diff options
Diffstat (limited to 'e2fsprogs/ext2fs/res_gdt.c')
| -rw-r--r-- | e2fsprogs/ext2fs/res_gdt.c | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/e2fsprogs/ext2fs/res_gdt.c b/e2fsprogs/ext2fs/res_gdt.c deleted file mode 100644 index f7ee8b1fb..000000000 --- a/e2fsprogs/ext2fs/res_gdt.c +++ /dev/null @@ -1,221 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* - * 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 Public - * License. - * %End-Header% - */ - -#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 (!(fs->super->s_feature_ro_compat & - EXT2_FEATURE_RO_COMPAT_SPARSE_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; - int rsv_add; - unsigned long long apb, inode_size; - blk_t dindir_blk, rsv_off, gdt_off, gdt_blk; - int dindir_dirty = 0, inode_dirty = 0; - - EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); - - sb = fs->super; - - retval = ext2fs_get_mem(2 * fs->blocksize, (void *)&dindir_buf); - if (retval) - goto out_free; - gdt_buf = (__u32 *)((char *)dindir_buf + fs->blocksize); - - retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode); - if (retval) - goto out_free; - - /* Maximum possible file size (we donly use the dindirect blocks) */ - apb = EXT2_ADDR_PER_BLOCK(sb); - rsv_add = fs->blocksize / 512; - 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 = 3 + sb->s_reserved_gdt_blocks + - fs->desc_blocks + 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; - inode.i_blocks = rsv_add; - 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; - inode.i_size = inode_size & 0xFFFFFFFF; - inode.i_size_high = (inode_size >> 32) & 0xFFFFFFFF; - if(inode.i_size_high) { - sb->s_feature_ro_compat |= - EXT2_FEATURE_RO_COMPAT_LARGE_FILE; - } - inode.i_ctime = time(0); - } - - for (rsv_off = 0, gdt_off = fs->desc_blocks, - gdt_blk = sb->s_first_data_block + 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; - inode.i_blocks += rsv_add; -#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; - inode.i_blocks += rsv_add; - 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 = %u\n", inode.i_blocks, - inode.i_size); -#endif - if (inode_dirty) { - inode.i_atime = inode.i_mtime = time(0); - retval2 = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode); - if (!retval) - retval = retval2; - } -out_free: - ext2fs_free_mem((void *)&dindir_buf); - return retval; -} - |