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fs/9p/vfs_dentry.c
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/* * 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 |
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* it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. |
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* * 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> |
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#include <linux/inet.h> #include <linux/namei.h> #include <linux/idr.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <net/9p/9p.h> #include <net/9p/client.h> |
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#include "v9fs.h" |
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#include "v9fs_vfs.h" |
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#include "fid.h" /** |
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* v9fs_cached_dentry_delete - called when dentry refcount equals 0 * @dentry: dentry in question * |
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*/ |
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static int v9fs_cached_dentry_delete(const struct dentry *dentry) |
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{ |
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p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p) ", dentry, dentry); |
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/* Don't cache negative dentries */ |
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if (d_really_is_negative(dentry)) |
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return 1; |
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return 0; } /** |
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* v9fs_dentry_release - called when dentry is going to be freed * @dentry: dentry that is being release * */ |
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static void v9fs_dentry_release(struct dentry *dentry) |
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{ |
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struct hlist_node *p, *n; |
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p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p) ", dentry, dentry); |
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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; |
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} |
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static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
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{ struct p9_fid *fid; struct inode *inode; struct v9fs_inode *v9inode; |
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if (flags & LOOKUP_RCU) |
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return -ECHILD; |
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inode = d_inode(dentry); |
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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); |
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if (retval == -ENOENT) return 0; if (retval < 0) |
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return retval; } out_valid: return 1; } |
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const struct dentry_operations v9fs_cached_dentry_operations = { |
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.d_revalidate = v9fs_lookup_revalidate, |
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.d_weak_revalidate = v9fs_lookup_revalidate, |
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.d_delete = v9fs_cached_dentry_delete, .d_release = v9fs_dentry_release, }; |
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const struct dentry_operations v9fs_dentry_operations = { |
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.d_delete = always_delete_dentry, |
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.d_release = v9fs_dentry_release, }; |