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NFS: Clean up weak cache consistency code 

...and ensure that nfs_update_inode() respects wcc

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2006-01-03 09:55:40 +01:00
parent fa178f29c0
commit a895b4a198
1 changed files with 40 additions and 20 deletions
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60
fs/nfs/inode.c
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@ -1248,6 +1248,33 @@ void nfs_end_data_update(struct inode *inode)
atomic_dec(&nfsi->data_updates);
}
static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
{
struct nfs_inode *nfsi = NFS_I(inode);
if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0
&& nfsi->change_attr == fattr->pre_change_attr) {
nfsi->change_attr = fattr->change_attr;
nfsi->cache_change_attribute = jiffies;
}
/* If we have atomic WCC data, we may update some attributes */
if ((fattr->valid & NFS_ATTR_WCC) != 0) {
if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
nfsi->cache_change_attribute = jiffies;
}
if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
nfsi->cache_change_attribute = jiffies;
}
if (inode->i_size == fattr->pre_size && nfsi->npages == 0) {
inode->i_size = fattr->size;
nfsi->cache_change_attribute = jiffies;
}
}
}
/**
* nfs_check_inode_attributes - verify consistency of the inode attribute cache
* @inode - pointer to inode
@ -1264,22 +1291,20 @@ static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fat
int data_unstable;
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
return 0;
/* Are we in the process of updating data on the server? */
data_unstable = nfs_caches_unstable(inode);
if (fattr->valid & NFS_ATTR_FATTR_V4) {
if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0
&& nfsi->change_attr == fattr->pre_change_attr)
nfsi->change_attr = fattr->change_attr;
if (nfsi->change_attr != fattr->change_attr) {
nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
if (!data_unstable)
nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
}
}
/* Do atomic weak cache consistency updates */
nfs_wcc_update_inode(inode, fattr);
if ((fattr->valid & NFS_ATTR_FATTR) == 0) {
return 0;
if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
nfsi->change_attr != fattr->change_attr) {
nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
if (!data_unstable)
nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
}
/* Has the inode gone and changed behind our back? */
@ -1291,14 +1316,6 @@ static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fat
cur_size = i_size_read(inode);
new_isize = nfs_size_to_loff_t(fattr->size);
/* If we have atomic WCC data, we may update some attributes */
if ((fattr->valid & NFS_ATTR_WCC) != 0) {
if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime))
memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime))
memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
}
/* Verify a few of the more important attributes */
if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
@ -1426,6 +1443,9 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
if (data_stable)
nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
/* Do atomic weak cache consistency updates */
nfs_wcc_update_inode(inode, fattr);
/* Check if our cached file size is stale */
new_isize = nfs_size_to_loff_t(fattr->size);
cur_isize = i_size_read(inode);