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[PATCH] NFS: Fix cache consistency races

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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>
This commit is contained in:
Trond Myklebust 2005-10-17 06:02:00 -04:00 committed by Linus Torvalds
parent 13b58ee518
commit b3c52da33c
3 changed files with 8 additions and 6 deletions
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4
fs/nfs/delegation.c
View file

@ -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;

3
fs/nfs/file.c
View file

@ -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;

7
fs/nfs/inode.c
View file

@ -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);