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);
33 new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW;
34 new_op->upcall.req.lookup.parent_refn = parent->refn;
35 strncpy(new_op->upcall.req.lookup.d_name,
39 gossip_debug(GOSSIP_DCACHE_DEBUG,
40 "%s:%s:%d interrupt flag [%d]\n",
44 get_interruptible_flag(parent_inode));
46 err = service_operation(new_op, "orangefs_lookup",
47 get_interruptible_flag(parent_inode));
49 /* Positive dentry: reject if error or not the same inode. */
52 gossip_debug(GOSSIP_DCACHE_DEBUG,
53 "%s:%s:%d lookup failure.\n",
54 __FILE__, __func__, __LINE__);
57 if (!match_handle(new_op->downcall.resp.lookup.refn.khandle,
59 gossip_debug(GOSSIP_DCACHE_DEBUG,
60 "%s:%s:%d no match.\n",
61 __FILE__, __func__, __LINE__);
65 /* Negative dentry: reject if success or error other than ENOENT. */
67 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: negative dentry.\n",
69 if (!err || err != -ENOENT) {
70 if (new_op->downcall.status != 0)
71 gossip_debug(GOSSIP_DCACHE_DEBUG,
72 "%s:%s:%d lookup failure.\n",
73 __FILE__, __func__, __LINE__);
78 orangefs_set_timeout(dentry);
86 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d revalidate failed\n",
87 __FILE__, __func__, __LINE__);
92 * Verify that dentry is valid.
94 * Should return 1 if dentry can still be trusted, else 0.
96 static int orangefs_d_revalidate(struct dentry *dentry, unsigned int flags)
99 unsigned long time = (unsigned long) dentry->d_fsdata;
101 if (time_before(jiffies, time))
104 if (flags & LOOKUP_RCU)
107 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: called on dentry %p.\n",
110 /* skip root handle lookups. */
111 if (dentry->d_inode && is_root_handle(dentry->d_inode))
115 * If this passes, the positive dentry still exists or the negative
116 * dentry still does not exist.
118 if (!orangefs_revalidate_lookup(dentry))
121 /* We do not need to continue with negative dentries. */
122 if (!dentry->d_inode)
125 /* Now we must perform a getattr to validate the inode contents. */
127 ret = orangefs_inode_check_changed(dentry->d_inode);
129 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d getattr failure.\n",
130 __FILE__, __func__, __LINE__);
137 gossip_debug(GOSSIP_DCACHE_DEBUG,
138 "%s: negative dentry or positive dentry and inode valid.\n",
143 const struct dentry_operations orangefs_dentry_operations = {
144 .d_revalidate = orangefs_d_revalidate,