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1 // SPDX-License-Identifier: GPL-2.0
3 * linux/fs/ufs/ialloc.c
6 * Daniel Pirkl <daniel.pirkl@email.cz>
7 * Charles University, Faculty of Mathematics and Physics
11 * linux/fs/ext2/ialloc.c
13 * Copyright (C) 1992, 1993, 1994, 1995
14 * Remy Card (card@masi.ibp.fr)
15 * Laboratoire MASI - Institut Blaise Pascal
16 * Universite Pierre et Marie Curie (Paris VI)
18 * BSD ufs-inspired inode and directory allocation by
19 * Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
20 * Big-endian to little-endian byte-swapping/bitmaps by
21 * David S. Miller (davem@caip.rutgers.edu), 1995
23 * UFS2 write support added by
24 * Evgeniy Dushistov <dushistov@mail.ru>, 2007
28 #include <linux/time.h>
29 #include <linux/stat.h>
30 #include <linux/string.h>
31 #include <linux/buffer_head.h>
32 #include <linux/sched.h>
33 #include <linux/bitops.h>
34 #include <asm/byteorder.h>
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.
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.
57 void ufs_free_inode (struct inode
* inode
)
59 struct super_block
* sb
;
60 struct ufs_sb_private_info
* uspi
;
61 struct ufs_cg_private_info
* ucpi
;
62 struct ufs_cylinder_group
* ucg
;
64 unsigned ino
, cg
, bit
;
66 UFSD("ENTER, ino %lu\n", inode
->i_ino
);
69 uspi
= UFS_SB(sb
)->s_uspi
;
73 mutex_lock(&UFS_SB(sb
)->s_lock
);
75 if (!((ino
> 1) && (ino
< (uspi
->s_ncg
* uspi
->s_ipg
)))) {
76 ufs_warning(sb
, "ufs_free_inode", "reserved inode or nonexistent inode %u\n", ino
);
77 mutex_unlock(&UFS_SB(sb
)->s_lock
);
81 cg
= ufs_inotocg (ino
);
82 bit
= ufs_inotocgoff (ino
);
83 ucpi
= ufs_load_cylinder (sb
, cg
);
85 mutex_unlock(&UFS_SB(sb
)->s_lock
);
88 ucg
= ubh_get_ucg(UCPI_UBH(ucpi
));
89 if (!ufs_cg_chkmagic(sb
, ucg
))
90 ufs_panic (sb
, "ufs_free_fragments", "internal error, bad cg magic number");
92 ucg
->cg_time
= cpu_to_fs32(sb
, get_seconds());
94 is_directory
= S_ISDIR(inode
->i_mode
);
96 if (ubh_isclr (UCPI_UBH(ucpi
), ucpi
->c_iusedoff
, bit
))
97 ufs_error(sb
, "ufs_free_inode", "bit already cleared for inode %u", ino
);
99 ubh_clrbit (UCPI_UBH(ucpi
), ucpi
->c_iusedoff
, bit
);
100 if (ino
< ucpi
->c_irotor
)
101 ucpi
->c_irotor
= ino
;
102 fs32_add(sb
, &ucg
->cg_cs
.cs_nifree
, 1);
103 uspi
->cs_total
.cs_nifree
++;
104 fs32_add(sb
, &UFS_SB(sb
)->fs_cs(cg
).cs_nifree
, 1);
107 fs32_sub(sb
, &ucg
->cg_cs
.cs_ndir
, 1);
108 uspi
->cs_total
.cs_ndir
--;
109 fs32_sub(sb
, &UFS_SB(sb
)->fs_cs(cg
).cs_ndir
, 1);
113 ubh_mark_buffer_dirty (USPI_UBH(uspi
));
114 ubh_mark_buffer_dirty (UCPI_UBH(ucpi
));
115 if (sb
->s_flags
& SB_SYNCHRONOUS
)
116 ubh_sync_block(UCPI_UBH(ucpi
));
118 ufs_mark_sb_dirty(sb
);
119 mutex_unlock(&UFS_SB(sb
)->s_lock
);
124 * Nullify new chunk of inodes,
125 * BSD people also set ui_gen field of inode
126 * during nullification, but we not care about
127 * that because of linux ufs do not support NFS
129 static void ufs2_init_inodes_chunk(struct super_block
*sb
,
130 struct ufs_cg_private_info
*ucpi
,
131 struct ufs_cylinder_group
*ucg
)
133 struct buffer_head
*bh
;
134 struct ufs_sb_private_info
*uspi
= UFS_SB(sb
)->s_uspi
;
135 sector_t beg
= uspi
->s_sbbase
+
136 ufs_inotofsba(ucpi
->c_cgx
* uspi
->s_ipg
+
137 fs32_to_cpu(sb
, ucg
->cg_u
.cg_u2
.cg_initediblk
));
138 sector_t end
= beg
+ uspi
->s_fpb
;
140 UFSD("ENTER cgno %d\n", ucpi
->c_cgx
);
142 for (; beg
< end
; ++beg
) {
143 bh
= sb_getblk(sb
, beg
);
145 memset(bh
->b_data
, 0, sb
->s_blocksize
);
146 set_buffer_uptodate(bh
);
147 mark_buffer_dirty(bh
);
149 if (sb
->s_flags
& SB_SYNCHRONOUS
)
150 sync_dirty_buffer(bh
);
154 fs32_add(sb
, &ucg
->cg_u
.cg_u2
.cg_initediblk
, uspi
->s_inopb
);
155 ubh_mark_buffer_dirty(UCPI_UBH(ucpi
));
156 if (sb
->s_flags
& SB_SYNCHRONOUS
)
157 ubh_sync_block(UCPI_UBH(ucpi
));
163 * There are two policies for allocating an inode. If the new inode is
164 * a directory, then a forward search is made for a block group with both
165 * free space and a low directory-to-inode ratio; if that fails, then of
166 * the groups with above-average free space, that group with the fewest
167 * directories already is chosen.
169 * For other inodes, search forward from the parent directory's block
170 * group to find a free inode.
172 struct inode
*ufs_new_inode(struct inode
*dir
, umode_t mode
)
174 struct super_block
* sb
;
175 struct ufs_sb_info
* sbi
;
176 struct ufs_sb_private_info
* uspi
;
177 struct ufs_cg_private_info
* ucpi
;
178 struct ufs_cylinder_group
* ucg
;
179 struct inode
* inode
;
180 struct timespec64 ts
;
181 unsigned cg
, bit
, i
, j
, start
;
182 struct ufs_inode_info
*ufsi
;
187 /* Cannot create files in a deleted directory */
188 if (!dir
|| !dir
->i_nlink
)
189 return ERR_PTR(-EPERM
);
191 inode
= new_inode(sb
);
193 return ERR_PTR(-ENOMEM
);
198 mutex_lock(&sbi
->s_lock
);
201 * Try to place the inode in its parent directory
203 i
= ufs_inotocg(dir
->i_ino
);
204 if (sbi
->fs_cs(i
).cs_nifree
) {
210 * Use a quadratic hash to find a group with a free inode
212 for ( j
= 1; j
< uspi
->s_ncg
; j
<<= 1 ) {
214 if (i
>= uspi
->s_ncg
)
216 if (sbi
->fs_cs(i
).cs_nifree
) {
223 * That failed: try linear search for a free inode
225 i
= ufs_inotocg(dir
->i_ino
) + 1;
226 for (j
= 2; j
< uspi
->s_ncg
; j
++) {
228 if (i
>= uspi
->s_ncg
)
230 if (sbi
->fs_cs(i
).cs_nifree
) {
239 ucpi
= ufs_load_cylinder (sb
, cg
);
244 ucg
= ubh_get_ucg(UCPI_UBH(ucpi
));
245 if (!ufs_cg_chkmagic(sb
, ucg
))
246 ufs_panic (sb
, "ufs_new_inode", "internal error, bad cg magic number");
248 start
= ucpi
->c_irotor
;
249 bit
= ubh_find_next_zero_bit (UCPI_UBH(ucpi
), ucpi
->c_iusedoff
, uspi
->s_ipg
, start
);
250 if (!(bit
< uspi
->s_ipg
)) {
251 bit
= ubh_find_first_zero_bit (UCPI_UBH(ucpi
), ucpi
->c_iusedoff
, start
);
252 if (!(bit
< start
)) {
253 ufs_error (sb
, "ufs_new_inode",
254 "cylinder group %u corrupted - error in inode bitmap\n", cg
);
259 UFSD("start = %u, bit = %u, ipg = %u\n", start
, bit
, uspi
->s_ipg
);
260 if (ubh_isclr (UCPI_UBH(ucpi
), ucpi
->c_iusedoff
, bit
))
261 ubh_setbit (UCPI_UBH(ucpi
), ucpi
->c_iusedoff
, bit
);
263 ufs_panic (sb
, "ufs_new_inode", "internal error");
268 if (uspi
->fs_magic
== UFS2_MAGIC
) {
269 u32 initediblk
= fs32_to_cpu(sb
, ucg
->cg_u
.cg_u2
.cg_initediblk
);
271 if (bit
+ uspi
->s_inopb
> initediblk
&&
272 initediblk
< fs32_to_cpu(sb
, ucg
->cg_u
.cg_u2
.cg_niblk
))
273 ufs2_init_inodes_chunk(sb
, ucpi
, ucg
);
276 fs32_sub(sb
, &ucg
->cg_cs
.cs_nifree
, 1);
277 uspi
->cs_total
.cs_nifree
--;
278 fs32_sub(sb
, &sbi
->fs_cs(cg
).cs_nifree
, 1);
281 fs32_add(sb
, &ucg
->cg_cs
.cs_ndir
, 1);
282 uspi
->cs_total
.cs_ndir
++;
283 fs32_add(sb
, &sbi
->fs_cs(cg
).cs_ndir
, 1);
285 ubh_mark_buffer_dirty (USPI_UBH(uspi
));
286 ubh_mark_buffer_dirty (UCPI_UBH(ucpi
));
287 if (sb
->s_flags
& SB_SYNCHRONOUS
)
288 ubh_sync_block(UCPI_UBH(ucpi
));
289 ufs_mark_sb_dirty(sb
);
291 inode
->i_ino
= cg
* uspi
->s_ipg
+ bit
;
292 inode_init_owner(inode
, dir
, mode
);
294 inode
->i_generation
= 0;
295 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= current_time(inode
);
296 ufsi
->i_flags
= UFS_I(dir
)->i_flags
;
297 ufsi
->i_lastfrag
= 0;
300 ufsi
->i_oeftflag
= 0;
301 ufsi
->i_dir_start_lookup
= 0;
302 memset(&ufsi
->i_u1
, 0, sizeof(ufsi
->i_u1
));
303 if (insert_inode_locked(inode
) < 0) {
307 mark_inode_dirty(inode
);
309 if (uspi
->fs_magic
== UFS2_MAGIC
) {
310 struct buffer_head
*bh
;
311 struct ufs2_inode
*ufs2_inode
;
314 * setup birth date, we do it here because of there is no sense
315 * to hold it in struct ufs_inode_info, and lose 64 bit
317 bh
= sb_bread(sb
, uspi
->s_sbbase
+ ufs_inotofsba(inode
->i_ino
));
319 ufs_warning(sb
, "ufs_read_inode",
320 "unable to read inode %lu\n",
323 goto fail_remove_inode
;
326 ufs2_inode
= (struct ufs2_inode
*)bh
->b_data
;
327 ufs2_inode
+= ufs_inotofsbo(inode
->i_ino
);
328 ktime_get_real_ts64(&ts
);
329 ufs2_inode
->ui_birthtime
= cpu_to_fs64(sb
, ts
.tv_sec
);
330 ufs2_inode
->ui_birthnsec
= cpu_to_fs32(sb
, ts
.tv_nsec
);
331 mark_buffer_dirty(bh
);
333 if (sb
->s_flags
& SB_SYNCHRONOUS
)
334 sync_dirty_buffer(bh
);
337 mutex_unlock(&sbi
->s_lock
);
339 UFSD("allocating inode %lu\n", inode
->i_ino
);
344 mutex_unlock(&sbi
->s_lock
);
346 unlock_new_inode(inode
);
348 UFSD("EXIT (FAILED): err %d\n", err
);
351 mutex_unlock(&sbi
->s_lock
);
352 make_bad_inode(inode
);
354 UFSD("EXIT (FAILED): err %d\n", err
);