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f2fs: allow direct read for zoned device 

This reverts dbf8e63f48 ("f2fs: remove device type check for direct IO"),
and apply the below first version, since it contributed out-of-order DIO writes.

For zoned devices, f2fs forbids direct IO and forces buffered IO
to serialize write IOs. However, the constraint does not apply to
read IOs.

Cc: stable@vger.kernel.org
Fixes: dbf8e63f48 ("f2fs: remove device type check for direct IO")
Signed-off-by: Eunhee Rho <eunhee83.rho@samsung.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2022-09-30 15:48:24 -07:00
parent 95fa90c9e5
commit 689fe57e7e
1 changed files with 6 additions and 1 deletions
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7
fs/f2fs/f2fs.h
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@ -4526,7 +4526,12 @@ static inline bool f2fs_force_buffered_io(struct inode *inode,
/* disallow direct IO if any of devices has unaligned blksize */
if (f2fs_is_multi_device(sbi) && !sbi->aligned_blksize)
return true;
/*
* for blkzoned device, fallback direct IO to buffered IO, so
* all IOs can be serialized by log-structured write.
*/
if (f2fs_sb_has_blkzoned(sbi) && (rw == WRITE))
return true;
if (f2fs_lfs_mode(sbi) && (rw == WRITE)) {
if (block_unaligned_IO(inode, iocb, iter))
return true;