diff options
Diffstat (limited to 'fs/cifs/fscache.c')
| -rw-r--r-- | fs/cifs/fscache.c | 334 |
1 files changed, 0 insertions, 334 deletions
diff --git a/fs/cifs/fscache.c b/fs/cifs/fscache.c deleted file mode 100644 index ea6ace9c2417..000000000000 --- a/fs/cifs/fscache.c +++ /dev/null @@ -1,334 +0,0 @@ -/* - * 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" - -/* - * Key layout of CIFS server cache index object - */ -struct cifs_server_key { - struct { - uint16_t family; /* address family */ - __be16 port; /* IP port */ - } hdr; - union { - struct in_addr ipv4_addr; - struct in6_addr ipv6_addr; - }; -} __packed; - -/* - * Get a cookie for a server object keyed by {IPaddress,port,family} tuple - */ -void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) -{ - const struct sockaddr *sa = (struct sockaddr *) &server->dstaddr; - const struct sockaddr_in *addr = (struct sockaddr_in *) sa; - const struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) sa; - struct cifs_server_key key; - uint16_t key_len = sizeof(key.hdr); - - memset(&key, 0, sizeof(key)); - - /* - * Should not be a problem as sin_family/sin6_family overlays - * sa_family field - */ - key.hdr.family = sa->sa_family; - switch (sa->sa_family) { - case AF_INET: - key.hdr.port = addr->sin_port; - key.ipv4_addr = addr->sin_addr; - key_len += sizeof(key.ipv4_addr); - break; - - case AF_INET6: - key.hdr.port = addr6->sin6_port; - key.ipv6_addr = addr6->sin6_addr; - key_len += sizeof(key.ipv6_addr); - break; - - default: - cifs_dbg(VFS, "Unknown network family '%d'\n", sa->sa_family); - server->fscache = NULL; - return; - } - - server->fscache = - fscache_acquire_cookie(cifs_fscache_netfs.primary_index, - &cifs_fscache_server_index_def, - &key, key_len, - NULL, 0, - server, 0, true); - cifs_dbg(FYI, "%s: (0x%p/0x%p)\n", - __func__, server, server->fscache); -} - -void cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) -{ - cifs_dbg(FYI, "%s: (0x%p/0x%p)\n", - __func__, server, server->fscache); - fscache_relinquish_cookie(server->fscache, NULL, false); - server->fscache = NULL; -} - -void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) -{ - struct TCP_Server_Info *server = tcon->ses->server; - char *sharename; - - sharename = extract_sharename(tcon->treeName); - if (IS_ERR(sharename)) { - cifs_dbg(FYI, "%s: couldn't extract sharename\n", __func__); - tcon->fscache = NULL; - return; - } - - tcon->fscache = - fscache_acquire_cookie(server->fscache, - &cifs_fscache_super_index_def, - sharename, strlen(sharename), - &tcon->resource_id, sizeof(tcon->resource_id), - tcon, 0, true); - kfree(sharename); - cifs_dbg(FYI, "%s: (0x%p/0x%p)\n", - __func__, server->fscache, tcon->fscache); -} - -void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) -{ - cifs_dbg(FYI, "%s: (0x%p)\n", __func__, tcon->fscache); - fscache_relinquish_cookie(tcon->fscache, &tcon->resource_id, false); - tcon->fscache = NULL; -} - -static void cifs_fscache_acquire_inode_cookie(struct cifsInodeInfo *cifsi, - struct cifs_tcon *tcon) -{ - struct cifs_fscache_inode_auxdata auxdata; - - memset(&auxdata, 0, sizeof(auxdata)); - auxdata.eof = cifsi->server_eof; - auxdata.last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec; - auxdata.last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec; - auxdata.last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec; - auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec; - - cifsi->fscache = - fscache_acquire_cookie(tcon->fscache, - &cifs_fscache_inode_object_def, - &cifsi->uniqueid, sizeof(cifsi->uniqueid), - &auxdata, sizeof(auxdata), - cifsi, cifsi->vfs_inode.i_size, true); -} - -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)) - return; - - cifs_fscache_acquire_inode_cookie(cifsi, tcon); - - cifs_dbg(FYI, "%s: got FH cookie (0x%p/0x%p)\n", - __func__, tcon->fscache, cifsi->fscache); -} - -void cifs_fscache_release_inode_cookie(struct inode *inode) -{ - struct cifs_fscache_inode_auxdata auxdata; - struct cifsInodeInfo *cifsi = CIFS_I(inode); - - if (cifsi->fscache) { - memset(&auxdata, 0, sizeof(auxdata)); - auxdata.eof = cifsi->server_eof; - auxdata.last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec; - auxdata.last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec; - auxdata.last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec; - auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec; - - cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache); - fscache_relinquish_cookie(cifsi->fscache, &auxdata, false); - cifsi->fscache = NULL; - } -} - -static void cifs_fscache_disable_inode_cookie(struct inode *inode) -{ - struct cifsInodeInfo *cifsi = CIFS_I(inode); - - if (cifsi->fscache) { - cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache); - fscache_uncache_all_inode_pages(cifsi->fscache, inode); - fscache_relinquish_cookie(cifsi->fscache, NULL, true); - 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 cifs_tcon *tcon = cifs_sb_master_tcon(cifs_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, NULL, true); - - cifs_fscache_acquire_inode_cookie(cifsi, tcon); - cifs_dbg(FYI, "%s: new cookie 0x%p oldcookie 0x%p\n", - __func__, 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); - - cifs_dbg(FYI, "%s: (0x%p/0x%p)\n", - __func__, 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) -{ - cifs_dbg(FYI, "%s: (0x%p/%d)\n", __func__, 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; - - cifs_dbg(FYI, "%s: (fsc:%p, p:%p, i:0x%p\n", - __func__, 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 */ - cifs_dbg(FYI, "%s: submitted\n", __func__); - return ret; - case -ENOBUFS: /* page won't be cached */ - case -ENODATA: /* page not in cache */ - cifs_dbg(FYI, "%s: %d\n", __func__, ret); - return 1; - - default: - cifs_dbg(VFS, "unknown error ret = %d\n", 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; - - cifs_dbg(FYI, "%s: (0x%p/%u/0x%p)\n", - __func__, 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 */ - cifs_dbg(FYI, "%s: submitted\n", __func__); - return ret; - - case -ENOBUFS: /* some pages are not cached and can't be */ - case -ENODATA: /* some pages are not cached */ - cifs_dbg(FYI, "%s: no page\n", __func__); - return 1; - - default: - cifs_dbg(FYI, "unknown error ret = %d\n", ret); - } - - return ret; -} - -void __cifs_readpage_to_fscache(struct inode *inode, struct page *page) -{ - struct cifsInodeInfo *cifsi = CIFS_I(inode); - int ret; - - cifs_dbg(FYI, "%s: (fsc: %p, p: %p, i: %p)\n", - __func__, cifsi->fscache, page, inode); - ret = fscache_write_page(cifsi->fscache, page, - cifsi->vfs_inode.i_size, GFP_KERNEL); - if (ret != 0) - fscache_uncache_page(cifsi->fscache, page); -} - -void __cifs_fscache_readpages_cancel(struct inode *inode, struct list_head *pages) -{ - cifs_dbg(FYI, "%s: (fsc: %p, i: %p)\n", - __func__, CIFS_I(inode)->fscache, inode); - fscache_readpages_cancel(CIFS_I(inode)->fscache, pages); -} - -void __cifs_fscache_invalidate_page(struct page *page, struct inode *inode) -{ - struct cifsInodeInfo *cifsi = CIFS_I(inode); - struct fscache_cookie *cookie = cifsi->fscache; - - cifs_dbg(FYI, "%s: (0x%p/0x%p)\n", __func__, page, cookie); - fscache_wait_on_page_write(cookie, page); - fscache_uncache_page(cookie, page); -} |