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NFS: Invalidate FsCache page flags when cache removed 

Invalidate the FsCache page flags on the pages belonging to an inode when the
cache backing that NFS inode is removed.

This allows a live cache to be withdrawn.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
This commit is contained in:
David Howells 2009-04-03 16:42:43 +01:00
parent ef79c097bb
commit d599064a1b
1 changed files with 40 additions and 0 deletions
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40
fs/nfs/fscache-index.c
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@ -252,6 +252,45 @@ enum fscache_checkaux nfs_fscache_inode_check_aux(void *cookie_netfs_data,
return FSCACHE_CHECKAUX_OKAY; return FSCACHE_CHECKAUX_OKAY;
} }
/*
* Indication from FS-Cache that the cookie is no longer cached
* - This function is called when the backing store currently caching a cookie
* is removed
* - The netfs should use this to clean up any markers indicating cached pages
* - This is mandatory for any object that may have data
*/
static void nfs_fscache_inode_now_uncached(void *cookie_netfs_data)
{
struct nfs_inode *nfsi = cookie_netfs_data;
struct pagevec pvec;
pgoff_t first;
int loop, nr_pages;
pagevec_init(&pvec, 0);
first = 0;
dprintk("NFS: nfs_inode_now_uncached: nfs_inode 0x%p\n", nfsi);
for (;;) {
/* grab a bunch of pages to unmark */
nr_pages = pagevec_lookup(&pvec,
nfsi->vfs_inode.i_mapping,
first,
PAGEVEC_SIZE - pagevec_count(&pvec));
if (!nr_pages)
break;
for (loop = 0; loop < nr_pages; loop++)
ClearPageFsCache(pvec.pages[loop]);
first = pvec.pages[nr_pages - 1]->index + 1;
pvec.nr = nr_pages;
pagevec_release(&pvec);
cond_resched();
}
}
/* /*
* Define the inode object for FS-Cache. This is used to describe an inode * Define the inode object for FS-Cache. This is used to describe an inode
* object to fscache_acquire_cookie(). It is keyed by the NFS file handle for * object to fscache_acquire_cookie(). It is keyed by the NFS file handle for
@ -268,4 +307,5 @@ const struct fscache_cookie_def nfs_fscache_inode_object_def = {
.get_attr = nfs_fscache_inode_get_attr, .get_attr = nfs_fscache_inode_get_attr,
.get_aux = nfs_fscache_inode_get_aux, .get_aux = nfs_fscache_inode_get_aux,
.check_aux = nfs_fscache_inode_check_aux, .check_aux = nfs_fscache_inode_check_aux,
.now_uncached = nfs_fscache_inode_now_uncached,
}; };