2 * linux/fs/ufs/ialloc.c
5 * Daniel Pirkl <daniel.pirkl@email.cz>
6 * Charles University, Faculty of Mathematics and Physics
10 * linux/fs/ext2/ialloc.c
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)
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
22 * UFS2 write support added by
23 * Evgeniy Dushistov <dushistov@mail.ru>, 2007
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>
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_super_block_first
* usb1
;
62 struct ufs_cg_private_info
* ucpi
;
63 struct ufs_cylinder_group
* ucg
;
65 unsigned ino
, cg
, bit
;
67 UFSD("ENTER, ino %lu\n", inode
->i_ino
);
70 uspi
= UFS_SB(sb
)->s_uspi
;
71 usb1
= ubh_get_usb_first(uspi
);
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
);
83 cg
= ufs_inotocg (ino
);
84 bit
= ufs_inotocgoff (ino
);
85 ucpi
= ufs_load_cylinder (sb
, cg
);
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");
94 ucg
->cg_time
= cpu_to_fs32(sb
, get_seconds());
96 is_directory
= S_ISDIR(inode
->i_mode
);
98 vfs_dq_free_inode(inode
);
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
);
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);
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);
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
));
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
138 static void ufs2_init_inodes_chunk(struct super_block
*sb
,
139 struct ufs_cg_private_info
*ucpi
,
140 struct ufs_cylinder_group
*ucg
)
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
;
149 UFSD("ENTER cgno %d\n", ucpi
->c_cgx
);
151 for (; beg
< end
; ++beg
) {
152 bh
= sb_getblk(sb
, beg
);
154 memset(bh
->b_data
, 0, sb
->s_blocksize
);
155 set_buffer_uptodate(bh
);
156 mark_buffer_dirty(bh
);
158 if (sb
->s_flags
& MS_SYNCHRONOUS
)
159 sync_dirty_buffer(bh
);
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
));
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.
180 * For other inodes, search forward from the parent directory's block
181 * group to find a free inode.
183 struct inode
* ufs_new_inode(struct inode
* dir
, int mode
)
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
;
198 /* Cannot create files in a deleted directory */
199 if (!dir
|| !dir
->i_nlink
)
200 return ERR_PTR(-EPERM
);
202 inode
= new_inode(sb
);
204 return ERR_PTR(-ENOMEM
);
208 usb1
= ubh_get_usb_first(uspi
);
213 * Try to place the inode in its parent directory
215 i
= ufs_inotocg(dir
->i_ino
);
216 if (sbi
->fs_cs(i
).cs_nifree
) {
222 * Use a quadratic hash to find a group with a free inode
224 for ( j
= 1; j
< uspi
->s_ncg
; j
<<= 1 ) {
226 if (i
>= uspi
->s_ncg
)
228 if (sbi
->fs_cs(i
).cs_nifree
) {
235 * That failed: try linear search for a free inode
237 i
= ufs_inotocg(dir
->i_ino
) + 1;
238 for (j
= 2; j
< uspi
->s_ncg
; j
++) {
240 if (i
>= uspi
->s_ncg
)
242 if (sbi
->fs_cs(i
).cs_nifree
) {
251 ucpi
= ufs_load_cylinder (sb
, cg
);
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");
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
);
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
);
275 ufs_panic (sb
, "ufs_new_inode", "internal error");
280 if (uspi
->fs_magic
== UFS2_MAGIC
) {
281 u32 initediblk
= fs32_to_cpu(sb
, ucg
->cg_u
.cg_u2
.cg_initediblk
);
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
);
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);
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);
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
));
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
;
311 inode
->i_mode
|= S_ISGID
;
313 inode
->i_gid
= current_fsgid();
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;
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
);
328 if (uspi
->fs_magic
== UFS2_MAGIC
) {
329 struct buffer_head
*bh
;
330 struct ufs2_inode
*ufs2_inode
;
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
336 bh
= sb_bread(sb
, uspi
->s_sbbase
+ ufs_inotofsba(inode
->i_ino
));
338 ufs_warning(sb
, "ufs_read_inode",
339 "unable to read inode %lu\n",
342 goto fail_remove_inode
;
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
);
351 if (sb
->s_flags
& MS_SYNCHRONOUS
)
352 sync_dirty_buffer(bh
);
358 if (vfs_dq_alloc_inode(inode
)) {
361 goto fail_without_unlock
;
364 UFSD("allocating inode %lu\n", inode
->i_ino
);
371 inode
->i_flags
|= S_NOQUOTA
;
374 UFSD("EXIT (FAILED): err %d\n", err
);
378 make_bad_inode(inode
);
380 UFSD("EXIT (FAILED): err %d\n", err
);
This page took 0.037852 seconds and 5 git commands to generate.