mkquota.c revision 7bed9a78828e56ddb687cf2b5f1d6ec1f5e5ecc6 
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#ifdef HAVE_SYS_QUOTA_H
10#include <sys/quota.h>
11#endif
12#include <unistd.h>
13#include <errno.h>
14#include <string.h>
15#include <fcntl.h>
16
17#include "ext2fs/ext2_fs.h"
18#include "ext2fs/ext2fs.h"
19#include "e2p/e2p.h"
20
21#include "quota.h"
22#include "quotaio.h"
23#include "quotaio_v2.h"
24#include "quotaio_tree.h"
25#include "mkquota.h"
26#include "common.h"
27
28/* Needed for architectures where sizeof(int) != sizeof(void *) */
29#define UINT_TO_VOIDPTR(val)  ((void *)(intptr_t)(val))
30#define VOIDPTR_TO_UINT(ptr)  ((unsigned int)(intptr_t)(ptr))
31
32static void print_inode(struct ext2_inode *inode)
33{
34	if (!inode)
35		return;
36
37	fprintf(stderr, "  i_mode = %d\n", inode->i_mode);
38	fprintf(stderr, "  i_uid = %d\n", inode->i_uid);
39	fprintf(stderr, "  i_size = %d\n", inode->i_size);
40	fprintf(stderr, "  i_atime = %d\n", inode->i_atime);
41	fprintf(stderr, "  i_ctime = %d\n", inode->i_ctime);
42	fprintf(stderr, "  i_mtime = %d\n", inode->i_mtime);
43	fprintf(stderr, "  i_dtime = %d\n", inode->i_dtime);
44	fprintf(stderr, "  i_gid = %d\n", inode->i_gid);
45	fprintf(stderr, "  i_links_count = %d\n", inode->i_links_count);
46	fprintf(stderr, "  i_blocks = %d\n", inode->i_blocks);
47	fprintf(stderr, "  i_flags = %d\n", inode->i_flags);
48
49	return;
50}
51
52int quota_is_on(ext2_filsys fs, int type)
53{
54	char tmp[1024];
55	qid_t id = (type == USRQUOTA) ? getuid() : getgid();
56
57#ifdef HAVE_QUOTACTL
58	if (!quotactl(QCMD(Q_V2_GETQUOTA, type), fs->device_name, id, tmp))
59		return 1;
60#endif
61	return 0;
62}
63
64/*
65 * Returns 0 if not able to find the quota file, otherwise returns its
66 * inode number.
67 */
68int quota_file_exists(ext2_filsys fs, int qtype, int fmt)
69{
70	char qf_name[256];
71	errcode_t ret;
72	ext2_ino_t ino;
73
74	if (qtype >= MAXQUOTAS)
75		return -EINVAL;
76
77	quota_get_qf_name(qtype, fmt, qf_name);
78
79	ret = ext2fs_lookup(fs, EXT2_ROOT_INO, qf_name, strlen(qf_name), 0,
80			    &ino);
81	if (ret)
82		return 0;
83
84	return ino;
85}
86
87/*
88 * Set the value for reserved quota inode number field in superblock.
89 */
90void quota_set_sb_inum(ext2_filsys fs, ext2_ino_t ino, int qtype)
91{
92	ext2_ino_t *inump;
93
94	inump = (qtype == USRQUOTA) ? &fs->super->s_usr_quota_inum :
95		&fs->super->s_grp_quota_inum;
96
97	log_debug("setting quota ino in superblock: ino=%u, type=%d", ino,
98		 qtype);
99	*inump = ino;
100	ext2fs_mark_super_dirty(fs);
101}
102
103errcode_t quota_remove_inode(ext2_filsys fs, int qtype)
104{
105	ext2_ino_t qf_ino;
106
107	ext2fs_read_bitmaps(fs);
108	qf_ino = (qtype == USRQUOTA) ? fs->super->s_usr_quota_inum :
109		fs->super->s_grp_quota_inum;
110	quota_set_sb_inum(fs, 0, qtype);
111	/* Truncate the inode only if its a reserved one. */
112	if (qf_ino < EXT2_FIRST_INODE(fs->super))
113		quota_inode_truncate(fs, qf_ino);
114
115	ext2fs_mark_super_dirty(fs);
116	ext2fs_write_bitmaps(fs);
117	return 0;
118}
119
120static void write_dquots(dict_t *dict, struct quota_handle *qh)
121{
122	dnode_t		*n;
123	struct dquot	*dq;
124
125	for (n = dict_first(dict); n; n = dict_next(dict, n)) {
126		dq = dnode_get(n);
127		if (dq) {
128			dq->dq_h = qh;
129			update_grace_times(dq);
130			qh->qh_ops->commit_dquot(dq);
131		}
132	}
133}
134
135errcode_t quota_write_inode(quota_ctx_t qctx, int qtype)
136{
137	int		retval = 0, i;
138	dict_t		*dict;
139	ext2_filsys	fs;
140	struct quota_handle *h;
141	int		fmt = QFMT_VFS_V1;
142
143	if (!qctx)
144		return 0;
145
146	fs = qctx->fs;
147	retval = ext2fs_get_mem(sizeof(struct quota_handle), &h);
148	if (retval) {
149		log_err("Unable to allocate quota handle", "");
150		goto out;
151	}
152
153	ext2fs_read_bitmaps(fs);
154
155	for (i = 0; i < MAXQUOTAS; i++) {
156		if ((qtype != -1) && (i != qtype))
157			continue;
158
159		dict = qctx->quota_dict[i];
160		if (!dict)
161			continue;
162
163		retval = quota_file_create(h, fs, i, fmt);
164		if (retval < 0) {
165			log_err("Cannot initialize io on quotafile", "");
166			continue;
167		}
168
169		write_dquots(dict, h);
170		retval = quota_file_close(h);
171		if (retval < 0) {
172			log_err("Cannot finish IO on new quotafile: %s",
173				strerror(errno));
174			if (h->qh_qf.e2_file)
175				ext2fs_file_close(h->qh_qf.e2_file);
176			quota_inode_truncate(fs, h->qh_qf.ino);
177			continue;
178		}
179
180		/* Set quota inode numbers in superblock. */
181		quota_set_sb_inum(fs, h->qh_qf.ino, i);
182		ext2fs_mark_super_dirty(fs);
183		ext2fs_mark_bb_dirty(fs);
184		fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
185	}
186
187	ext2fs_write_bitmaps(fs);
188out:
189	if (h)
190		ext2fs_free_mem(&h);
191	return retval;
192}
193
194/******************************************************************/
195/* Helper functions for computing quota in memory.                */
196/******************************************************************/
197
198static int dict_uint_cmp(const void *a, const void *b)
199{
200	unsigned int	c, d;
201
202	c = VOIDPTR_TO_UINT(a);
203	d = VOIDPTR_TO_UINT(b);
204
205	return c - d;
206}
207
208static inline qid_t get_qid(struct ext2_inode *inode, int qtype)
209{
210	if (qtype == USRQUOTA)
211		return inode_uid(*inode);
212	return inode_gid(*inode);
213}
214
215static void quota_dnode_free(dnode_t *node,
216			     void *context EXT2FS_ATTR((unused)))
217{
218	void *ptr = node ? dnode_get(node) : 0;
219
220	ext2fs_free_mem(&ptr);
221	free(node);
222}
223
224/*
225 * Set up the quota tracking data structures.
226 */
227errcode_t quota_init_context(quota_ctx_t *qctx, ext2_filsys fs, int qtype)
228{
229	int	i, err = 0;
230	dict_t	*dict;
231	quota_ctx_t ctx;
232
233	err = ext2fs_get_mem(sizeof(struct quota_ctx), &ctx);
234	if (err) {
235		log_err("Failed to allocate quota context", "");
236		return err;
237	}
238
239	memset(ctx, 0, sizeof(struct quota_ctx));
240	for (i = 0; i < MAXQUOTAS; i++) {
241		if ((qtype != -1) && (i != qtype))
242			continue;
243		err = ext2fs_get_mem(sizeof(dict_t), &dict);
244		if (err) {
245			log_err("Failed to allocate dictionary", "");
246			return err;
247		}
248		ctx->quota_dict[i] = dict;
249		dict_init(dict, DICTCOUNT_T_MAX, dict_uint_cmp);
250		dict_set_allocator(dict, NULL, quota_dnode_free, NULL);
251	}
252
253	ctx->fs = fs;
254	*qctx = ctx;
255	return 0;
256}
257
258void quota_release_context(quota_ctx_t *qctx)
259{
260	dict_t	*dict;
261	int	i;
262	quota_ctx_t ctx;
263
264	if (!qctx)
265		return;
266
267	ctx = *qctx;
268	for (i = 0; i < MAXQUOTAS; i++) {
269		dict = ctx->quota_dict[i];
270		ctx->quota_dict[i] = 0;
271		if (dict) {
272			dict_free_nodes(dict);
273			free(dict);
274		}
275	}
276	*qctx = NULL;
277	free(ctx);
278}
279
280static struct dquot *get_dq(dict_t *dict, __u32 key)
281{
282	struct dquot	*dq;
283	dnode_t		*n;
284
285	n = dict_lookup(dict, UINT_TO_VOIDPTR(key));
286	if (n)
287		dq = dnode_get(n);
288	else {
289		if (ext2fs_get_mem(sizeof(struct dquot), &dq)) {
290			log_err("Unable to allocate dquot", "");
291			return NULL;
292		}
293		memset(dq, 0, sizeof(struct dquot));
294		dict_alloc_insert(dict, UINT_TO_VOIDPTR(key), dq);
295	}
296	return dq;
297}
298
299
300/*
301 * Called to update the blocks used by a particular inode
302 */
303void quota_data_add(quota_ctx_t qctx, struct ext2_inode *inode, ext2_ino_t ino,
304		    qsize_t space)
305{
306	struct dquot	*dq;
307	dict_t		*dict;
308	int		i;
309
310	if (!qctx)
311		return;
312
313	log_debug("ADD_DATA: Inode: %u, UID/GID: %u/%u, space: %ld", ino,
314			inode_uid(*inode),
315			inode_gid(*inode), space);
316	for (i = 0; i < MAXQUOTAS; i++) {
317		dict = qctx->quota_dict[i];
318		if (dict) {
319			dq = get_dq(dict, get_qid(inode, i));
320			if (dq)
321				dq->dq_dqb.dqb_curspace += space;
322		}
323	}
324}
325
326/*
327 * Called to remove some blocks used by a particular inode
328 */
329void quota_data_sub(quota_ctx_t qctx, struct ext2_inode *inode, ext2_ino_t ino,
330		    qsize_t space)
331{
332	struct dquot	*dq;
333	dict_t		*dict;
334	int		i;
335
336	if (!qctx)
337		return;
338
339	log_debug("SUB_DATA: Inode: %u, UID/GID: %u/%u, space: %ld", ino,
340			inode_uid(*inode),
341			inode_gid(*inode), space);
342	for (i = 0; i < MAXQUOTAS; i++) {
343		dict = qctx->quota_dict[i];
344		if (dict) {
345			dq = get_dq(dict, get_qid(inode, i));
346			dq->dq_dqb.dqb_curspace -= space;
347		}
348	}
349}
350
351/*
352 * Called to count the files used by an inode's user/group
353 */
354void quota_data_inodes(quota_ctx_t qctx, struct ext2_inode *inode,
355		       ext2_ino_t ino, int adjust)
356{
357	struct dquot	*dq;
358	dict_t		*dict;
359	int		i;
360
361	if (!qctx)
362		return;
363
364	log_debug("ADJ_INODE: Inode: %u, UID/GID: %u/%u, adjust: %d", ino,
365			inode_uid(*inode),
366			inode_gid(*inode), adjust);
367	for (i = 0; i < MAXQUOTAS; i++) {
368		dict = qctx->quota_dict[i];
369		if (dict) {
370			dq = get_dq(dict, get_qid(inode, i));
371			dq->dq_dqb.dqb_curinodes += adjust;
372		}
373	}
374}
375
376errcode_t quota_compute_usage(quota_ctx_t qctx)
377{
378	ext2_filsys fs;
379	ext2_ino_t ino;
380	errcode_t ret;
381	struct ext2_inode inode;
382	qsize_t space;
383	ext2_inode_scan scan;
384
385	if (!qctx)
386		return 0;
387
388	fs = qctx->fs;
389	ret = ext2fs_open_inode_scan(fs, 0, &scan);
390	if (ret) {
391		log_err("while opening inode scan. ret=%ld", ret);
392		return ret;
393	}
394
395	while (1) {
396		ret = ext2fs_get_next_inode(scan, &ino, &inode);
397		if (ret) {
398			log_err("while getting next inode. ret=%ld", ret);
399			ext2fs_close_inode_scan(scan);
400			return ret;
401		}
402		if (ino == 0)
403			break;
404		if (inode.i_links_count) {
405			space = ext2fs_inode_i_blocks(fs, &inode) << 9;
406			quota_data_add(qctx, &inode, ino, space);
407			quota_data_inodes(qctx, &inode, ino, +1);
408		}
409	}
410
411	ext2fs_close_inode_scan(scan);
412
413	return 0;
414}
415
416struct scan_dquots_data {
417	quota_ctx_t         qctx;
418	int                 limit_only; /* read limit only */
419};
420
421static int scan_dquots_callback(struct dquot *dquot, void *cb_data)
422{
423	struct scan_dquots_data *scan_data =
424		(struct scan_dquots_data *)cb_data;
425	quota_ctx_t qctx = scan_data->qctx;
426	struct dquot *dq;
427
428	dq = get_dq(qctx->quota_dict[dquot->dq_h->qh_type], dquot->dq_id);
429
430	dq->dq_id = dquot->dq_id;
431	if (scan_data->limit_only) {
432		dq->dq_dqb.u.v2_mdqb.dqb_off = dquot->dq_dqb.u.v2_mdqb.dqb_off;
433		dq->dq_dqb.dqb_ihardlimit = dquot->dq_dqb.dqb_ihardlimit;
434		dq->dq_dqb.dqb_isoftlimit = dquot->dq_dqb.dqb_isoftlimit;
435		dq->dq_dqb.dqb_bhardlimit = dquot->dq_dqb.dqb_bhardlimit;
436		dq->dq_dqb.dqb_bsoftlimit = dquot->dq_dqb.dqb_bsoftlimit;
437	} else {
438		dq->dq_dqb = dquot->dq_dqb;
439	}
440	return 0;
441}
442
443/*
444 * Read all dquots from quota file into memory
445 */
446static errcode_t quota_read_all_dquots(struct quota_handle *qh,
447                                       quota_ctx_t qctx, int limit_only)
448{
449	struct scan_dquots_data scan_data;
450
451	scan_data.qctx = qctx;
452	scan_data.limit_only = limit_only;
453
454	return qh->qh_ops->scan_dquots(qh, scan_dquots_callback, &scan_data);
455}
456
457/*
458 * Write all memory dquots into quota file
459 */
460static errcode_t quota_write_all_dquots(struct quota_handle *qh,
461                                        quota_ctx_t qctx)
462{
463	errcode_t err;
464
465	err = ext2fs_read_bitmaps(qctx->fs);
466	if (err)
467		return err;
468	write_dquots(qctx->quota_dict[qh->qh_type], qh);
469	ext2fs_mark_bb_dirty(qctx->fs);
470	qctx->fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
471	ext2fs_write_bitmaps(qctx->fs);
472	return 0;
473}
474
475/*
476 * Update usage of in quota file, limits keep unchaged
477 */
478errcode_t quota_update_inode(quota_ctx_t qctx, ext2_ino_t qf_ino, int type)
479{
480	struct quota_handle *qh;
481	errcode_t err;
482
483	if (!qctx)
484		return 0;
485
486	err = ext2fs_get_mem(sizeof(struct quota_handle), &qh);
487	if (err) {
488		log_err("Unable to allocate quota handle", "");
489		return err;
490	}
491
492	err = quota_file_open(qh, qctx->fs, qf_ino, type, -1, EXT2_FILE_WRITE);
493	if (err) {
494		log_err("Open quota file failed", "");
495		goto out;
496	}
497
498	quota_read_all_dquots(qh, qctx, 1);
499	quota_write_all_dquots(qh, qctx);
500
501	err = quota_file_close(qh);
502	if (err) {
503		log_err("Cannot finish IO on new quotafile: %s",
504			strerror(errno));
505		if (qh->qh_qf.e2_file)
506			ext2fs_file_close(qh->qh_qf.e2_file);
507	}
508out:
509	ext2fs_free_mem(&qh);
510	return err;
511}
512