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NFS: Another inode revalidation improvement

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If we're trying to update the inode because a previous update left the
cache in a partially unrevalidated state, then allow the update if the
change attrs match.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2021-04-09 09:30:21 -04:00
parent 6f9be83d07
commit 7b24dacf08
1 changed files with 29 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

30
fs/nfs/inode.c
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@ -1754,6 +1754,34 @@ static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr,
return 0;
}
/**
* nfs_inode_finish_partial_attr_update - complete a previous inode update
* @fattr: attributes
* @inode: pointer to inode
*
* Returns '1' if the last attribute update left the inode cached
* attributes in a partially unrevalidated state, and @fattr
* matches the change attribute of that partial update.
* Otherwise returns '0'.
*/
static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr,
const struct inode *inode)
{
const unsigned long check_valid =
NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME |
NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER |
NFS_INO_INVALID_NLINK;
unsigned long cache_validity = NFS_I(inode)->cache_validity;
if (!(cache_validity & NFS_INO_INVALID_CHANGE) &&
(cache_validity & check_valid) != 0 &&
(fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0)
return 1;
return 0;
}
static int nfs_refresh_inode_locked(struct inode *inode,
struct nfs_fattr *fattr)
{
@ -1762,7 +1790,7 @@ static int nfs_refresh_inode_locked(struct inode *inode,
trace_nfs_refresh_inode_enter(inode);
if (attr_cmp > 0)
if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode))
ret = nfs_update_inode(inode, fattr);
else if (attr_cmp == 0)
ret = nfs_check_inode_attributes(inode, fattr);