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authorHongbo Li <lihongbo22@huawei.com>2024-07-18 10:32:43 +0200
committerGao Xiang <hsiangkao@linux.alibaba.com>2024-07-26 12:47:22 +0200
commit9c421ef3f6b30ab912eaaa3c3d20cfb921fd8c8f (patch)
tree1c66f4dabb015eff22bf112f132085340b7c9abe /fs
parenterofs: silence uninitialized variable warning in z_erofs_scan_folio() (diff)
downloadlinux-9c421ef3f6b30ab912eaaa3c3d20cfb921fd8c8f.tar.xz
linux-9c421ef3f6b30ab912eaaa3c3d20cfb921fd8c8f.zip
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
Diffstat (limited to 'fs')
-rw-r--r--fs/erofs/inode.c19
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;
}