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* [PATCH] NFSv4.2: fix setattr caching of TIME_[MODIFY|ACCESS]_SET when timestamps are delegated
@ 2025-04-25 12:49 Sagi Grimberg
  2025-05-04  6:45 ` Sagi Grimberg
                   ` (3 more replies)
  0 siblings, 4 replies; 10+ messages in thread
From: Sagi Grimberg @ 2025-04-25 12:49 UTC (permalink / raw)
  To: linux-nfs; +Cc: Trond Myklebust, Jeff Layton, Anna Schumaker

nfs_setattr will flush all pending writes before updating a file time
attributes. However when the client holds delegated timestamps, it can
update its timestamps locally as it is the authority for the file
times attributes. The client will later set the file attributes by
adding a setattr to the delegreturn compound updating the server time
attributes.

Fix nfs_setattr to avoid flushing pending writes when the file time
attributes are delegated and the mtime/atime are set to a fixed
timestamp (ATTR_[MODIFY|ACCESS]_SET. Also, when sending the setattr
procedure over the wire, we need to clear the correct attribute bits
from the bitmask.

I was able to measure a noticable speedup when measuring untar performance.
Test: $ time tar xzf ~/dir.tgz
Baseline: 1m13.072s
Patched: 0m49.038s

Which is more than 30% latency improvement.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
---
Tested this on a vm in my laptop against chuck nfsd-testing which
grants write delegs for write-only opens, plus another small modparam
that also adds a space_limit to the delegation.

 fs/nfs/inode.c    | 49 +++++++++++++++++++++++++++++++++++++++++++----
 fs/nfs/nfs4proc.c |  8 ++++----
 2 files changed, 49 insertions(+), 8 deletions(-)

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 119e447758b9..6472b95bfd88 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -633,6 +633,34 @@ nfs_fattr_fixup_delegated(struct inode *inode, struct nfs_fattr *fattr)
 	}
 }
 
+static void nfs_set_timestamps_to_ts(struct inode *inode, struct iattr *attr)
+{
+	unsigned int cache_flags = 0;
+
+	if (attr->ia_valid & ATTR_MTIME_SET) {
+		struct timespec64 ctime = inode_get_ctime(inode);
+		struct timespec64 mtime = inode_get_mtime(inode);
+		struct timespec64 now;
+		int updated = 0;
+
+		now = inode_set_ctime_current(inode);
+		if (!timespec64_equal(&now, &ctime))
+			updated |= S_CTIME;
+
+		inode_set_mtime_to_ts(inode, attr->ia_mtime);
+		if (!timespec64_equal(&now, &mtime))
+			updated |= S_MTIME;
+
+		inode_maybe_inc_iversion(inode, updated);
+		cache_flags |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
+	}
+	if (attr->ia_valid & ATTR_ATIME_SET) {
+		inode_set_atime_to_ts(inode, attr->ia_atime);
+		cache_flags |= NFS_INO_INVALID_ATIME;
+	}
+	NFS_I(inode)->cache_validity &= ~cache_flags;
+}
+
 static void nfs_update_timestamps(struct inode *inode, unsigned int ia_valid)
 {
 	enum file_time_flags time_flags = 0;
@@ -701,14 +729,27 @@ nfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 
 	if (nfs_have_delegated_mtime(inode) && attr->ia_valid & ATTR_MTIME) {
 		spin_lock(&inode->i_lock);
-		nfs_update_timestamps(inode, attr->ia_valid);
+		if (attr->ia_valid & ATTR_MTIME_SET) {
+			nfs_set_timestamps_to_ts(inode, attr);
+			attr->ia_valid &= ~(ATTR_MTIME|ATTR_MTIME_SET|
+						ATTR_ATIME|ATTR_ATIME_SET);
+		} else {
+			nfs_update_timestamps(inode, attr->ia_valid);
+			attr->ia_valid &= ~(ATTR_MTIME|ATTR_ATIME);
+		}
 		spin_unlock(&inode->i_lock);
-		attr->ia_valid &= ~(ATTR_MTIME | ATTR_ATIME);
 	} else if (nfs_have_delegated_atime(inode) &&
 		   attr->ia_valid & ATTR_ATIME &&
 		   !(attr->ia_valid & ATTR_MTIME)) {
-		nfs_update_delegated_atime(inode);
-		attr->ia_valid &= ~ATTR_ATIME;
+		if (attr->ia_valid & ATTR_ATIME_SET) {
+			spin_lock(&inode->i_lock);
+			nfs_set_timestamps_to_ts(inode, attr);
+			spin_unlock(&inode->i_lock);
+			attr->ia_valid &= ~(ATTR_ATIME|ATTR_ATIME_SET);
+		} else {
+			nfs_update_delegated_atime(inode);
+			attr->ia_valid &= ~ATTR_ATIME;
+		}
 	}
 
 	/* Optimization: if the end result is no change, don't RPC */
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 970f28dbf253..c501a0d5da90 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -325,14 +325,14 @@ static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
 
 	if (nfs_have_delegated_mtime(inode)) {
 		if (!(cache_validity & NFS_INO_INVALID_ATIME))
-			dst[1] &= ~FATTR4_WORD1_TIME_ACCESS;
+			dst[1] &= ~(FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET);
 		if (!(cache_validity & NFS_INO_INVALID_MTIME))
-			dst[1] &= ~FATTR4_WORD1_TIME_MODIFY;
+			dst[1] &= ~(FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET);
 		if (!(cache_validity & NFS_INO_INVALID_CTIME))
-			dst[1] &= ~FATTR4_WORD1_TIME_METADATA;
+			dst[1] &= ~(FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY_SET);
 	} else if (nfs_have_delegated_atime(inode)) {
 		if (!(cache_validity & NFS_INO_INVALID_ATIME))
-			dst[1] &= ~FATTR4_WORD1_TIME_ACCESS;
+			dst[1] &= ~(FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET);
 	}
 }
 
-- 
2.43.0


^ permalink raw reply related	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2025-05-06 15:59 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-04-25 12:49 [PATCH] NFSv4.2: fix setattr caching of TIME_[MODIFY|ACCESS]_SET when timestamps are delegated Sagi Grimberg
2025-05-04  6:45 ` Sagi Grimberg
2025-05-05 13:23 ` Jeff Layton
2025-05-06 13:43   ` Sagi Grimberg
2025-05-06 13:52     ` Jeff Layton
2025-05-06 14:25       ` Sagi Grimberg
2025-05-06 14:29         ` Jeff Layton
2025-05-05 13:25 ` Chuck Lever
2025-05-06 13:45   ` Sagi Grimberg
2025-05-06 15:58 ` Trond Myklebust

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