This is a note to let you know that I've just added the patch titled
NFS: Fix attribute cache revalidation
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfs-fix-attribute-cache-revalidation.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ade14a7df796d4e86bd9d181193c883a57b13db0 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Date: Tue, 29 Dec 2015 18:55:19 -0500
Subject: NFS: Fix attribute cache revalidation
From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
commit ade14a7df796d4e86bd9d181193c883a57b13db0 upstream.
If a NFSv4 client uses the cache_consistency_bitmask in order to
request only information about the change attribute, timestamps and
size, then it has not revalidated all attributes, and hence the
attribute timeout timestamp should not be updated.
Reported-by: Donald Buczek <buczek@xxxxxxxxxxxxx>
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfs/inode.c | 54 +++++++++++++++++++++++++++++++++++++++---------------
1 file changed, 39 insertions(+), 15 deletions(-)
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1641,6 +1641,7 @@ static int nfs_update_inode(struct inode
unsigned long invalid = 0;
unsigned long now = jiffies;
unsigned long save_cache_validity;
+ bool cache_revalidated = true;
dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
__func__, inode->i_sb->s_id, inode->i_ino,
@@ -1702,22 +1703,28 @@ static int nfs_update_inode(struct inode
nfs_force_lookup_revalidate(inode);
inode->i_version = fattr->change_attr;
}
- } else
+ } else {
nfsi->cache_validity |= save_cache_validity;
+ cache_revalidated = false;
+ }
if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
- } else if (server->caps & NFS_CAP_MTIME)
+ } else if (server->caps & NFS_CAP_MTIME) {
nfsi->cache_validity |= save_cache_validity &
(NFS_INO_INVALID_ATTR
| NFS_INO_REVAL_FORCED);
+ cache_revalidated = false;
+ }
if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
- } else if (server->caps & NFS_CAP_CTIME)
+ } else if (server->caps & NFS_CAP_CTIME) {
nfsi->cache_validity |= save_cache_validity &
(NFS_INO_INVALID_ATTR
| NFS_INO_REVAL_FORCED);
+ cache_revalidated = false;
+ }
/* Check if our cached file size is stale */
if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
@@ -1737,19 +1744,23 @@ static int nfs_update_inode(struct inode
(long long)cur_isize,
(long long)new_isize);
}
- } else
+ } else {
nfsi->cache_validity |= save_cache_validity &
(NFS_INO_INVALID_ATTR
| NFS_INO_REVAL_PAGECACHE
| NFS_INO_REVAL_FORCED);
+ cache_revalidated = false;
+ }
if (fattr->valid & NFS_ATTR_FATTR_ATIME)
memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
- else if (server->caps & NFS_CAP_ATIME)
+ else if (server->caps & NFS_CAP_ATIME) {
nfsi->cache_validity |= save_cache_validity &
(NFS_INO_INVALID_ATIME
| NFS_INO_REVAL_FORCED);
+ cache_revalidated = false;
+ }
if (fattr->valid & NFS_ATTR_FATTR_MODE) {
if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
@@ -1758,36 +1769,42 @@ static int nfs_update_inode(struct inode
inode->i_mode = newmode;
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
}
- } else if (server->caps & NFS_CAP_MODE)
+ } else if (server->caps & NFS_CAP_MODE) {
nfsi->cache_validity |= save_cache_validity &
(NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
| NFS_INO_REVAL_FORCED);
+ cache_revalidated = false;
+ }
if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
if (!uid_eq(inode->i_uid, fattr->uid)) {
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
inode->i_uid = fattr->uid;
}
- } else if (server->caps & NFS_CAP_OWNER)
+ } else if (server->caps & NFS_CAP_OWNER) {
nfsi->cache_validity |= save_cache_validity &
(NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
| NFS_INO_REVAL_FORCED);
+ cache_revalidated = false;
+ }
if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
if (!gid_eq(inode->i_gid, fattr->gid)) {
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
inode->i_gid = fattr->gid;
}
- } else if (server->caps & NFS_CAP_OWNER_GROUP)
+ } else if (server->caps & NFS_CAP_OWNER_GROUP) {
nfsi->cache_validity |= save_cache_validity &
(NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
| NFS_INO_REVAL_FORCED);
+ cache_revalidated = false;
+ }
if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
if (inode->i_nlink != fattr->nlink) {
@@ -1796,19 +1813,22 @@ static int nfs_update_inode(struct inode
invalid |= NFS_INO_INVALID_DATA;
set_nlink(inode, fattr->nlink);
}
- } else if (server->caps & NFS_CAP_NLINK)
+ } else if (server->caps & NFS_CAP_NLINK) {
nfsi->cache_validity |= save_cache_validity &
(NFS_INO_INVALID_ATTR
| NFS_INO_REVAL_FORCED);
+ cache_revalidated = false;
+ }
if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
/*
* report the blocks in 512byte units
*/
inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
- }
- if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
+ } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
inode->i_blocks = fattr->du.nfs2.blocks;
+ else
+ cache_revalidated = false;
/* Update attrtimeo value if we're out of the unstable period */
if (invalid & NFS_INO_INVALID_ATTR) {
@@ -1818,9 +1838,13 @@ static int nfs_update_inode(struct inode
/* Set barrier to be more recent than all outstanding updates */
nfsi->attr_gencount = nfs_inc_attr_generation_counter();
} else {
- if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
- if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
- nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
+ if (cache_revalidated) {
+ if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
+ nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
+ nfsi->attrtimeo <<= 1;
+ if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
+ nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
+ }
nfsi->attrtimeo_timestamp = now;
}
/* Set the barrier to be more recent than this fattr */
@@ -1829,7 +1853,7 @@ static int nfs_update_inode(struct inode
}
/* Don't declare attrcache up to date if there were no attrs! */
- if (fattr->valid != 0)
+ if (cache_revalidated)
invalid &= ~NFS_INO_INVALID_ATTR;
/* Don't invalidate the data if we were to blame */
Patches currently in stable-queue which might be from trond.myklebust@xxxxxxxxxxxxxxx are
queue-4.4/pnfs-flexfiles-fix-an-oopsable-typo-in-ff_mirror_match_fh.patch
queue-4.4/sunrpc-fixup-socket-wait-for-memory.patch
queue-4.4/nfs-fix-attribute-cache-revalidation.patch
queue-4.4/nfs-fix-race-in-__update_open_stateid.patch
queue-4.4/pnfs-flexfiles-fix-an-xdr-encoding-bug-in-layoutreturn.patch
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