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authorEric Biggers <ebiggers@google.com>2022-08-27 08:58:45 +0200
committerEric Biggers <ebiggers@google.com>2022-09-12 02:47:12 +0200
commit2d985f8c6b91b5007a16e640bb9c038c5fb2839b (patch)
tree0fc609386fbba4cabc8c4c0a99005cc7cb53807d /fs/stat.c
parentstatx: add direct I/O alignment information (diff)
downloadlinux-2d985f8c6b91b5007a16e640bb9c038c5fb2839b.tar.xz
linux-2d985f8c6b91b5007a16e640bb9c038c5fb2839b.zip
vfs: support STATX_DIOALIGN on block devices
Add support for STATX_DIOALIGN to block devices, so that direct I/O alignment restrictions are exposed to userspace in a generic way. Note that this breaks the tradition of stat operating only on the block device node, not the block device itself. However, it was felt that doing this is preferable, in order to make the interface useful and avoid needing separate interfaces for regular files and block devices. Signed-off-by: Eric Biggers <ebiggers@google.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org> Link: https://lore.kernel.org/r/20220827065851.135710-3-ebiggers@kernel.org
Diffstat (limited to 'fs/stat.c')
-rw-r--r--fs/stat.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/stat.c b/fs/stat.c
index a7930d744483..ef50573c72a2 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -5,6 +5,7 @@
* Copyright (C) 1991, 1992 Linus Torvalds
*/
+#include <linux/blkdev.h>
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/errno.h>
@@ -230,11 +231,22 @@ retry:
goto out;
error = vfs_getattr(&path, stat, request_mask, flags);
+
stat->mnt_id = real_mount(path.mnt)->mnt_id;
stat->result_mask |= STATX_MNT_ID;
+
if (path.mnt->mnt_root == path.dentry)
stat->attributes |= STATX_ATTR_MOUNT_ROOT;
stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT;
+
+ /* Handle STATX_DIOALIGN for block devices. */
+ if (request_mask & STATX_DIOALIGN) {
+ struct inode *inode = d_backing_inode(path.dentry);
+
+ if (S_ISBLK(inode->i_mode))
+ bdev_statx_dioalign(inode, stat);
+ }
+
path_put(&path);
if (retry_estale(error, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;