tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#include "xfs.h"
19#include "xfs_vnodeops.h"
20#include "xfs_bmap_btree.h"
21#include "xfs_inode.h"
22
23/*
24 * And this gunk is needed for xfs_mount.h"
25 */
26#include "xfs_log.h"
27#include "xfs_trans.h"
28#include "xfs_sb.h"
29#include "xfs_dmapi.h"
30#include "xfs_inum.h"
31#include "xfs_ag.h"
32#include "xfs_mount.h"
33
34
35/*
36 * Dedicated vnode inactive/reclaim sync semaphores.
37 * Prime number of hash buckets since address is used as the key.
38 */
39#define NVSYNC 37
40#define vptosync(v) (&vsync[((unsigned long)v) % NVSYNC])
41static wait_queue_head_t vsync[NVSYNC];
42
43void __init
44vn_init(void)
45{
46 int i;
47
48 for (i = 0; i < NVSYNC; i++)
49 init_waitqueue_head(&vsync[i]);
50}
51
52void
53vn_iowait(
54 xfs_inode_t *ip)
55{
56 wait_queue_head_t *wq = vptosync(ip);
57
58 wait_event(*wq, (atomic_read(&ip->i_iocount) == 0));
59}
60
61void
62vn_iowake(
63 xfs_inode_t *ip)
64{
65 if (atomic_dec_and_test(&ip->i_iocount))
66 wake_up(vptosync(ip));
67}
68
69/*
70 * Volume managers supporting multiple paths can send back ENODEV when the
71 * final path disappears. In this case continuing to fill the page cache
72 * with dirty data which cannot be written out is evil, so prevent that.
73 */
74void
75vn_ioerror(
76 xfs_inode_t *ip,
77 int error,
78 char *f,
79 int l)
80{
81 if (unlikely(error == -ENODEV))
82 xfs_do_force_shutdown(ip->i_mount, SHUTDOWN_DEVICE_REQ, f, l);
83}
84
85
86/*
87 * Add a reference to a referenced vnode.
88 */
89bhv_vnode_t *
90vn_hold(
91 bhv_vnode_t *vp)
92{
93 struct inode *inode;
94
95 XFS_STATS_INC(vn_hold);
96
97 inode = igrab(vn_to_inode(vp));
98 ASSERT(inode);
99
100 return vp;
101}
102
103#ifdef XFS_INODE_TRACE
104
105/*
106 * Reference count of Linux inode if present, -1 if the xfs_inode
107 * has no associated Linux inode.
108 */
109static inline int xfs_icount(struct xfs_inode *ip)
110{
111 bhv_vnode_t *vp = XFS_ITOV_NULL(ip);
112
113 if (vp)
114 return vn_count(vp);
115 return -1;
116}
117
118#define KTRACE_ENTER(ip, vk, s, line, ra) \
119 ktrace_enter( (ip)->i_trace, \
120/* 0 */ (void *)(__psint_t)(vk), \
121/* 1 */ (void *)(s), \
122/* 2 */ (void *)(__psint_t) line, \
123/* 3 */ (void *)(__psint_t)xfs_icount(ip), \
124/* 4 */ (void *)(ra), \
125/* 5 */ NULL, \
126/* 6 */ (void *)(__psint_t)current_cpu(), \
127/* 7 */ (void *)(__psint_t)current_pid(), \
128/* 8 */ (void *)__return_address, \
129/* 9 */ NULL, NULL, NULL, NULL, NULL, NULL, NULL)
130
131/*
132 * Vnode tracing code.
133 */
134void
135_xfs_itrace_entry(xfs_inode_t *ip, const char *func, inst_t *ra)
136{
137 KTRACE_ENTER(ip, INODE_KTRACE_ENTRY, func, 0, ra);
138}
139
140void
141_xfs_itrace_exit(xfs_inode_t *ip, const char *func, inst_t *ra)
142{
143 KTRACE_ENTER(ip, INODE_KTRACE_EXIT, func, 0, ra);
144}
145
146void
147xfs_itrace_hold(xfs_inode_t *ip, char *file, int line, inst_t *ra)
148{
149 KTRACE_ENTER(ip, INODE_KTRACE_HOLD, file, line, ra);
150}
151
152void
153_xfs_itrace_ref(xfs_inode_t *ip, char *file, int line, inst_t *ra)
154{
155 KTRACE_ENTER(ip, INODE_KTRACE_REF, file, line, ra);
156}
157
158void
159xfs_itrace_rele(xfs_inode_t *ip, char *file, int line, inst_t *ra)
160{
161 KTRACE_ENTER(ip, INODE_KTRACE_RELE, file, line, ra);
162}
163#endif /* XFS_INODE_TRACE */