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 "orangefs-kernel.h"
14 /* Returns 1 if dentry can still be trusted, else 0. */
15 static int orangefs_revalidate_lookup(struct dentry *dentry)
17 struct dentry *parent_dentry = dget_parent(dentry);
18 struct inode *parent_inode = parent_dentry->d_inode;
19 struct orangefs_inode_s *parent = ORANGEFS_I(parent_inode);
20 struct inode *inode = dentry->d_inode;
21 struct orangefs_kernel_op_s *new_op;
25 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: attempting lookup.\n", __func__);
27 new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP);
31 new_op->upcall.req.lookup.sym_follow = ORANGEFS_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, "orangefs_lookup",
45 get_interruptible_flag(parent_inode));
47 /* Positive dentry: reject if error or not the same inode. */
50 gossip_debug(GOSSIP_DCACHE_DEBUG,
51 "%s:%s:%d lookup failure.\n",
52 __FILE__, __func__, __LINE__);
55 if (!match_handle(new_op->downcall.resp.lookup.refn.khandle,
57 gossip_debug(GOSSIP_DCACHE_DEBUG,
58 "%s:%s:%d no match.\n",
59 __FILE__, __func__, __LINE__);
63 /* Negative dentry: reject if success or error other than ENOENT. */
65 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: negative dentry.\n",
67 if (!err || err != -ENOENT) {
68 if (new_op->downcall.status != 0)
69 gossip_debug(GOSSIP_DCACHE_DEBUG,
70 "%s:%s:%d lookup failure.\n",
71 __FILE__, __func__, __LINE__);
76 dentry->d_time = jiffies + dcache_timeout_msecs*HZ/1000;
84 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d revalidate failed\n",
85 __FILE__, __func__, __LINE__);
90 * Verify that dentry is valid.
92 * Should return 1 if dentry can still be trusted, else 0.
94 static int orangefs_d_revalidate(struct dentry *dentry, unsigned int flags)
98 if (time_before(jiffies, dentry->d_time))
101 if (flags & LOOKUP_RCU)
104 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: called on dentry %p.\n",
107 /* skip root handle lookups. */
108 if (dentry->d_inode && is_root_handle(dentry->d_inode))
112 * If this passes, the positive dentry still exists or the negative
113 * dentry still does not exist.
115 if (!orangefs_revalidate_lookup(dentry))
118 /* We do not need to continue with negative dentries. */
119 if (!dentry->d_inode)
122 /* Now we must perform a getattr to validate the inode contents. */
124 ret = orangefs_inode_check_changed(dentry->d_inode);
126 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d getattr failure.\n",
127 __FILE__, __func__, __LINE__);
134 gossip_debug(GOSSIP_DCACHE_DEBUG,
135 "%s: negative dentry or positive dentry and inode valid.\n",
140 const struct dentry_operations orangefs_dentry_operations = {
141 .d_revalidate = orangefs_d_revalidate,