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authorTrond Myklebust <trond.myklebust@fys.uio.no>2005-10-17 06:02:00 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-17 14:47:16 -0700
commitb3c52da33ce95747b1bff86cce716d4f1397f14a (patch)
tree7958a929e5b9486bf0b5358776078c1bc71faf88 /fs
parent13b58ee51802a45d2b8853ffe0003d9fa768195c (diff)
downloadop-kernel-dev-b3c52da33ce95747b1bff86cce716d4f1397f14a.zip
op-kernel-dev-b3c52da33ce95747b1bff86cce716d4f1397f14a.tar.gz
[PATCH] NFS: Fix cache consistency races
If the data cache has been marked as potentially invalid by nfs_refresh_inode, we should invalidate it rather than assume that changes are due to our own activity. Also ensure that we always start with a valid cache before declaring it to be protected by a delegation. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/delegation.c4
-rw-r--r--fs/nfs/file.c3
-rw-r--r--fs/nfs/inode.c7
3 files changed, 8 insertions, 6 deletions
diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index d7f7eb6..4a36839 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -85,6 +85,10 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
struct nfs_delegation *delegation;
int status = 0;
+ /* Ensure we first revalidate the attributes and page cache! */
+ if ((nfsi->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATTR)))
+ __nfs_revalidate_inode(NFS_SERVER(inode), inode);
+
delegation = nfs_alloc_delegation();
if (delegation == NULL)
return -ENOMEM;
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index f6b9eda..6bdcfa9 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -137,7 +137,8 @@ static int nfs_revalidate_file(struct inode *inode, struct file *filp)
struct nfs_inode *nfsi = NFS_I(inode);
int retval = 0;
- if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) || nfs_attribute_timeout(inode))
+ if ((nfsi->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATTR))
+ || nfs_attribute_timeout(inode))
retval = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
nfs_revalidate_mapping(inode, filp->f_mapping);
return 0;
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 6922469d..6be46d2 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1226,10 +1226,6 @@ int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
loff_t cur_size, new_isize;
int data_unstable;
- /* Do we hold a delegation? */
- if (nfs_have_delegation(inode, FMODE_READ))
- return 0;
-
spin_lock(&inode->i_lock);
/* Are we in the process of updating data on the server? */
@@ -1350,7 +1346,8 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsign
nfsi->read_cache_jiffies = fattr->timestamp;
/* Are we racing with known updates of the metadata on the server? */
- data_unstable = ! nfs_verify_change_attribute(inode, verifier);
+ data_unstable = ! (nfs_verify_change_attribute(inode, verifier) ||
+ (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE));
/* Check if our cached file size is stale */
new_isize = nfs_size_to_loff_t(fattr->size);
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