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107 lines
2.5 KiB
107 lines
2.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/fs/9p/vfs_dentry.c |
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* |
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* This file contians vfs dentry ops for the 9P2000 protocol. |
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* |
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* Copyright (C) 2004 by Eric Van Hensbergen <[email protected]> |
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* Copyright (C) 2002 by Ron Minnich <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/errno.h> |
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#include <linux/fs.h> |
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#include <linux/file.h> |
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#include <linux/pagemap.h> |
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#include <linux/stat.h> |
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#include <linux/string.h> |
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#include <linux/inet.h> |
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#include <linux/namei.h> |
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#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> |
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#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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/** |
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* v9fs_cached_dentry_delete - called when dentry refcount equals 0 |
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* @dentry: dentry in question |
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* |
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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)\n", |
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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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} |
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/** |
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* v9fs_dentry_release - called when dentry is going to be freed |
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* @dentry: dentry that is being release |
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* |
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*/ |
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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)\n", |
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dentry, dentry); |
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hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata) |
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p9_client_clunk(hlist_entry(p, struct p9_fid, dlist)); |
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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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{ |
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struct p9_fid *fid; |
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struct inode *inode; |
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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) |
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goto out_valid; |
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v9inode = V9FS_I(inode); |
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if (v9inode->cache_validity & V9FS_INO_INVALID_ATTR) { |
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int retval; |
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struct v9fs_session_info *v9ses; |
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fid = v9fs_fid_lookup(dentry); |
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if (IS_ERR(fid)) |
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return PTR_ERR(fid); |
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v9ses = v9fs_inode2v9ses(inode); |
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if (v9fs_proto_dotl(v9ses)) |
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retval = v9fs_refresh_inode_dotl(fid, inode); |
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else |
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retval = v9fs_refresh_inode(fid, inode); |
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if (retval == -ENOENT) |
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return 0; |
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if (retval < 0) |
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return retval; |
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} |
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out_valid: |
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return 1; |
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} |
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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, |
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.d_release = v9fs_dentry_release, |
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}; |
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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, |
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};
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