mkquota.c revision 5027751530980c61e313d265b1367fee90589cf4 
1/*
2 * mkquota.c --- create quota files for a filesystem
3 *
4 * Aditya Kali <adityakali@google.com>
5 */
6#include "config.h"
7#include <sys/types.h>
8#include <sys/stat.h>
9#include <unistd.h>
10#include <errno.h>
11#include <string.h>
12#include <fcntl.h>
13
14#include "ext2fs/ext2_fs.h"
15#include "ext2fs/ext2fs.h"
16#include "e2p/e2p.h"
17
18#include "quotaio.h"
19#include "quotaio_v2.h"
20#include "quotaio_tree.h"
21#include "mkquota.h"
22#include "common.h"
23
24/* Needed for architectures where sizeof(int) != sizeof(void *) */
25#define UINT_TO_VOIDPTR(val)  ((void *)(intptr_t)(val))
26#define VOIDPTR_TO_UINT(ptr)  ((unsigned int)(intptr_t)(ptr))
27
28static void print_inode(struct ext2_inode *inode)
29{
30	if (!inode)
31		return;
32
33	fprintf(stderr, "  i_mode = %d\n", inode->i_mode);
34	fprintf(stderr, "  i_uid = %d\n", inode->i_uid);
35	fprintf(stderr, "  i_size = %d\n", inode->i_size);
36	fprintf(stderr, "  i_atime = %d\n", inode->i_atime);
37	fprintf(stderr, "  i_ctime = %d\n", inode->i_ctime);
38	fprintf(stderr, "  i_mtime = %d\n", inode->i_mtime);
39	fprintf(stderr, "  i_dtime = %d\n", inode->i_dtime);
40	fprintf(stderr, "  i_gid = %d\n", inode->i_gid);
41	fprintf(stderr, "  i_links_count = %d\n", inode->i_links_count);
42	fprintf(stderr, "  i_blocks = %d\n", inode->i_blocks);
43	fprintf(stderr, "  i_flags = %d\n", inode->i_flags);
44
45	return;
46}
47
48/*
49 * Returns 0 if not able to find the quota file, otherwise returns its
50 * inode number.
51 */
52int quota_file_exists(ext2_filsys fs, int qtype, int fmt)
53{
54	char qf_name[256];
55	errcode_t ret;
56	ext2_ino_t ino;
57
58	if (qtype >= MAXQUOTAS)
59		return -EINVAL;
60
61	quota_get_qf_name(qtype, QFMT_VFS_V1, qf_name);
62
63	ret = ext2fs_lookup(fs, EXT2_ROOT_INO, qf_name, strlen(qf_name), 0,
64			    &ino);
65	if (ret)
66		return 0;
67
68	return ino;
69}
70
71/*
72 * Set the value for reserved quota inode number field in superblock.
73 */
74void quota_set_sb_inum(ext2_filsys fs, ext2_ino_t ino, int qtype)
75{
76	ext2_ino_t *inump;
77
78	inump = (qtype == USRQUOTA) ? &fs->super->s_usr_quota_inum :
79		&fs->super->s_grp_quota_inum;
80
81	log_debug("setting quota ino in superblock: ino=%u, type=%d", ino,
82		 qtype);
83	*inump = ino;
84	ext2fs_mark_super_dirty(fs);
85}
86
87errcode_t quota_remove_inode(ext2_filsys fs, int qtype)
88{
89	ext2_ino_t qf_ino;
90
91	ext2fs_read_bitmaps(fs);
92	qf_ino = (qtype == USRQUOTA) ? fs->super->s_usr_quota_inum :
93		fs->super->s_grp_quota_inum;
94	quota_set_sb_inum(fs, 0, qtype);
95	/* Truncate the inode only if its a reserved one. */
96	if (qf_ino < EXT2_FIRST_INODE(fs->super))
97		quota_inode_truncate(fs, qf_ino);
98
99	ext2fs_mark_super_dirty(fs);
100	ext2fs_write_bitmaps(fs);
101	return 0;
102}
103
104static void write_dquots(dict_t *dict, struct quota_handle *qh)
105{
106	dnode_t		*n;
107	struct dquot	*dq;
108
109	for (n = dict_first(dict); n; n = dict_next(dict, n)) {
110		dq = dnode_get(n);
111		if (dq) {
112			dq->dq_h = qh;
113			update_grace_times(dq);
114			qh->qh_ops->commit_dquot(dq);
115		}
116	}
117}
118
119errcode_t quota_write_inode(quota_ctx_t qctx, int qtype)
120{
121	int		retval = 0, i;
122	dict_t		*dict;
123	ext2_filsys	fs;
124	struct quota_handle *h;
125	int		fmt = QFMT_VFS_V1;
126
127	if (!qctx)
128		return 0;
129
130	fs = qctx->fs;
131	retval = ext2fs_get_mem(sizeof(struct quota_handle), &h);
132	if (retval) {
133		log_err("Unable to allocate quota handle", "");
134		goto out;
135	}
136
137	ext2fs_read_bitmaps(fs);
138
139	for (i = 0; i < MAXQUOTAS; i++) {
140		if ((qtype != -1) && (i != qtype))
141			continue;
142
143		dict = qctx->quota_dict[i];
144		if (!dict)
145			continue;
146
147		retval = quota_file_create(h, fs, i, fmt);
148		if (retval < 0) {
149			log_err("Cannot initialize io on quotafile", "");
150			continue;
151		}
152
153		write_dquots(dict, h);
154		retval = quota_file_close(h);
155		if (retval < 0) {
156			log_err("Cannot finish IO on new quotafile: %s",
157				strerror(errno));
158			if (h->qh_qf.e2_file)
159				ext2fs_file_close(h->qh_qf.e2_file);
160			quota_inode_truncate(fs, h->qh_qf.ino);
161			continue;
162		}
163
164		/* Set quota inode numbers in superblock. */
165		quota_set_sb_inum(fs, h->qh_qf.ino, i);
166		ext2fs_mark_super_dirty(fs);
167		ext2fs_mark_bb_dirty(fs);
168		fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
169	}
170
171	ext2fs_write_bitmaps(fs);
172out:
173	if (h)
174		ext2fs_free_mem(&h);
175	return retval;
176}
177
178/******************************************************************/
179/* Helper functions for computing quota in memory.                */
180/******************************************************************/
181
182static int dict_uint_cmp(const void *a, const void *b)
183{
184	unsigned int	c, d;
185
186	c = VOIDPTR_TO_UINT(a);
187	d = VOIDPTR_TO_UINT(b);
188
189	return c - d;
190}
191
192static inline qid_t get_qid(struct ext2_inode *inode, int qtype)
193{
194	if (qtype == USRQUOTA)
195		return inode_uid(*inode);
196	return inode_gid(*inode);
197}
198
199static void quota_dnode_free(dnode_t *node,
200			     void *context EXT2FS_ATTR((unused)))
201{
202	void *ptr = node ? dnode_get(node) : 0;
203
204	ext2fs_free_mem(&ptr);
205	free(node);
206}
207
208/*
209 * Set up the quota tracking data structures.
210 */
211errcode_t quota_init_context(quota_ctx_t *qctx, ext2_filsys fs, int qtype)
212{
213	int	i, err = 0;
214	dict_t	*dict;
215	quota_ctx_t ctx;
216
217	err = ext2fs_get_mem(sizeof(struct quota_ctx), &ctx);
218	if (err) {
219		log_err("Failed to allocate quota context", "");
220		return err;
221	}
222
223	memset(ctx, 0, sizeof(struct quota_ctx));
224	for (i = 0; i < MAXQUOTAS; i++) {
225		if ((qtype != -1) && (i != qtype))
226			continue;
227		err = ext2fs_get_mem(sizeof(dict_t), &dict);
228		if (err) {
229			log_err("Failed to allocate dictionary", "");
230			return err;
231		}
232		ctx->quota_dict[i] = dict;
233		dict_init(dict, DICTCOUNT_T_MAX, dict_uint_cmp);
234		dict_set_allocator(dict, NULL, quota_dnode_free, NULL);
235	}
236
237	ctx->fs = fs;
238	*qctx = ctx;
239	return 0;
240}
241
242void quota_release_context(quota_ctx_t *qctx)
243{
244	dict_t	*dict;
245	int	i;
246	quota_ctx_t ctx;
247
248	if (!qctx)
249		return;
250
251	ctx = *qctx;
252	for (i = 0; i < MAXQUOTAS; i++) {
253		dict = ctx->quota_dict[i];
254		ctx->quota_dict[i] = 0;
255		if (dict) {
256			dict_free_nodes(dict);
257			free(dict);
258		}
259	}
260	*qctx = NULL;
261	free(ctx);
262}
263
264static struct dquot *get_dq(dict_t *dict, __u32 key)
265{
266	struct dquot	*dq;
267	dnode_t		*n;
268
269	n = dict_lookup(dict, UINT_TO_VOIDPTR(key));
270	if (n)
271		dq = dnode_get(n);
272	else {
273		if (ext2fs_get_mem(sizeof(struct dquot), &dq)) {
274			log_err("Unable to allocate dquot", "");
275			return NULL;
276		}
277		memset(dq, 0, sizeof(struct dquot));
278		dict_alloc_insert(dict, UINT_TO_VOIDPTR(key), dq);
279		dq->dq_id = key;
280	}
281	return dq;
282}
283
284
285/*
286 * Called to update the blocks used by a particular inode
287 */
288void quota_data_add(quota_ctx_t qctx, struct ext2_inode *inode, ext2_ino_t ino,
289		    qsize_t space)
290{
291	struct dquot	*dq;
292	dict_t		*dict;
293	int		i;
294
295	if (!qctx)
296		return;
297
298	log_debug("ADD_DATA: Inode: %u, UID/GID: %u/%u, space: %ld", ino,
299			inode_uid(*inode),
300			inode_gid(*inode), space);
301	for (i = 0; i < MAXQUOTAS; i++) {
302		dict = qctx->quota_dict[i];
303		if (dict) {
304			dq = get_dq(dict, get_qid(inode, i));
305			if (dq)
306				dq->dq_dqb.dqb_curspace += space;
307		}
308	}
309}
310
311/*
312 * Called to remove some blocks used by a particular inode
313 */
314void quota_data_sub(quota_ctx_t qctx, struct ext2_inode *inode, ext2_ino_t ino,
315		    qsize_t space)
316{
317	struct dquot	*dq;
318	dict_t		*dict;
319	int		i;
320
321	if (!qctx)
322		return;
323
324	log_debug("SUB_DATA: Inode: %u, UID/GID: %u/%u, space: %ld", ino,
325			inode_uid(*inode),
326			inode_gid(*inode), space);
327	for (i = 0; i < MAXQUOTAS; i++) {
328		dict = qctx->quota_dict[i];
329		if (dict) {
330			dq = get_dq(dict, get_qid(inode, i));
331			dq->dq_dqb.dqb_curspace -= space;
332		}
333	}
334}
335
336/*
337 * Called to count the files used by an inode's user/group
338 */
339void quota_data_inodes(quota_ctx_t qctx, struct ext2_inode *inode,
340		       ext2_ino_t ino, int adjust)
341{
342	struct dquot	*dq;
343	dict_t		*dict;
344	int		i;
345
346	if (!qctx)
347		return;
348
349	log_debug("ADJ_INODE: Inode: %u, UID/GID: %u/%u, adjust: %d", ino,
350			inode_uid(*inode),
351			inode_gid(*inode), adjust);
352	for (i = 0; i < MAXQUOTAS; i++) {
353		dict = qctx->quota_dict[i];
354		if (dict) {
355			dq = get_dq(dict, get_qid(inode, i));
356			dq->dq_dqb.dqb_curinodes += adjust;
357		}
358	}
359}
360
361errcode_t quota_compute_usage(quota_ctx_t qctx)
362{
363	ext2_filsys fs;
364	ext2_ino_t ino;
365	errcode_t ret;
366	struct ext2_inode inode;
367	qsize_t space;
368	ext2_inode_scan scan;
369
370	if (!qctx)
371		return 0;
372
373	fs = qctx->fs;
374	ret = ext2fs_open_inode_scan(fs, 0, &scan);
375	if (ret) {
376		log_err("while opening inode scan. ret=%ld", ret);
377		return ret;
378	}
379
380	while (1) {
381		ret = ext2fs_get_next_inode(scan, &ino, &inode);
382		if (ret) {
383			log_err("while getting next inode. ret=%ld", ret);
384			ext2fs_close_inode_scan(scan);
385			return ret;
386		}
387		if (ino == 0)
388			break;
389		if (inode.i_links_count &&
390		    (ino == EXT2_ROOT_INO ||
391		     ino >= EXT2_FIRST_INODE(fs->super))) {
392			space = ext2fs_inode_i_blocks(fs, &inode) << 9;
393			quota_data_add(qctx, &inode, ino, space);
394			quota_data_inodes(qctx, &inode, ino, +1);
395		}
396	}
397
398	ext2fs_close_inode_scan(scan);
399
400	return 0;
401}
402
403struct scan_dquots_data {
404	dict_t		*quota_dict;
405	int             update_limits; /* update limits from disk */
406	int		update_usage;
407	int		usage_is_inconsistent;
408};
409
410static int scan_dquots_callback(struct dquot *dquot, void *cb_data)
411{
412	struct scan_dquots_data *scan_data = cb_data;
413	dict_t *quota_dict = scan_data->quota_dict;
414	struct dquot *dq;
415
416	dq = get_dq(quota_dict, dquot->dq_id);
417	dq->dq_id = dquot->dq_id;
418	dq->dq_dqb.u.v2_mdqb.dqb_off = dquot->dq_dqb.u.v2_mdqb.dqb_off;
419
420	/* Check if there is inconsistancy. */
421	if (dq->dq_dqb.dqb_curspace != dquot->dq_dqb.dqb_curspace ||
422	    dq->dq_dqb.dqb_curinodes != dquot->dq_dqb.dqb_curinodes) {
423		scan_data->usage_is_inconsistent = 1;
424		fprintf(stderr, "[QUOTA WARNING] Usage inconsistent for ID %d:"
425			"actual (%llu, %llu) != expected (%llu, %llu)\n",
426			dq->dq_id, dq->dq_dqb.dqb_curspace,
427			dq->dq_dqb.dqb_curinodes, dquot->dq_dqb.dqb_curspace,
428			dquot->dq_dqb.dqb_curinodes);
429	}
430
431	if (scan_data->update_limits) {
432		dq->dq_dqb.dqb_ihardlimit = dquot->dq_dqb.dqb_ihardlimit;
433		dq->dq_dqb.dqb_isoftlimit = dquot->dq_dqb.dqb_isoftlimit;
434		dq->dq_dqb.dqb_bhardlimit = dquot->dq_dqb.dqb_bhardlimit;
435		dq->dq_dqb.dqb_bsoftlimit = dquot->dq_dqb.dqb_bsoftlimit;
436	}
437
438	if (scan_data->update_usage) {
439		dq->dq_dqb.dqb_curspace = dquot->dq_dqb.dqb_curspace;
440		dq->dq_dqb.dqb_curinodes = dquot->dq_dqb.dqb_curinodes;
441	}
442
443	return 0;
444}
445
446/*
447 * Read all dquots from quota file into memory
448 */
449static errcode_t quota_read_all_dquots(struct quota_handle *qh,
450                                       quota_ctx_t qctx, int update_limits)
451{
452	struct scan_dquots_data scan_data;
453
454	scan_data.quota_dict = qctx->quota_dict[qh->qh_type];
455	scan_data.update_limits = update_limits;
456	scan_data.update_usage = 0;
457
458	return qh->qh_ops->scan_dquots(qh, scan_dquots_callback, &scan_data);
459}
460
461/*
462 * Write all memory dquots into quota file
463 */
464static errcode_t quota_write_all_dquots(struct quota_handle *qh,
465                                        quota_ctx_t qctx)
466{
467	errcode_t err;
468
469	err = ext2fs_read_bitmaps(qctx->fs);
470	if (err)
471		return err;
472	write_dquots(qctx->quota_dict[qh->qh_type], qh);
473	ext2fs_mark_bb_dirty(qctx->fs);
474	qctx->fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
475	ext2fs_write_bitmaps(qctx->fs);
476	return 0;
477}
478
479/*
480 * Updates the in-memory quota limits from the given quota inode.
481 */
482errcode_t quota_update_limits(quota_ctx_t qctx, ext2_ino_t qf_ino, int type)
483{
484	struct quota_handle *qh;
485	errcode_t err;
486
487	if (!qctx)
488		return 0;
489
490	err = ext2fs_get_mem(sizeof(struct quota_handle), &qh);
491	if (err) {
492		log_err("Unable to allocate quota handle", "");
493		return err;
494	}
495
496	err = quota_file_open(qh, qctx->fs, qf_ino, type, -1, 0);
497	if (err) {
498		log_err("Open quota file failed", "");
499		goto out;
500	}
501
502	quota_read_all_dquots(qh, qctx, 1);
503
504	err = quota_file_close(qh);
505	if (err) {
506		log_err("Cannot finish IO on new quotafile: %s",
507			strerror(errno));
508		if (qh->qh_qf.e2_file)
509			ext2fs_file_close(qh->qh_qf.e2_file);
510	}
511out:
512	ext2fs_free_mem(&qh);
513	return err;
514}
515
516/*
517 * Compares the measured quota in qctx->quota_dict with that in the quota inode
518 * on disk and updates the limits in qctx->quota_dict. 'usage_inconsistent' is
519 * set to 1 if the supplied and on-disk quota usage values are not identical.
520 */
521errcode_t quota_compare_and_update(quota_ctx_t qctx, int qtype,
522				   int *usage_inconsistent)
523{
524	ext2_filsys fs = qctx->fs;
525	struct quota_handle qh;
526	struct scan_dquots_data scan_data;
527	ext2_ino_t qf_ino;
528	errcode_t err = 0;
529
530	if (!qctx->quota_dict[qtype])
531		goto out;
532
533	qf_ino = qtype == USRQUOTA ? fs->super->s_usr_quota_inum :
534				     fs->super->s_grp_quota_inum;
535	err = quota_file_open(&qh, fs, qf_ino, qtype, -1, 0);
536	if (err) {
537		log_err("Open quota file failed", "");
538		goto out;
539	}
540
541	scan_data.quota_dict = qctx->quota_dict[qtype];
542	scan_data.update_limits = 1;
543	scan_data.update_usage = 0;
544	scan_data.usage_is_inconsistent = 0;
545	err = qh.qh_ops->scan_dquots(&qh, scan_dquots_callback, &scan_data);
546	if (err) {
547		log_err("Error scanning dquots", "");
548		goto out;
549	}
550	*usage_inconsistent = scan_data.usage_is_inconsistent;
551
552out:
553	return err;
554}
555