Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2002,2005 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" | |
a844f451 | 26 | #include "xfs_ag.h" |
1da177e4 LT |
27 | #include "xfs_dir2.h" |
28 | #include "xfs_dmapi.h" | |
29 | #include "xfs_mount.h" | |
30 | #include "xfs_bmap_btree.h" | |
1da177e4 | 31 | #include "xfs_dir2_sf.h" |
a844f451 | 32 | #include "xfs_attr_sf.h" |
1da177e4 | 33 | #include "xfs_dinode.h" |
1da177e4 | 34 | #include "xfs_inode.h" |
a844f451 | 35 | #include "xfs_inode_item.h" |
1da177e4 LT |
36 | #include "xfs_bmap.h" |
37 | #include "xfs_error.h" | |
38 | #include "xfs_quota.h" | |
39 | #include "xfs_rw.h" | |
40 | #include "xfs_itable.h" | |
41 | #include "xfs_utils.h" | |
42 | ||
1da177e4 | 43 | |
1da177e4 LT |
44 | /* |
45 | * Allocates a new inode from disk and return a pointer to the | |
46 | * incore copy. This routine will internally commit the current | |
47 | * transaction and allocate a new one if the Space Manager needed | |
48 | * to do an allocation to replenish the inode free-list. | |
49 | * | |
50 | * This routine is designed to be called from xfs_create and | |
51 | * xfs_create_dir. | |
52 | * | |
53 | */ | |
54 | int | |
55 | xfs_dir_ialloc( | |
56 | xfs_trans_t **tpp, /* input: current transaction; | |
57 | output: may be a new transaction. */ | |
58 | xfs_inode_t *dp, /* directory within whose allocate | |
59 | the inode. */ | |
60 | mode_t mode, | |
31b084ae | 61 | xfs_nlink_t nlink, |
1da177e4 LT |
62 | xfs_dev_t rdev, |
63 | cred_t *credp, | |
64 | prid_t prid, /* project id */ | |
65 | int okalloc, /* ok to allocate new space */ | |
66 | xfs_inode_t **ipp, /* pointer to inode; it will be | |
67 | locked. */ | |
68 | int *committed) | |
69 | ||
70 | { | |
71 | xfs_trans_t *tp; | |
72 | xfs_trans_t *ntp; | |
73 | xfs_inode_t *ip; | |
74 | xfs_buf_t *ialloc_context = NULL; | |
75 | boolean_t call_again = B_FALSE; | |
76 | int code; | |
77 | uint log_res; | |
78 | uint log_count; | |
79 | void *dqinfo; | |
80 | uint tflags; | |
81 | ||
82 | tp = *tpp; | |
83 | ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); | |
84 | ||
85 | /* | |
86 | * xfs_ialloc will return a pointer to an incore inode if | |
87 | * the Space Manager has an available inode on the free | |
88 | * list. Otherwise, it will do an allocation and replenish | |
89 | * the freelist. Since we can only do one allocation per | |
90 | * transaction without deadlocks, we will need to commit the | |
91 | * current transaction and start a new one. We will then | |
92 | * need to call xfs_ialloc again to get the inode. | |
93 | * | |
94 | * If xfs_ialloc did an allocation to replenish the freelist, | |
95 | * it returns the bp containing the head of the freelist as | |
96 | * ialloc_context. We will hold a lock on it across the | |
97 | * transaction commit so that no other process can steal | |
98 | * the inode(s) that we've just allocated. | |
99 | */ | |
100 | code = xfs_ialloc(tp, dp, mode, nlink, rdev, credp, prid, okalloc, | |
101 | &ialloc_context, &call_again, &ip); | |
102 | ||
103 | /* | |
104 | * Return an error if we were unable to allocate a new inode. | |
105 | * This should only happen if we run out of space on disk or | |
106 | * encounter a disk error. | |
107 | */ | |
108 | if (code) { | |
109 | *ipp = NULL; | |
110 | return code; | |
111 | } | |
112 | if (!call_again && (ip == NULL)) { | |
113 | *ipp = NULL; | |
114 | return XFS_ERROR(ENOSPC); | |
115 | } | |
116 | ||
117 | /* | |
118 | * If call_again is set, then we were unable to get an | |
119 | * inode in one operation. We need to commit the current | |
120 | * transaction and call xfs_ialloc() again. It is guaranteed | |
121 | * to succeed the second time. | |
122 | */ | |
123 | if (call_again) { | |
124 | ||
125 | /* | |
126 | * Normally, xfs_trans_commit releases all the locks. | |
127 | * We call bhold to hang on to the ialloc_context across | |
128 | * the commit. Holding this buffer prevents any other | |
129 | * processes from doing any allocations in this | |
130 | * allocation group. | |
131 | */ | |
132 | xfs_trans_bhold(tp, ialloc_context); | |
133 | /* | |
134 | * Save the log reservation so we can use | |
135 | * them in the next transaction. | |
136 | */ | |
137 | log_res = xfs_trans_get_log_res(tp); | |
138 | log_count = xfs_trans_get_log_count(tp); | |
139 | ||
140 | /* | |
141 | * We want the quota changes to be associated with the next | |
142 | * transaction, NOT this one. So, detach the dqinfo from this | |
143 | * and attach it to the next transaction. | |
144 | */ | |
145 | dqinfo = NULL; | |
146 | tflags = 0; | |
147 | if (tp->t_dqinfo) { | |
148 | dqinfo = (void *)tp->t_dqinfo; | |
149 | tp->t_dqinfo = NULL; | |
150 | tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY; | |
151 | tp->t_flags &= ~(XFS_TRANS_DQ_DIRTY); | |
152 | } | |
153 | ||
154 | ntp = xfs_trans_dup(tp); | |
1c72bf90 | 155 | code = xfs_trans_commit(tp, 0); |
1da177e4 LT |
156 | tp = ntp; |
157 | if (committed != NULL) { | |
158 | *committed = 1; | |
159 | } | |
160 | /* | |
161 | * If we get an error during the commit processing, | |
162 | * release the buffer that is still held and return | |
163 | * to the caller. | |
164 | */ | |
165 | if (code) { | |
166 | xfs_buf_relse(ialloc_context); | |
167 | if (dqinfo) { | |
168 | tp->t_dqinfo = dqinfo; | |
169 | XFS_TRANS_FREE_DQINFO(tp->t_mountp, tp); | |
170 | } | |
171 | *tpp = ntp; | |
172 | *ipp = NULL; | |
173 | return code; | |
174 | } | |
cc09c0dc DC |
175 | |
176 | /* | |
177 | * transaction commit worked ok so we can drop the extra ticket | |
178 | * reference that we gained in xfs_trans_dup() | |
179 | */ | |
180 | xfs_log_ticket_put(tp->t_ticket); | |
1da177e4 LT |
181 | code = xfs_trans_reserve(tp, 0, log_res, 0, |
182 | XFS_TRANS_PERM_LOG_RES, log_count); | |
183 | /* | |
184 | * Re-attach the quota info that we detached from prev trx. | |
185 | */ | |
186 | if (dqinfo) { | |
187 | tp->t_dqinfo = dqinfo; | |
188 | tp->t_flags |= tflags; | |
189 | } | |
190 | ||
191 | if (code) { | |
192 | xfs_buf_relse(ialloc_context); | |
193 | *tpp = ntp; | |
194 | *ipp = NULL; | |
195 | return code; | |
196 | } | |
197 | xfs_trans_bjoin(tp, ialloc_context); | |
198 | ||
199 | /* | |
200 | * Call ialloc again. Since we've locked out all | |
201 | * other allocations in this allocation group, | |
202 | * this call should always succeed. | |
203 | */ | |
204 | code = xfs_ialloc(tp, dp, mode, nlink, rdev, credp, prid, | |
205 | okalloc, &ialloc_context, &call_again, &ip); | |
206 | ||
207 | /* | |
208 | * If we get an error at this point, return to the caller | |
209 | * so that the current transaction can be aborted. | |
210 | */ | |
211 | if (code) { | |
212 | *tpp = tp; | |
213 | *ipp = NULL; | |
214 | return code; | |
215 | } | |
216 | ASSERT ((!call_again) && (ip != NULL)); | |
217 | ||
218 | } else { | |
219 | if (committed != NULL) { | |
220 | *committed = 0; | |
221 | } | |
222 | } | |
223 | ||
224 | *ipp = ip; | |
225 | *tpp = tp; | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | /* | |
231 | * Decrement the link count on an inode & log the change. | |
232 | * If this causes the link count to go to zero, initiate the | |
233 | * logging activity required to truncate a file. | |
234 | */ | |
235 | int /* error */ | |
236 | xfs_droplink( | |
237 | xfs_trans_t *tp, | |
238 | xfs_inode_t *ip) | |
239 | { | |
240 | int error; | |
241 | ||
242 | xfs_ichgtime(ip, XFS_ICHGTIME_CHG); | |
243 | ||
244 | ASSERT (ip->i_d.di_nlink > 0); | |
245 | ip->i_d.di_nlink--; | |
01651646 | 246 | drop_nlink(VFS_I(ip)); |
1da177e4 LT |
247 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
248 | ||
249 | error = 0; | |
250 | if (ip->i_d.di_nlink == 0) { | |
251 | /* | |
252 | * We're dropping the last link to this file. | |
253 | * Move the on-disk inode to the AGI unlinked list. | |
254 | * From xfs_inactive() we will pull the inode from | |
255 | * the list and free it. | |
256 | */ | |
257 | error = xfs_iunlink(tp, ip); | |
258 | } | |
259 | return error; | |
260 | } | |
261 | ||
262 | /* | |
263 | * This gets called when the inode's version needs to be changed from 1 to 2. | |
264 | * Currently this happens when the nlink field overflows the old 16-bit value | |
265 | * or when chproj is called to change the project for the first time. | |
266 | * As a side effect the superblock version will also get rev'd | |
267 | * to contain the NLINK bit. | |
268 | */ | |
269 | void | |
270 | xfs_bump_ino_vers2( | |
271 | xfs_trans_t *tp, | |
272 | xfs_inode_t *ip) | |
273 | { | |
274 | xfs_mount_t *mp; | |
1da177e4 | 275 | |
579aa9ca | 276 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
51ce16d5 | 277 | ASSERT(ip->i_d.di_version == 1); |
1da177e4 | 278 | |
51ce16d5 | 279 | ip->i_d.di_version = 2; |
1da177e4 LT |
280 | ip->i_d.di_onlink = 0; |
281 | memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad)); | |
282 | mp = tp->t_mountp; | |
62118709 | 283 | if (!xfs_sb_version_hasnlink(&mp->m_sb)) { |
3685c2a1 | 284 | spin_lock(&mp->m_sb_lock); |
62118709 ES |
285 | if (!xfs_sb_version_hasnlink(&mp->m_sb)) { |
286 | xfs_sb_version_addnlink(&mp->m_sb); | |
3685c2a1 | 287 | spin_unlock(&mp->m_sb_lock); |
1da177e4 LT |
288 | xfs_mod_sb(tp, XFS_SB_VERSIONNUM); |
289 | } else { | |
3685c2a1 | 290 | spin_unlock(&mp->m_sb_lock); |
1da177e4 LT |
291 | } |
292 | } | |
293 | /* Caller must log the inode */ | |
294 | } | |
295 | ||
296 | /* | |
297 | * Increment the link count on an inode & log the change. | |
298 | */ | |
299 | int | |
300 | xfs_bumplink( | |
301 | xfs_trans_t *tp, | |
302 | xfs_inode_t *ip) | |
303 | { | |
304 | if (ip->i_d.di_nlink >= XFS_MAXLINK) | |
305 | return XFS_ERROR(EMLINK); | |
306 | xfs_ichgtime(ip, XFS_ICHGTIME_CHG); | |
307 | ||
308 | ASSERT(ip->i_d.di_nlink > 0); | |
309 | ip->i_d.di_nlink++; | |
01651646 | 310 | inc_nlink(VFS_I(ip)); |
51ce16d5 | 311 | if ((ip->i_d.di_version == 1) && |
1da177e4 LT |
312 | (ip->i_d.di_nlink > XFS_MAXLINK_1)) { |
313 | /* | |
314 | * The inode has increased its number of links beyond | |
315 | * what can fit in an old format inode. It now needs | |
316 | * to be converted to a version 2 inode with a 32 bit | |
317 | * link count. If this is the first inode in the file | |
318 | * system to do this, then we need to bump the superblock | |
319 | * version number as well. | |
320 | */ | |
321 | xfs_bump_ino_vers2(tp, ip); | |
322 | } | |
323 | ||
324 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
325 | return 0; | |
326 | } | |
327 | ||
328 | /* | |
329 | * Try to truncate the given file to 0 length. Currently called | |
330 | * only out of xfs_remove when it has to truncate a file to free | |
331 | * up space for the remove to proceed. | |
332 | */ | |
333 | int | |
334 | xfs_truncate_file( | |
335 | xfs_mount_t *mp, | |
336 | xfs_inode_t *ip) | |
337 | { | |
338 | xfs_trans_t *tp; | |
339 | int error; | |
340 | ||
341 | #ifdef QUOTADEBUG | |
342 | /* | |
343 | * This is called to truncate the quotainodes too. | |
344 | */ | |
345 | if (XFS_IS_UQUOTA_ON(mp)) { | |
346 | if (ip->i_ino != mp->m_sb.sb_uquotino) | |
347 | ASSERT(ip->i_udquot); | |
348 | } | |
c8ad20ff | 349 | if (XFS_IS_OQUOTA_ON(mp)) { |
1da177e4 LT |
350 | if (ip->i_ino != mp->m_sb.sb_gquotino) |
351 | ASSERT(ip->i_gdquot); | |
352 | } | |
353 | #endif | |
354 | /* | |
355 | * Make the call to xfs_itruncate_start before starting the | |
356 | * transaction, because we cannot make the call while we're | |
357 | * in a transaction. | |
358 | */ | |
359 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
d3cf2094 LM |
360 | error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, (xfs_fsize_t)0); |
361 | if (error) { | |
362 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
363 | return error; | |
364 | } | |
1da177e4 LT |
365 | |
366 | tp = xfs_trans_alloc(mp, XFS_TRANS_TRUNCATE_FILE); | |
367 | if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, | |
368 | XFS_TRANS_PERM_LOG_RES, | |
369 | XFS_ITRUNCATE_LOG_COUNT))) { | |
370 | xfs_trans_cancel(tp, 0); | |
371 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
372 | return error; | |
373 | } | |
374 | ||
375 | /* | |
376 | * Follow the normal truncate locking protocol. Since we | |
9da096fd | 377 | * hold the inode in the transaction, we know that its number |
1da177e4 LT |
378 | * of references will stay constant. |
379 | */ | |
380 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
381 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
382 | xfs_trans_ihold(tp, ip); | |
383 | /* | |
384 | * Signal a sync xaction. The only case where that isn't | |
385 | * the case is if we're truncating an already unlinked file | |
386 | * on a wsync fs. In that case, we know the blocks can't | |
387 | * reappear in the file because the links to file are | |
388 | * permanently toast. Currently, we're always going to | |
389 | * want a sync transaction because this code is being | |
390 | * called from places where nlink is guaranteed to be 1 | |
391 | * but I'm leaving the tests in to protect against future | |
392 | * changes -- rcc. | |
393 | */ | |
394 | error = xfs_itruncate_finish(&tp, ip, (xfs_fsize_t)0, | |
395 | XFS_DATA_FORK, | |
396 | ((ip->i_d.di_nlink != 0 || | |
397 | !(mp->m_flags & XFS_MOUNT_WSYNC)) | |
398 | ? 1 : 0)); | |
399 | if (error) { | |
400 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | | |
401 | XFS_TRANS_ABORT); | |
402 | } else { | |
403 | xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
1c72bf90 | 404 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
1da177e4 LT |
405 | } |
406 | xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
407 | ||
408 | return error; | |
409 | } |