]>
Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
3e57ecf6 | 2 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
7b718769 | 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" | |
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 | 37 | #include "xfs_inode_item.h" |
1da177e4 | 38 | #include "xfs_bmap.h" |
a844f451 | 39 | #include "xfs_btree.h" |
1da177e4 LT |
40 | #include "xfs_ialloc.h" |
41 | #include "xfs_itable.h" | |
42 | #include "xfs_dfrag.h" | |
43 | #include "xfs_error.h" | |
1da177e4 | 44 | #include "xfs_rw.h" |
739bfb2a | 45 | #include "xfs_vnodeops.h" |
1da177e4 LT |
46 | |
47 | /* | |
48 | * Syssgi interface for swapext | |
49 | */ | |
50 | int | |
51 | xfs_swapext( | |
743bb465 | 52 | xfs_swapext_t *sxp) |
1da177e4 | 53 | { |
35fec8df CH |
54 | xfs_inode_t *ip, *tip; |
55 | struct file *file, *target_file; | |
1da177e4 | 56 | int error = 0; |
1da177e4 | 57 | |
1da177e4 | 58 | /* Pull information for the target fd */ |
35fec8df CH |
59 | file = fget((int)sxp->sx_fdtarget); |
60 | if (!file) { | |
1da177e4 | 61 | error = XFS_ERROR(EINVAL); |
f0e0059b | 62 | goto out; |
1da177e4 LT |
63 | } |
64 | ||
f6aa7f21 CH |
65 | if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) { |
66 | error = XFS_ERROR(EBADF); | |
67 | goto out_put_file; | |
68 | } | |
69 | ||
35fec8df CH |
70 | target_file = fget((int)sxp->sx_fdtmp); |
71 | if (!target_file) { | |
1da177e4 | 72 | error = XFS_ERROR(EINVAL); |
35fec8df | 73 | goto out_put_file; |
1da177e4 LT |
74 | } |
75 | ||
f6aa7f21 CH |
76 | if (!(target_file->f_mode & FMODE_WRITE) || |
77 | (target_file->f_flags & O_APPEND)) { | |
78 | error = XFS_ERROR(EBADF); | |
79 | goto out_put_target_file; | |
80 | } | |
81 | ||
35fec8df CH |
82 | ip = XFS_I(file->f_path.dentry->d_inode); |
83 | tip = XFS_I(target_file->f_path.dentry->d_inode); | |
1da177e4 LT |
84 | |
85 | if (ip->i_mount != tip->i_mount) { | |
35fec8df CH |
86 | error = XFS_ERROR(EINVAL); |
87 | goto out_put_target_file; | |
1da177e4 LT |
88 | } |
89 | ||
90 | if (ip->i_ino == tip->i_ino) { | |
35fec8df CH |
91 | error = XFS_ERROR(EINVAL); |
92 | goto out_put_target_file; | |
1da177e4 LT |
93 | } |
94 | ||
35fec8df CH |
95 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
96 | error = XFS_ERROR(EIO); | |
97 | goto out_put_target_file; | |
1da177e4 LT |
98 | } |
99 | ||
541d7d3c | 100 | error = xfs_swap_extents(ip, tip, sxp); |
3e57ecf6 | 101 | |
35fec8df CH |
102 | out_put_target_file: |
103 | fput(target_file); | |
104 | out_put_file: | |
105 | fput(file); | |
35fec8df | 106 | out: |
3e57ecf6 OW |
107 | return error; |
108 | } | |
109 | ||
110 | int | |
111 | xfs_swap_extents( | |
112 | xfs_inode_t *ip, | |
113 | xfs_inode_t *tip, | |
114 | xfs_swapext_t *sxp) | |
115 | { | |
116 | xfs_mount_t *mp; | |
3e57ecf6 OW |
117 | xfs_trans_t *tp; |
118 | xfs_bstat_t *sbp = &sxp->sx_stat; | |
3e57ecf6 OW |
119 | xfs_ifork_t *tempifp, *ifp, *tifp; |
120 | int ilf_fields, tilf_fields; | |
121 | static uint lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL; | |
122 | int error = 0; | |
123 | int aforkblks = 0; | |
124 | int taforkblks = 0; | |
125 | __uint64_t tmp; | |
126 | char locked = 0; | |
127 | ||
128 | mp = ip->i_mount; | |
129 | ||
130 | tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL); | |
131 | if (!tempifp) { | |
132 | error = XFS_ERROR(ENOMEM); | |
133 | goto error0; | |
134 | } | |
135 | ||
136 | sbp = &sxp->sx_stat; | |
1da177e4 | 137 | |
f9114eba DC |
138 | /* |
139 | * we have to do two separate lock calls here to keep lockdep | |
140 | * happy. If we try to get all the locks in one call, lock will | |
141 | * report false positives when we drop the ILOCK and regain them | |
142 | * below. | |
143 | */ | |
144 | xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL); | |
145 | xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL); | |
3e57ecf6 | 146 | locked = 1; |
1da177e4 | 147 | |
1da177e4 LT |
148 | /* Verify that both files have the same format */ |
149 | if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) { | |
150 | error = XFS_ERROR(EINVAL); | |
151 | goto error0; | |
152 | } | |
153 | ||
154 | /* Verify both files are either real-time or non-realtime */ | |
71ddabb9 | 155 | if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) { |
1da177e4 LT |
156 | error = XFS_ERROR(EINVAL); |
157 | goto error0; | |
158 | } | |
159 | ||
160 | /* Should never get a local format */ | |
161 | if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL || | |
162 | tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) { | |
163 | error = XFS_ERROR(EINVAL); | |
164 | goto error0; | |
165 | } | |
166 | ||
df80c933 | 167 | if (VN_CACHED(VFS_I(tip)) != 0) { |
613d7043 | 168 | xfs_inval_cached_trace(tip, 0, -1, 0, -1); |
739bfb2a CH |
169 | error = xfs_flushinval_pages(tip, 0, -1, |
170 | FI_REMAPF_LOCKED); | |
d3cf2094 LM |
171 | if (error) |
172 | goto error0; | |
bd5a876a | 173 | } |
1da177e4 LT |
174 | |
175 | /* Verify O_DIRECT for ftmp */ | |
df80c933 | 176 | if (VN_CACHED(VFS_I(tip)) != 0) { |
1da177e4 LT |
177 | error = XFS_ERROR(EINVAL); |
178 | goto error0; | |
179 | } | |
180 | ||
181 | /* Verify all data are being swapped */ | |
d0cfb373 ES |
182 | if (sxp->sx_offset != 0 || |
183 | sxp->sx_length != ip->i_d.di_size || | |
184 | sxp->sx_length != tip->i_d.di_size) { | |
1da177e4 LT |
185 | error = XFS_ERROR(EFAULT); |
186 | goto error0; | |
187 | } | |
188 | ||
189 | /* | |
190 | * If the target has extended attributes, the tmp file | |
191 | * must also in order to ensure the correct data fork | |
192 | * format. | |
193 | */ | |
194 | if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) { | |
195 | error = XFS_ERROR(EINVAL); | |
196 | goto error0; | |
197 | } | |
198 | ||
199 | /* | |
200 | * Compare the current change & modify times with that | |
201 | * passed in. If they differ, we abort this swap. | |
202 | * This is the mechanism used to ensure the calling | |
203 | * process that the file was not changed out from | |
204 | * under it. | |
205 | */ | |
206 | if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) || | |
207 | (sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) || | |
208 | (sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) || | |
209 | (sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) { | |
210 | error = XFS_ERROR(EBUSY); | |
211 | goto error0; | |
212 | } | |
213 | ||
214 | /* We need to fail if the file is memory mapped. Once we have tossed | |
215 | * all existing pages, the page fault will have no option | |
216 | * but to go to the filesystem for pages. By making the page fault call | |
67fcaa73 | 217 | * vop_read (or write in the case of autogrow) they block on the iolock |
1da177e4 LT |
218 | * until we have switched the extents. |
219 | */ | |
df80c933 | 220 | if (VN_MAPPED(VFS_I(ip))) { |
1da177e4 LT |
221 | error = XFS_ERROR(EBUSY); |
222 | goto error0; | |
223 | } | |
224 | ||
225 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
226 | xfs_iunlock(tip, XFS_ILOCK_EXCL); | |
227 | ||
228 | /* | |
229 | * There is a race condition here since we gave up the | |
230 | * ilock. However, the data fork will not change since | |
231 | * we have the iolock (locked for truncation too) so we | |
232 | * are safe. We don't really care if non-io related | |
233 | * fields change. | |
234 | */ | |
235 | ||
739bfb2a | 236 | xfs_tosspages(ip, 0, -1, FI_REMAPF); |
1da177e4 LT |
237 | |
238 | tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT); | |
239 | if ((error = xfs_trans_reserve(tp, 0, | |
240 | XFS_ICHANGE_LOG_RES(mp), 0, | |
241 | 0, 0))) { | |
242 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
243 | xfs_iunlock(tip, XFS_IOLOCK_EXCL); | |
244 | xfs_trans_cancel(tp, 0); | |
d0cfb373 ES |
245 | locked = 0; |
246 | goto error0; | |
1da177e4 | 247 | } |
e1cccd91 | 248 | xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL); |
1da177e4 LT |
249 | |
250 | /* | |
251 | * Count the number of extended attribute blocks | |
252 | */ | |
253 | if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) && | |
254 | (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { | |
255 | error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks); | |
256 | if (error) { | |
1da177e4 | 257 | xfs_trans_cancel(tp, 0); |
d0cfb373 | 258 | goto error0; |
1da177e4 LT |
259 | } |
260 | } | |
261 | if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) && | |
262 | (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { | |
263 | error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK, | |
264 | &taforkblks); | |
265 | if (error) { | |
1da177e4 | 266 | xfs_trans_cancel(tp, 0); |
d0cfb373 | 267 | goto error0; |
1da177e4 LT |
268 | } |
269 | } | |
270 | ||
271 | /* | |
272 | * Swap the data forks of the inodes | |
273 | */ | |
274 | ifp = &ip->i_df; | |
275 | tifp = &tip->i_df; | |
d0cfb373 ES |
276 | *tempifp = *ifp; /* struct copy */ |
277 | *ifp = *tifp; /* struct copy */ | |
278 | *tifp = *tempifp; /* struct copy */ | |
1da177e4 LT |
279 | |
280 | /* | |
281 | * Fix the on-disk inode values | |
282 | */ | |
283 | tmp = (__uint64_t)ip->i_d.di_nblocks; | |
284 | ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks; | |
285 | tip->i_d.di_nblocks = tmp + taforkblks - aforkblks; | |
286 | ||
287 | tmp = (__uint64_t) ip->i_d.di_nextents; | |
288 | ip->i_d.di_nextents = tip->i_d.di_nextents; | |
289 | tip->i_d.di_nextents = tmp; | |
290 | ||
291 | tmp = (__uint64_t) ip->i_d.di_format; | |
292 | ip->i_d.di_format = tip->i_d.di_format; | |
293 | tip->i_d.di_format = tmp; | |
294 | ||
295 | ilf_fields = XFS_ILOG_CORE; | |
296 | ||
297 | switch(ip->i_d.di_format) { | |
298 | case XFS_DINODE_FMT_EXTENTS: | |
299 | /* If the extents fit in the inode, fix the | |
300 | * pointer. Otherwise it's already NULL or | |
301 | * pointing to the extent. | |
302 | */ | |
303 | if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) { | |
304 | ifp->if_u1.if_extents = | |
305 | ifp->if_u2.if_inline_ext; | |
306 | } | |
307 | ilf_fields |= XFS_ILOG_DEXT; | |
308 | break; | |
309 | case XFS_DINODE_FMT_BTREE: | |
310 | ilf_fields |= XFS_ILOG_DBROOT; | |
311 | break; | |
312 | } | |
313 | ||
314 | tilf_fields = XFS_ILOG_CORE; | |
315 | ||
316 | switch(tip->i_d.di_format) { | |
317 | case XFS_DINODE_FMT_EXTENTS: | |
318 | /* If the extents fit in the inode, fix the | |
319 | * pointer. Otherwise it's already NULL or | |
320 | * pointing to the extent. | |
321 | */ | |
322 | if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) { | |
323 | tifp->if_u1.if_extents = | |
324 | tifp->if_u2.if_inline_ext; | |
325 | } | |
326 | tilf_fields |= XFS_ILOG_DEXT; | |
327 | break; | |
328 | case XFS_DINODE_FMT_BTREE: | |
329 | tilf_fields |= XFS_ILOG_DBROOT; | |
330 | break; | |
331 | } | |
332 | ||
1da177e4 | 333 | |
0b1f9177 | 334 | IHOLD(ip); |
1da177e4 | 335 | xfs_trans_ijoin(tp, ip, lock_flags); |
0b1f9177 CH |
336 | |
337 | IHOLD(tip); | |
1da177e4 LT |
338 | xfs_trans_ijoin(tp, tip, lock_flags); |
339 | ||
340 | xfs_trans_log_inode(tp, ip, ilf_fields); | |
341 | xfs_trans_log_inode(tp, tip, tilf_fields); | |
342 | ||
343 | /* | |
344 | * If this is a synchronous mount, make sure that the | |
345 | * transaction goes to disk before returning to the user. | |
346 | */ | |
347 | if (mp->m_flags & XFS_MOUNT_WSYNC) { | |
348 | xfs_trans_set_sync(tp); | |
349 | } | |
350 | ||
1c72bf90 | 351 | error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT); |
d0cfb373 | 352 | locked = 0; |
1da177e4 LT |
353 | |
354 | error0: | |
355 | if (locked) { | |
356 | xfs_iunlock(ip, lock_flags); | |
357 | xfs_iunlock(tip, lock_flags); | |
358 | } | |
d0cfb373 | 359 | if (tempifp != NULL) |
f0e2d93c | 360 | kmem_free(tempifp); |
1da177e4 LT |
361 | return error; |
362 | } |