Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
5db11c21 MM |
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" | |
575e9461 | 13 | #include "orangefs-kernel.h" |
5db11c21 MM |
14 | |
15 | /* Returns 1 if dentry can still be trusted, else 0. */ | |
8bb8aefd | 16 | static int orangefs_revalidate_lookup(struct dentry *dentry) |
5db11c21 MM |
17 | { |
18 | struct dentry *parent_dentry = dget_parent(dentry); | |
19 | struct inode *parent_inode = parent_dentry->d_inode; | |
8bb8aefd | 20 | struct orangefs_inode_s *parent = ORANGEFS_I(parent_inode); |
5db11c21 | 21 | struct inode *inode = dentry->d_inode; |
8bb8aefd | 22 | struct orangefs_kernel_op_s *new_op; |
5db11c21 MM |
23 | int ret = 0; |
24 | int err = 0; | |
25 | ||
26 | gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: attempting lookup.\n", __func__); | |
27 | ||
8bb8aefd | 28 | new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP); |
4c2b46c8 JJB |
29 | if (!new_op) { |
30 | ret = -ENOMEM; | |
5db11c21 | 31 | goto out_put_parent; |
4c2b46c8 | 32 | } |
5db11c21 | 33 | |
8bb8aefd | 34 | new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW; |
5db11c21 MM |
35 | new_op->upcall.req.lookup.parent_refn = parent->refn; |
36 | strncpy(new_op->upcall.req.lookup.d_name, | |
37 | dentry->d_name.name, | |
6bdfb48d | 38 | ORANGEFS_NAME_MAX - 1); |
5db11c21 MM |
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 | ||
8bb8aefd | 47 | err = service_operation(new_op, "orangefs_lookup", |
5db11c21 | 48 | get_interruptible_flag(parent_inode)); |
99109822 MB |
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 | } | |
5db11c21 MM |
77 | } |
78 | ||
804b1737 | 79 | orangefs_set_timeout(dentry); |
5db11c21 MM |
80 | ret = 1; |
81 | out_release_op: | |
82 | op_release(new_op); | |
83 | out_put_parent: | |
84 | dput(parent_dentry); | |
85 | return ret; | |
86 | out_drop: | |
99109822 MB |
87 | gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d revalidate failed\n", |
88 | __FILE__, __func__, __LINE__); | |
5db11c21 MM |
89 | goto out_release_op; |
90 | } | |
91 | ||
92 | /* | |
93 | * Verify that dentry is valid. | |
94 | * | |
f987f4c2 | 95 | * Should return 1 if dentry can still be trusted, else 0. |
5db11c21 | 96 | */ |
8bb8aefd | 97 | static int orangefs_d_revalidate(struct dentry *dentry, unsigned int flags) |
5db11c21 | 98 | { |
99109822 | 99 | int ret; |
804b1737 | 100 | unsigned long time = (unsigned long) dentry->d_fsdata; |
5db11c21 | 101 | |
804b1737 | 102 | if (time_before(jiffies, time)) |
31b7c1ab MB |
103 | return 1; |
104 | ||
5db11c21 MM |
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 | ||
99109822 MB |
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 | */ | |
ee70fca0 | 119 | if (!orangefs_revalidate_lookup(dentry)) |
99109822 | 120 | return 0; |
5db11c21 | 121 | |
99109822 | 122 | /* We do not need to continue with negative dentries. */ |
74e938c2 MB |
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 | } | |
5db11c21 | 129 | |
99109822 | 130 | /* Now we must perform a getattr to validate the inode contents. */ |
933287da | 131 | |
5859d77e | 132 | ret = orangefs_inode_check_changed(dentry->d_inode); |
99109822 MB |
133 | if (ret < 0) { |
134 | gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d getattr failure.\n", | |
135 | __FILE__, __func__, __LINE__); | |
99109822 MB |
136 | return 0; |
137 | } | |
74e938c2 | 138 | return !ret; |
5db11c21 MM |
139 | } |
140 | ||
8bb8aefd YL |
141 | const struct dentry_operations orangefs_dentry_operations = { |
142 | .d_revalidate = orangefs_d_revalidate, | |
5db11c21 | 143 | }; |