NFS: Fix a few further cache consistency regressions
Steve Dickson writes:
Doing the following:
1. On server:
$ mkdir ~/t
$ echo Hello > ~/t/tmp
2. On client, wait for a string to appear in this file:
$ until grep -q foo t/tmp ; do echo -n . ; sleep 1 ; done
3. On server, create a *new* file with the same name containing that
string:
$ mv ~/t/tmp ~/t/tmp.old; echo foo > ~/t/tmp
will show how the client will never (and I mean never ;-) ) see
the updated file.
The problem is that we do not update nfsi->cache_change_attribute when the
file changes on the server (we only update it when our client makes the
changes). This again means that functions like nfs_check_verifier() will
fail to register when the parent directory has changed and should trigger
a dentry lookup revalidation.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index b551b19..afd75d0 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -54,7 +54,7 @@
#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
static void nfs_invalidate_inode(struct inode *);
-static int nfs_update_inode(struct inode *, struct nfs_fattr *, unsigned long);
+static int nfs_update_inode(struct inode *, struct nfs_fattr *);
static struct inode *nfs_alloc_inode(struct super_block *sb);
static void nfs_destroy_inode(struct inode *);
@@ -1080,8 +1080,6 @@
int status = -ESTALE;
struct nfs_fattr fattr;
struct nfs_inode *nfsi = NFS_I(inode);
- unsigned long verifier;
- unsigned long cache_validity;
dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
inode->i_sb->s_id, (long long)NFS_FILEID(inode));
@@ -1106,8 +1104,6 @@
}
}
- /* Protect against RPC races by saving the change attribute */
- verifier = nfs_save_change_attribute(inode);
status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
if (status != 0) {
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
@@ -1122,7 +1118,7 @@
}
spin_lock(&inode->i_lock);
- status = nfs_update_inode(inode, &fattr, verifier);
+ status = nfs_update_inode(inode, &fattr);
if (status) {
spin_unlock(&inode->i_lock);
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
@@ -1130,20 +1126,11 @@
(long long)NFS_FILEID(inode), status);
goto out;
}
- cache_validity = nfsi->cache_validity;
- nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
-
- /*
- * We may need to keep the attributes marked as invalid if
- * we raced with nfs_end_attr_update().
- */
- if (time_after_eq(verifier, nfsi->cache_change_attribute))
- nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
spin_unlock(&inode->i_lock);
nfs_revalidate_mapping(inode, inode->i_mapping);
- if (cache_validity & NFS_INO_INVALID_ACL)
+ if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
nfs_zap_acl_cache(inode);
dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
@@ -1346,10 +1333,8 @@
return 0;
spin_lock(&inode->i_lock);
nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
- if (nfs_verify_change_attribute(inode, fattr->time_start))
- nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
if (time_after(fattr->time_start, nfsi->last_updated))
- status = nfs_update_inode(inode, fattr, fattr->time_start);
+ status = nfs_update_inode(inode, fattr);
else
status = nfs_check_inode_attributes(inode, fattr);
@@ -1375,10 +1360,7 @@
nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
goto out;
}
- status = nfs_update_inode(inode, fattr, fattr->time_start);
- if (time_after_eq(fattr->time_start, nfsi->cache_change_attribute))
- nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
- nfsi->cache_change_attribute = jiffies;
+ status = nfs_update_inode(inode, fattr);
out:
spin_unlock(&inode->i_lock);
return status;
@@ -1396,12 +1378,12 @@
*
* A very similar scenario holds for the dir cache.
*/
-static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsigned long verifier)
+static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
{
struct nfs_inode *nfsi = NFS_I(inode);
loff_t cur_isize, new_isize;
unsigned int invalid = 0;
- int data_unstable;
+ int data_stable;
dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
__FUNCTION__, inode->i_sb->s_id, inode->i_ino,
@@ -1432,8 +1414,9 @@
nfsi->last_updated = jiffies;
/* Are we racing with known updates of the metadata on the server? */
- data_unstable = ! (nfs_verify_change_attribute(inode, verifier) ||
- (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE));
+ data_stable = nfs_verify_change_attribute(inode, fattr->time_start);
+ if (data_stable)
+ nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
/* Check if our cached file size is stale */
new_isize = nfs_size_to_loff_t(fattr->size);
@@ -1442,7 +1425,7 @@
/* Do we perhaps have any outstanding writes? */
if (nfsi->npages == 0) {
/* No, but did we race with nfs_end_data_update()? */
- if (time_after_eq(verifier, nfsi->cache_change_attribute)) {
+ if (data_stable) {
inode->i_size = new_isize;
invalid |= NFS_INO_INVALID_DATA;
}
@@ -1451,6 +1434,7 @@
inode->i_size = new_isize;
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
}
+ nfsi->cache_change_attribute = jiffies;
dprintk("NFS: isize change on server for file %s/%ld\n",
inode->i_sb->s_id, inode->i_ino);
}
@@ -1460,8 +1444,8 @@
memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
dprintk("NFS: mtime change on server for file %s/%ld\n",
inode->i_sb->s_id, inode->i_ino);
- if (!data_unstable)
- invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
+ invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
+ nfsi->cache_change_attribute = jiffies;
}
if ((fattr->valid & NFS_ATTR_FATTR_V4)
@@ -1469,15 +1453,15 @@
dprintk("NFS: change_attr change on server for file %s/%ld\n",
inode->i_sb->s_id, inode->i_ino);
nfsi->change_attr = fattr->change_attr;
- if (!data_unstable)
- invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
+ invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
+ nfsi->cache_change_attribute = jiffies;
}
/* If ctime has changed we should definitely clear access+acl caches */
if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
- if (!data_unstable)
- invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
+ invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
+ nfsi->cache_change_attribute = jiffies;
}
memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
@@ -1515,6 +1499,8 @@
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
|| S_ISLNK(inode->i_mode)))
invalid &= ~NFS_INO_INVALID_DATA;
+ if (data_stable)
+ invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
if (!nfs_have_delegation(inode, FMODE_READ))
nfsi->cache_validity |= invalid;