2 * (C) 2001 Clemson University and The University of Chicago
4 * See COPYING in top-level directory.
8 * Implementation of dentry (directory cache) functions.
12 #include "pvfs2-kernel.h"
14 /* Returns 1 if dentry can still be trusted, else 0. */
15 static int pvfs2_revalidate_lookup(struct dentry *dentry)
17 struct dentry *parent_dentry = dget_parent(dentry);
18 struct inode *parent_inode = parent_dentry->d_inode;
19 struct pvfs2_inode_s *parent = PVFS2_I(parent_inode);
20 struct inode *inode = dentry->d_inode;
21 struct pvfs2_kernel_op_s *new_op;
25 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: attempting lookup.\n", __func__);
27 new_op = op_alloc(PVFS2_VFS_OP_LOOKUP);
31 new_op->upcall.req.lookup.sym_follow = PVFS2_LOOKUP_LINK_NO_FOLLOW;
32 new_op->upcall.req.lookup.parent_refn = parent->refn;
33 strncpy(new_op->upcall.req.lookup.d_name,
37 gossip_debug(GOSSIP_DCACHE_DEBUG,
38 "%s:%s:%d interrupt flag [%d]\n",
42 get_interruptible_flag(parent_inode));
44 err = service_operation(new_op, "pvfs2_lookup",
45 get_interruptible_flag(parent_inode));
49 if (new_op->downcall.status != 0 ||
50 !match_handle(new_op->downcall.resp.lookup.refn.khandle, inode)) {
51 gossip_debug(GOSSIP_DCACHE_DEBUG,
53 "lookup failure |%s| or no match |%s|.\n",
57 new_op->downcall.status ? "true" : "false",
58 match_handle(new_op->downcall.resp.lookup.refn.khandle,
59 inode) ? "false" : "true");
60 gossip_debug(GOSSIP_DCACHE_DEBUG,
61 "%s:%s:%d revalidate failed\n",
62 __FILE__, __func__, __LINE__);
78 * Verify that dentry is valid.
80 * Should return 1 if dentry can still be trusted, else 0
82 static int pvfs2_d_revalidate(struct dentry *dentry, unsigned int flags)
87 if (flags & LOOKUP_RCU)
90 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: called on dentry %p.\n",
93 /* find inode from dentry */
94 if (!dentry->d_inode) {
95 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: negative dentry.\n",
100 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: inode valid.\n", __func__);
101 inode = dentry->d_inode;
104 * first perform a lookup to make sure that the object not only
105 * exists, but is still in the expected place in the name space
107 if (!is_root_handle(inode)) {
108 if (!pvfs2_revalidate_lookup(dentry))
111 gossip_debug(GOSSIP_DCACHE_DEBUG,
112 "%s: root handle, lookup skipped.\n",
116 /* now perform getattr */
117 gossip_debug(GOSSIP_DCACHE_DEBUG,
118 "%s: doing getattr: inode: %p, handle: %pU\n",
121 get_khandle_from_ino(inode));
122 ret = pvfs2_inode_getattr(inode, PVFS_ATTR_SYS_ALL_NOHINT);
123 gossip_debug(GOSSIP_DCACHE_DEBUG,
124 "%s: getattr %s (ret = %d), returning %s for dentry i_count=%d\n",
126 (ret == 0 ? "succeeded" : "failed"),
128 (ret == 0 ? "valid" : "INVALID"),
129 atomic_read(&inode->i_count));
133 /* dentry is valid! */
140 const struct dentry_operations pvfs2_dentry_operations = {
141 .d_revalidate = pvfs2_d_revalidate,