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_bmap_btree.h"
31 #include "xfs_alloc_btree.h"
32 #include "xfs_ialloc_btree.h"
33 #include "xfs_dir2_sf.h"
34 #include "xfs_attr_sf.h"
35 #include "xfs_dinode.h"
36 #include "xfs_inode.h"
37 #include "xfs_btree.h"
38 #include "xfs_ialloc.h"
39 #include "xfs_trans_priv.h"
40 #include "xfs_inode_item.h"
41
42 #ifdef XFS_TRANS_DEBUG
43 STATIC void
44 xfs_trans_inode_broot_debug(
45 xfs_inode_t *ip);
46 #else
47 #define xfs_trans_inode_broot_debug(ip)
48 #endif
49
50
51 /*
52 * Get and lock the inode for the caller if it is not already
53 * locked within the given transaction. If it is already locked
54 * within the transaction, just increment its lock recursion count
55 * and return a pointer to it.
56 *
57 * For an inode to be locked in a transaction, the inode lock, as
58 * opposed to the io lock, must be taken exclusively. This ensures
59 * that the inode can be involved in only 1 transaction at a time.
60 * Lock recursion is handled on the io lock, but only for lock modes
61 * of equal or lesser strength. That is, you can recur on the io lock
62 * held EXCL with a SHARED request but not vice versa. Also, if
63 * the inode is already a part of the transaction then you cannot
64 * go from not holding the io lock to having it EXCL or SHARED.
65 *
66 * Use the inode cache routine xfs_inode_incore() to find the inode
67 * if it is already owned by this transaction.
68 *
69 * If we don't already own the inode, use xfs_iget() to get it.
70 * Since the inode log item structure is embedded in the incore
71 * inode structure and is initialized when the inode is brought
72 * into memory, there is nothing to do with it here.
73 *
74 * If the given transaction pointer is NULL, just call xfs_iget().
75 * This simplifies code which must handle both cases.
76 */
77 int
xfs_trans_iget(xfs_mount_t * mp,xfs_trans_t * tp,xfs_ino_t ino,uint flags,uint lock_flags,xfs_inode_t ** ipp)78 xfs_trans_iget(
79 xfs_mount_t *mp,
80 xfs_trans_t *tp,
81 xfs_ino_t ino,
82 uint flags,
83 uint lock_flags,
84 xfs_inode_t **ipp)
85 {
86 int error;
87 xfs_inode_t *ip;
88
89 /*
90 * If the transaction pointer is NULL, just call the normal
91 * xfs_iget().
92 */
93 if (tp == NULL)
94 return xfs_iget(mp, NULL, ino, flags, lock_flags, ipp, 0);
95
96 /*
97 * If we find the inode in core with this transaction
98 * pointer in its i_transp field, then we know we already
99 * have it locked. In this case we just increment the lock
100 * recursion count and return the inode to the caller.
101 * Assert that the inode is already locked in the mode requested
102 * by the caller. We cannot do lock promotions yet, so
103 * die if someone gets this wrong.
104 */
105 if ((ip = xfs_inode_incore(tp->t_mountp, ino, tp)) != NULL) {
106 /*
107 * Make sure that the inode lock is held EXCL and
108 * that the io lock is never upgraded when the inode
109 * is already a part of the transaction.
110 */
111 ASSERT(ip->i_itemp != NULL);
112 ASSERT(lock_flags & XFS_ILOCK_EXCL);
113 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
114 ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) ||
115 xfs_isilocked(ip, XFS_IOLOCK_EXCL));
116 ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) ||
117 (ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_EXCL));
118 ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) ||
119 xfs_isilocked(ip, XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED));
120 ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) ||
121 (ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_ANY));
122
123 if (lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) {
124 ip->i_itemp->ili_iolock_recur++;
125 }
126 if (lock_flags & XFS_ILOCK_EXCL) {
127 ip->i_itemp->ili_ilock_recur++;
128 }
129 *ipp = ip;
130 return 0;
131 }
132
133 ASSERT(lock_flags & XFS_ILOCK_EXCL);
134 error = xfs_iget(tp->t_mountp, tp, ino, flags, lock_flags, &ip, 0);
135 if (error) {
136 return error;
137 }
138 ASSERT(ip != NULL);
139
140 xfs_trans_ijoin(tp, ip, lock_flags);
141 *ipp = ip;
142 return 0;
143 }
144
145 /*
146 * Add the locked inode to the transaction.
147 * The inode must be locked, and it cannot be associated with any
148 * transaction. The caller must specify the locks already held
149 * on the inode.
150 */
151 void
xfs_trans_ijoin(xfs_trans_t * tp,xfs_inode_t * ip,uint lock_flags)152 xfs_trans_ijoin(
153 xfs_trans_t *tp,
154 xfs_inode_t *ip,
155 uint lock_flags)
156 {
157 xfs_inode_log_item_t *iip;
158
159 ASSERT(ip->i_transp == NULL);
160 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
161 ASSERT(lock_flags & XFS_ILOCK_EXCL);
162 if (ip->i_itemp == NULL)
163 xfs_inode_item_init(ip, ip->i_mount);
164 iip = ip->i_itemp;
165 ASSERT(iip->ili_flags == 0);
166 ASSERT(iip->ili_ilock_recur == 0);
167 ASSERT(iip->ili_iolock_recur == 0);
168
169 /*
170 * Get a log_item_desc to point at the new item.
171 */
172 (void) xfs_trans_add_item(tp, (xfs_log_item_t*)(iip));
173
174 xfs_trans_inode_broot_debug(ip);
175
176 /*
177 * If the IO lock is already held, mark that in the inode log item.
178 */
179 if (lock_flags & XFS_IOLOCK_EXCL) {
180 iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL;
181 } else if (lock_flags & XFS_IOLOCK_SHARED) {
182 iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED;
183 }
184
185 /*
186 * Initialize i_transp so we can find it with xfs_inode_incore()
187 * in xfs_trans_iget() above.
188 */
189 ip->i_transp = tp;
190 }
191
192
193
194 /*
195 * Mark the inode as not needing to be unlocked when the inode item's
196 * IOP_UNLOCK() routine is called. The inode must already be locked
197 * and associated with the given transaction.
198 */
199 /*ARGSUSED*/
200 void
xfs_trans_ihold(xfs_trans_t * tp,xfs_inode_t * ip)201 xfs_trans_ihold(
202 xfs_trans_t *tp,
203 xfs_inode_t *ip)
204 {
205 ASSERT(ip->i_transp == tp);
206 ASSERT(ip->i_itemp != NULL);
207 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
208
209 ip->i_itemp->ili_flags |= XFS_ILI_HOLD;
210 }
211
212
213 /*
214 * This is called to mark the fields indicated in fieldmask as needing
215 * to be logged when the transaction is committed. The inode must
216 * already be associated with the given transaction.
217 *
218 * The values for fieldmask are defined in xfs_inode_item.h. We always
219 * log all of the core inode if any of it has changed, and we always log
220 * all of the inline data/extents/b-tree root if any of them has changed.
221 */
222 void
xfs_trans_log_inode(xfs_trans_t * tp,xfs_inode_t * ip,uint flags)223 xfs_trans_log_inode(
224 xfs_trans_t *tp,
225 xfs_inode_t *ip,
226 uint flags)
227 {
228 xfs_log_item_desc_t *lidp;
229
230 ASSERT(ip->i_transp == tp);
231 ASSERT(ip->i_itemp != NULL);
232 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
233
234 lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)(ip->i_itemp));
235 ASSERT(lidp != NULL);
236
237 tp->t_flags |= XFS_TRANS_DIRTY;
238 lidp->lid_flags |= XFS_LID_DIRTY;
239
240 /*
241 * Always OR in the bits from the ili_last_fields field.
242 * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
243 * routines in the eventual clearing of the ilf_fields bits.
244 * See the big comment in xfs_iflush() for an explanation of
245 * this coordination mechanism.
246 */
247 flags |= ip->i_itemp->ili_last_fields;
248 ip->i_itemp->ili_format.ilf_fields |= flags;
249 }
250
251 #ifdef XFS_TRANS_DEBUG
252 /*
253 * Keep track of the state of the inode btree root to make sure we
254 * log it properly.
255 */
256 STATIC void
xfs_trans_inode_broot_debug(xfs_inode_t * ip)257 xfs_trans_inode_broot_debug(
258 xfs_inode_t *ip)
259 {
260 xfs_inode_log_item_t *iip;
261
262 ASSERT(ip->i_itemp != NULL);
263 iip = ip->i_itemp;
264 if (iip->ili_root_size != 0) {
265 ASSERT(iip->ili_orig_root != NULL);
266 kmem_free(iip->ili_orig_root);
267 iip->ili_root_size = 0;
268 iip->ili_orig_root = NULL;
269 }
270 if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
271 ASSERT((ip->i_df.if_broot != NULL) &&
272 (ip->i_df.if_broot_bytes > 0));
273 iip->ili_root_size = ip->i_df.if_broot_bytes;
274 iip->ili_orig_root =
275 (char*)kmem_alloc(iip->ili_root_size, KM_SLEEP);
276 memcpy(iip->ili_orig_root, (char*)(ip->i_df.if_broot),
277 iip->ili_root_size);
278 }
279 }
280 #endif
281