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f2fs: support STATX_DIOALIGN

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Add support for STATX_DIOALIGN to f2fs, so that direct I/O alignment
restrictions are exposed to userspace in a generic way.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Jaegeuk Kim <jaegeuk@kernel.org>
Link: https://lore.kernel.org/r/20220827065851.135710-8-ebiggers@kernel.org
This commit is contained in:
Eric Biggers 2022-08-26 23:58:50 -07:00
parent bd36732931
commit c8c02272a9
1 changed files with 18 additions and 0 deletions
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18
fs/f2fs/file.c
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@ -847,6 +847,24 @@ int f2fs_getattr(struct user_namespace *mnt_userns, const struct path *path,
stat->btime.tv_nsec = fi->i_crtime.tv_nsec;
}
/*
* Return the DIO alignment restrictions if requested. We only return
* this information when requested, since on encrypted files it might
* take a fair bit of work to get if the file wasn't opened recently.
*
* f2fs sometimes supports DIO reads but not DIO writes. STATX_DIOALIGN
* cannot represent that, so in that case we report no DIO support.
*/
if ((request_mask & STATX_DIOALIGN) && S_ISREG(inode->i_mode)) {
unsigned int bsize = i_blocksize(inode);
stat->result_mask |= STATX_DIOALIGN;
if (!f2fs_force_buffered_io(inode, WRITE)) {
stat->dio_mem_align = bsize;
stat->dio_offset_align = bsize;
}
}
flags = fi->i_flags;
if (flags & F2FS_COMPR_FL)
stat->attributes |= STATX_ATTR_COMPRESSED;