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( | |
d0cfb373 | 52 | xfs_swapext_t __user *sxu) |
1da177e4 | 53 | { |
d0cfb373 | 54 | xfs_swapext_t *sxp; |
3e57ecf6 | 55 | xfs_inode_t *ip=NULL, *tip=NULL; |
1da177e4 | 56 | xfs_mount_t *mp; |
1da177e4 | 57 | struct file *fp = NULL, *tfp = NULL; |
67fcaa73 | 58 | bhv_vnode_t *vp, *tvp; |
1da177e4 | 59 | int error = 0; |
1da177e4 | 60 | |
d0cfb373 | 61 | sxp = kmem_alloc(sizeof(xfs_swapext_t), KM_MAYFAIL); |
3e57ecf6 | 62 | if (!sxp) { |
d0cfb373 ES |
63 | error = XFS_ERROR(ENOMEM); |
64 | goto error0; | |
65 | } | |
66 | ||
67 | if (copy_from_user(sxp, sxu, sizeof(xfs_swapext_t))) { | |
68 | error = XFS_ERROR(EFAULT); | |
69 | goto error0; | |
70 | } | |
1da177e4 LT |
71 | |
72 | /* Pull information for the target fd */ | |
d0cfb373 | 73 | if (((fp = fget((int)sxp->sx_fdtarget)) == NULL) || |
e678fb0d | 74 | ((vp = vn_from_inode(fp->f_path.dentry->d_inode)) == NULL)) { |
1da177e4 LT |
75 | error = XFS_ERROR(EINVAL); |
76 | goto error0; | |
77 | } | |
78 | ||
75e17b3c CH |
79 | ip = xfs_vtoi(vp); |
80 | if (ip == NULL) { | |
1da177e4 LT |
81 | error = XFS_ERROR(EBADF); |
82 | goto error0; | |
1da177e4 LT |
83 | } |
84 | ||
d0cfb373 | 85 | if (((tfp = fget((int)sxp->sx_fdtmp)) == NULL) || |
e678fb0d | 86 | ((tvp = vn_from_inode(tfp->f_path.dentry->d_inode)) == NULL)) { |
1da177e4 LT |
87 | error = XFS_ERROR(EINVAL); |
88 | goto error0; | |
89 | } | |
90 | ||
75e17b3c CH |
91 | tip = xfs_vtoi(tvp); |
92 | if (tip == NULL) { | |
1da177e4 LT |
93 | error = XFS_ERROR(EBADF); |
94 | goto error0; | |
1da177e4 LT |
95 | } |
96 | ||
97 | if (ip->i_mount != tip->i_mount) { | |
98 | error = XFS_ERROR(EINVAL); | |
99 | goto error0; | |
100 | } | |
101 | ||
102 | if (ip->i_ino == tip->i_ino) { | |
103 | error = XFS_ERROR(EINVAL); | |
104 | goto error0; | |
105 | } | |
106 | ||
107 | mp = ip->i_mount; | |
108 | ||
1da177e4 LT |
109 | if (XFS_FORCED_SHUTDOWN(mp)) { |
110 | error = XFS_ERROR(EIO); | |
111 | goto error0; | |
112 | } | |
113 | ||
541d7d3c | 114 | error = xfs_swap_extents(ip, tip, sxp); |
3e57ecf6 OW |
115 | |
116 | error0: | |
117 | if (fp != NULL) | |
118 | fput(fp); | |
119 | if (tfp != NULL) | |
120 | fput(tfp); | |
121 | ||
122 | if (sxp != NULL) | |
123 | kmem_free(sxp, sizeof(xfs_swapext_t)); | |
124 | ||
125 | return error; | |
126 | } | |
127 | ||
128 | int | |
129 | xfs_swap_extents( | |
130 | xfs_inode_t *ip, | |
131 | xfs_inode_t *tip, | |
132 | xfs_swapext_t *sxp) | |
133 | { | |
134 | xfs_mount_t *mp; | |
135 | xfs_inode_t *ips[2]; | |
136 | xfs_trans_t *tp; | |
137 | xfs_bstat_t *sbp = &sxp->sx_stat; | |
67fcaa73 | 138 | bhv_vnode_t *vp, *tvp; |
3e57ecf6 OW |
139 | xfs_ifork_t *tempifp, *ifp, *tifp; |
140 | int ilf_fields, tilf_fields; | |
141 | static uint lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL; | |
142 | int error = 0; | |
143 | int aforkblks = 0; | |
144 | int taforkblks = 0; | |
145 | __uint64_t tmp; | |
146 | char locked = 0; | |
147 | ||
148 | mp = ip->i_mount; | |
149 | ||
150 | tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL); | |
151 | if (!tempifp) { | |
152 | error = XFS_ERROR(ENOMEM); | |
153 | goto error0; | |
154 | } | |
155 | ||
156 | sbp = &sxp->sx_stat; | |
157 | vp = XFS_ITOV(ip); | |
158 | tvp = XFS_ITOV(tip); | |
1da177e4 LT |
159 | |
160 | /* Lock in i_ino order */ | |
161 | if (ip->i_ino < tip->i_ino) { | |
162 | ips[0] = ip; | |
163 | ips[1] = tip; | |
164 | } else { | |
165 | ips[0] = tip; | |
166 | ips[1] = ip; | |
167 | } | |
d0cfb373 | 168 | |
1da177e4 | 169 | xfs_lock_inodes(ips, 2, 0, lock_flags); |
3e57ecf6 | 170 | locked = 1; |
1da177e4 LT |
171 | |
172 | /* Check permissions */ | |
173 | error = xfs_iaccess(ip, S_IWUSR, NULL); | |
174 | if (error) | |
175 | goto error0; | |
176 | ||
177 | error = xfs_iaccess(tip, S_IWUSR, NULL); | |
178 | if (error) | |
179 | goto error0; | |
180 | ||
181 | /* Verify that both files have the same format */ | |
182 | if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) { | |
183 | error = XFS_ERROR(EINVAL); | |
184 | goto error0; | |
185 | } | |
186 | ||
187 | /* Verify both files are either real-time or non-realtime */ | |
188 | if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) != | |
189 | (tip->i_d.di_flags & XFS_DIFLAG_REALTIME)) { | |
190 | error = XFS_ERROR(EINVAL); | |
191 | goto error0; | |
192 | } | |
193 | ||
194 | /* Should never get a local format */ | |
195 | if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL || | |
196 | tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) { | |
197 | error = XFS_ERROR(EINVAL); | |
198 | goto error0; | |
199 | } | |
200 | ||
bd5a876a | 201 | if (VN_CACHED(tvp) != 0) { |
613d7043 | 202 | xfs_inval_cached_trace(tip, 0, -1, 0, -1); |
739bfb2a CH |
203 | error = xfs_flushinval_pages(tip, 0, -1, |
204 | FI_REMAPF_LOCKED); | |
d3cf2094 LM |
205 | if (error) |
206 | goto error0; | |
bd5a876a | 207 | } |
1da177e4 LT |
208 | |
209 | /* Verify O_DIRECT for ftmp */ | |
210 | if (VN_CACHED(tvp) != 0) { | |
211 | error = XFS_ERROR(EINVAL); | |
212 | goto error0; | |
213 | } | |
214 | ||
215 | /* Verify all data are being swapped */ | |
d0cfb373 ES |
216 | if (sxp->sx_offset != 0 || |
217 | sxp->sx_length != ip->i_d.di_size || | |
218 | sxp->sx_length != tip->i_d.di_size) { | |
1da177e4 LT |
219 | error = XFS_ERROR(EFAULT); |
220 | goto error0; | |
221 | } | |
222 | ||
223 | /* | |
224 | * If the target has extended attributes, the tmp file | |
225 | * must also in order to ensure the correct data fork | |
226 | * format. | |
227 | */ | |
228 | if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) { | |
229 | error = XFS_ERROR(EINVAL); | |
230 | goto error0; | |
231 | } | |
232 | ||
233 | /* | |
234 | * Compare the current change & modify times with that | |
235 | * passed in. If they differ, we abort this swap. | |
236 | * This is the mechanism used to ensure the calling | |
237 | * process that the file was not changed out from | |
238 | * under it. | |
239 | */ | |
240 | if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) || | |
241 | (sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) || | |
242 | (sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) || | |
243 | (sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) { | |
244 | error = XFS_ERROR(EBUSY); | |
245 | goto error0; | |
246 | } | |
247 | ||
248 | /* We need to fail if the file is memory mapped. Once we have tossed | |
249 | * all existing pages, the page fault will have no option | |
250 | * but to go to the filesystem for pages. By making the page fault call | |
67fcaa73 | 251 | * vop_read (or write in the case of autogrow) they block on the iolock |
1da177e4 LT |
252 | * until we have switched the extents. |
253 | */ | |
254 | if (VN_MAPPED(vp)) { | |
255 | error = XFS_ERROR(EBUSY); | |
256 | goto error0; | |
257 | } | |
258 | ||
259 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
260 | xfs_iunlock(tip, XFS_ILOCK_EXCL); | |
261 | ||
262 | /* | |
263 | * There is a race condition here since we gave up the | |
264 | * ilock. However, the data fork will not change since | |
265 | * we have the iolock (locked for truncation too) so we | |
266 | * are safe. We don't really care if non-io related | |
267 | * fields change. | |
268 | */ | |
269 | ||
739bfb2a | 270 | xfs_tosspages(ip, 0, -1, FI_REMAPF); |
1da177e4 LT |
271 | |
272 | tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT); | |
273 | if ((error = xfs_trans_reserve(tp, 0, | |
274 | XFS_ICHANGE_LOG_RES(mp), 0, | |
275 | 0, 0))) { | |
276 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
277 | xfs_iunlock(tip, XFS_IOLOCK_EXCL); | |
278 | xfs_trans_cancel(tp, 0); | |
d0cfb373 ES |
279 | locked = 0; |
280 | goto error0; | |
1da177e4 LT |
281 | } |
282 | xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL); | |
283 | ||
284 | /* | |
285 | * Count the number of extended attribute blocks | |
286 | */ | |
287 | if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) && | |
288 | (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { | |
289 | error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks); | |
290 | if (error) { | |
1da177e4 | 291 | xfs_trans_cancel(tp, 0); |
d0cfb373 | 292 | goto error0; |
1da177e4 LT |
293 | } |
294 | } | |
295 | if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) && | |
296 | (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { | |
297 | error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK, | |
298 | &taforkblks); | |
299 | if (error) { | |
1da177e4 | 300 | xfs_trans_cancel(tp, 0); |
d0cfb373 | 301 | goto error0; |
1da177e4 LT |
302 | } |
303 | } | |
304 | ||
305 | /* | |
306 | * Swap the data forks of the inodes | |
307 | */ | |
308 | ifp = &ip->i_df; | |
309 | tifp = &tip->i_df; | |
d0cfb373 ES |
310 | *tempifp = *ifp; /* struct copy */ |
311 | *ifp = *tifp; /* struct copy */ | |
312 | *tifp = *tempifp; /* struct copy */ | |
1da177e4 LT |
313 | |
314 | /* | |
315 | * Fix the on-disk inode values | |
316 | */ | |
317 | tmp = (__uint64_t)ip->i_d.di_nblocks; | |
318 | ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks; | |
319 | tip->i_d.di_nblocks = tmp + taforkblks - aforkblks; | |
320 | ||
321 | tmp = (__uint64_t) ip->i_d.di_nextents; | |
322 | ip->i_d.di_nextents = tip->i_d.di_nextents; | |
323 | tip->i_d.di_nextents = tmp; | |
324 | ||
325 | tmp = (__uint64_t) ip->i_d.di_format; | |
326 | ip->i_d.di_format = tip->i_d.di_format; | |
327 | tip->i_d.di_format = tmp; | |
328 | ||
329 | ilf_fields = XFS_ILOG_CORE; | |
330 | ||
331 | switch(ip->i_d.di_format) { | |
332 | case XFS_DINODE_FMT_EXTENTS: | |
333 | /* If the extents fit in the inode, fix the | |
334 | * pointer. Otherwise it's already NULL or | |
335 | * pointing to the extent. | |
336 | */ | |
337 | if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) { | |
338 | ifp->if_u1.if_extents = | |
339 | ifp->if_u2.if_inline_ext; | |
340 | } | |
341 | ilf_fields |= XFS_ILOG_DEXT; | |
342 | break; | |
343 | case XFS_DINODE_FMT_BTREE: | |
344 | ilf_fields |= XFS_ILOG_DBROOT; | |
345 | break; | |
346 | } | |
347 | ||
348 | tilf_fields = XFS_ILOG_CORE; | |
349 | ||
350 | switch(tip->i_d.di_format) { | |
351 | case XFS_DINODE_FMT_EXTENTS: | |
352 | /* If the extents fit in the inode, fix the | |
353 | * pointer. Otherwise it's already NULL or | |
354 | * pointing to the extent. | |
355 | */ | |
356 | if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) { | |
357 | tifp->if_u1.if_extents = | |
358 | tifp->if_u2.if_inline_ext; | |
359 | } | |
360 | tilf_fields |= XFS_ILOG_DEXT; | |
361 | break; | |
362 | case XFS_DINODE_FMT_BTREE: | |
363 | tilf_fields |= XFS_ILOG_DBROOT; | |
364 | break; | |
365 | } | |
366 | ||
367 | /* | |
368 | * Increment vnode ref counts since xfs_trans_commit & | |
369 | * xfs_trans_cancel will both unlock the inodes and | |
370 | * decrement the associated ref counts. | |
371 | */ | |
372 | VN_HOLD(vp); | |
373 | VN_HOLD(tvp); | |
374 | ||
375 | xfs_trans_ijoin(tp, ip, lock_flags); | |
376 | xfs_trans_ijoin(tp, tip, lock_flags); | |
377 | ||
378 | xfs_trans_log_inode(tp, ip, ilf_fields); | |
379 | xfs_trans_log_inode(tp, tip, tilf_fields); | |
380 | ||
381 | /* | |
382 | * If this is a synchronous mount, make sure that the | |
383 | * transaction goes to disk before returning to the user. | |
384 | */ | |
385 | if (mp->m_flags & XFS_MOUNT_WSYNC) { | |
386 | xfs_trans_set_sync(tp); | |
387 | } | |
388 | ||
1c72bf90 | 389 | error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT); |
d0cfb373 | 390 | locked = 0; |
1da177e4 LT |
391 | |
392 | error0: | |
393 | if (locked) { | |
394 | xfs_iunlock(ip, lock_flags); | |
395 | xfs_iunlock(tip, lock_flags); | |
396 | } | |
d0cfb373 ES |
397 | if (tempifp != NULL) |
398 | kmem_free(tempifp, sizeof(xfs_ifork_t)); | |
1da177e4 LT |
399 | return error; |
400 | } |