/*
|
/*
|
* linux/fs/ext2/balloc.c
|
* linux/fs/ext2/balloc.c
|
*
|
*
|
* Copyright (C) 1992, 1993, 1994, 1995
|
* Copyright (C) 1992, 1993, 1994, 1995
|
* Remy Card (card@masi.ibp.fr)
|
* Remy Card (card@masi.ibp.fr)
|
* Laboratoire MASI - Institut Blaise Pascal
|
* Laboratoire MASI - Institut Blaise Pascal
|
* Universite Pierre et Marie Curie (Paris VI)
|
* Universite Pierre et Marie Curie (Paris VI)
|
*
|
*
|
* Enhanced block allocation by Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
|
* Enhanced block allocation by Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
|
* Big-endian to little-endian byte-swapping/bitmaps by
|
* Big-endian to little-endian byte-swapping/bitmaps by
|
* David S. Miller (davem@caip.rutgers.edu), 1995
|
* David S. Miller (davem@caip.rutgers.edu), 1995
|
*/
|
*/
|
|
|
#include <linux/config.h>
|
#include <linux/config.h>
|
#include <linux/fs.h>
|
#include <linux/fs.h>
|
#include <linux/ext2_fs.h>
|
#include <linux/ext2_fs.h>
|
#include <linux/locks.h>
|
#include <linux/locks.h>
|
#include <linux/quotaops.h>
|
#include <linux/quotaops.h>
|
|
|
/*
|
/*
|
* balloc.c contains the blocks allocation and deallocation routines
|
* balloc.c contains the blocks allocation and deallocation routines
|
*/
|
*/
|
|
|
/*
|
/*
|
* The free blocks are managed by bitmaps. A file system contains several
|
* The free blocks are managed by bitmaps. A file system contains several
|
* blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap
|
* blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap
|
* block for inodes, N blocks for the inode table and data blocks.
|
* block for inodes, N blocks for the inode table and data blocks.
|
*
|
*
|
* The file system contains group descriptors which are located after the
|
* The file system contains group descriptors which are located after the
|
* super block. Each descriptor contains the number of the bitmap block and
|
* super block. Each descriptor contains the number of the bitmap block and
|
* the free blocks count in the block. The descriptors are loaded in memory
|
* the free blocks count in the block. The descriptors are loaded in memory
|
* when a file system is mounted (see ext2_read_super).
|
* when a file system is mounted (see ext2_read_super).
|
*/
|
*/
|
|
|
|
|
#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
|
#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
|
|
|
struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
|
struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
|
unsigned int block_group,
|
unsigned int block_group,
|
struct buffer_head ** bh)
|
struct buffer_head ** bh)
|
{
|
{
|
unsigned long group_desc;
|
unsigned long group_desc;
|
unsigned long desc;
|
unsigned long desc;
|
struct ext2_group_desc * gdp;
|
struct ext2_group_desc * gdp;
|
|
|
if (block_group >= sb->u.ext2_sb.s_groups_count) {
|
if (block_group >= sb->u.ext2_sb.s_groups_count) {
|
ext2_error (sb, "ext2_get_group_desc",
|
ext2_error (sb, "ext2_get_group_desc",
|
"block_group >= groups_count - "
|
"block_group >= groups_count - "
|
"block_group = %d, groups_count = %lu",
|
"block_group = %d, groups_count = %lu",
|
block_group, sb->u.ext2_sb.s_groups_count);
|
block_group, sb->u.ext2_sb.s_groups_count);
|
|
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
group_desc = block_group / EXT2_DESC_PER_BLOCK(sb);
|
group_desc = block_group / EXT2_DESC_PER_BLOCK(sb);
|
desc = block_group % EXT2_DESC_PER_BLOCK(sb);
|
desc = block_group % EXT2_DESC_PER_BLOCK(sb);
|
if (!sb->u.ext2_sb.s_group_desc[group_desc]) {
|
if (!sb->u.ext2_sb.s_group_desc[group_desc]) {
|
ext2_error (sb, "ext2_get_group_desc",
|
ext2_error (sb, "ext2_get_group_desc",
|
"Group descriptor not loaded - "
|
"Group descriptor not loaded - "
|
"block_group = %d, group_desc = %lu, desc = %lu",
|
"block_group = %d, group_desc = %lu, desc = %lu",
|
block_group, group_desc, desc);
|
block_group, group_desc, desc);
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
gdp = (struct ext2_group_desc *)
|
gdp = (struct ext2_group_desc *)
|
sb->u.ext2_sb.s_group_desc[group_desc]->b_data;
|
sb->u.ext2_sb.s_group_desc[group_desc]->b_data;
|
if (bh)
|
if (bh)
|
*bh = sb->u.ext2_sb.s_group_desc[group_desc];
|
*bh = sb->u.ext2_sb.s_group_desc[group_desc];
|
return gdp + desc;
|
return gdp + desc;
|
}
|
}
|
|
|
/*
|
/*
|
* Read the bitmap for a given block_group, reading into the specified
|
* Read the bitmap for a given block_group, reading into the specified
|
* slot in the superblock's bitmap cache.
|
* slot in the superblock's bitmap cache.
|
*
|
*
|
* Return >=0 on success or a -ve error code.
|
* Return >=0 on success or a -ve error code.
|
*/
|
*/
|
|
|
static int read_block_bitmap (struct super_block * sb,
|
static int read_block_bitmap (struct super_block * sb,
|
unsigned int block_group,
|
unsigned int block_group,
|
unsigned long bitmap_nr)
|
unsigned long bitmap_nr)
|
{
|
{
|
struct ext2_group_desc * gdp;
|
struct ext2_group_desc * gdp;
|
struct buffer_head * bh = NULL;
|
struct buffer_head * bh = NULL;
|
int retval = -EIO;
|
int retval = -EIO;
|
|
|
gdp = ext2_get_group_desc (sb, block_group, NULL);
|
gdp = ext2_get_group_desc (sb, block_group, NULL);
|
if (!gdp)
|
if (!gdp)
|
goto error_out;
|
goto error_out;
|
retval = 0;
|
retval = 0;
|
bh = sb_bread(sb, le32_to_cpu(gdp->bg_block_bitmap));
|
bh = sb_bread(sb, le32_to_cpu(gdp->bg_block_bitmap));
|
if (!bh) {
|
if (!bh) {
|
ext2_error (sb, "read_block_bitmap",
|
ext2_error (sb, "read_block_bitmap",
|
"Cannot read block bitmap - "
|
"Cannot read block bitmap - "
|
"block_group = %d, block_bitmap = %lu",
|
"block_group = %d, block_bitmap = %lu",
|
block_group, (unsigned long) gdp->bg_block_bitmap);
|
block_group, (unsigned long) gdp->bg_block_bitmap);
|
retval = -EIO;
|
retval = -EIO;
|
}
|
}
|
/*
|
/*
|
* On IO error, just leave a zero in the superblock's block pointer for
|
* On IO error, just leave a zero in the superblock's block pointer for
|
* this group. The IO will be retried next time.
|
* this group. The IO will be retried next time.
|
*/
|
*/
|
error_out:
|
error_out:
|
sb->u.ext2_sb.s_block_bitmap_number[bitmap_nr] = block_group;
|
sb->u.ext2_sb.s_block_bitmap_number[bitmap_nr] = block_group;
|
sb->u.ext2_sb.s_block_bitmap[bitmap_nr] = bh;
|
sb->u.ext2_sb.s_block_bitmap[bitmap_nr] = bh;
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/*
|
/*
|
* load_block_bitmap loads the block bitmap for a blocks group
|
* load_block_bitmap loads the block bitmap for a blocks group
|
*
|
*
|
* It maintains a cache for the last bitmaps loaded. This cache is managed
|
* It maintains a cache for the last bitmaps loaded. This cache is managed
|
* with a LRU algorithm.
|
* with a LRU algorithm.
|
*
|
*
|
* Notes:
|
* Notes:
|
* 1/ There is one cache per mounted file system.
|
* 1/ There is one cache per mounted file system.
|
* 2/ If the file system contains less than EXT2_MAX_GROUP_LOADED groups,
|
* 2/ If the file system contains less than EXT2_MAX_GROUP_LOADED groups,
|
* this function reads the bitmap without maintaining a LRU cache.
|
* this function reads the bitmap without maintaining a LRU cache.
|
*
|
*
|
* Return the slot used to store the bitmap, or a -ve error code.
|
* Return the slot used to store the bitmap, or a -ve error code.
|
*/
|
*/
|
static int __load_block_bitmap (struct super_block * sb,
|
static int __load_block_bitmap (struct super_block * sb,
|
unsigned int block_group)
|
unsigned int block_group)
|
{
|
{
|
int i, j, retval = 0;
|
int i, j, retval = 0;
|
unsigned long block_bitmap_number;
|
unsigned long block_bitmap_number;
|
struct buffer_head * block_bitmap;
|
struct buffer_head * block_bitmap;
|
|
|
if (block_group >= sb->u.ext2_sb.s_groups_count)
|
if (block_group >= sb->u.ext2_sb.s_groups_count)
|
ext2_panic (sb, "load_block_bitmap",
|
ext2_panic (sb, "load_block_bitmap",
|
"block_group >= groups_count - "
|
"block_group >= groups_count - "
|
"block_group = %d, groups_count = %lu",
|
"block_group = %d, groups_count = %lu",
|
block_group, sb->u.ext2_sb.s_groups_count);
|
block_group, sb->u.ext2_sb.s_groups_count);
|
|
|
if (sb->u.ext2_sb.s_groups_count <= EXT2_MAX_GROUP_LOADED) {
|
if (sb->u.ext2_sb.s_groups_count <= EXT2_MAX_GROUP_LOADED) {
|
if (sb->u.ext2_sb.s_block_bitmap[block_group]) {
|
if (sb->u.ext2_sb.s_block_bitmap[block_group]) {
|
if (sb->u.ext2_sb.s_block_bitmap_number[block_group] ==
|
if (sb->u.ext2_sb.s_block_bitmap_number[block_group] ==
|
block_group)
|
block_group)
|
return block_group;
|
return block_group;
|
ext2_error (sb, "__load_block_bitmap",
|
ext2_error (sb, "__load_block_bitmap",
|
"block_group != block_bitmap_number");
|
"block_group != block_bitmap_number");
|
}
|
}
|
retval = read_block_bitmap (sb, block_group, block_group);
|
retval = read_block_bitmap (sb, block_group, block_group);
|
if (retval < 0)
|
if (retval < 0)
|
return retval;
|
return retval;
|
return block_group;
|
return block_group;
|
}
|
}
|
|
|
for (i = 0; i < sb->u.ext2_sb.s_loaded_block_bitmaps &&
|
for (i = 0; i < sb->u.ext2_sb.s_loaded_block_bitmaps &&
|
sb->u.ext2_sb.s_block_bitmap_number[i] != block_group; i++)
|
sb->u.ext2_sb.s_block_bitmap_number[i] != block_group; i++)
|
;
|
;
|
if (i < sb->u.ext2_sb.s_loaded_block_bitmaps &&
|
if (i < sb->u.ext2_sb.s_loaded_block_bitmaps &&
|
sb->u.ext2_sb.s_block_bitmap_number[i] == block_group) {
|
sb->u.ext2_sb.s_block_bitmap_number[i] == block_group) {
|
block_bitmap_number = sb->u.ext2_sb.s_block_bitmap_number[i];
|
block_bitmap_number = sb->u.ext2_sb.s_block_bitmap_number[i];
|
block_bitmap = sb->u.ext2_sb.s_block_bitmap[i];
|
block_bitmap = sb->u.ext2_sb.s_block_bitmap[i];
|
for (j = i; j > 0; j--) {
|
for (j = i; j > 0; j--) {
|
sb->u.ext2_sb.s_block_bitmap_number[j] =
|
sb->u.ext2_sb.s_block_bitmap_number[j] =
|
sb->u.ext2_sb.s_block_bitmap_number[j - 1];
|
sb->u.ext2_sb.s_block_bitmap_number[j - 1];
|
sb->u.ext2_sb.s_block_bitmap[j] =
|
sb->u.ext2_sb.s_block_bitmap[j] =
|
sb->u.ext2_sb.s_block_bitmap[j - 1];
|
sb->u.ext2_sb.s_block_bitmap[j - 1];
|
}
|
}
|
sb->u.ext2_sb.s_block_bitmap_number[0] = block_bitmap_number;
|
sb->u.ext2_sb.s_block_bitmap_number[0] = block_bitmap_number;
|
sb->u.ext2_sb.s_block_bitmap[0] = block_bitmap;
|
sb->u.ext2_sb.s_block_bitmap[0] = block_bitmap;
|
|
|
/*
|
/*
|
* There's still one special case here --- if block_bitmap == 0
|
* There's still one special case here --- if block_bitmap == 0
|
* then our last attempt to read the bitmap failed and we have
|
* then our last attempt to read the bitmap failed and we have
|
* just ended up caching that failure. Try again to read it.
|
* just ended up caching that failure. Try again to read it.
|
*/
|
*/
|
if (!block_bitmap)
|
if (!block_bitmap)
|
retval = read_block_bitmap (sb, block_group, 0);
|
retval = read_block_bitmap (sb, block_group, 0);
|
} else {
|
} else {
|
if (sb->u.ext2_sb.s_loaded_block_bitmaps < EXT2_MAX_GROUP_LOADED)
|
if (sb->u.ext2_sb.s_loaded_block_bitmaps < EXT2_MAX_GROUP_LOADED)
|
sb->u.ext2_sb.s_loaded_block_bitmaps++;
|
sb->u.ext2_sb.s_loaded_block_bitmaps++;
|
else
|
else
|
brelse (sb->u.ext2_sb.s_block_bitmap[EXT2_MAX_GROUP_LOADED - 1]);
|
brelse (sb->u.ext2_sb.s_block_bitmap[EXT2_MAX_GROUP_LOADED - 1]);
|
for (j = sb->u.ext2_sb.s_loaded_block_bitmaps - 1; j > 0; j--) {
|
for (j = sb->u.ext2_sb.s_loaded_block_bitmaps - 1; j > 0; j--) {
|
sb->u.ext2_sb.s_block_bitmap_number[j] =
|
sb->u.ext2_sb.s_block_bitmap_number[j] =
|
sb->u.ext2_sb.s_block_bitmap_number[j - 1];
|
sb->u.ext2_sb.s_block_bitmap_number[j - 1];
|
sb->u.ext2_sb.s_block_bitmap[j] =
|
sb->u.ext2_sb.s_block_bitmap[j] =
|
sb->u.ext2_sb.s_block_bitmap[j - 1];
|
sb->u.ext2_sb.s_block_bitmap[j - 1];
|
}
|
}
|
retval = read_block_bitmap (sb, block_group, 0);
|
retval = read_block_bitmap (sb, block_group, 0);
|
}
|
}
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/*
|
/*
|
* Load the block bitmap for a given block group. First of all do a couple
|
* Load the block bitmap for a given block group. First of all do a couple
|
* of fast lookups for common cases and then pass the request onto the guts
|
* of fast lookups for common cases and then pass the request onto the guts
|
* of the bitmap loader.
|
* of the bitmap loader.
|
*
|
*
|
* Return the slot number of the group in the superblock bitmap cache's on
|
* Return the slot number of the group in the superblock bitmap cache's on
|
* success, or a -ve error code.
|
* success, or a -ve error code.
|
*
|
*
|
* There is still one inconsistency here --- if the number of groups in this
|
* There is still one inconsistency here --- if the number of groups in this
|
* filesystems is <= EXT2_MAX_GROUP_LOADED, then we have no way of
|
* filesystems is <= EXT2_MAX_GROUP_LOADED, then we have no way of
|
* differentiating between a group for which we have never performed a bitmap
|
* differentiating between a group for which we have never performed a bitmap
|
* IO request, and a group for which the last bitmap read request failed.
|
* IO request, and a group for which the last bitmap read request failed.
|
*/
|
*/
|
static inline int load_block_bitmap (struct super_block * sb,
|
static inline int load_block_bitmap (struct super_block * sb,
|
unsigned int block_group)
|
unsigned int block_group)
|
{
|
{
|
int slot;
|
int slot;
|
|
|
/*
|
/*
|
* Do the lookup for the slot. First of all, check if we're asking
|
* Do the lookup for the slot. First of all, check if we're asking
|
* for the same slot as last time, and did we succeed that last time?
|
* for the same slot as last time, and did we succeed that last time?
|
*/
|
*/
|
if (sb->u.ext2_sb.s_loaded_block_bitmaps > 0 &&
|
if (sb->u.ext2_sb.s_loaded_block_bitmaps > 0 &&
|
sb->u.ext2_sb.s_block_bitmap_number[0] == block_group &&
|
sb->u.ext2_sb.s_block_bitmap_number[0] == block_group &&
|
sb->u.ext2_sb.s_block_bitmap[0]) {
|
sb->u.ext2_sb.s_block_bitmap[0]) {
|
return 0;
|
return 0;
|
}
|
}
|
/*
|
/*
|
* Or can we do a fast lookup based on a loaded group on a filesystem
|
* Or can we do a fast lookup based on a loaded group on a filesystem
|
* small enough to be mapped directly into the superblock?
|
* small enough to be mapped directly into the superblock?
|
*/
|
*/
|
else if (sb->u.ext2_sb.s_groups_count <= EXT2_MAX_GROUP_LOADED &&
|
else if (sb->u.ext2_sb.s_groups_count <= EXT2_MAX_GROUP_LOADED &&
|
sb->u.ext2_sb.s_block_bitmap_number[block_group] == block_group &&
|
sb->u.ext2_sb.s_block_bitmap_number[block_group] == block_group &&
|
sb->u.ext2_sb.s_block_bitmap[block_group]) {
|
sb->u.ext2_sb.s_block_bitmap[block_group]) {
|
slot = block_group;
|
slot = block_group;
|
}
|
}
|
/*
|
/*
|
* If not, then do a full lookup for this block group.
|
* If not, then do a full lookup for this block group.
|
*/
|
*/
|
else {
|
else {
|
slot = __load_block_bitmap (sb, block_group);
|
slot = __load_block_bitmap (sb, block_group);
|
}
|
}
|
|
|
/*
|
/*
|
* <0 means we just got an error
|
* <0 means we just got an error
|
*/
|
*/
|
if (slot < 0)
|
if (slot < 0)
|
return slot;
|
return slot;
|
|
|
/*
|
/*
|
* If it's a valid slot, we may still have cached a previous IO error,
|
* If it's a valid slot, we may still have cached a previous IO error,
|
* in which case the bh in the superblock cache will be zero.
|
* in which case the bh in the superblock cache will be zero.
|
*/
|
*/
|
if (!sb->u.ext2_sb.s_block_bitmap[slot])
|
if (!sb->u.ext2_sb.s_block_bitmap[slot])
|
return -EIO;
|
return -EIO;
|
|
|
/*
|
/*
|
* Must have been read in OK to get this far.
|
* Must have been read in OK to get this far.
|
*/
|
*/
|
return slot;
|
return slot;
|
}
|
}
|
|
|
/* Free given blocks, update quota and i_blocks field */
|
/* Free given blocks, update quota and i_blocks field */
|
void ext2_free_blocks (struct inode * inode, unsigned long block,
|
void ext2_free_blocks (struct inode * inode, unsigned long block,
|
unsigned long count)
|
unsigned long count)
|
{
|
{
|
struct buffer_head * bh;
|
struct buffer_head * bh;
|
struct buffer_head * bh2;
|
struct buffer_head * bh2;
|
unsigned long block_group;
|
unsigned long block_group;
|
unsigned long bit;
|
unsigned long bit;
|
unsigned long i;
|
unsigned long i;
|
int bitmap_nr;
|
int bitmap_nr;
|
unsigned long overflow;
|
unsigned long overflow;
|
struct super_block * sb;
|
struct super_block * sb;
|
struct ext2_group_desc * gdp;
|
struct ext2_group_desc * gdp;
|
struct ext2_super_block * es;
|
struct ext2_super_block * es;
|
|
|
sb = inode->i_sb;
|
sb = inode->i_sb;
|
if (!sb) {
|
if (!sb) {
|
printk ("ext2_free_blocks: nonexistent device");
|
printk ("ext2_free_blocks: nonexistent device");
|
return;
|
return;
|
}
|
}
|
lock_super (sb);
|
lock_super (sb);
|
es = sb->u.ext2_sb.s_es;
|
es = sb->u.ext2_sb.s_es;
|
if (block < le32_to_cpu(es->s_first_data_block) ||
|
if (block < le32_to_cpu(es->s_first_data_block) ||
|
block + count < block ||
|
block + count < block ||
|
(block + count) > le32_to_cpu(es->s_blocks_count)) {
|
(block + count) > le32_to_cpu(es->s_blocks_count)) {
|
ext2_error (sb, "ext2_free_blocks",
|
ext2_error (sb, "ext2_free_blocks",
|
"Freeing blocks not in datazone - "
|
"Freeing blocks not in datazone - "
|
"block = %lu, count = %lu", block, count);
|
"block = %lu, count = %lu", block, count);
|
goto error_return;
|
goto error_return;
|
}
|
}
|
|
|
ext2_debug ("freeing block(s) %lu-%lu\n", block, block + count - 1);
|
ext2_debug ("freeing block(s) %lu-%lu\n", block, block + count - 1);
|
|
|
do_more:
|
do_more:
|
overflow = 0;
|
overflow = 0;
|
block_group = (block - le32_to_cpu(es->s_first_data_block)) /
|
block_group = (block - le32_to_cpu(es->s_first_data_block)) /
|
EXT2_BLOCKS_PER_GROUP(sb);
|
EXT2_BLOCKS_PER_GROUP(sb);
|
bit = (block - le32_to_cpu(es->s_first_data_block)) %
|
bit = (block - le32_to_cpu(es->s_first_data_block)) %
|
EXT2_BLOCKS_PER_GROUP(sb);
|
EXT2_BLOCKS_PER_GROUP(sb);
|
/*
|
/*
|
* Check to see if we are freeing blocks across a group
|
* Check to see if we are freeing blocks across a group
|
* boundary.
|
* boundary.
|
*/
|
*/
|
if (bit + count > EXT2_BLOCKS_PER_GROUP(sb)) {
|
if (bit + count > EXT2_BLOCKS_PER_GROUP(sb)) {
|
overflow = bit + count - EXT2_BLOCKS_PER_GROUP(sb);
|
overflow = bit + count - EXT2_BLOCKS_PER_GROUP(sb);
|
count -= overflow;
|
count -= overflow;
|
}
|
}
|
bitmap_nr = load_block_bitmap (sb, block_group);
|
bitmap_nr = load_block_bitmap (sb, block_group);
|
if (bitmap_nr < 0)
|
if (bitmap_nr < 0)
|
goto error_return;
|
goto error_return;
|
|
|
bh = sb->u.ext2_sb.s_block_bitmap[bitmap_nr];
|
bh = sb->u.ext2_sb.s_block_bitmap[bitmap_nr];
|
gdp = ext2_get_group_desc (sb, block_group, &bh2);
|
gdp = ext2_get_group_desc (sb, block_group, &bh2);
|
if (!gdp)
|
if (!gdp)
|
goto error_return;
|
goto error_return;
|
|
|
for (i = 0; i < count; i++, block++) {
|
for (i = 0; i < count; i++, block++) {
|
if (block == le32_to_cpu(gdp->bg_block_bitmap) ||
|
if (block == le32_to_cpu(gdp->bg_block_bitmap) ||
|
block == le32_to_cpu(gdp->bg_inode_bitmap) ||
|
block == le32_to_cpu(gdp->bg_inode_bitmap) ||
|
in_range(block, le32_to_cpu(gdp->bg_inode_table),
|
in_range(block, le32_to_cpu(gdp->bg_inode_table),
|
EXT2_SB(sb)->s_itb_per_group)) {
|
EXT2_SB(sb)->s_itb_per_group)) {
|
ext2_error(sb, __FUNCTION__,
|
ext2_error(sb, __FUNCTION__,
|
"Freeing block in system zone - block = %lu",
|
"Freeing block in system zone - block = %lu",
|
block);
|
block);
|
continue;
|
continue;
|
}
|
}
|
|
|
if (!ext2_clear_bit (bit + i, bh->b_data))
|
if (!ext2_clear_bit (bit + i, bh->b_data))
|
ext2_error(sb, __FUNCTION__,
|
ext2_error(sb, __FUNCTION__,
|
"bit already cleared for block %lu", block);
|
"bit already cleared for block %lu", block);
|
else {
|
else {
|
DQUOT_FREE_BLOCK(inode, 1);
|
DQUOT_FREE_BLOCK(inode, 1);
|
gdp->bg_free_blocks_count =
|
gdp->bg_free_blocks_count =
|
cpu_to_le16(le16_to_cpu(gdp->bg_free_blocks_count)+1);
|
cpu_to_le16(le16_to_cpu(gdp->bg_free_blocks_count)+1);
|
es->s_free_blocks_count =
|
es->s_free_blocks_count =
|
cpu_to_le32(le32_to_cpu(es->s_free_blocks_count)+1);
|
cpu_to_le32(le32_to_cpu(es->s_free_blocks_count)+1);
|
}
|
}
|
}
|
}
|
|
|
mark_buffer_dirty(bh2);
|
mark_buffer_dirty(bh2);
|
mark_buffer_dirty(sb->u.ext2_sb.s_sbh);
|
mark_buffer_dirty(sb->u.ext2_sb.s_sbh);
|
|
|
mark_buffer_dirty(bh);
|
mark_buffer_dirty(bh);
|
if (sb->s_flags & MS_SYNCHRONOUS) {
|
if (sb->s_flags & MS_SYNCHRONOUS) {
|
ll_rw_block (WRITE, 1, &bh);
|
ll_rw_block (WRITE, 1, &bh);
|
wait_on_buffer (bh);
|
wait_on_buffer (bh);
|
}
|
}
|
if (overflow) {
|
if (overflow) {
|
count = overflow;
|
count = overflow;
|
goto do_more;
|
goto do_more;
|
}
|
}
|
sb->s_dirt = 1;
|
sb->s_dirt = 1;
|
error_return:
|
error_return:
|
unlock_super (sb);
|
unlock_super (sb);
|
return;
|
return;
|
}
|
}
|
|
|
/*
|
/*
|
* ext2_new_block uses a goal block to assist allocation. If the goal is
|
* ext2_new_block uses a goal block to assist allocation. If the goal is
|
* free, or there is a free block within 32 blocks of the goal, that block
|
* free, or there is a free block within 32 blocks of the goal, that block
|
* is allocated. Otherwise a forward search is made for a free block; within
|
* is allocated. Otherwise a forward search is made for a free block; within
|
* each block group the search first looks for an entire free byte in the block
|
* each block group the search first looks for an entire free byte in the block
|
* bitmap, and then for any free bit if that fails.
|
* bitmap, and then for any free bit if that fails.
|
* This function also updates quota and i_blocks field.
|
* This function also updates quota and i_blocks field.
|
*/
|
*/
|
int ext2_new_block (struct inode * inode, unsigned long goal,
|
int ext2_new_block (struct inode * inode, unsigned long goal,
|
u32 * prealloc_count, u32 * prealloc_block, int * err)
|
u32 * prealloc_count, u32 * prealloc_block, int * err)
|
{
|
{
|
struct buffer_head * bh;
|
struct buffer_head * bh;
|
struct buffer_head * bh2;
|
struct buffer_head * bh2;
|
char * p, * r;
|
char * p, * r;
|
int i, j, k, tmp;
|
int i, j, k, tmp;
|
int bitmap_nr;
|
int bitmap_nr;
|
struct super_block * sb;
|
struct super_block * sb;
|
struct ext2_group_desc * gdp;
|
struct ext2_group_desc * gdp;
|
struct ext2_super_block * es;
|
struct ext2_super_block * es;
|
#ifdef EXT2FS_DEBUG
|
#ifdef EXT2FS_DEBUG
|
static int goal_hits = 0, goal_attempts = 0;
|
static int goal_hits = 0, goal_attempts = 0;
|
#endif
|
#endif
|
*err = -ENOSPC;
|
*err = -ENOSPC;
|
sb = inode->i_sb;
|
sb = inode->i_sb;
|
if (!sb) {
|
if (!sb) {
|
printk ("ext2_new_block: nonexistent device");
|
printk ("ext2_new_block: nonexistent device");
|
return 0;
|
return 0;
|
}
|
}
|
|
|
lock_super (sb);
|
lock_super (sb);
|
es = sb->u.ext2_sb.s_es;
|
es = sb->u.ext2_sb.s_es;
|
if (le32_to_cpu(es->s_free_blocks_count) <= le32_to_cpu(es->s_r_blocks_count) &&
|
if (le32_to_cpu(es->s_free_blocks_count) <= le32_to_cpu(es->s_r_blocks_count) &&
|
((sb->u.ext2_sb.s_resuid != current->fsuid) &&
|
((sb->u.ext2_sb.s_resuid != current->fsuid) &&
|
(sb->u.ext2_sb.s_resgid == 0 ||
|
(sb->u.ext2_sb.s_resgid == 0 ||
|
!in_group_p (sb->u.ext2_sb.s_resgid)) &&
|
!in_group_p (sb->u.ext2_sb.s_resgid)) &&
|
!capable(CAP_SYS_RESOURCE)))
|
!capable(CAP_SYS_RESOURCE)))
|
goto out;
|
goto out;
|
|
|
ext2_debug ("goal=%lu.\n", goal);
|
ext2_debug ("goal=%lu.\n", goal);
|
|
|
repeat:
|
repeat:
|
/*
|
/*
|
* First, test whether the goal block is free.
|
* First, test whether the goal block is free.
|
*/
|
*/
|
if (goal < le32_to_cpu(es->s_first_data_block) ||
|
if (goal < le32_to_cpu(es->s_first_data_block) ||
|
goal >= le32_to_cpu(es->s_blocks_count))
|
goal >= le32_to_cpu(es->s_blocks_count))
|
goal = le32_to_cpu(es->s_first_data_block);
|
goal = le32_to_cpu(es->s_first_data_block);
|
i = (goal - le32_to_cpu(es->s_first_data_block)) / EXT2_BLOCKS_PER_GROUP(sb);
|
i = (goal - le32_to_cpu(es->s_first_data_block)) / EXT2_BLOCKS_PER_GROUP(sb);
|
gdp = ext2_get_group_desc (sb, i, &bh2);
|
gdp = ext2_get_group_desc (sb, i, &bh2);
|
if (!gdp)
|
if (!gdp)
|
goto io_error;
|
goto io_error;
|
|
|
if (le16_to_cpu(gdp->bg_free_blocks_count) > 0) {
|
if (le16_to_cpu(gdp->bg_free_blocks_count) > 0) {
|
j = ((goal - le32_to_cpu(es->s_first_data_block)) % EXT2_BLOCKS_PER_GROUP(sb));
|
j = ((goal - le32_to_cpu(es->s_first_data_block)) % EXT2_BLOCKS_PER_GROUP(sb));
|
#ifdef EXT2FS_DEBUG
|
#ifdef EXT2FS_DEBUG
|
if (j)
|
if (j)
|
goal_attempts++;
|
goal_attempts++;
|
#endif
|
#endif
|
bitmap_nr = load_block_bitmap (sb, i);
|
bitmap_nr = load_block_bitmap (sb, i);
|
if (bitmap_nr < 0)
|
if (bitmap_nr < 0)
|
goto io_error;
|
goto io_error;
|
|
|
bh = sb->u.ext2_sb.s_block_bitmap[bitmap_nr];
|
bh = sb->u.ext2_sb.s_block_bitmap[bitmap_nr];
|
|
|
ext2_debug ("goal is at %d:%d.\n", i, j);
|
ext2_debug ("goal is at %d:%d.\n", i, j);
|
|
|
if (!ext2_test_bit(j, bh->b_data)) {
|
if (!ext2_test_bit(j, bh->b_data)) {
|
ext2_debug("goal bit allocated, %d hits\n",++goal_hits);
|
ext2_debug("goal bit allocated, %d hits\n",++goal_hits);
|
goto got_block;
|
goto got_block;
|
}
|
}
|
if (j) {
|
if (j) {
|
/*
|
/*
|
* The goal was occupied; search forward for a free
|
* The goal was occupied; search forward for a free
|
* block within the next XX blocks.
|
* block within the next XX blocks.
|
*
|
*
|
* end_goal is more or less random, but it has to be
|
* end_goal is more or less random, but it has to be
|
* less than EXT2_BLOCKS_PER_GROUP. Aligning up to the
|
* less than EXT2_BLOCKS_PER_GROUP. Aligning up to the
|
* next 64-bit boundary is simple..
|
* next 64-bit boundary is simple..
|
*/
|
*/
|
int end_goal = (j + 63) & ~63;
|
int end_goal = (j + 63) & ~63;
|
j = ext2_find_next_zero_bit(bh->b_data, end_goal, j);
|
j = ext2_find_next_zero_bit(bh->b_data, end_goal, j);
|
if (j < end_goal)
|
if (j < end_goal)
|
goto got_block;
|
goto got_block;
|
}
|
}
|
|
|
ext2_debug ("Bit not found near goal\n");
|
ext2_debug ("Bit not found near goal\n");
|
|
|
/*
|
/*
|
* There has been no free block found in the near vicinity
|
* There has been no free block found in the near vicinity
|
* of the goal: do a search forward through the block groups,
|
* of the goal: do a search forward through the block groups,
|
* searching in each group first for an entire free byte in
|
* searching in each group first for an entire free byte in
|
* the bitmap and then for any free bit.
|
* the bitmap and then for any free bit.
|
*
|
*
|
* Search first in the remainder of the current group; then,
|
* Search first in the remainder of the current group; then,
|
* cyclicly search through the rest of the groups.
|
* cyclicly search through the rest of the groups.
|
*/
|
*/
|
p = ((char *) bh->b_data) + (j >> 3);
|
p = ((char *) bh->b_data) + (j >> 3);
|
r = memscan(p, 0, (EXT2_BLOCKS_PER_GROUP(sb) - j + 7) >> 3);
|
r = memscan(p, 0, (EXT2_BLOCKS_PER_GROUP(sb) - j + 7) >> 3);
|
k = (r - ((char *) bh->b_data)) << 3;
|
k = (r - ((char *) bh->b_data)) << 3;
|
if (k < EXT2_BLOCKS_PER_GROUP(sb)) {
|
if (k < EXT2_BLOCKS_PER_GROUP(sb)) {
|
j = k;
|
j = k;
|
goto search_back;
|
goto search_back;
|
}
|
}
|
|
|
k = ext2_find_next_zero_bit ((unsigned long *) bh->b_data,
|
k = ext2_find_next_zero_bit ((unsigned long *) bh->b_data,
|
EXT2_BLOCKS_PER_GROUP(sb),
|
EXT2_BLOCKS_PER_GROUP(sb),
|
j);
|
j);
|
if (k < EXT2_BLOCKS_PER_GROUP(sb)) {
|
if (k < EXT2_BLOCKS_PER_GROUP(sb)) {
|
j = k;
|
j = k;
|
goto got_block;
|
goto got_block;
|
}
|
}
|
}
|
}
|
|
|
ext2_debug ("Bit not found in block group %d.\n", i);
|
ext2_debug ("Bit not found in block group %d.\n", i);
|
|
|
/*
|
/*
|
* Now search the rest of the groups. We assume that
|
* Now search the rest of the groups. We assume that
|
* i and gdp correctly point to the last group visited.
|
* i and gdp correctly point to the last group visited.
|
*/
|
*/
|
for (k = 0; k < sb->u.ext2_sb.s_groups_count; k++) {
|
for (k = 0; k < sb->u.ext2_sb.s_groups_count; k++) {
|
i++;
|
i++;
|
if (i >= sb->u.ext2_sb.s_groups_count)
|
if (i >= sb->u.ext2_sb.s_groups_count)
|
i = 0;
|
i = 0;
|
gdp = ext2_get_group_desc (sb, i, &bh2);
|
gdp = ext2_get_group_desc (sb, i, &bh2);
|
if (!gdp)
|
if (!gdp)
|
goto io_error;
|
goto io_error;
|
if (le16_to_cpu(gdp->bg_free_blocks_count) > 0)
|
if (le16_to_cpu(gdp->bg_free_blocks_count) > 0)
|
break;
|
break;
|
}
|
}
|
if (k >= sb->u.ext2_sb.s_groups_count)
|
if (k >= sb->u.ext2_sb.s_groups_count)
|
goto out;
|
goto out;
|
bitmap_nr = load_block_bitmap (sb, i);
|
bitmap_nr = load_block_bitmap (sb, i);
|
if (bitmap_nr < 0)
|
if (bitmap_nr < 0)
|
goto io_error;
|
goto io_error;
|
|
|
bh = sb->u.ext2_sb.s_block_bitmap[bitmap_nr];
|
bh = sb->u.ext2_sb.s_block_bitmap[bitmap_nr];
|
r = memscan(bh->b_data, 0, EXT2_BLOCKS_PER_GROUP(sb) >> 3);
|
r = memscan(bh->b_data, 0, EXT2_BLOCKS_PER_GROUP(sb) >> 3);
|
j = (r - bh->b_data) << 3;
|
j = (r - bh->b_data) << 3;
|
if (j < EXT2_BLOCKS_PER_GROUP(sb))
|
if (j < EXT2_BLOCKS_PER_GROUP(sb))
|
goto search_back;
|
goto search_back;
|
else
|
else
|
j = ext2_find_first_zero_bit ((unsigned long *) bh->b_data,
|
j = ext2_find_first_zero_bit ((unsigned long *) bh->b_data,
|
EXT2_BLOCKS_PER_GROUP(sb));
|
EXT2_BLOCKS_PER_GROUP(sb));
|
if (j >= EXT2_BLOCKS_PER_GROUP(sb)) {
|
if (j >= EXT2_BLOCKS_PER_GROUP(sb)) {
|
ext2_error (sb, "ext2_new_block",
|
ext2_error (sb, "ext2_new_block",
|
"Free blocks count corrupted for block group %d", i);
|
"Free blocks count corrupted for block group %d", i);
|
goto out;
|
goto out;
|
}
|
}
|
|
|
search_back:
|
search_back:
|
/*
|
/*
|
* We have succeeded in finding a free byte in the block
|
* We have succeeded in finding a free byte in the block
|
* bitmap. Now search backwards up to 7 bits to find the
|
* bitmap. Now search backwards up to 7 bits to find the
|
* start of this group of free blocks.
|
* start of this group of free blocks.
|
*/
|
*/
|
for (k = 0; k < 7 && j > 0 && !ext2_test_bit (j - 1, bh->b_data); k++, j--);
|
for (k = 0; k < 7 && j > 0 && !ext2_test_bit (j - 1, bh->b_data); k++, j--);
|
|
|
got_block:
|
got_block:
|
|
|
ext2_debug ("using block group %d(%d)\n", i, gdp->bg_free_blocks_count);
|
ext2_debug ("using block group %d(%d)\n", i, gdp->bg_free_blocks_count);
|
|
|
/*
|
/*
|
* Check quota for allocation of this block.
|
* Check quota for allocation of this block.
|
*/
|
*/
|
if(DQUOT_ALLOC_BLOCK(inode, 1)) {
|
if(DQUOT_ALLOC_BLOCK(inode, 1)) {
|
*err = -EDQUOT;
|
*err = -EDQUOT;
|
goto out;
|
goto out;
|
}
|
}
|
|
|
tmp = j + i * EXT2_BLOCKS_PER_GROUP(sb) + le32_to_cpu(es->s_first_data_block);
|
tmp = j + i * EXT2_BLOCKS_PER_GROUP(sb) + le32_to_cpu(es->s_first_data_block);
|
|
|
if (tmp == le32_to_cpu(gdp->bg_block_bitmap) ||
|
if (tmp == le32_to_cpu(gdp->bg_block_bitmap) ||
|
tmp == le32_to_cpu(gdp->bg_inode_bitmap) ||
|
tmp == le32_to_cpu(gdp->bg_inode_bitmap) ||
|
in_range (tmp, le32_to_cpu(gdp->bg_inode_table),
|
in_range (tmp, le32_to_cpu(gdp->bg_inode_table),
|
EXT2_SB(sb)->s_itb_per_group)) {
|
EXT2_SB(sb)->s_itb_per_group)) {
|
ext2_error (sb, "ext2_new_block",
|
ext2_error (sb, "ext2_new_block",
|
"Allocating block in system zone - block = %u",
|
"Allocating block in system zone - block = %u",
|
tmp);
|
tmp);
|
ext2_set_bit(j, bh->b_data);
|
ext2_set_bit(j, bh->b_data);
|
DQUOT_FREE_BLOCK(inode, 1);
|
DQUOT_FREE_BLOCK(inode, 1);
|
goto repeat;
|
goto repeat;
|
}
|
}
|
|
|
if (ext2_set_bit (j, bh->b_data)) {
|
if (ext2_set_bit (j, bh->b_data)) {
|
ext2_warning (sb, "ext2_new_block",
|
ext2_warning (sb, "ext2_new_block",
|
"bit already set for block %d", j);
|
"bit already set for block %d", j);
|
DQUOT_FREE_BLOCK(inode, 1);
|
DQUOT_FREE_BLOCK(inode, 1);
|
goto repeat;
|
goto repeat;
|
}
|
}
|
|
|
ext2_debug ("found bit %d\n", j);
|
ext2_debug ("found bit %d\n", j);
|
|
|
/*
|
/*
|
* Do block preallocation now if required.
|
* Do block preallocation now if required.
|
*/
|
*/
|
#ifdef EXT2_PREALLOCATE
|
#ifdef EXT2_PREALLOCATE
|
/* Writer: ->i_prealloc* */
|
/* Writer: ->i_prealloc* */
|
if (prealloc_count && !*prealloc_count) {
|
if (prealloc_count && !*prealloc_count) {
|
int prealloc_goal;
|
int prealloc_goal;
|
unsigned long next_block = tmp + 1;
|
unsigned long next_block = tmp + 1;
|
|
|
prealloc_goal = es->s_prealloc_blocks ?
|
prealloc_goal = es->s_prealloc_blocks ?
|
es->s_prealloc_blocks : EXT2_DEFAULT_PREALLOC_BLOCKS;
|
es->s_prealloc_blocks : EXT2_DEFAULT_PREALLOC_BLOCKS;
|
|
|
*prealloc_block = next_block;
|
*prealloc_block = next_block;
|
/* Writer: end */
|
/* Writer: end */
|
for (k = 1;
|
for (k = 1;
|
k < prealloc_goal && (j + k) < EXT2_BLOCKS_PER_GROUP(sb);
|
k < prealloc_goal && (j + k) < EXT2_BLOCKS_PER_GROUP(sb);
|
k++, next_block++) {
|
k++, next_block++) {
|
if (DQUOT_PREALLOC_BLOCK(inode, 1))
|
if (DQUOT_PREALLOC_BLOCK(inode, 1))
|
break;
|
break;
|
/* Writer: ->i_prealloc* */
|
/* Writer: ->i_prealloc* */
|
if (*prealloc_block + *prealloc_count != next_block ||
|
if (*prealloc_block + *prealloc_count != next_block ||
|
ext2_set_bit (j + k, bh->b_data)) {
|
ext2_set_bit (j + k, bh->b_data)) {
|
/* Writer: end */
|
/* Writer: end */
|
DQUOT_FREE_BLOCK(inode, 1);
|
DQUOT_FREE_BLOCK(inode, 1);
|
break;
|
break;
|
}
|
}
|
(*prealloc_count)++;
|
(*prealloc_count)++;
|
/* Writer: end */
|
/* Writer: end */
|
}
|
}
|
/*
|
/*
|
* As soon as we go for per-group spinlocks we'll need these
|
* As soon as we go for per-group spinlocks we'll need these
|
* done inside the loop above.
|
* done inside the loop above.
|
*/
|
*/
|
gdp->bg_free_blocks_count =
|
gdp->bg_free_blocks_count =
|
cpu_to_le16(le16_to_cpu(gdp->bg_free_blocks_count) -
|
cpu_to_le16(le16_to_cpu(gdp->bg_free_blocks_count) -
|
(k - 1));
|
(k - 1));
|
es->s_free_blocks_count =
|
es->s_free_blocks_count =
|
cpu_to_le32(le32_to_cpu(es->s_free_blocks_count) -
|
cpu_to_le32(le32_to_cpu(es->s_free_blocks_count) -
|
(k - 1));
|
(k - 1));
|
ext2_debug ("Preallocated a further %lu bits.\n",
|
ext2_debug ("Preallocated a further %lu bits.\n",
|
(k - 1));
|
(k - 1));
|
}
|
}
|
#endif
|
#endif
|
|
|
j = tmp;
|
j = tmp;
|
|
|
mark_buffer_dirty(bh);
|
mark_buffer_dirty(bh);
|
if (sb->s_flags & MS_SYNCHRONOUS) {
|
if (sb->s_flags & MS_SYNCHRONOUS) {
|
ll_rw_block (WRITE, 1, &bh);
|
ll_rw_block (WRITE, 1, &bh);
|
wait_on_buffer (bh);
|
wait_on_buffer (bh);
|
}
|
}
|
|
|
if (j >= le32_to_cpu(es->s_blocks_count)) {
|
if (j >= le32_to_cpu(es->s_blocks_count)) {
|
ext2_error (sb, "ext2_new_block",
|
ext2_error (sb, "ext2_new_block",
|
"block(%d) >= blocks count(%d) - "
|
"block(%d) >= blocks count(%d) - "
|
"block_group = %d, es == %p ",j,
|
"block_group = %d, es == %p ",j,
|
le32_to_cpu(es->s_blocks_count), i, es);
|
le32_to_cpu(es->s_blocks_count), i, es);
|
goto out;
|
goto out;
|
}
|
}
|
|
|
ext2_debug ("allocating block %d. "
|
ext2_debug ("allocating block %d. "
|
"Goal hits %d of %d.\n", j, goal_hits, goal_attempts);
|
"Goal hits %d of %d.\n", j, goal_hits, goal_attempts);
|
|
|
gdp->bg_free_blocks_count = cpu_to_le16(le16_to_cpu(gdp->bg_free_blocks_count) - 1);
|
gdp->bg_free_blocks_count = cpu_to_le16(le16_to_cpu(gdp->bg_free_blocks_count) - 1);
|
mark_buffer_dirty(bh2);
|
mark_buffer_dirty(bh2);
|
es->s_free_blocks_count = cpu_to_le32(le32_to_cpu(es->s_free_blocks_count) - 1);
|
es->s_free_blocks_count = cpu_to_le32(le32_to_cpu(es->s_free_blocks_count) - 1);
|
mark_buffer_dirty(sb->u.ext2_sb.s_sbh);
|
mark_buffer_dirty(sb->u.ext2_sb.s_sbh);
|
sb->s_dirt = 1;
|
sb->s_dirt = 1;
|
unlock_super (sb);
|
unlock_super (sb);
|
*err = 0;
|
*err = 0;
|
return j;
|
return j;
|
|
|
io_error:
|
io_error:
|
*err = -EIO;
|
*err = -EIO;
|
out:
|
out:
|
unlock_super (sb);
|
unlock_super (sb);
|
return 0;
|
return 0;
|
|
|
}
|
}
|
|
|
unsigned long ext2_count_free_blocks (struct super_block * sb)
|
unsigned long ext2_count_free_blocks (struct super_block * sb)
|
{
|
{
|
#ifdef EXT2FS_DEBUG
|
#ifdef EXT2FS_DEBUG
|
struct ext2_super_block * es;
|
struct ext2_super_block * es;
|
unsigned long desc_count, bitmap_count, x;
|
unsigned long desc_count, bitmap_count, x;
|
int bitmap_nr;
|
int bitmap_nr;
|
struct ext2_group_desc * gdp;
|
struct ext2_group_desc * gdp;
|
int i;
|
int i;
|
|
|
lock_super (sb);
|
lock_super (sb);
|
es = sb->u.ext2_sb.s_es;
|
es = sb->u.ext2_sb.s_es;
|
desc_count = 0;
|
desc_count = 0;
|
bitmap_count = 0;
|
bitmap_count = 0;
|
gdp = NULL;
|
gdp = NULL;
|
for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
|
for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
|
gdp = ext2_get_group_desc (sb, i, NULL);
|
gdp = ext2_get_group_desc (sb, i, NULL);
|
if (!gdp)
|
if (!gdp)
|
continue;
|
continue;
|
desc_count += le16_to_cpu(gdp->bg_free_blocks_count);
|
desc_count += le16_to_cpu(gdp->bg_free_blocks_count);
|
bitmap_nr = load_block_bitmap (sb, i);
|
bitmap_nr = load_block_bitmap (sb, i);
|
if (bitmap_nr < 0)
|
if (bitmap_nr < 0)
|
continue;
|
continue;
|
|
|
x = ext2_count_free (sb->u.ext2_sb.s_block_bitmap[bitmap_nr],
|
x = ext2_count_free (sb->u.ext2_sb.s_block_bitmap[bitmap_nr],
|
sb->s_blocksize);
|
sb->s_blocksize);
|
printk ("group %d: stored = %d, counted = %lu\n",
|
printk ("group %d: stored = %d, counted = %lu\n",
|
i, le16_to_cpu(gdp->bg_free_blocks_count), x);
|
i, le16_to_cpu(gdp->bg_free_blocks_count), x);
|
bitmap_count += x;
|
bitmap_count += x;
|
}
|
}
|
printk("ext2_count_free_blocks: stored = %lu, computed = %lu, %lu\n",
|
printk("ext2_count_free_blocks: stored = %lu, computed = %lu, %lu\n",
|
le32_to_cpu(es->s_free_blocks_count), desc_count, bitmap_count);
|
le32_to_cpu(es->s_free_blocks_count), desc_count, bitmap_count);
|
unlock_super (sb);
|
unlock_super (sb);
|
return bitmap_count;
|
return bitmap_count;
|
#else
|
#else
|
return le32_to_cpu(sb->u.ext2_sb.s_es->s_free_blocks_count);
|
return le32_to_cpu(sb->u.ext2_sb.s_es->s_free_blocks_count);
|
#endif
|
#endif
|
}
|
}
|
|
|
static inline int block_in_use (unsigned long block,
|
static inline int block_in_use (unsigned long block,
|
struct super_block * sb,
|
struct super_block * sb,
|
unsigned char * map)
|
unsigned char * map)
|
{
|
{
|
return ext2_test_bit ((block - le32_to_cpu(sb->u.ext2_sb.s_es->s_first_data_block)) %
|
return ext2_test_bit ((block - le32_to_cpu(sb->u.ext2_sb.s_es->s_first_data_block)) %
|
EXT2_BLOCKS_PER_GROUP(sb), map);
|
EXT2_BLOCKS_PER_GROUP(sb), map);
|
}
|
}
|
|
|
static inline int test_root(int a, int b)
|
static inline int test_root(int a, int b)
|
{
|
{
|
if (a == 0)
|
if (a == 0)
|
return 1;
|
return 1;
|
while (1) {
|
while (1) {
|
if (a == 1)
|
if (a == 1)
|
return 1;
|
return 1;
|
if (a % b)
|
if (a % b)
|
return 0;
|
return 0;
|
a = a / b;
|
a = a / b;
|
}
|
}
|
}
|
}
|
|
|
int ext2_group_sparse(int group)
|
int ext2_group_sparse(int group)
|
{
|
{
|
return (test_root(group, 3) || test_root(group, 5) ||
|
return (test_root(group, 3) || test_root(group, 5) ||
|
test_root(group, 7));
|
test_root(group, 7));
|
}
|
}
|
|
|
/**
|
/**
|
* ext2_bg_has_super - number of blocks used by the superblock in group
|
* ext2_bg_has_super - number of blocks used by the superblock in group
|
* @sb: superblock for filesystem
|
* @sb: superblock for filesystem
|
* @group: group number to check
|
* @group: group number to check
|
*
|
*
|
* Return the number of blocks used by the superblock (primary or backup)
|
* Return the number of blocks used by the superblock (primary or backup)
|
* in this group. Currently this will be only 0 or 1.
|
* in this group. Currently this will be only 0 or 1.
|
*/
|
*/
|
int ext2_bg_has_super(struct super_block *sb, int group)
|
int ext2_bg_has_super(struct super_block *sb, int group)
|
{
|
{
|
if (EXT2_HAS_RO_COMPAT_FEATURE(sb,EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)&&
|
if (EXT2_HAS_RO_COMPAT_FEATURE(sb,EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)&&
|
!ext2_group_sparse(group))
|
!ext2_group_sparse(group))
|
return 0;
|
return 0;
|
return 1;
|
return 1;
|
}
|
}
|
|
|
/**
|
/**
|
* ext2_bg_num_gdb - number of blocks used by the group table in group
|
* ext2_bg_num_gdb - number of blocks used by the group table in group
|
* @sb: superblock for filesystem
|
* @sb: superblock for filesystem
|
* @group: group number to check
|
* @group: group number to check
|
*
|
*
|
* Return the number of blocks used by the group descriptor table
|
* Return the number of blocks used by the group descriptor table
|
* (primary or backup) in this group. In the future there may be a
|
* (primary or backup) in this group. In the future there may be a
|
* different number of descriptor blocks in each group.
|
* different number of descriptor blocks in each group.
|
*/
|
*/
|
unsigned long ext2_bg_num_gdb(struct super_block *sb, int group)
|
unsigned long ext2_bg_num_gdb(struct super_block *sb, int group)
|
{
|
{
|
if (EXT2_HAS_RO_COMPAT_FEATURE(sb,EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)&&
|
if (EXT2_HAS_RO_COMPAT_FEATURE(sb,EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)&&
|
!ext2_group_sparse(group))
|
!ext2_group_sparse(group))
|
return 0;
|
return 0;
|
return EXT2_SB(sb)->s_gdb_count;
|
return EXT2_SB(sb)->s_gdb_count;
|
}
|
}
|
|
|
#ifdef CONFIG_EXT2_CHECK
|
#ifdef CONFIG_EXT2_CHECK
|
/* Called at mount-time, super-block is locked */
|
/* Called at mount-time, super-block is locked */
|
void ext2_check_blocks_bitmap (struct super_block * sb)
|
void ext2_check_blocks_bitmap (struct super_block * sb)
|
{
|
{
|
struct buffer_head * bh;
|
struct buffer_head * bh;
|
struct ext2_super_block * es;
|
struct ext2_super_block * es;
|
unsigned long desc_count, bitmap_count, x, j;
|
unsigned long desc_count, bitmap_count, x, j;
|
unsigned long desc_blocks;
|
unsigned long desc_blocks;
|
int bitmap_nr;
|
int bitmap_nr;
|
struct ext2_group_desc * gdp;
|
struct ext2_group_desc * gdp;
|
int i;
|
int i;
|
|
|
es = sb->u.ext2_sb.s_es;
|
es = sb->u.ext2_sb.s_es;
|
desc_count = 0;
|
desc_count = 0;
|
bitmap_count = 0;
|
bitmap_count = 0;
|
gdp = NULL;
|
gdp = NULL;
|
for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
|
for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
|
gdp = ext2_get_group_desc (sb, i, NULL);
|
gdp = ext2_get_group_desc (sb, i, NULL);
|
if (!gdp)
|
if (!gdp)
|
continue;
|
continue;
|
desc_count += le16_to_cpu(gdp->bg_free_blocks_count);
|
desc_count += le16_to_cpu(gdp->bg_free_blocks_count);
|
bitmap_nr = load_block_bitmap (sb, i);
|
bitmap_nr = load_block_bitmap (sb, i);
|
if (bitmap_nr < 0)
|
if (bitmap_nr < 0)
|
continue;
|
continue;
|
|
|
bh = EXT2_SB(sb)->s_block_bitmap[bitmap_nr];
|
bh = EXT2_SB(sb)->s_block_bitmap[bitmap_nr];
|
|
|
if (ext2_bg_has_super(sb, i) && !ext2_test_bit(0, bh->b_data))
|
if (ext2_bg_has_super(sb, i) && !ext2_test_bit(0, bh->b_data))
|
ext2_error(sb, __FUNCTION__,
|
ext2_error(sb, __FUNCTION__,
|
"Superblock in group %d is marked free", i);
|
"Superblock in group %d is marked free", i);
|
|
|
desc_blocks = ext2_bg_num_gdb(sb, i);
|
desc_blocks = ext2_bg_num_gdb(sb, i);
|
for (j = 0; j < desc_blocks; j++)
|
for (j = 0; j < desc_blocks; j++)
|
if (!ext2_test_bit(j + 1, bh->b_data))
|
if (!ext2_test_bit(j + 1, bh->b_data))
|
ext2_error(sb, __FUNCTION__,
|
ext2_error(sb, __FUNCTION__,
|
"Descriptor block #%ld in group "
|
"Descriptor block #%ld in group "
|
"%d is marked free", j, i);
|
"%d is marked free", j, i);
|
|
|
if (!block_in_use (le32_to_cpu(gdp->bg_block_bitmap), sb, bh->b_data))
|
if (!block_in_use (le32_to_cpu(gdp->bg_block_bitmap), sb, bh->b_data))
|
ext2_error (sb, "ext2_check_blocks_bitmap",
|
ext2_error (sb, "ext2_check_blocks_bitmap",
|
"Block bitmap for group %d is marked free",
|
"Block bitmap for group %d is marked free",
|
i);
|
i);
|
|
|
if (!block_in_use (le32_to_cpu(gdp->bg_inode_bitmap), sb, bh->b_data))
|
if (!block_in_use (le32_to_cpu(gdp->bg_inode_bitmap), sb, bh->b_data))
|
ext2_error (sb, "ext2_check_blocks_bitmap",
|
ext2_error (sb, "ext2_check_blocks_bitmap",
|
"Inode bitmap for group %d is marked free",
|
"Inode bitmap for group %d is marked free",
|
i);
|
i);
|
|
|
for (j = 0; j < sb->u.ext2_sb.s_itb_per_group; j++)
|
for (j = 0; j < sb->u.ext2_sb.s_itb_per_group; j++)
|
if (!block_in_use (le32_to_cpu(gdp->bg_inode_table) + j, sb, bh->b_data))
|
if (!block_in_use (le32_to_cpu(gdp->bg_inode_table) + j, sb, bh->b_data))
|
ext2_error (sb, "ext2_check_blocks_bitmap",
|
ext2_error (sb, "ext2_check_blocks_bitmap",
|
"Block #%ld of the inode table in "
|
"Block #%ld of the inode table in "
|
"group %d is marked free", j, i);
|
"group %d is marked free", j, i);
|
|
|
x = ext2_count_free (bh, sb->s_blocksize);
|
x = ext2_count_free (bh, sb->s_blocksize);
|
if (le16_to_cpu(gdp->bg_free_blocks_count) != x)
|
if (le16_to_cpu(gdp->bg_free_blocks_count) != x)
|
ext2_error (sb, "ext2_check_blocks_bitmap",
|
ext2_error (sb, "ext2_check_blocks_bitmap",
|
"Wrong free blocks count for group %d, "
|
"Wrong free blocks count for group %d, "
|
"stored = %d, counted = %lu", i,
|
"stored = %d, counted = %lu", i,
|
le16_to_cpu(gdp->bg_free_blocks_count), x);
|
le16_to_cpu(gdp->bg_free_blocks_count), x);
|
bitmap_count += x;
|
bitmap_count += x;
|
}
|
}
|
if (le32_to_cpu(es->s_free_blocks_count) != bitmap_count)
|
if (le32_to_cpu(es->s_free_blocks_count) != bitmap_count)
|
ext2_error (sb, "ext2_check_blocks_bitmap",
|
ext2_error (sb, "ext2_check_blocks_bitmap",
|
"Wrong free blocks count in super block, "
|
"Wrong free blocks count in super block, "
|
"stored = %lu, counted = %lu",
|
"stored = %lu, counted = %lu",
|
(unsigned long) le32_to_cpu(es->s_free_blocks_count), bitmap_count);
|
(unsigned long) le32_to_cpu(es->s_free_blocks_count), bitmap_count);
|
}
|
}
|
#endif
|
#endif
|
|
|
