1/*
2 * Copyright (c) 2000-2006 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_fs.h"
20#include "xfs_types.h"
21#include "xfs_bit.h"
22#include "xfs_log.h"
23#include "xfs_inum.h"
24#include "xfs_trans.h"
25#include "xfs_sb.h"
26#include "xfs_ag.h"
27#include "xfs_mount.h"
28#include "xfs_bmap_btree.h"
29#include "xfs_dinode.h"
30#include "xfs_inode.h"
31#include "xfs_error.h"
32#include "xfs_rw.h"
33
34/*
35 * Force a shutdown of the filesystem instantly while keeping
36 * the filesystem consistent. We don't do an unmount here; just shutdown
37 * the shop, make sure that absolutely nothing persistent happens to
38 * this filesystem after this point.
39 */
40void
41xfs_do_force_shutdown(
42	xfs_mount_t	*mp,
43	int		flags,
44	char		*fname,
45	int		lnnum)
46{
47	int		logerror;
48
49	logerror = flags & SHUTDOWN_LOG_IO_ERROR;
50
51	if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
52		cmn_err(CE_NOTE, "xfs_force_shutdown(%s,0x%x) called from "
53				 "line %d of file %s.  Return address = 0x%p",
54			mp->m_fsname, flags, lnnum, fname, __return_address);
55	}
56	/*
57	 * No need to duplicate efforts.
58	 */
59	if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
60		return;
61
62	/*
63	 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
64	 * queue up anybody new on the log reservations, and wakes up
65	 * everybody who's sleeping on log reservations to tell them
66	 * the bad news.
67	 */
68	if (xfs_log_force_umount(mp, logerror))
69		return;
70
71	if (flags & SHUTDOWN_CORRUPT_INCORE) {
72		xfs_cmn_err(XFS_PTAG_SHUTDOWN_CORRUPT, CE_ALERT, mp,
73    "Corruption of in-memory data detected.  Shutting down filesystem: %s",
74			mp->m_fsname);
75		if (XFS_ERRLEVEL_HIGH <= xfs_error_level) {
76			xfs_stack_trace();
77		}
78	} else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
79		if (logerror) {
80			xfs_cmn_err(XFS_PTAG_SHUTDOWN_LOGERROR, CE_ALERT, mp,
81		"Log I/O Error Detected.  Shutting down filesystem: %s",
82				mp->m_fsname);
83		} else if (flags & SHUTDOWN_DEVICE_REQ) {
84			xfs_cmn_err(XFS_PTAG_SHUTDOWN_IOERROR, CE_ALERT, mp,
85		"All device paths lost.  Shutting down filesystem: %s",
86				mp->m_fsname);
87		} else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
88			xfs_cmn_err(XFS_PTAG_SHUTDOWN_IOERROR, CE_ALERT, mp,
89		"I/O Error Detected.  Shutting down filesystem: %s",
90				mp->m_fsname);
91		}
92	}
93	if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
94		cmn_err(CE_ALERT, "Please umount the filesystem, "
95				  "and rectify the problem(s)");
96	}
97}
98
99/*
100 * Prints out an ALERT message about I/O error.
101 */
102void
103xfs_ioerror_alert(
104	char			*func,
105	struct xfs_mount	*mp,
106	xfs_buf_t		*bp,
107	xfs_daddr_t		blkno)
108{
109	cmn_err(CE_ALERT,
110 "I/O error in filesystem (\"%s\") meta-data dev %s block 0x%llx"
111 "       (\"%s\") error %d buf count %zd",
112		(!mp || !mp->m_fsname) ? "(fs name not set)" : mp->m_fsname,
113		XFS_BUFTARG_NAME(XFS_BUF_TARGET(bp)),
114		(__uint64_t)blkno, func,
115		XFS_BUF_GETERROR(bp), XFS_BUF_COUNT(bp));
116}
117
118/*
119 * This isn't an absolute requirement, but it is
120 * just a good idea to call xfs_read_buf instead of
121 * directly doing a read_buf call. For one, we shouldn't
122 * be doing this disk read if we are in SHUTDOWN state anyway,
123 * so this stops that from happening. Secondly, this does all
124 * the error checking stuff and the brelse if appropriate for
125 * the caller, so the code can be a little leaner.
126 */
127
128int
129xfs_read_buf(
130	struct xfs_mount *mp,
131	xfs_buftarg_t	 *target,
132	xfs_daddr_t	 blkno,
133	int              len,
134	uint             flags,
135	xfs_buf_t	 **bpp)
136{
137	xfs_buf_t	 *bp;
138	int		 error;
139
140	if (!flags)
141		flags = XBF_LOCK | XBF_MAPPED;
142
143	bp = xfs_buf_read(target, blkno, len, flags);
144	if (!bp)
145		return XFS_ERROR(EIO);
146	error = XFS_BUF_GETERROR(bp);
147	if (bp && !error && !XFS_FORCED_SHUTDOWN(mp)) {
148		*bpp = bp;
149	} else {
150		*bpp = NULL;
151		if (error) {
152			xfs_ioerror_alert("xfs_read_buf", mp, bp, XFS_BUF_ADDR(bp));
153		} else {
154			error = XFS_ERROR(EIO);
155		}
156		if (bp) {
157			XFS_BUF_UNDONE(bp);
158			XFS_BUF_UNDELAYWRITE(bp);
159			XFS_BUF_STALE(bp);
160			/*
161			 * brelse clears B_ERROR and b_error
162			 */
163			xfs_buf_relse(bp);
164		}
165	}
166	return (error);
167}
168
169/*
170 * helper function to extract extent size hint from inode
171 */
172xfs_extlen_t
173xfs_get_extsz_hint(
174	struct xfs_inode	*ip)
175{
176	xfs_extlen_t		extsz;
177
178	if (unlikely(XFS_IS_REALTIME_INODE(ip))) {
179		extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
180				? ip->i_d.di_extsize
181				: ip->i_mount->m_sb.sb_rextsize;
182		ASSERT(extsz);
183	} else {
184		extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
185				? ip->i_d.di_extsize : 0;
186	}
187
188	return extsz;
189}
190