Orangefs: don't change EXTRAVERSION
[linux-block.git] / fs / orangefs / dcache.c
CommitLineData
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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"
575e9461 12#include "orangefs-kernel.h"
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13
14/* Returns 1 if dentry can still be trusted, else 0. */
8bb8aefd 15static int orangefs_revalidate_lookup(struct dentry *dentry)
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16{
17 struct dentry *parent_dentry = dget_parent(dentry);
18 struct inode *parent_inode = parent_dentry->d_inode;
8bb8aefd 19 struct orangefs_inode_s *parent = ORANGEFS_I(parent_inode);
5db11c21 20 struct inode *inode = dentry->d_inode;
8bb8aefd 21 struct orangefs_kernel_op_s *new_op;
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22 int ret = 0;
23 int err = 0;
24
25 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: attempting lookup.\n", __func__);
26
8bb8aefd 27 new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP);
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28 if (!new_op)
29 goto out_put_parent;
30
8bb8aefd 31 new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW;
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32 new_op->upcall.req.lookup.parent_refn = parent->refn;
33 strncpy(new_op->upcall.req.lookup.d_name,
34 dentry->d_name.name,
8bb8aefd 35 ORANGEFS_NAME_LEN);
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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
8bb8aefd 44 err = service_operation(new_op, "orangefs_lookup",
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45 get_interruptible_flag(parent_inode));
46 if (err)
47 goto out_drop;
48
49 if (new_op->downcall.status != 0 ||
50 !match_handle(new_op->downcall.resp.lookup.refn.khandle, inode)) {
51 gossip_debug(GOSSIP_DCACHE_DEBUG,
52 "%s:%s:%d "
53 "lookup failure |%s| or no match |%s|.\n",
54 __FILE__,
55 __func__,
56 __LINE__,
57 new_op->downcall.status ? "true" : "false",
58 match_handle(new_op->downcall.resp.lookup.refn.khandle,
59 inode) ? "false" : "true");
60 gossip_debug(GOSSIP_DCACHE_DEBUG,
61 "%s:%s:%d revalidate failed\n",
62 __FILE__, __func__, __LINE__);
63 goto out_drop;
64 }
65
66 ret = 1;
67out_release_op:
68 op_release(new_op);
69out_put_parent:
70 dput(parent_dentry);
71 return ret;
72out_drop:
73 d_drop(dentry);
74 goto out_release_op;
75}
76
77/*
78 * Verify that dentry is valid.
79 *
80 * Should return 1 if dentry can still be trusted, else 0
81 */
8bb8aefd 82static int orangefs_d_revalidate(struct dentry *dentry, unsigned int flags)
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83{
84 struct inode *inode;
85 int ret = 0;
86
87 if (flags & LOOKUP_RCU)
88 return -ECHILD;
89
90 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: called on dentry %p.\n",
91 __func__, dentry);
92
93 /* find inode from dentry */
94 if (!dentry->d_inode) {
95 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: negative dentry.\n",
96 __func__);
97 goto invalid_exit;
98 }
99
100 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: inode valid.\n", __func__);
101 inode = dentry->d_inode;
102
103 /*
104 * first perform a lookup to make sure that the object not only
105 * exists, but is still in the expected place in the name space
106 */
107 if (!is_root_handle(inode)) {
8bb8aefd 108 if (!orangefs_revalidate_lookup(dentry))
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109 goto invalid_exit;
110 } else {
111 gossip_debug(GOSSIP_DCACHE_DEBUG,
112 "%s: root handle, lookup skipped.\n",
113 __func__);
114 }
115
116 /* now perform getattr */
117 gossip_debug(GOSSIP_DCACHE_DEBUG,
118 "%s: doing getattr: inode: %p, handle: %pU\n",
119 __func__,
120 inode,
121 get_khandle_from_ino(inode));
8bb8aefd 122 ret = orangefs_inode_getattr(inode, ORANGEFS_ATTR_SYS_ALL_NOHINT);
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123 gossip_debug(GOSSIP_DCACHE_DEBUG,
124 "%s: getattr %s (ret = %d), returning %s for dentry i_count=%d\n",
125 __func__,
126 (ret == 0 ? "succeeded" : "failed"),
127 ret,
128 (ret == 0 ? "valid" : "INVALID"),
129 atomic_read(&inode->i_count));
130 if (ret != 0)
131 goto invalid_exit;
132
133 /* dentry is valid! */
134 return 1;
135
136invalid_exit:
137 return 0;
138}
139
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140const struct dentry_operations orangefs_dentry_operations = {
141 .d_revalidate = orangefs_d_revalidate,
5db11c21 142};