/* * 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 = cifsi->vfs_inode.i_mtime; auxdata.last_change_time = cifsi->vfs_inode.i_ctime; 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 = cifsi->vfs_inode.i_mtime; auxdata.last_change_time = cifsi->vfs_inode.i_ctime; 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); }