[XFS] Cleanup maxrecs calculation.
[linux-2.6] / fs / xfs / xfs_vfsops.c
1 /*
2  * Copyright (c) 2000-2005 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_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_dir2.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_mount.h"
30 #include "xfs_da_btree.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_ialloc_btree.h"
33 #include "xfs_alloc_btree.h"
34 #include "xfs_dir2_sf.h"
35 #include "xfs_attr_sf.h"
36 #include "xfs_dinode.h"
37 #include "xfs_inode.h"
38 #include "xfs_inode_item.h"
39 #include "xfs_btree.h"
40 #include "xfs_alloc.h"
41 #include "xfs_ialloc.h"
42 #include "xfs_quota.h"
43 #include "xfs_error.h"
44 #include "xfs_bmap.h"
45 #include "xfs_rw.h"
46 #include "xfs_buf_item.h"
47 #include "xfs_log_priv.h"
48 #include "xfs_dir2_trace.h"
49 #include "xfs_extfree_item.h"
50 #include "xfs_acl.h"
51 #include "xfs_attr.h"
52 #include "xfs_clnt.h"
53 #include "xfs_mru_cache.h"
54 #include "xfs_filestream.h"
55 #include "xfs_fsops.h"
56 #include "xfs_vnodeops.h"
57 #include "xfs_vfsops.h"
58 #include "xfs_utils.h"
59 #include "xfs_sync.h"
60
61
62 STATIC void
63 xfs_quiesce_fs(
64         xfs_mount_t             *mp)
65 {
66         int                     count = 0, pincount;
67
68         xfs_flush_buftarg(mp->m_ddev_targp, 0);
69         xfs_finish_reclaim_all(mp, 0, XFS_IFLUSH_DELWRI_ELSE_ASYNC);
70
71         /* This loop must run at least twice.
72          * The first instance of the loop will flush
73          * most meta data but that will generate more
74          * meta data (typically directory updates).
75          * Which then must be flushed and logged before
76          * we can write the unmount record.
77          */
78         do {
79                 xfs_syncsub(mp, SYNC_INODE_QUIESCE, NULL);
80                 pincount = xfs_flush_buftarg(mp->m_ddev_targp, 1);
81                 if (!pincount) {
82                         delay(50);
83                         count++;
84                 }
85         } while (count < 2);
86 }
87
88 /*
89  * Second stage of a quiesce. The data is already synced, now we have to take
90  * care of the metadata. New transactions are already blocked, so we need to
91  * wait for any remaining transactions to drain out before proceding.
92  */
93 void
94 xfs_attr_quiesce(
95         xfs_mount_t     *mp)
96 {
97         int     error = 0;
98
99         /* wait for all modifications to complete */
100         while (atomic_read(&mp->m_active_trans) > 0)
101                 delay(100);
102
103         /* flush inodes and push all remaining buffers out to disk */
104         xfs_quiesce_fs(mp);
105
106         ASSERT_ALWAYS(atomic_read(&mp->m_active_trans) == 0);
107
108         /* Push the superblock and write an unmount record */
109         error = xfs_log_sbcount(mp, 1);
110         if (error)
111                 xfs_fs_cmn_err(CE_WARN, mp,
112                                 "xfs_attr_quiesce: failed to log sb changes. "
113                                 "Frozen image may not be consistent.");
114         xfs_log_unmount_write(mp);
115         xfs_unmountfs_writesb(mp);
116 }
117
118 /*
119  * xfs_unmount_flush implements a set of flush operation on special
120  * inodes, which are needed as a separate set of operations so that
121  * they can be called as part of relocation process.
122  */
123 int
124 xfs_unmount_flush(
125         xfs_mount_t     *mp,            /* Mount structure we are getting
126                                            rid of. */
127         int             relocation)     /* Called from vfs relocation. */
128 {
129         xfs_inode_t     *rip = mp->m_rootip;
130         xfs_inode_t     *rbmip;
131         xfs_inode_t     *rsumip = NULL;
132         int             error;
133
134         xfs_ilock(rip, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
135         xfs_iflock(rip);
136
137         /*
138          * Flush out the real time inodes.
139          */
140         if ((rbmip = mp->m_rbmip) != NULL) {
141                 xfs_ilock(rbmip, XFS_ILOCK_EXCL);
142                 xfs_iflock(rbmip);
143                 error = xfs_iflush(rbmip, XFS_IFLUSH_SYNC);
144                 xfs_iunlock(rbmip, XFS_ILOCK_EXCL);
145
146                 if (error == EFSCORRUPTED)
147                         goto fscorrupt_out;
148
149                 ASSERT(vn_count(VFS_I(rbmip)) == 1);
150
151                 rsumip = mp->m_rsumip;
152                 xfs_ilock(rsumip, XFS_ILOCK_EXCL);
153                 xfs_iflock(rsumip);
154                 error = xfs_iflush(rsumip, XFS_IFLUSH_SYNC);
155                 xfs_iunlock(rsumip, XFS_ILOCK_EXCL);
156
157                 if (error == EFSCORRUPTED)
158                         goto fscorrupt_out;
159
160                 ASSERT(vn_count(VFS_I(rsumip)) == 1);
161         }
162
163         /*
164          * Synchronously flush root inode to disk
165          */
166         error = xfs_iflush(rip, XFS_IFLUSH_SYNC);
167         if (error == EFSCORRUPTED)
168                 goto fscorrupt_out2;
169
170         if (vn_count(VFS_I(rip)) != 1 && !relocation) {
171                 xfs_iunlock(rip, XFS_ILOCK_EXCL);
172                 return XFS_ERROR(EBUSY);
173         }
174
175         /*
176          * Release dquot that rootinode, rbmino and rsumino might be holding,
177          * flush and purge the quota inodes.
178          */
179         error = XFS_QM_UNMOUNT(mp);
180         if (error == EFSCORRUPTED)
181                 goto fscorrupt_out2;
182
183         if (rbmip) {
184                 IRELE(rbmip);
185                 IRELE(rsumip);
186         }
187
188         xfs_iunlock(rip, XFS_ILOCK_EXCL);
189         return 0;
190
191 fscorrupt_out:
192         xfs_ifunlock(rip);
193
194 fscorrupt_out2:
195         xfs_iunlock(rip, XFS_ILOCK_EXCL);
196
197         return XFS_ERROR(EFSCORRUPTED);
198 }
199