diff mbox

[4/6] xstat: NFS: Return extended attributes

Message ID 20120419140653.17272.95035.stgit@warthog.procyon.org.uk
State Not Applicable, archived
Headers show

Commit Message

David Howells April 19, 2012, 2:06 p.m. UTC 
Return extended attributes from the NFS filesystem.  This includes the
following:

 (1) The change attribute as st_data_version if NFSv4.

 (2) XSTAT_INFO_AUTOMOUNT and XSTAT_INFO_FABRICATED are set on referral or
     submount directories that are automounted upon.  NFS shows one directory
     with a different FSID, but the local filesystem has two: the mountpoint
     directory and the root of the filesystem mounted upon it.

 (3) XSTAT_INFO_REMOTE is set on files acquired over NFS.

Furthermore, what nfs_getattr() does can be controlled as follows:

 (1) If AT_FORCE_ATTR_SYNC is indicated, or mtime, ctime or data_version (NFSv4
     only) are requested then the outstanding writes will be written to the
     server first.

 (2) The inode's attributes may be synchronised with the server:

     (a) If AT_FORCE_ATTR_SYNC is indicated or if atime is requested (and atime
     	 updating is not suppressed by a mount flag) then the attributes will
     	 be reread unconditionally.

     (b) If the data version or any of basic stats are requested then the
     	 attributes will be reread if the cached attributes have expired.

     (c) Otherwise the cached attributes will be used - even if expired -
     	 without reference to the server.

Signed-off-by: David Howells <dhowells@redhat.com>
---

 fs/nfs/inode.c |   49 +++++++++++++++++++++++++++++++++++++------------
 fs/nfs/super.c |    1 +
 2 files changed, 38 insertions(+), 12 deletions(-)


--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Comments

Trond Myklebust April 19, 2012, 2:35 p.m. UTC | #1 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--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
David Howells April 26, 2012, 1:52 p.m. UTC | #2 
Myklebust, Trond <Trond.Myklebust@netapp.com> wrote:

> Hmm... As far as I can see you are still doing an nfs_revalidate_inode()
> in the non-forced case. That will cause expired attributes to be
> retrieved from the server.

Revalidation is only done when you force it or explicitly ask for a basic stat
or the data version number:

-	if (need_atime)
-		err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
-	else
-		err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
-	if (!err) {
-		generic_fillattr(inode, stat);
-		stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
+	if (force || stat->request_mask & (XSTAT_BASIC_STATS | XSTAT_VERSION)) {
+		if (force || need_atime)
+			err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
+		else
+			err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
+		if (err)
+			goto out;

Unfortunately, I think I have to revalidate if any of XSTAT_BASIC_STATS are
requested to maintain compatibility with stat() so that stat() can be done
with xstat().  On the other hand, stat() could be done by userspace with
xstat() and AT_FORCE_ATTR_SYNC, I suppose.

David
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index e8bbfa5..460fcf3 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -509,11 +509,18 @@  void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 {
 	struct inode *inode = dentry->d_inode;
+	unsigned force = stat->query_flags & AT_FORCE_ATTR_SYNC;
 	int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
 	int err;
 
-	/* Flush out writes to the server in order to update c/mtime.  */
-	if (S_ISREG(inode->i_mode)) {
+	if (NFS_SERVER(inode)->nfs_client->rpc_ops->version < 4)
+		stat->request_mask &= ~XSTAT_VERSION;
+
+	/* Flush out writes to the server in order to update c/mtime
+	 * or data version if the user wants them */
+	if ((force || (stat->request_mask &
+		       (XSTAT_MTIME | XSTAT_CTIME | XSTAT_VERSION))) &&
+	    S_ISREG(inode->i_mode)) {
 		err = filemap_write_and_wait(inode->i_mapping);
 		if (err)
 			goto out;
@@ -528,18 +535,36 @@  int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 	 *  - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
 	 *    no point in checking those.
 	 */
- 	if ((mnt->mnt_flags & MNT_NOATIME) ||
- 	    ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
+	if (mnt->mnt_flags & MNT_NOATIME ||
+	    (mnt->mnt_flags & MNT_NODIRATIME && S_ISDIR(inode->i_mode))) {
+		stat->ioc_flags |= FS_NOATIME_FL;
+		need_atime = 0;
+	} else if (!(stat->request_mask & XSTAT_ATIME)) {
 		need_atime = 0;
+	}
 
-	if (need_atime)
-		err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
-	else
-		err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
-	if (!err) {
-		generic_fillattr(inode, stat);
-		stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
+	if (force || stat->request_mask & (XSTAT_BASIC_STATS | XSTAT_VERSION)) {
+		if (force || need_atime)
+			err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
+		else
+			err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
+		if (err)
+			goto out;
 	}
+
+	generic_fillattr(inode, stat);
+	stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
+
+	if (stat->request_mask & XSTAT_VERSION) {
+		stat->version = inode->i_version;
+		stat->result_mask |= XSTAT_VERSION;
+	}
+
+	if (IS_AUTOMOUNT(inode))
+		stat->information |= XSTAT_INFO_FABRICATED;
+
+	stat->information |= XSTAT_INFO_REMOTE;
+
 out:
 	return err;
 }
@@ -852,7 +877,7 @@  int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
-	
+
 	if (mapping->nrpages != 0) {
 		int ret = invalidate_inode_pages2(mapping);
 		if (ret < 0)
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 37412f7..faa652c 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2222,6 +2222,7 @@  static int nfs_set_super(struct super_block *s, void *data)
 	ret = set_anon_super(s, server);
 	if (ret == 0)
 		server->s_dev = s->s_dev;
+	memcpy(&s->s_volume_id, &server->fsid, sizeof(s->s_volume_id));
 	return ret;
 }