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authorDavid Howells <dhowells@redhat.com>2009-04-03 11:42:43 -0400
committerDavid Howells <dhowells@redhat.com>2009-04-03 11:42:43 -0400
commitd599064a1bca7bcbaabe54b94fa73ea86952cae3 (patch)
treef2b6d6b79053ea8a8b8178219203f30cc9c1c0b4 /fs/nfs/fscache-index.c
parentef79c097bbe9724e13937271b3457df560e00370 (diff)
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 This allows a live cache to be withdrawn.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>
Diffstat (limited to 'fs/nfs/fscache-index.c')
-rw-r--r--fs/nfs/fscache-index.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/fs/nfs/fscache-index.c b/fs/nfs/fscache-index.c
index 7bc54acb7b00..a119b5691e7c 100644
--- a/fs/nfs/fscache-index.c
+++ b/fs/nfs/fscache-index.c
@@ -253,6 +253,45 @@ enum fscache_checkaux nfs_fscache_inode_check_aux(void *cookie_netfs_data,
253} 253}
254 254
255/* 255/*
256 * Indication from FS-Cache that the cookie is no longer cached
257 * - This function is called when the backing store currently caching a cookie
258 * is removed
259 * - The netfs should use this to clean up any markers indicating cached pages
260 * - This is mandatory for any object that may have data
261 */
262static void nfs_fscache_inode_now_uncached(void *cookie_netfs_data)
263{
264 struct nfs_inode *nfsi = cookie_netfs_data;
265 struct pagevec pvec;
266 pgoff_t first;
267 int loop, nr_pages;
268
269 pagevec_init(&pvec, 0);
270 first = 0;
271
272 dprintk("NFS: nfs_inode_now_uncached: nfs_inode 0x%p\n", nfsi);
273
274 for (;;) {
275 /* grab a bunch of pages to unmark */
276 nr_pages = pagevec_lookup(&pvec,
277 nfsi->vfs_inode.i_mapping,
278 first,
279 PAGEVEC_SIZE - pagevec_count(&pvec));
280 if (!nr_pages)
281 break;
282
283 for (loop = 0; loop < nr_pages; loop++)
284 ClearPageFsCache(pvec.pages[loop]);
285
286 first = pvec.pages[nr_pages - 1]->index + 1;
287
288 pvec.nr = nr_pages;
289 pagevec_release(&pvec);
290 cond_resched();
291 }
292}
293
294/*
256 * Define the inode object for FS-Cache. This is used to describe an inode 295 * Define the inode object for FS-Cache. This is used to describe an inode
257 * object to fscache_acquire_cookie(). It is keyed by the NFS file handle for 296 * object to fscache_acquire_cookie(). It is keyed by the NFS file handle for
258 * an inode. 297 * an inode.
@@ -268,4 +307,5 @@ const struct fscache_cookie_def nfs_fscache_inode_object_def = {
268 .get_attr = nfs_fscache_inode_get_attr, 307 .get_attr = nfs_fscache_inode_get_attr,
269 .get_aux = nfs_fscache_inode_get_aux, 308 .get_aux = nfs_fscache_inode_get_aux,
270 .check_aux = nfs_fscache_inode_check_aux, 309 .check_aux = nfs_fscache_inode_check_aux,
310 .now_uncached = nfs_fscache_inode_now_uncached,
271}; 311};