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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it would be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
11 | * | |
12 | * Further, this software is distributed without any warranty that it is | |
13 | * free of the rightful claim of any third person regarding infringement | |
14 | * or the like. Any license provided herein, whether implied or | |
15 | * otherwise, applies only to this software file. Patent licenses, if | |
16 | * any, provided herein do not apply to combinations of this program with | |
17 | * other software, or any other product whatsoever. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write the Free Software Foundation, Inc., 59 | |
21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
22 | * | |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, | |
24 | * Mountain View, CA 94043, or: | |
25 | * | |
26 | * http://www.sgi.com | |
27 | * | |
28 | * For further information regarding this notice, see: | |
29 | * | |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ | |
31 | */ | |
32 | ||
33 | #include "xfs.h" | |
34 | #include "xfs_macros.h" | |
35 | #include "xfs_types.h" | |
36 | #include "xfs_inum.h" | |
37 | #include "xfs_log.h" | |
38 | #include "xfs_trans.h" | |
39 | #include "xfs_sb.h" | |
40 | #include "xfs_dir.h" | |
41 | #include "xfs_dir2.h" | |
42 | #include "xfs_dmapi.h" | |
43 | #include "xfs_mount.h" | |
44 | #include "xfs_ag.h" | |
45 | #include "xfs_alloc_btree.h" | |
46 | #include "xfs_bmap_btree.h" | |
47 | #include "xfs_ialloc_btree.h" | |
48 | #include "xfs_btree.h" | |
49 | #include "xfs_attr_sf.h" | |
50 | #include "xfs_dir_sf.h" | |
51 | #include "xfs_dir2_sf.h" | |
52 | #include "xfs_dinode.h" | |
53 | #include "xfs_inode_item.h" | |
54 | #include "xfs_inode.h" | |
55 | #include "xfs_bmap.h" | |
56 | #include "xfs_ialloc.h" | |
57 | #include "xfs_itable.h" | |
58 | #include "xfs_dfrag.h" | |
59 | #include "xfs_error.h" | |
60 | #include "xfs_mac.h" | |
61 | #include "xfs_rw.h" | |
62 | ||
63 | /* | |
64 | * Syssgi interface for swapext | |
65 | */ | |
66 | int | |
67 | xfs_swapext( | |
68 | xfs_swapext_t __user *sxp) | |
69 | { | |
70 | xfs_swapext_t sx; | |
71 | xfs_inode_t *ip=NULL, *tip=NULL, *ips[2]; | |
72 | xfs_trans_t *tp; | |
73 | xfs_mount_t *mp; | |
74 | xfs_bstat_t *sbp; | |
75 | struct file *fp = NULL, *tfp = NULL; | |
76 | vnode_t *vp, *tvp; | |
77 | bhv_desc_t *bdp, *tbdp; | |
78 | vn_bhv_head_t *bhp, *tbhp; | |
79 | uint lock_flags=0; | |
80 | int ilf_fields, tilf_fields; | |
81 | int error = 0; | |
82 | xfs_ifork_t tempif, *ifp, *tifp; | |
83 | __uint64_t tmp; | |
84 | int aforkblks = 0; | |
85 | int taforkblks = 0; | |
86 | int locked = 0; | |
87 | ||
88 | if (copy_from_user(&sx, sxp, sizeof(sx))) | |
89 | return XFS_ERROR(EFAULT); | |
90 | ||
91 | /* Pull information for the target fd */ | |
92 | if (((fp = fget((int)sx.sx_fdtarget)) == NULL) || | |
93 | ((vp = LINVFS_GET_VP(fp->f_dentry->d_inode)) == NULL)) { | |
94 | error = XFS_ERROR(EINVAL); | |
95 | goto error0; | |
96 | } | |
97 | ||
98 | bhp = VN_BHV_HEAD(vp); | |
99 | bdp = vn_bhv_lookup(bhp, &xfs_vnodeops); | |
100 | if (bdp == NULL) { | |
101 | error = XFS_ERROR(EBADF); | |
102 | goto error0; | |
103 | } else { | |
104 | ip = XFS_BHVTOI(bdp); | |
105 | } | |
106 | ||
107 | if (((tfp = fget((int)sx.sx_fdtmp)) == NULL) || | |
108 | ((tvp = LINVFS_GET_VP(tfp->f_dentry->d_inode)) == NULL)) { | |
109 | error = XFS_ERROR(EINVAL); | |
110 | goto error0; | |
111 | } | |
112 | ||
113 | tbhp = VN_BHV_HEAD(tvp); | |
114 | tbdp = vn_bhv_lookup(tbhp, &xfs_vnodeops); | |
115 | if (tbdp == NULL) { | |
116 | error = XFS_ERROR(EBADF); | |
117 | goto error0; | |
118 | } else { | |
119 | tip = XFS_BHVTOI(tbdp); | |
120 | } | |
121 | ||
122 | if (ip->i_mount != tip->i_mount) { | |
123 | error = XFS_ERROR(EINVAL); | |
124 | goto error0; | |
125 | } | |
126 | ||
127 | if (ip->i_ino == tip->i_ino) { | |
128 | error = XFS_ERROR(EINVAL); | |
129 | goto error0; | |
130 | } | |
131 | ||
132 | mp = ip->i_mount; | |
133 | ||
134 | sbp = &sx.sx_stat; | |
135 | ||
136 | if (XFS_FORCED_SHUTDOWN(mp)) { | |
137 | error = XFS_ERROR(EIO); | |
138 | goto error0; | |
139 | } | |
140 | ||
141 | locked = 1; | |
142 | ||
143 | /* Lock in i_ino order */ | |
144 | if (ip->i_ino < tip->i_ino) { | |
145 | ips[0] = ip; | |
146 | ips[1] = tip; | |
147 | } else { | |
148 | ips[0] = tip; | |
149 | ips[1] = ip; | |
150 | } | |
151 | lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL; | |
152 | xfs_lock_inodes(ips, 2, 0, lock_flags); | |
153 | ||
154 | /* Check permissions */ | |
155 | error = xfs_iaccess(ip, S_IWUSR, NULL); | |
156 | if (error) | |
157 | goto error0; | |
158 | ||
159 | error = xfs_iaccess(tip, S_IWUSR, NULL); | |
160 | if (error) | |
161 | goto error0; | |
162 | ||
163 | /* Verify that both files have the same format */ | |
164 | if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) { | |
165 | error = XFS_ERROR(EINVAL); | |
166 | goto error0; | |
167 | } | |
168 | ||
169 | /* Verify both files are either real-time or non-realtime */ | |
170 | if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) != | |
171 | (tip->i_d.di_flags & XFS_DIFLAG_REALTIME)) { | |
172 | error = XFS_ERROR(EINVAL); | |
173 | goto error0; | |
174 | } | |
175 | ||
176 | /* Should never get a local format */ | |
177 | if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL || | |
178 | tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) { | |
179 | error = XFS_ERROR(EINVAL); | |
180 | goto error0; | |
181 | } | |
182 | ||
183 | if (VN_CACHED(tvp) != 0) | |
184 | xfs_inval_cached_pages(XFS_ITOV(tip), &(tip->i_iocore), | |
f403b7f4 | 185 | (xfs_off_t)0, 0, 0); |
1da177e4 LT |
186 | |
187 | /* Verify O_DIRECT for ftmp */ | |
188 | if (VN_CACHED(tvp) != 0) { | |
189 | error = XFS_ERROR(EINVAL); | |
190 | goto error0; | |
191 | } | |
192 | ||
193 | /* Verify all data are being swapped */ | |
194 | if (sx.sx_offset != 0 || | |
195 | sx.sx_length != ip->i_d.di_size || | |
196 | sx.sx_length != tip->i_d.di_size) { | |
197 | error = XFS_ERROR(EFAULT); | |
198 | goto error0; | |
199 | } | |
200 | ||
201 | /* | |
202 | * If the target has extended attributes, the tmp file | |
203 | * must also in order to ensure the correct data fork | |
204 | * format. | |
205 | */ | |
206 | if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) { | |
207 | error = XFS_ERROR(EINVAL); | |
208 | goto error0; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Compare the current change & modify times with that | |
213 | * passed in. If they differ, we abort this swap. | |
214 | * This is the mechanism used to ensure the calling | |
215 | * process that the file was not changed out from | |
216 | * under it. | |
217 | */ | |
218 | if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) || | |
219 | (sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) || | |
220 | (sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) || | |
221 | (sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) { | |
222 | error = XFS_ERROR(EBUSY); | |
223 | goto error0; | |
224 | } | |
225 | ||
226 | /* We need to fail if the file is memory mapped. Once we have tossed | |
227 | * all existing pages, the page fault will have no option | |
228 | * but to go to the filesystem for pages. By making the page fault call | |
229 | * VOP_READ (or write in the case of autogrow) they block on the iolock | |
230 | * until we have switched the extents. | |
231 | */ | |
232 | if (VN_MAPPED(vp)) { | |
233 | error = XFS_ERROR(EBUSY); | |
234 | goto error0; | |
235 | } | |
236 | ||
237 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
238 | xfs_iunlock(tip, XFS_ILOCK_EXCL); | |
239 | ||
240 | /* | |
241 | * There is a race condition here since we gave up the | |
242 | * ilock. However, the data fork will not change since | |
243 | * we have the iolock (locked for truncation too) so we | |
244 | * are safe. We don't really care if non-io related | |
245 | * fields change. | |
246 | */ | |
247 | ||
248 | VOP_TOSS_PAGES(vp, 0, -1, FI_REMAPF); | |
249 | ||
250 | tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT); | |
251 | if ((error = xfs_trans_reserve(tp, 0, | |
252 | XFS_ICHANGE_LOG_RES(mp), 0, | |
253 | 0, 0))) { | |
254 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
255 | xfs_iunlock(tip, XFS_IOLOCK_EXCL); | |
256 | xfs_trans_cancel(tp, 0); | |
257 | return error; | |
258 | } | |
259 | xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL); | |
260 | ||
261 | /* | |
262 | * Count the number of extended attribute blocks | |
263 | */ | |
264 | if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) && | |
265 | (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { | |
266 | error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks); | |
267 | if (error) { | |
268 | xfs_iunlock(ip, lock_flags); | |
269 | xfs_iunlock(tip, lock_flags); | |
270 | xfs_trans_cancel(tp, 0); | |
271 | return error; | |
272 | } | |
273 | } | |
274 | if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) && | |
275 | (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { | |
276 | error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK, | |
277 | &taforkblks); | |
278 | if (error) { | |
279 | xfs_iunlock(ip, lock_flags); | |
280 | xfs_iunlock(tip, lock_flags); | |
281 | xfs_trans_cancel(tp, 0); | |
282 | return error; | |
283 | } | |
284 | } | |
285 | ||
286 | /* | |
287 | * Swap the data forks of the inodes | |
288 | */ | |
289 | ifp = &ip->i_df; | |
290 | tifp = &tip->i_df; | |
291 | tempif = *ifp; /* struct copy */ | |
292 | *ifp = *tifp; /* struct copy */ | |
293 | *tifp = tempif; /* struct copy */ | |
294 | ||
295 | /* | |
296 | * Fix the on-disk inode values | |
297 | */ | |
298 | tmp = (__uint64_t)ip->i_d.di_nblocks; | |
299 | ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks; | |
300 | tip->i_d.di_nblocks = tmp + taforkblks - aforkblks; | |
301 | ||
302 | tmp = (__uint64_t) ip->i_d.di_nextents; | |
303 | ip->i_d.di_nextents = tip->i_d.di_nextents; | |
304 | tip->i_d.di_nextents = tmp; | |
305 | ||
306 | tmp = (__uint64_t) ip->i_d.di_format; | |
307 | ip->i_d.di_format = tip->i_d.di_format; | |
308 | tip->i_d.di_format = tmp; | |
309 | ||
310 | ilf_fields = XFS_ILOG_CORE; | |
311 | ||
312 | switch(ip->i_d.di_format) { | |
313 | case XFS_DINODE_FMT_EXTENTS: | |
314 | /* If the extents fit in the inode, fix the | |
315 | * pointer. Otherwise it's already NULL or | |
316 | * pointing to the extent. | |
317 | */ | |
318 | if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) { | |
319 | ifp->if_u1.if_extents = | |
320 | ifp->if_u2.if_inline_ext; | |
321 | } | |
322 | ilf_fields |= XFS_ILOG_DEXT; | |
323 | break; | |
324 | case XFS_DINODE_FMT_BTREE: | |
325 | ilf_fields |= XFS_ILOG_DBROOT; | |
326 | break; | |
327 | } | |
328 | ||
329 | tilf_fields = XFS_ILOG_CORE; | |
330 | ||
331 | switch(tip->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 (tip->i_d.di_nextents <= XFS_INLINE_EXTS) { | |
338 | tifp->if_u1.if_extents = | |
339 | tifp->if_u2.if_inline_ext; | |
340 | } | |
341 | tilf_fields |= XFS_ILOG_DEXT; | |
342 | break; | |
343 | case XFS_DINODE_FMT_BTREE: | |
344 | tilf_fields |= XFS_ILOG_DBROOT; | |
345 | break; | |
346 | } | |
347 | ||
348 | /* | |
349 | * Increment vnode ref counts since xfs_trans_commit & | |
350 | * xfs_trans_cancel will both unlock the inodes and | |
351 | * decrement the associated ref counts. | |
352 | */ | |
353 | VN_HOLD(vp); | |
354 | VN_HOLD(tvp); | |
355 | ||
356 | xfs_trans_ijoin(tp, ip, lock_flags); | |
357 | xfs_trans_ijoin(tp, tip, lock_flags); | |
358 | ||
359 | xfs_trans_log_inode(tp, ip, ilf_fields); | |
360 | xfs_trans_log_inode(tp, tip, tilf_fields); | |
361 | ||
362 | /* | |
363 | * If this is a synchronous mount, make sure that the | |
364 | * transaction goes to disk before returning to the user. | |
365 | */ | |
366 | if (mp->m_flags & XFS_MOUNT_WSYNC) { | |
367 | xfs_trans_set_sync(tp); | |
368 | } | |
369 | ||
370 | error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT, NULL); | |
371 | ||
372 | fput(fp); | |
373 | fput(tfp); | |
374 | ||
375 | return error; | |
376 | ||
377 | error0: | |
378 | if (locked) { | |
379 | xfs_iunlock(ip, lock_flags); | |
380 | xfs_iunlock(tip, lock_flags); | |
381 | } | |
382 | ||
383 | if (fp != NULL) fput(fp); | |
384 | if (tfp != NULL) fput(tfp); | |
385 | ||
386 | return error; | |
387 | } |