diff options
author | Suresh Jayaraman <sjayaraman@suse.de> | 2010-07-05 18:13:25 +0530 |
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committer | Steve French <sfrench@us.ibm.com> | 2010-08-02 12:40:37 +0000 |
commit | 56698236e1294848c63d4768673865ae5a9c69e0 (patch) | |
tree | ce6d43104a236595763759fe68c26ca3089abdd1 /fs/cifs/fscache.c | |
parent | 9dc06558c223bbc08290917ac44c25963bc09e43 (diff) |
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.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/fs/cifs/fscache.c b/fs/cifs/fscache.c index 3b1636704c8..9f3f5c4be16 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; |