[PATCH v7 5/9] ceph: report the inode version in getattr if requested

Jeff Layton
2022-10-17T10:58:47Z

When getattr requests the STX_VERSION, request the full gamut of caps
(similarly to how ctime is handled). When the change attribute seems to
be valid, return it in the ino_version field and set the flag in the
reply mask. Also, unconditionally enable STATX_ATTR_VERSION_MONOTONIC.

Reviewed-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
fs/ceph/inode.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 42351d7a0dd6..bcab855bf1ae 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -2415,10 +2415,10 @@ static int statx_to_caps(u32 want, umode_t mode)
{
int mask = 0;

- if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
+ if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME|STATX_VERSION))
mask |= CEPH_CAP_AUTH_SHARED;

- if (want & (STATX_NLINK|STATX_CTIME)) {
+ if (want & (STATX_NLINK|STATX_CTIME|STATX_VERSION)) {
/*
* The link count for directories depends on inode->i_subdirs,
* and that is only updated when Fs caps are held.
@@ -2429,11 +2429,10 @@ static int statx_to_caps(u32 want, umode_t mode)
mask |= CEPH_CAP_LINK_SHARED;
}

- if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
- STATX_BLOCKS))
+ if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|STATX_BLOCKS|STATX_VERSION))
mask |= CEPH_CAP_FILE_SHARED;

- if (want & (STATX_CTIME))
+ if (want & (STATX_CTIME|STATX_VERSION))
mask |= CEPH_CAP_XATTR_SHARED;

return mask;
@@ -2475,6 +2474,11 @@ int ceph_getattr(struct user_namespace *mnt_userns, const struct path *path,
valid_mask |= STATX_BTIME;
}

+ if (request_mask & STATX_VERSION) {
+ stat->version = inode_peek_iversion_raw(inode);
+ valid_mask |= STATX_VERSION;
+ }
+
if (ceph_snap(inode) == CEPH_NOSNAP)
stat->dev = inode->i_sb->s_dev;
else
@@ -2498,6 +2502,8 @@ int ceph_getattr(struct user_namespace *mnt_userns, const struct path *path,
stat->nlink = 1 + 1 + ci->i_subdirs;
}

+ stat->attributes_mask |= STATX_ATTR_VERSION_MONOTONIC;
+ stat->attributes |= STATX_ATTR_VERSION_MONOTONIC;
stat->result_mask = request_mask & valid_mask;
return err;
}
--
2.37.3