240 lines
6.3 KiB
C
240 lines
6.3 KiB
C
/*
|
|
* res_gdt.c --- reserve blocks for growing the group descriptor table
|
|
* during online resizing.
|
|
*
|
|
* Copyright (C) 2002 Andreas Dilger
|
|
*
|
|
* %Begin-Header%
|
|
* This file may be redistributed under the terms of the GNU Library
|
|
* General Public License, version 2.
|
|
* %End-Header%
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
#include "ext2_fs.h"
|
|
#include "ext2fs.h"
|
|
|
|
/*
|
|
* Iterate through the groups which hold BACKUP superblock/GDT copies in an
|
|
* ext3 filesystem. The counters should be initialized to 1, 5, and 7 before
|
|
* calling this for the first time. In a sparse filesystem it will be the
|
|
* sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ...
|
|
* For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ...
|
|
*/
|
|
static unsigned int list_backups(ext2_filsys fs, unsigned int *three,
|
|
unsigned int *five, unsigned int *seven)
|
|
{
|
|
unsigned int *min = three;
|
|
int mult = 3;
|
|
unsigned int ret;
|
|
|
|
if (ext2fs_has_feature_sparse_super2(fs->super)) {
|
|
if (*min == 1) {
|
|
*min += 1;
|
|
if (fs->super->s_backup_bgs[0])
|
|
return fs->super->s_backup_bgs[0];
|
|
}
|
|
if (*min == 2) {
|
|
*min += 1;
|
|
if (fs->super->s_backup_bgs[1])
|
|
return fs->super->s_backup_bgs[1];
|
|
}
|
|
return fs->group_desc_count;
|
|
}
|
|
if (!ext2fs_has_feature_sparse_super(fs->super)) {
|
|
ret = *min;
|
|
*min += 1;
|
|
return ret;
|
|
}
|
|
|
|
if (*five < *min) {
|
|
min = five;
|
|
mult = 5;
|
|
}
|
|
if (*seven < *min) {
|
|
min = seven;
|
|
mult = 7;
|
|
}
|
|
|
|
ret = *min;
|
|
*min *= mult;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This code assumes that the reserved blocks have already been marked in-use
|
|
* during ext2fs_initialize(), so that they are not allocated for other
|
|
* uses before we can add them to the resize inode (which has to come
|
|
* after the creation of the inode table).
|
|
*/
|
|
errcode_t ext2fs_create_resize_inode(ext2_filsys fs)
|
|
{
|
|
errcode_t retval, retval2;
|
|
struct ext2_super_block *sb;
|
|
struct ext2_inode inode;
|
|
__u32 *dindir_buf, *gdt_buf;
|
|
unsigned long long apb, inode_size;
|
|
/* FIXME-64 - can't deal with extents */
|
|
blk_t dindir_blk, rsv_off, gdt_off, gdt_blk;
|
|
int dindir_dirty = 0, inode_dirty = 0, sb_blk = 0;
|
|
|
|
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
|
|
|
sb = fs->super;
|
|
|
|
retval = ext2fs_get_array(2, fs->blocksize, &dindir_buf);
|
|
if (retval)
|
|
return retval;
|
|
gdt_buf = (__u32 *)((char *)dindir_buf + fs->blocksize);
|
|
|
|
retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
|
|
if (retval)
|
|
goto out_free;
|
|
|
|
/*
|
|
* File systems with a blocksize of 1024 and bigalloc have
|
|
* sb->s_first_data_block of 0; yet the superblock is still at
|
|
* block #1. We compensate for it here.
|
|
*/
|
|
sb_blk = sb->s_first_data_block;
|
|
if (fs->blocksize == 1024 && sb_blk == 0)
|
|
sb_blk = 1;
|
|
|
|
/* Maximum possible file size (we only use double indirect blocks) */
|
|
apb = EXT2_ADDR_PER_BLOCK(sb);
|
|
if ((dindir_blk = inode.i_block[EXT2_DIND_BLOCK])) {
|
|
#ifdef RES_GDT_DEBUG
|
|
printf("reading GDT dindir %u\n", dindir_blk);
|
|
#endif
|
|
retval = ext2fs_read_ind_block(fs, dindir_blk, dindir_buf);
|
|
if (retval)
|
|
goto out_inode;
|
|
} else {
|
|
blk_t goal = sb_blk + fs->desc_blocks +
|
|
sb->s_reserved_gdt_blocks + 2 +
|
|
fs->inode_blocks_per_group;
|
|
|
|
retval = ext2fs_alloc_block(fs, goal, 0, &dindir_blk);
|
|
if (retval)
|
|
goto out_free;
|
|
inode.i_mode = LINUX_S_IFREG | 0600;
|
|
inode.i_links_count = 1;
|
|
inode.i_block[EXT2_DIND_BLOCK] = dindir_blk;
|
|
ext2fs_iblk_set(fs, &inode, 1);
|
|
memset(dindir_buf, 0, fs->blocksize);
|
|
#ifdef RES_GDT_DEBUG
|
|
printf("allocated GDT dindir %u\n", dindir_blk);
|
|
#endif
|
|
dindir_dirty = inode_dirty = 1;
|
|
inode_size = apb*apb + apb + EXT2_NDIR_BLOCKS;
|
|
inode_size *= fs->blocksize;
|
|
retval = ext2fs_inode_size_set(fs, &inode, inode_size);
|
|
if (retval)
|
|
goto out_free;
|
|
inode.i_ctime = fs->now ? fs->now : time(0);
|
|
}
|
|
|
|
for (rsv_off = 0, gdt_off = fs->desc_blocks,
|
|
gdt_blk = sb_blk + 1 + fs->desc_blocks;
|
|
rsv_off < sb->s_reserved_gdt_blocks;
|
|
rsv_off++, gdt_off++, gdt_blk++) {
|
|
unsigned int three = 1, five = 5, seven = 7;
|
|
unsigned int grp, last = 0;
|
|
int gdt_dirty = 0;
|
|
|
|
gdt_off %= apb;
|
|
if (!dindir_buf[gdt_off]) {
|
|
/* FIXME XXX XXX
|
|
blk_t new_blk;
|
|
|
|
retval = ext2fs_new_block(fs, gdt_blk, 0, &new_blk);
|
|
if (retval)
|
|
goto out_free;
|
|
if (new_blk != gdt_blk) {
|
|
// XXX free block
|
|
retval = -1; // XXX
|
|
}
|
|
*/
|
|
gdt_dirty = dindir_dirty = inode_dirty = 1;
|
|
memset(gdt_buf, 0, fs->blocksize);
|
|
dindir_buf[gdt_off] = gdt_blk;
|
|
ext2fs_iblk_add_blocks(fs, &inode, 1);
|
|
#ifdef RES_GDT_DEBUG
|
|
printf("added primary GDT block %u at %u[%u]\n",
|
|
gdt_blk, dindir_blk, gdt_off);
|
|
#endif
|
|
} else if (dindir_buf[gdt_off] == gdt_blk) {
|
|
#ifdef RES_GDT_DEBUG
|
|
printf("reading primary GDT block %u\n", gdt_blk);
|
|
#endif
|
|
retval = ext2fs_read_ind_block(fs, gdt_blk, gdt_buf);
|
|
if (retval)
|
|
goto out_dindir;
|
|
} else {
|
|
#ifdef RES_GDT_DEBUG
|
|
printf("bad primary GDT %u != %u at %u[%u]\n",
|
|
dindir_buf[gdt_off], gdt_blk,dindir_blk,gdt_off);
|
|
#endif
|
|
retval = EXT2_ET_RESIZE_INODE_CORRUPT;
|
|
goto out_dindir;
|
|
}
|
|
|
|
while ((grp = list_backups(fs, &three, &five, &seven)) <
|
|
fs->group_desc_count) {
|
|
blk_t expect = gdt_blk + grp * sb->s_blocks_per_group;
|
|
|
|
if (!gdt_buf[last]) {
|
|
#ifdef RES_GDT_DEBUG
|
|
printf("added backup GDT %u grp %u@%u[%u]\n",
|
|
expect, grp, gdt_blk, last);
|
|
#endif
|
|
gdt_buf[last] = expect;
|
|
ext2fs_iblk_add_blocks(fs, &inode, 1);
|
|
gdt_dirty = inode_dirty = 1;
|
|
} else if (gdt_buf[last] != expect) {
|
|
#ifdef RES_GDT_DEBUG
|
|
printf("bad backup GDT %u != %u at %u[%u]\n",
|
|
gdt_buf[last], expect, gdt_blk, last);
|
|
#endif
|
|
retval = EXT2_ET_RESIZE_INODE_CORRUPT;
|
|
goto out_dindir;
|
|
}
|
|
last++;
|
|
}
|
|
if (gdt_dirty) {
|
|
#ifdef RES_GDT_DEBUG
|
|
printf("writing primary GDT block %u\n", gdt_blk);
|
|
#endif
|
|
retval = ext2fs_write_ind_block(fs, gdt_blk, gdt_buf);
|
|
if (retval)
|
|
goto out_dindir;
|
|
}
|
|
}
|
|
|
|
out_dindir:
|
|
if (dindir_dirty) {
|
|
retval2 = ext2fs_write_ind_block(fs, dindir_blk, dindir_buf);
|
|
if (!retval)
|
|
retval = retval2;
|
|
}
|
|
out_inode:
|
|
#ifdef RES_GDT_DEBUG
|
|
printf("inode.i_blocks = %u, i_size = %lu\n", inode.i_blocks,
|
|
EXT2_I_SIZE(&inode));
|
|
#endif
|
|
if (inode_dirty) {
|
|
inode.i_atime = inode.i_mtime = fs->now ? fs->now : time(0);
|
|
retval2 = ext2fs_write_new_inode(fs, EXT2_RESIZE_INO, &inode);
|
|
if (!retval)
|
|
retval = retval2;
|
|
}
|
|
out_free:
|
|
ext2fs_free_mem(&dindir_buf);
|
|
return retval;
|
|
}
|
|
|