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1 | /* |
2 | * linux/fs/ufs/ialloc.c |
3 | * |
4 | * Copyright (c) 1998 |
5 | * Daniel Pirkl <daniel.pirkl@email.cz> |
6 | * Charles University, Faculty of Mathematics and Physics |
7 | * |
8 | * from |
9 | * |
10 | * linux/fs/ext2/ialloc.c |
11 | * |
12 | * Copyright (C) 1992, 1993, 1994, 1995 |
13 | * Remy Card (card@masi.ibp.fr) |
14 | * Laboratoire MASI - Institut Blaise Pascal |
15 | * Universite Pierre et Marie Curie (Paris VI) |
16 | * |
17 | * BSD ufs-inspired inode and directory allocation by |
18 | * Stephen Tweedie (sct@dcs.ed.ac.uk), 1993 |
19 | * Big-endian to little-endian byte-swapping/bitmaps by |
20 | * David S. Miller (davem@caip.rutgers.edu), 1995 |
21 | * |
22 | * UFS2 write support added by |
23 | * Evgeniy Dushistov <dushistov@mail.ru>, 2007 |
24 | */ |
25 | |
26 | #include <linux/fs.h> |
27 | #include <linux/time.h> |
28 | #include <linux/stat.h> |
29 | #include <linux/string.h> |
30 | #include <linux/quotaops.h> |
31 | #include <linux/buffer_head.h> |
32 | #include <linux/sched.h> |
33 | #include <linux/bitops.h> |
34 | #include <asm/byteorder.h> |
35 | |
36 | #include "ufs_fs.h" |
37 | #include "ufs.h" |
38 | #include "swab.h" |
39 | #include "util.h" |
40 | |
41 | /* |
42 | * NOTE! When we get the inode, we're the only people |
43 | * that have access to it, and as such there are no |
44 | * race conditions we have to worry about. The inode |
45 | * is not on the hash-lists, and it cannot be reached |
46 | * through the filesystem because the directory entry |
47 | * has been deleted earlier. |
48 | * |
49 | * HOWEVER: we must make sure that we get no aliases, |
50 | * which means that we have to call "clear_inode()" |
51 | * _before_ we mark the inode not in use in the inode |
52 | * bitmaps. Otherwise a newly created file might use |
53 | * the same inode number (not actually the same pointer |
54 | * though), and then we'd have two inodes sharing the |
55 | * same inode number and space on the harddisk. |
56 | */ |
57 | void ufs_free_inode (struct inode * inode) |
58 | { |
59 | struct super_block * sb; |
60 | struct ufs_sb_private_info * uspi; |
61 | struct ufs_super_block_first * usb1; |
62 | struct ufs_cg_private_info * ucpi; |
63 | struct ufs_cylinder_group * ucg; |
64 | int is_directory; |
65 | unsigned ino, cg, bit; |
66 | |
67 | UFSD("ENTER, ino %lu\n", inode->i_ino); |
68 | |
69 | sb = inode->i_sb; |
70 | uspi = UFS_SB(sb)->s_uspi; |
71 | usb1 = ubh_get_usb_first(uspi); |
72 | |
73 | ino = inode->i_ino; |
74 | |
75 | lock_super (sb); |
76 | |
77 | if (!((ino > 1) && (ino < (uspi->s_ncg * uspi->s_ipg )))) { |
78 | ufs_warning(sb, "ufs_free_inode", "reserved inode or nonexistent inode %u\n", ino); |
79 | unlock_super (sb); |
80 | return; |
81 | } |
82 | |
83 | cg = ufs_inotocg (ino); |
84 | bit = ufs_inotocgoff (ino); |
85 | ucpi = ufs_load_cylinder (sb, cg); |
86 | if (!ucpi) { |
87 | unlock_super (sb); |
88 | return; |
89 | } |
90 | ucg = ubh_get_ucg(UCPI_UBH(ucpi)); |
91 | if (!ufs_cg_chkmagic(sb, ucg)) |
92 | ufs_panic (sb, "ufs_free_fragments", "internal error, bad cg magic number"); |
93 | |
94 | ucg->cg_time = cpu_to_fs32(sb, get_seconds()); |
95 | |
96 | is_directory = S_ISDIR(inode->i_mode); |
97 | |
98 | dquot_free_inode(inode); |
99 | dquot_drop(inode); |
100 | |
101 | clear_inode (inode); |
102 | |
103 | if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit)) |
104 | ufs_error(sb, "ufs_free_inode", "bit already cleared for inode %u", ino); |
105 | else { |
106 | ubh_clrbit (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit); |
107 | if (ino < ucpi->c_irotor) |
108 | ucpi->c_irotor = ino; |
109 | fs32_add(sb, &ucg->cg_cs.cs_nifree, 1); |
110 | uspi->cs_total.cs_nifree++; |
111 | fs32_add(sb, &UFS_SB(sb)->fs_cs(cg).cs_nifree, 1); |
112 | |
113 | if (is_directory) { |
114 | fs32_sub(sb, &ucg->cg_cs.cs_ndir, 1); |
115 | uspi->cs_total.cs_ndir--; |
116 | fs32_sub(sb, &UFS_SB(sb)->fs_cs(cg).cs_ndir, 1); |
117 | } |
118 | } |
119 | |
120 | ubh_mark_buffer_dirty (USPI_UBH(uspi)); |
121 | ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); |
122 | if (sb->s_flags & MS_SYNCHRONOUS) { |
123 | ubh_ll_rw_block(SWRITE, UCPI_UBH(ucpi)); |
124 | ubh_wait_on_buffer (UCPI_UBH(ucpi)); |
125 | } |
126 | |
127 | sb->s_dirt = 1; |
128 | unlock_super (sb); |
129 | UFSD("EXIT\n"); |
130 | } |
131 | |
132 | /* |
133 | * Nullify new chunk of inodes, |
134 | * BSD people also set ui_gen field of inode |
135 | * during nullification, but we not care about |
136 | * that because of linux ufs do not support NFS |
137 | */ |
138 | static void ufs2_init_inodes_chunk(struct super_block *sb, |
139 | struct ufs_cg_private_info *ucpi, |
140 | struct ufs_cylinder_group *ucg) |
141 | { |
142 | struct buffer_head *bh; |
143 | struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi; |
144 | sector_t beg = uspi->s_sbbase + |
145 | ufs_inotofsba(ucpi->c_cgx * uspi->s_ipg + |
146 | fs32_to_cpu(sb, ucg->cg_u.cg_u2.cg_initediblk)); |
147 | sector_t end = beg + uspi->s_fpb; |
148 | |
149 | UFSD("ENTER cgno %d\n", ucpi->c_cgx); |
150 | |
151 | for (; beg < end; ++beg) { |
152 | bh = sb_getblk(sb, beg); |
153 | lock_buffer(bh); |
154 | memset(bh->b_data, 0, sb->s_blocksize); |
155 | set_buffer_uptodate(bh); |
156 | mark_buffer_dirty(bh); |
157 | unlock_buffer(bh); |
158 | if (sb->s_flags & MS_SYNCHRONOUS) |
159 | sync_dirty_buffer(bh); |
160 | brelse(bh); |
161 | } |
162 | |
163 | fs32_add(sb, &ucg->cg_u.cg_u2.cg_initediblk, uspi->s_inopb); |
164 | ubh_mark_buffer_dirty(UCPI_UBH(ucpi)); |
165 | if (sb->s_flags & MS_SYNCHRONOUS) { |
166 | ubh_ll_rw_block(SWRITE, UCPI_UBH(ucpi)); |
167 | ubh_wait_on_buffer(UCPI_UBH(ucpi)); |
168 | } |
169 | |
170 | UFSD("EXIT\n"); |
171 | } |
172 | |
173 | /* |
174 | * There are two policies for allocating an inode. If the new inode is |
175 | * a directory, then a forward search is made for a block group with both |
176 | * free space and a low directory-to-inode ratio; if that fails, then of |
177 | * the groups with above-average free space, that group with the fewest |
178 | * directories already is chosen. |
179 | * |
180 | * For other inodes, search forward from the parent directory's block |
181 | * group to find a free inode. |
182 | */ |
183 | struct inode * ufs_new_inode(struct inode * dir, int mode) |
184 | { |
185 | struct super_block * sb; |
186 | struct ufs_sb_info * sbi; |
187 | struct ufs_sb_private_info * uspi; |
188 | struct ufs_super_block_first * usb1; |
189 | struct ufs_cg_private_info * ucpi; |
190 | struct ufs_cylinder_group * ucg; |
191 | struct inode * inode; |
192 | unsigned cg, bit, i, j, start; |
193 | struct ufs_inode_info *ufsi; |
194 | int err = -ENOSPC; |
195 | |
196 | UFSD("ENTER\n"); |
197 | |
198 | /* Cannot create files in a deleted directory */ |
199 | if (!dir || !dir->i_nlink) |
200 | return ERR_PTR(-EPERM); |
201 | sb = dir->i_sb; |
202 | inode = new_inode(sb); |
203 | if (!inode) |
204 | return ERR_PTR(-ENOMEM); |
205 | ufsi = UFS_I(inode); |
206 | sbi = UFS_SB(sb); |
207 | uspi = sbi->s_uspi; |
208 | usb1 = ubh_get_usb_first(uspi); |
209 | |
210 | lock_super (sb); |
211 | |
212 | /* |
213 | * Try to place the inode in its parent directory |
214 | */ |
215 | i = ufs_inotocg(dir->i_ino); |
216 | if (sbi->fs_cs(i).cs_nifree) { |
217 | cg = i; |
218 | goto cg_found; |
219 | } |
220 | |
221 | /* |
222 | * Use a quadratic hash to find a group with a free inode |
223 | */ |
224 | for ( j = 1; j < uspi->s_ncg; j <<= 1 ) { |
225 | i += j; |
226 | if (i >= uspi->s_ncg) |
227 | i -= uspi->s_ncg; |
228 | if (sbi->fs_cs(i).cs_nifree) { |
229 | cg = i; |
230 | goto cg_found; |
231 | } |
232 | } |
233 | |
234 | /* |
235 | * That failed: try linear search for a free inode |
236 | */ |
237 | i = ufs_inotocg(dir->i_ino) + 1; |
238 | for (j = 2; j < uspi->s_ncg; j++) { |
239 | i++; |
240 | if (i >= uspi->s_ncg) |
241 | i = 0; |
242 | if (sbi->fs_cs(i).cs_nifree) { |
243 | cg = i; |
244 | goto cg_found; |
245 | } |
246 | } |
247 | |
248 | goto failed; |
249 | |
250 | cg_found: |
251 | ucpi = ufs_load_cylinder (sb, cg); |
252 | if (!ucpi) { |
253 | err = -EIO; |
254 | goto failed; |
255 | } |
256 | ucg = ubh_get_ucg(UCPI_UBH(ucpi)); |
257 | if (!ufs_cg_chkmagic(sb, ucg)) |
258 | ufs_panic (sb, "ufs_new_inode", "internal error, bad cg magic number"); |
259 | |
260 | start = ucpi->c_irotor; |
261 | bit = ubh_find_next_zero_bit (UCPI_UBH(ucpi), ucpi->c_iusedoff, uspi->s_ipg, start); |
262 | if (!(bit < uspi->s_ipg)) { |
263 | bit = ubh_find_first_zero_bit (UCPI_UBH(ucpi), ucpi->c_iusedoff, start); |
264 | if (!(bit < start)) { |
265 | ufs_error (sb, "ufs_new_inode", |
266 | "cylinder group %u corrupted - error in inode bitmap\n", cg); |
267 | err = -EIO; |
268 | goto failed; |
269 | } |
270 | } |
271 | UFSD("start = %u, bit = %u, ipg = %u\n", start, bit, uspi->s_ipg); |
272 | if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit)) |
273 | ubh_setbit (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit); |
274 | else { |
275 | ufs_panic (sb, "ufs_new_inode", "internal error"); |
276 | err = -EIO; |
277 | goto failed; |
278 | } |
279 | |
280 | if (uspi->fs_magic == UFS2_MAGIC) { |
281 | u32 initediblk = fs32_to_cpu(sb, ucg->cg_u.cg_u2.cg_initediblk); |
282 | |
283 | if (bit + uspi->s_inopb > initediblk && |
284 | initediblk < fs32_to_cpu(sb, ucg->cg_u.cg_u2.cg_niblk)) |
285 | ufs2_init_inodes_chunk(sb, ucpi, ucg); |
286 | } |
287 | |
288 | fs32_sub(sb, &ucg->cg_cs.cs_nifree, 1); |
289 | uspi->cs_total.cs_nifree--; |
290 | fs32_sub(sb, &sbi->fs_cs(cg).cs_nifree, 1); |
291 | |
292 | if (S_ISDIR(mode)) { |
293 | fs32_add(sb, &ucg->cg_cs.cs_ndir, 1); |
294 | uspi->cs_total.cs_ndir++; |
295 | fs32_add(sb, &sbi->fs_cs(cg).cs_ndir, 1); |
296 | } |
297 | ubh_mark_buffer_dirty (USPI_UBH(uspi)); |
298 | ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); |
299 | if (sb->s_flags & MS_SYNCHRONOUS) { |
300 | ubh_ll_rw_block(SWRITE, UCPI_UBH(ucpi)); |
301 | ubh_wait_on_buffer (UCPI_UBH(ucpi)); |
302 | } |
303 | sb->s_dirt = 1; |
304 | |
305 | inode->i_ino = cg * uspi->s_ipg + bit; |
306 | inode->i_mode = mode; |
307 | inode->i_uid = current_fsuid(); |
308 | if (dir->i_mode & S_ISGID) { |
309 | inode->i_gid = dir->i_gid; |
310 | if (S_ISDIR(mode)) |
311 | inode->i_mode |= S_ISGID; |
312 | } else |
313 | inode->i_gid = current_fsgid(); |
314 | |
315 | inode->i_blocks = 0; |
316 | inode->i_generation = 0; |
317 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; |
318 | ufsi->i_flags = UFS_I(dir)->i_flags; |
319 | ufsi->i_lastfrag = 0; |
320 | ufsi->i_shadow = 0; |
321 | ufsi->i_osync = 0; |
322 | ufsi->i_oeftflag = 0; |
323 | ufsi->i_dir_start_lookup = 0; |
324 | memset(&ufsi->i_u1, 0, sizeof(ufsi->i_u1)); |
325 | insert_inode_hash(inode); |
326 | mark_inode_dirty(inode); |
327 | |
328 | if (uspi->fs_magic == UFS2_MAGIC) { |
329 | struct buffer_head *bh; |
330 | struct ufs2_inode *ufs2_inode; |
331 | |
332 | /* |
333 | * setup birth date, we do it here because of there is no sense |
334 | * to hold it in struct ufs_inode_info, and lose 64 bit |
335 | */ |
336 | bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino)); |
337 | if (!bh) { |
338 | ufs_warning(sb, "ufs_read_inode", |
339 | "unable to read inode %lu\n", |
340 | inode->i_ino); |
341 | err = -EIO; |
342 | goto fail_remove_inode; |
343 | } |
344 | lock_buffer(bh); |
345 | ufs2_inode = (struct ufs2_inode *)bh->b_data; |
346 | ufs2_inode += ufs_inotofsbo(inode->i_ino); |
347 | ufs2_inode->ui_birthtime = cpu_to_fs64(sb, CURRENT_TIME.tv_sec); |
348 | ufs2_inode->ui_birthnsec = cpu_to_fs32(sb, CURRENT_TIME.tv_nsec); |
349 | mark_buffer_dirty(bh); |
350 | unlock_buffer(bh); |
351 | if (sb->s_flags & MS_SYNCHRONOUS) |
352 | sync_dirty_buffer(bh); |
353 | brelse(bh); |
354 | } |
355 | |
356 | unlock_super (sb); |
357 | |
358 | dquot_initialize(inode); |
359 | err = dquot_alloc_inode(inode); |
360 | if (err) { |
361 | dquot_drop(inode); |
362 | goto fail_without_unlock; |
363 | } |
364 | |
365 | UFSD("allocating inode %lu\n", inode->i_ino); |
366 | UFSD("EXIT\n"); |
367 | return inode; |
368 | |
369 | fail_remove_inode: |
370 | unlock_super(sb); |
371 | fail_without_unlock: |
372 | inode->i_flags |= S_NOQUOTA; |
373 | inode->i_nlink = 0; |
374 | iput(inode); |
375 | UFSD("EXIT (FAILED): err %d\n", err); |
376 | return ERR_PTR(err); |
377 | failed: |
378 | unlock_super (sb); |
379 | make_bad_inode(inode); |
380 | iput (inode); |
381 | UFSD("EXIT (FAILED): err %d\n", err); |
382 | return ERR_PTR(err); |
383 | } |
384 |
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