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fs/cifs/fscache.c
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/* * fs/cifs/fscache.c - CIFS filesystem cache interface * * Copyright (c) 2010 Novell, Inc. |
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* Author(s): Suresh Jayaraman <sjayaraman@suse.de> |
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* * 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" |
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#include "cifs_fs_sb.h" |
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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); |
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cFYI(1, "%s: (0x%p/0x%p)", __func__, server, server->fscache); |
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} void cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) { |
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cFYI(1, "%s: (0x%p/0x%p)", __func__, server, server->fscache); |
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fscache_relinquish_cookie(server->fscache, 0); server->fscache = NULL; } |
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void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) |
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{ struct TCP_Server_Info *server = tcon->ses->server; tcon->fscache = fscache_acquire_cookie(server->fscache, &cifs_fscache_super_index_def, tcon); |
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cFYI(1, "%s: (0x%p/0x%p)", __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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cFYI(1, "%s: (0x%p)", __func__, tcon->fscache); |
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fscache_relinquish_cookie(tcon->fscache, 0); tcon->fscache = NULL; } |
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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); |
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struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
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if (cifsi->fscache) return; |
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE) { cifsi->fscache = fscache_acquire_cookie(tcon->fscache, |
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&cifs_fscache_inode_object_def, cifsi); |
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cFYI(1, "%s: got FH cookie (0x%p/0x%p)", __func__, tcon->fscache, cifsi->fscache); |
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} |
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} void cifs_fscache_release_inode_cookie(struct inode *inode) { struct cifsInodeInfo *cifsi = CIFS_I(inode); if (cifsi->fscache) { |
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cFYI(1, "%s: (0x%p)", __func__, cifsi->fscache); |
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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) { |
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cFYI(1, "%s: (0x%p)", __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); 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); |
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else |
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cifs_fscache_enable_inode_cookie(inode); |
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} 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); |
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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, cifsi); |
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cFYI(1, "%s: new cookie 0x%p oldcookie 0x%p", __func__, cifsi->fscache, old); |
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} } |
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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); |
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cFYI(1, "%s: (0x%p/0x%p)", __func__, page, cifsi->fscache); |
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if (!fscache_maybe_release_page(cifsi->fscache, page, gfp)) return 0; } return 1; } |
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static void cifs_readpage_from_fscache_complete(struct page *page, void *ctx, int error) { |
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cFYI(1, "%s: (0x%p/%d)", __func__, page, error); |
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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; |
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cFYI(1, "%s: (fsc:%p, p:%p, i:0x%p", __func__, |
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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 */ |
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cFYI(1, "%s: submitted", __func__); |
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return ret; case -ENOBUFS: /* page won't be cached */ case -ENODATA: /* page not in cache */ |
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cFYI(1, "%s: %d", __func__, ret); |
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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; |
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cFYI(1, "%s: (0x%p/%u/0x%p)", __func__, |
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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 */ |
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cFYI(1, "%s: submitted", __func__); |
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return ret; case -ENOBUFS: /* some pages are not cached and can't be */ case -ENODATA: /* some pages are not cached */ |
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cFYI(1, "%s: no page", __func__); |
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return 1; default: cFYI(1, "unknown error ret = %d", ret); } return ret; } |
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void __cifs_readpage_to_fscache(struct inode *inode, struct page *page) { int ret; |
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cFYI(1, "%s: (fsc: %p, p: %p, i: %p)", __func__, |
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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); } |
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void __cifs_fscache_invalidate_page(struct page *page, struct inode *inode) { struct cifsInodeInfo *cifsi = CIFS_I(inode); struct fscache_cookie *cookie = cifsi->fscache; |
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cFYI(1, "%s: (0x%p/0x%p)", __func__, page, cookie); |
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fscache_wait_on_page_write(cookie, page); fscache_uncache_page(cookie, page); } |