The commit is pushed to "branch-rh7-3.10.0-1160.62.1.vz7.187.x-ovz" and will
appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-1160.62.1.vz7.187.5
------>
commit 95b93077b2c7f751466fb0a5f2732b1fa426d29c
Author: Zhang Yi <yi.zh...@huawei.com>
Date: Tue Jun 14 17:53:31 2022 +0300
ms/ext4: check for inconsistent extents between index and leaf block
Now that we can check out overlapping extents in leaf block and
out-of-order index extents in index block. But the .ee_block in the
first extent of one leaf block should equal to the .ei_block in it's
parent index extent entry. This patch add a check to verify such
inconsistent between the index and leaf block.
Signed-off-by: Zhang Yi <yi.zh...@huawei.com>
Link: https://lore.kernel.org/r/20210908120850.4012324-3-yi.zh...@huawei.com
Signed-off-by: Theodore Ts'o <ty...@mit.edu>
(cherry-picked from ms commit 9c6e071913792d80894cd0be98cc3c4b770e26d3)
https://jira.sw.ru/browse/PSBM-139452
Signed-off-by: Pavel Tikhomirov <ptikhomi...@virtuozzo.com>
---
fs/ext4/extents.c | 58 +++++++++++++++++++++++++++++++++----------------------
1 file changed, 35 insertions(+), 23 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 76a2f153fb72..0b6ed085f3d9 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -397,7 +397,7 @@ static int ext4_valid_extent_idx(struct inode *inode,
static int ext4_valid_extent_entries(struct inode *inode,
struct ext4_extent_header *eh,
- int depth)
+ ext4_lblk_t lblk, int depth)
{
struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
unsigned short entries;
@@ -413,6 +413,14 @@ static int ext4_valid_extent_entries(struct inode *inode,
if (depth == 0) {
/* leaf entries */
struct ext4_extent *ext = EXT_FIRST_EXTENT(eh);
+
+ /*
+ * The logical block in the first entry should equal to
+ * the number in the index block.
+ */
+ if (depth != ext_depth(inode) &&
+ lblk != le32_to_cpu(ext->ee_block))
+ return 0;
while (entries) {
if (!ext4_valid_extent(inode, ext))
return 0;
@@ -430,6 +438,14 @@ static int ext4_valid_extent_entries(struct inode *inode,
}
} else {
struct ext4_extent_idx *ext_idx = EXT_FIRST_INDEX(eh);
+
+ /*
+ * The logical block in the first entry should equal to
+ * the number in the parent index block.
+ */
+ if (depth != ext_depth(inode) &&
+ lblk != le32_to_cpu(ext_idx->ei_block))
+ return 0;
while (entries) {
if (!ext4_valid_extent_idx(inode, ext_idx))
return 0;
@@ -451,7 +467,7 @@ static int ext4_valid_extent_entries(struct inode *inode,
static int __ext4_ext_check(const char *function, unsigned int line,
struct inode *inode, struct ext4_extent_header *eh,
- int depth, ext4_fsblk_t pblk)
+ int depth, ext4_fsblk_t pblk, ext4_lblk_t lblk)
{
const char *error_msg;
int max = 0;
@@ -477,7 +493,7 @@ static int __ext4_ext_check(const char *function, unsigned
int line,
error_msg = "invalid eh_entries";
goto corrupted;
}
- if (!ext4_valid_extent_entries(inode, eh, depth)) {
+ if (!ext4_valid_extent_entries(inode, eh, lblk, depth)) {
error_msg = "invalid extent entries";
goto corrupted;
}
@@ -501,7 +517,7 @@ static int __ext4_ext_check(const char *function, unsigned
int line,
}
#define ext4_ext_check(inode, eh, depth, pblk) \
- __ext4_ext_check(__func__, __LINE__, (inode), (eh), (depth), (pblk))
+ __ext4_ext_check(__func__, __LINE__, (inode), (eh), (depth), (pblk), 0)
int ext4_ext_check_inode(struct inode *inode)
{
@@ -510,12 +526,14 @@ int ext4_ext_check_inode(struct inode *inode)
static struct buffer_head *
__read_extent_tree_block(const char *function, unsigned int line,
- struct inode *inode, ext4_fsblk_t pblk, int depth,
- int flags)
+ struct inode *inode, struct ext4_extent_idx *idx,
+ int depth, int flags)
{
struct buffer_head *bh;
int err;
+ ext4_fsblk_t pblk;
+ pblk = ext4_idx_pblock(idx);
bh = sb_getblk(inode->i_sb, pblk);
if (unlikely(!bh))
return ERR_PTR(-ENOMEM);
@@ -528,8 +546,8 @@ __read_extent_tree_block(const char *function, unsigned int
line,
}
if (buffer_verified(bh) && !(flags & EXT4_EX_FORCE_CACHE))
return bh;
- err = __ext4_ext_check(function, line, inode,
- ext_block_hdr(bh), depth, pblk);
+ err = __ext4_ext_check(function, line, inode, ext_block_hdr(bh),
+ depth, pblk, le32_to_cpu(idx->ei_block));
if (err)
goto errout;
set_buffer_verified(bh);
@@ -566,8 +584,8 @@ __read_extent_tree_block(const char *function, unsigned int
line,
}
-#define read_extent_tree_block(inode, pblk, depth, flags) \
- __read_extent_tree_block(__func__, __LINE__, (inode), (pblk), \
+#define read_extent_tree_block(inode, idx, depth, flags) \
+ __read_extent_tree_block(__func__, __LINE__, (inode), (idx), \
(depth), (flags))
/*
@@ -614,8 +632,7 @@ int ext4_ext_precache(struct inode *inode)
i--;
continue;
}
- bh = read_extent_tree_block(inode,
- ext4_idx_pblock(path[i].p_idx++),
+ bh = read_extent_tree_block(inode, path[i].p_idx++,
depth - i - 1,
EXT4_EX_FORCE_CACHE);
if (IS_ERR(bh)) {
@@ -907,8 +924,7 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
path[ppos].p_depth = i;
path[ppos].p_ext = NULL;
- bh = read_extent_tree_block(inode, path[ppos].p_block, --i,
- flags);
+ bh = read_extent_tree_block(inode, path[ppos].p_idx, --i,
flags);
if (IS_ERR(bh)) {
ret = PTR_ERR(bh);
goto err;
@@ -1504,7 +1520,6 @@ static int ext4_ext_search_right(struct inode *inode,
struct ext4_extent_header *eh;
struct ext4_extent_idx *ix;
struct ext4_extent *ex;
- ext4_fsblk_t block;
int depth; /* Note, NOT eh_depth; depth from top of tree */
int ee_len;
@@ -1571,20 +1586,17 @@ static int ext4_ext_search_right(struct inode *inode,
* follow it and find the closest allocated
* block to the right */
ix++;
- block = ext4_idx_pblock(ix);
while (++depth < path->p_depth) {
/* subtract from p_depth to get proper eh_depth */
- bh = read_extent_tree_block(inode, block,
- path->p_depth - depth, 0);
+ bh = read_extent_tree_block(inode, ix, path->p_depth - depth,
0);
if (IS_ERR(bh))
return PTR_ERR(bh);
eh = ext_block_hdr(bh);
ix = EXT_FIRST_INDEX(eh);
- block = ext4_idx_pblock(ix);
put_bh(bh);
}
- bh = read_extent_tree_block(inode, block, path->p_depth - depth, 0);
+ bh = read_extent_tree_block(inode, ix, path->p_depth - depth, 0);
if (IS_ERR(bh))
return PTR_ERR(bh);
eh = ext_block_hdr(bh);
@@ -3002,9 +3014,9 @@ int ext4_ext_remove_space(struct inode *inode,
ext4_lblk_t start,
ext_debug("move to level %d (block %llu)\n",
i + 1, ext4_idx_pblock(path[i].p_idx));
memset(path + i + 1, 0, sizeof(*path));
- bh = read_extent_tree_block(inode,
- ext4_idx_pblock(path[i].p_idx), depth - i - 1,
- EXT4_EX_NOCACHE);
+ bh = read_extent_tree_block(inode, path[i].p_idx,
+ depth - i - 1,
+ EXT4_EX_NOCACHE);
if (IS_ERR(bh)) {
/* should we reset i_size? */
err = PTR_ERR(bh);
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