| 1 |
1628 |
jcastillo |
/*
|
| 2 |
|
|
* linux/fs/sysv/ialloc.c
|
| 3 |
|
|
*
|
| 4 |
|
|
* minix/bitmap.c
|
| 5 |
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
| 6 |
|
|
*
|
| 7 |
|
|
* ext/freelists.c
|
| 8 |
|
|
* Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
|
| 9 |
|
|
*
|
| 10 |
|
|
* xenix/alloc.c
|
| 11 |
|
|
* Copyright (C) 1992 Doug Evans
|
| 12 |
|
|
*
|
| 13 |
|
|
* coh/alloc.c
|
| 14 |
|
|
* Copyright (C) 1993 Pascal Haible, Bruno Haible
|
| 15 |
|
|
*
|
| 16 |
|
|
* sysv/ialloc.c
|
| 17 |
|
|
* Copyright (C) 1993 Bruno Haible
|
| 18 |
|
|
*
|
| 19 |
|
|
* This file contains code for allocating/freeing inodes.
|
| 20 |
|
|
*/
|
| 21 |
|
|
|
| 22 |
|
|
#include <linux/sched.h>
|
| 23 |
|
|
#include <linux/kernel.h>
|
| 24 |
|
|
#include <linux/fs.h>
|
| 25 |
|
|
#include <linux/sysv_fs.h>
|
| 26 |
|
|
#include <linux/stddef.h>
|
| 27 |
|
|
#include <linux/stat.h>
|
| 28 |
|
|
#include <linux/string.h>
|
| 29 |
|
|
#include <linux/locks.h>
|
| 30 |
|
|
|
| 31 |
|
|
/* We don't trust the value of
|
| 32 |
|
|
sb->sv_sbd2->s_tinode = *sb->sv_sb_total_free_inodes
|
| 33 |
|
|
but we nevertheless keep it up to date. */
|
| 34 |
|
|
|
| 35 |
|
|
/* An inode on disk is considered free if both i_mode == 0 and i_nlink == 0. */
|
| 36 |
|
|
|
| 37 |
|
|
/* return &sb->sv_sb_fic_inodes[i] = &sbd->s_inode[i]; */
|
| 38 |
|
|
static inline sysv_ino_t * sv_sb_fic_inode (struct super_block * sb, unsigned int i)
|
| 39 |
|
|
{
|
| 40 |
|
|
if (sb->sv_bh1 == sb->sv_bh2)
|
| 41 |
|
|
return &sb->sv_sb_fic_inodes[i];
|
| 42 |
|
|
else {
|
| 43 |
|
|
/* 512 byte Xenix FS */
|
| 44 |
|
|
unsigned int offset = offsetof(struct xenix_super_block, s_inode[i]);
|
| 45 |
|
|
if (offset < 512)
|
| 46 |
|
|
return (sysv_ino_t*)(sb->sv_sbd1 + offset);
|
| 47 |
|
|
else
|
| 48 |
|
|
return (sysv_ino_t*)(sb->sv_sbd2 + offset);
|
| 49 |
|
|
}
|
| 50 |
|
|
}
|
| 51 |
|
|
|
| 52 |
|
|
void sysv_free_inode(struct inode * inode)
|
| 53 |
|
|
{
|
| 54 |
|
|
struct super_block * sb;
|
| 55 |
|
|
unsigned int ino;
|
| 56 |
|
|
struct buffer_head * bh;
|
| 57 |
|
|
struct sysv_inode * raw_inode;
|
| 58 |
|
|
|
| 59 |
|
|
if (!inode)
|
| 60 |
|
|
return;
|
| 61 |
|
|
if (!inode->i_dev) {
|
| 62 |
|
|
printk("sysv_free_inode: inode has no device\n");
|
| 63 |
|
|
return;
|
| 64 |
|
|
}
|
| 65 |
|
|
if (inode->i_count != 1) {
|
| 66 |
|
|
printk("sysv_free_inode: inode has count=%ld\n", inode->i_count);
|
| 67 |
|
|
return;
|
| 68 |
|
|
}
|
| 69 |
|
|
if (inode->i_nlink) {
|
| 70 |
|
|
printk("sysv_free_inode: inode has nlink=%d\n", inode->i_nlink);
|
| 71 |
|
|
return;
|
| 72 |
|
|
}
|
| 73 |
|
|
if (!(sb = inode->i_sb)) {
|
| 74 |
|
|
printk("sysv_free_inode: inode on nonexistent device\n");
|
| 75 |
|
|
return;
|
| 76 |
|
|
}
|
| 77 |
|
|
ino = inode->i_ino;
|
| 78 |
|
|
if (ino <= SYSV_ROOT_INO || ino > sb->sv_ninodes) {
|
| 79 |
|
|
printk("sysv_free_inode: inode 0,1,2 or nonexistent inode\n");
|
| 80 |
|
|
return;
|
| 81 |
|
|
}
|
| 82 |
|
|
if (!(bh = sv_bread(sb, inode->i_dev, sb->sv_firstinodezone + ((ino-1) >> sb->sv_inodes_per_block_bits)))) {
|
| 83 |
|
|
printk("sysv_free_inode: unable to read inode block on device "
|
| 84 |
|
|
"%s\n", kdevname(inode->i_dev));
|
| 85 |
|
|
clear_inode(inode);
|
| 86 |
|
|
return;
|
| 87 |
|
|
}
|
| 88 |
|
|
raw_inode = (struct sysv_inode *) bh->b_data + ((ino-1) & sb->sv_inodes_per_block_1);
|
| 89 |
|
|
lock_super(sb);
|
| 90 |
|
|
if (*sb->sv_sb_fic_count < sb->sv_fic_size)
|
| 91 |
|
|
*sv_sb_fic_inode(sb,(*sb->sv_sb_fic_count)++) = ino;
|
| 92 |
|
|
(*sb->sv_sb_total_free_inodes)++;
|
| 93 |
|
|
mark_buffer_dirty(sb->sv_bh1, 1); /* super-block has been modified */
|
| 94 |
|
|
if (sb->sv_bh1 != sb->sv_bh2) mark_buffer_dirty(sb->sv_bh2, 1);
|
| 95 |
|
|
sb->s_dirt = 1; /* and needs time stamp */
|
| 96 |
|
|
memset(raw_inode, 0, sizeof(struct sysv_inode));
|
| 97 |
|
|
mark_buffer_dirty(bh, 1);
|
| 98 |
|
|
unlock_super(sb);
|
| 99 |
|
|
brelse(bh);
|
| 100 |
|
|
clear_inode(inode);
|
| 101 |
|
|
}
|
| 102 |
|
|
|
| 103 |
|
|
struct inode * sysv_new_inode(const struct inode * dir)
|
| 104 |
|
|
{
|
| 105 |
|
|
struct inode * inode;
|
| 106 |
|
|
struct super_block * sb;
|
| 107 |
|
|
struct buffer_head * bh;
|
| 108 |
|
|
struct sysv_inode * raw_inode;
|
| 109 |
|
|
int i,j,ino,block;
|
| 110 |
|
|
|
| 111 |
|
|
if (!dir || !(inode = get_empty_inode()))
|
| 112 |
|
|
return NULL;
|
| 113 |
|
|
sb = dir->i_sb;
|
| 114 |
|
|
inode->i_sb = sb;
|
| 115 |
|
|
inode->i_flags = inode->i_sb->s_flags;
|
| 116 |
|
|
lock_super(sb); /* protect against task switches */
|
| 117 |
|
|
if ((*sb->sv_sb_fic_count == 0)
|
| 118 |
|
|
|| (*sv_sb_fic_inode(sb,(*sb->sv_sb_fic_count)-1) == 0) /* Applies only to SystemV2 FS */
|
| 119 |
|
|
) {
|
| 120 |
|
|
/* Rebuild cache of free inodes: */
|
| 121 |
|
|
/* i : index into cache slot being filled */
|
| 122 |
|
|
/* ino : inode we are trying */
|
| 123 |
|
|
/* block : firstinodezone + (ino-1)/inodes_per_block */
|
| 124 |
|
|
/* j : (ino-1)%inodes_per_block */
|
| 125 |
|
|
/* bh : buffer for block */
|
| 126 |
|
|
/* raw_inode : pointer to inode ino in the block */
|
| 127 |
|
|
for (i = 0, ino = SYSV_ROOT_INO+1, block = sb->sv_firstinodezone, j = SYSV_ROOT_INO ; i < sb->sv_fic_size && block < sb->sv_firstdatazone ; block++, j = 0) {
|
| 128 |
|
|
if (!(bh = sv_bread(sb, sb->s_dev, block))) {
|
| 129 |
|
|
printk("sysv_new_inode: unable to read inode table\n");
|
| 130 |
|
|
break; /* go with what we've got */
|
| 131 |
|
|
/* FIXME: Perhaps try the next block? */
|
| 132 |
|
|
}
|
| 133 |
|
|
raw_inode = (struct sysv_inode *) bh->b_data + j;
|
| 134 |
|
|
for (; j < sb->sv_inodes_per_block && i < sb->sv_fic_size; ino++, j++, raw_inode++) {
|
| 135 |
|
|
if (raw_inode->i_mode == 0 && raw_inode->i_nlink == 0)
|
| 136 |
|
|
*sv_sb_fic_inode(sb,i++) = ino;
|
| 137 |
|
|
}
|
| 138 |
|
|
brelse(bh);
|
| 139 |
|
|
}
|
| 140 |
|
|
if (i == 0) {
|
| 141 |
|
|
iput(inode);
|
| 142 |
|
|
unlock_super(sb);
|
| 143 |
|
|
return NULL; /* no inodes available */
|
| 144 |
|
|
}
|
| 145 |
|
|
*sb->sv_sb_fic_count = i;
|
| 146 |
|
|
}
|
| 147 |
|
|
/* Now *sb->sv_sb_fic_count > 0. */
|
| 148 |
|
|
ino = *sv_sb_fic_inode(sb,--(*sb->sv_sb_fic_count));
|
| 149 |
|
|
mark_buffer_dirty(sb->sv_bh1, 1); /* super-block has been modified */
|
| 150 |
|
|
if (sb->sv_bh1 != sb->sv_bh2) mark_buffer_dirty(sb->sv_bh2, 1);
|
| 151 |
|
|
sb->s_dirt = 1; /* and needs time stamp */
|
| 152 |
|
|
inode->i_count = 1;
|
| 153 |
|
|
inode->i_nlink = 1;
|
| 154 |
|
|
inode->i_dev = sb->s_dev;
|
| 155 |
|
|
inode->i_uid = current->fsuid;
|
| 156 |
|
|
inode->i_gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
|
| 157 |
|
|
inode->i_dirt = 1;
|
| 158 |
|
|
inode->i_ino = ino;
|
| 159 |
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
|
| 160 |
|
|
inode->i_op = NULL;
|
| 161 |
|
|
inode->i_blocks = inode->i_blksize = 0;
|
| 162 |
|
|
insert_inode_hash(inode);
|
| 163 |
|
|
/* Change directory entry: */
|
| 164 |
|
|
inode->i_mode = 0; /* for sysv_write_inode() */
|
| 165 |
|
|
inode->i_size = 0; /* ditto */
|
| 166 |
|
|
sysv_write_inode(inode); /* ensure inode not allocated again */
|
| 167 |
|
|
/* FIXME: caller may call this too. */
|
| 168 |
|
|
inode->i_dirt = 1; /* cleared by sysv_write_inode() */
|
| 169 |
|
|
/* That's it. */
|
| 170 |
|
|
(*sb->sv_sb_total_free_inodes)--;
|
| 171 |
|
|
mark_buffer_dirty(sb->sv_bh2, 1); /* super-block has been modified again */
|
| 172 |
|
|
sb->s_dirt = 1; /* and needs time stamp again */
|
| 173 |
|
|
unlock_super(sb);
|
| 174 |
|
|
return inode;
|
| 175 |
|
|
}
|
| 176 |
|
|
|
| 177 |
|
|
unsigned long sysv_count_free_inodes(struct super_block * sb)
|
| 178 |
|
|
{
|
| 179 |
|
|
#if 1 /* test */
|
| 180 |
|
|
struct buffer_head * bh;
|
| 181 |
|
|
struct sysv_inode * raw_inode;
|
| 182 |
|
|
int j,block,count;
|
| 183 |
|
|
|
| 184 |
|
|
/* this causes a lot of disk traffic ... */
|
| 185 |
|
|
count = 0;
|
| 186 |
|
|
lock_super(sb);
|
| 187 |
|
|
/* i : index into cache slot being filled */
|
| 188 |
|
|
/* ino : inode we are trying */
|
| 189 |
|
|
/* block : firstinodezone + (ino-1)/inodes_per_block */
|
| 190 |
|
|
/* j : (ino-1)%inodes_per_block */
|
| 191 |
|
|
/* bh : buffer for block */
|
| 192 |
|
|
/* raw_inode : pointer to inode ino in the block */
|
| 193 |
|
|
for (block = sb->sv_firstinodezone, j = SYSV_ROOT_INO ; block < sb->sv_firstdatazone ; block++, j = 0) {
|
| 194 |
|
|
if (!(bh = sv_bread(sb, sb->s_dev, block))) {
|
| 195 |
|
|
printk("sysv_count_free_inodes: unable to read inode table\n");
|
| 196 |
|
|
break; /* go with what we've got */
|
| 197 |
|
|
/* FIXME: Perhaps try the next block? */
|
| 198 |
|
|
}
|
| 199 |
|
|
raw_inode = (struct sysv_inode *) bh->b_data + j;
|
| 200 |
|
|
for (; j < sb->sv_inodes_per_block ; j++, raw_inode++)
|
| 201 |
|
|
if (raw_inode->i_mode == 0 && raw_inode->i_nlink == 0)
|
| 202 |
|
|
count++;
|
| 203 |
|
|
brelse(bh);
|
| 204 |
|
|
}
|
| 205 |
|
|
if (count != *sb->sv_sb_total_free_inodes) {
|
| 206 |
|
|
printk("sysv_count_free_inodes: free inode count was %d, correcting to %d\n",(short)(*sb->sv_sb_total_free_inodes),count);
|
| 207 |
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
| 208 |
|
|
*sb->sv_sb_total_free_inodes = count;
|
| 209 |
|
|
mark_buffer_dirty(sb->sv_bh2, 1); /* super-block has been modified */
|
| 210 |
|
|
sb->s_dirt = 1; /* and needs time stamp */
|
| 211 |
|
|
}
|
| 212 |
|
|
}
|
| 213 |
|
|
unlock_super(sb);
|
| 214 |
|
|
return count;
|
| 215 |
|
|
#else
|
| 216 |
|
|
return *sb->sv_sb_total_free_inodes;
|
| 217 |
|
|
#endif
|
| 218 |
|
|
}
|
| 219 |
|
|
|
