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 <[email protected]> Cc: Trond Myklebust <[email protected]> Cc: Anna Schumaker <[email protected]> --- 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
