[Feature] add GA346 baseline version
Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/kernel/linux/v4.19/fs/cifs/fscache.c b/src/kernel/linux/v4.19/fs/cifs/fscache.c
new file mode 100644
index 0000000..ea6ace9
--- /dev/null
+++ b/src/kernel/linux/v4.19/fs/cifs/fscache.c
@@ -0,0 +1,334 @@
+/*
+ * 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);
+}