blob: 5dfc4f3cfe68a2962bbfe03e13a940aae173c8ef [file] [log] [blame]
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,
Martin Brandenburg47b49482016-02-20 14:22:40 -050035 ORANGEFS_NAME_MAX);
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 goto out_release_op;
86}
87
88/*
89 * Verify that dentry is valid.
90 *
Mike Marshallf987f4c2015-12-30 13:04:28 -050091 * Should return 1 if dentry can still be trusted, else 0.
Mike Marshall5db11c22015-07-17 10:38:12 -040092 */
Yi Liu8bb8aef2015-11-24 15:12:14 -050093static int orangefs_d_revalidate(struct dentry *dentry, unsigned int flags)
Mike Marshall5db11c22015-07-17 10:38:12 -040094{
Martin Brandenburg99109822016-01-28 10:19:40 -050095 int ret;
Mike Marshall5db11c22015-07-17 10:38:12 -040096
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
Mike Marshallf987f4c2015-12-30 13:04:28 -0500103 /* skip root handle lookups. */
Martin Brandenburg99109822016-01-28 10:19:40 -0500104 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 */
Martin Brandenburgee70fca2016-02-20 13:10:47 -0500111 if (!orangefs_revalidate_lookup(dentry))
Martin Brandenburg99109822016-01-28 10:19:40 -0500112 return 0;
Mike Marshall5db11c22015-07-17 10:38:12 -0400113
Martin Brandenburg99109822016-01-28 10:19:40 -0500114 /* 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. */
Martin Brandenburg933287d2016-01-30 13:46:54 -0500119
Martin Brandenburg5859d772016-03-17 15:15:16 -0400120 ret = orangefs_inode_check_changed(dentry->d_inode);
Martin Brandenburg99109822016-01-28 10:19:40 -0500121 if (ret < 0) {
122 gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d getattr failure.\n",
123 __FILE__, __func__, __LINE__);
Martin Brandenburg99109822016-01-28 10:19:40 -0500124 return 0;
125 }
Martin Brandenburgee70fca2016-02-20 13:10:47 -0500126 if (ret == 0)
Martin Brandenburg99109822016-01-28 10:19:40 -0500127 return 0;
Mike Marshall5db11c22015-07-17 10:38:12 -0400128
Mike Marshallf987f4c2015-12-30 13:04:28 -0500129out:
Martin Brandenburg99109822016-01-28 10:19:40 -0500130 gossip_debug(GOSSIP_DCACHE_DEBUG,
131 "%s: negative dentry or positive dentry and inode valid.\n",
132 __func__);
133 return 1;
Mike Marshall5db11c22015-07-17 10:38:12 -0400134}
135
Yi Liu8bb8aef2015-11-24 15:12:14 -0500136const struct dentry_operations orangefs_dentry_operations = {
137 .d_revalidate = orangefs_d_revalidate,
Mike Marshall5db11c22015-07-17 10:38:12 -0400138};