From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Since __xfs_dir3_data_check verifies on-disk metadata, we can't have it
noisily blowing asserts and hanging the system on corrupt data coming in
off the disk. Instead, have it return a boolean like all the other
checker functions, and only have it noisily fail if we fail in debug
mode.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/libxfs/xfs_dir2_block.c | 4 --
fs/xfs/libxfs/xfs_dir2_data.c | 100 +++++++++++++++++++++-------------------
fs/xfs/libxfs/xfs_dir2_priv.h | 10 +++-
3 files changed, 61 insertions(+), 53 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_dir2_block.c b/fs/xfs/libxfs/xfs_dir2_block.c
index 43c902f..e427249 100644
--- a/fs/xfs/libxfs/xfs_dir2_block.c
+++ b/fs/xfs/libxfs/xfs_dir2_block.c
@@ -78,9 +78,7 @@ xfs_dir3_block_verify(
if (hdr3->magic != cpu_to_be32(XFS_DIR2_BLOCK_MAGIC))
return false;
}
- if (__xfs_dir3_data_check(NULL, bp))
- return false;
- return true;
+ return __xfs_dir3_data_check(NULL, bp);
}
static void
diff --git a/fs/xfs/libxfs/xfs_dir2_data.c b/fs/xfs/libxfs/xfs_dir2_data.c
index 8727a43..af15f705 100644
--- a/fs/xfs/libxfs/xfs_dir2_data.c
+++ b/fs/xfs/libxfs/xfs_dir2_data.c
@@ -36,9 +36,9 @@
/*
* Check the consistency of the data block.
* The input can also be a block-format directory.
- * Return 0 is the buffer is good, otherwise an error.
+ * Return true if the buffer is good.
*/
-int
+bool
__xfs_dir3_data_check(
struct xfs_inode *dp, /* incore inode pointer */
struct xfs_buf *bp) /* data block's buffer */
@@ -90,16 +90,16 @@ __xfs_dir3_data_check(
* so just ensure that the count falls somewhere inside the
* block right now.
*/
- XFS_WANT_CORRUPTED_RETURN(mp, be32_to_cpu(btp->count) <
- ((char *)btp - p) / sizeof(struct xfs_dir2_leaf_entry));
+ if (be32_to_cpu(btp->count) >=
+ ((char *)btp - p) / sizeof(struct xfs_dir2_leaf_entry))
+ return false;
break;
case cpu_to_be32(XFS_DIR3_DATA_MAGIC):
case cpu_to_be32(XFS_DIR2_DATA_MAGIC):
endp = (char *)hdr + geo->blksize;
break;
default:
- XFS_ERROR_REPORT("Bad Magic", XFS_ERRLEVEL_LOW, mp);
- return -EFSCORRUPTED;
+ return false;
}
/*
@@ -108,22 +108,25 @@ __xfs_dir3_data_check(
bf = ops->data_bestfree_p(hdr);
count = lastfree = freeseen = 0;
if (!bf[0].length) {
- XFS_WANT_CORRUPTED_RETURN(mp, !bf[0].offset);
+ if (bf[0].offset)
+ return false;
freeseen |= 1 << 0;
}
if (!bf[1].length) {
- XFS_WANT_CORRUPTED_RETURN(mp, !bf[1].offset);
+ if (bf[1].offset)
+ return false;
freeseen |= 1 << 1;
}
if (!bf[2].length) {
- XFS_WANT_CORRUPTED_RETURN(mp, !bf[2].offset);
+ if (bf[2].offset)
+ return false;
freeseen |= 1 << 2;
}
- XFS_WANT_CORRUPTED_RETURN(mp, be16_to_cpu(bf[0].length) >=
- be16_to_cpu(bf[1].length));
- XFS_WANT_CORRUPTED_RETURN(mp, be16_to_cpu(bf[1].length) >=
- be16_to_cpu(bf[2].length));
+ if (be16_to_cpu(bf[0].length) < be16_to_cpu(bf[1].length))
+ return false;
+ if (be16_to_cpu(bf[1].length) < be16_to_cpu(bf[2].length))
+ return false;
/*
* Loop over the data/unused entries.
*/
@@ -135,22 +138,23 @@ __xfs_dir3_data_check(
* doesn't need to be there.
*/
if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
- XFS_WANT_CORRUPTED_RETURN(mp, lastfree == 0);
- XFS_WANT_CORRUPTED_RETURN(mp, endp >=
- p + be16_to_cpu(dup->length));
- XFS_WANT_CORRUPTED_RETURN(mp,
- be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)) ==
- (char *)dup - (char *)hdr);
+ if (lastfree != 0)
+ return false;
+ if (endp < p + be16_to_cpu(dup->length))
+ return false;
+ if (be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)) !=
+ (char *)dup - (char *)hdr)
+ return false;
dfp = xfs_dir2_data_freefind(hdr, bf, dup);
if (dfp) {
i = (int)(dfp - bf);
- XFS_WANT_CORRUPTED_RETURN(mp,
- (freeseen & (1 << i)) == 0);
+ if ((freeseen & (1 << i)) != 0)
+ return false;
freeseen |= 1 << i;
} else {
- XFS_WANT_CORRUPTED_RETURN(mp,
- be16_to_cpu(dup->length) <=
- be16_to_cpu(bf[2].length));
+ if (be16_to_cpu(dup->length) >
+ be16_to_cpu(bf[2].length))
+ return false;
}
p += be16_to_cpu(dup->length);
lastfree = 1;
@@ -163,16 +167,17 @@ __xfs_dir3_data_check(
* The linear search is crude but this is DEBUG code.
*/
dep = (xfs_dir2_data_entry_t *)p;
- XFS_WANT_CORRUPTED_RETURN(mp, dep->namelen != 0);
- XFS_WANT_CORRUPTED_RETURN(mp,
- !xfs_dir_ino_validate(mp, be64_to_cpu(dep->inumber)));
- XFS_WANT_CORRUPTED_RETURN(mp, endp >=
- p + ops->data_entsize(dep->namelen));
- XFS_WANT_CORRUPTED_RETURN(mp,
- be16_to_cpu(*ops->data_entry_tag_p(dep)) ==
- (char *)dep - (char *)hdr);
- XFS_WANT_CORRUPTED_RETURN(mp,
- ops->data_get_ftype(dep) < XFS_DIR3_FT_MAX);
+ if (dep->namelen == 0)
+ return false;
+ if (xfs_dir_ino_validate(mp, be64_to_cpu(dep->inumber)))
+ return false;
+ if (endp < p + ops->data_entsize(dep->namelen))
+ return false;
+ if (be16_to_cpu(*ops->data_entry_tag_p(dep)) !=
+ (char *)dep - (char *)hdr)
+ return false;
+ if (ops->data_get_ftype(dep) >= XFS_DIR3_FT_MAX)
+ return false;
count++;
lastfree = 0;
if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
@@ -188,31 +193,32 @@ __xfs_dir3_data_check(
be32_to_cpu(lep[i].hashval) == hash)
break;
}
- XFS_WANT_CORRUPTED_RETURN(mp,
- i < be32_to_cpu(btp->count));
+ if (i >= be32_to_cpu(btp->count))
+ return false;
}
p += ops->data_entsize(dep->namelen);
}
/*
* Need to have seen all the entries and all the bestfree slots.
*/
- XFS_WANT_CORRUPTED_RETURN(mp, freeseen == 7);
+ if (freeseen != 7)
+ return false;
if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) {
for (i = stale = 0; i < be32_to_cpu(btp->count); i++) {
if (lep[i].address ==
cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
stale++;
- if (i > 0)
- XFS_WANT_CORRUPTED_RETURN(mp,
- be32_to_cpu(lep[i].hashval) >=
- be32_to_cpu(lep[i - 1].hashval));
+ if (i > 0 && be32_to_cpu(lep[i].hashval) <
+ be32_to_cpu(lep[i - 1].hashval))
+ return false;
}
- XFS_WANT_CORRUPTED_RETURN(mp, count ==
- be32_to_cpu(btp->count) - be32_to_cpu(btp->stale));
- XFS_WANT_CORRUPTED_RETURN(mp, stale == be32_to_cpu(btp->stale));
+ if (count != be32_to_cpu(btp->count) - be32_to_cpu(btp->stale))
+ return false;
+ if (stale != be32_to_cpu(btp->stale))
+ return false;
}
- return 0;
+ return true;
}
static bool
@@ -235,9 +241,7 @@ xfs_dir3_data_verify(
if (hdr3->magic != cpu_to_be32(XFS_DIR2_DATA_MAGIC))
return false;
}
- if (__xfs_dir3_data_check(NULL, bp))
- return false;
- return true;
+ return __xfs_dir3_data_check(NULL, bp);
}
/*
diff --git a/fs/xfs/libxfs/xfs_dir2_priv.h b/fs/xfs/libxfs/xfs_dir2_priv.h
index 4badd26..45c68d0 100644
--- a/fs/xfs/libxfs/xfs_dir2_priv.h
+++ b/fs/xfs/libxfs/xfs_dir2_priv.h
@@ -39,12 +39,18 @@ extern int xfs_dir2_leaf_to_block(struct xfs_da_args *args,
/* xfs_dir2_data.c */
#ifdef DEBUG
-#define xfs_dir3_data_check(dp,bp) __xfs_dir3_data_check(dp, bp);
+#define xfs_dir3_data_check(dp, bp) \
+do { \
+ if (!__xfs_dir3_data_check((dp), (bp))) { \
+ XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, \
+ (bp)->b_target->bt_mount, (bp)->b_addr); \
+ } \
+} while (0)
#else
#define xfs_dir3_data_check(dp,bp)
#endif
-extern int __xfs_dir3_data_check(struct xfs_inode *dp, struct xfs_buf *bp);
+extern bool __xfs_dir3_data_check(struct xfs_inode *dp, struct xfs_buf *bp);
extern int xfs_dir3_data_read(struct xfs_trans *tp, struct xfs_inode *dp,
xfs_dablk_t bno, xfs_daddr_t mapped_bno, struct xfs_buf **bpp);
extern int xfs_dir3_data_readahead(struct xfs_inode *dp, xfs_dablk_t bno,
--
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