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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
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. | |
1da177e4 | 13 | * |
7b718769 NS |
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 | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 LT |
24 | #include "xfs_trans.h" |
25 | #include "xfs_sb.h" | |
26 | #include "xfs_ag.h" | |
1da177e4 LT |
27 | #include "xfs_dir2.h" |
28 | #include "xfs_dmapi.h" | |
29 | #include "xfs_mount.h" | |
1da177e4 | 30 | #include "xfs_bmap_btree.h" |
a844f451 | 31 | #include "xfs_alloc_btree.h" |
1da177e4 | 32 | #include "xfs_ialloc_btree.h" |
1da177e4 | 33 | #include "xfs_dir2_sf.h" |
a844f451 | 34 | #include "xfs_attr_sf.h" |
1da177e4 | 35 | #include "xfs_dinode.h" |
1da177e4 | 36 | #include "xfs_inode.h" |
a844f451 NS |
37 | #include "xfs_btree.h" |
38 | #include "xfs_ialloc.h" | |
39 | #include "xfs_trans_priv.h" | |
40 | #include "xfs_inode_item.h" | |
1da177e4 LT |
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 | |
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 | xfs_inode_log_item_t *iip; | |
89 | ||
90 | /* | |
91 | * If the transaction pointer is NULL, just call the normal | |
92 | * xfs_iget(). | |
93 | */ | |
94 | if (tp == NULL) | |
95 | return xfs_iget(mp, NULL, ino, flags, lock_flags, ipp, 0); | |
96 | ||
97 | /* | |
98 | * If we find the inode in core with this transaction | |
99 | * pointer in its i_transp field, then we know we already | |
100 | * have it locked. In this case we just increment the lock | |
101 | * recursion count and return the inode to the caller. | |
102 | * Assert that the inode is already locked in the mode requested | |
103 | * by the caller. We cannot do lock promotions yet, so | |
104 | * die if someone gets this wrong. | |
105 | */ | |
106 | if ((ip = xfs_inode_incore(tp->t_mountp, ino, tp)) != NULL) { | |
107 | /* | |
108 | * Make sure that the inode lock is held EXCL and | |
109 | * that the io lock is never upgraded when the inode | |
110 | * is already a part of the transaction. | |
111 | */ | |
112 | ASSERT(ip->i_itemp != NULL); | |
113 | ASSERT(lock_flags & XFS_ILOCK_EXCL); | |
114 | ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE)); | |
115 | ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) || | |
116 | ismrlocked(&ip->i_iolock, MR_UPDATE)); | |
117 | ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) || | |
118 | (ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_EXCL)); | |
119 | ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) || | |
120 | ismrlocked(&ip->i_iolock, (MR_UPDATE | MR_ACCESS))); | |
121 | ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) || | |
122 | (ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_ANY)); | |
123 | ||
124 | if (lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) { | |
125 | ip->i_itemp->ili_iolock_recur++; | |
126 | } | |
127 | if (lock_flags & XFS_ILOCK_EXCL) { | |
128 | ip->i_itemp->ili_ilock_recur++; | |
129 | } | |
130 | *ipp = ip; | |
131 | return 0; | |
132 | } | |
133 | ||
134 | ASSERT(lock_flags & XFS_ILOCK_EXCL); | |
135 | error = xfs_iget(tp->t_mountp, tp, ino, flags, lock_flags, &ip, 0); | |
136 | if (error) { | |
137 | return error; | |
138 | } | |
139 | ASSERT(ip != NULL); | |
140 | ||
141 | /* | |
142 | * Get a log_item_desc to point at the new item. | |
143 | */ | |
144 | if (ip->i_itemp == NULL) | |
145 | xfs_inode_item_init(ip, mp); | |
146 | iip = ip->i_itemp; | |
147 | (void) xfs_trans_add_item(tp, (xfs_log_item_t *)(iip)); | |
148 | ||
149 | xfs_trans_inode_broot_debug(ip); | |
150 | ||
151 | /* | |
152 | * If the IO lock has been acquired, mark that in | |
153 | * the inode log item so we'll know to unlock it | |
154 | * when the transaction commits. | |
155 | */ | |
156 | ASSERT(iip->ili_flags == 0); | |
157 | if (lock_flags & XFS_IOLOCK_EXCL) { | |
158 | iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL; | |
159 | } else if (lock_flags & XFS_IOLOCK_SHARED) { | |
160 | iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED; | |
161 | } | |
162 | ||
163 | /* | |
164 | * Initialize i_transp so we can find it with xfs_inode_incore() | |
165 | * above. | |
166 | */ | |
167 | ip->i_transp = tp; | |
168 | ||
169 | *ipp = ip; | |
170 | return 0; | |
171 | } | |
172 | ||
173 | /* | |
174 | * Add the locked inode to the transaction. | |
175 | * The inode must be locked, and it cannot be associated with any | |
176 | * transaction. The caller must specify the locks already held | |
177 | * on the inode. | |
178 | */ | |
179 | void | |
180 | xfs_trans_ijoin( | |
181 | xfs_trans_t *tp, | |
182 | xfs_inode_t *ip, | |
183 | uint lock_flags) | |
184 | { | |
185 | xfs_inode_log_item_t *iip; | |
186 | ||
187 | ASSERT(ip->i_transp == NULL); | |
188 | ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE)); | |
189 | ASSERT(lock_flags & XFS_ILOCK_EXCL); | |
190 | if (ip->i_itemp == NULL) | |
191 | xfs_inode_item_init(ip, ip->i_mount); | |
192 | iip = ip->i_itemp; | |
193 | ASSERT(iip->ili_flags == 0); | |
194 | ASSERT(iip->ili_ilock_recur == 0); | |
195 | ASSERT(iip->ili_iolock_recur == 0); | |
196 | ||
197 | /* | |
198 | * Get a log_item_desc to point at the new item. | |
199 | */ | |
200 | (void) xfs_trans_add_item(tp, (xfs_log_item_t*)(iip)); | |
201 | ||
202 | xfs_trans_inode_broot_debug(ip); | |
203 | ||
204 | /* | |
205 | * If the IO lock is already held, mark that in the inode log item. | |
206 | */ | |
207 | if (lock_flags & XFS_IOLOCK_EXCL) { | |
208 | iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL; | |
209 | } else if (lock_flags & XFS_IOLOCK_SHARED) { | |
210 | iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED; | |
211 | } | |
212 | ||
213 | /* | |
214 | * Initialize i_transp so we can find it with xfs_inode_incore() | |
215 | * in xfs_trans_iget() above. | |
216 | */ | |
217 | ip->i_transp = tp; | |
218 | } | |
219 | ||
220 | ||
221 | ||
222 | /* | |
223 | * Mark the inode as not needing to be unlocked when the inode item's | |
224 | * IOP_UNLOCK() routine is called. The inode must already be locked | |
225 | * and associated with the given transaction. | |
226 | */ | |
227 | /*ARGSUSED*/ | |
228 | void | |
229 | xfs_trans_ihold( | |
230 | xfs_trans_t *tp, | |
231 | xfs_inode_t *ip) | |
232 | { | |
233 | ASSERT(ip->i_transp == tp); | |
234 | ASSERT(ip->i_itemp != NULL); | |
235 | ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE)); | |
236 | ||
237 | ip->i_itemp->ili_flags |= XFS_ILI_HOLD; | |
238 | } | |
239 | ||
1da177e4 LT |
240 | |
241 | /* | |
242 | * This is called to mark the fields indicated in fieldmask as needing | |
243 | * to be logged when the transaction is committed. The inode must | |
244 | * already be associated with the given transaction. | |
245 | * | |
246 | * The values for fieldmask are defined in xfs_inode_item.h. We always | |
247 | * log all of the core inode if any of it has changed, and we always log | |
248 | * all of the inline data/extents/b-tree root if any of them has changed. | |
249 | */ | |
250 | void | |
251 | xfs_trans_log_inode( | |
252 | xfs_trans_t *tp, | |
253 | xfs_inode_t *ip, | |
254 | uint flags) | |
255 | { | |
256 | xfs_log_item_desc_t *lidp; | |
257 | ||
258 | ASSERT(ip->i_transp == tp); | |
259 | ASSERT(ip->i_itemp != NULL); | |
260 | ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE)); | |
261 | ||
262 | lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)(ip->i_itemp)); | |
263 | ASSERT(lidp != NULL); | |
264 | ||
265 | tp->t_flags |= XFS_TRANS_DIRTY; | |
266 | lidp->lid_flags |= XFS_LID_DIRTY; | |
267 | ||
268 | /* | |
269 | * Always OR in the bits from the ili_last_fields field. | |
270 | * This is to coordinate with the xfs_iflush() and xfs_iflush_done() | |
271 | * routines in the eventual clearing of the ilf_fields bits. | |
272 | * See the big comment in xfs_iflush() for an explanation of | |
c41564b5 | 273 | * this coordination mechanism. |
1da177e4 LT |
274 | */ |
275 | flags |= ip->i_itemp->ili_last_fields; | |
276 | ip->i_itemp->ili_format.ilf_fields |= flags; | |
277 | } | |
278 | ||
279 | #ifdef XFS_TRANS_DEBUG | |
280 | /* | |
281 | * Keep track of the state of the inode btree root to make sure we | |
282 | * log it properly. | |
283 | */ | |
284 | STATIC void | |
285 | xfs_trans_inode_broot_debug( | |
286 | xfs_inode_t *ip) | |
287 | { | |
288 | xfs_inode_log_item_t *iip; | |
289 | ||
290 | ASSERT(ip->i_itemp != NULL); | |
291 | iip = ip->i_itemp; | |
292 | if (iip->ili_root_size != 0) { | |
293 | ASSERT(iip->ili_orig_root != NULL); | |
294 | kmem_free(iip->ili_orig_root, iip->ili_root_size); | |
295 | iip->ili_root_size = 0; | |
296 | iip->ili_orig_root = NULL; | |
297 | } | |
298 | if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) { | |
299 | ASSERT((ip->i_df.if_broot != NULL) && | |
300 | (ip->i_df.if_broot_bytes > 0)); | |
301 | iip->ili_root_size = ip->i_df.if_broot_bytes; | |
302 | iip->ili_orig_root = | |
303 | (char*)kmem_alloc(iip->ili_root_size, KM_SLEEP); | |
304 | memcpy(iip->ili_orig_root, (char*)(ip->i_df.if_broot), | |
305 | iip->ili_root_size); | |
306 | } | |
307 | } | |
308 | #endif |