| /* |
| * fs/cifs/fscache.c - CIFS filesystem cache interface |
| * |
| * Copyright (c) 2010 Novell, Inc. |
| * Author(s): Suresh Jayaraman <sjayaraman@suse.de> |
| * |
| * This library is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Lesser General Public License as published |
| * by the Free Software Foundation; either version 2.1 of the License, or |
| * (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| * the GNU Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public License |
| * along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #include "fscache.h" |
| #include "cifsglob.h" |
| #include "cifs_debug.h" |
| #include "cifs_fs_sb.h" |
| |
| void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) |
| { |
| server->fscache = |
| fscache_acquire_cookie(cifs_fscache_netfs.primary_index, |
| &cifs_fscache_server_index_def, server); |
| cFYI(1, "CIFS: get client cookie (0x%p/0x%p)", server, |
| server->fscache); |
| } |
| |
| void cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) |
| { |
| cFYI(1, "CIFS: release client cookie (0x%p/0x%p)", server, |
| server->fscache); |
| fscache_relinquish_cookie(server->fscache, 0); |
| server->fscache = NULL; |
| } |
| |
| void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) |
| { |
| struct TCP_Server_Info *server = tcon->ses->server; |
| |
| tcon->fscache = |
| fscache_acquire_cookie(server->fscache, |
| &cifs_fscache_super_index_def, tcon); |
| cFYI(1, "CIFS: get superblock cookie (0x%p/0x%p)", |
| server->fscache, tcon->fscache); |
| } |
| |
| void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) |
| { |
| cFYI(1, "CIFS: releasing superblock cookie (0x%p)", tcon->fscache); |
| fscache_relinquish_cookie(tcon->fscache, 0); |
| tcon->fscache = NULL; |
| } |
| |
| static void cifs_fscache_enable_inode_cookie(struct inode *inode) |
| { |
| struct cifsInodeInfo *cifsi = CIFS_I(inode); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
| |
| if (cifsi->fscache) |
| return; |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE) { |
| cifsi->fscache = fscache_acquire_cookie(tcon->fscache, |
| &cifs_fscache_inode_object_def, cifsi); |
| cFYI(1, "CIFS: got FH cookie (0x%p/0x%p)", tcon->fscache, |
| cifsi->fscache); |
| } |
| } |
| |
| void cifs_fscache_release_inode_cookie(struct inode *inode) |
| { |
| struct cifsInodeInfo *cifsi = CIFS_I(inode); |
| |
| if (cifsi->fscache) { |
| cFYI(1, "CIFS releasing inode cookie (0x%p)", |
| cifsi->fscache); |
| fscache_relinquish_cookie(cifsi->fscache, 0); |
| cifsi->fscache = NULL; |
| } |
| } |
| |
| static void cifs_fscache_disable_inode_cookie(struct inode *inode) |
| { |
| struct cifsInodeInfo *cifsi = CIFS_I(inode); |
| |
| if (cifsi->fscache) { |
| cFYI(1, "CIFS disabling inode cookie (0x%p)", |
| cifsi->fscache); |
| fscache_relinquish_cookie(cifsi->fscache, 1); |
| cifsi->fscache = NULL; |
| } |
| } |
| |
| void cifs_fscache_set_inode_cookie(struct inode *inode, struct file *filp) |
| { |
| if ((filp->f_flags & O_ACCMODE) != O_RDONLY) |
| cifs_fscache_disable_inode_cookie(inode); |
| else |
| cifs_fscache_enable_inode_cookie(inode); |
| } |
| |
| void cifs_fscache_reset_inode_cookie(struct inode *inode) |
| { |
| struct cifsInodeInfo *cifsi = CIFS_I(inode); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct fscache_cookie *old = cifsi->fscache; |
| |
| if (cifsi->fscache) { |
| /* retire the current fscache cache and get a new one */ |
| fscache_relinquish_cookie(cifsi->fscache, 1); |
| |
| cifsi->fscache = fscache_acquire_cookie( |
| cifs_sb_master_tcon(cifs_sb)->fscache, |
| &cifs_fscache_inode_object_def, |
| cifsi); |
| cFYI(1, "CIFS: new cookie 0x%p oldcookie 0x%p", |
| cifsi->fscache, old); |
| } |
| } |
| |
| int cifs_fscache_release_page(struct page *page, gfp_t gfp) |
| { |
| if (PageFsCache(page)) { |
| struct inode *inode = page->mapping->host; |
| struct cifsInodeInfo *cifsi = CIFS_I(inode); |
| |
| cFYI(1, "CIFS: fscache release page (0x%p/0x%p)", |
| page, cifsi->fscache); |
| if (!fscache_maybe_release_page(cifsi->fscache, page, gfp)) |
| return 0; |
| } |
| |
| 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; |
| |
| cFYI(1, "CIFS: readpage_to_fscache(fsc: %p, p: %p, i: %p", |
| CIFS_I(inode)->fscache, page, inode); |
| ret = fscache_write_page(CIFS_I(inode)->fscache, page, GFP_KERNEL); |
| if (ret != 0) |
| fscache_uncache_page(CIFS_I(inode)->fscache, page); |
| } |
| |
| void __cifs_fscache_invalidate_page(struct page *page, struct inode *inode) |
| { |
| struct cifsInodeInfo *cifsi = CIFS_I(inode); |
| struct fscache_cookie *cookie = cifsi->fscache; |
| |
| cFYI(1, "CIFS: fscache invalidatepage (0x%p/0x%p)", page, cookie); |
| fscache_wait_on_page_write(cookie, page); |
| fscache_uncache_page(cookie, page); |
| } |
| |