mkquota.c revision edbfd75d8fb4a13eccc2cadb12a453c3425d17d1 
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 is_quota_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 || fmt > QFMT_VFS_V1)
75		return -EINVAL;
76
77	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 set_sb_quota_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 remove_quota_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	set_sb_quota_inum(fs, 0, qtype);
111	/* Truncate the inode only if its a reserved one. */
112	if (qf_ino < EXT2_FIRST_INODE(fs->super))
113		truncate_quota_inode(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, COMMIT_ALL);
131		}
132	}
133}
134
135errcode_t write_quota_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	h = smalloc(sizeof(struct quota_handle));
148	ext2fs_read_bitmaps(fs);
149
150	for (i = 0; i < MAXQUOTAS; i++) {
151		if ((qtype != -1) && (i != qtype))
152			continue;
153
154		dict = qctx->quota_dict[i];
155		if (!dict)
156			continue;
157
158		retval = new_io(h, fs, i, fmt);
159		if (retval < 0) {
160			log_err("Cannot initialize io on quotafile", "");
161			continue;
162		}
163
164		write_dquots(dict, h);
165		retval = end_io(h);
166		if (retval < 0) {
167			log_err("Cannot finish IO on new quotafile: %s",
168				strerror(errno));
169			if (h->qh_qf.e2_file)
170				ext2fs_file_close(h->qh_qf.e2_file);
171			truncate_quota_inode(fs, h->qh_qf.ino);
172			continue;
173		}
174
175		/* Set quota inode numbers in superblock. */
176		set_sb_quota_inum(fs, h->qh_qf.ino, i);
177		ext2fs_mark_super_dirty(fs);
178		ext2fs_mark_bb_dirty(fs);
179		fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
180	}
181
182	ext2fs_write_bitmaps(fs);
183	free(h);
184	return retval;
185}
186
187/******************************************************************/
188/* Helper functions for computing quota in memory.                */
189/******************************************************************/
190
191static int dict_uint_cmp(const void *a, const void *b)
192{
193	unsigned int	c, d;
194
195	c = VOIDPTR_TO_UINT(a);
196	d = VOIDPTR_TO_UINT(b);
197
198	return c - d;
199}
200
201static qid_t get_qid(struct ext2_inode *inode, int qtype)
202{
203	switch (qtype) {
204	case USRQUOTA:
205		return inode_uid(*inode);
206	case GRPQUOTA:
207		return inode_gid(*inode);
208	default:
209		log_err("Invalid quota type: %d", qtype);
210		BUG_ON(1);
211	}
212}
213
214static void quota_dnode_free(dnode_t *node,
215			     void *context EXT2FS_ATTR((unused)))
216{
217	void *ptr = node ? dnode_get(node) : 0;
218
219	free(ptr);
220	free(node);
221}
222
223/*
224 * Called in Pass #1 to set up the quota tracking data structures.
225 */
226void init_quota_context(quota_ctx_t *qctx, ext2_filsys fs, int qtype)
227{
228	int	i;
229	dict_t	*dict;
230	quota_ctx_t ctx;
231
232	ctx = (quota_ctx_t)smalloc(sizeof(struct quota_ctx));
233	memset(ctx, 0, sizeof(struct quota_ctx));
234	for (i = 0; i < MAXQUOTAS; i++) {
235		if ((qtype != -1) && (i != qtype))
236			continue;
237		dict = (dict_t *)smalloc(sizeof(dict_t));
238		ctx->quota_dict[i] = dict;
239		dict_init(dict, DICTCOUNT_T_MAX, dict_uint_cmp);
240		dict_set_allocator(dict, NULL, quota_dnode_free, NULL);
241	}
242
243	ctx->fs = fs;
244	*qctx = ctx;
245}
246
247void release_quota_context(quota_ctx_t *qctx)
248{
249	dict_t	*dict;
250	int	i;
251	quota_ctx_t ctx;
252
253	if (!qctx)
254		return;
255
256	ctx = *qctx;
257	for (i = 0; i < MAXQUOTAS; i++) {
258		dict = ctx->quota_dict[i];
259		ctx->quota_dict[i] = 0;
260		if (dict) {
261			dict_free_nodes(dict);
262			free(dict);
263		}
264	}
265	*qctx = NULL;
266	free(ctx);
267}
268
269static struct dquot *get_dq(dict_t *dict, __u32 key)
270{
271	struct dquot	*dq;
272	dnode_t		*n;
273
274	n = dict_lookup(dict, UINT_TO_VOIDPTR(key));
275	if (n)
276		dq = dnode_get(n);
277	else {
278		dq = smalloc(sizeof(struct dquot));
279		memset(dq, 0, sizeof(struct dquot));
280		dict_alloc_insert(dict, UINT_TO_VOIDPTR(key), dq);
281	}
282	return dq;
283}
284
285
286/*
287 * Called to update the blocks used by a particular inode
288 */
289void quota_data_add(quota_ctx_t qctx, struct ext2_inode *inode, ext2_ino_t ino,
290		    qsize_t space)
291{
292	struct dquot	*dq;
293	dict_t		*dict;
294	int		i;
295
296	if (!qctx)
297		return;
298
299	log_debug("ADD_DATA: Inode: %u, UID/GID: %u/%u, space: %ld", ino,
300			inode_uid(*inode),
301			inode_gid(*inode), space);
302	for (i = 0; i < MAXQUOTAS; i++) {
303		dict = qctx->quota_dict[i];
304		if (dict) {
305			dq = get_dq(dict, get_qid(inode, i));
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 compute_quota(quota_ctx_t qctx, int qtype)
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			/* Convert i_blocks to # of 1k blocks */
391			space = (ext2fs_inode_i_blocks(fs, &inode) + 1) >> 1;
392			quota_data_add(qctx, &inode, ino, space);
393			quota_data_inodes(qctx, &inode, ino, +1);
394		}
395	}
396
397	ext2fs_close_inode_scan(scan);
398
399	return 0;
400}
401