From: Eric Sandeen <sandeen@redhat.com>
To: torvalds@linux-foundation.org,
Miklos Szeredi <mszeredi@redhat.com>,
Ira Weiny <ira.weiny@intel.com>,
David Howells <dhowells@redhat.com>
Cc: linux-fsdevel@vger.kernel.org, linux-man@vger.kernel.org,
linux-kernel@vger.kernel.org, xfs <linux-xfs@vger.kernel.org>,
linux-ext4@vger.kernel.org, Xiaoli Feng <xifeng@redhat.com>,
Eric Sandeen <sandeen@redhat.com>
Subject: [PATCH V2] uapi: fix statx attribute value overlap for DAX & MOUNT_ROOT
Date: Tue, 1 Dec 2020 17:21:40 -0600 [thread overview]
Message-ID: <3e28d2c7-fbe5-298a-13ba-dcd8fd504666@redhat.com> (raw)
[*] Note: This needs to be merged as soon as possible as it's introducing an incompatible UAPI change...
STATX_ATTR_MOUNT_ROOT and STATX_ATTR_DAX got merged with the same value,
so one of them needs fixing. Move STATX_ATTR_DAX.
While we're in here, clarify the value-matching scheme for some of the
attributes, and explain why the value for DAX does not match.
Fixes: 80340fe3605c ("statx: add mount_root")
Fixes: 712b2698e4c0 ("fs/stat: Define DAX statx attribute")
Reported-by: David Howells <dhowells@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: David Howells <dhowells@redhat.com>
---
V2: Change flag value per Darrick Wong
Tweak comment per Darrick Wong
Add Fixes: tags & reported-by & RVB per dhowells
include/uapi/linux/stat.h | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/include/uapi/linux/stat.h b/include/uapi/linux/stat.h
index 82cc58fe9368..1500a0f58041 100644
--- a/include/uapi/linux/stat.h
+++ b/include/uapi/linux/stat.h
@@ -171,9 +171,12 @@ struct statx {
* be of use to ordinary userspace programs such as GUIs or ls rather than
* specialised tools.
*
- * Note that the flags marked [I] correspond to generic FS_IOC_FLAGS
+ * Note that the flags marked [I] correspond to the FS_IOC_SETFLAGS flags
* semantically. Where possible, the numerical value is picked to correspond
- * also.
+ * also. Note that the DAX attribute indicates that the file is in the CPU
+ * direct access state. It does not correspond to the per-inode flag that
+ * some filesystems support.
+ *
*/
#define STATX_ATTR_COMPRESSED 0x00000004 /* [I] File is compressed by the fs */
#define STATX_ATTR_IMMUTABLE 0x00000010 /* [I] File is marked immutable */
@@ -183,7 +186,7 @@ struct statx {
#define STATX_ATTR_AUTOMOUNT 0x00001000 /* Dir: Automount trigger */
#define STATX_ATTR_MOUNT_ROOT 0x00002000 /* Root of a mount */
#define STATX_ATTR_VERITY 0x00100000 /* [I] Verity protected file */
-#define STATX_ATTR_DAX 0x00002000 /* [I] File is DAX */
+#define STATX_ATTR_DAX 0x00200000 /* File is currently in DAX state */
#endif /* _UAPI_LINUX_STAT_H */
--
2.17.0
next reply other threads:[~2020-12-01 23:23 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-01 23:21 Eric Sandeen [this message]
2020-12-02 4:18 ` [PATCH V2] uapi: fix statx attribute value overlap for DAX & MOUNT_ROOT Darrick J. Wong
2020-12-02 8:06 ` Christoph Hellwig
2020-12-02 16:00 ` Ira Weiny
2020-12-02 16:18 ` Miklos Szeredi
2020-12-02 16:23 ` David Howells
2020-12-02 17:41 ` Miklos Szeredi
2020-12-02 19:06 ` Greg Kroah-Hartman
2020-12-02 20:40 ` Dave Chinner
2020-12-02 21:04 ` Greg Kroah-Hartman
2020-12-03 1:50 ` Dave Chinner
2020-12-03 6:18 ` Amir Goldstein
2020-12-04 16:02 ` Theodore Y. Ts'o
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