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erofs: support STATX_DIOALIGN

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

[Before]
```
./statx_test /mnt/erofs/testfile
statx(/mnt/erofs/testfile) = 0
dio mem align:0
dio offset align:0
```

[After]
```
./statx_test /mnt/erofs/testfile
statx(/mnt/erofs/testfile) = 0
dio mem align:512
dio offset align:512
```

Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240718083243.2485437-1-hsiangkao@linux.alibaba.com
This commit is contained in:
Hongbo Li 2024-07-18 16:32:43 +08:00 committed by Gao Xiang
parent a3c10bed33
commit 9c421ef3f6
1 changed files with 17 additions and 2 deletions
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19
fs/erofs/inode.c
View file

@ -334,14 +334,29 @@ int erofs_getattr(struct mnt_idmap *idmap, const struct path *path,
unsigned int query_flags)
{
struct inode *const inode = d_inode(path->dentry);
bool compressed =
erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout);
if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout))
if (compressed)
stat->attributes |= STATX_ATTR_COMPRESSED;
stat->attributes |= STATX_ATTR_IMMUTABLE;
stat->attributes_mask |= (STATX_ATTR_COMPRESSED |
STATX_ATTR_IMMUTABLE);
/*
* Return the DIO alignment restrictions if requested.
*
* In EROFS, STATX_DIOALIGN is not supported in ondemand mode and
* compressed files, so in these cases we report no DIO support.
*/
if ((request_mask & STATX_DIOALIGN) && S_ISREG(inode->i_mode)) {
stat->result_mask |= STATX_DIOALIGN;
if (!erofs_is_fscache_mode(inode->i_sb) && !compressed) {
stat->dio_mem_align =
bdev_logical_block_size(inode->i_sb->s_bdev);
stat->dio_offset_align = stat->dio_mem_align;
}
}
generic_fillattr(idmap, request_mask, inode, stat);
return 0;
}