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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 | 27 | #include "xfs_dir2.h" |
1da177e4 LT |
28 | #include "xfs_mount.h" |
29 | #include "xfs_bmap_btree.h" | |
1da177e4 | 30 | #include "xfs_dinode.h" |
1da177e4 | 31 | #include "xfs_inode.h" |
a844f451 | 32 | #include "xfs_inode_item.h" |
1da177e4 LT |
33 | #include "xfs_bmap.h" |
34 | #include "xfs_error.h" | |
35 | #include "xfs_quota.h" | |
1da177e4 LT |
36 | #include "xfs_itable.h" |
37 | #include "xfs_utils.h" | |
38 | ||
1da177e4 | 39 | |
1da177e4 LT |
40 | /* |
41 | * Allocates a new inode from disk and return a pointer to the | |
42 | * incore copy. This routine will internally commit the current | |
43 | * transaction and allocate a new one if the Space Manager needed | |
44 | * to do an allocation to replenish the inode free-list. | |
45 | * | |
46 | * This routine is designed to be called from xfs_create and | |
47 | * xfs_create_dir. | |
48 | * | |
49 | */ | |
50 | int | |
51 | xfs_dir_ialloc( | |
52 | xfs_trans_t **tpp, /* input: current transaction; | |
53 | output: may be a new transaction. */ | |
54 | xfs_inode_t *dp, /* directory within whose allocate | |
55 | the inode. */ | |
56 | mode_t mode, | |
31b084ae | 57 | xfs_nlink_t nlink, |
1da177e4 LT |
58 | xfs_dev_t rdev, |
59 | cred_t *credp, | |
60 | prid_t prid, /* project id */ | |
61 | int okalloc, /* ok to allocate new space */ | |
62 | xfs_inode_t **ipp, /* pointer to inode; it will be | |
63 | locked. */ | |
64 | int *committed) | |
65 | ||
66 | { | |
67 | xfs_trans_t *tp; | |
68 | xfs_trans_t *ntp; | |
69 | xfs_inode_t *ip; | |
70 | xfs_buf_t *ialloc_context = NULL; | |
71 | boolean_t call_again = B_FALSE; | |
72 | int code; | |
73 | uint log_res; | |
74 | uint log_count; | |
75 | void *dqinfo; | |
76 | uint tflags; | |
77 | ||
78 | tp = *tpp; | |
79 | ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); | |
80 | ||
81 | /* | |
82 | * xfs_ialloc will return a pointer to an incore inode if | |
83 | * the Space Manager has an available inode on the free | |
84 | * list. Otherwise, it will do an allocation and replenish | |
85 | * the freelist. Since we can only do one allocation per | |
86 | * transaction without deadlocks, we will need to commit the | |
87 | * current transaction and start a new one. We will then | |
88 | * need to call xfs_ialloc again to get the inode. | |
89 | * | |
90 | * If xfs_ialloc did an allocation to replenish the freelist, | |
91 | * it returns the bp containing the head of the freelist as | |
92 | * ialloc_context. We will hold a lock on it across the | |
93 | * transaction commit so that no other process can steal | |
94 | * the inode(s) that we've just allocated. | |
95 | */ | |
96 | code = xfs_ialloc(tp, dp, mode, nlink, rdev, credp, prid, okalloc, | |
97 | &ialloc_context, &call_again, &ip); | |
98 | ||
99 | /* | |
100 | * Return an error if we were unable to allocate a new inode. | |
101 | * This should only happen if we run out of space on disk or | |
102 | * encounter a disk error. | |
103 | */ | |
104 | if (code) { | |
105 | *ipp = NULL; | |
106 | return code; | |
107 | } | |
108 | if (!call_again && (ip == NULL)) { | |
109 | *ipp = NULL; | |
110 | return XFS_ERROR(ENOSPC); | |
111 | } | |
112 | ||
113 | /* | |
114 | * If call_again is set, then we were unable to get an | |
115 | * inode in one operation. We need to commit the current | |
116 | * transaction and call xfs_ialloc() again. It is guaranteed | |
117 | * to succeed the second time. | |
118 | */ | |
119 | if (call_again) { | |
120 | ||
121 | /* | |
122 | * Normally, xfs_trans_commit releases all the locks. | |
123 | * We call bhold to hang on to the ialloc_context across | |
124 | * the commit. Holding this buffer prevents any other | |
125 | * processes from doing any allocations in this | |
126 | * allocation group. | |
127 | */ | |
128 | xfs_trans_bhold(tp, ialloc_context); | |
129 | /* | |
130 | * Save the log reservation so we can use | |
131 | * them in the next transaction. | |
132 | */ | |
133 | log_res = xfs_trans_get_log_res(tp); | |
134 | log_count = xfs_trans_get_log_count(tp); | |
135 | ||
136 | /* | |
137 | * We want the quota changes to be associated with the next | |
138 | * transaction, NOT this one. So, detach the dqinfo from this | |
139 | * and attach it to the next transaction. | |
140 | */ | |
141 | dqinfo = NULL; | |
142 | tflags = 0; | |
143 | if (tp->t_dqinfo) { | |
144 | dqinfo = (void *)tp->t_dqinfo; | |
145 | tp->t_dqinfo = NULL; | |
146 | tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY; | |
147 | tp->t_flags &= ~(XFS_TRANS_DQ_DIRTY); | |
148 | } | |
149 | ||
150 | ntp = xfs_trans_dup(tp); | |
1c72bf90 | 151 | code = xfs_trans_commit(tp, 0); |
1da177e4 LT |
152 | tp = ntp; |
153 | if (committed != NULL) { | |
154 | *committed = 1; | |
155 | } | |
156 | /* | |
157 | * If we get an error during the commit processing, | |
158 | * release the buffer that is still held and return | |
159 | * to the caller. | |
160 | */ | |
161 | if (code) { | |
162 | xfs_buf_relse(ialloc_context); | |
163 | if (dqinfo) { | |
164 | tp->t_dqinfo = dqinfo; | |
7d095257 | 165 | xfs_trans_free_dqinfo(tp); |
1da177e4 LT |
166 | } |
167 | *tpp = ntp; | |
168 | *ipp = NULL; | |
169 | return code; | |
170 | } | |
cc09c0dc DC |
171 | |
172 | /* | |
173 | * transaction commit worked ok so we can drop the extra ticket | |
174 | * reference that we gained in xfs_trans_dup() | |
175 | */ | |
176 | xfs_log_ticket_put(tp->t_ticket); | |
1da177e4 LT |
177 | code = xfs_trans_reserve(tp, 0, log_res, 0, |
178 | XFS_TRANS_PERM_LOG_RES, log_count); | |
179 | /* | |
180 | * Re-attach the quota info that we detached from prev trx. | |
181 | */ | |
182 | if (dqinfo) { | |
183 | tp->t_dqinfo = dqinfo; | |
184 | tp->t_flags |= tflags; | |
185 | } | |
186 | ||
187 | if (code) { | |
188 | xfs_buf_relse(ialloc_context); | |
189 | *tpp = ntp; | |
190 | *ipp = NULL; | |
191 | return code; | |
192 | } | |
193 | xfs_trans_bjoin(tp, ialloc_context); | |
194 | ||
195 | /* | |
196 | * Call ialloc again. Since we've locked out all | |
197 | * other allocations in this allocation group, | |
198 | * this call should always succeed. | |
199 | */ | |
200 | code = xfs_ialloc(tp, dp, mode, nlink, rdev, credp, prid, | |
201 | okalloc, &ialloc_context, &call_again, &ip); | |
202 | ||
203 | /* | |
204 | * If we get an error at this point, return to the caller | |
205 | * so that the current transaction can be aborted. | |
206 | */ | |
207 | if (code) { | |
208 | *tpp = tp; | |
209 | *ipp = NULL; | |
210 | return code; | |
211 | } | |
212 | ASSERT ((!call_again) && (ip != NULL)); | |
213 | ||
214 | } else { | |
215 | if (committed != NULL) { | |
216 | *committed = 0; | |
217 | } | |
218 | } | |
219 | ||
220 | *ipp = ip; | |
221 | *tpp = tp; | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | /* | |
227 | * Decrement the link count on an inode & log the change. | |
228 | * If this causes the link count to go to zero, initiate the | |
229 | * logging activity required to truncate a file. | |
230 | */ | |
231 | int /* error */ | |
232 | xfs_droplink( | |
233 | xfs_trans_t *tp, | |
234 | xfs_inode_t *ip) | |
235 | { | |
236 | int error; | |
237 | ||
238 | xfs_ichgtime(ip, XFS_ICHGTIME_CHG); | |
239 | ||
240 | ASSERT (ip->i_d.di_nlink > 0); | |
241 | ip->i_d.di_nlink--; | |
01651646 | 242 | drop_nlink(VFS_I(ip)); |
1da177e4 LT |
243 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
244 | ||
245 | error = 0; | |
246 | if (ip->i_d.di_nlink == 0) { | |
247 | /* | |
248 | * We're dropping the last link to this file. | |
249 | * Move the on-disk inode to the AGI unlinked list. | |
250 | * From xfs_inactive() we will pull the inode from | |
251 | * the list and free it. | |
252 | */ | |
253 | error = xfs_iunlink(tp, ip); | |
254 | } | |
255 | return error; | |
256 | } | |
257 | ||
258 | /* | |
259 | * This gets called when the inode's version needs to be changed from 1 to 2. | |
260 | * Currently this happens when the nlink field overflows the old 16-bit value | |
261 | * or when chproj is called to change the project for the first time. | |
262 | * As a side effect the superblock version will also get rev'd | |
263 | * to contain the NLINK bit. | |
264 | */ | |
265 | void | |
266 | xfs_bump_ino_vers2( | |
267 | xfs_trans_t *tp, | |
268 | xfs_inode_t *ip) | |
269 | { | |
270 | xfs_mount_t *mp; | |
1da177e4 | 271 | |
579aa9ca | 272 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
51ce16d5 | 273 | ASSERT(ip->i_d.di_version == 1); |
1da177e4 | 274 | |
51ce16d5 | 275 | ip->i_d.di_version = 2; |
1da177e4 LT |
276 | ip->i_d.di_onlink = 0; |
277 | memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad)); | |
278 | mp = tp->t_mountp; | |
62118709 | 279 | if (!xfs_sb_version_hasnlink(&mp->m_sb)) { |
3685c2a1 | 280 | spin_lock(&mp->m_sb_lock); |
62118709 ES |
281 | if (!xfs_sb_version_hasnlink(&mp->m_sb)) { |
282 | xfs_sb_version_addnlink(&mp->m_sb); | |
3685c2a1 | 283 | spin_unlock(&mp->m_sb_lock); |
1da177e4 LT |
284 | xfs_mod_sb(tp, XFS_SB_VERSIONNUM); |
285 | } else { | |
3685c2a1 | 286 | spin_unlock(&mp->m_sb_lock); |
1da177e4 LT |
287 | } |
288 | } | |
289 | /* Caller must log the inode */ | |
290 | } | |
291 | ||
292 | /* | |
293 | * Increment the link count on an inode & log the change. | |
294 | */ | |
295 | int | |
296 | xfs_bumplink( | |
297 | xfs_trans_t *tp, | |
298 | xfs_inode_t *ip) | |
299 | { | |
300 | if (ip->i_d.di_nlink >= XFS_MAXLINK) | |
301 | return XFS_ERROR(EMLINK); | |
302 | xfs_ichgtime(ip, XFS_ICHGTIME_CHG); | |
303 | ||
304 | ASSERT(ip->i_d.di_nlink > 0); | |
305 | ip->i_d.di_nlink++; | |
01651646 | 306 | inc_nlink(VFS_I(ip)); |
51ce16d5 | 307 | if ((ip->i_d.di_version == 1) && |
1da177e4 LT |
308 | (ip->i_d.di_nlink > XFS_MAXLINK_1)) { |
309 | /* | |
310 | * The inode has increased its number of links beyond | |
311 | * what can fit in an old format inode. It now needs | |
312 | * to be converted to a version 2 inode with a 32 bit | |
313 | * link count. If this is the first inode in the file | |
314 | * system to do this, then we need to bump the superblock | |
315 | * version number as well. | |
316 | */ | |
317 | xfs_bump_ino_vers2(tp, ip); | |
318 | } | |
319 | ||
320 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
321 | return 0; | |
322 | } |