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_dir.h" |
28 | #include "xfs_dir2.h" | |
29 | #include "xfs_dmapi.h" | |
30 | #include "xfs_mount.h" | |
1da177e4 | 31 | #include "xfs_bmap_btree.h" |
a844f451 | 32 | #include "xfs_alloc_btree.h" |
1da177e4 | 33 | #include "xfs_ialloc_btree.h" |
1da177e4 LT |
34 | #include "xfs_dir_sf.h" |
35 | #include "xfs_dir2_sf.h" | |
a844f451 | 36 | #include "xfs_attr_sf.h" |
1da177e4 | 37 | #include "xfs_dinode.h" |
1da177e4 | 38 | #include "xfs_inode.h" |
a844f451 | 39 | #include "xfs_inode_item.h" |
1da177e4 | 40 | #include "xfs_bmap.h" |
a844f451 | 41 | #include "xfs_btree.h" |
1da177e4 LT |
42 | #include "xfs_ialloc.h" |
43 | #include "xfs_itable.h" | |
44 | #include "xfs_dfrag.h" | |
45 | #include "xfs_error.h" | |
46 | #include "xfs_mac.h" | |
47 | #include "xfs_rw.h" | |
48 | ||
49 | /* | |
50 | * Syssgi interface for swapext | |
51 | */ | |
52 | int | |
53 | xfs_swapext( | |
d0cfb373 | 54 | xfs_swapext_t __user *sxu) |
1da177e4 | 55 | { |
d0cfb373 | 56 | xfs_swapext_t *sxp; |
1da177e4 LT |
57 | xfs_inode_t *ip=NULL, *tip=NULL, *ips[2]; |
58 | xfs_trans_t *tp; | |
59 | xfs_mount_t *mp; | |
60 | xfs_bstat_t *sbp; | |
61 | struct file *fp = NULL, *tfp = NULL; | |
62 | vnode_t *vp, *tvp; | |
63 | bhv_desc_t *bdp, *tbdp; | |
64 | vn_bhv_head_t *bhp, *tbhp; | |
d0cfb373 | 65 | static uint lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL; |
1da177e4 LT |
66 | int ilf_fields, tilf_fields; |
67 | int error = 0; | |
d0cfb373 | 68 | xfs_ifork_t *tempifp, *ifp, *tifp; |
1da177e4 LT |
69 | __uint64_t tmp; |
70 | int aforkblks = 0; | |
71 | int taforkblks = 0; | |
d0cfb373 | 72 | char locked = 0; |
1da177e4 | 73 | |
d0cfb373 ES |
74 | sxp = kmem_alloc(sizeof(xfs_swapext_t), KM_MAYFAIL); |
75 | tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL); | |
76 | if (!sxp || !tempifp) { | |
77 | error = XFS_ERROR(ENOMEM); | |
78 | goto error0; | |
79 | } | |
80 | ||
81 | if (copy_from_user(sxp, sxu, sizeof(xfs_swapext_t))) { | |
82 | error = XFS_ERROR(EFAULT); | |
83 | goto error0; | |
84 | } | |
1da177e4 LT |
85 | |
86 | /* Pull information for the target fd */ | |
d0cfb373 | 87 | if (((fp = fget((int)sxp->sx_fdtarget)) == NULL) || |
1da177e4 LT |
88 | ((vp = LINVFS_GET_VP(fp->f_dentry->d_inode)) == NULL)) { |
89 | error = XFS_ERROR(EINVAL); | |
90 | goto error0; | |
91 | } | |
92 | ||
93 | bhp = VN_BHV_HEAD(vp); | |
94 | bdp = vn_bhv_lookup(bhp, &xfs_vnodeops); | |
95 | if (bdp == NULL) { | |
96 | error = XFS_ERROR(EBADF); | |
97 | goto error0; | |
98 | } else { | |
99 | ip = XFS_BHVTOI(bdp); | |
100 | } | |
101 | ||
d0cfb373 | 102 | if (((tfp = fget((int)sxp->sx_fdtmp)) == NULL) || |
1da177e4 LT |
103 | ((tvp = LINVFS_GET_VP(tfp->f_dentry->d_inode)) == NULL)) { |
104 | error = XFS_ERROR(EINVAL); | |
105 | goto error0; | |
106 | } | |
107 | ||
108 | tbhp = VN_BHV_HEAD(tvp); | |
109 | tbdp = vn_bhv_lookup(tbhp, &xfs_vnodeops); | |
110 | if (tbdp == NULL) { | |
111 | error = XFS_ERROR(EBADF); | |
112 | goto error0; | |
113 | } else { | |
114 | tip = XFS_BHVTOI(tbdp); | |
115 | } | |
116 | ||
117 | if (ip->i_mount != tip->i_mount) { | |
118 | error = XFS_ERROR(EINVAL); | |
119 | goto error0; | |
120 | } | |
121 | ||
122 | if (ip->i_ino == tip->i_ino) { | |
123 | error = XFS_ERROR(EINVAL); | |
124 | goto error0; | |
125 | } | |
126 | ||
127 | mp = ip->i_mount; | |
128 | ||
d0cfb373 | 129 | sbp = &sxp->sx_stat; |
1da177e4 LT |
130 | |
131 | if (XFS_FORCED_SHUTDOWN(mp)) { | |
132 | error = XFS_ERROR(EIO); | |
133 | goto error0; | |
134 | } | |
135 | ||
136 | locked = 1; | |
137 | ||
138 | /* Lock in i_ino order */ | |
139 | if (ip->i_ino < tip->i_ino) { | |
140 | ips[0] = ip; | |
141 | ips[1] = tip; | |
142 | } else { | |
143 | ips[0] = tip; | |
144 | ips[1] = ip; | |
145 | } | |
d0cfb373 | 146 | |
1da177e4 LT |
147 | xfs_lock_inodes(ips, 2, 0, lock_flags); |
148 | ||
149 | /* Check permissions */ | |
150 | error = xfs_iaccess(ip, S_IWUSR, NULL); | |
151 | if (error) | |
152 | goto error0; | |
153 | ||
154 | error = xfs_iaccess(tip, S_IWUSR, NULL); | |
155 | if (error) | |
156 | goto error0; | |
157 | ||
158 | /* Verify that both files have the same format */ | |
159 | if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) { | |
160 | error = XFS_ERROR(EINVAL); | |
161 | goto error0; | |
162 | } | |
163 | ||
164 | /* Verify both files are either real-time or non-realtime */ | |
165 | if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) != | |
166 | (tip->i_d.di_flags & XFS_DIFLAG_REALTIME)) { | |
167 | error = XFS_ERROR(EINVAL); | |
168 | goto error0; | |
169 | } | |
170 | ||
171 | /* Should never get a local format */ | |
172 | if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL || | |
173 | tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) { | |
174 | error = XFS_ERROR(EINVAL); | |
175 | goto error0; | |
176 | } | |
177 | ||
bd5a876a CH |
178 | if (VN_CACHED(tvp) != 0) { |
179 | xfs_inval_cached_trace(&tip->i_iocore, 0, -1, 0, -1); | |
180 | VOP_FLUSHINVAL_PAGES(tvp, 0, -1, FI_REMAPF_LOCKED); | |
181 | } | |
1da177e4 LT |
182 | |
183 | /* Verify O_DIRECT for ftmp */ | |
184 | if (VN_CACHED(tvp) != 0) { | |
185 | error = XFS_ERROR(EINVAL); | |
186 | goto error0; | |
187 | } | |
188 | ||
189 | /* Verify all data are being swapped */ | |
d0cfb373 ES |
190 | if (sxp->sx_offset != 0 || |
191 | sxp->sx_length != ip->i_d.di_size || | |
192 | sxp->sx_length != tip->i_d.di_size) { | |
1da177e4 LT |
193 | error = XFS_ERROR(EFAULT); |
194 | goto error0; | |
195 | } | |
196 | ||
197 | /* | |
198 | * If the target has extended attributes, the tmp file | |
199 | * must also in order to ensure the correct data fork | |
200 | * format. | |
201 | */ | |
202 | if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) { | |
203 | error = XFS_ERROR(EINVAL); | |
204 | goto error0; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Compare the current change & modify times with that | |
209 | * passed in. If they differ, we abort this swap. | |
210 | * This is the mechanism used to ensure the calling | |
211 | * process that the file was not changed out from | |
212 | * under it. | |
213 | */ | |
214 | if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) || | |
215 | (sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) || | |
216 | (sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) || | |
217 | (sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) { | |
218 | error = XFS_ERROR(EBUSY); | |
219 | goto error0; | |
220 | } | |
221 | ||
222 | /* We need to fail if the file is memory mapped. Once we have tossed | |
223 | * all existing pages, the page fault will have no option | |
224 | * but to go to the filesystem for pages. By making the page fault call | |
225 | * VOP_READ (or write in the case of autogrow) they block on the iolock | |
226 | * until we have switched the extents. | |
227 | */ | |
228 | if (VN_MAPPED(vp)) { | |
229 | error = XFS_ERROR(EBUSY); | |
230 | goto error0; | |
231 | } | |
232 | ||
233 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
234 | xfs_iunlock(tip, XFS_ILOCK_EXCL); | |
235 | ||
236 | /* | |
237 | * There is a race condition here since we gave up the | |
238 | * ilock. However, the data fork will not change since | |
239 | * we have the iolock (locked for truncation too) so we | |
240 | * are safe. We don't really care if non-io related | |
241 | * fields change. | |
242 | */ | |
243 | ||
244 | VOP_TOSS_PAGES(vp, 0, -1, FI_REMAPF); | |
245 | ||
246 | tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT); | |
247 | if ((error = xfs_trans_reserve(tp, 0, | |
248 | XFS_ICHANGE_LOG_RES(mp), 0, | |
249 | 0, 0))) { | |
250 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
251 | xfs_iunlock(tip, XFS_IOLOCK_EXCL); | |
252 | xfs_trans_cancel(tp, 0); | |
d0cfb373 ES |
253 | locked = 0; |
254 | goto error0; | |
1da177e4 LT |
255 | } |
256 | xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL); | |
257 | ||
258 | /* | |
259 | * Count the number of extended attribute blocks | |
260 | */ | |
261 | if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) && | |
262 | (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { | |
263 | error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks); | |
264 | if (error) { | |
1da177e4 | 265 | xfs_trans_cancel(tp, 0); |
d0cfb373 | 266 | goto error0; |
1da177e4 LT |
267 | } |
268 | } | |
269 | if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) && | |
270 | (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { | |
271 | error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK, | |
272 | &taforkblks); | |
273 | if (error) { | |
1da177e4 | 274 | xfs_trans_cancel(tp, 0); |
d0cfb373 | 275 | goto error0; |
1da177e4 LT |
276 | } |
277 | } | |
278 | ||
279 | /* | |
280 | * Swap the data forks of the inodes | |
281 | */ | |
282 | ifp = &ip->i_df; | |
283 | tifp = &tip->i_df; | |
d0cfb373 ES |
284 | *tempifp = *ifp; /* struct copy */ |
285 | *ifp = *tifp; /* struct copy */ | |
286 | *tifp = *tempifp; /* struct copy */ | |
1da177e4 LT |
287 | |
288 | /* | |
289 | * Fix the on-disk inode values | |
290 | */ | |
291 | tmp = (__uint64_t)ip->i_d.di_nblocks; | |
292 | ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks; | |
293 | tip->i_d.di_nblocks = tmp + taforkblks - aforkblks; | |
294 | ||
295 | tmp = (__uint64_t) ip->i_d.di_nextents; | |
296 | ip->i_d.di_nextents = tip->i_d.di_nextents; | |
297 | tip->i_d.di_nextents = tmp; | |
298 | ||
299 | tmp = (__uint64_t) ip->i_d.di_format; | |
300 | ip->i_d.di_format = tip->i_d.di_format; | |
301 | tip->i_d.di_format = tmp; | |
302 | ||
303 | ilf_fields = XFS_ILOG_CORE; | |
304 | ||
305 | switch(ip->i_d.di_format) { | |
306 | case XFS_DINODE_FMT_EXTENTS: | |
307 | /* If the extents fit in the inode, fix the | |
308 | * pointer. Otherwise it's already NULL or | |
309 | * pointing to the extent. | |
310 | */ | |
311 | if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) { | |
312 | ifp->if_u1.if_extents = | |
313 | ifp->if_u2.if_inline_ext; | |
314 | } | |
315 | ilf_fields |= XFS_ILOG_DEXT; | |
316 | break; | |
317 | case XFS_DINODE_FMT_BTREE: | |
318 | ilf_fields |= XFS_ILOG_DBROOT; | |
319 | break; | |
320 | } | |
321 | ||
322 | tilf_fields = XFS_ILOG_CORE; | |
323 | ||
324 | switch(tip->i_d.di_format) { | |
325 | case XFS_DINODE_FMT_EXTENTS: | |
326 | /* If the extents fit in the inode, fix the | |
327 | * pointer. Otherwise it's already NULL or | |
328 | * pointing to the extent. | |
329 | */ | |
330 | if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) { | |
331 | tifp->if_u1.if_extents = | |
332 | tifp->if_u2.if_inline_ext; | |
333 | } | |
334 | tilf_fields |= XFS_ILOG_DEXT; | |
335 | break; | |
336 | case XFS_DINODE_FMT_BTREE: | |
337 | tilf_fields |= XFS_ILOG_DBROOT; | |
338 | break; | |
339 | } | |
340 | ||
341 | /* | |
342 | * Increment vnode ref counts since xfs_trans_commit & | |
343 | * xfs_trans_cancel will both unlock the inodes and | |
344 | * decrement the associated ref counts. | |
345 | */ | |
346 | VN_HOLD(vp); | |
347 | VN_HOLD(tvp); | |
348 | ||
349 | xfs_trans_ijoin(tp, ip, lock_flags); | |
350 | xfs_trans_ijoin(tp, tip, lock_flags); | |
351 | ||
352 | xfs_trans_log_inode(tp, ip, ilf_fields); | |
353 | xfs_trans_log_inode(tp, tip, tilf_fields); | |
354 | ||
355 | /* | |
356 | * If this is a synchronous mount, make sure that the | |
357 | * transaction goes to disk before returning to the user. | |
358 | */ | |
359 | if (mp->m_flags & XFS_MOUNT_WSYNC) { | |
360 | xfs_trans_set_sync(tp); | |
361 | } | |
362 | ||
363 | error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT, NULL); | |
d0cfb373 | 364 | locked = 0; |
1da177e4 LT |
365 | |
366 | error0: | |
367 | if (locked) { | |
368 | xfs_iunlock(ip, lock_flags); | |
369 | xfs_iunlock(tip, lock_flags); | |
370 | } | |
371 | ||
d0cfb373 ES |
372 | if (fp != NULL) |
373 | fput(fp); | |
374 | if (tfp != NULL) | |
375 | fput(tfp); | |
376 | ||
377 | if (sxp != NULL) | |
378 | kmem_free(sxp, sizeof(xfs_swapext_t)); | |
379 | if (tempifp != NULL) | |
380 | kmem_free(tempifp, sizeof(xfs_ifork_t)); | |
1da177e4 LT |
381 | |
382 | return error; | |
383 | } |