/*
|
/*
|
* linux/fs/ext2/ialloc.c
|
* linux/fs/ext2/ialloc.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)
|
*
|
*
|
* BSD ufs-inspired inode and directory allocation by
|
* BSD ufs-inspired inode and directory allocation by
|
* Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
|
* 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
|
*/
|
*/
|
|
|
/*
|
/*
|
* ialloc.c contains the inodes allocation and deallocation routines
|
* ialloc.c contains the inodes allocation and deallocation routines
|
*/
|
*/
|
|
|
/*
|
/*
|
* The free inodes are managed by bitmaps. A file system contains several
|
* The free inodes 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).
|
*/
|
*/
|
|
|
#include <linux/fs.h>
|
#include <linux/fs.h>
|
#include <linux/ext2_fs.h>
|
#include <linux/ext2_fs.h>
|
#include <linux/sched.h>
|
#include <linux/sched.h>
|
#include <linux/stat.h>
|
#include <linux/stat.h>
|
#include <linux/string.h>
|
#include <linux/string.h>
|
#include <linux/locks.h>
|
#include <linux/locks.h>
|
|
|
#include <asm/bitops.h>
|
#include <asm/bitops.h>
|
#include <asm/byteorder.h>
|
#include <asm/byteorder.h>
|
|
|
static struct ext2_group_desc * get_group_desc (struct super_block * sb,
|
static struct ext2_group_desc * 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_panic (sb, "get_group_desc",
|
ext2_panic (sb, "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);
|
|
|
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_panic (sb, "get_group_desc",
|
ext2_panic (sb, "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);
|
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 inode allocation bitmap for a given block_group, reading
|
* Read the inode allocation bitmap for a given block_group, reading
|
* into the specified slot in the superblock's bitmap cache.
|
* into the specified 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_inode_bitmap (struct super_block * sb,
|
static int read_inode_bitmap (struct super_block * sb,
|
unsigned long block_group,
|
unsigned long block_group,
|
unsigned int bitmap_nr)
|
unsigned int bitmap_nr)
|
{
|
{
|
struct ext2_group_desc * gdp;
|
struct ext2_group_desc * gdp;
|
struct buffer_head * bh;
|
struct buffer_head * bh;
|
int retval = 0;
|
int retval = 0;
|
|
|
gdp = get_group_desc (sb, block_group, NULL);
|
gdp = get_group_desc (sb, block_group, NULL);
|
bh = bread (sb->s_dev, swab32(gdp->bg_inode_bitmap), sb->s_blocksize);
|
bh = bread (sb->s_dev, swab32(gdp->bg_inode_bitmap), sb->s_blocksize);
|
if (!bh) {
|
if (!bh) {
|
ext2_error (sb, "read_inode_bitmap",
|
ext2_error (sb, "read_inode_bitmap",
|
"Cannot read inode bitmap - "
|
"Cannot read inode bitmap - "
|
"block_group = %lu, inode_bitmap = %lu",
|
"block_group = %lu, inode_bitmap = %lu",
|
block_group, (unsigned long) swab32(gdp->bg_inode_bitmap));
|
block_group, (unsigned long) swab32(gdp->bg_inode_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.
|
*/
|
*/
|
sb->u.ext2_sb.s_inode_bitmap_number[bitmap_nr] = block_group;
|
sb->u.ext2_sb.s_inode_bitmap_number[bitmap_nr] = block_group;
|
sb->u.ext2_sb.s_inode_bitmap[bitmap_nr] = bh;
|
sb->u.ext2_sb.s_inode_bitmap[bitmap_nr] = bh;
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/*
|
/*
|
* load_inode_bitmap loads the inode bitmap for a blocks group
|
* load_inode_bitmap loads the inode 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_inode_bitmap (struct super_block * sb,
|
static int load_inode_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 inode_bitmap_number;
|
unsigned long inode_bitmap_number;
|
struct buffer_head * inode_bitmap;
|
struct buffer_head * inode_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_inode_bitmap",
|
ext2_panic (sb, "load_inode_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_loaded_inode_bitmaps > 0 &&
|
if (sb->u.ext2_sb.s_loaded_inode_bitmaps > 0 &&
|
sb->u.ext2_sb.s_inode_bitmap_number[0] == block_group)
|
sb->u.ext2_sb.s_inode_bitmap_number[0] == block_group)
|
return 0;
|
return 0;
|
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_inode_bitmap[block_group]) {
|
if (sb->u.ext2_sb.s_inode_bitmap[block_group]) {
|
if (sb->u.ext2_sb.s_inode_bitmap_number[block_group] != block_group)
|
if (sb->u.ext2_sb.s_inode_bitmap_number[block_group] != block_group)
|
ext2_panic (sb, "load_inode_bitmap",
|
ext2_panic (sb, "load_inode_bitmap",
|
"block_group != inode_bitmap_number");
|
"block_group != inode_bitmap_number");
|
else
|
else
|
return block_group;
|
return block_group;
|
} else {
|
} else {
|
retval = read_inode_bitmap (sb, block_group, block_group);
|
retval = read_inode_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_inode_bitmaps &&
|
for (i = 0; i < sb->u.ext2_sb.s_loaded_inode_bitmaps &&
|
sb->u.ext2_sb.s_inode_bitmap_number[i] != block_group;
|
sb->u.ext2_sb.s_inode_bitmap_number[i] != block_group;
|
i++)
|
i++)
|
;
|
;
|
if (i < sb->u.ext2_sb.s_loaded_inode_bitmaps &&
|
if (i < sb->u.ext2_sb.s_loaded_inode_bitmaps &&
|
sb->u.ext2_sb.s_inode_bitmap_number[i] == block_group) {
|
sb->u.ext2_sb.s_inode_bitmap_number[i] == block_group) {
|
inode_bitmap_number = sb->u.ext2_sb.s_inode_bitmap_number[i];
|
inode_bitmap_number = sb->u.ext2_sb.s_inode_bitmap_number[i];
|
inode_bitmap = sb->u.ext2_sb.s_inode_bitmap[i];
|
inode_bitmap = sb->u.ext2_sb.s_inode_bitmap[i];
|
for (j = i; j > 0; j--) {
|
for (j = i; j > 0; j--) {
|
sb->u.ext2_sb.s_inode_bitmap_number[j] =
|
sb->u.ext2_sb.s_inode_bitmap_number[j] =
|
sb->u.ext2_sb.s_inode_bitmap_number[j - 1];
|
sb->u.ext2_sb.s_inode_bitmap_number[j - 1];
|
sb->u.ext2_sb.s_inode_bitmap[j] =
|
sb->u.ext2_sb.s_inode_bitmap[j] =
|
sb->u.ext2_sb.s_inode_bitmap[j - 1];
|
sb->u.ext2_sb.s_inode_bitmap[j - 1];
|
}
|
}
|
sb->u.ext2_sb.s_inode_bitmap_number[0] = inode_bitmap_number;
|
sb->u.ext2_sb.s_inode_bitmap_number[0] = inode_bitmap_number;
|
sb->u.ext2_sb.s_inode_bitmap[0] = inode_bitmap;
|
sb->u.ext2_sb.s_inode_bitmap[0] = inode_bitmap;
|
|
|
/*
|
/*
|
* There's still one special case here --- if inode_bitmap == 0
|
* There's still one special case here --- if inode_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 (!inode_bitmap)
|
if (!inode_bitmap)
|
retval = read_inode_bitmap (sb, block_group, 0);
|
retval = read_inode_bitmap (sb, block_group, 0);
|
} else {
|
} else {
|
if (sb->u.ext2_sb.s_loaded_inode_bitmaps < EXT2_MAX_GROUP_LOADED)
|
if (sb->u.ext2_sb.s_loaded_inode_bitmaps < EXT2_MAX_GROUP_LOADED)
|
sb->u.ext2_sb.s_loaded_inode_bitmaps++;
|
sb->u.ext2_sb.s_loaded_inode_bitmaps++;
|
else
|
else
|
brelse (sb->u.ext2_sb.s_inode_bitmap[EXT2_MAX_GROUP_LOADED - 1]);
|
brelse (sb->u.ext2_sb.s_inode_bitmap[EXT2_MAX_GROUP_LOADED - 1]);
|
for (j = sb->u.ext2_sb.s_loaded_inode_bitmaps - 1; j > 0; j--) {
|
for (j = sb->u.ext2_sb.s_loaded_inode_bitmaps - 1; j > 0; j--) {
|
sb->u.ext2_sb.s_inode_bitmap_number[j] =
|
sb->u.ext2_sb.s_inode_bitmap_number[j] =
|
sb->u.ext2_sb.s_inode_bitmap_number[j - 1];
|
sb->u.ext2_sb.s_inode_bitmap_number[j - 1];
|
sb->u.ext2_sb.s_inode_bitmap[j] =
|
sb->u.ext2_sb.s_inode_bitmap[j] =
|
sb->u.ext2_sb.s_inode_bitmap[j - 1];
|
sb->u.ext2_sb.s_inode_bitmap[j - 1];
|
}
|
}
|
retval = read_inode_bitmap (sb, block_group, 0);
|
retval = read_inode_bitmap (sb, block_group, 0);
|
}
|
}
|
return retval;
|
return retval;
|
}
|
}
|
|
|
void ext2_free_inode (struct inode * inode)
|
void ext2_free_inode (struct inode * inode)
|
{
|
{
|
struct super_block * sb;
|
struct super_block * sb;
|
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;
|
int bitmap_nr;
|
int bitmap_nr;
|
struct ext2_group_desc * gdp;
|
struct ext2_group_desc * gdp;
|
struct ext2_super_block * es;
|
struct ext2_super_block * es;
|
|
|
if (!inode)
|
if (!inode)
|
return;
|
return;
|
if (!inode->i_dev) {
|
if (!inode->i_dev) {
|
printk ("ext2_free_inode: inode has no device\n");
|
printk ("ext2_free_inode: inode has no device\n");
|
return;
|
return;
|
}
|
}
|
if (inode->i_count > 1) {
|
if (inode->i_count > 1) {
|
printk ("ext2_free_inode: inode has count=%ld\n",
|
printk ("ext2_free_inode: inode has count=%ld\n",
|
inode->i_count);
|
inode->i_count);
|
return;
|
return;
|
}
|
}
|
if (inode->i_nlink) {
|
if (inode->i_nlink) {
|
printk ("ext2_free_inode: inode has nlink=%d\n",
|
printk ("ext2_free_inode: inode has nlink=%d\n",
|
inode->i_nlink);
|
inode->i_nlink);
|
return;
|
return;
|
}
|
}
|
sb = inode->i_sb;
|
sb = inode->i_sb;
|
if (!sb) {
|
if (!sb) {
|
printk("ext2_free_inode: inode on nonexistent device\n");
|
printk("ext2_free_inode: inode on nonexistent device\n");
|
return;
|
return;
|
}
|
}
|
|
|
ext2_debug ("freeing inode %lu\n", inode->i_ino);
|
ext2_debug ("freeing inode %lu\n", inode->i_ino);
|
|
|
/* We need to kill quota references now, before grabbing the
|
/* We need to kill quota references now, before grabbing the
|
* superblock lock because writing the quota out to disk
|
* superblock lock because writing the quota out to disk
|
* may need to lock the superblock as well.
|
* may need to lock the superblock as well.
|
*
|
*
|
* It is safe to do this early instead of the original
|
* It is safe to do this early instead of the original
|
* places because we cannot be here in ext2_free_inode
|
* places because we cannot be here in ext2_free_inode
|
* if any other references to this inode exist at all.
|
* if any other references to this inode exist at all.
|
*
|
*
|
* Based upon a 2.1.x fix by Bill Hawes. --DaveM
|
* Based upon a 2.1.x fix by Bill Hawes. --DaveM
|
*/
|
*/
|
if (sb->dq_op) {
|
if (sb->dq_op) {
|
sb->dq_op->free_inode (inode, 1);
|
sb->dq_op->free_inode (inode, 1);
|
if (IS_WRITABLE (inode))
|
if (IS_WRITABLE (inode))
|
sb->dq_op->drop(inode);
|
sb->dq_op->drop(inode);
|
}
|
}
|
|
|
lock_super (sb);
|
lock_super (sb);
|
if (inode->i_ino < EXT2_FIRST_INO(sb) ||
|
if (inode->i_ino < EXT2_FIRST_INO(sb) ||
|
inode->i_ino > swab32(sb->u.ext2_sb.s_es->s_inodes_count)) {
|
inode->i_ino > swab32(sb->u.ext2_sb.s_es->s_inodes_count)) {
|
ext2_error (sb, "free_inode",
|
ext2_error (sb, "free_inode",
|
"reserved inode or nonexistent inode");
|
"reserved inode or nonexistent inode");
|
unlock_super (sb);
|
unlock_super (sb);
|
return;
|
return;
|
}
|
}
|
es = sb->u.ext2_sb.s_es;
|
es = sb->u.ext2_sb.s_es;
|
block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(sb);
|
block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(sb);
|
bit = (inode->i_ino - 1) % EXT2_INODES_PER_GROUP(sb);
|
bit = (inode->i_ino - 1) % EXT2_INODES_PER_GROUP(sb);
|
bitmap_nr = load_inode_bitmap (sb, block_group);
|
bitmap_nr = load_inode_bitmap (sb, block_group);
|
if (bitmap_nr < 0) {
|
if (bitmap_nr < 0) {
|
unlock_super (sb);
|
unlock_super (sb);
|
return;
|
return;
|
}
|
}
|
|
|
bh = sb->u.ext2_sb.s_inode_bitmap[bitmap_nr];
|
bh = sb->u.ext2_sb.s_inode_bitmap[bitmap_nr];
|
if (!__ext2_clear_bit (bit, bh->b_data))
|
if (!__ext2_clear_bit (bit, bh->b_data))
|
ext2_warning (sb, "ext2_free_inode",
|
ext2_warning (sb, "ext2_free_inode",
|
"bit already cleared for inode %lu", inode->i_ino);
|
"bit already cleared for inode %lu", inode->i_ino);
|
else {
|
else {
|
gdp = get_group_desc (sb, block_group, &bh2);
|
gdp = get_group_desc (sb, block_group, &bh2);
|
gdp->bg_free_inodes_count =
|
gdp->bg_free_inodes_count =
|
swab16(swab16(gdp->bg_free_inodes_count) + 1);
|
swab16(swab16(gdp->bg_free_inodes_count) + 1);
|
if (S_ISDIR(inode->i_mode))
|
if (S_ISDIR(inode->i_mode))
|
gdp->bg_used_dirs_count =
|
gdp->bg_used_dirs_count =
|
swab16(swab16(gdp->bg_used_dirs_count) - 1);
|
swab16(swab16(gdp->bg_used_dirs_count) - 1);
|
mark_buffer_dirty(bh2, 1);
|
mark_buffer_dirty(bh2, 1);
|
es->s_free_inodes_count =
|
es->s_free_inodes_count =
|
swab32(swab32(es->s_free_inodes_count) + 1);
|
swab32(swab32(es->s_free_inodes_count) + 1);
|
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
|
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
|
inode->i_dirt = 0;
|
inode->i_dirt = 0;
|
}
|
}
|
mark_buffer_dirty(bh, 1);
|
mark_buffer_dirty(bh, 1);
|
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);
|
}
|
}
|
sb->s_dirt = 1;
|
sb->s_dirt = 1;
|
clear_inode (inode);
|
clear_inode (inode);
|
unlock_super (sb);
|
unlock_super (sb);
|
}
|
}
|
|
|
/*
|
/*
|
* This function increments the inode version number
|
* This function increments the inode version number
|
*
|
*
|
* This may be used one day by the NFS server
|
* This may be used one day by the NFS server
|
*/
|
*/
|
static void inc_inode_version (struct inode * inode,
|
static void inc_inode_version (struct inode * inode,
|
struct ext2_group_desc *gdp,
|
struct ext2_group_desc *gdp,
|
int mode)
|
int mode)
|
{
|
{
|
inode->u.ext2_i.i_version++;
|
inode->u.ext2_i.i_version++;
|
inode->i_dirt = 1;
|
inode->i_dirt = 1;
|
|
|
return;
|
return;
|
}
|
}
|
|
|
/*
|
/*
|
* There are two policies for allocating an inode. If the new inode is
|
* There are two policies for allocating an inode. If the new inode is
|
* a directory, then a forward search is made for a block group with both
|
* a directory, then a forward search is made for a block group with both
|
* free space and a low directory-to-inode ratio; if that fails, then of
|
* free space and a low directory-to-inode ratio; if that fails, then of
|
* the groups with above-average free space, that group with the fewest
|
* the groups with above-average free space, that group with the fewest
|
* directories already is chosen.
|
* directories already is chosen.
|
*
|
*
|
* For other inodes, search forward from the parent directory\'s block
|
* For other inodes, search forward from the parent directory\'s block
|
* group to find a free inode.
|
* group to find a free inode.
|
*/
|
*/
|
struct inode * ext2_new_inode (const struct inode * dir, int mode, int * err)
|
struct inode * ext2_new_inode (const struct inode * dir, int mode, int * err)
|
{
|
{
|
struct super_block * sb;
|
struct super_block * sb;
|
struct buffer_head * bh;
|
struct buffer_head * bh;
|
struct buffer_head * bh2;
|
struct buffer_head * bh2;
|
int i, j, avefreei;
|
int i, j, avefreei;
|
struct inode * inode;
|
struct inode * inode;
|
int bitmap_nr;
|
int bitmap_nr;
|
struct ext2_group_desc * gdp;
|
struct ext2_group_desc * gdp;
|
struct ext2_group_desc * tmp;
|
struct ext2_group_desc * tmp;
|
struct ext2_super_block * es;
|
struct ext2_super_block * es;
|
|
|
if (!dir || !(inode = get_empty_inode ()))
|
if (!dir || !(inode = get_empty_inode ()))
|
{
|
{
|
*err=-ENOMEM;
|
*err=-ENOMEM;
|
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;
|
lock_super (sb);
|
lock_super (sb);
|
es = sb->u.ext2_sb.s_es;
|
es = sb->u.ext2_sb.s_es;
|
repeat:
|
repeat:
|
gdp = NULL; i=0;
|
gdp = NULL; i=0;
|
|
|
*err = -ENOSPC;
|
*err = -ENOSPC;
|
if (S_ISDIR(mode)) {
|
if (S_ISDIR(mode)) {
|
avefreei = swab32(es->s_free_inodes_count) /
|
avefreei = swab32(es->s_free_inodes_count) /
|
sb->u.ext2_sb.s_groups_count;
|
sb->u.ext2_sb.s_groups_count;
|
/* I am not yet convinced that this next bit is necessary.
|
/* I am not yet convinced that this next bit is necessary.
|
i = dir->u.ext2_i.i_block_group;
|
i = dir->u.ext2_i.i_block_group;
|
for (j = 0; j < sb->u.ext2_sb.s_groups_count; j++) {
|
for (j = 0; j < sb->u.ext2_sb.s_groups_count; j++) {
|
tmp = get_group_desc (sb, i, &bh2);
|
tmp = get_group_desc (sb, i, &bh2);
|
if ((swab16(tmp->bg_used_dirs_count) << 8) <
|
if ((swab16(tmp->bg_used_dirs_count) << 8) <
|
swab16(tmp->bg_free_inodes_count)) {
|
swab16(tmp->bg_free_inodes_count)) {
|
gdp = tmp;
|
gdp = tmp;
|
break;
|
break;
|
}
|
}
|
else
|
else
|
i = ++i % sb->u.ext2_sb.s_groups_count;
|
i = ++i % sb->u.ext2_sb.s_groups_count;
|
}
|
}
|
*/
|
*/
|
if (!gdp) {
|
if (!gdp) {
|
for (j = 0; j < sb->u.ext2_sb.s_groups_count; j++) {
|
for (j = 0; j < sb->u.ext2_sb.s_groups_count; j++) {
|
tmp = get_group_desc (sb, j, &bh2);
|
tmp = get_group_desc (sb, j, &bh2);
|
if (swab16(tmp->bg_free_inodes_count) &&
|
if (swab16(tmp->bg_free_inodes_count) &&
|
swab16(tmp->bg_free_inodes_count) >= avefreei) {
|
swab16(tmp->bg_free_inodes_count) >= avefreei) {
|
if (!gdp ||
|
if (!gdp ||
|
(swab16(tmp->bg_free_blocks_count) >
|
(swab16(tmp->bg_free_blocks_count) >
|
swab16(gdp->bg_free_blocks_count))) {
|
swab16(gdp->bg_free_blocks_count))) {
|
i = j;
|
i = j;
|
gdp = tmp;
|
gdp = tmp;
|
}
|
}
|
}
|
}
|
}
|
}
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
/*
|
/*
|
* Try to place the inode in its parent directory
|
* Try to place the inode in its parent directory
|
*/
|
*/
|
i = dir->u.ext2_i.i_block_group;
|
i = dir->u.ext2_i.i_block_group;
|
tmp = get_group_desc (sb, i, &bh2);
|
tmp = get_group_desc (sb, i, &bh2);
|
if (swab16(tmp->bg_free_inodes_count))
|
if (swab16(tmp->bg_free_inodes_count))
|
gdp = tmp;
|
gdp = tmp;
|
else
|
else
|
{
|
{
|
/*
|
/*
|
* Use a quadratic hash to find a group with a
|
* Use a quadratic hash to find a group with a
|
* free inode
|
* free inode
|
*/
|
*/
|
for (j = 1; j < sb->u.ext2_sb.s_groups_count; j <<= 1) {
|
for (j = 1; j < sb->u.ext2_sb.s_groups_count; j <<= 1) {
|
i += j;
|
i += j;
|
if (i >= sb->u.ext2_sb.s_groups_count)
|
if (i >= sb->u.ext2_sb.s_groups_count)
|
i -= sb->u.ext2_sb.s_groups_count;
|
i -= sb->u.ext2_sb.s_groups_count;
|
tmp = get_group_desc (sb, i, &bh2);
|
tmp = get_group_desc (sb, i, &bh2);
|
if (swab16(tmp->bg_free_inodes_count)) {
|
if (swab16(tmp->bg_free_inodes_count)) {
|
gdp = tmp;
|
gdp = tmp;
|
break;
|
break;
|
}
|
}
|
}
|
}
|
}
|
}
|
if (!gdp) {
|
if (!gdp) {
|
/*
|
/*
|
* That failed: try linear search for a free inode
|
* That failed: try linear search for a free inode
|
*/
|
*/
|
i = dir->u.ext2_i.i_block_group + 1;
|
i = dir->u.ext2_i.i_block_group + 1;
|
for (j = 2; j < sb->u.ext2_sb.s_groups_count; j++) {
|
for (j = 2; j < sb->u.ext2_sb.s_groups_count; j++) {
|
if (++i >= sb->u.ext2_sb.s_groups_count)
|
if (++i >= sb->u.ext2_sb.s_groups_count)
|
i = 0;
|
i = 0;
|
tmp = get_group_desc (sb, i, &bh2);
|
tmp = get_group_desc (sb, i, &bh2);
|
if (swab16(tmp->bg_free_inodes_count)) {
|
if (swab16(tmp->bg_free_inodes_count)) {
|
gdp = tmp;
|
gdp = tmp;
|
break;
|
break;
|
}
|
}
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
if (!gdp) {
|
if (!gdp) {
|
unlock_super (sb);
|
unlock_super (sb);
|
iput(inode);
|
iput(inode);
|
return NULL;
|
return NULL;
|
}
|
}
|
bitmap_nr = load_inode_bitmap (sb, i);
|
bitmap_nr = load_inode_bitmap (sb, i);
|
if (bitmap_nr < 0) {
|
if (bitmap_nr < 0) {
|
unlock_super (sb);
|
unlock_super (sb);
|
iput(inode);
|
iput(inode);
|
*err = -EIO;
|
*err = -EIO;
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
bh = sb->u.ext2_sb.s_inode_bitmap[bitmap_nr];
|
bh = sb->u.ext2_sb.s_inode_bitmap[bitmap_nr];
|
if ((j = __ext2_find_first_zero_bit ((unsigned long *) bh->b_data,
|
if ((j = __ext2_find_first_zero_bit ((unsigned long *) bh->b_data,
|
EXT2_INODES_PER_GROUP(sb))) <
|
EXT2_INODES_PER_GROUP(sb))) <
|
EXT2_INODES_PER_GROUP(sb)) {
|
EXT2_INODES_PER_GROUP(sb)) {
|
if (__ext2_set_bit (j, bh->b_data)) {
|
if (__ext2_set_bit (j, bh->b_data)) {
|
ext2_warning (sb, "ext2_new_inode",
|
ext2_warning (sb, "ext2_new_inode",
|
"bit already set for inode %d", j);
|
"bit already set for inode %d", j);
|
goto repeat;
|
goto repeat;
|
}
|
}
|
mark_buffer_dirty(bh, 1);
|
mark_buffer_dirty(bh, 1);
|
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);
|
}
|
}
|
} else {
|
} else {
|
if (swab16(gdp->bg_free_inodes_count) != 0) {
|
if (swab16(gdp->bg_free_inodes_count) != 0) {
|
ext2_error (sb, "ext2_new_inode",
|
ext2_error (sb, "ext2_new_inode",
|
"Free inodes count corrupted in group %d",
|
"Free inodes count corrupted in group %d",
|
i);
|
i);
|
unlock_super (sb);
|
unlock_super (sb);
|
iput (inode);
|
iput (inode);
|
return NULL;
|
return NULL;
|
}
|
}
|
goto repeat;
|
goto repeat;
|
}
|
}
|
j += i * EXT2_INODES_PER_GROUP(sb) + 1;
|
j += i * EXT2_INODES_PER_GROUP(sb) + 1;
|
if (j < EXT2_FIRST_INO(sb) || j > swab32(es->s_inodes_count)) {
|
if (j < EXT2_FIRST_INO(sb) || j > swab32(es->s_inodes_count)) {
|
ext2_error (sb, "ext2_new_inode",
|
ext2_error (sb, "ext2_new_inode",
|
"reserved inode or inode > inodes count - "
|
"reserved inode or inode > inodes count - "
|
"block_group = %d,inode=%d", i, j);
|
"block_group = %d,inode=%d", i, j);
|
unlock_super (sb);
|
unlock_super (sb);
|
iput (inode);
|
iput (inode);
|
return NULL;
|
return NULL;
|
}
|
}
|
gdp->bg_free_inodes_count =
|
gdp->bg_free_inodes_count =
|
swab16(swab16(gdp->bg_free_inodes_count) - 1);
|
swab16(swab16(gdp->bg_free_inodes_count) - 1);
|
if (S_ISDIR(mode))
|
if (S_ISDIR(mode))
|
gdp->bg_used_dirs_count =
|
gdp->bg_used_dirs_count =
|
swab16(swab16(gdp->bg_used_dirs_count) + 1);
|
swab16(swab16(gdp->bg_used_dirs_count) + 1);
|
mark_buffer_dirty(bh2, 1);
|
mark_buffer_dirty(bh2, 1);
|
es->s_free_inodes_count =
|
es->s_free_inodes_count =
|
swab32(swab32(es->s_free_inodes_count) - 1);
|
swab32(swab32(es->s_free_inodes_count) - 1);
|
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
|
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
|
sb->s_dirt = 1;
|
sb->s_dirt = 1;
|
inode->i_mode = mode;
|
inode->i_mode = mode;
|
inode->i_sb = sb;
|
inode->i_sb = sb;
|
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;
|
if (test_opt (sb, GRPID))
|
if (test_opt (sb, GRPID))
|
inode->i_gid = dir->i_gid;
|
inode->i_gid = dir->i_gid;
|
else if (dir->i_mode & S_ISGID) {
|
else if (dir->i_mode & S_ISGID) {
|
inode->i_gid = dir->i_gid;
|
inode->i_gid = dir->i_gid;
|
if (S_ISDIR(mode))
|
if (S_ISDIR(mode))
|
mode |= S_ISGID;
|
mode |= S_ISGID;
|
} else
|
} else
|
inode->i_gid = current->fsgid;
|
inode->i_gid = current->fsgid;
|
inode->i_dirt = 1;
|
inode->i_dirt = 1;
|
inode->i_ino = j;
|
inode->i_ino = j;
|
inode->i_blksize = PAGE_SIZE; /* This is the optimal IO size (for stat), not the fs block size */
|
inode->i_blksize = PAGE_SIZE; /* This is the optimal IO size (for stat), not the fs block size */
|
inode->i_blocks = 0;
|
inode->i_blocks = 0;
|
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
|
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
|
inode->u.ext2_i.i_new_inode = 1;
|
inode->u.ext2_i.i_new_inode = 1;
|
inode->u.ext2_i.i_flags = dir->u.ext2_i.i_flags;
|
inode->u.ext2_i.i_flags = dir->u.ext2_i.i_flags;
|
if (S_ISLNK(mode))
|
if (S_ISLNK(mode))
|
inode->u.ext2_i.i_flags &= ~(EXT2_IMMUTABLE_FL | EXT2_APPEND_FL);
|
inode->u.ext2_i.i_flags &= ~(EXT2_IMMUTABLE_FL | EXT2_APPEND_FL);
|
inode->u.ext2_i.i_faddr = 0;
|
inode->u.ext2_i.i_faddr = 0;
|
inode->u.ext2_i.i_frag_no = 0;
|
inode->u.ext2_i.i_frag_no = 0;
|
inode->u.ext2_i.i_frag_size = 0;
|
inode->u.ext2_i.i_frag_size = 0;
|
inode->u.ext2_i.i_file_acl = 0;
|
inode->u.ext2_i.i_file_acl = 0;
|
inode->u.ext2_i.i_dir_acl = 0;
|
inode->u.ext2_i.i_dir_acl = 0;
|
inode->u.ext2_i.i_dtime = 0;
|
inode->u.ext2_i.i_dtime = 0;
|
inode->u.ext2_i.i_block_group = i;
|
inode->u.ext2_i.i_block_group = i;
|
inode->i_op = NULL;
|
inode->i_op = NULL;
|
if (inode->u.ext2_i.i_flags & EXT2_SYNC_FL)
|
if (inode->u.ext2_i.i_flags & EXT2_SYNC_FL)
|
inode->i_flags |= MS_SYNCHRONOUS;
|
inode->i_flags |= MS_SYNCHRONOUS;
|
insert_inode_hash(inode);
|
insert_inode_hash(inode);
|
inc_inode_version (inode, gdp, mode);
|
inc_inode_version (inode, gdp, mode);
|
|
|
unlock_super (sb);
|
unlock_super (sb);
|
if (sb->dq_op) {
|
if (sb->dq_op) {
|
sb->dq_op->initialize (inode, -1);
|
sb->dq_op->initialize (inode, -1);
|
if (sb->dq_op->alloc_inode (inode, 1)) {
|
if (sb->dq_op->alloc_inode (inode, 1)) {
|
sb->dq_op->drop (inode);
|
sb->dq_op->drop (inode);
|
inode->i_nlink = 0;
|
inode->i_nlink = 0;
|
iput (inode);
|
iput (inode);
|
*err = -EDQUOT;
|
*err = -EDQUOT;
|
return NULL;
|
return NULL;
|
}
|
}
|
inode->i_flags |= S_WRITE;
|
inode->i_flags |= S_WRITE;
|
}
|
}
|
ext2_debug ("allocating inode %lu\n", inode->i_ino);
|
ext2_debug ("allocating inode %lu\n", inode->i_ino);
|
|
|
*err = 0;
|
*err = 0;
|
return inode;
|
return inode;
|
}
|
}
|
|
|
unsigned long ext2_count_free_inodes (struct super_block * sb)
|
unsigned long ext2_count_free_inodes (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 = get_group_desc (sb, i, NULL);
|
gdp = get_group_desc (sb, i, NULL);
|
desc_count += swab16(gdp->bg_free_inodes_count);
|
desc_count += swab16(gdp->bg_free_inodes_count);
|
bitmap_nr = load_inode_bitmap (sb, i);
|
bitmap_nr = load_inode_bitmap (sb, i);
|
if (bitmap_nr < 0)
|
if (bitmap_nr < 0)
|
continue;
|
continue;
|
|
|
x = ext2_count_free (sb->u.ext2_sb.s_inode_bitmap[bitmap_nr],
|
x = ext2_count_free (sb->u.ext2_sb.s_inode_bitmap[bitmap_nr],
|
EXT2_INODES_PER_GROUP(sb) / 8);
|
EXT2_INODES_PER_GROUP(sb) / 8);
|
printk ("group %d: stored = %d, counted = %lu\n",
|
printk ("group %d: stored = %d, counted = %lu\n",
|
i, swab16(gdp->bg_free_inodes_count), x);
|
i, swab16(gdp->bg_free_inodes_count), x);
|
bitmap_count += x;
|
bitmap_count += x;
|
}
|
}
|
printk("ext2_count_free_inodes: stored = %lu, computed = %lu, %lu\n",
|
printk("ext2_count_free_inodes: stored = %lu, computed = %lu, %lu\n",
|
swab32(es->s_free_inodes_count), desc_count, bitmap_count);
|
swab32(es->s_free_inodes_count), desc_count, bitmap_count);
|
unlock_super (sb);
|
unlock_super (sb);
|
return desc_count;
|
return desc_count;
|
#else
|
#else
|
return swab32(sb->u.ext2_sb.s_es->s_free_inodes_count);
|
return swab32(sb->u.ext2_sb.s_es->s_free_inodes_count);
|
#endif
|
#endif
|
}
|
}
|
|
|
void ext2_check_inodes_bitmap (struct super_block * sb)
|
void ext2_check_inodes_bitmap (struct super_block * sb)
|
{
|
{
|
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 = get_group_desc (sb, i, NULL);
|
gdp = get_group_desc (sb, i, NULL);
|
desc_count += swab16(gdp->bg_free_inodes_count);
|
desc_count += swab16(gdp->bg_free_inodes_count);
|
bitmap_nr = load_inode_bitmap (sb, i);
|
bitmap_nr = load_inode_bitmap (sb, i);
|
if (bitmap_nr < 0)
|
if (bitmap_nr < 0)
|
continue;
|
continue;
|
|
|
x = ext2_count_free (sb->u.ext2_sb.s_inode_bitmap[bitmap_nr],
|
x = ext2_count_free (sb->u.ext2_sb.s_inode_bitmap[bitmap_nr],
|
EXT2_INODES_PER_GROUP(sb) / 8);
|
EXT2_INODES_PER_GROUP(sb) / 8);
|
if (swab16(gdp->bg_free_inodes_count) != x)
|
if (swab16(gdp->bg_free_inodes_count) != x)
|
ext2_error (sb, "ext2_check_inodes_bitmap",
|
ext2_error (sb, "ext2_check_inodes_bitmap",
|
"Wrong free inodes count in group %d, "
|
"Wrong free inodes count in group %d, "
|
"stored = %d, counted = %lu", i,
|
"stored = %d, counted = %lu", i,
|
swab16(gdp->bg_free_inodes_count), x);
|
swab16(gdp->bg_free_inodes_count), x);
|
bitmap_count += x;
|
bitmap_count += x;
|
}
|
}
|
if (swab32(es->s_free_inodes_count) != bitmap_count)
|
if (swab32(es->s_free_inodes_count) != bitmap_count)
|
ext2_error (sb, "ext2_check_inodes_bitmap",
|
ext2_error (sb, "ext2_check_inodes_bitmap",
|
"Wrong free inodes count in super block, "
|
"Wrong free inodes count in super block, "
|
"stored = %lu, counted = %lu",
|
"stored = %lu, counted = %lu",
|
(unsigned long) swab32(es->s_free_inodes_count),
|
(unsigned long) swab32(es->s_free_inodes_count),
|
bitmap_count);
|
bitmap_count);
|
unlock_super (sb);
|
unlock_super (sb);
|
}
|
}
|
|
|
