![David Howells](/assets/img/avatar_default.png)
In cifs_readpages(), we may decide we don't want to read a page after all - but the page may already have passed through fscache_read_or_alloc_pages() and thus have marks and reservations set. Thus we have to call fscache_readpages_cancel() or fscache_uncache_page() on the pages we're returning to clear the marks. NFS, AFS and 9P should be unaffected by this as they call read_cache_pages() which does the cleanup for you. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
243 lines
6.8 KiB
C
243 lines
6.8 KiB
C
/*
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* fs/cifs/fscache.c - CIFS filesystem cache interface
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*
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* Copyright (c) 2010 Novell, Inc.
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* Author(s): Suresh Jayaraman <sjayaraman@suse.de>
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "fscache.h"
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#include "cifsglob.h"
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
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void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server)
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{
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server->fscache =
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fscache_acquire_cookie(cifs_fscache_netfs.primary_index,
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&cifs_fscache_server_index_def, server);
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cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
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__func__, server, server->fscache);
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}
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void cifs_fscache_release_client_cookie(struct TCP_Server_Info *server)
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{
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cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
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__func__, server, server->fscache);
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fscache_relinquish_cookie(server->fscache, 0);
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server->fscache = NULL;
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}
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void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon)
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{
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struct TCP_Server_Info *server = tcon->ses->server;
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tcon->fscache =
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fscache_acquire_cookie(server->fscache,
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&cifs_fscache_super_index_def, tcon);
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cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
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__func__, server->fscache, tcon->fscache);
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}
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void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon)
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{
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cifs_dbg(FYI, "%s: (0x%p)\n", __func__, tcon->fscache);
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fscache_relinquish_cookie(tcon->fscache, 0);
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tcon->fscache = NULL;
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}
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static void cifs_fscache_enable_inode_cookie(struct inode *inode)
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{
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struct cifsInodeInfo *cifsi = CIFS_I(inode);
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struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
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struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
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if (cifsi->fscache)
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return;
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE) {
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cifsi->fscache = fscache_acquire_cookie(tcon->fscache,
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&cifs_fscache_inode_object_def, cifsi);
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cifs_dbg(FYI, "%s: got FH cookie (0x%p/0x%p)\n",
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__func__, tcon->fscache, cifsi->fscache);
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}
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}
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void cifs_fscache_release_inode_cookie(struct inode *inode)
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{
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struct cifsInodeInfo *cifsi = CIFS_I(inode);
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if (cifsi->fscache) {
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cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache);
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fscache_relinquish_cookie(cifsi->fscache, 0);
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cifsi->fscache = NULL;
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}
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}
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static void cifs_fscache_disable_inode_cookie(struct inode *inode)
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{
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struct cifsInodeInfo *cifsi = CIFS_I(inode);
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if (cifsi->fscache) {
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cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache);
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fscache_uncache_all_inode_pages(cifsi->fscache, inode);
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fscache_relinquish_cookie(cifsi->fscache, 1);
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cifsi->fscache = NULL;
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}
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}
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void cifs_fscache_set_inode_cookie(struct inode *inode, struct file *filp)
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{
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if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
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cifs_fscache_disable_inode_cookie(inode);
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else
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cifs_fscache_enable_inode_cookie(inode);
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}
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void cifs_fscache_reset_inode_cookie(struct inode *inode)
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{
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struct cifsInodeInfo *cifsi = CIFS_I(inode);
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struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
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struct fscache_cookie *old = cifsi->fscache;
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if (cifsi->fscache) {
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/* retire the current fscache cache and get a new one */
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fscache_relinquish_cookie(cifsi->fscache, 1);
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cifsi->fscache = fscache_acquire_cookie(
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cifs_sb_master_tcon(cifs_sb)->fscache,
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&cifs_fscache_inode_object_def,
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cifsi);
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cifs_dbg(FYI, "%s: new cookie 0x%p oldcookie 0x%p\n",
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__func__, cifsi->fscache, old);
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}
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}
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int cifs_fscache_release_page(struct page *page, gfp_t gfp)
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{
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if (PageFsCache(page)) {
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struct inode *inode = page->mapping->host;
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struct cifsInodeInfo *cifsi = CIFS_I(inode);
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cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
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__func__, page, cifsi->fscache);
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if (!fscache_maybe_release_page(cifsi->fscache, page, gfp))
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return 0;
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}
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return 1;
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}
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static void cifs_readpage_from_fscache_complete(struct page *page, void *ctx,
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int error)
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{
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cifs_dbg(FYI, "%s: (0x%p/%d)\n", __func__, page, error);
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if (!error)
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SetPageUptodate(page);
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unlock_page(page);
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}
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/*
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* Retrieve a page from FS-Cache
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*/
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int __cifs_readpage_from_fscache(struct inode *inode, struct page *page)
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{
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int ret;
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cifs_dbg(FYI, "%s: (fsc:%p, p:%p, i:0x%p\n",
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__func__, CIFS_I(inode)->fscache, page, inode);
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ret = fscache_read_or_alloc_page(CIFS_I(inode)->fscache, page,
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cifs_readpage_from_fscache_complete,
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NULL,
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GFP_KERNEL);
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switch (ret) {
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case 0: /* page found in fscache, read submitted */
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cifs_dbg(FYI, "%s: submitted\n", __func__);
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return ret;
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case -ENOBUFS: /* page won't be cached */
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case -ENODATA: /* page not in cache */
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cifs_dbg(FYI, "%s: %d\n", __func__, ret);
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return 1;
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default:
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cifs_dbg(VFS, "unknown error ret = %d\n", ret);
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}
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return ret;
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}
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/*
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* Retrieve a set of pages from FS-Cache
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*/
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int __cifs_readpages_from_fscache(struct inode *inode,
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struct address_space *mapping,
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struct list_head *pages,
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unsigned *nr_pages)
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{
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int ret;
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cifs_dbg(FYI, "%s: (0x%p/%u/0x%p)\n",
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__func__, CIFS_I(inode)->fscache, *nr_pages, inode);
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ret = fscache_read_or_alloc_pages(CIFS_I(inode)->fscache, mapping,
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pages, nr_pages,
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cifs_readpage_from_fscache_complete,
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NULL,
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mapping_gfp_mask(mapping));
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switch (ret) {
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case 0: /* read submitted to the cache for all pages */
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cifs_dbg(FYI, "%s: submitted\n", __func__);
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return ret;
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case -ENOBUFS: /* some pages are not cached and can't be */
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case -ENODATA: /* some pages are not cached */
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cifs_dbg(FYI, "%s: no page\n", __func__);
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return 1;
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default:
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cifs_dbg(FYI, "unknown error ret = %d\n", ret);
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}
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return ret;
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}
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void __cifs_readpage_to_fscache(struct inode *inode, struct page *page)
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{
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int ret;
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cifs_dbg(FYI, "%s: (fsc: %p, p: %p, i: %p)\n",
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__func__, CIFS_I(inode)->fscache, page, inode);
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ret = fscache_write_page(CIFS_I(inode)->fscache, page, GFP_KERNEL);
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if (ret != 0)
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fscache_uncache_page(CIFS_I(inode)->fscache, page);
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}
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void __cifs_fscache_readpages_cancel(struct inode *inode, struct list_head *pages)
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{
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cifs_dbg(FYI, "%s: (fsc: %p, i: %p)\n",
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__func__, CIFS_I(inode)->fscache, inode);
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fscache_readpages_cancel(CIFS_I(inode)->fscache, pages);
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}
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void __cifs_fscache_invalidate_page(struct page *page, struct inode *inode)
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{
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struct cifsInodeInfo *cifsi = CIFS_I(inode);
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struct fscache_cookie *cookie = cifsi->fscache;
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cifs_dbg(FYI, "%s: (0x%p/0x%p)\n", __func__, page, cookie);
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fscache_wait_on_page_write(cookie, page);
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fscache_uncache_page(cookie, page);
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}
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