1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
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"
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
33 struct xfs_bstat_chunk {
34 bulkstat_one_fmt_pf formatter;
35 struct xfs_ibulk *breq;
36 struct xfs_bulkstat *buf;
40 * Fill out the bulkstat info for a single inode and report it somewhere.
42 * bc->breq->lastino is effectively the inode cursor as we walk through the
43 * filesystem. Therefore, we update it any time we need to move the cursor
44 * forward, regardless of whether or not we're sending any bstat information
45 * back to userspace. If the inode is internal metadata or, has been freed
46 * out from under us, we just simply keep going.
48 * However, if any other type of error happens we want to stop right where we
49 * are so that userspace will call back with exact number of the bad inode and
50 * we can send back an error code.
52 * Note that if the formatter tells us there's no space left in the buffer we
53 * move the cursor forward and abort the walk.
58 struct user_namespace *mnt_userns,
61 struct xfs_bstat_chunk *bc)
63 struct user_namespace *sb_userns = mp->m_super->s_user_ns;
64 struct xfs_inode *ip; /* incore inode pointer */
66 struct xfs_bulkstat *buf = bc->buf;
67 xfs_extnum_t nextents;
70 if (xfs_internal_inum(mp, ino))
73 error = xfs_iget(mp, tp, ino,
74 (XFS_IGET_DONTCACHE | XFS_IGET_UNTRUSTED),
75 XFS_ILOCK_SHARED, &ip);
76 if (error == -ENOENT || error == -EINVAL)
82 ASSERT(ip->i_imap.im_blkno != 0);
85 /* xfs_iget returns the following without needing
88 buf->bs_projectid = ip->i_projid;
90 buf->bs_uid = from_kuid(sb_userns, i_uid_into_mnt(mnt_userns, inode));
91 buf->bs_gid = from_kgid(sb_userns, i_gid_into_mnt(mnt_userns, inode));
92 buf->bs_size = ip->i_disk_size;
94 buf->bs_nlink = inode->i_nlink;
95 buf->bs_atime = inode->i_atime.tv_sec;
96 buf->bs_atime_nsec = inode->i_atime.tv_nsec;
97 buf->bs_mtime = inode->i_mtime.tv_sec;
98 buf->bs_mtime_nsec = inode->i_mtime.tv_nsec;
99 buf->bs_ctime = inode->i_ctime.tv_sec;
100 buf->bs_ctime_nsec = inode->i_ctime.tv_nsec;
101 buf->bs_gen = inode->i_generation;
102 buf->bs_mode = inode->i_mode;
104 buf->bs_xflags = xfs_ip2xflags(ip);
105 buf->bs_extsize_blks = ip->i_extsize;
107 nextents = xfs_ifork_nextents(&ip->i_df);
108 if (!(bc->breq->flags & XFS_IBULK_NREXT64))
109 buf->bs_extents = min(nextents, XFS_MAX_EXTCNT_DATA_FORK_SMALL);
111 buf->bs_extents64 = nextents;
113 xfs_bulkstat_health(ip, buf);
114 buf->bs_aextents = xfs_ifork_nextents(ip->i_afp);
115 buf->bs_forkoff = XFS_IFORK_BOFF(ip);
116 buf->bs_version = XFS_BULKSTAT_VERSION_V5;
118 if (xfs_has_v3inodes(mp)) {
119 buf->bs_btime = ip->i_crtime.tv_sec;
120 buf->bs_btime_nsec = ip->i_crtime.tv_nsec;
121 if (ip->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE)
122 buf->bs_cowextsize_blks = ip->i_cowextsize;
125 switch (ip->i_df.if_format) {
126 case XFS_DINODE_FMT_DEV:
127 buf->bs_rdev = sysv_encode_dev(inode->i_rdev);
128 buf->bs_blksize = BLKDEV_IOSIZE;
131 case XFS_DINODE_FMT_LOCAL:
133 buf->bs_blksize = mp->m_sb.sb_blocksize;
136 case XFS_DINODE_FMT_EXTENTS:
137 case XFS_DINODE_FMT_BTREE:
139 buf->bs_blksize = mp->m_sb.sb_blocksize;
140 buf->bs_blocks = ip->i_nblocks + ip->i_delayed_blks;
143 xfs_iunlock(ip, XFS_ILOCK_SHARED);
146 error = bc->formatter(bc->breq, buf);
147 if (error == -ECANCELED)
154 * Advance the cursor to the inode that comes after the one we just
155 * looked at. We want the caller to move along if the bulkstat
156 * information was copied successfully; if we tried to grab the inode
157 * but it's no longer allocated; or if it's internal metadata.
159 bc->breq->startino = ino + 1;
164 /* Bulkstat a single inode. */
167 struct xfs_ibulk *breq,
168 bulkstat_one_fmt_pf formatter)
170 struct xfs_bstat_chunk bc = {
171 .formatter = formatter,
174 struct xfs_trans *tp;
177 if (breq->mnt_userns != &init_user_ns) {
178 xfs_warn_ratelimited(breq->mp,
179 "bulkstat not supported inside of idmapped mounts.");
183 ASSERT(breq->icount == 1);
185 bc.buf = kmem_zalloc(sizeof(struct xfs_bulkstat),
191 * Grab an empty transaction so that we can use its recursive buffer
192 * locking abilities to detect cycles in the inobt without deadlocking.
194 error = xfs_trans_alloc_empty(breq->mp, &tp);
198 error = xfs_bulkstat_one_int(breq->mp, breq->mnt_userns, tp,
199 breq->startino, &bc);
200 xfs_trans_cancel(tp);
205 * If we reported one inode to userspace then we abort because we hit
206 * the end of the buffer. Don't leak that back to userspace.
208 if (error == -ECANCELED)
216 struct xfs_mount *mp,
217 struct xfs_trans *tp,
221 struct xfs_bstat_chunk *bc = data;
224 error = xfs_bulkstat_one_int(mp, bc->breq->mnt_userns, tp, ino, data);
225 /* bulkstat just skips over missing inodes */
226 if (error == -ENOENT || error == -EINVAL)
232 * Check the incoming lastino parameter.
234 * We allow any inode value that could map to physical space inside the
235 * filesystem because if there are no inodes there, bulkstat moves on to the
236 * next chunk. In other words, the magic agino value of zero takes us to the
237 * first chunk in the AG, and an agino value past the end of the AG takes us to
238 * the first chunk in the next AG.
240 * Therefore we can end early if the requested inode is beyond the end of the
241 * filesystem or doesn't map properly.
244 xfs_bulkstat_already_done(
245 struct xfs_mount *mp,
248 xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, startino);
249 xfs_agino_t agino = XFS_INO_TO_AGINO(mp, startino);
251 return agno >= mp->m_sb.sb_agcount ||
252 startino != XFS_AGINO_TO_INO(mp, agno, agino);
255 /* Return stat information in bulk (by-inode) for the filesystem. */
258 struct xfs_ibulk *breq,
259 bulkstat_one_fmt_pf formatter)
261 struct xfs_bstat_chunk bc = {
262 .formatter = formatter,
265 struct xfs_trans *tp;
266 unsigned int iwalk_flags = 0;
269 if (breq->mnt_userns != &init_user_ns) {
270 xfs_warn_ratelimited(breq->mp,
271 "bulkstat not supported inside of idmapped mounts.");
274 if (xfs_bulkstat_already_done(breq->mp, breq->startino))
277 bc.buf = kmem_zalloc(sizeof(struct xfs_bulkstat),
283 * Grab an empty transaction so that we can use its recursive buffer
284 * locking abilities to detect cycles in the inobt without deadlocking.
286 error = xfs_trans_alloc_empty(breq->mp, &tp);
290 if (breq->flags & XFS_IBULK_SAME_AG)
291 iwalk_flags |= XFS_IWALK_SAME_AG;
293 error = xfs_iwalk(breq->mp, tp, breq->startino, iwalk_flags,
294 xfs_bulkstat_iwalk, breq->icount, &bc);
295 xfs_trans_cancel(tp);
300 * We found some inodes, so clear the error status and return them.
301 * The lastino pointer will point directly at the inode that triggered
302 * any error that occurred, so on the next call the error will be
303 * triggered again and propagated to userspace as there will be no
304 * formatted inodes in the buffer.
306 if (breq->ocount > 0)
312 /* Convert bulkstat (v5) to bstat (v1). */
314 xfs_bulkstat_to_bstat(
315 struct xfs_mount *mp,
316 struct xfs_bstat *bs1,
317 const struct xfs_bulkstat *bstat)
319 /* memset is needed here because of padding holes in the structure. */
320 memset(bs1, 0, sizeof(struct xfs_bstat));
321 bs1->bs_ino = bstat->bs_ino;
322 bs1->bs_mode = bstat->bs_mode;
323 bs1->bs_nlink = bstat->bs_nlink;
324 bs1->bs_uid = bstat->bs_uid;
325 bs1->bs_gid = bstat->bs_gid;
326 bs1->bs_rdev = bstat->bs_rdev;
327 bs1->bs_blksize = bstat->bs_blksize;
328 bs1->bs_size = bstat->bs_size;
329 bs1->bs_atime.tv_sec = bstat->bs_atime;
330 bs1->bs_mtime.tv_sec = bstat->bs_mtime;
331 bs1->bs_ctime.tv_sec = bstat->bs_ctime;
332 bs1->bs_atime.tv_nsec = bstat->bs_atime_nsec;
333 bs1->bs_mtime.tv_nsec = bstat->bs_mtime_nsec;
334 bs1->bs_ctime.tv_nsec = bstat->bs_ctime_nsec;
335 bs1->bs_blocks = bstat->bs_blocks;
336 bs1->bs_xflags = bstat->bs_xflags;
337 bs1->bs_extsize = XFS_FSB_TO_B(mp, bstat->bs_extsize_blks);
338 bs1->bs_extents = bstat->bs_extents;
339 bs1->bs_gen = bstat->bs_gen;
340 bs1->bs_projid_lo = bstat->bs_projectid & 0xFFFF;
341 bs1->bs_forkoff = bstat->bs_forkoff;
342 bs1->bs_projid_hi = bstat->bs_projectid >> 16;
343 bs1->bs_sick = bstat->bs_sick;
344 bs1->bs_checked = bstat->bs_checked;
345 bs1->bs_cowextsize = XFS_FSB_TO_B(mp, bstat->bs_cowextsize_blks);
346 bs1->bs_dmevmask = 0;
348 bs1->bs_aextents = bstat->bs_aextents;
351 struct xfs_inumbers_chunk {
352 inumbers_fmt_pf formatter;
353 struct xfs_ibulk *breq;
359 * This is how we export inode btree records to userspace, so that XFS tools
360 * can figure out where inodes are allocated.
364 * Format the inode group structure and report it somewhere.
366 * Similar to xfs_bulkstat_one_int, lastino is the inode cursor as we walk
367 * through the filesystem so we move it forward unless there was a runtime
368 * error. If the formatter tells us the buffer is now full we also move the
369 * cursor forward and abort the walk.
373 struct xfs_mount *mp,
374 struct xfs_trans *tp,
376 const struct xfs_inobt_rec_incore *irec,
379 struct xfs_inumbers inogrp = {
380 .xi_startino = XFS_AGINO_TO_INO(mp, agno, irec->ir_startino),
381 .xi_alloccount = irec->ir_count - irec->ir_freecount,
382 .xi_allocmask = ~irec->ir_free,
383 .xi_version = XFS_INUMBERS_VERSION_V5,
385 struct xfs_inumbers_chunk *ic = data;
388 error = ic->formatter(ic->breq, &inogrp);
389 if (error && error != -ECANCELED)
392 ic->breq->startino = XFS_AGINO_TO_INO(mp, agno, irec->ir_startino) +
393 XFS_INODES_PER_CHUNK;
398 * Return inode number table for the filesystem.
402 struct xfs_ibulk *breq,
403 inumbers_fmt_pf formatter)
405 struct xfs_inumbers_chunk ic = {
406 .formatter = formatter,
409 struct xfs_trans *tp;
412 if (xfs_bulkstat_already_done(breq->mp, breq->startino))
416 * Grab an empty transaction so that we can use its recursive buffer
417 * locking abilities to detect cycles in the inobt without deadlocking.
419 error = xfs_trans_alloc_empty(breq->mp, &tp);
423 error = xfs_inobt_walk(breq->mp, tp, breq->startino, breq->flags,
424 xfs_inumbers_walk, breq->icount, &ic);
425 xfs_trans_cancel(tp);
429 * We found some inode groups, so clear the error status and return
430 * them. The lastino pointer will point directly at the inode that
431 * triggered any error that occurred, so on the next call the error
432 * will be triggered again and propagated to userspace as there will be
433 * no formatted inode groups in the buffer.
435 if (breq->ocount > 0)
441 /* Convert an inumbers (v5) struct to a inogrp (v1) struct. */
443 xfs_inumbers_to_inogrp(
444 struct xfs_inogrp *ig1,
445 const struct xfs_inumbers *ig)
447 /* memset is needed here because of padding holes in the structure. */
448 memset(ig1, 0, sizeof(struct xfs_inogrp));
449 ig1->xi_startino = ig->xi_startino;
450 ig1->xi_alloccount = ig->xi_alloccount;
451 ig1->xi_allocmask = ig->xi_allocmask;