
|
else
|
|
add_to_worklist(&adp->ad_freefrag->ff_list);
|
|
}
|
|
WORKITEM_FREE(adp, D_ALLOCDIRECT);
|
|
}
|
|
|
|
/*
|
|
* Prepare an inode to be freed. The actual free operation is not
|
|
* done until the zero'ed inode has been written to disk.
|
|
*/
|
|
void
|
|
softdep_freefile(pvp, ino, mode)
|
|
struct vnode *pvp;
|
|
ino_t ino;
|
|
int mode;
|
|
{
|
|
struct inode *ip = VTOI(pvp);
|
|
struct inodedep *inodedep;
|
|
struct freefile *freefile;
|
|
|
|
/*
|
|
* This sets up the inode de-allocation dependency.
|
|
*/
|
|
MALLOC(freefile, struct freefile *, sizeof(struct freefile),
|
|
M_FREEFILE, M_WAITOK);
|
|
freefile->fx_list.wk_type = D_FREEFILE;
|
|
freefile->fx_list.wk_state = 0;
|
|
freefile->fx_mode = mode;
|
|
freefile->fx_oldinum = ino;
|
|
freefile->fx_devvp = ip->i_devvp;
|
|
freefile->fx_fs = ip->i_fs;
|
|
|
|
/*
|
|
* If the inodedep does not exist, then the zero'ed inode has
|
|
* been written to disk. If the allocated inode has never been
|
|
* written to disk, then the on-disk inode is zero'ed. In either
|
|
* case we can free the file immediately.
|
|
*/
|
|
ACQUIRE_LOCK(&lk);
|
|
if (inodedep_lookup(ip->i_fs, ino, 0, &inodedep) == 0 ||
|
|
check_inode_unwritten(inodedep)) {
|
|
FREE_LOCK(&lk);
|
|
handle_workitem_freefile(freefile);
|
|
return;
|
|
}
|
|
WORKLIST_INSERT(&inodedep->id_inowait, &freefile->fx_list);
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* Check to see if an inode has never been written to disk. If
|
|
* so free the inodedep and return success, otherwise return failure.
|
|
* This routine must be called with splbio interrupts blocked.
|
|
*
|
|
* If we still have a bitmap dependency, then the inode has never
|
|
* been written to disk. Drop the dependency as it is no longer
|
|
* necessary since the inode is being deallocated. We set the
|
|
* ALLCOMPLETE flags since the bitmap now properly shows that the
|
|
* inode is not allocated. Even if the inode is actively being
|
|
* written, it has been rolled back to its zero'ed state, so we
|
|
* are ensured that a zero inode is what is on the disk. For short
|
|
* lived files, this change will usually result in removing all the
|
|
* dependencies from the inode so that it can be freed immediately.
|
|
*/
|
|
static int
|
|
check_inode_unwritten(inodedep)
|
|
struct inodedep *inodedep;
|
|
{
|
|
|
|
if ((inodedep->id_state & DEPCOMPLETE) != 0 ||
|
|
LIST_FIRST(&inodedep->id_pendinghd) != NULL ||
|
|
LIST_FIRST(&inodedep->id_bufwait) != NULL ||
|
|
LIST_FIRST(&inodedep->id_inowait) != NULL ||
|
|
TAILQ_FIRST(&inodedep->id_inoupdt) != NULL ||
|
|
TAILQ_FIRST(&inodedep->id_newinoupdt) != NULL ||
|
|
inodedep->id_nlinkdelta != 0)
|
|
return (0);
|
|
inodedep->id_state |= ALLCOMPLETE;
|
|
LIST_REMOVE(inodedep, id_deps);
|
|
inodedep->id_buf = NULL;
|
|
WORKLIST_REMOVE(&inodedep->id_list);
|
|
if (inodedep->id_savedino != NULL) {
|
|
FREE(inodedep->id_savedino, M_INODEDEP);
|
|
inodedep->id_savedino = NULL;
|
|
}
|
|
if (free_inodedep(inodedep) == 0)
|
|
panic("check_inode_unwritten: busy inode");
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Try to free an inodedep structure. Return 1 if it could be freed.
|
|
*/
|
|
static int
|
|
free_inodedep(inodedep)
|
|
struct inodedep *inodedep;
|
|
{
|
|
|
|
if ((inodedep->id_state & ONWORKLIST) != 0 ||
|
|
(inodedep->id_state & ALLCOMPLETE) != ALLCOMPLETE ||
|
|
LIST_FIRST(&inodedep->id_pendinghd) != NULL ||
|
|
LIST_FIRST(&inodedep->id_bufwait) != NULL ||
|
|
LIST_FIRST(&inodedep->id_inowait) != NULL ||
|
|
TAILQ_FIRST(&inodedep->id_inoupdt) != NULL ||
|
|
TAILQ_FIRST(&inodedep->id_newinoupdt) != NULL ||
|
|
inodedep->id_nlinkdelta != 0 || inodedep->id_savedino != NULL)
|
|
return (0);
|
|
LIST_REMOVE(inodedep, id_hash);
|
|
WORKITEM_FREE(inodedep, D_INODEDEP);
|
|
num_inodedep -= 1;
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* This workitem routine performs the block de-allocation.
|
|
* The workitem is added to the pending list after the updated
|
|
* inode block has been written to disk. As mentioned above,
|
|
* checks regarding the number of blocks de-allocated (compared
|
|
* to the number of blocks allocated for the file) are also
|
|
* performed in this function.
|
|
*/
|
|
static void
|
|
handle_workitem_freeblocks(freeblks)
|
|
struct freeblks *freeblks;
|
|
{
|
|
struct inode tip;
|
|
ufs_daddr_t bn;
|
|
struct fs *fs;
|
|
int i, level, bsize;
|
|
long nblocks, blocksreleased = 0;
|
|
int error, allerror = 0;
|
|
ufs_lbn_t baselbns[NIADDR], tmpval;
|
|
|
|
tip.i_number = freeblks->fb_previousinum;
|
|
tip.i_devvp = freeblks->fb_devvp;
|
|
tip.i_dev = freeblks->fb_devvp->v_rdev;
|
|
tip.i_fs = freeblks->fb_fs;
|
|
tip.i_size = freeblks->fb_oldsize;
|
|
tip.i_uid = freeblks->fb_uid;
|
|
fs = freeblks->fb_fs;
|
|
tmpval = 1;
|
|
baselbns[0] = NDADDR;
|
|
for (i = 1; i < NIADDR; i++) {
|
|
tmpval *= NINDIR(fs);
|
|
baselbns[i] = baselbns[i - 1] + tmpval;
|
|
}
|
|
nblocks = btodb(fs->fs_bsize);
|
|
blocksreleased = 0;
|
|
/*
|
|
* Indirect blocks first.
|
|
*/
|
|
for (level = (NIADDR - 1); level >= 0; level--) {
|
|
if ((bn = freeblks->fb_iblks[level]) == 0)
|
|
continue;
|
|
if ((error = indir_trunc(&tip, fsbtodb(fs, bn), level,
|
|
baselbns[level], &blocksreleased)) == 0)
|
|
allerror = error;
|
|
ffs_blkfree(&tip, bn, fs->fs_bsize);
|
|
blocksreleased += nblocks;
|
|
}
|
|
/*
|
|
* All direct blocks or frags.
|
|
*/
|
|
for (i = (NDADDR - 1); i >= 0; i--) {
|
|
if ((bn = freeblks->fb_dblks[i]) == 0)
|
|
continue;
|
|
bsize = blksize(fs, &tip, i);
|
|
ffs_blkfree(&tip, bn, bsize);
|
|
blocksreleased += btodb(bsize);
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (freeblks->fb_chkcnt != blocksreleased)
|
|
panic("handle_workitem_freeblocks: block count");
|
|
if (allerror)
|
|
softdep_error("handle_workitem_freeblks", allerror);
|
|
#endif /* DIAGNOSTIC */
|
|
WORKITEM_FREE(freeblks, D_FREEBLKS);
|
|
}
|
|
|
|
/*
|
|
* Release blocks associated with the inode ip and stored in the indirect
|
|
* block dbn. If level is greater than SINGLE, the block is an indirect block
|
|
* and recursive calls to indirtrunc must be used to cleanse other indirect
|
|
* blocks.
|
|
*/
|
|
static int
|
|
indir_trunc(ip, dbn, level, lbn, countp)
|
|
struct inode *ip;
|
|
ufs_daddr_t dbn;
|
|
int level;
|
|
ufs_lbn_t lbn;
|
|
long *countp;
|
|
{
|
|
struct buf *bp;
|
|
ufs_daddr_t *bap;
|
|
ufs_daddr_t nb;
|
|
struct fs *fs;
|
|
struct worklist *wk;
|
|
struct indirdep *indirdep;
|
|
int i, lbnadd, nblocks;
|
|
int error, allerror = 0;
|
|
|
|
fs = ip->i_fs;
|
|
lbnadd = 1;
|
|
for (i = level; i > 0; i--)
|
|
lbnadd *= NINDIR(fs);
|
|
/*
|
|
* Get buffer of block pointers to be freed. This routine is not
|
|
* called until the zero'ed inode has been written, so it is safe
|
|
* to free blocks as they are encountered. Because the inode has
|
|
* been zero'ed, calls to bmap on these blocks will fail. So, we
|
|
* have to use the on-disk address and the block device for the
|
|
* filesystem to look them up. If the file was deleted before its
|
|
* indirect blocks were all written to disk, the routine that set
|
|
* us up (deallocate_dependencies) will have arranged to leave
|
|
* a complete copy of the indirect block in memory for our use.
|
|
* Otherwise we have to read the blocks in from the disk.
|
|
*/
|
|
ACQUIRE_LOCK(&lk);
|
|
if ((bp = incore(ip->i_devvp, dbn)) != NULL &&
|
|
(wk = LIST_FIRST(&bp->b_dep)) != NULL) {
|
|
if (wk->wk_type != D_INDIRDEP ||
|
|
(indirdep = WK_INDIRDEP(wk))->ir_savebp != bp ||
|
|
(indirdep->ir_state & GOINGAWAY) == 0)
|
|
panic("indir_trunc: lost indirdep");
|
|
WORKLIST_REMOVE(wk);
|
|
WORKITEM_FREE(indirdep, D_INDIRDEP);
|
|
if (LIST_FIRST(&bp->b_dep) != NULL)
|
|
panic("indir_trunc: dangling dep");
|
|
FREE_LOCK(&lk);
|
|
} else {
|
|
FREE_LOCK(&lk);
|
|
error = bread(ip->i_devvp, dbn, (int)fs->fs_bsize, NOCRED, &bp);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
/*
|
|
* Recursively free indirect blocks.
|
|
*/
|
|
bap = (ufs_daddr_t *)bp->b_data;
|
|
nblocks = btodb(fs->fs_bsize);
|
|
for (i = NINDIR(fs) - 1; i >= 0; i--) {
|
|
if ((nb = bap[i]) == 0)
|
|
continue;
|
|
if (level != 0) {
|
|
if ((error = indir_trunc(ip, fsbtodb(fs, nb),
|
|
level - 1, lbn + (i * lbnadd), countp)) != 0)
|
|
allerror = error;
|
|
}
|
|
ffs_blkfree(ip, nb, fs->fs_bsize);
|
|
*countp += nblocks;
|
|
}
|
|
bp->b_flags |= B_INVAL | B_NOCACHE;
|
|
brelse(bp);
|
|
return (allerror);
|
|
}
|
|
|
|
/*
|
|
* Free an allocindir.
|
|
* This routine must be called with splbio interrupts blocked.
|
|
*/
|
|
static void
|
|
free_allocindir(aip, inodedep)
|
|
struct allocindir *aip;
|
|
struct inodedep *inodedep;
|
|
{
|
|
struct freefrag *freefrag;
|
|
|
|
#ifdef DEBUG
|
|
if (lk.lkt_held == -1)
|
|
panic("free_allocindir: lock not held");
|
|
#endif
|
|
if ((aip->ai_state & DEPCOMPLETE) == 0)
|
|
LIST_REMOVE(aip, ai_deps);
|
|
if (aip->ai_state & ONWORKLIST)
|
|
WORKLIST_REMOVE(&aip->ai_list);
|
|
LIST_REMOVE(aip, ai_next);
|
|
if ((freefrag = aip->ai_freefrag) != NULL) {
|
|
if (inodedep == NULL)
|
|
add_to_worklist(&freefrag->ff_list);
|
|
else
|
|
WORKLIST_INSERT(&inodedep->id_bufwait,
|
|
&freefrag->ff_list);
|
|
}
|
|
WORKITEM_FREE(aip, D_ALLOCINDIR);
|
|
}
|
|
|
|
/*
|
|
* Directory entry addition dependencies.
|
|
*
|
|
* When adding a new directory entry, the inode (with its incremented link
|
|
* count) must be written to disk before the directory entry's pointer to it.
|
|
* Also, if the inode is newly allocated, the corresponding freemap must be
|
|
* updated (on disk) before the directory entry's pointer. These requirements
|
|
* are met via undo/redo on the directory entry's pointer, which consists
|
|
* simply of the inode number.
|
|
*
|
|
* As directory entries are added and deleted, the free space within a
|
|
* directory block can become fragmented. The ufs file system will compact
|
|
* a fragmented directory block to make space for a new entry. When this
|
|
* occurs, the offsets of previously added entries change. Any "diradd"
|
|
* dependency structures corresponding to these entries must be updated with
|
|
* the new offsets.
|
|
*/
|
|
|
|
/*
|
|
* This routine is called after the in-memory inode's link
|
|
* count has been incremented, but before the directory entry's
|
|
* pointer to the inode has been set.
|
|
*/
|
|
void
|
|
softdep_setup_directory_add(bp, dp, diroffset, newinum, newdirbp)
|
|
struct buf *bp; /* buffer containing directory block */
|
|
struct inode *dp; /* inode for directory */
|
|
off_t diroffset; /* offset of new entry in directory */
|
|
long newinum; /* inode referenced by new directory entry */
|
|
struct buf *newdirbp; /* non-NULL => contents of new mkdir */
|
|
{
|
|
int offset; /* offset of new entry within directory block */
|
|
ufs_lbn_t lbn; /* block in directory containing new entry */
|
|
struct fs *fs;
|
|
struct diradd *dap;
|
|
struct pagedep *pagedep;
|
|
struct inodedep *inodedep;
|
|
struct mkdir *mkdir1, *mkdir2;
|
|
|
|
/*
|
|
* Whiteouts have no dependencies.
|
|
*/
|
|
if (newinum == WINO) {
|
|
if (newdirbp != NULL)
|
|
bdwrite(newdirbp);
|
|
return;
|
|
}
|
|
|
|
fs = dp->i_fs;
|
|
lbn = lblkno(fs, diroffset);
|
|
offset = blkoff(fs, diroffset);
|
|
MALLOC(dap, struct diradd *, sizeof(struct diradd), M_DIRADD, M_WAITOK);
|
|
bzero(dap, sizeof(struct diradd));
|
|
dap->da_list.wk_type = D_DIRADD;
|
|
dap->da_offset = offset;
|
|
dap->da_newinum = newinum;
|
|
dap->da_state = ATTACHED;
|
|
if (newdirbp == NULL) {
|
|
dap->da_state |= DEPCOMPLETE;
|
|
ACQUIRE_LOCK(&lk);
|
|
} else {
|
|
dap->da_state |= MKDIR_BODY | MKDIR_PARENT;
|
|
MALLOC(mkdir1, struct mkdir *, sizeof(struct mkdir), M_MKDIR,
|
|
M_WAITOK);
|
|
mkdir1->md_list.wk_type = D_MKDIR;
|
|
mkdir1->md_state = MKDIR_BODY;
|
|
mkdir1->md_diradd = dap;
|
|
MALLOC(mkdir2, struct mkdir *, sizeof(struct mkdir), M_MKDIR,
|
|
M_WAITOK);
|
|
mkdir2->md_list.wk_type = D_MKDIR;
|
|
mkdir2->md_state = MKDIR_PARENT;
|
|
mkdir2->md_diradd = dap;
|
|
/*
|
|
* Dependency on "." and ".." being written to disk.
|
|
*/
|
|
mkdir1->md_buf = newdirbp;
|
|
ACQUIRE_LOCK(&lk);
|
|
LIST_INSERT_HEAD(&mkdirlisthd, mkdir1, md_mkdirs);
|
|
WORKLIST_INSERT(&newdirbp->b_dep, &mkdir1->md_list);
|
|
FREE_LOCK(&lk);
|
|
bdwrite(newdirbp);
|
|
/*
|
|
* Dependency on link count increase for parent directory
|
|
*/
|
|
ACQUIRE_LOCK(&lk);
|
|
if (inodedep_lookup(dp->i_fs, dp->i_number, 0, &inodedep) == 0
|
|
|| (inodedep->id_state & ALLCOMPLETE) == ALLCOMPLETE) {
|
|
dap->da_state &= ~MKDIR_PARENT;
|
|
WORKITEM_FREE(mkdir2, D_MKDIR);
|
|
} else {
|
|
LIST_INSERT_HEAD(&mkdirlisthd, mkdir2, md_mkdirs);
|
|
WORKLIST_INSERT(&inodedep->id_bufwait,&mkdir2->md_list);
|
|
}
|
|
}
|
|
/*
|
|
* Link into parent directory pagedep to await its being written.
|
|
*/
|
|
if (pagedep_lookup(dp, lbn, DEPALLOC, &pagedep) == 0)
|
|
WORKLIST_INSERT(&bp->b_dep, &pagedep->pd_list);
|
|
dap->da_pagedep = pagedep;
|
|
LIST_INSERT_HEAD(&pagedep->pd_diraddhd[DIRADDHASH(offset)], dap,
|
|
da_pdlist);
|
|
/*
|
|
* Link into its inodedep. Put it on the id_bufwait list if the inode
|
|
* is not yet written. If it is written, do the post-inode write
|
|
* processing to put it on the id_pendinghd list.
|
|
*/
|
|
(void) inodedep_lookup(fs, newinum, DEPALLOC, &inodedep);
|
|
if ((inodedep->id_state & ALLCOMPLETE) == ALLCOMPLETE)
|
|
diradd_inode_written(dap, inodedep);
|
|
else
|
|
WORKLIST_INSERT(&inodedep->id_bufwait, &dap->da_list);
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* This procedure is called to change the offset of a directory
|
|
* entry when compacting a directory block which must be owned
|
|
* exclusively by the caller. Note that the actual entry movement
|
|
* must be done in this procedure to ensure that no I/O completions
|
|
* occur while the move is in progress.
|
|
*/
|
|
void
|
|
softdep_change_directoryentry_offset(dp, base, oldloc, newloc, entrysize)
|
|
struct inode *dp; /* inode for directory */
|
|
caddr_t base; /* address of dp->i_offset */
|
|
caddr_t oldloc; /* address of old directory location */
|
|
caddr_t newloc; /* address of new directory location */
|
|
int entrysize; /* size of directory entry */
|
|
{
|
|
int offset, oldoffset, newoffset;
|
|
struct pagedep *pagedep;
|
|
struct diradd *dap;
|
|
ufs_lbn_t lbn;
|
|
|
|
ACQUIRE_LOCK(&lk);
|
|
lbn = lblkno(dp->i_fs, dp->i_offset);
|
|
offset = blkoff(dp->i_fs, dp->i_offset);
|
|
if (pagedep_lookup(dp, lbn, 0, &pagedep) == 0)
|
|
goto done;
|
|
oldoffset = offset + (oldloc - base);
|
|
newoffset = offset + (newloc - base);
|
|
for (dap = LIST_FIRST(&pagedep->pd_diraddhd[DIRADDHASH(oldoffset)]);
|
|
dap; dap = LIST_NEXT(dap, da_pdlist)) {
|
|
if (dap->da_offset != oldoffset)
|
|
continue;
|
|
dap->da_offset = newoffset;
|
|
if (DIRADDHASH(newoffset) == DIRADDHASH(oldoffset))
|
|
break;
|
|
LIST_REMOVE(dap, da_pdlist);
|
|
LIST_INSERT_HEAD(&pagedep->pd_diraddhd[DIRADDHASH(newoffset)],
|
|
dap, da_pdlist);
|
|
break;
|
|
}
|
|
if (dap == NULL) {
|
|
for (dap = LIST_FIRST(&pagedep->pd_pendinghd);
|
|
dap; dap = LIST_NEXT(dap, da_pdlist)) {
|
|
if (dap->da_offset == oldoffset) {
|
|
dap->da_offset = newoffset;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
done:
|
|
bcopy(oldloc, newloc, entrysize);
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* Free a diradd dependency structure. This routine must be called
|
|
* with splbio interrupts blocked.
|
|
*/
|
|
static void
|
|
free_diradd(dap)
|
|
struct diradd *dap;
|
|
{
|
|
struct dirrem *dirrem;
|
|
struct pagedep *pagedep;
|
|
struct inodedep *inodedep;
|
|
struct mkdir *mkdir, *nextmd;
|
|
|
|
#ifdef DEBUG
|
|
if (lk.lkt_held == -1)
|
|
panic("free_diradd: lock not held");
|
|
#endif
|
|
WORKLIST_REMOVE(&dap->da_list);
|
|
LIST_REMOVE(dap, da_pdlist);
|
|
if ((dap->da_state & DIRCHG) == 0) {
|
|
pagedep = dap->da_pagedep;
|
|
} else {
|
|
dirrem = dap->da_previous;
|
|
pagedep = dirrem->dm_pagedep;
|
|
dirrem->dm_dirinum = pagedep->pd_ino;
|
|
add_to_worklist(&dirrem->dm_list);
|
|
}
|
|
if (inodedep_lookup(VFSTOUFS(pagedep->pd_mnt)->um_fs, dap->da_newinum,
|
|
0, &inodedep) != 0)
|
|
(void) free_inodedep(inodedep);
|
|
if ((dap->da_state & (MKDIR_PARENT | MKDIR_BODY)) != 0) {
|
|
for (mkdir = LIST_FIRST(&mkdirlisthd); mkdir; mkdir = nextmd) {
|
|
nextmd = LIST_NEXT(mkdir, md_mkdirs);
|
|
if (mkdir->md_diradd != dap)
|
|
continue;
|
|
dap->da_state &= ~mkdir->md_state;
|
|
WORKLIST_REMOVE(&mkdir->md_list);
|
|
LIST_REMOVE(mkdir, md_mkdirs);
|
|
WORKITEM_FREE(mkdir, D_MKDIR);
|
|
}
|
|
if ((dap->da_state & (MKDIR_PARENT | MKDIR_BODY)) != 0)
|
|
panic("free_diradd: unfound ref");
|
|
}
|
|
WORKITEM_FREE(dap, D_DIRADD);
|
|
}
|
|
|
|
/*
|
|
* Directory entry removal dependencies.
|
|
*
|
|
* When removing a directory entry, the entry's inode pointer must be
|
|
* zero'ed on disk before the corresponding inode's link count is decremented
|
|
* (possibly freeing the inode for re-use). This dependency is handled by
|
|
* updating the directory entry but delaying the inode count reduction until
|
|
* after the directory block has been written to disk. After this point, the
|
|
* inode count can be decremented whenever it is convenient.
|
|
*/
|
|
|
|
/*
|
|
* This routine should be called immediately after removing
|
|
* a directory entry. The inode's link count should not be
|
|
* decremented by the calling procedure -- the soft updates
|
|
* code will do this task when it is safe.
|
|
*/
|
|
void
|
|
softdep_setup_remove(bp, dp, ip, isrmdir)
|
|
struct buf *bp; /* buffer containing directory block */
|
|
struct inode *dp; /* inode for the directory being modified */
|
|
struct inode *ip; /* inode for directory entry being removed */
|
|
int isrmdir; /* indicates if doing RMDIR */
|
|
{
|
|
struct dirrem *dirrem, *prevdirrem;
|
|
|
|
/*
|
|
* Allocate a new dirrem if appropriate and ACQUIRE_LOCK.
|
|
*/
|
|
dirrem = newdirrem(bp, dp, ip, isrmdir, &prevdirrem);
|
|
|
|
/*
|
|
* If the COMPLETE flag is clear, then there were no active
|
|
* entries and we want to roll back to a zeroed entry until
|
|
* the new inode is committed to disk. If the COMPLETE flag is
|
|
* set then we have deleted an entry that never made it to
|
|
* disk. If the entry we deleted resulted from a name change,
|
|
* then the old name still resides on disk. We cannot delete
|
|
* its inode (returned to us in prevdirrem) until the zeroed
|
|
* directory entry gets to disk. The new inode has never been
|
|
* referenced on the disk, so can be deleted immediately.
|
|
*/
|
|
if ((dirrem->dm_state & COMPLETE) == 0) {
|
|
LIST_INSERT_HEAD(&dirrem->dm_pagedep->pd_dirremhd, dirrem,
|
|
dm_next);
|
|
FREE_LOCK(&lk);
|
|
} else {
|
|
if (prevdirrem != NULL)
|
|
LIST_INSERT_HEAD(&dirrem->dm_pagedep->pd_dirremhd,
|
|
prevdirrem, dm_next);
|
|
dirrem->dm_dirinum = dirrem->dm_pagedep->pd_ino;
|
|
FREE_LOCK(&lk);
|
|
handle_workitem_remove(dirrem);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Allocate a new dirrem if appropriate and return it along with
|
|
* its associated pagedep. Called without a lock, returns with lock.
|
|
*/
|
|
static long num_dirrem; /* number of dirrem allocated */
|
|
static struct dirrem *
|
|
newdirrem(bp, dp, ip, isrmdir, prevdirremp)
|
|
struct buf *bp; /* buffer containing directory block */
|
|
struct inode *dp; /* inode for the directory being modified */
|
|
struct inode *ip; /* inode for directory entry being removed */
|
|
int isrmdir; /* indicates if doing RMDIR */
|
|
struct dirrem **prevdirremp; /* previously referenced inode, if any */
|
|
{
|
|
int offset;
|
|
ufs_lbn_t lbn;
|
|
struct diradd *dap;
|
|
struct dirrem *dirrem;
|
|
struct pagedep *pagedep;
|
|
|
|
/*
|
|
* Whiteouts have no deletion dependencies.
|
|
*/
|
|
if (ip == NULL)
|
|
panic("newdirrem: whiteout");
|
|
/*
|
|
* If we are over our limit, try to improve the situation.
|
|
* Limiting the number of dirrem structures will also limit
|
|
* the number of freefile and freeblks structures.
|
|
*/
|
|
if (num_dirrem > max_softdeps / 2 && speedup_syncer() == 0)
|
|
(void) request_cleanup(FLUSH_REMOVE, 0);
|
|
num_dirrem += 1;
|
|
MALLOC(dirrem, struct dirrem *, sizeof(struct dirrem),
|
|
M_DIRREM, M_WAITOK);
|
|
bzero(dirrem, sizeof(struct dirrem));
|
|
dirrem->dm_list.wk_type = D_DIRREM;
|
|
dirrem->dm_state = isrmdir ? RMDIR : 0;
|
|
dirrem->dm_mnt = ITOV(ip)->v_mount;
|
|
dirrem->dm_oldinum = ip->i_number;
|
|
*prevdirremp = NULL;
|
|
|
|
ACQUIRE_LOCK(&lk);
|
|
lbn = lblkno(dp->i_fs, dp->i_offset);
|
|
offset = blkoff(dp->i_fs, dp->i_offset);
|
|
if (pagedep_lookup(dp, lbn, DEPALLOC, &pagedep) == 0)
|
|
WORKLIST_INSERT(&bp->b_dep, &pagedep->pd_list);
|
|
dirrem->dm_pagedep = pagedep;
|
|
/*
|
|
* Check for a diradd dependency for the same directory entry.
|
|
* If present, then both dependencies become obsolete and can
|
|
* be de-allocated. Check for an entry on both the pd_dirraddhd
|
|
* list and the pd_pendinghd list.
|
|
*/
|
|
for (dap = LIST_FIRST(&pagedep->pd_diraddhd[DIRADDHASH(offset)]);
|
|
dap; dap = LIST_NEXT(dap, da_pdlist))
|
|
if (dap->da_offset == offset)
|
|
break;
|
|
if (dap == NULL) {
|
|
for (dap = LIST_FIRST(&pagedep->pd_pendinghd);
|
|
dap; dap = LIST_NEXT(dap, da_pdlist))
|
|
if (dap->da_offset == offset)
|
|
break;
|
|
if (dap == NULL)
|
|
return (dirrem);
|
|
}
|
|
/*
|
|
* Must be ATTACHED at this point.
|
|
*/
|
|
if ((dap->da_state & ATTACHED) == 0)
|
|
panic("newdirrem: not ATTACHED");
|
|
if (dap->da_newinum != ip->i_number)
|
|
panic("newdirrem: inum %d should be %d",
|
|
ip->i_number, dap->da_newinum);
|
|
/*
|
|
* If we are deleting a changed name that never made it to disk,
|
|
* then return the dirrem describing the previous inode (which
|
|
* represents the inode currently referenced from this entry on disk).
|
|
*/
|
|
if ((dap->da_state & DIRCHG) != 0) {
|
|
*prevdirremp = dap->da_previous;
|
|
dap->da_state &= ~DIRCHG;
|
|
dap->da_pagedep = pagedep;
|
|
}
|
|
/*
|
|
* We are deleting an entry that never made it to disk.
|
|
* Mark it COMPLETE so we can delete its inode immediately.
|
|
*/
|
|
dirrem->dm_state |= COMPLETE;
|
|
free_diradd(dap);
|
|
return (dirrem);
|
|
}
|
|
|
|
/*
|
|
* Directory entry change dependencies.
|
|
*
|
|
* Changing an existing directory entry requires that an add operation
|
|
* be completed first followed by a deletion. The semantics for the addition
|
|
* are identical to the description of adding a new entry above except
|
|
* that the rollback is to the old inode number rather than zero. Once
|
|
* the addition dependency is completed, the removal is done as described
|
|
* in the removal routine above.
|
|
*/
|
|
|
|
/*
|
|
* This routine should be called immediately after changing
|
|
* a directory entry. The inode's link count should not be
|
|
* decremented by the calling procedure -- the soft updates
|
|
* code will perform this task when it is safe.
|
|
*/
|
|
void
|
|
softdep_setup_directory_change(bp, dp, ip, newinum, isrmdir)
|
|
struct buf *bp; /* buffer containing directory block */
|
|
struct inode *dp; /* inode for the directory being modified */
|
|
struct inode *ip; /* inode for directory entry being removed */
|
|
long newinum; /* new inode number for changed entry */
|
|
int isrmdir; /* indicates if doing RMDIR */
|
|
{
|
|
int offset;
|
|
struct diradd *dap = NULL;
|
|
struct dirrem *dirrem, *prevdirrem;
|
|
struct pagedep *pagedep;
|
|
struct inodedep *inodedep;
|
|
|
|
offset = blkoff(dp->i_fs, dp->i_offset);
|
|
|
|
/*
|
|
* Whiteouts do not need diradd dependencies.
|
|
*/
|
|
if (newinum != WINO) {
|
|
MALLOC(dap, struct diradd *, sizeof(struct diradd),
|
|
M_DIRADD, M_WAITOK);
|
|
bzero(dap, sizeof(struct diradd));
|
|
dap->da_list.wk_type = D_DIRADD;
|
|
dap->da_state = DIRCHG | ATTACHED | DEPCOMPLETE;
|
|
dap->da_offset = offset;
|
|
dap->da_newinum = newinum;
|
|
}
|
|
|
|
/*
|
|
* Allocate a new dirrem and ACQUIRE_LOCK.
|
|
*/
|
|
dirrem = newdirrem(bp, dp, ip, isrmdir, &prevdirrem);
|
|
pagedep = dirrem->dm_pagedep;
|
|
/*
|
|
* The possible values for isrmdir:
|
|
* 0 - non-directory file rename
|
|
* 1 - directory rename within same directory
|
|
* inum - directory rename to new directory of given inode number
|
|
* When renaming to a new directory, we are both deleting and
|
|
* creating a new directory entry, so the link count on the new
|
|
* directory should not change. Thus we do not need the followup
|
|
* dirrem which is usually done in handle_workitem_remove. We set
|
|
* the DIRCHG flag to tell handle_workitem_remove to skip the
|
|
* followup dirrem.
|
|
*/
|
|
if (isrmdir > 1)
|
|
dirrem->dm_state |= DIRCHG;
|
|
|
|
/*
|
|
* Whiteouts have no additional dependencies,
|
|
* so just put the dirrem on the correct list.
|
|
*/
|
|
if (newinum == WINO) {
|
|
if ((dirrem->dm_state & COMPLETE) == 0) {
|
|
LIST_INSERT_HEAD(&pagedep->pd_dirremhd, dirrem,
|
|
dm_next);
|
|
} else {
|
|
dirrem->dm_dirinum = pagedep->pd_ino;
|
|
add_to_worklist(&dirrem->dm_list);
|
|
}
|
|
FREE_LOCK(&lk);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If the COMPLETE flag is clear, then there were no active
|
|
* entries and we want to roll back to the previous inode until
|
|
* the new inode is committed to disk. If the COMPLETE flag is
|
|
* set, then we have deleted an entry that never made it to disk.
|
|
* If the entry we deleted resulted from a name change, then the old
|
|
* inode reference still resides on disk. Any rollback that we do
|
|
* needs to be to that old inode (returned to us in prevdirrem). If
|
|
* the entry we deleted resulted from a create, then there is
|
|
* no entry on the disk, so we want to roll back to zero rather
|
|
* than the uncommitted inode. In either of the COMPLETE cases we
|
|
* want to immediately free the unwritten and unreferenced inode.
|
|
*/
|
|
if ((dirrem->dm_state & COMPLETE) == 0) {
|
|
dap->da_previous = dirrem;
|
|
} else {
|
|
if (prevdirrem != NULL) {
|
|
dap->da_previous = prevdirrem;
|
|
} else {
|
|
dap->da_state &= ~DIRCHG;
|
|
dap->da_pagedep = pagedep;
|
|
}
|
|
dirrem->dm_dirinum = pagedep->pd_ino;
|
|
add_to_worklist(&dirrem->dm_list);
|
|
}
|
|
/*
|
|
* Link into its inodedep. Put it on the id_bufwait list if the inode
|
|
* is not yet written. If it is written, do the post-inode write
|
|
* processing to put it on the id_pendinghd list.
|
|
*/
|
|
if (inodedep_lookup(dp->i_fs, newinum, DEPALLOC, &inodedep) == 0 ||
|
|
(inodedep->id_state & ALLCOMPLETE) == ALLCOMPLETE) {
|
|
dap->da_state |= COMPLETE;
|
|
LIST_INSERT_HEAD(&pagedep->pd_pendinghd, dap, da_pdlist);
|
|
WORKLIST_INSERT(&inodedep->id_pendinghd, &dap->da_list);
|
|
} else {
|
|
LIST_INSERT_HEAD(&pagedep->pd_diraddhd[DIRADDHASH(offset)],
|
|
dap, da_pdlist);
|
|
WORKLIST_INSERT(&inodedep->id_bufwait, &dap->da_list);
|
|
}
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* Called whenever the link count on an inode is changed.
|
|
* It creates an inode dependency so that the new reference(s)
|
|
* to the inode cannot be committed to disk until the updated
|
|
* inode has been written.
|
|
*/
|
|
void
|
|
softdep_change_linkcnt(ip)
|
|
struct inode *ip; /* the inode with the increased link count */
|
|
{
|
|
struct inodedep *inodedep;
|
|
|
|
ACQUIRE_LOCK(&lk);
|
|
(void) inodedep_lookup(ip->i_fs, ip->i_number, DEPALLOC, &inodedep);
|
|
if (ip->i_nlink < ip->i_effnlink)
|
|
panic("softdep_change_linkcnt: bad delta");
|
|
inodedep->id_nlinkdelta = ip->i_nlink - ip->i_effnlink;
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* This workitem decrements the inode's link count.
|
|
* If the link count reaches zero, the file is removed.
|
|
*/
|
|
static void
|
|
handle_workitem_remove(dirrem)
|
|
struct dirrem *dirrem;
|
|
{
|
|
struct proc *p = CURPROC; /* XXX */
|
|
struct inodedep *inodedep;
|
|
struct vnode *vp;
|
|
struct inode *ip;
|
|
ino_t oldinum;
|
|
int error;
|
|
|
|
if ((error = VFS_VGET(dirrem->dm_mnt, dirrem->dm_oldinum, &vp)) != 0) {
|
|
softdep_error("handle_workitem_remove: vget", error);
|
|
return;
|
|
}
|
|
ip = VTOI(vp);
|
|
ACQUIRE_LOCK(&lk);
|
|
if ((inodedep_lookup(ip->i_fs, dirrem->dm_oldinum, 0, &inodedep)) == 0)
|
|
panic("handle_workitem_remove: lost inodedep");
|
|
/*
|
|
* Normal file deletion.
|
|
*/
|
|
if ((dirrem->dm_state & RMDIR) == 0) {
|
|
ip->i_nlink--;
|
|
ip->i_flag |= IN_CHANGE;
|
|
if (ip->i_nlink < ip->i_effnlink)
|
|
panic("handle_workitem_remove: bad file delta");
|
|
inodedep->id_nlinkdelta = ip->i_nlink - ip->i_effnlink;
|
|
FREE_LOCK(&lk);
|
|
vput(vp);
|
|
num_dirrem -= 1;
|
|
WORKITEM_FREE(dirrem, D_DIRREM);
|
|
return;
|
|
}
|
|
/*
|
|
* Directory deletion. Decrement reference count for both the
|
|
* just deleted parent directory entry and the reference for ".".
|
|
* Next truncate the directory to length zero. When the
|
|
* truncation completes, arrange to have the reference count on
|
|
* the parent decremented to account for the loss of "..".
|
|
*/
|
|
ip->i_nlink -= 2;
|
|
ip->i_flag |= IN_CHANGE;
|
|
if (ip->i_nlink < ip->i_effnlink)
|
|
panic("handle_workitem_remove: bad dir delta");
|
|
inodedep->id_nlinkdelta = ip->i_nlink - ip->i_effnlink;
|
|
FREE_LOCK(&lk);
|
|
if ((error = UFS_TRUNCATE(vp, (off_t)0, 0, p->p_ucred, p)) != 0)
|
|
softdep_error("handle_workitem_remove: truncate", error);
|
|
/*
|
|
* Rename a directory to a new parent. Since, we are both deleting
|
|
* and creating a new directory entry, the link count on the new
|
|
* directory should not change. Thus we skip the followup dirrem.
|
|
*/
|
|
if (dirrem->dm_state & DIRCHG) {
|
|
vput(vp);
|
|
num_dirrem -= 1;
|
|
WORKITEM_FREE(dirrem, D_DIRREM);
|
|
return;
|
|
}
|
|
/*
|
|
* If the inodedep does not exist, then the zero'ed inode has
|
|
* been written to disk. If the allocated inode has never been
|
|
* written to disk, then the on-disk inode is zero'ed. In either
|
|
* case we can remove the file immediately.
|
|
*/
|
|
ACQUIRE_LOCK(&lk);
|
|
dirrem->dm_state = 0;
|
|
oldinum = dirrem->dm_oldinum;
|
|
dirrem->dm_oldinum = dirrem->dm_dirinum;
|
|
if (inodedep_lookup(ip->i_fs, oldinum, 0, &inodedep) == 0 ||
|
|
check_inode_unwritten(inodedep)) {
|
|
FREE_LOCK(&lk);
|
|
vput(vp);
|
|
handle_workitem_remove(dirrem);
|
|
return;
|
|
}
|
|
WORKLIST_INSERT(&inodedep->id_inowait, &dirrem->dm_list);
|
|
FREE_LOCK(&lk);
|
|
vput(vp);
|
|
}
|
|
|
|
/*
|
|
* Inode de-allocation dependencies.
|
|
*
|
|
* When an inode's link count is reduced to zero, it can be de-allocated. We
|
|
* found it convenient to postpone de-allocation until after the inode is
|
|
* written to disk with its new link count (zero). At this point, all of the
|
|
* on-disk inode's block pointers are nullified and, with careful dependency
|
|
* list ordering, all dependencies related to the inode will be satisfied and
|
|
* the corresponding dependency structures de-allocated. So, if/when the
|
|
* inode is reused, there will be no mixing of old dependencies with new
|
|
* ones. This artificial dependency is set up by the block de-allocation
|
|
* procedure above (softdep_setup_freeblocks) and completed by the
|
|
* following procedure.
|
|
*/
|
|
static void
|
|
handle_workitem_freefile(freefile)
|
|
struct freefile *freefile;
|
|
{
|
|
struct vnode vp;
|
|
struct inode tip;
|
|
struct inodedep *idp;
|
|
int error;
|
|
|
|
#ifdef DEBUG
|
|
ACQUIRE_LOCK(&lk);
|
|
if (inodedep_lookup(freefile->fx_fs, freefile->fx_oldinum, 0, &idp))
|
|
panic("handle_workitem_freefile: inodedep survived");
|
|
FREE_LOCK(&lk);
|
|
#endif
|
|
tip.i_devvp = freefile->fx_devvp;
|
|
tip.i_dev = freefile->fx_devvp->v_rdev;
|
|
tip.i_fs = freefile->fx_fs;
|
|
vp.v_data = &tip;
|
|
if ((error = ffs_freefile(&vp, freefile->fx_oldinum, freefile->fx_mode)) != 0)
|
|
softdep_error("handle_workitem_freefile", error);
|
|
WORKITEM_FREE(freefile, D_FREEFILE);
|
|
}
|
|
|
|
/*
|
|
* Disk writes.
|
|
*
|
|
* The dependency structures constructed above are most actively used when file
|
|
* system blocks are written to disk. No constraints are placed on when a
|
|
* block can be written, but unsatisfied update dependencies are made safe by
|
|
* modifying (or replacing) the source memory for the duration of the disk
|
|
* write. When the disk write completes, the memory block is again brought
|
|
* up-to-date.
|
|
*
|
|
* In-core inode structure reclamation.
|
|
*
|
|
* Because there are a finite number of "in-core" inode structures, they are
|
|
* reused regularly. By transferring all inode-related dependencies to the
|
|
* in-memory inode block and indexing them separately (via "inodedep"s), we
|
|
* can allow "in-core" inode structures to be reused at any time and avoid
|
|
* any increase in contention.
|
|
*
|
|
* Called just before entering the device driver to initiate a new disk I/O.
|
|
* The buffer must be locked, thus, no I/O completion operations can occur
|
|
* while we are manipulating its associated dependencies.
|
|
*/
|
|
static void
|
|
softdep_disk_io_initiation(bp)
|
|
struct buf *bp; /* structure describing disk write to occur */
|
|
{
|
|
struct worklist *wk, *nextwk;
|
|
struct indirdep *indirdep;
|
|
|
|
/*
|
|
* We only care about write operations. There should never
|
|
* be dependencies for reads.
|
|
*/
|
|
if (bp->b_flags & B_READ)
|
|
panic("softdep_disk_io_initiation: read");
|
|
/*
|
|
* Do any necessary pre-I/O processing.
|
|
*/
|
|
for (wk = LIST_FIRST(&bp->b_dep); wk; wk = nextwk) {
|
|
nextwk = LIST_NEXT(wk, wk_list);
|
|
switch (wk->wk_type) {
|
|
|
|
case D_PAGEDEP:
|
|
initiate_write_filepage(WK_PAGEDEP(wk), bp);
|
|
continue;
|
|
|
|
case D_INODEDEP:
|
|
initiate_write_inodeblock(WK_INODEDEP(wk), bp);
|
|
continue;
|
|
|
|
case D_INDIRDEP:
|
|
indirdep = WK_INDIRDEP(wk);
|
|
if (indirdep->ir_state & GOINGAWAY)
|
|
panic("disk_io_initiation: indirdep gone");
|
|
/*
|
|
* If there are no remaining dependencies, this
|
|
* will be writing the real pointers, so the
|
|
* dependency can be freed.
|
|
*/
|
|
if (LIST_FIRST(&indirdep->ir_deplisthd) == NULL) {
|
|
indirdep->ir_savebp->b_flags |= B_INVAL | B_NOCACHE;
|
|
brelse(indirdep->ir_savebp);
|
|
/* inline expand WORKLIST_REMOVE(wk); */
|
|
wk->wk_state &= ~ONWORKLIST;
|
|
LIST_REMOVE(wk, wk_list);
|
|
WORKITEM_FREE(indirdep, D_INDIRDEP);
|
|
continue;
|
|
}
|
|
/*
|
|
* Replace up-to-date version with safe version.
|
|
*/
|
|
ACQUIRE_LOCK(&lk);
|
|
indirdep->ir_state &= ~ATTACHED;
|
|
indirdep->ir_state |= UNDONE;
|
|
MALLOC(indirdep->ir_saveddata, caddr_t, bp->b_bcount,
|
|
M_INDIRDEP, M_WAITOK);
|
|
bcopy(bp->b_data, indirdep->ir_saveddata, bp->b_bcount);
|
|
bcopy(indirdep->ir_savebp->b_data, bp->b_data,
|
|
bp->b_bcount);
|
|
FREE_LOCK(&lk);
|
|
continue;
|
|
|
|
case D_MKDIR:
|
|
case D_BMSAFEMAP:
|
|
case D_ALLOCDIRECT:
|
|
case D_ALLOCINDIR:
|
|
continue;
|
|
|
|
default:
|
|
panic("handle_disk_io_initiation: Unexpected type %s",
|
|
TYPENAME(wk->wk_type));
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Called from within the procedure above to deal with unsatisfied
|
|
* allocation dependencies in a directory. The buffer must be locked,
|
|
* thus, no I/O completion operations can occur while we are
|
|
* manipulating its associated dependencies.
|
|
*/
|
|
static void
|
|
initiate_write_filepage(pagedep, bp)
|
|
struct pagedep *pagedep;
|
|
struct buf *bp;
|
|
{
|
|
struct diradd *dap;
|
|
struct direct *ep;
|
|
int i;
|
|
|
|
if (pagedep->pd_state & IOSTARTED) {
|
|
/*
|
|
* This can only happen if there is a driver that does not
|
|
* understand chaining. Here biodone will reissue the call
|
|
* to strategy for the incomplete buffers.
|
|
*/
|
|
printf("initiate_write_filepage: already started\n");
|
|
return;
|
|
}
|
|
pagedep->pd_state |= IOSTARTED;
|
|
ACQUIRE_LOCK(&lk);
|
|
for (i = 0; i < DAHASHSZ; i++) {
|
|
for (dap = LIST_FIRST(&pagedep->pd_diraddhd[i]); dap;
|
|
dap = LIST_NEXT(dap, da_pdlist)) {
|
|
ep = (struct direct *)
|
|
((char *)bp->b_data + dap->da_offset);
|
|
if (ep->d_ino != dap->da_newinum)
|
|
panic("%s: dir inum %d != new %d",
|
|
"initiate_write_filepage",
|
|
ep->d_ino, dap->da_newinum);
|
|
if (dap->da_state & DIRCHG)
|
|
ep->d_ino = dap->da_previous->dm_oldinum;
|
|
else
|
|
ep->d_ino = 0;
|
|
dap->da_state &= ~ATTACHED;
|
|
dap->da_state |= UNDONE;
|
|
}
|
|
}
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* Called from within the procedure above to deal with unsatisfied
|
|
* allocation dependencies in an inodeblock. The buffer must be
|
|
* locked, thus, no I/O completion operations can occur while we
|
|
* are manipulating its associated dependencies.
|
|
*/
|
|
static void
|
|
initiate_write_inodeblock(inodedep, bp)
|
|
struct inodedep *inodedep;
|
|
struct buf *bp; /* The inode block */
|
|
{
|
|
struct allocdirect *adp, *lastadp;
|
|
struct dinode *dp;
|
|
struct fs *fs;
|
|
ufs_lbn_t prevlbn = 0;
|
|
int i, deplist;
|
|
|
|
if (inodedep->id_state & IOSTARTED)
|
|
panic("initiate_write_inodeblock: already started");
|
|
inodedep->id_state |= IOSTARTED;
|
|
fs = inodedep->id_fs;
|
|
dp = (struct dinode *)bp->b_data +
|
|
ino_to_fsbo(fs, inodedep->id_ino);
|
|
/*
|
|
* If the bitmap is not yet written, then the allocated
|
|
* inode cannot be written to disk.
|
|
*/
|
|
if ((inodedep->id_state & DEPCOMPLETE) == 0) {
|
|
if (inodedep->id_savedino != NULL)
|
|
panic("initiate_write_inodeblock: already doing I/O");
|
|
MALLOC(inodedep->id_savedino, struct dinode *,
|
|
sizeof(struct dinode), M_INODEDEP, M_WAITOK);
|
|
*inodedep->id_savedino = *dp;
|
|
bzero((caddr_t)dp, sizeof(struct dinode));
|
|
return;
|
|
}
|
|
/*
|
|
* If no dependencies, then there is nothing to roll back.
|
|
*/
|
|
inodedep->id_savedsize = dp->di_size;
|
|
if (TAILQ_FIRST(&inodedep->id_inoupdt) == NULL)
|
|
return;
|
|
/*
|
|
* Set the dependencies to busy.
|
|
*/
|
|
ACQUIRE_LOCK(&lk);
|
|
for (deplist = 0, adp = TAILQ_FIRST(&inodedep->id_inoupdt); adp;
|
|
adp = TAILQ_NEXT(adp, ad_next)) {
|
|
#ifdef DIAGNOSTIC
|
|
if (deplist != 0 && prevlbn >= adp->ad_lbn)
|
|
panic("softdep_write_inodeblock: lbn order");
|
|
prevlbn = adp->ad_lbn;
|
|
if (adp->ad_lbn < NDADDR &&
|
|
dp->di_db[adp->ad_lbn] != adp->ad_newblkno)
|
|
panic("%s: direct pointer #%ld mismatch %d != %d",
|
|
"softdep_write_inodeblock", adp->ad_lbn,
|
|
dp->di_db[adp->ad_lbn], adp->ad_newblkno);
|
|
if (adp->ad_lbn >= NDADDR &&
|
|
dp->di_ib[adp->ad_lbn - NDADDR] != adp->ad_newblkno)
|
|
panic("%s: indirect pointer #%ld mismatch %d != %d",
|
|
"softdep_write_inodeblock", adp->ad_lbn - NDADDR,
|
|
dp->di_ib[adp->ad_lbn - NDADDR], adp->ad_newblkno);
|
|
deplist |= 1 << adp->ad_lbn;
|
|
if ((adp->ad_state & ATTACHED) == 0)
|
|
panic("softdep_write_inodeblock: Unknown state 0x%x",
|
|
adp->ad_state);
|
|
#endif /* DIAGNOSTIC */
|
|
adp->ad_state &= ~ATTACHED;
|
|
adp->ad_state |= UNDONE;
|
|
}
|
|
/*
|
|
* The on-disk inode cannot claim to be any larger than the last
|
|
* fragment that has been written. Otherwise, the on-disk inode
|
|
* might have fragments that were not the last block in the file
|
|
* which would corrupt the filesystem.
|
|
*/
|
|
for (lastadp = NULL, adp = TAILQ_FIRST(&inodedep->id_inoupdt); adp;
|
|
lastadp = adp, adp = TAILQ_NEXT(adp, ad_next)) {
|
|
if (adp->ad_lbn >= NDADDR)
|
|
break;
|
|
dp->di_db[adp->ad_lbn] = adp->ad_oldblkno;
|
|
/* keep going until hitting a rollback to a frag */
|
|
if (adp->ad_oldsize == 0 || adp->ad_oldsize == fs->fs_bsize)
|
|
continue;
|
|
dp->di_size = fs->fs_bsize * adp->ad_lbn + adp->ad_oldsize;
|
|
for (i = adp->ad_lbn + 1; i < NDADDR; i++) {
|
|
#ifdef DIAGNOSTIC
|
|
if (dp->di_db[i] != 0 && (deplist & (1 << i)) == 0)
|
|
panic("softdep_write_inodeblock: lost dep1");
|
|
#endif /* DIAGNOSTIC */
|
|
dp->di_db[i] = 0;
|
|
}
|
|
for (i = 0; i < NIADDR; i++) {
|
|
#ifdef DIAGNOSTIC
|
|
if (dp->di_ib[i] != 0 &&
|
|
(deplist & ((1 << NDADDR) << i)) == 0)
|
|
panic("softdep_write_inodeblock: lost dep2");
|
|
#endif /* DIAGNOSTIC */
|
|
dp->di_ib[i] = 0;
|
|
}
|
|
FREE_LOCK(&lk);
|
|
return;
|
|
}
|
|
/*
|
|
* If we have zero'ed out the last allocated block of the file,
|
|
* roll back the size to the last currently allocated block.
|
|
* We know that this last allocated block is a full-sized as
|
|
* we already checked for fragments in the loop above.
|
|
*/
|
|
if (lastadp != NULL &&
|
|
dp->di_size <= (lastadp->ad_lbn + 1) * fs->fs_bsize) {
|
|
for (i = lastadp->ad_lbn; i >= 0; i--)
|
|
if (dp->di_db[i] != 0)
|
|
break;
|
|
dp->di_size = (i + 1) * fs->fs_bsize;
|
|
}
|
|
/*
|
|
* The only dependencies are for indirect blocks.
|
|
*
|
|
* The file size for indirect block additions is not guaranteed.
|
|
* Such a guarantee would be non-trivial to achieve. The conventional
|
|
* synchronous write implementation also does not make this guarantee.
|
|
* Fsck should catch and fix discrepancies. Arguably, the file size
|
|
* can be over-estimated without destroying integrity when the file
|
|
* moves into the indirect blocks (i.e., is large). If we want to
|
|
* postpone fsck, we are stuck with this argument.
|
|
*/
|
|
for (; adp; adp = TAILQ_NEXT(adp, ad_next))
|
|
dp->di_ib[adp->ad_lbn - NDADDR] = 0;
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* This routine is called during the completion interrupt
|
|
* service routine for a disk write (from the procedure called
|
|
* by the device driver to inform the file system caches of
|
|
* a request completion). It should be called early in this
|
|
* procedure, before the block is made available to other
|
|
* processes or other routines are called.
|
|
*/
|
|
static void
|
|
softdep_disk_write_complete(bp)
|
|
struct buf *bp; /* describes the completed disk write */
|
|
{
|
|
struct worklist *wk;
|
|
struct workhead reattach;
|
|
struct newblk *newblk;
|
|
struct allocindir *aip;
|
|
struct allocdirect *adp;
|
|
struct indirdep *indirdep;
|
|
struct inodedep *inodedep;
|
|
struct bmsafemap *bmsafemap;
|
|
|
|
#ifdef DEBUG
|
|
if (lk.lkt_held != -1)
|
|
panic("softdep_disk_write_complete: lock is held");
|
|
lk.lkt_held = -2;
|
|
#endif
|
|
LIST_INIT(&reattach);
|
|
while ((wk = LIST_FIRST(&bp->b_dep)) != NULL) {
|
|
WORKLIST_REMOVE(wk);
|
|
switch (wk->wk_type) {
|
|
|
|
case D_PAGEDEP:
|
|
if (handle_written_filepage(WK_PAGEDEP(wk), bp))
|
|
WORKLIST_INSERT(&reattach, wk);
|
|
continue;
|
|
|
|
case D_INODEDEP:
|
|
if (handle_written_inodeblock(WK_INODEDEP(wk), bp))
|
|
WORKLIST_INSERT(&reattach, wk);
|
|
continue;
|
|
|
|
case D_BMSAFEMAP:
|
|
bmsafemap = WK_BMSAFEMAP(wk);
|
|
while ((newblk = LIST_FIRST(&bmsafemap->sm_newblkhd))) {
|
|
newblk->nb_state |= DEPCOMPLETE;
|
|
newblk->nb_bmsafemap = NULL;
|
|
LIST_REMOVE(newblk, nb_deps);
|
|
}
|
|
while ((adp =
|
|
LIST_FIRST(&bmsafemap->sm_allocdirecthd))) {
|
|
adp->ad_state |= DEPCOMPLETE;
|
|
adp->ad_buf = NULL;
|
|
LIST_REMOVE(adp, ad_deps);
|
|
handle_allocdirect_partdone(adp);
|
|
}
|
|
while ((aip =
|
|
LIST_FIRST(&bmsafemap->sm_allocindirhd))) {
|
|
aip->ai_state |= DEPCOMPLETE;
|
|
aip->ai_buf = NULL;
|
|
LIST_REMOVE(aip, ai_deps);
|
|
handle_allocindir_partdone(aip);
|
|
}
|
|
while ((inodedep =
|
|
LIST_FIRST(&bmsafemap->sm_inodedephd)) != NULL) {
|
|
inodedep->id_state |= DEPCOMPLETE;
|
|
LIST_REMOVE(inodedep, id_deps);
|
|
inodedep->id_buf = NULL;
|
|
}
|
|
WORKITEM_FREE(bmsafemap, D_BMSAFEMAP);
|
|
continue;
|
|
|
|
case D_MKDIR:
|
|
handle_written_mkdir(WK_MKDIR(wk), MKDIR_BODY);
|
|
continue;
|
|
|
|
case D_ALLOCDIRECT:
|
|
adp = WK_ALLOCDIRECT(wk);
|
|
adp->ad_state |= COMPLETE;
|
|
handle_allocdirect_partdone(adp);
|
|
continue;
|
|
|
|
case D_ALLOCINDIR:
|
|
aip = WK_ALLOCINDIR(wk);
|
|
aip->ai_state |= COMPLETE;
|
|
handle_allocindir_partdone(aip);
|
|
continue;
|
|
|
|
case D_INDIRDEP:
|
|
indirdep = WK_INDIRDEP(wk);
|
|
if (indirdep->ir_state & GOINGAWAY)
|
|
panic("disk_write_complete: indirdep gone");
|
|
bcopy(indirdep->ir_saveddata, bp->b_data, bp->b_bcount);
|
|
FREE(indirdep->ir_saveddata, M_INDIRDEP);
|
|
indirdep->ir_saveddata = 0;
|
|
indirdep->ir_state &= ~UNDONE;
|
|
indirdep->ir_state |= ATTACHED;
|
|
while ((aip = LIST_FIRST(&indirdep->ir_donehd)) != 0) {
|
|
handle_allocindir_partdone(aip);
|
|
if (aip == LIST_FIRST(&indirdep->ir_donehd))
|
|
panic("disk_write_complete: not gone");
|
|
}
|
|
WORKLIST_INSERT(&reattach, wk);
|
|
if ((bp->b_flags & B_DELWRI) == 0)
|
|
stat_indir_blk_ptrs++;
|
|
bdirty(bp);
|
|
continue;
|
|
|
|
default:
|
|
panic("handle_disk_write_complete: Unknown type %s",
|
|
TYPENAME(wk->wk_type));
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
/*
|
|
* Reattach any requests that must be redone.
|
|
*/
|
|
while ((wk = LIST_FIRST(&reattach)) != NULL) {
|
|
WORKLIST_REMOVE(wk);
|
|
WORKLIST_INSERT(&bp->b_dep, wk);
|
|
}
|
|
#ifdef DEBUG
|
|
if (lk.lkt_held != -2)
|
|
panic("softdep_disk_write_complete: lock lost");
|
|
lk.lkt_held = -1;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Called from within softdep_disk_write_complete above. Note that
|
|
* this routine is always called from interrupt level with further
|
|
* splbio interrupts blocked.
|
|
*/
|
|
static void
|
|
handle_allocdirect_partdone(adp)
|
|
struct allocdirect *adp; /* the completed allocdirect */
|
|
{
|
|
struct allocdirect *listadp;
|
|
struct inodedep *inodedep;
|
|
long bsize;
|
|
|
|
if ((adp->ad_state & ALLCOMPLETE) != ALLCOMPLETE)
|
|
return;
|
|
if (adp->ad_buf != NULL)
|
|
panic("handle_allocdirect_partdone: dangling dep");
|
|
/*
|
|
* The on-disk inode cannot claim to be any larger than the last
|
|
* fragment that has been written. Otherwise, the on-disk inode
|
|
* might have fragments that were not the last block in the file
|
|
* which would corrupt the filesystem. Thus, we cannot free any
|
|
* allocdirects after one whose ad_oldblkno claims a fragment as
|
|
* these blocks must be rolled back to zero before writing the inode.
|
|
* We check the currently active set of allocdirects in id_inoupdt.
|
|
*/
|
|
inodedep = adp->ad_inodedep;
|
|
bsize = inodedep->id_fs->fs_bsize;
|
|
for (listadp = TAILQ_FIRST(&inodedep->id_inoupdt); listadp;
|
|
listadp = TAILQ_NEXT(listadp, ad_next)) {
|
|
/* found our block */
|
|
if (listadp == adp)
|
|
break;
|
|
/* continue if ad_oldlbn is not a fragment */
|
|
if (listadp->ad_oldsize == 0 ||
|
|
listadp->ad_oldsize == bsize)
|
|
continue;
|
|
/* hit a fragment */
|
|
return;
|
|
}
|
|
/*
|
|
* If we have reached the end of the current list without
|
|
* finding the just finished dependency, then it must be
|
|
* on the future dependency list. Future dependencies cannot
|
|
* be freed until they are moved to the current list.
|
|
*/
|
|
if (listadp == NULL) {
|
|
#ifdef DEBUG
|
|
for (listadp = TAILQ_FIRST(&inodedep->id_newinoupdt); listadp;
|
|
listadp = TAILQ_NEXT(listadp, ad_next))
|
|
/* found our block */
|
|
if (listadp == adp)
|
|
break;
|
|
if (listadp == NULL)
|
|
panic("handle_allocdirect_partdone: lost dep");
|
|
#endif /* DEBUG */
|
|
return;
|
|
}
|
|
/*
|
|
* If we have found the just finished dependency, then free
|
|
* it along with anything that follows it that is complete.
|
|
*/
|
|
for (; adp; adp = listadp) {
|
|
listadp = TAILQ_NEXT(adp, ad_next);
|
|
if ((adp->ad_state & ALLCOMPLETE) != ALLCOMPLETE)
|
|
return;
|
|
free_allocdirect(&inodedep->id_inoupdt, adp, 1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Called from within softdep_disk_write_complete above. Note that
|
|
* this routine is always called from interrupt level with further
|
|
* splbio interrupts blocked.
|
|
*/
|
|
static void
|
|
handle_allocindir_partdone(aip)
|
|
struct allocindir *aip; /* the completed allocindir */
|
|
{
|
|
struct indirdep *indirdep;
|
|
|
|
if ((aip->ai_state & ALLCOMPLETE) != ALLCOMPLETE)
|
|
return;
|
|
if (aip->ai_buf != NULL)
|
|
panic("handle_allocindir_partdone: dangling dependency");
|
|
indirdep = aip->ai_indirdep;
|
|
if (indirdep->ir_state & UNDONE) {
|
|
LIST_REMOVE(aip, ai_next);
|
|
LIST_INSERT_HEAD(&indirdep->ir_donehd, aip, ai_next);
|
|
return;
|
|
}
|
|
((ufs_daddr_t *)indirdep->ir_savebp->b_data)[aip->ai_offset] =
|
|
aip->ai_newblkno;
|
|
LIST_REMOVE(aip, ai_next);
|
|
if (aip->ai_freefrag != NULL)
|
|
add_to_worklist(&aip->ai_freefrag->ff_list);
|
|
WORKITEM_FREE(aip, D_ALLOCINDIR);
|
|
}
|
|
|
|
/*
|
|
* Called from within softdep_disk_write_complete above to restore
|
|
* in-memory inode block contents to their most up-to-date state. Note
|
|
* that this routine is always called from interrupt level with further
|
|
* splbio interrupts blocked.
|
|
*/
|
|
static int
|
|
handle_written_inodeblock(inodedep, bp)
|
|
struct inodedep *inodedep;
|
|
struct buf *bp; /* buffer containing the inode block */
|
|
{
|
|
struct worklist *wk, *filefree;
|
|
struct allocdirect *adp, *nextadp;
|
|
struct dinode *dp;
|
|
int hadchanges;
|
|
|
|
if ((inodedep->id_state & IOSTARTED) == 0)
|
|
panic("handle_written_inodeblock: not started");
|
|
inodedep->id_state &= ~IOSTARTED;
|
|
inodedep->id_state |= COMPLETE;
|
|
dp = (struct dinode *)bp->b_data +
|
|
ino_to_fsbo(inodedep->id_fs, inodedep->id_ino);
|
|
/*
|
|
* If we had to rollback the inode allocation because of
|
|
* bitmaps being incomplete, then simply restore it.
|
|
* Keep the block dirty so that it will not be reclaimed until
|
|
* all associated dependencies have been cleared and the
|
|
* corresponding updates written to disk.
|
|
*/
|
|
if (inodedep->id_savedino != NULL) {
|
|
*dp = *inodedep->id_savedino;
|
|
FREE(inodedep->id_savedino, M_INODEDEP);
|
|
inodedep->id_savedino = NULL;
|
|
if ((bp->b_flags & B_DELWRI) == 0)
|
|
stat_inode_bitmap++;
|
|
bdirty(bp);
|
|
return (1);
|
|
}
|
|
/*
|
|
* Roll forward anything that had to be rolled back before
|
|
* the inode could be updated.
|
|
*/
|
|
hadchanges = 0;
|
|
for (adp = TAILQ_FIRST(&inodedep->id_inoupdt); adp; adp = nextadp) {
|
|
nextadp = TAILQ_NEXT(adp, ad_next);
|
|
if (adp->ad_state & ATTACHED)
|
|
panic("handle_written_inodeblock: new entry");
|
|
if (adp->ad_lbn < NDADDR) {
|
|
if (dp->di_db[adp->ad_lbn] != adp->ad_oldblkno)
|
|
panic("%s: %s #%ld mismatch %d != %d",
|
|
"handle_written_inodeblock",
|
|
"direct pointer", adp->ad_lbn,
|
|
dp->di_db[adp->ad_lbn], adp->ad_oldblkno);
|
|
dp->di_db[adp->ad_lbn] = adp->ad_newblkno;
|
|
} else {
|
|
if (dp->di_ib[adp->ad_lbn - NDADDR] != 0)
|
|
panic("%s: %s #%ld allocated as %d",
|
|
"handle_written_inodeblock",
|
|
"indirect pointer", adp->ad_lbn - NDADDR,
|
|
dp->di_ib[adp->ad_lbn - NDADDR]);
|
|
dp->di_ib[adp->ad_lbn - NDADDR] = adp->ad_newblkno;
|
|
}
|
|
adp->ad_state &= ~UNDONE;
|
|
adp->ad_state |= ATTACHED;
|
|
hadchanges = 1;
|
|
}
|
|
if (hadchanges && (bp->b_flags & B_DELWRI) == 0)
|
|
stat_direct_blk_ptrs++;
|
|
/*
|
|
* Reset the file size to its most up-to-date value.
|
|
*/
|
|
if (inodedep->id_savedsize == -1)
|
|
panic("handle_written_inodeblock: bad size");
|
|
if (dp->di_size != inodedep->id_savedsize) {
|
|
dp->di_size = inodedep->id_savedsize;
|
|
hadchanges = 1;
|
|
}
|
|
inodedep->id_savedsize = -1;
|
|
/*
|
|
* If there were any rollbacks in the inode block, then it must be
|
|
* marked dirty so that its will eventually get written back in
|
|
* its correct form.
|
|
*/
|
|
if (hadchanges)
|
|
bdirty(bp);
|
|
/*
|
|
* Process any allocdirects that completed during the update.
|
|
*/
|
|
if ((adp = TAILQ_FIRST(&inodedep->id_inoupdt)) != NULL)
|
|
handle_allocdirect_partdone(adp);
|
|
/*
|
|
* Process deallocations that were held pending until the
|
|
* inode had been written to disk. Freeing of the inode
|
|
* is delayed until after all blocks have been freed to
|
|
* avoid creation of new <vfsid, inum, lbn> triples
|
|
* before the old ones have been deleted.
|
|
*/
|
|
filefree = NULL;
|
|
while ((wk = LIST_FIRST(&inodedep->id_bufwait)) != NULL) {
|
|
WORKLIST_REMOVE(wk);
|
|
switch (wk->wk_type) {
|
|
|
|
case D_FREEFILE:
|
|
/*
|
|
* We defer adding filefree to the worklist until
|
|
* all other additions have been made to ensure
|
|
* that it will be done after all the old blocks
|
|
* have been freed.
|
|
*/
|
|
if (filefree != NULL)
|
|
panic("handle_written_inodeblock: filefree");
|
|
filefree = wk;
|
|
continue;
|
|
|
|
case D_MKDIR:
|
|
handle_written_mkdir(WK_MKDIR(wk), MKDIR_PARENT);
|
|
continue;
|
|
|
|
case D_DIRADD:
|
|
diradd_inode_written(WK_DIRADD(wk), inodedep);
|
|
continue;
|
|
|
|
case D_FREEBLKS:
|
|
case D_FREEFRAG:
|
|
case D_DIRREM:
|
|
add_to_worklist(wk);
|
|
continue;
|
|
|
|
default:
|
|
panic("handle_written_inodeblock: Unknown type %s",
|
|
TYPENAME(wk->wk_type));
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
if (filefree != NULL) {
|
|
if (free_inodedep(inodedep) == 0)
|
|
panic("handle_written_inodeblock: live inodedep");
|
|
add_to_worklist(filefree);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* If no outstanding dependencies, free it.
|
|
*/
|
|
if (free_inodedep(inodedep) || TAILQ_FIRST(&inodedep->id_inoupdt) == 0)
|
|
return (0);
|
|
return (hadchanges);
|
|
}
|
|
|
|
/*
|
|
* Process a diradd entry after its dependent inode has been written.
|
|
* This routine must be called with splbio interrupts blocked.
|
|
*/
|
|
static void
|
|
diradd_inode_written(dap, inodedep)
|
|
struct diradd *dap;
|
|
struct inodedep *inodedep;
|
|
{
|
|
struct pagedep *pagedep;
|
|
|
|
dap->da_state |= COMPLETE;
|
|
if ((dap->da_state & ALLCOMPLETE) == ALLCOMPLETE) {
|
|
if (dap->da_state & DIRCHG)
|
|
pagedep = dap->da_previous->dm_pagedep;
|
|
else
|
|
pagedep = dap->da_pagedep;
|
|
LIST_REMOVE(dap, da_pdlist);
|
|
LIST_INSERT_HEAD(&pagedep->pd_pendinghd, dap, da_pdlist);
|
|
}
|
|
WORKLIST_INSERT(&inodedep->id_pendinghd, &dap->da_list);
|
|
}
|
|
|
|
/*
|
|
* Handle the completion of a mkdir dependency.
|
|
*/
|
|
static void
|
|
handle_written_mkdir(mkdir, type)
|
|
struct mkdir *mkdir;
|
|
int type;
|
|
{
|
|
struct diradd *dap;
|
|
struct pagedep *pagedep;
|
|
|
|
if (mkdir->md_state != type)
|
|
panic("handle_written_mkdir: bad type");
|
|
dap = mkdir->md_diradd;
|
|
dap->da_state &= ~type;
|
|
if ((dap->da_state & (MKDIR_PARENT | MKDIR_BODY)) == 0)
|
|
dap->da_state |= DEPCOMPLETE;
|
|
if ((dap->da_state & ALLCOMPLETE) == ALLCOMPLETE) {
|
|
if (dap->da_state & DIRCHG)
|
|
pagedep = dap->da_previous->dm_pagedep;
|
|
else
|
|
pagedep = dap->da_pagedep;
|
|
LIST_REMOVE(dap, da_pdlist);
|
|
LIST_INSERT_HEAD(&pagedep->pd_pendinghd, dap, da_pdlist);
|
|
}
|
|
LIST_REMOVE(mkdir, md_mkdirs);
|
|
WORKITEM_FREE(mkdir, D_MKDIR);
|
|
}
|
|
|
|
/*
|
|
* Called from within softdep_disk_write_complete above.
|
|
* A write operation was just completed. Removed inodes can
|
|
* now be freed and associated block pointers may be committed.
|
|
* Note that this routine is always called from interrupt level
|
|
* with further splbio interrupts blocked.
|
|
*/
|
|
static int
|
|
handle_written_filepage(pagedep, bp)
|
|
struct pagedep *pagedep;
|
|
struct buf *bp; /* buffer containing the written page */
|
|
{
|
|
struct dirrem *dirrem;
|
|
struct diradd *dap, *nextdap;
|
|
struct direct *ep;
|
|
int i, chgs;
|
|
|
|
if ((pagedep->pd_state & IOSTARTED) == 0)
|
|
panic("handle_written_filepage: not started");
|
|
pagedep->pd_state &= ~IOSTARTED;
|
|
/*
|
|
* Process any directory removals that have been committed.
|
|
*/
|
|
while ((dirrem = LIST_FIRST(&pagedep->pd_dirremhd)) != NULL) {
|
|
LIST_REMOVE(dirrem, dm_next);
|
|
dirrem->dm_dirinum = pagedep->pd_ino;
|
|
add_to_worklist(&dirrem->dm_list);
|
|
}
|
|
/*
|
|
* Free any directory additions that have been committed.
|
|
*/
|
|
while ((dap = LIST_FIRST(&pagedep->pd_pendinghd)) != NULL)
|
|
free_diradd(dap);
|
|
/*
|
|
* Uncommitted directory entries must be restored.
|
|
*/
|
|
for (chgs = 0, i = 0; i < DAHASHSZ; i++) {
|
|
for (dap = LIST_FIRST(&pagedep->pd_diraddhd[i]); dap;
|
|
dap = nextdap) {
|
|
nextdap = LIST_NEXT(dap, da_pdlist);
|
|
if (dap->da_state & ATTACHED)
|
|
panic("handle_written_filepage: attached");
|
|
ep = (struct direct *)
|
|
((char *)bp->b_data + dap->da_offset);
|
|
ep->d_ino = dap->da_newinum;
|
|
dap->da_state &= ~UNDONE;
|
|
dap->da_state |= ATTACHED;
|
|
chgs = 1;
|
|
/*
|
|
* If the inode referenced by the directory has
|
|
* been written out, then the dependency can be
|
|
* moved to the pending list.
|
|
*/
|
|
if ((dap->da_state & ALLCOMPLETE) == ALLCOMPLETE) {
|
|
LIST_REMOVE(dap, da_pdlist);
|
|
LIST_INSERT_HEAD(&pagedep->pd_pendinghd, dap,
|
|
da_pdlist);
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* If there were any rollbacks in the directory, then it must be
|
|
* marked dirty so that its will eventually get written back in
|
|
* its correct form.
|
|
*/
|
|
if (chgs) {
|
|
if ((bp->b_flags & B_DELWRI) == 0)
|
|
stat_dir_entry++;
|
|
bdirty(bp);
|
|
}
|
|
/*
|
|
* If no dependencies remain, the pagedep will be freed.
|
|
* Otherwise it will remain to update the page before it
|
|
* is written back to disk.
|
|
*/
|
|
if (LIST_FIRST(&pagedep->pd_pendinghd) == 0) {
|
|
for (i = 0; i < DAHASHSZ; i++)
|
|
if (LIST_FIRST(&pagedep->pd_diraddhd[i]) != NULL)
|
|
break;
|
|
if (i == DAHASHSZ) {
|
|
LIST_REMOVE(pagedep, pd_hash);
|
|
WORKITEM_FREE(pagedep, D_PAGEDEP);
|
|
return (0);
|
|
}
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Writing back in-core inode structures.
|
|
*
|
|
* The file system only accesses an inode's contents when it occupies an
|
|
* "in-core" inode structure. These "in-core" structures are separate from
|
|
* the page frames used to cache inode blocks. Only the latter are
|
|
* transferred to/from the disk. So, when the updated contents of the
|
|
* "in-core" inode structure are copied to the corresponding in-memory inode
|
|
* block, the dependencies are also transferred. The following procedure is
|
|
* called when copying a dirty "in-core" inode to a cached inode block.
|
|
*/
|
|
|
|
/*
|
|
* Called when an inode is loaded from disk. If the effective link count
|
|
* differed from the actual link count when it was last flushed, then we
|
|
* need to ensure that the correct effective link count is put back.
|
|
*/
|
|
void
|
|
softdep_load_inodeblock(ip)
|
|
struct inode *ip; /* the "in_core" copy of the inode */
|
|
{
|
|
struct inodedep *inodedep;
|
|
|
|
/*
|
|
* Check for alternate nlink count.
|
|
*/
|
|
ip->i_effnlink = ip->i_nlink;
|
|
ACQUIRE_LOCK(&lk);
|
|
if (inodedep_lookup(ip->i_fs, ip->i_number, 0, &inodedep) == 0) {
|
|
FREE_LOCK(&lk);
|
|
return;
|
|
}
|
|
ip->i_effnlink -= inodedep->id_nlinkdelta;
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* This routine is called just before the "in-core" inode
|
|
* information is to be copied to the in-memory inode block.
|
|
* Recall that an inode block contains several inodes. If
|
|
* the force flag is set, then the dependencies will be
|
|
* cleared so that the update can always be made. Note that
|
|
* the buffer is locked when this routine is called, so we
|
|
* will never be in the middle of writing the inode block
|
|
* to disk.
|
|
*/
|
|
void
|
|
softdep_update_inodeblock(ip, bp, waitfor)
|
|
struct inode *ip; /* the "in_core" copy of the inode */
|
|
struct buf *bp; /* the buffer containing the inode block */
|
|
int waitfor; /* nonzero => update must be allowed */
|
|
{
|
|
struct inodedep *inodedep;
|
|
struct worklist *wk;
|
|
int error, gotit;
|
|
|
|
/*
|
|
* If the effective link count is not equal to the actual link
|
|
* count, then we must track the difference in an inodedep while
|
|
* the inode is (potentially) tossed out of the cache. Otherwise,
|
|
* if there is no existing inodedep, then there are no dependencies
|
|
* to track.
|
|
*/
|
|
ACQUIRE_LOCK(&lk);
|
|
if (inodedep_lookup(ip->i_fs, ip->i_number, 0, &inodedep) == 0) {
|
|
if (ip->i_effnlink != ip->i_nlink)
|
|
panic("softdep_update_inodeblock: bad link count");
|
|
FREE_LOCK(&lk);
|
|
return;
|
|
}
|
|
if (inodedep->id_nlinkdelta != ip->i_nlink - ip->i_effnlink)
|
|
panic("softdep_update_inodeblock: bad delta");
|
|
/*
|
|
* Changes have been initiated. Anything depending on these
|
|
* changes cannot occur until this inode has been written.
|
|
*/
|
|
inodedep->id_state &= ~COMPLETE;
|
|
if ((inodedep->id_state & ONWORKLIST) == 0)
|
|
WORKLIST_INSERT(&bp->b_dep, &inodedep->id_list);
|
|
/*
|
|
* Any new dependencies associated with the incore inode must
|
|
* now be moved to the list associated with the buffer holding
|
|
* the in-memory copy of the inode. Once merged process any
|
|
* allocdirects that are completed by the merger.
|
|
*/
|
|
merge_inode_lists(inodedep);
|
|
if (TAILQ_FIRST(&inodedep->id_inoupdt) != NULL)
|
|
handle_allocdirect_partdone(TAILQ_FIRST(&inodedep->id_inoupdt));
|
|
/*
|
|
* Now that the inode has been pushed into the buffer, the
|
|
* operations dependent on the inode being written to disk
|
|
* can be moved to the id_bufwait so that they will be
|
|
* processed when the buffer I/O completes.
|
|
*/
|
|
while ((wk = LIST_FIRST(&inodedep->id_inowait)) != NULL) {
|
|
WORKLIST_REMOVE(wk);
|
|
WORKLIST_INSERT(&inodedep->id_bufwait, wk);
|
|
}
|
|
/*
|
|
* Newly allocated inodes cannot be written until the bitmap
|
|
* that allocates them have been written (indicated by
|
|
* DEPCOMPLETE being set in id_state). If we are doing a
|
|
* forced sync (e.g., an fsync on a file), we force the bitmap
|
|
* to be written so that the update can be done.
|
|
*/
|
|
if ((inodedep->id_state & DEPCOMPLETE) != 0 || waitfor == 0) {
|
|
FREE_LOCK(&lk);
|
|
return;
|
|
}
|
|
gotit = getdirtybuf(&inodedep->id_buf, MNT_WAIT);
|
|
FREE_LOCK(&lk);
|
|
if (gotit &&
|
|
(error = VOP_BWRITE(inodedep->id_buf->b_vp, inodedep->id_buf)) != 0)
|
|
softdep_error("softdep_update_inodeblock: bwrite", error);
|
|
if ((inodedep->id_state & DEPCOMPLETE) == 0)
|
|
panic("softdep_update_inodeblock: update failed");
|
|
}
|
|
|
|
/*
|
|
* Merge the new inode dependency list (id_newinoupdt) into the old
|
|
* inode dependency list (id_inoupdt). This routine must be called
|
|
* with splbio interrupts blocked.
|
|
*/
|
|
static void
|
|
merge_inode_lists(inodedep)
|
|
struct inodedep *inodedep;
|
|
{
|
|
struct allocdirect *listadp, *newadp;
|
|
|
|
newadp = TAILQ_FIRST(&inodedep->id_newinoupdt);
|
|
for (listadp = TAILQ_FIRST(&inodedep->id_inoupdt); listadp && newadp;) {
|
|
if (listadp->ad_lbn < newadp->ad_lbn) {
|
|
listadp = TAILQ_NEXT(listadp, ad_next);
|
|
continue;
|
|
}
|
|
TAILQ_REMOVE(&inodedep->id_newinoupdt, newadp, ad_next);
|
|
TAILQ_INSERT_BEFORE(listadp, newadp, ad_next);
|
|
if (listadp->ad_lbn == newadp->ad_lbn) {
|
|
allocdirect_merge(&inodedep->id_inoupdt, newadp,
|
|
listadp);
|
|
listadp = newadp;
|
|
}
|
|
newadp = TAILQ_FIRST(&inodedep->id_newinoupdt);
|
|
}
|
|
while ((newadp = TAILQ_FIRST(&inodedep->id_newinoupdt)) != NULL) {
|
|
TAILQ_REMOVE(&inodedep->id_newinoupdt, newadp, ad_next);
|
|
TAILQ_INSERT_TAIL(&inodedep->id_inoupdt, newadp, ad_next);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we are doing an fsync, then we must ensure that any directory
|
|
* entries for the inode have been written after the inode gets to disk.
|
|
*/
|
|
static int
|
|
softdep_fsync(vp)
|
|
struct vnode *vp; /* the "in_core" copy of the inode */
|
|
{
|
|
struct inodedep *inodedep;
|
|
struct pagedep *pagedep;
|
|
struct worklist *wk;
|
|
struct diradd *dap;
|
|
struct mount *mnt;
|
|
struct vnode *pvp;
|
|
struct inode *ip;
|
|
struct buf *bp;
|
|
struct fs *fs;
|
|
struct proc *p = CURPROC; /* XXX */
|
|
int error, flushparent;
|
|
ino_t parentino;
|
|
ufs_lbn_t lbn;
|
|
|
|
ip = VTOI(vp);
|
|
fs = ip->i_fs;
|
|
ACQUIRE_LOCK(&lk);
|
|
if (inodedep_lookup(fs, ip->i_number, 0, &inodedep) == 0) {
|
|
FREE_LOCK(&lk);
|
|
return (0);
|
|
}
|
|
if (LIST_FIRST(&inodedep->id_inowait) != NULL ||
|
|
LIST_FIRST(&inodedep->id_bufwait) != NULL ||
|
|
TAILQ_FIRST(&inodedep->id_inoupdt) != NULL ||
|
|
TAILQ_FIRST(&inodedep->id_newinoupdt) != NULL)
|
|
panic("softdep_fsync: pending ops");
|
|
for (error = 0, flushparent = 0; ; ) {
|
|
if ((wk = LIST_FIRST(&inodedep->id_pendinghd)) == NULL)
|
|
break;
|
|
if (wk->wk_type != D_DIRADD)
|
|
panic("softdep_fsync: Unexpected type %s",
|
|
TYPENAME(wk->wk_type));
|
|
dap = WK_DIRADD(wk);
|
|
/*
|
|
* Flush our parent if this directory entry
|
|
* has a MKDIR_PARENT dependency.
|
|
*/
|
|
if (dap->da_state & DIRCHG)
|
|
pagedep = dap->da_previous->dm_pagedep;
|
|
else
|
|
pagedep = dap->da_pagedep;
|
|
mnt = pagedep->pd_mnt;
|
|
parentino = pagedep->pd_ino;
|
|
lbn = pagedep->pd_lbn;
|
|
if ((dap->da_state & (MKDIR_BODY | COMPLETE)) != COMPLETE)
|
|
panic("softdep_fsync: dirty");
|
|
flushparent = dap->da_state & MKDIR_PARENT;
|
|
/*
|
|
* If we are being fsync'ed as part of vgone'ing this vnode,
|
|
* then we will not be able to release and recover the
|
|
* vnode below, so we just have to give up on writing its
|
|
* directory entry out. It will eventually be written, just
|
|
* not now, but then the user was not asking to have it
|
|
* written, so we are not breaking any promises.
|
|
*/
|
|
if (vp->v_flag & VXLOCK)
|
|
break;
|
|
/*
|
|
* We prevent deadlock by always fetching inodes from the
|
|
* root, moving down the directory tree. Thus, when fetching
|
|
* our parent directory, we must unlock ourselves before
|
|
* requesting the lock on our parent. See the comment in
|
|
* ufs_lookup for details on possible races.
|
|
*/
|
|
FREE_LOCK(&lk);
|
|
VOP_UNLOCK(vp, 0, p);
|
|
error = VFS_VGET(mnt, parentino, &pvp);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
|
|
if (error != 0)
|
|
return (error);
|
|
if (flushparent) {
|
|
if ((error = UFS_UPDATE(pvp, 1)) != 0) {
|
|
vput(pvp);
|
|
return (error);
|
|
}
|
|
}
|
|
/*
|
|
* Flush directory page containing the inode's name.
|
|
*/
|
|
error = bread(pvp, lbn, blksize(fs, VTOI(pvp), lbn), p->p_ucred,
|
|
&bp);
|
|
if (error == 0)
|
|
error = VOP_BWRITE(bp->b_vp, bp);
|
|
vput(pvp);
|
|
if (error != 0)
|
|
return (error);
|
|
ACQUIRE_LOCK(&lk);
|
|
if (inodedep_lookup(fs, ip->i_number, 0, &inodedep) == 0)
|
|
break;
|
|
}
|
|
FREE_LOCK(&lk);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Flush all the dirty bitmaps associated with the block device
|
|
* before flushing the rest of the dirty blocks so as to reduce
|
|
* the number of dependencies that will have to be rolled back.
|
|
*/
|
|
void
|
|
softdep_fsync_mountdev(vp)
|
|
struct vnode *vp;
|
|
{
|
|
struct buf *bp, *nbp;
|
|
struct worklist *wk;
|
|
|
|
if (!vn_isdisk(vp, NULL))
|
|
panic("softdep_fsync_mountdev: vnode not a disk");
|
|
ACQUIRE_LOCK(&lk);
|
|
for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
|
|
nbp = TAILQ_NEXT(bp, b_vnbufs);
|
|
/*
|
|
* If it is already scheduled, skip to the next buffer.
|
|
*/
|
|
if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT))
|
|
continue;
|
|
if ((bp->b_flags & B_DELWRI) == 0)
|
|
panic("softdep_fsync_mountdev: not dirty");
|
|
/*
|
|
* We are only interested in bitmaps with outstanding
|
|
* dependencies.
|
|
*/
|
|
if ((wk = LIST_FIRST(&bp->b_dep)) == NULL ||
|
|
wk->wk_type != D_BMSAFEMAP ||
|
|
(bp->b_xflags & BX_BKGRDINPROG)) {
|
|
BUF_UNLOCK(bp);
|
|
continue;
|
|
}
|
|
bremfree(bp);
|
|
FREE_LOCK(&lk);
|
|
(void) bawrite(bp);
|
|
ACQUIRE_LOCK(&lk);
|
|
/*
|
|
* Since we may have slept during the I/O, we need
|
|
* to start from a known point.
|
|
*/
|
|
nbp = TAILQ_FIRST(&vp->v_dirtyblkhd);
|
|
}
|
|
drain_output(vp, 1);
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* This routine is called when we are trying to synchronously flush a
|
|
* file. This routine must eliminate any filesystem metadata dependencies
|
|
* so that the syncing routine can succeed by pushing the dirty blocks
|
|
* associated with the file. If any I/O errors occur, they are returned.
|
|
*/
|
|
int
|
|
softdep_sync_metadata(ap)
|
|
struct vop_fsync_args /* {
|
|
struct vnode *a_vp;
|
|
struct ucred *a_cred;
|
|
int a_waitfor;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct pagedep *pagedep;
|
|
struct allocdirect *adp;
|
|
struct allocindir *aip;
|
|
struct buf *bp, *nbp;
|
|
struct worklist *wk;
|
|
int i, error, waitfor;
|
|
|
|
/*
|
|
* Check whether this vnode is involved in a filesystem
|
|
* that is doing soft dependency processing.
|
|
*/
|
|
if (!vn_isdisk(vp, NULL)) {
|
|
if (!DOINGSOFTDEP(vp))
|
|
return (0);
|
|
} else
|
|
if (vp->v_specmountpoint == NULL ||
|
|
(vp->v_specmountpoint->mnt_flag & MNT_SOFTDEP) == 0)
|
|
return (0);
|
|
/*
|
|
* Ensure that any direct block dependencies have been cleared.
|
|
*/
|
|
ACQUIRE_LOCK(&lk);
|
|
if ((error = flush_inodedep_deps(VTOI(vp)->i_fs, VTOI(vp)->i_number))) {
|
|
FREE_LOCK(&lk);
|
|
return (error);
|
|
}
|
|
/*
|
|
* For most files, the only metadata dependencies are the
|
|
* cylinder group maps that allocate their inode or blocks.
|
|
* The block allocation dependencies can be found by traversing
|
|
* the dependency lists for any buffers that remain on their
|
|
* dirty buffer list. The inode allocation dependency will
|
|
* be resolved when the inode is updated with MNT_WAIT.
|
|
* This work is done in two passes. The first pass grabs most
|
|
* of the buffers and begins asynchronously writing them. The
|
|
* only way to wait for these asynchronous writes is to sleep
|
|
* on the filesystem vnode which may stay busy for a long time
|
|
* if the filesystem is active. So, instead, we make a second
|
|
* pass over the dependencies blocking on each write. In the
|
|
* usual case we will be blocking against a write that we
|
|
* initiated, so when it is done the dependency will have been
|
|
* resolved. Thus the second pass is expected to end quickly.
|
|
*/
|
|
waitfor = MNT_NOWAIT;
|
|
top:
|
|
if (getdirtybuf(&TAILQ_FIRST(&vp->v_dirtyblkhd), MNT_WAIT) == 0) {
|
|
FREE_LOCK(&lk);
|
|
return (0);
|
|
}
|
|
bp = TAILQ_FIRST(&vp->v_dirtyblkhd);
|
|
loop:
|
|
/*
|
|
* As we hold the buffer locked, none of its dependencies
|
|
* will disappear.
|
|
*/
|
|
for (wk = LIST_FIRST(&bp->b_dep); wk;
|
|
wk = LIST_NEXT(wk, wk_list)) {
|
|
switch (wk->wk_type) {
|
|
|
|
case D_ALLOCDIRECT:
|
|
adp = WK_ALLOCDIRECT(wk);
|
|
if (adp->ad_state & DEPCOMPLETE)
|
|
break;
|
|
nbp = adp->ad_buf;
|
|
if (getdirtybuf(&nbp, waitfor) == 0)
|
|
break;
|
|
FREE_LOCK(&lk);
|
|
if (waitfor == MNT_NOWAIT) {
|
|
bawrite(nbp);
|
|
} else if ((error = VOP_BWRITE(nbp->b_vp, nbp)) != 0) {
|
|
bawrite(bp);
|
|
return (error);
|
|
}
|
|
ACQUIRE_LOCK(&lk);
|
|
break;
|
|
|
|
case D_ALLOCINDIR:
|
|
aip = WK_ALLOCINDIR(wk);
|
|
if (aip->ai_state & DEPCOMPLETE)
|
|
break;
|
|
nbp = aip->ai_buf;
|
|
if (getdirtybuf(&nbp, waitfor) == 0)
|
|
break;
|
|
FREE_LOCK(&lk);
|
|
if (waitfor == MNT_NOWAIT) {
|
|
bawrite(nbp);
|
|
} else if ((error = VOP_BWRITE(nbp->b_vp, nbp)) != 0) {
|
|
bawrite(bp);
|
|
return (error);
|
|
}
|
|
ACQUIRE_LOCK(&lk);
|
|
break;
|
|
|
|
case D_INDIRDEP:
|
|
restart:
|
|
for (aip = LIST_FIRST(&WK_INDIRDEP(wk)->ir_deplisthd);
|
|
aip; aip = LIST_NEXT(aip, ai_next)) {
|
|
if (aip->ai_state & DEPCOMPLETE)
|
|
continue;
|
|
nbp = aip->ai_buf;
|
|
if (getdirtybuf(&nbp, MNT_WAIT) == 0)
|
|
goto restart;
|
|
FREE_LOCK(&lk);
|
|
if ((error = VOP_BWRITE(nbp->b_vp, nbp)) != 0) {
|
|
bawrite(bp);
|
|
return (error);
|
|
}
|
|
ACQUIRE_LOCK(&lk);
|
|
goto restart;
|
|
}
|
|
break;
|
|
|
|
case D_INODEDEP:
|
|
if ((error = flush_inodedep_deps(WK_INODEDEP(wk)->id_fs,
|
|
WK_INODEDEP(wk)->id_ino)) != 0) {
|
|
FREE_LOCK(&lk);
|
|
bawrite(bp);
|
|
return (error);
|
|
}
|
|
break;
|
|
|
|
case D_PAGEDEP:
|
|
/*
|
|
* We are trying to sync a directory that may
|
|
* have dependencies on both its own metadata
|
|
* and/or dependencies on the inodes of any
|
|
* recently allocated files. We walk its diradd
|
|
* lists pushing out the associated inode.
|
|
*/
|
|
pagedep = WK_PAGEDEP(wk);
|
|
for (i = 0; i < DAHASHSZ; i++) {
|
|
if (LIST_FIRST(&pagedep->pd_diraddhd[i]) == 0)
|
|
continue;
|
|
if ((error =
|
|
flush_pagedep_deps(vp, pagedep->pd_mnt,
|
|
&pagedep->pd_diraddhd[i]))) {
|
|
FREE_LOCK(&lk);
|
|
bawrite(bp);
|
|
return (error);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case D_MKDIR:
|
|
/*
|
|
* This case should never happen if the vnode has
|
|
* been properly sync'ed. However, if this function
|
|
* is used at a place where the vnode has not yet
|
|
* been sync'ed, this dependency can show up. So,
|
|
* rather than panic, just flush it.
|
|
*/
|
|
nbp = WK_MKDIR(wk)->md_buf;
|
|
if (getdirtybuf(&nbp, waitfor) == 0)
|
|
break;
|
|
FREE_LOCK(&lk);
|
|
if (waitfor == MNT_NOWAIT) {
|
|
bawrite(nbp);
|
|
} else if ((error = VOP_BWRITE(nbp->b_vp, nbp)) != 0) {
|
|
bawrite(bp);
|
|
return (error);
|
|
}
|
|
ACQUIRE_LOCK(&lk);
|
|
break;
|
|
|
|
case D_BMSAFEMAP:
|
|
/*
|
|
* This case should never happen if the vnode has
|
|
* been properly sync'ed. However, if this function
|
|
* is used at a place where the vnode has not yet
|
|
* been sync'ed, this dependency can show up. So,
|
|
* rather than panic, just flush it.
|
|
*/
|
|
nbp = WK_BMSAFEMAP(wk)->sm_buf;
|
|
if (getdirtybuf(&nbp, waitfor) == 0)
|
|
break;
|
|
FREE_LOCK(&lk);
|
|
if (waitfor == MNT_NOWAIT) {
|
|
bawrite(nbp);
|
|
} else if ((error = VOP_BWRITE(nbp->b_vp, nbp)) != 0) {
|
|
bawrite(bp);
|
|
return (error);
|
|
}
|
|
ACQUIRE_LOCK(&lk);
|
|
break;
|
|
|
|
default:
|
|
panic("softdep_sync_metadata: Unknown type %s",
|
|
TYPENAME(wk->wk_type));
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
(void) getdirtybuf(&TAILQ_NEXT(bp, b_vnbufs), MNT_WAIT);
|
|
nbp = TAILQ_NEXT(bp, b_vnbufs);
|
|
FREE_LOCK(&lk);
|
|
bawrite(bp);
|
|
ACQUIRE_LOCK(&lk);
|
|
if (nbp != NULL) {
|
|
bp = nbp;
|
|
goto loop;
|
|
}
|
|
/*
|
|
* We must wait for any I/O in progress to finish so that
|
|
* all potential buffers on the dirty list will be visible.
|
|
* Once they are all there, proceed with the second pass
|
|
* which will wait for the I/O as per above.
|
|
*/
|
|
drain_output(vp, 1);
|
|
/*
|
|
* The brief unlock is to allow any pent up dependency
|
|
* processing to be done.
|
|
*/
|
|
if (waitfor == MNT_NOWAIT) {
|
|
waitfor = MNT_WAIT;
|
|
FREE_LOCK(&lk);
|
|
ACQUIRE_LOCK(&lk);
|
|
goto top;
|
|
}
|
|
|
|
/*
|
|
* If we have managed to get rid of all the dirty buffers,
|
|
* then we are done. For certain directories and block
|
|
* devices, we may need to do further work.
|
|
*/
|
|
if (TAILQ_FIRST(&vp->v_dirtyblkhd) == NULL) {
|
|
FREE_LOCK(&lk);
|
|
return (0);
|
|
}
|
|
|
|
FREE_LOCK(&lk);
|
|
/*
|
|
* If we are trying to sync a block device, some of its buffers may
|
|
* contain metadata that cannot be written until the contents of some
|
|
* partially written files have been written to disk. The only easy
|
|
* way to accomplish this is to sync the entire filesystem (luckily
|
|
* this happens rarely).
|
|
*/
|
|
if (vn_isdisk(vp, NULL) &&
|
|
vp->v_specmountpoint && !VOP_ISLOCKED(vp, NULL) &&
|
|
(error = VFS_SYNC(vp->v_specmountpoint, MNT_WAIT, ap->a_cred,
|
|
ap->a_p)) != 0)
|
|
return (error);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Flush the dependencies associated with an inodedep.
|
|
* Called with splbio blocked.
|
|
*/
|
|
static int
|
|
flush_inodedep_deps(fs, ino)
|
|
struct fs *fs;
|
|
ino_t ino;
|
|
{
|
|
struct inodedep *inodedep;
|
|
struct allocdirect *adp;
|
|
int error, waitfor;
|
|
struct buf *bp;
|
|
|
|
/*
|
|
* This work is done in two passes. The first pass grabs most
|
|
* of the buffers and begins asynchronously writing them. The
|
|
* only way to wait for these asynchronous writes is to sleep
|
|
* on the filesystem vnode which may stay busy for a long time
|
|
* if the filesystem is active. So, instead, we make a second
|
|
* pass over the dependencies blocking on each write. In the
|
|
* usual case we will be blocking against a write that we
|
|
* initiated, so when it is done the dependency will have been
|
|
* resolved. Thus the second pass is expected to end quickly.
|
|
* We give a brief window at the top of the loop to allow
|
|
* any pending I/O to complete.
|
|
*/
|
|
for (waitfor = MNT_NOWAIT; ; ) {
|
|
FREE_LOCK(&lk);
|
|
ACQUIRE_LOCK(&lk);
|
|
if (inodedep_lookup(fs, ino, 0, &inodedep) == 0)
|
|
return (0);
|
|
for (adp = TAILQ_FIRST(&inodedep->id_inoupdt); adp;
|
|
adp = TAILQ_NEXT(adp, ad_next)) {
|
|
if (adp->ad_state & DEPCOMPLETE)
|
|
continue;
|
|
bp = adp->ad_buf;
|
|
if (getdirtybuf(&bp, waitfor) == 0) {
|
|
if (waitfor == MNT_NOWAIT)
|
|
continue;
|
|
break;
|
|
}
|
|
FREE_LOCK(&lk);
|
|
if (waitfor == MNT_NOWAIT) {
|
|
bawrite(bp);
|
|
} else if ((error = VOP_BWRITE(bp->b_vp, bp)) != 0) {
|
|
ACQUIRE_LOCK(&lk);
|
|
return (error);
|
|
}
|
|
ACQUIRE_LOCK(&lk);
|
|
break;
|
|
}
|
|
if (adp != NULL)
|
|
continue;
|
|
for (adp = TAILQ_FIRST(&inodedep->id_newinoupdt); adp;
|
|
adp = TAILQ_NEXT(adp, ad_next)) {
|
|
if (adp->ad_state & DEPCOMPLETE)
|
|
continue;
|
|
bp = adp->ad_buf;
|
|
if (getdirtybuf(&bp, waitfor) == 0) {
|
|
if (waitfor == MNT_NOWAIT)
|
|
continue;
|
|
break;
|
|
}
|
|
FREE_LOCK(&lk);
|
|
if (waitfor == MNT_NOWAIT) {
|
|
bawrite(bp);
|
|
} else if ((error = VOP_BWRITE(bp->b_vp, bp)) != 0) {
|
|
ACQUIRE_LOCK(&lk);
|
|
return (error);
|
|
}
|
|
ACQUIRE_LOCK(&lk);
|
|
break;
|
|
}
|
|
if (adp != NULL)
|
|
continue;
|
|
/*
|
|
* If pass2, we are done, otherwise do pass 2.
|
|
*/
|
|
if (waitfor == MNT_WAIT)
|
|
break;
|
|
waitfor = MNT_WAIT;
|
|
}
|
|
/*
|
|
* Try freeing inodedep in case all dependencies have been removed.
|
|
*/
|
|
if (inodedep_lookup(fs, ino, 0, &inodedep) != 0)
|
|
(void) free_inodedep(inodedep);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Eliminate a pagedep dependency by flushing out all its diradd dependencies.
|
|
* Called with splbio blocked.
|
|
*/
|
|
static int
|
|
flush_pagedep_deps(pvp, mp, diraddhdp)
|
|
struct vnode *pvp;
|
|
struct mount *mp;
|
|
struct diraddhd *diraddhdp;
|
|
{
|
|
struct proc *p = CURPROC; /* XXX */
|
|
struct inodedep *inodedep;
|
|
struct ufsmount *ump;
|
|
struct diradd *dap;
|
|
struct vnode *vp;
|
|
int gotit, error = 0;
|
|
struct buf *bp;
|
|
ino_t inum;
|
|
|
|
ump = VFSTOUFS(mp);
|
|
while ((dap = LIST_FIRST(diraddhdp)) != NULL) {
|
|
/*
|
|
* Flush ourselves if this directory entry
|
|
* has a MKDIR_PARENT dependency.
|
|
*/
|
|
if (dap->da_state & MKDIR_PARENT) {
|
|
FREE_LOCK(&lk);
|
|
if ((error = UFS_UPDATE(pvp, 1)) != 0)
|
|
break;
|
|
ACQUIRE_LOCK(&lk);
|
|
/*
|
|
* If that cleared dependencies, go on to next.
|
|
*/
|
|
if (dap != LIST_FIRST(diraddhdp))
|
|
continue;
|
|
if (dap->da_state & MKDIR_PARENT)
|
|
panic("flush_pagedep_deps: MKDIR_PARENT");
|
|
}
|
|
/*
|
|
* A newly allocated directory must have its "." and
|
|
* ".." entries written out before its name can be
|
|
* committed in its parent. We do not want or need
|
|
* the full semantics of a synchronous VOP_FSYNC as
|
|
* that may end up here again, once for each directory
|
|
* level in the filesystem. Instead, we push the blocks
|
|
* and wait for them to clear. We have to fsync twice
|
|
* because the first call may choose to defer blocks
|
|
* that still have dependencies, but deferral will
|
|
* happen at most once.
|
|
*/
|
|
inum = dap->da_newinum;
|
|
if (dap->da_state & MKDIR_BODY) {
|
|
FREE_LOCK(&lk);
|
|
if ((error = VFS_VGET(mp, inum, &vp)) != 0)
|
|
break;
|
|
if ((error=VOP_FSYNC(vp, p->p_ucred, MNT_NOWAIT, p)) ||
|
|
(error=VOP_FSYNC(vp, p->p_ucred, MNT_NOWAIT, p))) {
|
|
vput(vp);
|
|
break;
|
|
}
|
|
drain_output(vp, 0);
|
|
vput(vp);
|
|
ACQUIRE_LOCK(&lk);
|
|
/*
|
|
* If that cleared dependencies, go on to next.
|
|
*/
|
|
if (dap != LIST_FIRST(diraddhdp))
|
|
continue;
|
|
if (dap->da_state & MKDIR_BODY)
|
|
panic("flush_pagedep_deps: MKDIR_BODY");
|
|
}
|
|
/*
|
|
* Flush the inode on which the directory entry depends.
|
|
* Having accounted for MKDIR_PARENT and MKDIR_BODY above,
|
|
* the only remaining dependency is that the updated inode
|
|
* count must get pushed to disk. The inode has already
|
|
* been pushed into its inode buffer (via VOP_UPDATE) at
|
|
* the time of the reference count change. So we need only
|
|
* locate that buffer, ensure that there will be no rollback
|
|
* caused by a bitmap dependency, then write the inode buffer.
|
|
*/
|
|
if (inodedep_lookup(ump->um_fs, inum, 0, &inodedep) == 0)
|
|
panic("flush_pagedep_deps: lost inode");
|
|
/*
|
|
* If the inode still has bitmap dependencies,
|
|
* push them to disk.
|
|
*/
|
|
if ((inodedep->id_state & DEPCOMPLETE) == 0) {
|
|
gotit = getdirtybuf(&inodedep->id_buf, MNT_WAIT);
|
|
FREE_LOCK(&lk);
|
|
if (gotit &&
|
|
(error = VOP_BWRITE(inodedep->id_buf->b_vp,
|
|
inodedep->id_buf)) != 0)
|
|
break;
|
|
ACQUIRE_LOCK(&lk);
|
|
if (dap != LIST_FIRST(diraddhdp))
|
|
continue;
|
|
}
|
|
/*
|
|
* If the inode is still sitting in a buffer waiting
|
|
* to be written, push it to disk.
|
|
*/
|
|
FREE_LOCK(&lk);
|
|
if ((error = bread(ump->um_devvp,
|
|
fsbtodb(ump->um_fs, ino_to_fsba(ump->um_fs, inum)),
|
|
(int)ump->um_fs->fs_bsize, NOCRED, &bp)) != 0)
|
|
break;
|
|
if ((error = VOP_BWRITE(bp->b_vp, bp)) != 0)
|
|
break;
|
|
ACQUIRE_LOCK(&lk);
|
|
/*
|
|
* If we have failed to get rid of all the dependencies
|
|
* then something is seriously wrong.
|
|
*/
|
|
if (dap == LIST_FIRST(diraddhdp))
|
|
panic("flush_pagedep_deps: flush failed");
|
|
}
|
|
if (error)
|
|
ACQUIRE_LOCK(&lk);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* A large burst of file addition or deletion activity can drive the
|
|
* memory load excessively high. Therefore we deliberately slow things
|
|
* down and speed up the I/O processing if we find ourselves with too
|
|
* many dependencies in progress.
|
|
*/
|
|
static int
|
|
request_cleanup(resource, islocked)
|
|
int resource;
|
|
int islocked;
|
|
{
|
|
struct callout_handle handle;
|
|
struct proc *p = CURPROC;
|
|
|
|
/*
|
|
* We never hold up the filesystem syncer process.
|
|
*/
|
|
if (p == filesys_syncer)
|
|
return (0);
|
|
/*
|
|
* If we are resource constrained on inode dependencies, try
|
|
* flushing some dirty inodes. Otherwise, we are constrained
|
|
* by file deletions, so try accelerating flushes of directories
|
|
* with removal dependencies. We would like to do the cleanup
|
|
* here, but we probably hold an inode locked at this point and
|
|
* that might deadlock against one that we try to clean. So,
|
|
* the best that we can do is request the syncer daemon to do
|
|
* the cleanup for us.
|
|
*/
|
|
switch (resource) {
|
|
|
|
case FLUSH_INODES:
|
|
stat_ino_limit_push += 1;
|
|
req_clear_inodedeps = 1;
|
|
break;
|
|
|
|
case FLUSH_REMOVE:
|
|
stat_blk_limit_push += 1;
|
|
req_clear_remove = 1;
|
|
break;
|
|
|
|
default:
|
|
panic("request_cleanup: unknown type");
|
|
}
|
|
/*
|
|
* Hopefully the syncer daemon will catch up and awaken us.
|
|
* We wait at most tickdelay before proceeding in any case.
|
|
*/
|
|
if (islocked == 0)
|
|
ACQUIRE_LOCK(&lk);
|
|
if (proc_waiting == 0) {
|
|
proc_waiting = 1;
|
|
handle = timeout(pause_timer, NULL,
|
|
tickdelay > 2 ? tickdelay : 2);
|
|
}
|
|
FREE_LOCK_INTERLOCKED(&lk);
|
|
(void) tsleep((caddr_t)&proc_waiting, PPAUSE, "softupdate", 0);
|
|
ACQUIRE_LOCK_INTERLOCKED(&lk);
|
|
if (proc_waiting) {
|
|
untimeout(pause_timer, NULL, handle);
|
|
proc_waiting = 0;
|
|
} else {
|
|
switch (resource) {
|
|
|
|
case FLUSH_INODES:
|
|
stat_ino_limit_hit += 1;
|
|
break;
|
|
|
|
case FLUSH_REMOVE:
|
|
stat_blk_limit_hit += 1;
|
|
break;
|
|
}
|
|
}
|
|
if (islocked == 0)
|
|
FREE_LOCK(&lk);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Awaken processes pausing in request_cleanup and clear proc_waiting
|
|
* to indicate that there is no longer a timer running.
|
|
*/
|
|
void
|
|
pause_timer(arg)
|
|
void *arg;
|
|
{
|
|
|
|
proc_waiting = 0;
|
|
wakeup(&proc_waiting);
|
|
}
|
|
|
|
/*
|
|
* Flush out a directory with at least one removal dependency in an effort to
|
|
* reduce the number of dirrem, freefile, and freeblks dependency structures.
|
|
*/
|
|
static void
|
|
clear_remove(p)
|
|
struct proc *p;
|
|
{
|
|
struct pagedep_hashhead *pagedephd;
|
|
struct pagedep *pagedep;
|
|
static int next = 0;
|
|
struct mount *mp;
|
|
struct vnode *vp;
|
|
int error, cnt;
|
|
ino_t ino;
|
|
|
|
ACQUIRE_LOCK(&lk);
|
|
for (cnt = 0; cnt < pagedep_hash; cnt++) {
|
|
pagedephd = &pagedep_hashtbl[next++];
|
|
if (next >= pagedep_hash)
|
|
next = 0;
|
|
for (pagedep = LIST_FIRST(pagedephd); pagedep;
|
|
pagedep = LIST_NEXT(pagedep, pd_hash)) {
|
|
if (LIST_FIRST(&pagedep->pd_dirremhd) == NULL)
|
|
continue;
|
|
mp = pagedep->pd_mnt;
|
|
ino = pagedep->pd_ino;
|
|
FREE_LOCK(&lk);
|
|
if ((error = VFS_VGET(mp, ino, &vp)) != 0) {
|
|
softdep_error("clear_remove: vget", error);
|
|
return;
|
|
}
|
|
if ((error = VOP_FSYNC(vp, p->p_ucred, MNT_NOWAIT, p)))
|
|
softdep_error("clear_remove: fsync", error);
|
|
drain_output(vp, 0);
|
|
vput(vp);
|
|
return;
|
|
}
|
|
}
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* Clear out a block of dirty inodes in an effort to reduce
|
|
* the number of inodedep dependency structures.
|
|
*/
|
|
static void
|
|
clear_inodedeps(p)
|
|
struct proc *p;
|
|
{
|
|
struct inodedep_hashhead *inodedephd;
|
|
struct inodedep *inodedep;
|
|
static int next = 0;
|
|
struct mount *mp;
|
|
struct vnode *vp;
|
|
struct fs *fs;
|
|
int error, cnt;
|
|
ino_t firstino, lastino, ino;
|
|
|
|
ACQUIRE_LOCK(&lk);
|
|
/*
|
|
* Pick a random inode dependency to be cleared.
|
|
* We will then gather up all the inodes in its block
|
|
* that have dependencies and flush them out.
|
|
*/
|
|
for (cnt = 0; cnt < inodedep_hash; cnt++) {
|
|
inodedephd = &inodedep_hashtbl[next++];
|
|
if (next >= inodedep_hash)
|
|
next = 0;
|
|
if ((inodedep = LIST_FIRST(inodedephd)) != NULL)
|
|
break;
|
|
}
|
|
/*
|
|
* Ugly code to find mount point given pointer to superblock.
|
|
*/
|
|
fs = inodedep->id_fs;
|
|
TAILQ_FOREACH(mp, &mountlist, mnt_list)
|
|
if ((mp->mnt_flag & MNT_SOFTDEP) && fs == VFSTOUFS(mp)->um_fs)
|
|
break;
|
|
/*
|
|
* Find the last inode in the block with dependencies.
|
|
*/
|
|
firstino = inodedep->id_ino & ~(INOPB(fs) - 1);
|
|
for (lastino = firstino + INOPB(fs) - 1; lastino > firstino; lastino--)
|
|
if (inodedep_lookup(fs, lastino, 0, &inodedep) != 0)
|
|
break;
|
|
/*
|
|
* Asynchronously push all but the last inode with dependencies.
|
|
* Synchronously push the last inode with dependencies to ensure
|
|
* that the inode block gets written to free up the inodedeps.
|
|
*/
|
|
for (ino = firstino; ino <= lastino; ino++) {
|
|
if (inodedep_lookup(fs, ino, 0, &inodedep) == 0)
|
|
continue;
|
|
FREE_LOCK(&lk);
|
|
if ((error = VFS_VGET(mp, ino, &vp)) != 0) {
|
|
softdep_error("clear_inodedeps: vget", error);
|
|
return;
|
|
}
|
|
if (ino == lastino) {
|
|
if ((error = VOP_FSYNC(vp, p->p_ucred, MNT_WAIT, p)))
|
|
softdep_error("clear_inodedeps: fsync1", error);
|
|
} else {
|
|
if ((error = VOP_FSYNC(vp, p->p_ucred, MNT_NOWAIT, p)))
|
|
softdep_error("clear_inodedeps: fsync2", error);
|
|
drain_output(vp, 0);
|
|
}
|
|
vput(vp);
|
|
ACQUIRE_LOCK(&lk);
|
|
}
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* Function to determine if the buffer has outstanding dependencies
|
|
* that will cause a roll-back if the buffer is written. If wantcount
|
|
* is set, return number of dependencies, otherwise just yes or no.
|
|
*/
|
|
static int
|
|
softdep_count_dependencies(bp, wantcount)
|
|
struct buf *bp;
|
|
int wantcount;
|
|
{
|
|
struct worklist *wk;
|
|
struct inodedep *inodedep;
|
|
struct indirdep *indirdep;
|
|
struct allocindir *aip;
|
|
struct pagedep *pagedep;
|
|
struct diradd *dap;
|
|
int i, retval;
|
|
|
|
retval = 0;
|
|
ACQUIRE_LOCK(&lk);
|
|
for (wk = LIST_FIRST(&bp->b_dep); wk; wk = LIST_NEXT(wk, wk_list)) {
|
|
switch (wk->wk_type) {
|
|
|
|
case D_INODEDEP:
|
|
inodedep = WK_INODEDEP(wk);
|
|
if ((inodedep->id_state & DEPCOMPLETE) == 0) {
|
|
/* bitmap allocation dependency */
|
|
retval += 1;
|
|
if (!wantcount)
|
|
goto out;
|
|
}
|
|
if (TAILQ_FIRST(&inodedep->id_inoupdt)) {
|
|
/* direct block pointer dependency */
|
|
retval += 1;
|
|
if (!wantcount)
|
|
goto out;
|
|
}
|
|
continue;
|
|
|
|
case D_INDIRDEP:
|
|
indirdep = WK_INDIRDEP(wk);
|
|
for (aip = LIST_FIRST(&indirdep->ir_deplisthd);
|
|
aip; aip = LIST_NEXT(aip, ai_next)) {
|
|
/* indirect block pointer dependency */
|
|
retval += 1;
|
|
if (!wantcount)
|
|
goto out;
|
|
}
|
|
continue;
|
|
|
|
case D_PAGEDEP:
|
|
pagedep = WK_PAGEDEP(wk);
|
|
for (i = 0; i < DAHASHSZ; i++) {
|
|
for (dap = LIST_FIRST(&pagedep->pd_diraddhd[i]);
|
|
dap; dap = LIST_NEXT(dap, da_pdlist)) {
|
|
/* directory entry dependency */
|
|
retval += 1;
|
|
if (!wantcount)
|
|
goto out;
|
|
}
|
|
}
|
|
continue;
|
|
|
|
case D_BMSAFEMAP:
|
|
case D_ALLOCDIRECT:
|
|
case D_ALLOCINDIR:
|
|
case D_MKDIR:
|
|
/* never a dependency on these blocks */
|
|
continue;
|
|
|
|
default:
|
|
panic("softdep_check_for_rollback: Unexpected type %s",
|
|
TYPENAME(wk->wk_type));
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
out:
|
|
FREE_LOCK(&lk);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Acquire exclusive access to a buffer.
|
|
* Must be called with splbio blocked.
|
|
* Return 1 if buffer was acquired.
|
|
*/
|
|
static int
|
|
getdirtybuf(bpp, waitfor)
|
|
struct buf **bpp;
|
|
int waitfor;
|
|
{
|
|
struct buf *bp;
|
|
|
|
for (;;) {
|
|
if ((bp = *bpp) == NULL)
|
|
return (0);
|
|
if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT) == 0) {
|
|
if ((bp->b_xflags & BX_BKGRDINPROG) == 0)
|
|
break;
|
|
BUF_UNLOCK(bp);
|
|
if (waitfor != MNT_WAIT)
|
|
return (0);
|
|
bp->b_xflags |= BX_BKGRDWAIT;
|
|
FREE_LOCK_INTERLOCKED(&lk);
|
|
tsleep(&bp->b_xflags, PRIBIO, "getbuf", 0);
|
|
ACQUIRE_LOCK_INTERLOCKED(&lk);
|
|
continue;
|
|
}
|
|
if (waitfor != MNT_WAIT)
|
|
return (0);
|
|
FREE_LOCK_INTERLOCKED(&lk);
|
|
if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL) != ENOLCK)
|
|
panic("getdirtybuf: inconsistent lock");
|
|
ACQUIRE_LOCK_INTERLOCKED(&lk);
|
|
}
|
|
if ((bp->b_flags & B_DELWRI) == 0) {
|
|
BUF_UNLOCK(bp);
|
|
return (0);
|
|
}
|
|
bremfree(bp);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Wait for pending output on a vnode to complete.
|
|
* Must be called with vnode locked.
|
|
*/
|
|
static void
|
|
drain_output(vp, islocked)
|
|
struct vnode *vp;
|
|
int islocked;
|
|
{
|
|
|
|
if (!islocked)
|
|
ACQUIRE_LOCK(&lk);
|
|
while (vp->v_numoutput) {
|
|
vp->v_flag |= VBWAIT;
|
|
FREE_LOCK_INTERLOCKED(&lk);
|
|
tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "drainvp", 0);
|
|
ACQUIRE_LOCK_INTERLOCKED(&lk);
|
|
}
|
|
if (!islocked)
|
|
FREE_LOCK(&lk);
|
|
}
|
|
|
|
/*
|
|
* Called whenever a buffer that is being invalidated or reallocated
|
|
* contains dependencies. This should only happen if an I/O error has
|
|
* occurred. The routine is called with the buffer locked.
|
|
*/
|
|
static void
|
|
softdep_deallocate_dependencies(bp)
|
|
struct buf *bp;
|
|
{
|
|
|
|
if ((bp->b_flags & B_ERROR) == 0)
|
|
panic("softdep_deallocate_dependencies: dangling deps");
|
|
softdep_error(bp->b_vp->v_mount->mnt_stat.f_mntonname, bp->b_error);
|
|
panic("softdep_deallocate_dependencies: unrecovered I/O error");
|
|
}
|
|
|
|
/*
|
|
* Function to handle asynchronous write errors in the filesystem.
|
|
*/
|
|
void
|
|
softdep_error(func, error)
|
|
char *func;
|
|
int error;
|
|
{
|
|
|
|
/* XXX should do something better! */
|
|
printf("%s: got error %d while accessing filesystem\n", func, error);
|
|
}
|