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NFS: Optimise away the close-to-open getattr if there is no cached data 

If there is no cached data, then there is no need to track the file
change attribute on close.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2015-09-04 15:07:37 -04:00
parent 7cc8c5cde0
commit 5cf9d70659
1 changed files with 10 additions and 3 deletions
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13
fs/nfs/inode.c
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@ -761,11 +761,13 @@ EXPORT_SYMBOL_GPL(nfs_put_lock_context);
* @ctx: pointer to context
* @is_sync: is this a synchronous close
*
* always ensure that the attributes are up to date if we're mounted
* with close-to-open semantics
* Ensure that the attributes are up to date if we're mounted
* with close-to-open semantics and we have cached data that will
* need to be revalidated on open.
*/
void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
{
struct nfs_inode *nfsi;
struct inode *inode;
struct nfs_server *server;
@ -774,7 +776,12 @@ void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
if (!is_sync)
return;
inode = d_inode(ctx->dentry);
if (!list_empty(&NFS_I(inode)->open_files))
nfsi = NFS_I(inode);
if (inode->i_mapping->nrpages == 0)
return;
if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
return;
if (!list_empty(&nfsi->open_files))
return;
server = NFS_SERVER(inode);
if (server->flags & NFS_MOUNT_NOCTO)