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Subject[PATCH 07/10] nfs: honor AT_STATX_DONT_SYNC
Date
The description of this flag says "Don't sync attributes with the server".
In other words: always use the attributes cached in the kernel and don't
send network or local messages to refresh the attributes.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Cc: Trond Myklebust <trond.myklebust@primarydata.com>
Cc: Anna Schumaker <anna.schumaker@netapp.com>
---
fs/nfs/inode.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 134d9f560240..487e99ba7d33 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -739,6 +739,10 @@ int nfs_getattr(const struct path *path, struct kstat *stat,
int err = 0;

trace_nfs_getattr_enter(inode);
+
+ if (query_flags & AT_STATX_DONT_SYNC)
+ goto out;
+
/* Flush out writes to the server in order to update c/mtime. */
if (S_ISREG(inode->i_mode)) {
err = filemap_write_and_wait(inode->i_mapping);
@@ -769,13 +773,13 @@ int nfs_getattr(const struct path *path, struct kstat *stat,
err = __nfs_revalidate_inode(server, inode);
} else
nfs_readdirplus_parent_cache_hit(path->dentry);
+out:
if (!err) {
generic_fillattr(inode, stat);
stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
if (S_ISDIR(inode->i_mode))
stat->blksize = NFS_SERVER(inode)->dtsize;
}
-out:
trace_nfs_getattr_exit(inode, err);
return err;
}
--
2.5.5
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