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 * Revalidate the Linux inode from the XFS inode.
87 * Note: i_size _not_ updated; we must hold the inode
88 * semaphore when doing that - callers responsibility.
89 */
90int
91vn_revalidate(
92 bhv_vnode_t *vp)
93{
94 struct inode *inode = vn_to_inode(vp);
95 struct xfs_inode *ip = XFS_I(inode);
96 struct xfs_mount *mp = ip->i_mount;
97 unsigned long xflags;
98
99 xfs_itrace_entry(ip);
100
101 if (XFS_FORCED_SHUTDOWN(mp))
102 return -EIO;
103
104 xfs_ilock(ip, XFS_ILOCK_SHARED);
105 inode->i_mode = ip->i_d.di_mode;
106 inode->i_uid = ip->i_d.di_uid;
107 inode->i_gid = ip->i_d.di_gid;
108 inode->i_mtime.tv_sec = ip->i_d.di_mtime.t_sec;
109 inode->i_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec;
110 inode->i_ctime.tv_sec = ip->i_d.di_ctime.t_sec;
111 inode->i_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec;
112
113 xflags = xfs_ip2xflags(ip);
114 if (xflags & XFS_XFLAG_IMMUTABLE)
115 inode->i_flags |= S_IMMUTABLE;
116 else
117 inode->i_flags &= ~S_IMMUTABLE;
118 if (xflags & XFS_XFLAG_APPEND)
119 inode->i_flags |= S_APPEND;
120 else
121 inode->i_flags &= ~S_APPEND;
122 if (xflags & XFS_XFLAG_SYNC)
123 inode->i_flags |= S_SYNC;
124 else
125 inode->i_flags &= ~S_SYNC;
126 if (xflags & XFS_XFLAG_NOATIME)
127 inode->i_flags |= S_NOATIME;
128 else
129 inode->i_flags &= ~S_NOATIME;
130 xfs_iunlock(ip, XFS_ILOCK_SHARED);
131
132 xfs_iflags_clear(ip, XFS_IMODIFIED);
133 return 0;
134}
135
136/*
137 * Add a reference to a referenced vnode.
138 */
139bhv_vnode_t *
140vn_hold(
141 bhv_vnode_t *vp)
142{
143 struct inode *inode;
144
145 XFS_STATS_INC(vn_hold);
146
147 inode = igrab(vn_to_inode(vp));
148 ASSERT(inode);
149
150 return vp;
151}
152
153#ifdef XFS_INODE_TRACE
154
155/*
156 * Reference count of Linux inode if present, -1 if the xfs_inode
157 * has no associated Linux inode.
158 */
159static inline int xfs_icount(struct xfs_inode *ip)
160{
161 bhv_vnode_t *vp = XFS_ITOV_NULL(ip);
162
163 if (vp)
164 return vn_count(vp);
165 return -1;
166}
167
168#define KTRACE_ENTER(ip, vk, s, line, ra) \
169 ktrace_enter( (ip)->i_trace, \
170/* 0 */ (void *)(__psint_t)(vk), \
171/* 1 */ (void *)(s), \
172/* 2 */ (void *)(__psint_t) line, \
173/* 3 */ (void *)(__psint_t)xfs_icount(ip), \
174/* 4 */ (void *)(ra), \
175/* 5 */ NULL, \
176/* 6 */ (void *)(__psint_t)current_cpu(), \
177/* 7 */ (void *)(__psint_t)current_pid(), \
178/* 8 */ (void *)__return_address, \
179/* 9 */ NULL, NULL, NULL, NULL, NULL, NULL, NULL)
180
181/*
182 * Vnode tracing code.
183 */
184void
185_xfs_itrace_entry(xfs_inode_t *ip, const char *func, inst_t *ra)
186{
187 KTRACE_ENTER(ip, INODE_KTRACE_ENTRY, func, 0, ra);
188}
189
190void
191_xfs_itrace_exit(xfs_inode_t *ip, const char *func, inst_t *ra)
192{
193 KTRACE_ENTER(ip, INODE_KTRACE_EXIT, func, 0, ra);
194}
195
196void
197xfs_itrace_hold(xfs_inode_t *ip, char *file, int line, inst_t *ra)
198{
199 KTRACE_ENTER(ip, INODE_KTRACE_HOLD, file, line, ra);
200}
201
202void
203_xfs_itrace_ref(xfs_inode_t *ip, char *file, int line, inst_t *ra)
204{
205 KTRACE_ENTER(ip, INODE_KTRACE_REF, file, line, ra);
206}
207
208void
209xfs_itrace_rele(xfs_inode_t *ip, char *file, int line, inst_t *ra)
210{
211 KTRACE_ENTER(ip, INODE_KTRACE_RELE, file, line, ra);
212}
213#endif /* XFS_INODE_TRACE */