freebsd-skq/sys/fs/nandfs/bmap.c
imp 58c9460670 nandfs_meta_bread() calls bread() which can set bp to NULL in some
error cases. Calling brelse() with a NULL pointer is not allowed,
so only call brelse() when the bp is non-NULL.

Reported by: Maxime Villard (reported as uninitialized variable)
2015-03-01 21:41:37 +00:00

624 lines
14 KiB
C

/*-
* Copyright (c) 2012 Semihalf
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/kernel.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/bio.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/signalvar.h>
#include <sys/malloc.h>
#include <sys/dirent.h>
#include <sys/lockf.h>
#include <sys/ktr.h>
#include <sys/kdb.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_object.h>
#include <vm/vnode_pager.h>
#include <machine/_inttypes.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_object.h>
#include <vm/vnode_pager.h>
#include "nandfs_mount.h"
#include "nandfs.h"
#include "nandfs_subr.h"
#include "bmap.h"
static int bmap_getlbns(struct nandfs_node *, nandfs_lbn_t,
struct nandfs_indir *, int *);
int
bmap_lookup(struct nandfs_node *node, nandfs_lbn_t lblk, nandfs_daddr_t *vblk)
{
struct nandfs_inode *ip;
struct nandfs_indir a[NIADDR + 1], *ap;
nandfs_daddr_t daddr;
struct buf *bp;
int error;
int num, *nump;
DPRINTF(BMAP, ("%s: node %p lblk %jx enter\n", __func__, node, lblk));
ip = &node->nn_inode;
ap = a;
nump = &num;
error = bmap_getlbns(node, lblk, ap, nump);
if (error)
return (error);
if (num == 0) {
*vblk = ip->i_db[lblk];
return (0);
}
DPRINTF(BMAP, ("%s: node %p lblk=%jx trying ip->i_ib[%x]\n", __func__,
node, lblk, ap->in_off));
daddr = ip->i_ib[ap->in_off];
for (bp = NULL, ++ap; --num; ap++) {
if (daddr == 0) {
DPRINTF(BMAP, ("%s: node %p lblk=%jx returning with "
"vblk 0\n", __func__, node, lblk));
*vblk = 0;
return (0);
}
if (ap->in_lbn == lblk) {
DPRINTF(BMAP, ("%s: node %p lblk=%jx ap->in_lbn=%jx "
"returning address of indirect block (%jx)\n",
__func__, node, lblk, ap->in_lbn, daddr));
*vblk = daddr;
return (0);
}
DPRINTF(BMAP, ("%s: node %p lblk=%jx reading block "
"ap->in_lbn=%jx\n", __func__, node, lblk, ap->in_lbn));
error = nandfs_bread_meta(node, ap->in_lbn, NOCRED, 0, &bp);
if (error) {
brelse(bp);
return (error);
}
daddr = ((nandfs_daddr_t *)bp->b_data)[ap->in_off];
brelse(bp);
}
DPRINTF(BMAP, ("%s: node %p lblk=%jx returning with %jx\n", __func__,
node, lblk, daddr));
*vblk = daddr;
return (0);
}
int
bmap_dirty_meta(struct nandfs_node *node, nandfs_lbn_t lblk, int force)
{
struct nandfs_indir a[NIADDR+1], *ap;
#ifdef DEBUG
nandfs_daddr_t daddr;
#endif
struct buf *bp;
int error;
int num, *nump;
DPRINTF(BMAP, ("%s: node %p lblk=%jx\n", __func__, node, lblk));
ap = a;
nump = &num;
error = bmap_getlbns(node, lblk, ap, nump);
if (error)
return (error);
/*
* Direct block, nothing to do
*/
if (num == 0)
return (0);
DPRINTF(BMAP, ("%s: node %p reading blocks\n", __func__, node));
for (bp = NULL, ++ap; --num; ap++) {
error = nandfs_bread_meta(node, ap->in_lbn, NOCRED, 0, &bp);
if (error) {
brelse(bp);
return (error);
}
#ifdef DEBUG
daddr = ((nandfs_daddr_t *)bp->b_data)[ap->in_off];
MPASS(daddr != 0 || node->nn_ino == 3);
#endif
error = nandfs_dirty_buf_meta(bp, force);
if (error)
return (error);
}
return (0);
}
int
bmap_insert_block(struct nandfs_node *node, nandfs_lbn_t lblk,
nandfs_daddr_t vblk)
{
struct nandfs_inode *ip;
struct nandfs_indir a[NIADDR+1], *ap;
struct buf *bp;
nandfs_daddr_t daddr;
int error;
int num, *nump, i;
DPRINTF(BMAP, ("%s: node %p lblk=%jx vblk=%jx\n", __func__, node, lblk,
vblk));
ip = &node->nn_inode;
ap = a;
nump = &num;
error = bmap_getlbns(node, lblk, ap, nump);
if (error)
return (error);
DPRINTF(BMAP, ("%s: node %p lblk=%jx vblk=%jx got num=%d\n", __func__,
node, lblk, vblk, num));
if (num == 0) {
DPRINTF(BMAP, ("%s: node %p lblk=%jx direct block\n", __func__,
node, lblk));
ip->i_db[lblk] = vblk;
return (0);
}
DPRINTF(BMAP, ("%s: node %p lblk=%jx indirect block level %d\n",
__func__, node, lblk, ap->in_off));
if (num == 1) {
DPRINTF(BMAP, ("%s: node %p lblk=%jx indirect block: inserting "
"%jx as vblk for indirect block %d\n", __func__, node,
lblk, vblk, ap->in_off));
ip->i_ib[ap->in_off] = vblk;
return (0);
}
bp = NULL;
daddr = ip->i_ib[a[0].in_off];
for (i = 1; i < num; i++) {
if (bp)
brelse(bp);
if (daddr == 0) {
DPRINTF(BMAP, ("%s: node %p lblk=%jx vblk=%jx create "
"block %jx %d\n", __func__, node, lblk, vblk,
a[i].in_lbn, a[i].in_off));
error = nandfs_bcreate_meta(node, a[i].in_lbn, NOCRED,
0, &bp);
if (error)
return (error);
} else {
DPRINTF(BMAP, ("%s: node %p lblk=%jx vblk=%jx read "
"block %jx %d\n", __func__, node, daddr, vblk,
a[i].in_lbn, a[i].in_off));
error = nandfs_bread_meta(node, a[i].in_lbn, NOCRED, 0, &bp);
if (error) {
brelse(bp);
return (error);
}
}
daddr = ((nandfs_daddr_t *)bp->b_data)[a[i].in_off];
}
i--;
DPRINTF(BMAP,
("%s: bmap node %p lblk=%jx vblk=%jx inserting vblk level %d at "
"offset %d at %jx\n", __func__, node, lblk, vblk, i, a[i].in_off,
daddr));
if (!bp) {
nandfs_error("%s: cannot find indirect block\n", __func__);
return (-1);
}
((nandfs_daddr_t *)bp->b_data)[a[i].in_off] = vblk;
error = nandfs_dirty_buf_meta(bp, 0);
if (error) {
nandfs_warning("%s: dirty failed buf: %p\n", __func__, bp);
return (error);
}
DPRINTF(BMAP, ("%s: exiting node %p lblk=%jx vblk=%jx\n", __func__,
node, lblk, vblk));
return (error);
}
CTASSERT(NIADDR <= 3);
#define SINGLE 0 /* index of single indirect block */
#define DOUBLE 1 /* index of double indirect block */
#define TRIPLE 2 /* index of triple indirect block */
static __inline nandfs_lbn_t
lbn_offset(struct nandfs_device *fsdev, int level)
{
nandfs_lbn_t res;
for (res = 1; level > 0; level--)
res *= MNINDIR(fsdev);
return (res);
}
static nandfs_lbn_t
blocks_inside(struct nandfs_device *fsdev, int level, struct nandfs_indir *nip)
{
nandfs_lbn_t blocks;
for (blocks = 1; level >= SINGLE; level--, nip++) {
MPASS(nip->in_off >= 0 && nip->in_off < MNINDIR(fsdev));
blocks += nip->in_off * lbn_offset(fsdev, level);
}
return (blocks);
}
static int
bmap_truncate_indirect(struct nandfs_node *node, int level, nandfs_lbn_t *left,
int *cleaned, struct nandfs_indir *ap, struct nandfs_indir *fp,
nandfs_daddr_t *copy)
{
struct buf *bp;
nandfs_lbn_t i, lbn, nlbn, factor, tosub;
struct nandfs_device *fsdev;
int error, lcleaned, modified;
DPRINTF(BMAP, ("%s: node %p level %d left %jx\n", __func__,
node, level, *left));
fsdev = node->nn_nandfsdev;
MPASS(ap->in_off >= 0 && ap->in_off < MNINDIR(fsdev));
factor = lbn_offset(fsdev, level);
lbn = ap->in_lbn;
error = nandfs_bread_meta(node, lbn, NOCRED, 0, &bp);
if (error) {
if (bp != NULL)
brelse(bp);
return (error);
}
bcopy(bp->b_data, copy, fsdev->nd_blocksize);
bqrelse(bp);
modified = 0;
i = ap->in_off;
if (ap != fp)
ap++;
for (nlbn = lbn + 1 - i * factor; i >= 0 && *left > 0; i--,
nlbn += factor) {
lcleaned = 0;
DPRINTF(BMAP,
("%s: node %p i=%jx nlbn=%jx left=%jx ap=%p vblk %jx\n",
__func__, node, i, nlbn, *left, ap, copy[i]));
if (copy[i] == 0) {
tosub = blocks_inside(fsdev, level - 1, ap);
if (tosub > *left)
tosub = 0;
*left -= tosub;
} else {
if (level > SINGLE) {
if (ap == fp)
ap->in_lbn = nlbn;
error = bmap_truncate_indirect(node, level - 1,
left, &lcleaned, ap, fp,
copy + MNINDIR(fsdev));
if (error)
return (error);
} else {
error = nandfs_bdestroy(node, copy[i]);
if (error)
return (error);
lcleaned = 1;
*left -= 1;
}
}
if (lcleaned) {
if (level > SINGLE) {
error = nandfs_vblock_end(fsdev, copy[i]);
if (error)
return (error);
}
copy[i] = 0;
modified++;
}
ap = fp;
}
if (i == -1)
*cleaned = 1;
error = nandfs_bread_meta(node, lbn, NOCRED, 0, &bp);
if (error) {
brelse(bp);
return (error);
}
if (modified)
bcopy(copy, bp->b_data, fsdev->nd_blocksize);
/* Force success even if we can't dirty the buffer metadata when freeing space */
nandfs_dirty_buf_meta(bp, 1);
return (0);
}
int
bmap_truncate_mapping(struct nandfs_node *node, nandfs_lbn_t lastblk,
nandfs_lbn_t todo)
{
struct nandfs_inode *ip;
struct nandfs_indir a[NIADDR + 1], f[NIADDR], *ap;
nandfs_daddr_t indir_lbn[NIADDR];
nandfs_daddr_t *copy;
int error, level;
nandfs_lbn_t left, tosub;
struct nandfs_device *fsdev;
int cleaned, i;
int num, *nump;
DPRINTF(BMAP, ("%s: node %p lastblk %jx truncating by %jx\n", __func__,
node, lastblk, todo));
ip = &node->nn_inode;
fsdev = node->nn_nandfsdev;
ap = a;
nump = &num;
error = bmap_getlbns(node, lastblk, ap, nump);
if (error)
return (error);
indir_lbn[SINGLE] = -NDADDR;
indir_lbn[DOUBLE] = indir_lbn[SINGLE] - MNINDIR(fsdev) - 1;
indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - MNINDIR(fsdev)
* MNINDIR(fsdev) - 1;
for (i = 0; i < NIADDR; i++) {
f[i].in_off = MNINDIR(fsdev) - 1;
f[i].in_lbn = 0xdeadbeef;
}
left = todo;
#ifdef DEBUG
a[num].in_off = -1;
#endif
ap++;
num -= 2;
if (num < 0)
goto direct;
copy = malloc(MNINDIR(fsdev) * sizeof(nandfs_daddr_t) * (num + 1),
M_NANDFSTEMP, M_WAITOK);
for (level = num; level >= SINGLE && left > 0; level--) {
cleaned = 0;
if (ip->i_ib[level] == 0) {
tosub = blocks_inside(fsdev, level, ap);
if (tosub > left)
left = 0;
else
left -= tosub;
} else {
if (ap == f)
ap->in_lbn = indir_lbn[level];
error = bmap_truncate_indirect(node, level, &left,
&cleaned, ap, f, copy);
if (error) {
free(copy, M_NANDFSTEMP);
nandfs_error("%s: error %d when truncate "
"at level %d\n", __func__, error, level);
return (error);
}
}
if (cleaned) {
nandfs_vblock_end(fsdev, ip->i_ib[level]);
ip->i_ib[level] = 0;
}
ap = f;
}
free(copy, M_NANDFSTEMP);
direct:
if (num < 0)
i = lastblk;
else
i = NDADDR - 1;
for (; i >= 0 && left > 0; i--) {
if (ip->i_db[i] != 0) {
error = nandfs_bdestroy(node, ip->i_db[i]);
if (error) {
nandfs_error("%s: cannot destroy "
"block %jx, error %d\n", __func__,
(uintmax_t)ip->i_db[i], error);
return (error);
}
ip->i_db[i] = 0;
}
left--;
}
KASSERT(left == 0,
("truncated wrong number of blocks (%jd should be 0)", left));
return (error);
}
nandfs_lbn_t
get_maxfilesize(struct nandfs_device *fsdev)
{
struct nandfs_indir f[NIADDR];
nandfs_lbn_t max;
int i;
max = NDADDR;
for (i = 0; i < NIADDR; i++) {
f[i].in_off = MNINDIR(fsdev) - 1;
max += blocks_inside(fsdev, i, f);
}
max *= fsdev->nd_blocksize;
return (max);
}
/*
* This is ufs_getlbns with minor modifications.
*/
/*
* Create an array of logical block number/offset pairs which represent the
* path of indirect blocks required to access a data block. The first "pair"
* contains the logical block number of the appropriate single, double or
* triple indirect block and the offset into the inode indirect block array.
* Note, the logical block number of the inode single/double/triple indirect
* block appears twice in the array, once with the offset into the i_ib and
* once with the offset into the page itself.
*/
static int
bmap_getlbns(struct nandfs_node *node, nandfs_lbn_t bn, struct nandfs_indir *ap, int *nump)
{
nandfs_daddr_t blockcnt;
nandfs_lbn_t metalbn, realbn;
struct nandfs_device *fsdev;
int i, numlevels, off;
fsdev = node->nn_nandfsdev;
DPRINTF(BMAP, ("%s: node %p bn=%jx mnindir=%zd enter\n", __func__,
node, bn, MNINDIR(fsdev)));
if (nump)
*nump = 0;
numlevels = 0;
realbn = bn;
if (bn < 0)
bn = -bn;
/* The first NDADDR blocks are direct blocks. */
if (bn < NDADDR)
return (0);
/*
* Determine the number of levels of indirection. After this loop
* is done, blockcnt indicates the number of data blocks possible
* at the previous level of indirection, and NIADDR - i is the number
* of levels of indirection needed to locate the requested block.
*/
for (blockcnt = 1, i = NIADDR, bn -= NDADDR;; i--, bn -= blockcnt) {
DPRINTF(BMAP, ("%s: blockcnt=%jd i=%d bn=%jd\n", __func__,
blockcnt, i, bn));
if (i == 0)
return (EFBIG);
blockcnt *= MNINDIR(fsdev);
if (bn < blockcnt)
break;
}
/* Calculate the address of the first meta-block. */
if (realbn >= 0)
metalbn = -(realbn - bn + NIADDR - i);
else
metalbn = -(-realbn - bn + NIADDR - i);
/*
* At each iteration, off is the offset into the bap array which is
* an array of disk addresses at the current level of indirection.
* The logical block number and the offset in that block are stored
* into the argument array.
*/
ap->in_lbn = metalbn;
ap->in_off = off = NIADDR - i;
DPRINTF(BMAP, ("%s: initial: ap->in_lbn=%jx ap->in_off=%d\n", __func__,
metalbn, off));
ap++;
for (++numlevels; i <= NIADDR; i++) {
/* If searching for a meta-data block, quit when found. */
if (metalbn == realbn)
break;
blockcnt /= MNINDIR(fsdev);
off = (bn / blockcnt) % MNINDIR(fsdev);
++numlevels;
ap->in_lbn = metalbn;
ap->in_off = off;
DPRINTF(BMAP, ("%s: in_lbn=%jx in_off=%d\n", __func__,
ap->in_lbn, ap->in_off));
++ap;
metalbn -= -1 + off * blockcnt;
}
if (nump)
*nump = numlevels;
DPRINTF(BMAP, ("%s: numlevels=%d\n", __func__, numlevels));
return (0);
}