mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-01 06:33:07 +00:00
![Dave Chinner](/assets/img/avatar_default.png)
Convert the xfs_sb_version_hasfoo() to checks against
mp->m_features. Checks of the superblock itself during disk
operations (e.g. in the read/write verifiers and the to/from disk
formatters) are not converted - they operate purely on the
superblock state. Everything else should use the mount features.
Large parts of this conversion were done with sed with commands like
this:
for f in `git grep -l xfs_sb_version_has fs/xfs/*.c`; do
sed -i -e 's/xfs_sb_version_has\(.*\)(&\(.*\)->m_sb)/xfs_has_\1(\2)/' $f
done
With manual cleanups for things like "xfs_has_extflgbit" and other
little inconsistencies in naming.
The result is ia lot less typing to check features and an XFS binary
size reduced by a bit over 3kB:
$ size -t fs/xfs/built-in.a
text data bss dec hex filenam
before 1130866 311352 484 1442702
16038e (TOTALS)
after 1127727 311352 484 1439563 15f74b (TOTALS)
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
527 lines
14 KiB
C
527 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2017 Oracle. All Rights Reserved.
|
|
* Author: Darrick J. Wong <darrick.wong@oracle.com>
|
|
*/
|
|
#include "xfs.h"
|
|
#include "xfs_fs.h"
|
|
#include "xfs_shared.h"
|
|
#include "xfs_format.h"
|
|
#include "xfs_trans_resv.h"
|
|
#include "xfs_mount.h"
|
|
#include "xfs_log_format.h"
|
|
#include "xfs_inode.h"
|
|
#include "xfs_da_format.h"
|
|
#include "xfs_da_btree.h"
|
|
#include "xfs_attr.h"
|
|
#include "xfs_attr_leaf.h"
|
|
#include "scrub/scrub.h"
|
|
#include "scrub/common.h"
|
|
#include "scrub/dabtree.h"
|
|
#include "scrub/attr.h"
|
|
|
|
/*
|
|
* Allocate enough memory to hold an attr value and attr block bitmaps,
|
|
* reallocating the buffer if necessary. Buffer contents are not preserved
|
|
* across a reallocation.
|
|
*/
|
|
static int
|
|
xchk_setup_xattr_buf(
|
|
struct xfs_scrub *sc,
|
|
size_t value_size,
|
|
gfp_t flags)
|
|
{
|
|
size_t sz;
|
|
struct xchk_xattr_buf *ab = sc->buf;
|
|
|
|
/*
|
|
* We need enough space to read an xattr value from the file or enough
|
|
* space to hold three copies of the xattr free space bitmap. We don't
|
|
* need the buffer space for both purposes at the same time.
|
|
*/
|
|
sz = 3 * sizeof(long) * BITS_TO_LONGS(sc->mp->m_attr_geo->blksize);
|
|
sz = max_t(size_t, sz, value_size);
|
|
|
|
/*
|
|
* If there's already a buffer, figure out if we need to reallocate it
|
|
* to accommodate a larger size.
|
|
*/
|
|
if (ab) {
|
|
if (sz <= ab->sz)
|
|
return 0;
|
|
kmem_free(ab);
|
|
sc->buf = NULL;
|
|
}
|
|
|
|
/*
|
|
* Don't zero the buffer upon allocation to avoid runtime overhead.
|
|
* All users must be careful never to read uninitialized contents.
|
|
*/
|
|
ab = kvmalloc(sizeof(*ab) + sz, flags);
|
|
if (!ab)
|
|
return -ENOMEM;
|
|
|
|
ab->sz = sz;
|
|
sc->buf = ab;
|
|
return 0;
|
|
}
|
|
|
|
/* Set us up to scrub an inode's extended attributes. */
|
|
int
|
|
xchk_setup_xattr(
|
|
struct xfs_scrub *sc)
|
|
{
|
|
int error;
|
|
|
|
/*
|
|
* We failed to get memory while checking attrs, so this time try to
|
|
* get all the memory we're ever going to need. Allocate the buffer
|
|
* without the inode lock held, which means we can sleep.
|
|
*/
|
|
if (sc->flags & XCHK_TRY_HARDER) {
|
|
error = xchk_setup_xattr_buf(sc, XATTR_SIZE_MAX, GFP_KERNEL);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
return xchk_setup_inode_contents(sc, 0);
|
|
}
|
|
|
|
/* Extended Attributes */
|
|
|
|
struct xchk_xattr {
|
|
struct xfs_attr_list_context context;
|
|
struct xfs_scrub *sc;
|
|
};
|
|
|
|
/*
|
|
* Check that an extended attribute key can be looked up by hash.
|
|
*
|
|
* We use the XFS attribute list iterator (i.e. xfs_attr_list_ilocked)
|
|
* to call this function for every attribute key in an inode. Once
|
|
* we're here, we load the attribute value to see if any errors happen,
|
|
* or if we get more or less data than we expected.
|
|
*/
|
|
static void
|
|
xchk_xattr_listent(
|
|
struct xfs_attr_list_context *context,
|
|
int flags,
|
|
unsigned char *name,
|
|
int namelen,
|
|
int valuelen)
|
|
{
|
|
struct xchk_xattr *sx;
|
|
struct xfs_da_args args = { NULL };
|
|
int error = 0;
|
|
|
|
sx = container_of(context, struct xchk_xattr, context);
|
|
|
|
if (xchk_should_terminate(sx->sc, &error)) {
|
|
context->seen_enough = error;
|
|
return;
|
|
}
|
|
|
|
if (flags & XFS_ATTR_INCOMPLETE) {
|
|
/* Incomplete attr key, just mark the inode for preening. */
|
|
xchk_ino_set_preen(sx->sc, context->dp->i_ino);
|
|
return;
|
|
}
|
|
|
|
/* Does this name make sense? */
|
|
if (!xfs_attr_namecheck(name, namelen)) {
|
|
xchk_fblock_set_corrupt(sx->sc, XFS_ATTR_FORK, args.blkno);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Try to allocate enough memory to extrat the attr value. If that
|
|
* doesn't work, we overload the seen_enough variable to convey
|
|
* the error message back to the main scrub function.
|
|
*/
|
|
error = xchk_setup_xattr_buf(sx->sc, valuelen,
|
|
GFP_KERNEL | __GFP_RETRY_MAYFAIL);
|
|
if (error == -ENOMEM)
|
|
error = -EDEADLOCK;
|
|
if (error) {
|
|
context->seen_enough = error;
|
|
return;
|
|
}
|
|
|
|
args.op_flags = XFS_DA_OP_NOTIME;
|
|
args.attr_filter = flags & XFS_ATTR_NSP_ONDISK_MASK;
|
|
args.geo = context->dp->i_mount->m_attr_geo;
|
|
args.whichfork = XFS_ATTR_FORK;
|
|
args.dp = context->dp;
|
|
args.name = name;
|
|
args.namelen = namelen;
|
|
args.hashval = xfs_da_hashname(args.name, args.namelen);
|
|
args.trans = context->tp;
|
|
args.value = xchk_xattr_valuebuf(sx->sc);
|
|
args.valuelen = valuelen;
|
|
|
|
error = xfs_attr_get_ilocked(&args);
|
|
/* ENODATA means the hash lookup failed and the attr is bad */
|
|
if (error == -ENODATA)
|
|
error = -EFSCORRUPTED;
|
|
if (!xchk_fblock_process_error(sx->sc, XFS_ATTR_FORK, args.blkno,
|
|
&error))
|
|
goto fail_xref;
|
|
if (args.valuelen != valuelen)
|
|
xchk_fblock_set_corrupt(sx->sc, XFS_ATTR_FORK,
|
|
args.blkno);
|
|
fail_xref:
|
|
if (sx->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
|
|
context->seen_enough = 1;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Mark a range [start, start+len) in this map. Returns true if the
|
|
* region was free, and false if there's a conflict or a problem.
|
|
*
|
|
* Within a char, the lowest bit of the char represents the byte with
|
|
* the smallest address
|
|
*/
|
|
STATIC bool
|
|
xchk_xattr_set_map(
|
|
struct xfs_scrub *sc,
|
|
unsigned long *map,
|
|
unsigned int start,
|
|
unsigned int len)
|
|
{
|
|
unsigned int mapsize = sc->mp->m_attr_geo->blksize;
|
|
bool ret = true;
|
|
|
|
if (start >= mapsize)
|
|
return false;
|
|
if (start + len > mapsize) {
|
|
len = mapsize - start;
|
|
ret = false;
|
|
}
|
|
|
|
if (find_next_bit(map, mapsize, start) < start + len)
|
|
ret = false;
|
|
bitmap_set(map, start, len);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Check the leaf freemap from the usage bitmap. Returns false if the
|
|
* attr freemap has problems or points to used space.
|
|
*/
|
|
STATIC bool
|
|
xchk_xattr_check_freemap(
|
|
struct xfs_scrub *sc,
|
|
unsigned long *map,
|
|
struct xfs_attr3_icleaf_hdr *leafhdr)
|
|
{
|
|
unsigned long *freemap = xchk_xattr_freemap(sc);
|
|
unsigned long *dstmap = xchk_xattr_dstmap(sc);
|
|
unsigned int mapsize = sc->mp->m_attr_geo->blksize;
|
|
int i;
|
|
|
|
/* Construct bitmap of freemap contents. */
|
|
bitmap_zero(freemap, mapsize);
|
|
for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) {
|
|
if (!xchk_xattr_set_map(sc, freemap,
|
|
leafhdr->freemap[i].base,
|
|
leafhdr->freemap[i].size))
|
|
return false;
|
|
}
|
|
|
|
/* Look for bits that are set in freemap and are marked in use. */
|
|
return bitmap_and(dstmap, freemap, map, mapsize) == 0;
|
|
}
|
|
|
|
/*
|
|
* Check this leaf entry's relations to everything else.
|
|
* Returns the number of bytes used for the name/value data.
|
|
*/
|
|
STATIC void
|
|
xchk_xattr_entry(
|
|
struct xchk_da_btree *ds,
|
|
int level,
|
|
char *buf_end,
|
|
struct xfs_attr_leafblock *leaf,
|
|
struct xfs_attr3_icleaf_hdr *leafhdr,
|
|
struct xfs_attr_leaf_entry *ent,
|
|
int idx,
|
|
unsigned int *usedbytes,
|
|
__u32 *last_hashval)
|
|
{
|
|
struct xfs_mount *mp = ds->state->mp;
|
|
unsigned long *usedmap = xchk_xattr_usedmap(ds->sc);
|
|
char *name_end;
|
|
struct xfs_attr_leaf_name_local *lentry;
|
|
struct xfs_attr_leaf_name_remote *rentry;
|
|
unsigned int nameidx;
|
|
unsigned int namesize;
|
|
|
|
if (ent->pad2 != 0)
|
|
xchk_da_set_corrupt(ds, level);
|
|
|
|
/* Hash values in order? */
|
|
if (be32_to_cpu(ent->hashval) < *last_hashval)
|
|
xchk_da_set_corrupt(ds, level);
|
|
*last_hashval = be32_to_cpu(ent->hashval);
|
|
|
|
nameidx = be16_to_cpu(ent->nameidx);
|
|
if (nameidx < leafhdr->firstused ||
|
|
nameidx >= mp->m_attr_geo->blksize) {
|
|
xchk_da_set_corrupt(ds, level);
|
|
return;
|
|
}
|
|
|
|
/* Check the name information. */
|
|
if (ent->flags & XFS_ATTR_LOCAL) {
|
|
lentry = xfs_attr3_leaf_name_local(leaf, idx);
|
|
namesize = xfs_attr_leaf_entsize_local(lentry->namelen,
|
|
be16_to_cpu(lentry->valuelen));
|
|
name_end = (char *)lentry + namesize;
|
|
if (lentry->namelen == 0)
|
|
xchk_da_set_corrupt(ds, level);
|
|
} else {
|
|
rentry = xfs_attr3_leaf_name_remote(leaf, idx);
|
|
namesize = xfs_attr_leaf_entsize_remote(rentry->namelen);
|
|
name_end = (char *)rentry + namesize;
|
|
if (rentry->namelen == 0 || rentry->valueblk == 0)
|
|
xchk_da_set_corrupt(ds, level);
|
|
}
|
|
if (name_end > buf_end)
|
|
xchk_da_set_corrupt(ds, level);
|
|
|
|
if (!xchk_xattr_set_map(ds->sc, usedmap, nameidx, namesize))
|
|
xchk_da_set_corrupt(ds, level);
|
|
if (!(ds->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
|
|
*usedbytes += namesize;
|
|
}
|
|
|
|
/* Scrub an attribute leaf. */
|
|
STATIC int
|
|
xchk_xattr_block(
|
|
struct xchk_da_btree *ds,
|
|
int level)
|
|
{
|
|
struct xfs_attr3_icleaf_hdr leafhdr;
|
|
struct xfs_mount *mp = ds->state->mp;
|
|
struct xfs_da_state_blk *blk = &ds->state->path.blk[level];
|
|
struct xfs_buf *bp = blk->bp;
|
|
xfs_dablk_t *last_checked = ds->private;
|
|
struct xfs_attr_leafblock *leaf = bp->b_addr;
|
|
struct xfs_attr_leaf_entry *ent;
|
|
struct xfs_attr_leaf_entry *entries;
|
|
unsigned long *usedmap;
|
|
char *buf_end;
|
|
size_t off;
|
|
__u32 last_hashval = 0;
|
|
unsigned int usedbytes = 0;
|
|
unsigned int hdrsize;
|
|
int i;
|
|
int error;
|
|
|
|
if (*last_checked == blk->blkno)
|
|
return 0;
|
|
|
|
/* Allocate memory for block usage checking. */
|
|
error = xchk_setup_xattr_buf(ds->sc, 0,
|
|
GFP_KERNEL | __GFP_RETRY_MAYFAIL);
|
|
if (error == -ENOMEM)
|
|
return -EDEADLOCK;
|
|
if (error)
|
|
return error;
|
|
usedmap = xchk_xattr_usedmap(ds->sc);
|
|
|
|
*last_checked = blk->blkno;
|
|
bitmap_zero(usedmap, mp->m_attr_geo->blksize);
|
|
|
|
/* Check all the padding. */
|
|
if (xfs_has_crc(ds->sc->mp)) {
|
|
struct xfs_attr3_leafblock *leaf = bp->b_addr;
|
|
|
|
if (leaf->hdr.pad1 != 0 || leaf->hdr.pad2 != 0 ||
|
|
leaf->hdr.info.hdr.pad != 0)
|
|
xchk_da_set_corrupt(ds, level);
|
|
} else {
|
|
if (leaf->hdr.pad1 != 0 || leaf->hdr.info.pad != 0)
|
|
xchk_da_set_corrupt(ds, level);
|
|
}
|
|
|
|
/* Check the leaf header */
|
|
xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &leafhdr, leaf);
|
|
hdrsize = xfs_attr3_leaf_hdr_size(leaf);
|
|
|
|
if (leafhdr.usedbytes > mp->m_attr_geo->blksize)
|
|
xchk_da_set_corrupt(ds, level);
|
|
if (leafhdr.firstused > mp->m_attr_geo->blksize)
|
|
xchk_da_set_corrupt(ds, level);
|
|
if (leafhdr.firstused < hdrsize)
|
|
xchk_da_set_corrupt(ds, level);
|
|
if (!xchk_xattr_set_map(ds->sc, usedmap, 0, hdrsize))
|
|
xchk_da_set_corrupt(ds, level);
|
|
|
|
if (ds->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
|
|
goto out;
|
|
|
|
entries = xfs_attr3_leaf_entryp(leaf);
|
|
if ((char *)&entries[leafhdr.count] > (char *)leaf + leafhdr.firstused)
|
|
xchk_da_set_corrupt(ds, level);
|
|
|
|
buf_end = (char *)bp->b_addr + mp->m_attr_geo->blksize;
|
|
for (i = 0, ent = entries; i < leafhdr.count; ent++, i++) {
|
|
/* Mark the leaf entry itself. */
|
|
off = (char *)ent - (char *)leaf;
|
|
if (!xchk_xattr_set_map(ds->sc, usedmap, off,
|
|
sizeof(xfs_attr_leaf_entry_t))) {
|
|
xchk_da_set_corrupt(ds, level);
|
|
goto out;
|
|
}
|
|
|
|
/* Check the entry and nameval. */
|
|
xchk_xattr_entry(ds, level, buf_end, leaf, &leafhdr,
|
|
ent, i, &usedbytes, &last_hashval);
|
|
|
|
if (ds->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
|
|
goto out;
|
|
}
|
|
|
|
if (!xchk_xattr_check_freemap(ds->sc, usedmap, &leafhdr))
|
|
xchk_da_set_corrupt(ds, level);
|
|
|
|
if (leafhdr.usedbytes != usedbytes)
|
|
xchk_da_set_corrupt(ds, level);
|
|
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
/* Scrub a attribute btree record. */
|
|
STATIC int
|
|
xchk_xattr_rec(
|
|
struct xchk_da_btree *ds,
|
|
int level)
|
|
{
|
|
struct xfs_mount *mp = ds->state->mp;
|
|
struct xfs_da_state_blk *blk = &ds->state->path.blk[level];
|
|
struct xfs_attr_leaf_name_local *lentry;
|
|
struct xfs_attr_leaf_name_remote *rentry;
|
|
struct xfs_buf *bp;
|
|
struct xfs_attr_leaf_entry *ent;
|
|
xfs_dahash_t calc_hash;
|
|
xfs_dahash_t hash;
|
|
int nameidx;
|
|
int hdrsize;
|
|
unsigned int badflags;
|
|
int error;
|
|
|
|
ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
|
|
|
|
ent = xfs_attr3_leaf_entryp(blk->bp->b_addr) + blk->index;
|
|
|
|
/* Check the whole block, if necessary. */
|
|
error = xchk_xattr_block(ds, level);
|
|
if (error)
|
|
goto out;
|
|
if (ds->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
|
|
goto out;
|
|
|
|
/* Check the hash of the entry. */
|
|
error = xchk_da_btree_hash(ds, level, &ent->hashval);
|
|
if (error)
|
|
goto out;
|
|
|
|
/* Find the attr entry's location. */
|
|
bp = blk->bp;
|
|
hdrsize = xfs_attr3_leaf_hdr_size(bp->b_addr);
|
|
nameidx = be16_to_cpu(ent->nameidx);
|
|
if (nameidx < hdrsize || nameidx >= mp->m_attr_geo->blksize) {
|
|
xchk_da_set_corrupt(ds, level);
|
|
goto out;
|
|
}
|
|
|
|
/* Retrieve the entry and check it. */
|
|
hash = be32_to_cpu(ent->hashval);
|
|
badflags = ~(XFS_ATTR_LOCAL | XFS_ATTR_ROOT | XFS_ATTR_SECURE |
|
|
XFS_ATTR_INCOMPLETE);
|
|
if ((ent->flags & badflags) != 0)
|
|
xchk_da_set_corrupt(ds, level);
|
|
if (ent->flags & XFS_ATTR_LOCAL) {
|
|
lentry = (struct xfs_attr_leaf_name_local *)
|
|
(((char *)bp->b_addr) + nameidx);
|
|
if (lentry->namelen <= 0) {
|
|
xchk_da_set_corrupt(ds, level);
|
|
goto out;
|
|
}
|
|
calc_hash = xfs_da_hashname(lentry->nameval, lentry->namelen);
|
|
} else {
|
|
rentry = (struct xfs_attr_leaf_name_remote *)
|
|
(((char *)bp->b_addr) + nameidx);
|
|
if (rentry->namelen <= 0) {
|
|
xchk_da_set_corrupt(ds, level);
|
|
goto out;
|
|
}
|
|
calc_hash = xfs_da_hashname(rentry->name, rentry->namelen);
|
|
}
|
|
if (calc_hash != hash)
|
|
xchk_da_set_corrupt(ds, level);
|
|
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
/* Scrub the extended attribute metadata. */
|
|
int
|
|
xchk_xattr(
|
|
struct xfs_scrub *sc)
|
|
{
|
|
struct xchk_xattr sx;
|
|
xfs_dablk_t last_checked = -1U;
|
|
int error = 0;
|
|
|
|
if (!xfs_inode_hasattr(sc->ip))
|
|
return -ENOENT;
|
|
|
|
memset(&sx, 0, sizeof(sx));
|
|
/* Check attribute tree structure */
|
|
error = xchk_da_btree(sc, XFS_ATTR_FORK, xchk_xattr_rec,
|
|
&last_checked);
|
|
if (error)
|
|
goto out;
|
|
|
|
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
|
|
goto out;
|
|
|
|
/* Check that every attr key can also be looked up by hash. */
|
|
sx.context.dp = sc->ip;
|
|
sx.context.resynch = 1;
|
|
sx.context.put_listent = xchk_xattr_listent;
|
|
sx.context.tp = sc->tp;
|
|
sx.context.allow_incomplete = true;
|
|
sx.sc = sc;
|
|
|
|
/*
|
|
* Look up every xattr in this file by name.
|
|
*
|
|
* Use the backend implementation of xfs_attr_list to call
|
|
* xchk_xattr_listent on every attribute key in this inode.
|
|
* In other words, we use the same iterator/callback mechanism
|
|
* that listattr uses to scrub extended attributes, though in our
|
|
* _listent function, we check the value of the attribute.
|
|
*
|
|
* The VFS only locks i_rwsem when modifying attrs, so keep all
|
|
* three locks held because that's the only way to ensure we're
|
|
* the only thread poking into the da btree. We traverse the da
|
|
* btree while holding a leaf buffer locked for the xattr name
|
|
* iteration, which doesn't really follow the usual buffer
|
|
* locking order.
|
|
*/
|
|
error = xfs_attr_list_ilocked(&sx.context);
|
|
if (!xchk_fblock_process_error(sc, XFS_ATTR_FORK, 0, &error))
|
|
goto out;
|
|
|
|
/* Did our listent function try to return any errors? */
|
|
if (sx.context.seen_enough < 0)
|
|
error = sx.context.seen_enough;
|
|
out:
|
|
return error;
|
|
}
|