diff options
| author | Hongbo Li <lihongbo22@huawei.com> | 2024-07-18 16:32:43 +0800 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2024-07-26 18:47:22 +0800 |
| commit | 9c421ef3f6b30ab912eaaa3c3d20cfb921fd8c8f (patch) | |
| tree | 1c66f4dabb015eff22bf112f132085340b7c9abe | |
| parent | a3c10bed330b7ab401254a0c91098a03b04f1448 (diff) | |
erofs: support STATX_DIOALIGN
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
| -rw-r--r-- | fs/erofs/inode.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c index 5f6439a63af7..43c09aae2afc 100644 --- a/fs/erofs/inode.c +++ b/fs/erofs/inode.c @@ -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; } |