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fscrypt: stop using PG_error to track error status

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As a step towards freeing the PG_error flag for other uses, change ext4
and f2fs to stop using PG_error to track decryption errors.  Instead, if
a decryption error occurs, just mark the whole bio as failed.  The
coarser granularity isn't really a problem since it isn't any worse than
what the block layer provides, and errors from a multi-page readahead
aren't reported to applications unless a single-page read fails too.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Chao Yu <chao@kernel.org> # for f2fs part
Link: https://lore.kernel.org/r/20220815235052.86545-2-ebiggers@kernel.org
This commit is contained in:
Eric Biggers 2022-08-15 16:50:51 -07:00
parent 272ac15003
commit 14db0b3c7b
4 changed files with 29 additions and 20 deletions
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5
include/linux/fscrypt.h
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@ -351,7 +351,7 @@ u64 fscrypt_fname_siphash(const struct inode *dir, const struct qstr *name);
int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags);
/* bio.c */
void fscrypt_decrypt_bio(struct bio *bio);
bool fscrypt_decrypt_bio(struct bio *bio);
int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk,
sector_t pblk, unsigned int len);
@ -644,8 +644,9 @@ static inline int fscrypt_d_revalidate(struct dentry *dentry,
}
/* bio.c */
static inline void fscrypt_decrypt_bio(struct bio *bio)
static inline bool fscrypt_decrypt_bio(struct bio *bio)
{
return true;
}
static inline int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk,