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TOMOYO Linux Cross Reference
Linux/fs/xfs/xfs_rw.c

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  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  */
 40 void
 41 xfs_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                 xfs_notice(mp,
 53         "%s(0x%x) called from line %d of file %s.  Return address = 0x%p",
 54                         __func__, 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_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
 73     "Corruption of in-memory data detected.  Shutting down filesystem");
 74                 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
 75                         xfs_stack_trace();
 76         } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 77                 if (logerror) {
 78                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
 79                 "Log I/O Error Detected.  Shutting down filesystem");
 80                 } else if (flags & SHUTDOWN_DEVICE_REQ) {
 81                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 82                 "All device paths lost.  Shutting down filesystem");
 83                 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
 84                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 85                 "I/O Error Detected. Shutting down filesystem");
 86                 }
 87         }
 88         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 89                 xfs_alert(mp,
 90         "Please umount the filesystem and rectify the problem(s)");
 91         }
 92 }
 93 
 94 /*
 95  * Prints out an ALERT message about I/O error.
 96  */
 97 void
 98 xfs_ioerror_alert(
 99         char                    *func,
100         struct xfs_mount        *mp,
101         xfs_buf_t               *bp,
102         xfs_daddr_t             blkno)
103 {
104         xfs_alert(mp,
105                  "I/O error occurred: meta-data dev %s block 0x%llx"
106                  "       (\"%s\") error %d buf count %zd",
107                 XFS_BUFTARG_NAME(XFS_BUF_TARGET(bp)),
108                 (__uint64_t)blkno, func,
109                 XFS_BUF_GETERROR(bp), XFS_BUF_COUNT(bp));
110 }
111 
112 /*
113  * This isn't an absolute requirement, but it is
114  * just a good idea to call xfs_read_buf instead of
115  * directly doing a read_buf call. For one, we shouldn't
116  * be doing this disk read if we are in SHUTDOWN state anyway,
117  * so this stops that from happening. Secondly, this does all
118  * the error checking stuff and the brelse if appropriate for
119  * the caller, so the code can be a little leaner.
120  */
121 
122 int
123 xfs_read_buf(
124         struct xfs_mount *mp,
125         xfs_buftarg_t    *target,
126         xfs_daddr_t      blkno,
127         int              len,
128         uint             flags,
129         xfs_buf_t        **bpp)
130 {
131         xfs_buf_t        *bp;
132         int              error;
133 
134         if (!flags)
135                 flags = XBF_LOCK | XBF_MAPPED;
136 
137         bp = xfs_buf_read(target, blkno, len, flags);
138         if (!bp)
139                 return XFS_ERROR(EIO);
140         error = XFS_BUF_GETERROR(bp);
141         if (bp && !error && !XFS_FORCED_SHUTDOWN(mp)) {
142                 *bpp = bp;
143         } else {
144                 *bpp = NULL;
145                 if (error) {
146                         xfs_ioerror_alert("xfs_read_buf", mp, bp, XFS_BUF_ADDR(bp));
147                 } else {
148                         error = XFS_ERROR(EIO);
149                 }
150                 if (bp) {
151                         XFS_BUF_UNDONE(bp);
152                         XFS_BUF_UNDELAYWRITE(bp);
153                         XFS_BUF_STALE(bp);
154                         /*
155                          * brelse clears B_ERROR and b_error
156                          */
157                         xfs_buf_relse(bp);
158                 }
159         }
160         return (error);
161 }
162 
163 /*
164  * helper function to extract extent size hint from inode
165  */
166 xfs_extlen_t
167 xfs_get_extsz_hint(
168         struct xfs_inode        *ip)
169 {
170         if ((ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE) && ip->i_d.di_extsize)
171                 return ip->i_d.di_extsize;
172         if (XFS_IS_REALTIME_INODE(ip))
173                 return ip->i_mount->m_sb.sb_rextsize;
174         return 0;
175 }
176 

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