/*
|
/*
|
* linux/fs/ext/freelists.c
|
* linux/fs/ext/freelists.c
|
*
|
*
|
* Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
|
* Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
|
*
|
*
|
*/
|
*/
|
|
|
/* freelists.c contains the code that handles the inode and block free lists */
|
/* freelists.c contains the code that handles the inode and block free lists */
|
|
|
|
|
/*
|
/*
|
|
|
The free blocks are managed by a linked list. The super block contains the
|
The free blocks are managed by a linked list. The super block contains the
|
number of the first free block. This block contains 254 numbers of other
|
number of the first free block. This block contains 254 numbers of other
|
free blocks and the number of the next block in the list.
|
free blocks and the number of the next block in the list.
|
|
|
When an ext fs is mounted, the number of the first free block is stored
|
When an ext fs is mounted, the number of the first free block is stored
|
in s->u.ext_sb.s_firstfreeblocknumber and the block header is stored in
|
in s->u.ext_sb.s_firstfreeblocknumber and the block header is stored in
|
s->u.ext_sb.s_firstfreeblock. u.ext_sb.s_freeblockscount contains the count
|
s->u.ext_sb.s_firstfreeblock. u.ext_sb.s_freeblockscount contains the count
|
of free blocks.
|
of free blocks.
|
|
|
The free inodes are also managed by a linked list in a similar way. The
|
The free inodes are also managed by a linked list in a similar way. The
|
super block contains the number of the first free inode. This inode contains
|
super block contains the number of the first free inode. This inode contains
|
14 numbers of other free inodes and the number of the next inode in the list.
|
14 numbers of other free inodes and the number of the next inode in the list.
|
|
|
The number of the first free inode is stored in
|
The number of the first free inode is stored in
|
s->u.ext_sb.s_firstfreeinodenumber and the header of the block containing
|
s->u.ext_sb.s_firstfreeinodenumber and the header of the block containing
|
the inode is stored in s->u.ext_sb.s_firstfreeinodeblock.
|
the inode is stored in s->u.ext_sb.s_firstfreeinodeblock.
|
u.ext_sb.s_freeinodescount contains the count of free inodes.
|
u.ext_sb.s_freeinodescount contains the count of free inodes.
|
|
|
*/
|
*/
|
|
|
#include <linux/sched.h>
|
#include <linux/sched.h>
|
#include <linux/ext_fs.h>
|
#include <linux/ext_fs.h>
|
#include <linux/stat.h>
|
#include <linux/stat.h>
|
#include <linux/kernel.h>
|
#include <linux/kernel.h>
|
#include <linux/string.h>
|
#include <linux/string.h>
|
#include <linux/locks.h>
|
#include <linux/locks.h>
|
|
|
void ext_free_block(struct super_block * sb, int block)
|
void ext_free_block(struct super_block * sb, int block)
|
{
|
{
|
struct buffer_head * bh;
|
struct buffer_head * bh;
|
struct ext_free_block * efb;
|
struct ext_free_block * efb;
|
|
|
if (!sb) {
|
if (!sb) {
|
printk("trying to free block on non-existent device\n");
|
printk("trying to free block on non-existent device\n");
|
return;
|
return;
|
}
|
}
|
lock_super (sb);
|
lock_super (sb);
|
if (block < sb->u.ext_sb.s_firstdatazone ||
|
if (block < sb->u.ext_sb.s_firstdatazone ||
|
block >= sb->u.ext_sb.s_nzones) {
|
block >= sb->u.ext_sb.s_nzones) {
|
printk("trying to free block not in datazone\n");
|
printk("trying to free block not in datazone\n");
|
return;
|
return;
|
}
|
}
|
bh = get_hash_table(sb->s_dev, block, sb->s_blocksize);
|
bh = get_hash_table(sb->s_dev, block, sb->s_blocksize);
|
if (bh)
|
if (bh)
|
mark_buffer_clean(bh);
|
mark_buffer_clean(bh);
|
brelse(bh);
|
brelse(bh);
|
if (sb->u.ext_sb.s_firstfreeblock)
|
if (sb->u.ext_sb.s_firstfreeblock)
|
efb = (struct ext_free_block *) sb->u.ext_sb.s_firstfreeblock->b_data;
|
efb = (struct ext_free_block *) sb->u.ext_sb.s_firstfreeblock->b_data;
|
if (!sb->u.ext_sb.s_firstfreeblock || efb->count == 254) {
|
if (!sb->u.ext_sb.s_firstfreeblock || efb->count == 254) {
|
#ifdef EXTFS_DEBUG
|
#ifdef EXTFS_DEBUG
|
printk("ext_free_block: block full, skipping to %d\n", block);
|
printk("ext_free_block: block full, skipping to %d\n", block);
|
#endif
|
#endif
|
if (sb->u.ext_sb.s_firstfreeblock)
|
if (sb->u.ext_sb.s_firstfreeblock)
|
brelse (sb->u.ext_sb.s_firstfreeblock);
|
brelse (sb->u.ext_sb.s_firstfreeblock);
|
if (!(sb->u.ext_sb.s_firstfreeblock = bread (sb->s_dev,
|
if (!(sb->u.ext_sb.s_firstfreeblock = bread (sb->s_dev,
|
block, sb->s_blocksize)))
|
block, sb->s_blocksize)))
|
panic ("ext_free_block: unable to read block to free\n");
|
panic ("ext_free_block: unable to read block to free\n");
|
efb = (struct ext_free_block *) sb->u.ext_sb.s_firstfreeblock->b_data;
|
efb = (struct ext_free_block *) sb->u.ext_sb.s_firstfreeblock->b_data;
|
efb->next = sb->u.ext_sb.s_firstfreeblocknumber;
|
efb->next = sb->u.ext_sb.s_firstfreeblocknumber;
|
efb->count = 0;
|
efb->count = 0;
|
sb->u.ext_sb.s_firstfreeblocknumber = block;
|
sb->u.ext_sb.s_firstfreeblocknumber = block;
|
} else {
|
} else {
|
efb->free[efb->count++] = block;
|
efb->free[efb->count++] = block;
|
}
|
}
|
sb->u.ext_sb.s_freeblockscount ++;
|
sb->u.ext_sb.s_freeblockscount ++;
|
sb->s_dirt = 1;
|
sb->s_dirt = 1;
|
mark_buffer_dirty(sb->u.ext_sb.s_firstfreeblock, 1);
|
mark_buffer_dirty(sb->u.ext_sb.s_firstfreeblock, 1);
|
unlock_super (sb);
|
unlock_super (sb);
|
return;
|
return;
|
}
|
}
|
|
|
int ext_new_block(struct super_block * sb)
|
int ext_new_block(struct super_block * sb)
|
{
|
{
|
struct buffer_head * bh;
|
struct buffer_head * bh;
|
struct ext_free_block * efb;
|
struct ext_free_block * efb;
|
int j;
|
int j;
|
|
|
if (!sb) {
|
if (!sb) {
|
printk("trying to get new block from non-existent device\n");
|
printk("trying to get new block from non-existent device\n");
|
return 0;
|
return 0;
|
}
|
}
|
if (!sb->u.ext_sb.s_firstfreeblock)
|
if (!sb->u.ext_sb.s_firstfreeblock)
|
return 0;
|
return 0;
|
lock_super (sb);
|
lock_super (sb);
|
efb = (struct ext_free_block *) sb->u.ext_sb.s_firstfreeblock->b_data;
|
efb = (struct ext_free_block *) sb->u.ext_sb.s_firstfreeblock->b_data;
|
if (efb->count) {
|
if (efb->count) {
|
j = efb->free[--efb->count];
|
j = efb->free[--efb->count];
|
mark_buffer_dirty(sb->u.ext_sb.s_firstfreeblock, 1);
|
mark_buffer_dirty(sb->u.ext_sb.s_firstfreeblock, 1);
|
} else {
|
} else {
|
#ifdef EXTFS_DEBUG
|
#ifdef EXTFS_DEBUG
|
printk("ext_new_block: block empty, skipping to %d\n", efb->next);
|
printk("ext_new_block: block empty, skipping to %d\n", efb->next);
|
#endif
|
#endif
|
j = sb->u.ext_sb.s_firstfreeblocknumber;
|
j = sb->u.ext_sb.s_firstfreeblocknumber;
|
sb->u.ext_sb.s_firstfreeblocknumber = efb->next;
|
sb->u.ext_sb.s_firstfreeblocknumber = efb->next;
|
brelse (sb->u.ext_sb.s_firstfreeblock);
|
brelse (sb->u.ext_sb.s_firstfreeblock);
|
if (!sb->u.ext_sb.s_firstfreeblocknumber) {
|
if (!sb->u.ext_sb.s_firstfreeblocknumber) {
|
sb->u.ext_sb.s_firstfreeblock = NULL;
|
sb->u.ext_sb.s_firstfreeblock = NULL;
|
} else {
|
} else {
|
if (!(sb->u.ext_sb.s_firstfreeblock = bread (sb->s_dev,
|
if (!(sb->u.ext_sb.s_firstfreeblock = bread (sb->s_dev,
|
sb->u.ext_sb.s_firstfreeblocknumber,
|
sb->u.ext_sb.s_firstfreeblocknumber,
|
sb->s_blocksize)))
|
sb->s_blocksize)))
|
panic ("ext_new_block: unable to read next free block\n");
|
panic ("ext_new_block: unable to read next free block\n");
|
}
|
}
|
}
|
}
|
if (j < sb->u.ext_sb.s_firstdatazone || j > sb->u.ext_sb.s_nzones) {
|
if (j < sb->u.ext_sb.s_firstdatazone || j > sb->u.ext_sb.s_nzones) {
|
printk ("ext_new_block: blk = %d\n", j);
|
printk ("ext_new_block: blk = %d\n", j);
|
printk("allocating block not in data zone\n");
|
printk("allocating block not in data zone\n");
|
return 0;
|
return 0;
|
}
|
}
|
sb->u.ext_sb.s_freeblockscount --;
|
sb->u.ext_sb.s_freeblockscount --;
|
sb->s_dirt = 1;
|
sb->s_dirt = 1;
|
|
|
if (!(bh=getblk(sb->s_dev, j, sb->s_blocksize))) {
|
if (!(bh=getblk(sb->s_dev, j, sb->s_blocksize))) {
|
printk("new_block: cannot get block");
|
printk("new_block: cannot get block");
|
return 0;
|
return 0;
|
}
|
}
|
memset(bh->b_data, 0, BLOCK_SIZE);
|
memset(bh->b_data, 0, BLOCK_SIZE);
|
mark_buffer_uptodate(bh, 1);
|
mark_buffer_uptodate(bh, 1);
|
mark_buffer_dirty(bh, 1);
|
mark_buffer_dirty(bh, 1);
|
brelse(bh);
|
brelse(bh);
|
#ifdef EXTFS_DEBUG
|
#ifdef EXTFS_DEBUG
|
printk("ext_new_block: allocating block %d\n", j);
|
printk("ext_new_block: allocating block %d\n", j);
|
#endif
|
#endif
|
unlock_super (sb);
|
unlock_super (sb);
|
return j;
|
return j;
|
}
|
}
|
|
|
unsigned long ext_count_free_blocks(struct super_block *sb)
|
unsigned long ext_count_free_blocks(struct super_block *sb)
|
{
|
{
|
#ifdef EXTFS_DEBUG
|
#ifdef EXTFS_DEBUG
|
struct buffer_head * bh;
|
struct buffer_head * bh;
|
struct ext_free_block * efb;
|
struct ext_free_block * efb;
|
unsigned long count, block;
|
unsigned long count, block;
|
|
|
lock_super (sb);
|
lock_super (sb);
|
if (!sb->u.ext_sb.s_firstfreeblock)
|
if (!sb->u.ext_sb.s_firstfreeblock)
|
count = 0;
|
count = 0;
|
else {
|
else {
|
efb = (struct ext_free_block *) sb->u.ext_sb.s_firstfreeblock->b_data;
|
efb = (struct ext_free_block *) sb->u.ext_sb.s_firstfreeblock->b_data;
|
count = efb->count + 1;
|
count = efb->count + 1;
|
block = efb->next;
|
block = efb->next;
|
while (block) {
|
while (block) {
|
if (!(bh = bread (sb->s_dev, block, sb->s_blocksize))) {
|
if (!(bh = bread (sb->s_dev, block, sb->s_blocksize))) {
|
printk ("ext_count_free: error while reading free blocks list\n");
|
printk ("ext_count_free: error while reading free blocks list\n");
|
block = 0;
|
block = 0;
|
} else {
|
} else {
|
efb = (struct ext_free_block *) bh->b_data;
|
efb = (struct ext_free_block *) bh->b_data;
|
count += efb->count + 1;
|
count += efb->count + 1;
|
block = efb->next;
|
block = efb->next;
|
brelse (bh);
|
brelse (bh);
|
}
|
}
|
}
|
}
|
}
|
}
|
printk("ext_count_free_blocks: stored = %d, computed = %d\n",
|
printk("ext_count_free_blocks: stored = %d, computed = %d\n",
|
sb->u.ext_sb.s_freeblockscount, count);
|
sb->u.ext_sb.s_freeblockscount, count);
|
unlock_super (sb);
|
unlock_super (sb);
|
return count;
|
return count;
|
#else
|
#else
|
return sb->u.ext_sb.s_freeblockscount;
|
return sb->u.ext_sb.s_freeblockscount;
|
#endif
|
#endif
|
}
|
}
|
|
|
void ext_free_inode(struct inode * inode)
|
void ext_free_inode(struct inode * inode)
|
{
|
{
|
struct buffer_head * bh;
|
struct buffer_head * bh;
|
struct ext_free_inode * efi;
|
struct ext_free_inode * efi;
|
struct super_block * sb;
|
struct super_block * sb;
|
unsigned long block;
|
unsigned long block;
|
unsigned long ino;
|
unsigned long ino;
|
kdev_t dev;
|
kdev_t dev;
|
|
|
if (!inode)
|
if (!inode)
|
return;
|
return;
|
if (!inode->i_dev) {
|
if (!inode->i_dev) {
|
printk("free_inode: inode has no device\n");
|
printk("free_inode: inode has no device\n");
|
return;
|
return;
|
}
|
}
|
if (inode->i_count != 1) {
|
if (inode->i_count != 1) {
|
printk("free_inode: inode has count=%ld\n",inode->i_count);
|
printk("free_inode: inode has count=%ld\n",inode->i_count);
|
return;
|
return;
|
}
|
}
|
if (inode->i_nlink) {
|
if (inode->i_nlink) {
|
printk("free_inode: inode has nlink=%d\n",inode->i_nlink);
|
printk("free_inode: inode has nlink=%d\n",inode->i_nlink);
|
return;
|
return;
|
}
|
}
|
if (!inode->i_sb) {
|
if (!inode->i_sb) {
|
printk("free_inode: inode on non-existent device\n");
|
printk("free_inode: inode on non-existent device\n");
|
return;
|
return;
|
}
|
}
|
sb = inode->i_sb;
|
sb = inode->i_sb;
|
ino = inode->i_ino;
|
ino = inode->i_ino;
|
dev = inode->i_dev;
|
dev = inode->i_dev;
|
clear_inode(inode);
|
clear_inode(inode);
|
lock_super (sb);
|
lock_super (sb);
|
if (ino < 1 || ino > sb->u.ext_sb.s_ninodes) {
|
if (ino < 1 || ino > sb->u.ext_sb.s_ninodes) {
|
printk("free_inode: inode 0 or non-existent inode\n");
|
printk("free_inode: inode 0 or non-existent inode\n");
|
unlock_super (sb);
|
unlock_super (sb);
|
return;
|
return;
|
}
|
}
|
if (sb->u.ext_sb.s_firstfreeinodeblock)
|
if (sb->u.ext_sb.s_firstfreeinodeblock)
|
efi = ((struct ext_free_inode *) sb->u.ext_sb.s_firstfreeinodeblock->b_data) +
|
efi = ((struct ext_free_inode *) sb->u.ext_sb.s_firstfreeinodeblock->b_data) +
|
(sb->u.ext_sb.s_firstfreeinodenumber-1)%EXT_INODES_PER_BLOCK;
|
(sb->u.ext_sb.s_firstfreeinodenumber-1)%EXT_INODES_PER_BLOCK;
|
if (!sb->u.ext_sb.s_firstfreeinodeblock || efi->count == 14) {
|
if (!sb->u.ext_sb.s_firstfreeinodeblock || efi->count == 14) {
|
#ifdef EXTFS_DEBUG
|
#ifdef EXTFS_DEBUG
|
printk("ext_free_inode: inode full, skipping to %d\n", ino);
|
printk("ext_free_inode: inode full, skipping to %d\n", ino);
|
#endif
|
#endif
|
if (sb->u.ext_sb.s_firstfreeinodeblock)
|
if (sb->u.ext_sb.s_firstfreeinodeblock)
|
brelse (sb->u.ext_sb.s_firstfreeinodeblock);
|
brelse (sb->u.ext_sb.s_firstfreeinodeblock);
|
block = 2 + (ino - 1) / EXT_INODES_PER_BLOCK;
|
block = 2 + (ino - 1) / EXT_INODES_PER_BLOCK;
|
if (!(bh = bread(dev, block, sb->s_blocksize)))
|
if (!(bh = bread(dev, block, sb->s_blocksize)))
|
panic("ext_free_inode: unable to read inode block\n");
|
panic("ext_free_inode: unable to read inode block\n");
|
efi = ((struct ext_free_inode *) bh->b_data) +
|
efi = ((struct ext_free_inode *) bh->b_data) +
|
(ino - 1) % EXT_INODES_PER_BLOCK;
|
(ino - 1) % EXT_INODES_PER_BLOCK;
|
efi->next = sb->u.ext_sb.s_firstfreeinodenumber;
|
efi->next = sb->u.ext_sb.s_firstfreeinodenumber;
|
efi->count = 0;
|
efi->count = 0;
|
sb->u.ext_sb.s_firstfreeinodenumber = ino;
|
sb->u.ext_sb.s_firstfreeinodenumber = ino;
|
sb->u.ext_sb.s_firstfreeinodeblock = bh;
|
sb->u.ext_sb.s_firstfreeinodeblock = bh;
|
} else {
|
} else {
|
efi->free[efi->count++] = ino;
|
efi->free[efi->count++] = ino;
|
}
|
}
|
sb->u.ext_sb.s_freeinodescount ++;
|
sb->u.ext_sb.s_freeinodescount ++;
|
sb->s_dirt = 1;
|
sb->s_dirt = 1;
|
mark_buffer_dirty(sb->u.ext_sb.s_firstfreeinodeblock, 1);
|
mark_buffer_dirty(sb->u.ext_sb.s_firstfreeinodeblock, 1);
|
unlock_super (sb);
|
unlock_super (sb);
|
}
|
}
|
|
|
struct inode * ext_new_inode(const struct inode * dir)
|
struct inode * ext_new_inode(const struct inode * dir)
|
{
|
{
|
struct super_block * sb;
|
struct super_block * sb;
|
struct inode * inode;
|
struct inode * inode;
|
struct ext_free_inode * efi;
|
struct ext_free_inode * efi;
|
unsigned long block;
|
unsigned long block;
|
int j;
|
int j;
|
|
|
if (!dir || !(inode=get_empty_inode()))
|
if (!dir || !(inode=get_empty_inode()))
|
return NULL;
|
return NULL;
|
sb = dir->i_sb;
|
sb = dir->i_sb;
|
inode->i_sb = sb;
|
inode->i_sb = sb;
|
inode->i_flags = sb->s_flags;
|
inode->i_flags = sb->s_flags;
|
if (!sb->u.ext_sb.s_firstfreeinodeblock)
|
if (!sb->u.ext_sb.s_firstfreeinodeblock)
|
return 0;
|
return 0;
|
lock_super (sb);
|
lock_super (sb);
|
efi = ((struct ext_free_inode *) sb->u.ext_sb.s_firstfreeinodeblock->b_data) +
|
efi = ((struct ext_free_inode *) sb->u.ext_sb.s_firstfreeinodeblock->b_data) +
|
(sb->u.ext_sb.s_firstfreeinodenumber-1)%EXT_INODES_PER_BLOCK;
|
(sb->u.ext_sb.s_firstfreeinodenumber-1)%EXT_INODES_PER_BLOCK;
|
if (efi->count) {
|
if (efi->count) {
|
j = efi->free[--efi->count];
|
j = efi->free[--efi->count];
|
mark_buffer_dirty(sb->u.ext_sb.s_firstfreeinodeblock, 1);
|
mark_buffer_dirty(sb->u.ext_sb.s_firstfreeinodeblock, 1);
|
} else {
|
} else {
|
#ifdef EXTFS_DEBUG
|
#ifdef EXTFS_DEBUG
|
printk("ext_free_inode: inode empty, skipping to %d\n", efi->next);
|
printk("ext_free_inode: inode empty, skipping to %d\n", efi->next);
|
#endif
|
#endif
|
j = sb->u.ext_sb.s_firstfreeinodenumber;
|
j = sb->u.ext_sb.s_firstfreeinodenumber;
|
if (efi->next > sb->u.ext_sb.s_ninodes) {
|
if (efi->next > sb->u.ext_sb.s_ninodes) {
|
printk ("efi->next = %ld\n", efi->next);
|
printk ("efi->next = %ld\n", efi->next);
|
panic ("ext_new_inode: bad inode number in free list\n");
|
panic ("ext_new_inode: bad inode number in free list\n");
|
}
|
}
|
sb->u.ext_sb.s_firstfreeinodenumber = efi->next;
|
sb->u.ext_sb.s_firstfreeinodenumber = efi->next;
|
block = 2 + (((unsigned long) efi->next) - 1) / EXT_INODES_PER_BLOCK;
|
block = 2 + (((unsigned long) efi->next) - 1) / EXT_INODES_PER_BLOCK;
|
brelse (sb->u.ext_sb.s_firstfreeinodeblock);
|
brelse (sb->u.ext_sb.s_firstfreeinodeblock);
|
if (!sb->u.ext_sb.s_firstfreeinodenumber) {
|
if (!sb->u.ext_sb.s_firstfreeinodenumber) {
|
sb->u.ext_sb.s_firstfreeinodeblock = NULL;
|
sb->u.ext_sb.s_firstfreeinodeblock = NULL;
|
} else {
|
} else {
|
if (!(sb->u.ext_sb.s_firstfreeinodeblock =
|
if (!(sb->u.ext_sb.s_firstfreeinodeblock =
|
bread(sb->s_dev, block, sb->s_blocksize)))
|
bread(sb->s_dev, block, sb->s_blocksize)))
|
panic ("ext_new_inode: unable to read next free inode block\n");
|
panic ("ext_new_inode: unable to read next free inode block\n");
|
}
|
}
|
}
|
}
|
sb->u.ext_sb.s_freeinodescount --;
|
sb->u.ext_sb.s_freeinodescount --;
|
sb->s_dirt = 1;
|
sb->s_dirt = 1;
|
inode->i_count = 1;
|
inode->i_count = 1;
|
inode->i_nlink = 1;
|
inode->i_nlink = 1;
|
inode->i_dev = sb->s_dev;
|
inode->i_dev = sb->s_dev;
|
inode->i_uid = current->fsuid;
|
inode->i_uid = current->fsuid;
|
inode->i_gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
|
inode->i_gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
|
inode->i_dirt = 1;
|
inode->i_dirt = 1;
|
inode->i_ino = j;
|
inode->i_ino = j;
|
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
|
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
|
inode->i_op = NULL;
|
inode->i_op = NULL;
|
inode->i_blocks = inode->i_blksize = 0;
|
inode->i_blocks = inode->i_blksize = 0;
|
insert_inode_hash(inode);
|
insert_inode_hash(inode);
|
#ifdef EXTFS_DEBUG
|
#ifdef EXTFS_DEBUG
|
printk("ext_new_inode : allocating inode %d\n", inode->i_ino);
|
printk("ext_new_inode : allocating inode %d\n", inode->i_ino);
|
#endif
|
#endif
|
unlock_super (sb);
|
unlock_super (sb);
|
return inode;
|
return inode;
|
}
|
}
|
|
|
unsigned long ext_count_free_inodes(struct super_block *sb)
|
unsigned long ext_count_free_inodes(struct super_block *sb)
|
{
|
{
|
#ifdef EXTFS_DEBUG
|
#ifdef EXTFS_DEBUG
|
struct buffer_head * bh;
|
struct buffer_head * bh;
|
struct ext_free_inode * efi;
|
struct ext_free_inode * efi;
|
unsigned long count, block, ino;
|
unsigned long count, block, ino;
|
|
|
lock_super (sb);
|
lock_super (sb);
|
if (!sb->u.ext_sb.s_firstfreeinodeblock)
|
if (!sb->u.ext_sb.s_firstfreeinodeblock)
|
count = 0;
|
count = 0;
|
else {
|
else {
|
efi = ((struct ext_free_inode *) sb->u.ext_sb.s_firstfreeinodeblock->b_data) +
|
efi = ((struct ext_free_inode *) sb->u.ext_sb.s_firstfreeinodeblock->b_data) +
|
((sb->u.ext_sb.s_firstfreeinodenumber-1)%EXT_INODES_PER_BLOCK);
|
((sb->u.ext_sb.s_firstfreeinodenumber-1)%EXT_INODES_PER_BLOCK);
|
count = efi->count + 1;
|
count = efi->count + 1;
|
ino = efi->next;
|
ino = efi->next;
|
while (ino) {
|
while (ino) {
|
if (ino < 1 || ino > sb->u.ext_sb.s_ninodes) {
|
if (ino < 1 || ino > sb->u.ext_sb.s_ninodes) {
|
printk ("u.ext_sb.s_firstfreeinodenumber = %d, ino = %d\n",
|
printk ("u.ext_sb.s_firstfreeinodenumber = %d, ino = %d\n",
|
(int) sb->u.ext_sb.s_firstfreeinodenumber,ino);
|
(int) sb->u.ext_sb.s_firstfreeinodenumber,ino);
|
panic ("ext_count_fre_inodes: bad inode number in free list\n");
|
panic ("ext_count_fre_inodes: bad inode number in free list\n");
|
}
|
}
|
block = 2 + ((ino - 1) / EXT_INODES_PER_BLOCK);
|
block = 2 + ((ino - 1) / EXT_INODES_PER_BLOCK);
|
if (!(bh = bread (sb->s_dev, block, sb->s_blocksize))) {
|
if (!(bh = bread (sb->s_dev, block, sb->s_blocksize))) {
|
printk ("ext_count_free_inodes: error while reading free inodes list\n");
|
printk ("ext_count_free_inodes: error while reading free inodes list\n");
|
block = 0;
|
block = 0;
|
} else {
|
} else {
|
efi = ((struct ext_free_inode *) bh->b_data) +
|
efi = ((struct ext_free_inode *) bh->b_data) +
|
((ino - 1) % EXT_INODES_PER_BLOCK);
|
((ino - 1) % EXT_INODES_PER_BLOCK);
|
count += efi->count + 1;
|
count += efi->count + 1;
|
ino = efi->next;
|
ino = efi->next;
|
brelse (bh);
|
brelse (bh);
|
}
|
}
|
}
|
}
|
}
|
}
|
printk("ext_count_free_inodes: stored = %d, computed = %d\n",
|
printk("ext_count_free_inodes: stored = %d, computed = %d\n",
|
sb->u.ext_sb.s_freeinodescount, count);
|
sb->u.ext_sb.s_freeinodescount, count);
|
unlock_super (sb);
|
unlock_super (sb);
|
return count;
|
return count;
|
#else
|
#else
|
return sb->u.ext_sb.s_freeinodescount;
|
return sb->u.ext_sb.s_freeinodescount;
|
#endif
|
#endif
|
}
|
}
|
|
|
