1 /** quotaio.c
2 *
3 * Generic IO operations on quotafiles
4 * Jan Kara <jack@suse.cz> - sponsored by SuSE CR
5 * Aditya Kali <adityakali@google.com> - Ported to e2fsprogs
6 */
7
8 #include "config.h"
9 #include <stdio.h>
10 #include <errno.h>
11 #include <string.h>
12 #include <unistd.h>
13 #include <stdlib.h>
14 #include <time.h>
15 #include <sys/types.h>
16 #include <sys/stat.h>
17 #include <sys/file.h>
18 #include <assert.h>
19
20 #include "common.h"
21 #include "quotaio.h"
22
23 static const char * const extensions[MAXQUOTAS] = {
24 [USRQUOTA] = "user",
25 [GRPQUOTA] = "group",
26 [PRJQUOTA] = "project",
27 };
28 static const char * const basenames[] = {
29 "", /* undefined */
30 "quota", /* QFMT_VFS_OLD */
31 "aquota", /* QFMT_VFS_V0 */
32 "", /* QFMT_OCFS2 */
33 "aquota" /* QFMT_VFS_V1 */
34 };
35
36 /* Header in all newer quotafiles */
37 struct disk_dqheader {
38 __le32 dqh_magic;
39 __le32 dqh_version;
40 } __attribute__ ((packed));
41
42 /**
43 * Convert type of quota to written representation
44 */
quota_type2name(enum quota_type qtype)45 const char *quota_type2name(enum quota_type qtype)
46 {
47 if (qtype >= MAXQUOTAS)
48 return "unknown";
49 return extensions[qtype];
50 }
51
quota_type2inum(enum quota_type qtype,struct ext2_super_block * sb)52 ext2_ino_t quota_type2inum(enum quota_type qtype,
53 struct ext2_super_block *sb)
54 {
55 switch (qtype) {
56 case USRQUOTA:
57 return EXT4_USR_QUOTA_INO;
58 case GRPQUOTA:
59 return EXT4_GRP_QUOTA_INO;
60 case PRJQUOTA:
61 return sb->s_prj_quota_inum;
62 default:
63 return 0;
64 }
65 return 0;
66 }
67
68 /**
69 * Creates a quota file name for given type and format.
70 */
quota_get_qf_name(enum quota_type type,int fmt,char * buf)71 const char *quota_get_qf_name(enum quota_type type, int fmt, char *buf)
72 {
73 if (!buf)
74 return NULL;
75 snprintf(buf, QUOTA_NAME_LEN, "%s.%s",
76 basenames[fmt], extensions[type]);
77
78 return buf;
79 }
80
81 /*
82 * Set grace time if needed
83 */
update_grace_times(struct dquot * q)84 void update_grace_times(struct dquot *q)
85 {
86 time_t now;
87
88 time(&now);
89 if (q->dq_dqb.dqb_bsoftlimit && toqb(q->dq_dqb.dqb_curspace) >
90 q->dq_dqb.dqb_bsoftlimit) {
91 if (!q->dq_dqb.dqb_btime)
92 q->dq_dqb.dqb_btime =
93 now + q->dq_h->qh_info.dqi_bgrace;
94 } else {
95 q->dq_dqb.dqb_btime = 0;
96 }
97
98 if (q->dq_dqb.dqb_isoftlimit && q->dq_dqb.dqb_curinodes >
99 q->dq_dqb.dqb_isoftlimit) {
100 if (!q->dq_dqb.dqb_itime)
101 q->dq_dqb.dqb_itime =
102 now + q->dq_h->qh_info.dqi_igrace;
103 } else {
104 q->dq_dqb.dqb_itime = 0;
105 }
106 }
107
quota_inode_truncate(ext2_filsys fs,ext2_ino_t ino)108 errcode_t quota_inode_truncate(ext2_filsys fs, ext2_ino_t ino)
109 {
110 struct ext2_inode inode;
111 errcode_t err;
112 enum quota_type qtype;
113
114 if ((err = ext2fs_read_inode(fs, ino, &inode)))
115 return err;
116
117 for (qtype = 0; qtype < MAXQUOTAS; qtype++)
118 if (ino == quota_type2inum(qtype, fs->super))
119 break;
120
121 if (qtype != MAXQUOTAS) {
122 inode.i_dtime = fs->now ? fs->now : time(0);
123 if (!ext2fs_inode_has_valid_blocks2(fs, &inode))
124 return 0;
125 err = ext2fs_punch(fs, ino, &inode, NULL, 0, ~0ULL);
126 if (err)
127 return err;
128 fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
129 memset(&inode, 0, sizeof(struct ext2_inode));
130 } else {
131 inode.i_flags &= ~EXT2_IMMUTABLE_FL;
132 }
133 err = ext2fs_write_inode(fs, ino, &inode);
134 return err;
135 }
136
137 /* Functions to read/write quota file. */
quota_write_nomount(struct quota_file * qf,ext2_loff_t offset,void * buf,unsigned int size)138 static unsigned int quota_write_nomount(struct quota_file *qf,
139 ext2_loff_t offset,
140 void *buf, unsigned int size)
141 {
142 ext2_file_t e2_file = qf->e2_file;
143 unsigned int bytes_written = 0;
144 errcode_t err;
145
146 err = ext2fs_file_llseek(e2_file, offset, EXT2_SEEK_SET, NULL);
147 if (err) {
148 log_err("ext2fs_file_llseek failed: %ld", err);
149 return 0;
150 }
151
152 err = ext2fs_file_write(e2_file, buf, size, &bytes_written);
153 if (err) {
154 log_err("ext2fs_file_write failed: %ld", err);
155 return 0;
156 }
157
158 /* Correct inode.i_size is set in end_io. */
159 return bytes_written;
160 }
161
quota_read_nomount(struct quota_file * qf,ext2_loff_t offset,void * buf,unsigned int size)162 static unsigned int quota_read_nomount(struct quota_file *qf,
163 ext2_loff_t offset,
164 void *buf, unsigned int size)
165 {
166 ext2_file_t e2_file = qf->e2_file;
167 unsigned int bytes_read = 0;
168 errcode_t err;
169
170 err = ext2fs_file_llseek(e2_file, offset, EXT2_SEEK_SET, NULL);
171 if (err) {
172 log_err("ext2fs_file_llseek failed: %ld", err);
173 return 0;
174 }
175
176 err = ext2fs_file_read(e2_file, buf, size, &bytes_read);
177 if (err) {
178 log_err("ext2fs_file_read failed: %ld", err);
179 return 0;
180 }
181
182 return bytes_read;
183 }
184
185 /*
186 * Detect quota format and initialize quota IO
187 */
quota_file_open(quota_ctx_t qctx,struct quota_handle * h,ext2_ino_t qf_ino,enum quota_type qtype,int fmt,int flags)188 errcode_t quota_file_open(quota_ctx_t qctx, struct quota_handle *h,
189 ext2_ino_t qf_ino, enum quota_type qtype,
190 int fmt, int flags)
191 {
192 ext2_filsys fs = qctx->fs;
193 ext2_file_t e2_file;
194 errcode_t err;
195 int allocated_handle = 0;
196
197 if (qtype >= MAXQUOTAS)
198 return EINVAL;
199
200 if (fmt == -1)
201 fmt = QFMT_VFS_V1;
202
203 err = ext2fs_read_bitmaps(fs);
204 if (err)
205 return err;
206
207 if (qf_ino == 0)
208 qf_ino = *quota_sb_inump(fs->super, qtype);
209
210 log_debug("Opening quota ino=%u, type=%d", qf_ino, qtype);
211 err = ext2fs_file_open(fs, qf_ino, flags, &e2_file);
212 if (err) {
213 log_err("ext2fs_file_open failed: %s", error_message(err));
214 return err;
215 }
216
217 if (!h) {
218 if (qctx->quota_file[qtype]) {
219 h = qctx->quota_file[qtype];
220 if (((flags & EXT2_FILE_WRITE) == 0) ||
221 (h->qh_file_flags & EXT2_FILE_WRITE)) {
222 ext2fs_file_close(e2_file);
223 return 0;
224 }
225 (void) quota_file_close(qctx, h);
226 }
227 err = ext2fs_get_mem(sizeof(struct quota_handle), &h);
228 if (err) {
229 log_err("Unable to allocate quota handle");
230 ext2fs_file_close(e2_file);
231 return err;
232 }
233 allocated_handle = 1;
234 }
235
236 h->qh_qf.e2_file = e2_file;
237 h->qh_qf.fs = fs;
238 h->qh_qf.ino = qf_ino;
239 h->e2fs_write = quota_write_nomount;
240 h->e2fs_read = quota_read_nomount;
241 h->qh_file_flags = flags;
242 h->qh_io_flags = 0;
243 h->qh_type = qtype;
244 h->qh_fmt = fmt;
245 memset(&h->qh_info, 0, sizeof(h->qh_info));
246 h->qh_ops = "afile_ops_2;
247
248 if (h->qh_ops->check_file &&
249 (h->qh_ops->check_file(h, qtype, fmt) == 0)) {
250 log_err("qh_ops->check_file failed");
251 err = EIO;
252 goto errout;
253 }
254
255 if (h->qh_ops->init_io && (h->qh_ops->init_io(h) < 0)) {
256 log_err("qh_ops->init_io failed");
257 err = EIO;
258 goto errout;
259 }
260 if (allocated_handle)
261 qctx->quota_file[qtype] = h;
262
263 return 0;
264 errout:
265 ext2fs_file_close(e2_file);
266 if (allocated_handle)
267 ext2fs_free_mem(&h);
268 return err;
269 }
270
quota_inode_init_new(ext2_filsys fs,ext2_ino_t ino)271 static errcode_t quota_inode_init_new(ext2_filsys fs, ext2_ino_t ino)
272 {
273 struct ext2_inode inode;
274 errcode_t err = 0;
275
276 err = ext2fs_read_inode(fs, ino, &inode);
277 if (err) {
278 log_err("ex2fs_read_inode failed");
279 return err;
280 }
281
282 if (EXT2_I_SIZE(&inode)) {
283 err = quota_inode_truncate(fs, ino);
284 if (err)
285 return err;
286 }
287
288 memset(&inode, 0, sizeof(struct ext2_inode));
289 ext2fs_iblk_set(fs, &inode, 0);
290 inode.i_atime = inode.i_mtime =
291 inode.i_ctime = fs->now ? fs->now : time(0);
292 inode.i_links_count = 1;
293 inode.i_mode = LINUX_S_IFREG | 0600;
294 inode.i_flags |= EXT2_IMMUTABLE_FL;
295 if (ext2fs_has_feature_extents(fs->super))
296 inode.i_flags |= EXT4_EXTENTS_FL;
297
298 err = ext2fs_write_new_inode(fs, ino, &inode);
299 if (err) {
300 log_err("ext2fs_write_new_inode failed: %ld", err);
301 return err;
302 }
303 return err;
304 }
305
306 /*
307 * Create new quotafile of specified format on given filesystem
308 */
quota_file_create(struct quota_handle * h,ext2_filsys fs,enum quota_type qtype,int fmt)309 errcode_t quota_file_create(struct quota_handle *h, ext2_filsys fs,
310 enum quota_type qtype, int fmt)
311 {
312 ext2_file_t e2_file;
313 errcode_t err;
314 ext2_ino_t qf_inum = 0;
315
316 if (fmt == -1)
317 fmt = QFMT_VFS_V1;
318
319 h->qh_qf.fs = fs;
320 qf_inum = quota_type2inum(qtype, fs->super);
321 if (qf_inum == 0 && qtype == PRJQUOTA) {
322 err = ext2fs_new_inode(fs, EXT2_ROOT_INO, LINUX_S_IFREG | 0600,
323 0, &qf_inum);
324 if (err)
325 return err;
326 ext2fs_inode_alloc_stats2(fs, qf_inum, +1, 0);
327 ext2fs_mark_ib_dirty(fs);
328 } else if (qf_inum == 0) {
329 return EXT2_ET_BAD_INODE_NUM;
330 }
331
332 err = ext2fs_read_bitmaps(fs);
333 if (err)
334 goto out_err;
335
336 err = quota_inode_init_new(fs, qf_inum);
337 if (err) {
338 log_err("init_new_quota_inode failed");
339 goto out_err;
340 }
341 h->qh_qf.ino = qf_inum;
342 h->qh_file_flags = EXT2_FILE_WRITE | EXT2_FILE_CREATE;
343 h->e2fs_write = quota_write_nomount;
344 h->e2fs_read = quota_read_nomount;
345
346 log_debug("Creating quota ino=%u, type=%d", qf_inum, qtype);
347 err = ext2fs_file_open(fs, qf_inum, h->qh_file_flags, &e2_file);
348 if (err) {
349 log_err("ext2fs_file_open failed: %ld", err);
350 goto out_err;
351 }
352 h->qh_qf.e2_file = e2_file;
353
354 h->qh_io_flags = 0;
355 h->qh_type = qtype;
356 h->qh_fmt = fmt;
357 memset(&h->qh_info, 0, sizeof(h->qh_info));
358 h->qh_ops = "afile_ops_2;
359
360 if (h->qh_ops->new_io && (h->qh_ops->new_io(h) < 0)) {
361 log_err("qh_ops->new_io failed");
362 err = EIO;
363 goto out_err1;
364 }
365
366 return 0;
367
368 out_err1:
369 ext2fs_file_close(e2_file);
370 out_err:
371
372 if (qf_inum)
373 quota_inode_truncate(fs, qf_inum);
374
375 return err;
376 }
377
378 /*
379 * Close quotafile and release handle
380 */
quota_file_close(quota_ctx_t qctx,struct quota_handle * h)381 errcode_t quota_file_close(quota_ctx_t qctx, struct quota_handle *h)
382 {
383 if (h->qh_io_flags & IOFL_INFODIRTY) {
384 if (h->qh_ops->write_info && h->qh_ops->write_info(h) < 0)
385 return EIO;
386 h->qh_io_flags &= ~IOFL_INFODIRTY;
387 }
388
389 if (h->qh_ops->end_io && h->qh_ops->end_io(h) < 0)
390 return EIO;
391 if (h->qh_qf.e2_file)
392 ext2fs_file_close(h->qh_qf.e2_file);
393 if (qctx->quota_file[h->qh_type] == h)
394 ext2fs_free_mem(&qctx->quota_file[h->qh_type]);
395 return 0;
396 }
397
398 /*
399 * Create empty quota structure
400 */
get_empty_dquot(void)401 struct dquot *get_empty_dquot(void)
402 {
403 struct dquot *dquot;
404
405 if (ext2fs_get_memzero(sizeof(struct dquot), &dquot)) {
406 log_err("Failed to allocate dquot");
407 return NULL;
408 }
409
410 dquot->dq_id = -1;
411 return dquot;
412 }
413