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ext4: fix fast commit alignment issues

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Fast commit recovery data on disk may not be aligned. So, when the
recovery code reads it, this patch makes sure that fast commit info
found on-disk is first memcpy-ed into an aligned variable before
accessing it. As a consequence of it, we also remove some macros that
could resulted in unaligned accesses.

Cc: stable@kernel.org
Fixes: 8016e29f43 ("ext4: fast commit recovery path")
Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20210519215920.2037527-1-harshads@google.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Harshad Shirwadkar
2021-05-19 14:59:20 -07:00
committed by Theodore Ts'o
parent 082cd4ec24
commit a7ba36bc94
2 changed files with 90 additions and 99 deletions
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19
fs/ext4/fast_commit.h
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@@ -153,13 +153,6 @@ struct ext4_fc_replay_state {
#define region_last(__region) (((__region)->lblk) + ((__region)->len) - 1)
#endif
#define fc_for_each_tl(__start, __end, __tl) \
for (tl = (struct ext4_fc_tl *)(__start); \
(__u8 *)tl < (__u8 *)(__end); \
tl = (struct ext4_fc_tl *)((__u8 *)tl + \
sizeof(struct ext4_fc_tl) + \
+ le16_to_cpu(tl->fc_len)))
static inline const char *tag2str(__u16 tag)
{
switch (tag) {
@@ -186,16 +179,4 @@ static inline const char *tag2str(__u16 tag)
}
}
/* Get length of a particular tlv */
static inline int ext4_fc_tag_len(struct ext4_fc_tl *tl)
{
return le16_to_cpu(tl->fc_len);
}
/* Get a pointer to "value" of a tlv */
static inline __u8 *ext4_fc_tag_val(struct ext4_fc_tl *tl)
{
return (__u8 *)tl + sizeof(*tl);
}
#endif /* __FAST_COMMIT_H__ */