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Date: Tue, 1 Dec 2020 17:21:40 -0600 From: Eric Sandeen <sandeen@...hat.com> To: torvalds@...ux-foundation.org, Miklos Szeredi <mszeredi@...hat.com>, Ira Weiny <ira.weiny@...el.com>, David Howells <dhowells@...hat.com> Cc: linux-fsdevel@...r.kernel.org, linux-man@...r.kernel.org, linux-kernel@...r.kernel.org, xfs <linux-xfs@...r.kernel.org>, linux-ext4@...r.kernel.org, Xiaoli Feng <xifeng@...hat.com>, Eric Sandeen <sandeen@...hat.com> Subject: [PATCH V2] uapi: fix statx attribute value overlap for DAX & MOUNT_ROOT [*] 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@...hat.com> Signed-off-by: Eric Sandeen <sandeen@...hat.com> Reviewed-by: David Howells <dhowells@...hat.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
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