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NFS: Clean up cache validity checking

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Consolidate the open-coded checking of NFS_I(inode)->cache_validity
into a couple of helper functions.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust
2016-12-08 18:18:38 -05:00
parent 58ff41842c
commit 61540bf6bb
3 changed files with 34 additions and 22 deletions
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43
fs/nfs/inode.c
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@@ -160,6 +160,36 @@ int nfs_sync_mapping(struct address_space *mapping)
return ret;
}
static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
{
unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
/* Special case for the pagecache or access cache */
if (flags == NFS_INO_REVAL_PAGECACHE &&
!(cache_validity & NFS_INO_REVAL_FORCED))
return false;
return (cache_validity & flags) != 0;
}
static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
{
unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
if ((cache_validity & flags) != 0)
return true;
if (nfs_attribute_timeout(inode))
return true;
return false;
}
bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
{
if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
return nfs_check_cache_invalid_delegated(inode, flags);
return nfs_check_cache_invalid_not_delegated(inode, flags);
}
static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
{
struct nfs_inode *nfsi = NFS_I(inode);
@@ -1116,17 +1146,8 @@ static int nfs_invalidate_mapping(struct inode *inode, struct address_space *map
bool nfs_mapping_need_revalidate_inode(struct inode *inode)
{
unsigned long cache_validity = NFS_I(inode)->cache_validity;
if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) {
const unsigned long force_reval =
NFS_INO_REVAL_PAGECACHE|NFS_INO_REVAL_FORCED;
return (cache_validity & force_reval) == force_reval;
}
return (cache_validity & NFS_INO_REVAL_PAGECACHE)
|| nfs_attribute_timeout(inode)
|| NFS_STALE(inode);
return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
NFS_STALE(inode);
}
int nfs_revalidate_mapping_rcu(struct inode *inode)