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Mike Marshall5db11c22015-07-17 10:38:12 -04001/*
2 * (C) 2001 Clemson University and The University of Chicago
3 *
4 * See COPYING in top-level directory.
5 */
6
7/*
8 * Implementation of dentry (directory cache) functions.
9 */
10
11#include "protocol.h"
Mike Marshall575e9462015-12-04 12:56:14 -050012#include "orangefs-kernel.h"
Mike Marshall5db11c22015-07-17 10:38:12 -040013
14/* Returns 1 if dentry can still be trusted, else 0. */
Yi Liu8bb8aef2015-11-24 15:12:14 -050015static int orangefs_revalidate_lookup(struct dentry *dentry)
Mike Marshall5db11c22015-07-17 10:38:12 -040016{
17 struct dentry *parent_dentry = dget_parent(dentry);
18 struct inode *parent_inode = parent_dentry->d_inode;
Yi Liu8bb8aef2015-11-24 15:12:14 -050019 struct orangefs_inode_s *parent = ORANGEFS_I(parent_inode);
Mike Marshall5db11c22015-07-17 10:38:12 -040020 struct inode *inode = dentry->d_inode;
Yi Liu8bb8aef2015-11-24 15:12:14 -050021 struct orangefs_kernel_op_s *new_op;
Mike Marshall5db11c22015-07-17 10:38:12 -040022 int ret = 0;
23 int err = 0;
24
25 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: attempting lookup.\n", __func__);
26
Yi Liu8bb8aef2015-11-24 15:12:14 -050027 new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP);
Mike Marshall5db11c22015-07-17 10:38:12 -040028 if (!new_op)
29 goto out_put_parent;
30
Yi Liu8bb8aef2015-11-24 15:12:14 -050031 new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW;
Mike Marshall5db11c22015-07-17 10:38:12 -040032 new_op->upcall.req.lookup.parent_refn = parent->refn;
33 strncpy(new_op->upcall.req.lookup.d_name,
34 dentry->d_name.name,
Yi Liu8bb8aef2015-11-24 15:12:14 -050035 ORANGEFS_NAME_LEN);
Mike Marshall5db11c22015-07-17 10:38:12 -040036
37 gossip_debug(GOSSIP_DCACHE_DEBUG,
38 "%s:%s:%d interrupt flag [%d]\n",
39 __FILE__,
40 __func__,
41 __LINE__,
42 get_interruptible_flag(parent_inode));
43
Yi Liu8bb8aef2015-11-24 15:12:14 -050044 err = service_operation(new_op, "orangefs_lookup",
Mike Marshall5db11c22015-07-17 10:38:12 -040045 get_interruptible_flag(parent_inode));
Mike Marshall5db11c22015-07-17 10:38:12 -040046
Martin Brandenburg99109822016-01-28 10:19:40 -050047 /* Positive dentry: reject if error or not the same inode. */
48 if (inode) {
49 if (err) {
50 gossip_debug(GOSSIP_DCACHE_DEBUG,
51 "%s:%s:%d lookup failure.\n",
52 __FILE__, __func__, __LINE__);
53 goto out_drop;
54 }
55 if (!match_handle(new_op->downcall.resp.lookup.refn.khandle,
56 inode)) {
57 gossip_debug(GOSSIP_DCACHE_DEBUG,
58 "%s:%s:%d no match.\n",
59 __FILE__, __func__, __LINE__);
60 goto out_drop;
61 }
62
63 /* Negative dentry: reject if success or error other than ENOENT. */
64 } else {
65 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: negative dentry.\n",
66 __func__);
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__);
72 goto out_drop;
73 }
Mike Marshall5db11c22015-07-17 10:38:12 -040074 }
75
76 ret = 1;
77out_release_op:
78 op_release(new_op);
79out_put_parent:
80 dput(parent_dentry);
81 return ret;
82out_drop:
Martin Brandenburg99109822016-01-28 10:19:40 -050083 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d revalidate failed\n",
84 __FILE__, __func__, __LINE__);
Mike Marshall5db11c22015-07-17 10:38:12 -040085 d_drop(dentry);
86 goto out_release_op;
87}
88
89/*
90 * Verify that dentry is valid.
91 *
Mike Marshallf987f4c2015-12-30 13:04:28 -050092 * Should return 1 if dentry can still be trusted, else 0.
Mike Marshall5db11c22015-07-17 10:38:12 -040093 */
Yi Liu8bb8aef2015-11-24 15:12:14 -050094static int orangefs_d_revalidate(struct dentry *dentry, unsigned int flags)
Mike Marshall5db11c22015-07-17 10:38:12 -040095{
Martin Brandenburg99109822016-01-28 10:19:40 -050096 int ret;
Mike Marshall5db11c22015-07-17 10:38:12 -040097
98 if (flags & LOOKUP_RCU)
99 return -ECHILD;
100
101 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: called on dentry %p.\n",
102 __func__, dentry);
103
Mike Marshallf987f4c2015-12-30 13:04:28 -0500104 /* skip root handle lookups. */
Martin Brandenburg99109822016-01-28 10:19:40 -0500105 if (dentry->d_inode && is_root_handle(dentry->d_inode))
106 return 1;
107
108 /*
109 * If this passes, the positive dentry still exists or the negative
110 * dentry still does not exist.
111 */
112 if (!orangefs_revalidate_lookup(dentry)) {
113 d_drop(dentry);
114 return 0;
Mike Marshall5db11c22015-07-17 10:38:12 -0400115 }
116
Martin Brandenburg99109822016-01-28 10:19:40 -0500117 /* We do not need to continue with negative dentries. */
118 if (!dentry->d_inode)
119 goto out;
120
121 /* Now we must perform a getattr to validate the inode contents. */
122 ret = orangefs_inode_getattr(dentry->d_inode,
123 ORANGEFS_ATTR_SYS_ALL_NOHINT, 1);
124 if (ret < 0) {
125 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d getattr failure.\n",
126 __FILE__, __func__, __LINE__);
127 d_drop(dentry);
128 return 0;
129 }
130 if (ret == 0) {
131 d_drop(dentry);
132 return 0;
133 }
Mike Marshall5db11c22015-07-17 10:38:12 -0400134
Mike Marshallf987f4c2015-12-30 13:04:28 -0500135out:
Martin Brandenburg99109822016-01-28 10:19:40 -0500136 gossip_debug(GOSSIP_DCACHE_DEBUG,
137 "%s: negative dentry or positive dentry and inode valid.\n",
138 __func__);
139 return 1;
Mike Marshall5db11c22015-07-17 10:38:12 -0400140}
141
Yi Liu8bb8aef2015-11-24 15:12:14 -0500142const struct dentry_operations orangefs_dentry_operations = {
143 .d_revalidate = orangefs_d_revalidate,
Mike Marshall5db11c22015-07-17 10:38:12 -0400144};