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authorSuresh Jayaraman <sjayaraman@suse.de>2010-07-05 18:13:25 +0530
committerSteve French <sfrench@us.ibm.com>2010-08-02 12:40:37 +0000
commit56698236e1294848c63d4768673865ae5a9c69e0 (patch)
treece6d43104a236595763759fe68c26ca3089abdd1 /fs/cifs/fscache.c
parent9dc06558c223bbc08290917ac44c25963bc09e43 (diff)
downloadlinux-56698236e1294848c63d4768673865ae5a9c69e0.tar.bz2
cifs: read pages from FS-Cache
Read pages from a FS-Cache data storage object into a CIFS inode. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/fscache.c')
-rw-r--r--fs/cifs/fscache.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/fs/cifs/fscache.c b/fs/cifs/fscache.c
index 3b1636704c85..9f3f5c4be161 100644
--- a/fs/cifs/fscache.c
+++ b/fs/cifs/fscache.c
@@ -140,6 +140,79 @@ int cifs_fscache_release_page(struct page *page, gfp_t gfp)
return 1;
}
+static void cifs_readpage_from_fscache_complete(struct page *page, void *ctx,
+ int error)
+{
+ cFYI(1, "CFS: readpage_from_fscache_complete (0x%p/%d)",
+ page, error);
+ if (!error)
+ SetPageUptodate(page);
+ unlock_page(page);
+}
+
+/*
+ * Retrieve a page from FS-Cache
+ */
+int __cifs_readpage_from_fscache(struct inode *inode, struct page *page)
+{
+ int ret;
+
+ cFYI(1, "CIFS: readpage_from_fscache(fsc:%p, p:%p, i:0x%p",
+ CIFS_I(inode)->fscache, page, inode);
+ ret = fscache_read_or_alloc_page(CIFS_I(inode)->fscache, page,
+ cifs_readpage_from_fscache_complete,
+ NULL,
+ GFP_KERNEL);
+ switch (ret) {
+
+ case 0: /* page found in fscache, read submitted */
+ cFYI(1, "CIFS: readpage_from_fscache: submitted");
+ return ret;
+ case -ENOBUFS: /* page won't be cached */
+ case -ENODATA: /* page not in cache */
+ cFYI(1, "CIFS: readpage_from_fscache %d", ret);
+ return 1;
+
+ default:
+ cERROR(1, "unknown error ret = %d", ret);
+ }
+ return ret;
+}
+
+/*
+ * Retrieve a set of pages from FS-Cache
+ */
+int __cifs_readpages_from_fscache(struct inode *inode,
+ struct address_space *mapping,
+ struct list_head *pages,
+ unsigned *nr_pages)
+{
+ int ret;
+
+ cFYI(1, "CIFS: __cifs_readpages_from_fscache (0x%p/%u/0x%p)",
+ CIFS_I(inode)->fscache, *nr_pages, inode);
+ ret = fscache_read_or_alloc_pages(CIFS_I(inode)->fscache, mapping,
+ pages, nr_pages,
+ cifs_readpage_from_fscache_complete,
+ NULL,
+ mapping_gfp_mask(mapping));
+ switch (ret) {
+ case 0: /* read submitted to the cache for all pages */
+ cFYI(1, "CIFS: readpages_from_fscache: submitted");
+ return ret;
+
+ case -ENOBUFS: /* some pages are not cached and can't be */
+ case -ENODATA: /* some pages are not cached */
+ cFYI(1, "CIFS: readpages_from_fscache: no page");
+ return 1;
+
+ default:
+ cFYI(1, "unknown error ret = %d", ret);
+ }
+
+ return ret;
+}
+
void __cifs_readpage_to_fscache(struct inode *inode, struct page *page)
{
int ret;