3c81694426
form `tv = time'. Use a new function gettime(). The current version just forces atomicicity without fixing precision or efficiency bugs. Simplified some related valid accesses by using the central function.
579 lines
16 KiB
C
579 lines
16 KiB
C
/*
|
|
* modified for Lites 1.1
|
|
*
|
|
* Aug 1995, Godmar Back (gback@cs.utah.edu)
|
|
* University of Utah, Department of Computer Science
|
|
*/
|
|
/*
|
|
* Copyright (c) 1982, 1986, 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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.
|
|
*
|
|
* @(#)ext2_alloc.c 8.8 (Berkeley) 2/21/94
|
|
*/
|
|
|
|
#if !defined(__FreeBSD__)
|
|
#include "quota.h"
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|
#include "diagnostic.h"
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|
#else
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|
#include "opt_quota.h"
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|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/mount.h>
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|
#include <sys/kernel.h>
|
|
#include <sys/syslog.h>
|
|
|
|
#include <vm/vm.h>
|
|
|
|
#include <ufs/ufs/quota.h>
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|
#include <ufs/ufs/inode.h>
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|
|
|
#include <gnu/ext2fs/ext2_fs.h>
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|
#include <gnu/ext2fs/ext2_fs_sb.h>
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|
#include <gnu/ext2fs/fs.h>
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|
#include <gnu/ext2fs/ext2_extern.h>
|
|
|
|
extern u_long nextgennumber;
|
|
|
|
static void ext2_fserr __P((struct ext2_sb_info *, u_int, char *));
|
|
|
|
/*
|
|
* Linux calls this functions at the following locations:
|
|
* (1) the inode is freed
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|
* (2) a preallocation miss occurs
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|
* (3) truncate is called
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|
* (4) release_file is called and f_mode & 2
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|
*
|
|
* I call it in ext2_inactive, ext2_truncate, ext2_vfree and in (2)
|
|
* the call in vfree might be redundant
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|
*/
|
|
void ext2_discard_prealloc (struct inode * ip)
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|
{
|
|
#ifdef EXT2_PREALLOCATE
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|
if (ip->i_prealloc_count) {
|
|
int i = ip->i_prealloc_count;
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|
ip->i_prealloc_count = 0;
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|
ext2_free_blocks (ITOV(ip)->v_mount,
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|
ip->i_prealloc_block,
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|
i);
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|
}
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|
#endif
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|
}
|
|
|
|
/*
|
|
* Allocate a block in the file system.
|
|
*
|
|
* this takes the framework from ffs_alloc. To implement the
|
|
* actual allocation, it calls ext2_new_block, the ported version
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|
* of the same Linux routine.
|
|
*
|
|
* we note that this is always called in connection with ext2_blkpref
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|
*
|
|
* preallocation is done as Linux does it
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|
*/
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|
int
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|
ext2_alloc(ip, lbn, bpref, size, cred, bnp)
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|
register struct inode *ip;
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|
daddr_t lbn, bpref;
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|
int size;
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|
struct ucred *cred;
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|
daddr_t *bnp;
|
|
{
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|
register struct ext2_sb_info *fs;
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|
daddr_t bno;
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|
#if QUOTA
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|
int error;
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|
#endif
|
|
|
|
*bnp = 0;
|
|
fs = ip->i_e2fs;
|
|
#if DIAGNOSTIC
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|
if ((u_int)size > fs->s_blocksize || blkoff(fs, size) != 0) {
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|
printf("dev = 0x%x, bsize = %d, size = %d, fs = %s\n",
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ip->i_dev, fs->s_blocksize, size, fs->fs_fsmnt);
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|
panic("ext2_alloc: bad size");
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|
}
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|
if (cred == NOCRED)
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|
panic("ext2_alloc: missing credential\n");
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|
#endif /* DIAGNOSTIC */
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|
if (size == fs->s_blocksize && fs->s_es->s_free_blocks_count == 0)
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|
goto nospace;
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|
if (cred->cr_uid != 0 &&
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|
fs->s_es->s_free_blocks_count < fs->s_es->s_r_blocks_count)
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|
goto nospace;
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|
#if QUOTA
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|
if (error = chkdq(ip, (long)btodb(size), cred, 0))
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|
return (error);
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|
#endif
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|
if (bpref >= fs->s_es->s_blocks_count)
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|
bpref = 0;
|
|
/* call the Linux code */
|
|
#ifdef EXT2_PREALLOCATE
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|
/* To have a preallocation hit, we must
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|
* - have at least one block preallocated
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|
* - and our preferred block must have that block number or one below
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|
*/
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|
if (ip->i_prealloc_count &&
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|
(bpref == ip->i_prealloc_block ||
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|
bpref + 1 == ip->i_prealloc_block))
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|
{
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|
bno = ip->i_prealloc_block++;
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ip->i_prealloc_count--;
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|
/* ext2_debug ("preallocation hit (%lu/%lu).\n",
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|
++alloc_hits, ++alloc_attempts); */
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|
|
|
/* Linux gets, clears, and releases the buffer at this
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|
point - we don't have to that; we leave it to the caller
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|
*/
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|
} else {
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|
ext2_discard_prealloc (ip);
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|
/* ext2_debug ("preallocation miss (%lu/%lu).\n",
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|
alloc_hits, ++alloc_attempts); */
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|
if (S_ISREG(ip->i_mode))
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|
bno = ext2_new_block
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|
(ITOV(ip)->v_mount, bpref,
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|
&ip->i_prealloc_count,
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|
&ip->i_prealloc_block);
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|
else
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|
bno = (daddr_t)ext2_new_block(ITOV(ip)->v_mount,
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|
bpref, 0, 0);
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|
}
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|
#else
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|
bno = (daddr_t)ext2_new_block(ITOV(ip)->v_mount, bpref, 0, 0);
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|
#endif
|
|
|
|
if (bno > 0) {
|
|
/* set next_alloc fields as done in block_getblk */
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|
ip->i_next_alloc_block = lbn;
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|
ip->i_next_alloc_goal = bno;
|
|
|
|
ip->i_blocks += btodb(size);
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
*bnp = bno;
|
|
return (0);
|
|
}
|
|
#if QUOTA
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|
/*
|
|
* Restore user's disk quota because allocation failed.
|
|
*/
|
|
(void) chkdq(ip, (long)-btodb(size), cred, FORCE);
|
|
#endif
|
|
nospace:
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|
ext2_fserr(fs, cred->cr_uid, "file system full");
|
|
uprintf("\n%s: write failed, file system is full\n", fs->fs_fsmnt);
|
|
return (ENOSPC);
|
|
}
|
|
|
|
/*
|
|
* Reallocate a sequence of blocks into a contiguous sequence of blocks.
|
|
*
|
|
* The vnode and an array of buffer pointers for a range of sequential
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|
* logical blocks to be made contiguous is given. The allocator attempts
|
|
* to find a range of sequential blocks starting as close as possible to
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|
* an fs_rotdelay offset from the end of the allocation for the logical
|
|
* block immediately preceeding the current range. If successful, the
|
|
* physical block numbers in the buffer pointers and in the inode are
|
|
* changed to reflect the new allocation. If unsuccessful, the allocation
|
|
* is left unchanged. The success in doing the reallocation is returned.
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|
* Note that the error return is not reflected back to the user. Rather
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|
* the previous block allocation will be used.
|
|
*/
|
|
|
|
#ifdef FANCY_REALLOC
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|
#include <sys/sysctl.h>
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|
static int doasyncfree = 1;
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|
#ifdef OPT_DEBUG
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|
SYSCTL_INT(_debug, 14, doasyncfree, CTLFLAG_RW, &doasyncfree, 0, "");
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|
#endif /* OPT_DEBUG */
|
|
#endif
|
|
|
|
int
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|
ext2_reallocblks(ap)
|
|
struct vop_reallocblks_args /* {
|
|
struct vnode *a_vp;
|
|
struct cluster_save *a_buflist;
|
|
} */ *ap;
|
|
{
|
|
#ifndef FANCY_REALLOC
|
|
/* printf("ext2_reallocblks not implemented\n"); */
|
|
return ENOSPC;
|
|
#else
|
|
|
|
struct ext2_sb_info *fs;
|
|
struct inode *ip;
|
|
struct vnode *vp;
|
|
struct buf *sbp, *ebp;
|
|
daddr_t *bap, *sbap, *ebap;
|
|
struct cluster_save *buflist;
|
|
daddr_t start_lbn, end_lbn, soff, eoff, newblk, blkno;
|
|
struct indir start_ap[NIADDR + 1], end_ap[NIADDR + 1], *idp;
|
|
int i, len, start_lvl, end_lvl, pref, ssize;
|
|
struct timeval tv;
|
|
|
|
vp = ap->a_vp;
|
|
ip = VTOI(vp);
|
|
fs = ip->i_e2fs;
|
|
#ifdef UNKLAR
|
|
if (fs->fs_contigsumsize <= 0)
|
|
return (ENOSPC);
|
|
#endif
|
|
buflist = ap->a_buflist;
|
|
len = buflist->bs_nchildren;
|
|
start_lbn = buflist->bs_children[0]->b_lblkno;
|
|
end_lbn = start_lbn + len - 1;
|
|
#if DIAGNOSTIC
|
|
for (i = 1; i < len; i++)
|
|
if (buflist->bs_children[i]->b_lblkno != start_lbn + i)
|
|
panic("ext2_reallocblks: non-cluster");
|
|
#endif
|
|
/*
|
|
* If the latest allocation is in a new cylinder group, assume that
|
|
* the filesystem has decided to move and do not force it back to
|
|
* the previous cylinder group.
|
|
*/
|
|
if (dtog(fs, dbtofsb(fs, buflist->bs_children[0]->b_blkno)) !=
|
|
dtog(fs, dbtofsb(fs, buflist->bs_children[len - 1]->b_blkno)))
|
|
return (ENOSPC);
|
|
if (ufs_getlbns(vp, start_lbn, start_ap, &start_lvl) ||
|
|
ufs_getlbns(vp, end_lbn, end_ap, &end_lvl))
|
|
return (ENOSPC);
|
|
/*
|
|
* Get the starting offset and block map for the first block.
|
|
*/
|
|
if (start_lvl == 0) {
|
|
sbap = &ip->i_db[0];
|
|
soff = start_lbn;
|
|
} else {
|
|
idp = &start_ap[start_lvl - 1];
|
|
if (bread(vp, idp->in_lbn, (int)fs->s_blocksize, NOCRED, &sbp)) {
|
|
brelse(sbp);
|
|
return (ENOSPC);
|
|
}
|
|
sbap = (daddr_t *)sbp->b_data;
|
|
soff = idp->in_off;
|
|
}
|
|
/*
|
|
* Find the preferred location for the cluster.
|
|
*/
|
|
pref = ext2_blkpref(ip, start_lbn, soff, sbap);
|
|
/*
|
|
* If the block range spans two block maps, get the second map.
|
|
*/
|
|
if (end_lvl == 0 || (idp = &end_ap[end_lvl - 1])->in_off + 1 >= len) {
|
|
ssize = len;
|
|
} else {
|
|
#if DIAGNOSTIC
|
|
if (start_ap[start_lvl-1].in_lbn == idp->in_lbn)
|
|
panic("ext2_reallocblk: start == end");
|
|
#endif
|
|
ssize = len - (idp->in_off + 1);
|
|
if (bread(vp, idp->in_lbn, (int)fs->s_blocksize, NOCRED, &ebp))
|
|
goto fail;
|
|
ebap = (daddr_t *)ebp->b_data;
|
|
}
|
|
/*
|
|
* Search the block map looking for an allocation of the desired size.
|
|
*/
|
|
if ((newblk = (daddr_t)ext2_hashalloc(ip, dtog(fs, pref), (long)pref,
|
|
len, (u_long (*)())ext2_clusteralloc)) == 0)
|
|
goto fail;
|
|
/*
|
|
* We have found a new contiguous block.
|
|
*
|
|
* First we have to replace the old block pointers with the new
|
|
* block pointers in the inode and indirect blocks associated
|
|
* with the file.
|
|
*/
|
|
blkno = newblk;
|
|
for (bap = &sbap[soff], i = 0; i < len; i++, blkno += fs->s_frags_per_block) {
|
|
if (i == ssize)
|
|
bap = ebap;
|
|
#if DIAGNOSTIC
|
|
if (buflist->bs_children[i]->b_blkno != fsbtodb(fs, *bap))
|
|
panic("ext2_reallocblks: alloc mismatch");
|
|
#endif
|
|
*bap++ = blkno;
|
|
}
|
|
/*
|
|
* Next we must write out the modified inode and indirect blocks.
|
|
* For strict correctness, the writes should be synchronous since
|
|
* the old block values may have been written to disk. In practise
|
|
* they are almost never written, but if we are concerned about
|
|
* strict correctness, the `doasyncfree' flag should be set to zero.
|
|
*
|
|
* The test on `doasyncfree' should be changed to test a flag
|
|
* that shows whether the associated buffers and inodes have
|
|
* been written. The flag should be set when the cluster is
|
|
* started and cleared whenever the buffer or inode is flushed.
|
|
* We can then check below to see if it is set, and do the
|
|
* synchronous write only when it has been cleared.
|
|
*/
|
|
if (sbap != &ip->i_db[0]) {
|
|
if (doasyncfree)
|
|
bdwrite(sbp);
|
|
else
|
|
bwrite(sbp);
|
|
} else {
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
if (!doasyncfree) {
|
|
gettime(&tv);
|
|
VOP_UPDATE(vp, &tv, &tv, MNT_WAIT);
|
|
}
|
|
}
|
|
if (ssize < len)
|
|
if (doasyncfree)
|
|
bdwrite(ebp);
|
|
else
|
|
bwrite(ebp);
|
|
/*
|
|
* Last, free the old blocks and assign the new blocks to the buffers.
|
|
*/
|
|
for (blkno = newblk, i = 0; i < len; i++, blkno += fs->s_frags_per_block) {
|
|
ext2_blkfree(ip, dbtofsb(fs, buflist->bs_children[i]->b_blkno),
|
|
fs->s_blocksize);
|
|
buflist->bs_children[i]->b_blkno = fsbtodb(fs, blkno);
|
|
}
|
|
return (0);
|
|
|
|
fail:
|
|
if (ssize < len)
|
|
brelse(ebp);
|
|
if (sbap != &ip->i_db[0])
|
|
brelse(sbp);
|
|
return (ENOSPC);
|
|
|
|
#endif /* FANCY_REALLOC */
|
|
}
|
|
|
|
/*
|
|
* Allocate an inode in the file system.
|
|
*
|
|
* we leave the actual allocation strategy to the (modified)
|
|
* ext2_new_inode(), to make sure we get the policies right
|
|
*/
|
|
int
|
|
ext2_valloc(ap)
|
|
struct vop_valloc_args /* {
|
|
struct vnode *a_pvp;
|
|
int a_mode;
|
|
struct ucred *a_cred;
|
|
struct vnode **a_vpp;
|
|
} */ *ap;
|
|
{
|
|
register struct vnode *pvp = ap->a_pvp;
|
|
register struct inode *pip;
|
|
register struct ext2_sb_info *fs;
|
|
register struct inode *ip;
|
|
mode_t mode = ap->a_mode;
|
|
ino_t ino;
|
|
int i, error;
|
|
#if !defined(__FreeBSD__)
|
|
struct timeval time;
|
|
#endif
|
|
|
|
*ap->a_vpp = NULL;
|
|
pip = VTOI(pvp);
|
|
fs = pip->i_e2fs;
|
|
if (fs->s_es->s_free_inodes_count == 0)
|
|
goto noinodes;
|
|
|
|
/* call the Linux routine - it returns the inode number only */
|
|
ino = ext2_new_inode(pip, mode);
|
|
|
|
if (ino == 0)
|
|
goto noinodes;
|
|
error = VFS_VGET(pvp->v_mount, ino, ap->a_vpp);
|
|
if (error) {
|
|
VOP_VFREE(pvp, ino, mode);
|
|
return (error);
|
|
}
|
|
ip = VTOI(*ap->a_vpp);
|
|
|
|
/*
|
|
the question is whether using VGET was such good idea at all -
|
|
Linux doesn't read the old inode in when it's allocating a
|
|
new one. I will set at least i_size & i_blocks the zero.
|
|
*/
|
|
ip->i_mode = 0;
|
|
ip->i_size = 0;
|
|
ip->i_blocks = 0;
|
|
ip->i_flags = 0;
|
|
/* now we want to make sure that the block pointers are zeroed out */
|
|
for(i = 0; i < EXT2_NDIR_BLOCKS; i++)
|
|
ip->i_db[i] = 0;
|
|
|
|
/*
|
|
* Set up a new generation number for this inode.
|
|
* XXX check if this makes sense in ext2
|
|
*/
|
|
#if !defined(__FreeBSD__)
|
|
gettime(&time);
|
|
#endif
|
|
if (++nextgennumber < (u_long)time.tv_sec)
|
|
nextgennumber = time.tv_sec;
|
|
ip->i_gen = nextgennumber;
|
|
/*
|
|
printf("ext2_valloc: allocated inode %d\n", ino);
|
|
*/
|
|
return (0);
|
|
noinodes:
|
|
ext2_fserr(fs, ap->a_cred->cr_uid, "out of inodes");
|
|
uprintf("\n%s: create/symlink failed, no inodes free\n", fs->fs_fsmnt);
|
|
return (ENOSPC);
|
|
}
|
|
|
|
/*
|
|
* Select the desired position for the next block in a file.
|
|
*
|
|
* we try to mimic what Remy does in inode_getblk/block_getblk
|
|
*
|
|
* we note: blocknr == 0 means that we're about to allocate either
|
|
* a direct block or a pointer block at the first level of indirection
|
|
* (In other words, stuff that will go in i_db[] or i_ib[])
|
|
*
|
|
* blocknr != 0 means that we're allocating a block that is none
|
|
* of the above. Then, blocknr tells us the number of the block
|
|
* that will hold the pointer
|
|
*/
|
|
daddr_t
|
|
ext2_blkpref(ip, lbn, indx, bap, blocknr)
|
|
struct inode *ip;
|
|
daddr_t lbn;
|
|
int indx;
|
|
daddr_t *bap;
|
|
daddr_t blocknr;
|
|
{
|
|
int tmp;
|
|
|
|
/* if the next block is actually what we thought it is,
|
|
then set the goal to what we thought it should be
|
|
*/
|
|
if(ip->i_next_alloc_block == lbn)
|
|
return ip->i_next_alloc_goal;
|
|
|
|
/* now check whether we were provided with an array that basically
|
|
tells us previous blocks to which we want to stay closeby
|
|
*/
|
|
if(bap)
|
|
for (tmp = indx - 1; tmp >= 0; tmp--)
|
|
if (bap[tmp])
|
|
return bap[tmp];
|
|
|
|
/* else let's fall back to the blocknr, or, if there is none,
|
|
follow the rule that a block should be allocated near it's inode
|
|
*/
|
|
return blocknr ? blocknr :
|
|
(daddr_t)(ip->i_block_group *
|
|
EXT2_BLOCKS_PER_GROUP(ip->i_e2fs)) +
|
|
ip->i_e2fs->s_es->s_first_data_block;
|
|
}
|
|
|
|
/*
|
|
* Free a block or fragment.
|
|
*
|
|
* pass on to the Linux code
|
|
*/
|
|
void
|
|
ext2_blkfree(ip, bno, size)
|
|
register struct inode *ip;
|
|
daddr_t bno;
|
|
long size;
|
|
{
|
|
register struct ext2_sb_info *fs;
|
|
|
|
fs = ip->i_e2fs;
|
|
/*
|
|
* call Linux code with mount *, block number, count
|
|
*/
|
|
ext2_free_blocks(ITOV(ip)->v_mount, bno, size / fs->s_frag_size);
|
|
}
|
|
|
|
/*
|
|
* Free an inode.
|
|
*
|
|
* the maintenance of the actual bitmaps is again up to the linux code
|
|
*/
|
|
int
|
|
ext2_vfree(ap)
|
|
struct vop_vfree_args /* {
|
|
struct vnode *a_pvp;
|
|
ino_t a_ino;
|
|
int a_mode;
|
|
} */ *ap;
|
|
{
|
|
register struct ext2_sb_info *fs;
|
|
register struct inode *pip;
|
|
ino_t ino = ap->a_ino;
|
|
int mode;
|
|
|
|
pip = VTOI(ap->a_pvp);
|
|
fs = pip->i_e2fs;
|
|
if ((u_int)ino >= fs->s_inodes_per_group * fs->s_groups_count)
|
|
panic("ifree: range: dev = 0x%x, ino = %d, fs = %s\n",
|
|
pip->i_dev, ino, fs->fs_fsmnt);
|
|
|
|
/* ext2_debug("ext2_vfree (%d, %d) called\n", pip->i_number, ap->a_mode);
|
|
*/
|
|
ext2_discard_prealloc(pip);
|
|
|
|
/* we need to make sure that ext2_free_inode can adjust the
|
|
used_dir_counts in the group summary information - I'd
|
|
really like to know what the rationale behind this
|
|
'set i_mode to zero to denote an unused inode' is
|
|
*/
|
|
mode = pip->i_mode;
|
|
pip->i_mode = ap->a_mode;
|
|
ext2_free_inode(pip);
|
|
pip->i_mode = mode;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Fserr prints the name of a file system with an error diagnostic.
|
|
*
|
|
* The form of the error message is:
|
|
* fs: error message
|
|
*/
|
|
static void
|
|
ext2_fserr(fs, uid, cp)
|
|
struct ext2_sb_info *fs;
|
|
u_int uid;
|
|
char *cp;
|
|
{
|
|
|
|
log(LOG_ERR, "uid %d on %s: %s\n", uid, fs->fs_fsmnt, cp);
|
|
}
|