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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_mount.h"
13#include "xfs_inode.h"
14#include "xfs_btree.h"
15#include "xfs_ialloc.h"
16#include "xfs_ialloc_btree.h"
17#include "xfs_iwalk.h"
18#include "xfs_itable.h"
19#include "xfs_error.h"
20#include "xfs_icache.h"
21#include "xfs_health.h"
22#include "xfs_trans.h"
23
24/*
25 * Bulk Stat
26 * =========
27 *
28 * Use the inode walking functions to fill out struct xfs_bulkstat for every
29 * allocated inode, then pass the stat information to some externally provided
30 * iteration function.
31 */
32
33struct xfs_bstat_chunk {
34 bulkstat_one_fmt_pf formatter;
35 struct xfs_ibulk *breq;
36 struct xfs_bulkstat *buf;
37};
38
39static inline bool
40want_metadir_file(
41 struct xfs_inode *ip,
42 struct xfs_ibulk *breq)
43{
44 return xfs_is_metadir_inode(ip) && (breq->flags & XFS_IBULK_METADIR);
45}
46
47/*
48 * Fill out the bulkstat info for a single inode and report it somewhere.
49 *
50 * bc->breq->lastino is effectively the inode cursor as we walk through the
51 * filesystem. Therefore, we update it any time we need to move the cursor
52 * forward, regardless of whether or not we're sending any bstat information
53 * back to userspace. If the inode is internal metadata or, has been freed
54 * out from under us, we just simply keep going.
55 *
56 * However, if any other type of error happens we want to stop right where we
57 * are so that userspace will call back with exact number of the bad inode and
58 * we can send back an error code.
59 *
60 * Note that if the formatter tells us there's no space left in the buffer we
61 * move the cursor forward and abort the walk.
62 */
63STATIC int
64xfs_bulkstat_one_int(
65 struct xfs_mount *mp,
66 struct mnt_idmap *idmap,
67 struct xfs_trans *tp,
68 xfs_ino_t ino,
69 struct xfs_bstat_chunk *bc)
70{
71 struct user_namespace *sb_userns = mp->m_super->s_user_ns;
72 struct xfs_inode *ip; /* incore inode pointer */
73 struct inode *inode;
74 struct xfs_bulkstat *buf = bc->buf;
75 xfs_extnum_t nextents;
76 int error = -EINVAL;
77 vfsuid_t vfsuid;
78 vfsgid_t vfsgid;
79
80 error = xfs_iget(mp, tp, ino,
81 (XFS_IGET_DONTCACHE | XFS_IGET_UNTRUSTED),
82 XFS_ILOCK_SHARED, &ip);
83 if (error == -ENOENT || error == -EINVAL)
84 goto out_advance;
85 if (error)
86 goto out;
87
88 /* Reload the incore unlinked list to avoid failure in inodegc. */
89 if (xfs_inode_unlinked_incomplete(ip)) {
90 error = xfs_inode_reload_unlinked_bucket(tp, ip);
91 if (error) {
92 xfs_iunlock(ip, XFS_ILOCK_SHARED);
93 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
94 xfs_irele(ip);
95 return error;
96 }
97 }
98
99 ASSERT(ip != NULL);
100 ASSERT(ip->i_imap.im_blkno != 0);
101 inode = VFS_I(ip);
102 vfsuid = i_uid_into_vfsuid(idmap, inode);
103 vfsgid = i_gid_into_vfsgid(idmap, inode);
104
105 /*
106 * If caller wants files from the metadata directories, push out the
107 * bare minimum information for enabling scrub.
108 */
109 if (want_metadir_file(ip, bc->breq)) {
110 memset(buf, 0, sizeof(*buf));
111 buf->bs_ino = ino;
112 buf->bs_gen = inode->i_generation;
113 buf->bs_mode = inode->i_mode & S_IFMT;
114 xfs_bulkstat_health(ip, buf);
115 buf->bs_version = XFS_BULKSTAT_VERSION_V5;
116 xfs_iunlock(ip, XFS_ILOCK_SHARED);
117 xfs_irele(ip);
118
119 error = bc->formatter(bc->breq, buf);
120 if (!error || error == -ECANCELED)
121 goto out_advance;
122 goto out;
123 }
124
125 /* If this is a private inode, don't leak its details to userspace. */
126 if (IS_PRIVATE(inode) || xfs_is_sb_inum(mp, ino)) {
127 xfs_iunlock(ip, XFS_ILOCK_SHARED);
128 xfs_irele(ip);
129 error = -EINVAL;
130 goto out_advance;
131 }
132
133 /* xfs_iget returns the following without needing
134 * further change.
135 */
136 buf->bs_projectid = ip->i_projid;
137 buf->bs_ino = ino;
138 buf->bs_uid = from_kuid(sb_userns, vfsuid_into_kuid(vfsuid));
139 buf->bs_gid = from_kgid(sb_userns, vfsgid_into_kgid(vfsgid));
140 buf->bs_size = ip->i_disk_size;
141
142 buf->bs_nlink = inode->i_nlink;
143 buf->bs_atime = inode_get_atime_sec(inode);
144 buf->bs_atime_nsec = inode_get_atime_nsec(inode);
145 buf->bs_mtime = inode_get_mtime_sec(inode);
146 buf->bs_mtime_nsec = inode_get_mtime_nsec(inode);
147 buf->bs_ctime = inode_get_ctime_sec(inode);
148 buf->bs_ctime_nsec = inode_get_ctime_nsec(inode);
149 buf->bs_gen = inode->i_generation;
150 buf->bs_mode = inode->i_mode;
151
152 buf->bs_xflags = xfs_ip2xflags(ip);
153 buf->bs_extsize_blks = ip->i_extsize;
154
155 nextents = xfs_ifork_nextents(&ip->i_df);
156 if (!(bc->breq->flags & XFS_IBULK_NREXT64))
157 buf->bs_extents = min(nextents, XFS_MAX_EXTCNT_DATA_FORK_SMALL);
158 else
159 buf->bs_extents64 = nextents;
160
161 xfs_bulkstat_health(ip, buf);
162 buf->bs_aextents = xfs_ifork_nextents(&ip->i_af);
163 buf->bs_forkoff = xfs_inode_fork_boff(ip);
164 buf->bs_version = XFS_BULKSTAT_VERSION_V5;
165
166 if (xfs_has_v3inodes(mp)) {
167 buf->bs_btime = ip->i_crtime.tv_sec;
168 buf->bs_btime_nsec = ip->i_crtime.tv_nsec;
169 if (ip->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE)
170 buf->bs_cowextsize_blks = ip->i_cowextsize;
171 }
172
173 switch (ip->i_df.if_format) {
174 case XFS_DINODE_FMT_DEV:
175 buf->bs_rdev = sysv_encode_dev(inode->i_rdev);
176 buf->bs_blksize = BLKDEV_IOSIZE;
177 buf->bs_blocks = 0;
178 break;
179 case XFS_DINODE_FMT_LOCAL:
180 buf->bs_rdev = 0;
181 buf->bs_blksize = mp->m_sb.sb_blocksize;
182 buf->bs_blocks = 0;
183 break;
184 case XFS_DINODE_FMT_EXTENTS:
185 case XFS_DINODE_FMT_BTREE:
186 buf->bs_rdev = 0;
187 buf->bs_blksize = mp->m_sb.sb_blocksize;
188 buf->bs_blocks = ip->i_nblocks + ip->i_delayed_blks;
189 break;
190 }
191 xfs_iunlock(ip, XFS_ILOCK_SHARED);
192 xfs_irele(ip);
193
194 error = bc->formatter(bc->breq, buf);
195 if (error == -ECANCELED)
196 goto out_advance;
197 if (error)
198 goto out;
199
200out_advance:
201 /*
202 * Advance the cursor to the inode that comes after the one we just
203 * looked at. We want the caller to move along if the bulkstat
204 * information was copied successfully; if we tried to grab the inode
205 * but it's no longer allocated; or if it's internal metadata.
206 */
207 bc->breq->startino = ino + 1;
208out:
209 return error;
210}
211
212/* Bulkstat a single inode. */
213int
214xfs_bulkstat_one(
215 struct xfs_ibulk *breq,
216 bulkstat_one_fmt_pf formatter)
217{
218 struct xfs_bstat_chunk bc = {
219 .formatter = formatter,
220 .breq = breq,
221 };
222 struct xfs_trans *tp;
223 int error;
224
225 if (breq->idmap != &nop_mnt_idmap) {
226 xfs_warn_ratelimited(breq->mp,
227 "bulkstat not supported inside of idmapped mounts.");
228 return -EINVAL;
229 }
230
231 ASSERT(breq->icount == 1);
232
233 bc.buf = kzalloc(sizeof(struct xfs_bulkstat),
234 GFP_KERNEL | __GFP_RETRY_MAYFAIL);
235 if (!bc.buf)
236 return -ENOMEM;
237
238 /*
239 * Grab an empty transaction so that we can use its recursive buffer
240 * locking abilities to detect cycles in the inobt without deadlocking.
241 */
242 error = xfs_trans_alloc_empty(breq->mp, &tp);
243 if (error)
244 goto out;
245
246 error = xfs_bulkstat_one_int(breq->mp, breq->idmap, tp,
247 breq->startino, &bc);
248 xfs_trans_cancel(tp);
249out:
250 kfree(bc.buf);
251
252 /*
253 * If we reported one inode to userspace then we abort because we hit
254 * the end of the buffer. Don't leak that back to userspace.
255 */
256 if (error == -ECANCELED)
257 error = 0;
258
259 return error;
260}
261
262static int
263xfs_bulkstat_iwalk(
264 struct xfs_mount *mp,
265 struct xfs_trans *tp,
266 xfs_ino_t ino,
267 void *data)
268{
269 struct xfs_bstat_chunk *bc = data;
270 int error;
271
272 error = xfs_bulkstat_one_int(mp, bc->breq->idmap, tp, ino, data);
273 /* bulkstat just skips over missing inodes */
274 if (error == -ENOENT || error == -EINVAL)
275 return 0;
276 return error;
277}
278
279/*
280 * Check the incoming lastino parameter.
281 *
282 * We allow any inode value that could map to physical space inside the
283 * filesystem because if there are no inodes there, bulkstat moves on to the
284 * next chunk. In other words, the magic agino value of zero takes us to the
285 * first chunk in the AG, and an agino value past the end of the AG takes us to
286 * the first chunk in the next AG.
287 *
288 * Therefore we can end early if the requested inode is beyond the end of the
289 * filesystem or doesn't map properly.
290 */
291static inline bool
292xfs_bulkstat_already_done(
293 struct xfs_mount *mp,
294 xfs_ino_t startino)
295{
296 xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, startino);
297 xfs_agino_t agino = XFS_INO_TO_AGINO(mp, startino);
298
299 return agno >= mp->m_sb.sb_agcount ||
300 startino != XFS_AGINO_TO_INO(mp, agno, agino);
301}
302
303/* Return stat information in bulk (by-inode) for the filesystem. */
304int
305xfs_bulkstat(
306 struct xfs_ibulk *breq,
307 bulkstat_one_fmt_pf formatter)
308{
309 struct xfs_bstat_chunk bc = {
310 .formatter = formatter,
311 .breq = breq,
312 };
313 struct xfs_trans *tp;
314 unsigned int iwalk_flags = 0;
315 int error;
316
317 if (breq->idmap != &nop_mnt_idmap) {
318 xfs_warn_ratelimited(breq->mp,
319 "bulkstat not supported inside of idmapped mounts.");
320 return -EINVAL;
321 }
322 if (xfs_bulkstat_already_done(breq->mp, breq->startino))
323 return 0;
324
325 bc.buf = kzalloc(sizeof(struct xfs_bulkstat),
326 GFP_KERNEL | __GFP_RETRY_MAYFAIL);
327 if (!bc.buf)
328 return -ENOMEM;
329
330 /*
331 * Grab an empty transaction so that we can use its recursive buffer
332 * locking abilities to detect cycles in the inobt without deadlocking.
333 */
334 error = xfs_trans_alloc_empty(breq->mp, &tp);
335 if (error)
336 goto out;
337
338 if (breq->flags & XFS_IBULK_SAME_AG)
339 iwalk_flags |= XFS_IWALK_SAME_AG;
340
341 error = xfs_iwalk(breq->mp, tp, breq->startino, iwalk_flags,
342 xfs_bulkstat_iwalk, breq->icount, &bc);
343 xfs_trans_cancel(tp);
344out:
345 kfree(bc.buf);
346
347 /*
348 * We found some inodes, so clear the error status and return them.
349 * The lastino pointer will point directly at the inode that triggered
350 * any error that occurred, so on the next call the error will be
351 * triggered again and propagated to userspace as there will be no
352 * formatted inodes in the buffer.
353 */
354 if (breq->ocount > 0)
355 error = 0;
356
357 return error;
358}
359
360/* Convert bulkstat (v5) to bstat (v1). */
361void
362xfs_bulkstat_to_bstat(
363 struct xfs_mount *mp,
364 struct xfs_bstat *bs1,
365 const struct xfs_bulkstat *bstat)
366{
367 /* memset is needed here because of padding holes in the structure. */
368 memset(bs1, 0, sizeof(struct xfs_bstat));
369 bs1->bs_ino = bstat->bs_ino;
370 bs1->bs_mode = bstat->bs_mode;
371 bs1->bs_nlink = bstat->bs_nlink;
372 bs1->bs_uid = bstat->bs_uid;
373 bs1->bs_gid = bstat->bs_gid;
374 bs1->bs_rdev = bstat->bs_rdev;
375 bs1->bs_blksize = bstat->bs_blksize;
376 bs1->bs_size = bstat->bs_size;
377 bs1->bs_atime.tv_sec = bstat->bs_atime;
378 bs1->bs_mtime.tv_sec = bstat->bs_mtime;
379 bs1->bs_ctime.tv_sec = bstat->bs_ctime;
380 bs1->bs_atime.tv_nsec = bstat->bs_atime_nsec;
381 bs1->bs_mtime.tv_nsec = bstat->bs_mtime_nsec;
382 bs1->bs_ctime.tv_nsec = bstat->bs_ctime_nsec;
383 bs1->bs_blocks = bstat->bs_blocks;
384 bs1->bs_xflags = bstat->bs_xflags;
385 bs1->bs_extsize = XFS_FSB_TO_B(mp, bstat->bs_extsize_blks);
386 bs1->bs_extents = bstat->bs_extents;
387 bs1->bs_gen = bstat->bs_gen;
388 bs1->bs_projid_lo = bstat->bs_projectid & 0xFFFF;
389 bs1->bs_forkoff = bstat->bs_forkoff;
390 bs1->bs_projid_hi = bstat->bs_projectid >> 16;
391 bs1->bs_sick = bstat->bs_sick;
392 bs1->bs_checked = bstat->bs_checked;
393 bs1->bs_cowextsize = XFS_FSB_TO_B(mp, bstat->bs_cowextsize_blks);
394 bs1->bs_dmevmask = 0;
395 bs1->bs_dmstate = 0;
396 bs1->bs_aextents = bstat->bs_aextents;
397}
398
399struct xfs_inumbers_chunk {
400 inumbers_fmt_pf formatter;
401 struct xfs_ibulk *breq;
402};
403
404/*
405 * INUMBERS
406 * ========
407 * This is how we export inode btree records to userspace, so that XFS tools
408 * can figure out where inodes are allocated.
409 */
410
411/*
412 * Format the inode group structure and report it somewhere.
413 *
414 * Similar to xfs_bulkstat_one_int, lastino is the inode cursor as we walk
415 * through the filesystem so we move it forward unless there was a runtime
416 * error. If the formatter tells us the buffer is now full we also move the
417 * cursor forward and abort the walk.
418 */
419STATIC int
420xfs_inumbers_walk(
421 struct xfs_mount *mp,
422 struct xfs_trans *tp,
423 xfs_agnumber_t agno,
424 const struct xfs_inobt_rec_incore *irec,
425 void *data)
426{
427 struct xfs_inumbers inogrp = {
428 .xi_startino = XFS_AGINO_TO_INO(mp, agno, irec->ir_startino),
429 .xi_alloccount = irec->ir_count - irec->ir_freecount,
430 .xi_allocmask = ~irec->ir_free,
431 .xi_version = XFS_INUMBERS_VERSION_V5,
432 };
433 struct xfs_inumbers_chunk *ic = data;
434 int error;
435
436 error = ic->formatter(ic->breq, &inogrp);
437 if (error && error != -ECANCELED)
438 return error;
439
440 ic->breq->startino = XFS_AGINO_TO_INO(mp, agno, irec->ir_startino) +
441 XFS_INODES_PER_CHUNK;
442 return error;
443}
444
445/*
446 * Return inode number table for the filesystem.
447 */
448int
449xfs_inumbers(
450 struct xfs_ibulk *breq,
451 inumbers_fmt_pf formatter)
452{
453 struct xfs_inumbers_chunk ic = {
454 .formatter = formatter,
455 .breq = breq,
456 };
457 struct xfs_trans *tp;
458 int error = 0;
459
460 if (xfs_bulkstat_already_done(breq->mp, breq->startino))
461 return 0;
462
463 /*
464 * Grab an empty transaction so that we can use its recursive buffer
465 * locking abilities to detect cycles in the inobt without deadlocking.
466 */
467 error = xfs_trans_alloc_empty(breq->mp, &tp);
468 if (error)
469 goto out;
470
471 error = xfs_inobt_walk(breq->mp, tp, breq->startino, breq->flags,
472 xfs_inumbers_walk, breq->icount, &ic);
473 xfs_trans_cancel(tp);
474out:
475
476 /*
477 * We found some inode groups, so clear the error status and return
478 * them. The lastino pointer will point directly at the inode that
479 * triggered any error that occurred, so on the next call the error
480 * will be triggered again and propagated to userspace as there will be
481 * no formatted inode groups in the buffer.
482 */
483 if (breq->ocount > 0)
484 error = 0;
485
486 return error;
487}
488
489/* Convert an inumbers (v5) struct to a inogrp (v1) struct. */
490void
491xfs_inumbers_to_inogrp(
492 struct xfs_inogrp *ig1,
493 const struct xfs_inumbers *ig)
494{
495 /* memset is needed here because of padding holes in the structure. */
496 memset(ig1, 0, sizeof(struct xfs_inogrp));
497 ig1->xi_startino = ig->xi_startino;
498 ig1->xi_alloccount = ig->xi_alloccount;
499 ig1->xi_allocmask = ig->xi_allocmask;
500}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_mount.h"
13#include "xfs_inode.h"
14#include "xfs_btree.h"
15#include "xfs_ialloc.h"
16#include "xfs_ialloc_btree.h"
17#include "xfs_iwalk.h"
18#include "xfs_itable.h"
19#include "xfs_error.h"
20#include "xfs_icache.h"
21#include "xfs_health.h"
22
23/*
24 * Bulk Stat
25 * =========
26 *
27 * Use the inode walking functions to fill out struct xfs_bulkstat for every
28 * allocated inode, then pass the stat information to some externally provided
29 * iteration function.
30 */
31
32struct xfs_bstat_chunk {
33 bulkstat_one_fmt_pf formatter;
34 struct xfs_ibulk *breq;
35 struct xfs_bulkstat *buf;
36};
37
38/*
39 * Fill out the bulkstat info for a single inode and report it somewhere.
40 *
41 * bc->breq->lastino is effectively the inode cursor as we walk through the
42 * filesystem. Therefore, we update it any time we need to move the cursor
43 * forward, regardless of whether or not we're sending any bstat information
44 * back to userspace. If the inode is internal metadata or, has been freed
45 * out from under us, we just simply keep going.
46 *
47 * However, if any other type of error happens we want to stop right where we
48 * are so that userspace will call back with exact number of the bad inode and
49 * we can send back an error code.
50 *
51 * Note that if the formatter tells us there's no space left in the buffer we
52 * move the cursor forward and abort the walk.
53 */
54STATIC int
55xfs_bulkstat_one_int(
56 struct xfs_mount *mp,
57 struct user_namespace *mnt_userns,
58 struct xfs_trans *tp,
59 xfs_ino_t ino,
60 struct xfs_bstat_chunk *bc)
61{
62 struct user_namespace *sb_userns = mp->m_super->s_user_ns;
63 struct xfs_inode *ip; /* incore inode pointer */
64 struct inode *inode;
65 struct xfs_bulkstat *buf = bc->buf;
66 int error = -EINVAL;
67
68 if (xfs_internal_inum(mp, ino))
69 goto out_advance;
70
71 error = xfs_iget(mp, tp, ino,
72 (XFS_IGET_DONTCACHE | XFS_IGET_UNTRUSTED),
73 XFS_ILOCK_SHARED, &ip);
74 if (error == -ENOENT || error == -EINVAL)
75 goto out_advance;
76 if (error)
77 goto out;
78
79 ASSERT(ip != NULL);
80 ASSERT(ip->i_imap.im_blkno != 0);
81 inode = VFS_I(ip);
82
83 /* xfs_iget returns the following without needing
84 * further change.
85 */
86 buf->bs_projectid = ip->i_projid;
87 buf->bs_ino = ino;
88 buf->bs_uid = from_kuid(sb_userns, i_uid_into_mnt(mnt_userns, inode));
89 buf->bs_gid = from_kgid(sb_userns, i_gid_into_mnt(mnt_userns, inode));
90 buf->bs_size = ip->i_disk_size;
91
92 buf->bs_nlink = inode->i_nlink;
93 buf->bs_atime = inode->i_atime.tv_sec;
94 buf->bs_atime_nsec = inode->i_atime.tv_nsec;
95 buf->bs_mtime = inode->i_mtime.tv_sec;
96 buf->bs_mtime_nsec = inode->i_mtime.tv_nsec;
97 buf->bs_ctime = inode->i_ctime.tv_sec;
98 buf->bs_ctime_nsec = inode->i_ctime.tv_nsec;
99 buf->bs_gen = inode->i_generation;
100 buf->bs_mode = inode->i_mode;
101
102 buf->bs_xflags = xfs_ip2xflags(ip);
103 buf->bs_extsize_blks = ip->i_extsize;
104 buf->bs_extents = xfs_ifork_nextents(&ip->i_df);
105 xfs_bulkstat_health(ip, buf);
106 buf->bs_aextents = xfs_ifork_nextents(ip->i_afp);
107 buf->bs_forkoff = XFS_IFORK_BOFF(ip);
108 buf->bs_version = XFS_BULKSTAT_VERSION_V5;
109
110 if (xfs_sb_version_has_v3inode(&mp->m_sb)) {
111 buf->bs_btime = ip->i_crtime.tv_sec;
112 buf->bs_btime_nsec = ip->i_crtime.tv_nsec;
113 if (ip->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE)
114 buf->bs_cowextsize_blks = ip->i_cowextsize;
115 }
116
117 switch (ip->i_df.if_format) {
118 case XFS_DINODE_FMT_DEV:
119 buf->bs_rdev = sysv_encode_dev(inode->i_rdev);
120 buf->bs_blksize = BLKDEV_IOSIZE;
121 buf->bs_blocks = 0;
122 break;
123 case XFS_DINODE_FMT_LOCAL:
124 buf->bs_rdev = 0;
125 buf->bs_blksize = mp->m_sb.sb_blocksize;
126 buf->bs_blocks = 0;
127 break;
128 case XFS_DINODE_FMT_EXTENTS:
129 case XFS_DINODE_FMT_BTREE:
130 buf->bs_rdev = 0;
131 buf->bs_blksize = mp->m_sb.sb_blocksize;
132 buf->bs_blocks = ip->i_nblocks + ip->i_delayed_blks;
133 break;
134 }
135 xfs_iunlock(ip, XFS_ILOCK_SHARED);
136 xfs_irele(ip);
137
138 error = bc->formatter(bc->breq, buf);
139 if (error == -ECANCELED)
140 goto out_advance;
141 if (error)
142 goto out;
143
144out_advance:
145 /*
146 * Advance the cursor to the inode that comes after the one we just
147 * looked at. We want the caller to move along if the bulkstat
148 * information was copied successfully; if we tried to grab the inode
149 * but it's no longer allocated; or if it's internal metadata.
150 */
151 bc->breq->startino = ino + 1;
152out:
153 return error;
154}
155
156/* Bulkstat a single inode. */
157int
158xfs_bulkstat_one(
159 struct xfs_ibulk *breq,
160 bulkstat_one_fmt_pf formatter)
161{
162 struct xfs_bstat_chunk bc = {
163 .formatter = formatter,
164 .breq = breq,
165 };
166 int error;
167
168 if (breq->mnt_userns != &init_user_ns) {
169 xfs_warn_ratelimited(breq->mp,
170 "bulkstat not supported inside of idmapped mounts.");
171 return -EINVAL;
172 }
173
174 ASSERT(breq->icount == 1);
175
176 bc.buf = kmem_zalloc(sizeof(struct xfs_bulkstat),
177 KM_MAYFAIL);
178 if (!bc.buf)
179 return -ENOMEM;
180
181 error = xfs_bulkstat_one_int(breq->mp, breq->mnt_userns, NULL,
182 breq->startino, &bc);
183
184 kmem_free(bc.buf);
185
186 /*
187 * If we reported one inode to userspace then we abort because we hit
188 * the end of the buffer. Don't leak that back to userspace.
189 */
190 if (error == -ECANCELED)
191 error = 0;
192
193 return error;
194}
195
196static int
197xfs_bulkstat_iwalk(
198 struct xfs_mount *mp,
199 struct xfs_trans *tp,
200 xfs_ino_t ino,
201 void *data)
202{
203 struct xfs_bstat_chunk *bc = data;
204 int error;
205
206 error = xfs_bulkstat_one_int(mp, bc->breq->mnt_userns, tp, ino, data);
207 /* bulkstat just skips over missing inodes */
208 if (error == -ENOENT || error == -EINVAL)
209 return 0;
210 return error;
211}
212
213/*
214 * Check the incoming lastino parameter.
215 *
216 * We allow any inode value that could map to physical space inside the
217 * filesystem because if there are no inodes there, bulkstat moves on to the
218 * next chunk. In other words, the magic agino value of zero takes us to the
219 * first chunk in the AG, and an agino value past the end of the AG takes us to
220 * the first chunk in the next AG.
221 *
222 * Therefore we can end early if the requested inode is beyond the end of the
223 * filesystem or doesn't map properly.
224 */
225static inline bool
226xfs_bulkstat_already_done(
227 struct xfs_mount *mp,
228 xfs_ino_t startino)
229{
230 xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, startino);
231 xfs_agino_t agino = XFS_INO_TO_AGINO(mp, startino);
232
233 return agno >= mp->m_sb.sb_agcount ||
234 startino != XFS_AGINO_TO_INO(mp, agno, agino);
235}
236
237/* Return stat information in bulk (by-inode) for the filesystem. */
238int
239xfs_bulkstat(
240 struct xfs_ibulk *breq,
241 bulkstat_one_fmt_pf formatter)
242{
243 struct xfs_bstat_chunk bc = {
244 .formatter = formatter,
245 .breq = breq,
246 };
247 int error;
248
249 if (breq->mnt_userns != &init_user_ns) {
250 xfs_warn_ratelimited(breq->mp,
251 "bulkstat not supported inside of idmapped mounts.");
252 return -EINVAL;
253 }
254 if (xfs_bulkstat_already_done(breq->mp, breq->startino))
255 return 0;
256
257 bc.buf = kmem_zalloc(sizeof(struct xfs_bulkstat),
258 KM_MAYFAIL);
259 if (!bc.buf)
260 return -ENOMEM;
261
262 error = xfs_iwalk(breq->mp, NULL, breq->startino, breq->flags,
263 xfs_bulkstat_iwalk, breq->icount, &bc);
264
265 kmem_free(bc.buf);
266
267 /*
268 * We found some inodes, so clear the error status and return them.
269 * The lastino pointer will point directly at the inode that triggered
270 * any error that occurred, so on the next call the error will be
271 * triggered again and propagated to userspace as there will be no
272 * formatted inodes in the buffer.
273 */
274 if (breq->ocount > 0)
275 error = 0;
276
277 return error;
278}
279
280/* Convert bulkstat (v5) to bstat (v1). */
281void
282xfs_bulkstat_to_bstat(
283 struct xfs_mount *mp,
284 struct xfs_bstat *bs1,
285 const struct xfs_bulkstat *bstat)
286{
287 /* memset is needed here because of padding holes in the structure. */
288 memset(bs1, 0, sizeof(struct xfs_bstat));
289 bs1->bs_ino = bstat->bs_ino;
290 bs1->bs_mode = bstat->bs_mode;
291 bs1->bs_nlink = bstat->bs_nlink;
292 bs1->bs_uid = bstat->bs_uid;
293 bs1->bs_gid = bstat->bs_gid;
294 bs1->bs_rdev = bstat->bs_rdev;
295 bs1->bs_blksize = bstat->bs_blksize;
296 bs1->bs_size = bstat->bs_size;
297 bs1->bs_atime.tv_sec = bstat->bs_atime;
298 bs1->bs_mtime.tv_sec = bstat->bs_mtime;
299 bs1->bs_ctime.tv_sec = bstat->bs_ctime;
300 bs1->bs_atime.tv_nsec = bstat->bs_atime_nsec;
301 bs1->bs_mtime.tv_nsec = bstat->bs_mtime_nsec;
302 bs1->bs_ctime.tv_nsec = bstat->bs_ctime_nsec;
303 bs1->bs_blocks = bstat->bs_blocks;
304 bs1->bs_xflags = bstat->bs_xflags;
305 bs1->bs_extsize = XFS_FSB_TO_B(mp, bstat->bs_extsize_blks);
306 bs1->bs_extents = bstat->bs_extents;
307 bs1->bs_gen = bstat->bs_gen;
308 bs1->bs_projid_lo = bstat->bs_projectid & 0xFFFF;
309 bs1->bs_forkoff = bstat->bs_forkoff;
310 bs1->bs_projid_hi = bstat->bs_projectid >> 16;
311 bs1->bs_sick = bstat->bs_sick;
312 bs1->bs_checked = bstat->bs_checked;
313 bs1->bs_cowextsize = XFS_FSB_TO_B(mp, bstat->bs_cowextsize_blks);
314 bs1->bs_dmevmask = 0;
315 bs1->bs_dmstate = 0;
316 bs1->bs_aextents = bstat->bs_aextents;
317}
318
319struct xfs_inumbers_chunk {
320 inumbers_fmt_pf formatter;
321 struct xfs_ibulk *breq;
322};
323
324/*
325 * INUMBERS
326 * ========
327 * This is how we export inode btree records to userspace, so that XFS tools
328 * can figure out where inodes are allocated.
329 */
330
331/*
332 * Format the inode group structure and report it somewhere.
333 *
334 * Similar to xfs_bulkstat_one_int, lastino is the inode cursor as we walk
335 * through the filesystem so we move it forward unless there was a runtime
336 * error. If the formatter tells us the buffer is now full we also move the
337 * cursor forward and abort the walk.
338 */
339STATIC int
340xfs_inumbers_walk(
341 struct xfs_mount *mp,
342 struct xfs_trans *tp,
343 xfs_agnumber_t agno,
344 const struct xfs_inobt_rec_incore *irec,
345 void *data)
346{
347 struct xfs_inumbers inogrp = {
348 .xi_startino = XFS_AGINO_TO_INO(mp, agno, irec->ir_startino),
349 .xi_alloccount = irec->ir_count - irec->ir_freecount,
350 .xi_allocmask = ~irec->ir_free,
351 .xi_version = XFS_INUMBERS_VERSION_V5,
352 };
353 struct xfs_inumbers_chunk *ic = data;
354 int error;
355
356 error = ic->formatter(ic->breq, &inogrp);
357 if (error && error != -ECANCELED)
358 return error;
359
360 ic->breq->startino = XFS_AGINO_TO_INO(mp, agno, irec->ir_startino) +
361 XFS_INODES_PER_CHUNK;
362 return error;
363}
364
365/*
366 * Return inode number table for the filesystem.
367 */
368int
369xfs_inumbers(
370 struct xfs_ibulk *breq,
371 inumbers_fmt_pf formatter)
372{
373 struct xfs_inumbers_chunk ic = {
374 .formatter = formatter,
375 .breq = breq,
376 };
377 int error = 0;
378
379 if (xfs_bulkstat_already_done(breq->mp, breq->startino))
380 return 0;
381
382 error = xfs_inobt_walk(breq->mp, NULL, breq->startino, breq->flags,
383 xfs_inumbers_walk, breq->icount, &ic);
384
385 /*
386 * We found some inode groups, so clear the error status and return
387 * them. The lastino pointer will point directly at the inode that
388 * triggered any error that occurred, so on the next call the error
389 * will be triggered again and propagated to userspace as there will be
390 * no formatted inode groups in the buffer.
391 */
392 if (breq->ocount > 0)
393 error = 0;
394
395 return error;
396}
397
398/* Convert an inumbers (v5) struct to a inogrp (v1) struct. */
399void
400xfs_inumbers_to_inogrp(
401 struct xfs_inogrp *ig1,
402 const struct xfs_inumbers *ig)
403{
404 /* memset is needed here because of padding holes in the structure. */
405 memset(ig1, 0, sizeof(struct xfs_inogrp));
406 ig1->xi_startino = ig->xi_startino;
407 ig1->xi_alloccount = ig->xi_alloccount;
408 ig1->xi_allocmask = ig->xi_allocmask;
409}