diff options
Diffstat (limited to 'kernel/fs/9p/vfs_dentry.c')
| -rw-r--r-- | kernel/fs/9p/vfs_dentry.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/kernel/fs/9p/vfs_dentry.c b/kernel/fs/9p/vfs_dentry.c new file mode 100644 index 000000000..bd456c668 --- /dev/null +++ b/kernel/fs/9p/vfs_dentry.c @@ -0,0 +1,122 @@ +/* + * linux/fs/9p/vfs_dentry.c + * + * This file contians vfs dentry ops for the 9P2000 protocol. + * + * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> + * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to: + * Free Software Foundation + * 51 Franklin Street, Fifth Floor + * Boston, MA 02111-1301 USA + * + */ + +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/fs.h> +#include <linux/file.h> +#include <linux/pagemap.h> +#include <linux/stat.h> +#include <linux/string.h> +#include <linux/inet.h> +#include <linux/namei.h> +#include <linux/idr.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <net/9p/9p.h> +#include <net/9p/client.h> + +#include "v9fs.h" +#include "v9fs_vfs.h" +#include "fid.h" + +/** + * v9fs_cached_dentry_delete - called when dentry refcount equals 0 + * @dentry: dentry in question + * + */ +static int v9fs_cached_dentry_delete(const struct dentry *dentry) +{ + p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n", + dentry, dentry); + + /* Don't cache negative dentries */ + if (d_really_is_negative(dentry)) + return 1; + return 0; +} + +/** + * v9fs_dentry_release - called when dentry is going to be freed + * @dentry: dentry that is being release + * + */ + +static void v9fs_dentry_release(struct dentry *dentry) +{ + struct hlist_node *p, *n; + p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n", + dentry, dentry); + hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata) + p9_client_clunk(hlist_entry(p, struct p9_fid, dlist)); + dentry->d_fsdata = NULL; +} + +static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags) +{ + struct p9_fid *fid; + struct inode *inode; + struct v9fs_inode *v9inode; + + if (flags & LOOKUP_RCU) + return -ECHILD; + + inode = d_inode(dentry); + if (!inode) + goto out_valid; + + v9inode = V9FS_I(inode); + if (v9inode->cache_validity & V9FS_INO_INVALID_ATTR) { + int retval; + struct v9fs_session_info *v9ses; + fid = v9fs_fid_lookup(dentry); + if (IS_ERR(fid)) + return PTR_ERR(fid); + + v9ses = v9fs_inode2v9ses(inode); + if (v9fs_proto_dotl(v9ses)) + retval = v9fs_refresh_inode_dotl(fid, inode); + else + retval = v9fs_refresh_inode(fid, inode); + if (retval == -ENOENT) + return 0; + if (retval < 0) + return retval; + } +out_valid: + return 1; +} + +const struct dentry_operations v9fs_cached_dentry_operations = { + .d_revalidate = v9fs_lookup_revalidate, + .d_weak_revalidate = v9fs_lookup_revalidate, + .d_delete = v9fs_cached_dentry_delete, + .d_release = v9fs_dentry_release, +}; + +const struct dentry_operations v9fs_dentry_operations = { + .d_delete = always_delete_dentry, + .d_release = v9fs_dentry_release, +}; |