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1/*
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"
12#include "orangefs-kernel.h"
13
14/* Returns 1 if dentry can still be trusted, else 0. */
15static int orangefs_revalidate_lookup(struct dentry *dentry)
16{
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;
22 int ret = 0;
23 int err = 0;
24
25 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: attempting lookup.\n", __func__);
26
27 new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP);
28 if (!new_op)
29 goto out_put_parent;
30
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,
34 dentry->d_name.name,
35 ORANGEFS_NAME_MAX);
36
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
44 err = service_operation(new_op, "orangefs_lookup",
45 get_interruptible_flag(parent_inode));
46
47 /* 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 }
74 }
75
76 ret = 1;
77out_release_op:
78 op_release(new_op);
79out_put_parent:
80 dput(parent_dentry);
81 return ret;
82out_drop:
83 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d revalidate failed\n",
84 __FILE__, __func__, __LINE__);
85 goto out_release_op;
86}
87
88/*
89 * Verify that dentry is valid.
90 *
91 * Should return 1 if dentry can still be trusted, else 0.
92 */
93static int orangefs_d_revalidate(struct dentry *dentry, unsigned int flags)
94{
95 int ret;
96
97 if (flags & LOOKUP_RCU)
98 return -ECHILD;
99
100 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: called on dentry %p.\n",
101 __func__, dentry);
102
103 /* skip root handle lookups. */
104 if (dentry->d_inode && is_root_handle(dentry->d_inode))
105 return 1;
106
107 /*
108 * If this passes, the positive dentry still exists or the negative
109 * dentry still does not exist.
110 */
111 if (!orangefs_revalidate_lookup(dentry))
112 return 0;
113
114 /* We do not need to continue with negative dentries. */
115 if (!dentry->d_inode)
116 goto out;
117
118 /* Now we must perform a getattr to validate the inode contents. */
119
120 ret = orangefs_inode_check_changed(dentry->d_inode);
121 if (ret < 0) {
122 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d getattr failure.\n",
123 __FILE__, __func__, __LINE__);
124 return 0;
125 }
126 if (ret == 0)
127 return 0;
128
129out:
130 gossip_debug(GOSSIP_DCACHE_DEBUG,
131 "%s: negative dentry or positive dentry and inode valid.\n",
132 __func__);
133 return 1;
134}
135
136const struct dentry_operations orangefs_dentry_operations = {
137 .d_revalidate = orangefs_d_revalidate,
138};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * (C) 2001 Clemson University and The University of Chicago
4 *
5 * See COPYING in top-level directory.
6 */
7
8/*
9 * Implementation of dentry (directory cache) functions.
10 */
11
12#include "protocol.h"
13#include "orangefs-kernel.h"
14
15/* Returns 1 if dentry can still be trusted, else 0. */
16static int orangefs_revalidate_lookup(struct dentry *dentry)
17{
18 struct dentry *parent_dentry = dget_parent(dentry);
19 struct inode *parent_inode = parent_dentry->d_inode;
20 struct orangefs_inode_s *parent = ORANGEFS_I(parent_inode);
21 struct inode *inode = dentry->d_inode;
22 struct orangefs_kernel_op_s *new_op;
23 int ret = 0;
24 int err = 0;
25
26 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: attempting lookup.\n", __func__);
27
28 new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP);
29 if (!new_op) {
30 ret = -ENOMEM;
31 goto out_put_parent;
32 }
33
34 new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW;
35 new_op->upcall.req.lookup.parent_refn = parent->refn;
36 strncpy(new_op->upcall.req.lookup.d_name,
37 dentry->d_name.name,
38 ORANGEFS_NAME_MAX - 1);
39
40 gossip_debug(GOSSIP_DCACHE_DEBUG,
41 "%s:%s:%d interrupt flag [%d]\n",
42 __FILE__,
43 __func__,
44 __LINE__,
45 get_interruptible_flag(parent_inode));
46
47 err = service_operation(new_op, "orangefs_lookup",
48 get_interruptible_flag(parent_inode));
49
50 /* Positive dentry: reject if error or not the same inode. */
51 if (inode) {
52 if (err) {
53 gossip_debug(GOSSIP_DCACHE_DEBUG,
54 "%s:%s:%d lookup failure.\n",
55 __FILE__, __func__, __LINE__);
56 goto out_drop;
57 }
58 if (!match_handle(new_op->downcall.resp.lookup.refn.khandle,
59 inode)) {
60 gossip_debug(GOSSIP_DCACHE_DEBUG,
61 "%s:%s:%d no match.\n",
62 __FILE__, __func__, __LINE__);
63 goto out_drop;
64 }
65
66 /* Negative dentry: reject if success or error other than ENOENT. */
67 } else {
68 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: negative dentry.\n",
69 __func__);
70 if (!err || err != -ENOENT) {
71 if (new_op->downcall.status != 0)
72 gossip_debug(GOSSIP_DCACHE_DEBUG,
73 "%s:%s:%d lookup failure.\n",
74 __FILE__, __func__, __LINE__);
75 goto out_drop;
76 }
77 }
78
79 orangefs_set_timeout(dentry);
80 ret = 1;
81out_release_op:
82 op_release(new_op);
83out_put_parent:
84 dput(parent_dentry);
85 return ret;
86out_drop:
87 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d revalidate failed\n",
88 __FILE__, __func__, __LINE__);
89 goto out_release_op;
90}
91
92/*
93 * Verify that dentry is valid.
94 *
95 * Should return 1 if dentry can still be trusted, else 0.
96 */
97static int orangefs_d_revalidate(struct dentry *dentry, unsigned int flags)
98{
99 int ret;
100 unsigned long time = (unsigned long) dentry->d_fsdata;
101
102 if (time_before(jiffies, time))
103 return 1;
104
105 if (flags & LOOKUP_RCU)
106 return -ECHILD;
107
108 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: called on dentry %p.\n",
109 __func__, dentry);
110
111 /* skip root handle lookups. */
112 if (dentry->d_inode && is_root_handle(dentry->d_inode))
113 return 1;
114
115 /*
116 * If this passes, the positive dentry still exists or the negative
117 * dentry still does not exist.
118 */
119 if (!orangefs_revalidate_lookup(dentry))
120 return 0;
121
122 /* We do not need to continue with negative dentries. */
123 if (!dentry->d_inode) {
124 gossip_debug(GOSSIP_DCACHE_DEBUG,
125 "%s: negative dentry or positive dentry and inode valid.\n",
126 __func__);
127 return 1;
128 }
129
130 /* Now we must perform a getattr to validate the inode contents. */
131
132 ret = orangefs_inode_check_changed(dentry->d_inode);
133 if (ret < 0) {
134 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d getattr failure.\n",
135 __FILE__, __func__, __LINE__);
136 return 0;
137 }
138 return !ret;
139}
140
141const struct dentry_operations orangefs_dentry_operations = {
142 .d_revalidate = orangefs_d_revalidate,
143};