/*
* resize2fs.c --- ext2 main routine
*
- * Copyright (C) 1997 Theodore Ts'o
+ * Copyright (C) 1997, 1998 by Theodore Ts'o and
+ * PowerQuest, Inc.
+ *
+ * Copyright (C) 1999, 2000 by Theosore Ts'o
*
* %Begin-Header%
- * All rights reserved.
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
* %End-Header%
*/
+/*
+ * Resizing a filesystem consists of the following phases:
+ *
+ * 1. Adjust superblock and write out new parts of the inode
+ * table
+ * 2. Determine blocks which need to be relocated, and copy the
+ * contents of blocks from their old locations to the new ones.
+ * 3. Scan the inode table, doing the following:
+ * a. If blocks have been moved, update the block
+ * pointers in the inodes and indirect blocks to
+ * point at the new block locations.
+ * b. If parts of the inode table need to be evacuated,
+ * copy inodes from their old locations to their
+ * new ones.
+ * c. If (b) needs to be done, note which blocks contain
+ * directory information, since we will need to
+ * update the directory information.
+ * 4. Update the directory blocks with the new inode locations.
+ * 5. Move the inode tables, if necessary.
+ */
+
#include "resize2fs.h"
+#include <time.h>
+
+#ifdef __linux__ /* Kludge for debugging */
+#define RESIZE2FS_DEBUG
+#endif
+
+static errcode_t adjust_superblock(ext2_resize_t rfs, blk_t new_size);
+static errcode_t blocks_to_move(ext2_resize_t rfs);
+static errcode_t block_mover(ext2_resize_t rfs);
+static errcode_t inode_scan_and_fix(ext2_resize_t rfs);
+static errcode_t inode_ref_fix(ext2_resize_t rfs);
+static errcode_t move_itables(ext2_resize_t rfs);
+static errcode_t fix_resize_inode(ext2_filsys fs);
+static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs);
/*
- * This routine adjusts the superblock and other data structures...
+ * Some helper CPP macros
*/
-static errcode_t adjust_superblock(ext2_resize_t rfs, blk_t new_size)
+#define FS_BLOCK_BM(fs, i) ((fs)->group_desc[(i)].bg_block_bitmap)
+#define FS_INODE_BM(fs, i) ((fs)->group_desc[(i)].bg_inode_bitmap)
+#define FS_INODE_TB(fs, i) ((fs)->group_desc[(i)].bg_inode_table)
+
+#define IS_BLOCK_BM(fs, i, blk) ((blk) == FS_BLOCK_BM((fs),(i)))
+#define IS_INODE_BM(fs, i, blk) ((blk) == FS_INODE_BM((fs),(i)))
+
+#define IS_INODE_TB(fs, i, blk) (((blk) >= FS_INODE_TB((fs), (i))) && \
+ ((blk) < (FS_INODE_TB((fs), (i)) + \
+ (fs)->inode_blocks_per_group)))
+
+
+
+/*
+ * This is the top-level routine which does the dirty deed....
+ */
+errcode_t resize_fs(ext2_filsys fs, blk_t *new_size, int flags,
+ errcode_t (*progress)(ext2_resize_t rfs, int pass,
+ unsigned long cur,
+ unsigned long max_val))
{
- ext2_filsys fs;
+ ext2_resize_t rfs;
+ errcode_t retval;
+
+ retval = ext2fs_read_bitmaps(fs);
+ if (retval)
+ return retval;
+
+ /*
+ * Create the data structure
+ */
+ retval = ext2fs_get_mem(sizeof(struct ext2_resize_struct), &rfs);
+ if (retval)
+ return retval;
+ memset(rfs, 0, sizeof(struct ext2_resize_struct));
+
+ rfs->old_fs = fs;
+ rfs->flags = flags;
+ rfs->itable_buf = 0;
+ rfs->progress = progress;
+ retval = ext2fs_dup_handle(fs, &rfs->new_fs);
+ if (retval)
+ goto errout;
+
+ retval = adjust_superblock(rfs, *new_size);
+ if (retval)
+ goto errout;
+
+ *new_size = rfs->new_fs->super->s_blocks_count;
+
+ retval = blocks_to_move(rfs);
+ if (retval)
+ goto errout;
+
+#ifdef RESIZE2FS_DEBUG
+ if (rfs->flags & RESIZE_DEBUG_BMOVE)
+ printf("Number of free blocks: %u/%u, Needed: %d\n",
+ rfs->old_fs->super->s_free_blocks_count,
+ rfs->new_fs->super->s_free_blocks_count,
+ rfs->needed_blocks);
+#endif
+
+ retval = block_mover(rfs);
+ if (retval)
+ goto errout;
+
+ retval = inode_scan_and_fix(rfs);
+ if (retval)
+ goto errout;
+
+ retval = inode_ref_fix(rfs);
+ if (retval)
+ goto errout;
+
+ retval = move_itables(rfs);
+ if (retval)
+ goto errout;
+
+ retval = ext2fs_calculate_summary_stats(rfs->new_fs);
+ if (retval)
+ goto errout;
+
+ retval = fix_resize_inode(rfs->new_fs);
+ if (retval)
+ goto errout;
+
+ rfs->new_fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
+ retval = ext2fs_close(rfs->new_fs);
+ if (retval)
+ goto errout;
+
+ rfs->flags = flags;
+
+ ext2fs_free(rfs->old_fs);
+ if (rfs->itable_buf)
+ ext2fs_free_mem(&rfs->itable_buf);
+ ext2fs_free_mem(&rfs);
+
+ return 0;
+
+errout:
+ if (rfs->new_fs)
+ ext2fs_free(rfs->new_fs);
+ if (rfs->itable_buf)
+ ext2fs_free_mem(&rfs->itable_buf);
+ ext2fs_free_mem(&rfs);
+ return retval;
+}
+
+/* --------------------------------------------------------------------
+ *
+ * Resize processing, phase 1.
+ *
+ * In this phase we adjust the in-memory superblock information, and
+ * initialize any new parts of the inode table. The new parts of the
+ * inode table are created in virgin disk space, so we can abort here
+ * without any side effects.
+ * --------------------------------------------------------------------
+ */
+
+/*
+ * This routine is shared by the online and offline resize routines.
+ * All of the information which is adjusted in memory is done here.
+ */
+errcode_t adjust_fs_info(ext2_filsys fs, ext2_filsys old_fs, blk_t new_size)
+{
+ errcode_t retval;
int overhead = 0;
int rem;
- errcode_t retval;
- ino_t real_end;
blk_t blk, group_block;
- unsigned long i, j;
- struct ext2_group_desc *new;
- char *buf;
- int old_numblocks, numblocks, adjblocks;
-
- fs = rfs->new_fs;
+ ext2_ino_t real_end;
+ int adj, old_numblocks, numblocks, adjblocks;
+ unsigned long i, j, old_desc_blocks, max_group;
+ unsigned int meta_bg, meta_bg_size;
+ int has_super;
+ unsigned long long new_inodes; /* u64 to check for overflow */
+
fs->super->s_blocks_count = new_size;
- ext2fs_mark_super_dirty(fs);
- ext2fs_mark_bb_dirty(fs);
- ext2fs_mark_ib_dirty(fs);
retry:
- fs->group_desc_count = (fs->super->s_blocks_count -
- fs->super->s_first_data_block +
- EXT2_BLOCKS_PER_GROUP(fs->super) - 1)
- / EXT2_BLOCKS_PER_GROUP(fs->super);
+ fs->group_desc_count = ext2fs_div_ceil(fs->super->s_blocks_count -
+ fs->super->s_first_data_block,
+ EXT2_BLOCKS_PER_GROUP(fs->super));
if (fs->group_desc_count == 0)
return EXT2_ET_TOOSMALL;
- fs->desc_blocks = (fs->group_desc_count +
- EXT2_DESC_PER_BLOCK(fs->super) - 1)
- / EXT2_DESC_PER_BLOCK(fs->super);
+ fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
+ EXT2_DESC_PER_BLOCK(fs->super));
/*
* Overhead is the number of bookkeeping blocks per group. It
* includes the superblock backup, the group descriptor
* backups, the inode bitmap, the block bitmap, and the inode
* table.
- *
- * XXX Not all block groups need the descriptor blocks, but
- * being clever is tricky...
*/
- overhead = 3 + fs->desc_blocks + fs->inode_blocks_per_group;
-
+ overhead = (int) (2 + fs->inode_blocks_per_group);
+
+ if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1))
+ overhead += 1 + fs->desc_blocks +
+ fs->super->s_reserved_gdt_blocks;
+
/*
* See if the last group is big enough to support the
* necessary data structures. If not, we need to get rid of
/*
* Adjust the number of inodes
*/
+ new_inodes =(unsigned long long) fs->super->s_inodes_per_group * fs->group_desc_count;
+ if (new_inodes > ~0U) {
+ fprintf(stderr, _("inodes (%llu) must be less than %u"),
+ new_inodes, ~0U);
+ return EXT2_ET_TOO_MANY_INODES;
+ }
fs->super->s_inodes_count = fs->super->s_inodes_per_group *
fs->group_desc_count;
/*
* Adjust the number of free blocks
*/
- blk = rfs->old_fs->super->s_blocks_count;
+ blk = old_fs->super->s_blocks_count;
if (blk > fs->super->s_blocks_count)
fs->super->s_free_blocks_count -=
(blk - fs->super->s_blocks_count);
(fs->super->s_blocks_count - blk);
/*
+ * Adjust the number of reserved blocks
+ */
+ blk = (__u64)old_fs->super->s_r_blocks_count * 100 /
+ old_fs->super->s_blocks_count;
+ fs->super->s_r_blocks_count = e2p_percent(blk,
+ fs->super->s_blocks_count);
+
+ /*
* Adjust the bitmaps for size
*/
retval = ext2fs_resize_inode_bitmap(fs->super->s_inodes_count,
fs->super->s_inodes_count,
fs->inode_map);
- if (retval)
- return retval;
+ if (retval) goto errout;
real_end = ((EXT2_BLOCKS_PER_GROUP(fs->super)
* fs->group_desc_count)) - 1 +
retval = ext2fs_resize_block_bitmap(fs->super->s_blocks_count-1,
real_end, fs->block_map);
- if (retval)
- return retval;
+ if (retval) goto errout;
/*
* Reallocate the group descriptors as necessary.
*/
- if (rfs->old_fs->desc_blocks != fs->desc_blocks) {
- new = realloc(fs->group_desc,
- fs->desc_blocks * fs->blocksize);
- if (!new)
- return ENOMEM;
- fs->group_desc = new;
+ if (old_fs->desc_blocks != fs->desc_blocks) {
+ retval = ext2fs_resize_mem(old_fs->desc_blocks *
+ fs->blocksize,
+ fs->desc_blocks * fs->blocksize,
+ &fs->group_desc);
+ if (retval)
+ goto errout;
+ if (fs->desc_blocks > old_fs->desc_blocks)
+ memset((char *) fs->group_desc +
+ (old_fs->desc_blocks * fs->blocksize), 0,
+ (fs->desc_blocks - old_fs->desc_blocks) *
+ fs->blocksize);
+ }
+
+ /*
+ * If the resize_inode feature is set, and we are changing the
+ * number of descriptor blocks, then adjust
+ * s_reserved_gdt_blocks if possible to avoid needing to move
+ * the inode table either now or in the future.
+ */
+ if ((fs->super->s_feature_compat &
+ EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
+ (old_fs->desc_blocks != fs->desc_blocks)) {
+ int new;
+
+ new = ((int) fs->super->s_reserved_gdt_blocks) +
+ (old_fs->desc_blocks - fs->desc_blocks);
+ if (new < 0)
+ new = 0;
+ if (new > (int) fs->blocksize/4)
+ new = fs->blocksize/4;
+ fs->super->s_reserved_gdt_blocks = new;
+ if (new == 0)
+ fs->super->s_feature_compat &=
+ ~EXT2_FEATURE_COMPAT_RESIZE_INODE;
+ }
+
+ /*
+ * If we are shrinking the number block groups, we're done and
+ * can exit now.
+ */
+ if (old_fs->group_desc_count > fs->group_desc_count) {
+ retval = 0;
+ goto errout;
}
/*
* Fix the count of the last (old) block group
*/
- if (rfs->old_fs->group_desc_count > fs->group_desc_count)
- return 0;
- old_numblocks = (rfs->old_fs->super->s_blocks_count -
- rfs->old_fs->super->s_first_data_block) %
- rfs->old_fs->super->s_blocks_per_group;
+ old_numblocks = (old_fs->super->s_blocks_count -
+ old_fs->super->s_first_data_block) %
+ old_fs->super->s_blocks_per_group;
if (!old_numblocks)
- old_numblocks = rfs->old_fs->super->s_blocks_per_group;
- if (rfs->old_fs->group_desc_count == fs->group_desc_count) {
- numblocks = (rfs->new_fs->super->s_blocks_count -
- rfs->new_fs->super->s_first_data_block) %
- rfs->new_fs->super->s_blocks_per_group;
+ old_numblocks = old_fs->super->s_blocks_per_group;
+ if (old_fs->group_desc_count == fs->group_desc_count) {
+ numblocks = (fs->super->s_blocks_count -
+ fs->super->s_first_data_block) %
+ fs->super->s_blocks_per_group;
if (!numblocks)
- numblocks = rfs->new_fs->super->s_blocks_per_group;
+ numblocks = fs->super->s_blocks_per_group;
} else
- numblocks = rfs->new_fs->super->s_blocks_per_group;
- i = rfs->old_fs->group_desc_count - 1;
+ numblocks = fs->super->s_blocks_per_group;
+ i = old_fs->group_desc_count - 1;
fs->group_desc[i].bg_free_blocks_count += (numblocks-old_numblocks);
/*
+ * If the number of block groups is staying the same, we're
+ * done and can exit now. (If the number block groups is
+ * shrinking, we had exited earlier.)
+ */
+ if (old_fs->group_desc_count >= fs->group_desc_count) {
+ retval = 0;
+ goto errout;
+ }
+
+ /*
* Initialize the new block group descriptors
*/
- if (rfs->old_fs->group_desc_count >= fs->group_desc_count)
- return 0;
- buf = malloc(fs->blocksize);
- if (!buf)
- return ENOMEM;
- memset(buf, 0, fs->blocksize);
group_block = fs->super->s_first_data_block +
- rfs->old_fs->group_desc_count * fs->super->s_blocks_per_group;
- for (i = rfs->old_fs->group_desc_count;
+ old_fs->group_desc_count * fs->super->s_blocks_per_group;
+
+ adj = old_fs->group_desc_count;
+ max_group = fs->group_desc_count - adj;
+ if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
+ old_desc_blocks = fs->super->s_first_meta_bg;
+ else
+ old_desc_blocks = fs->desc_blocks +
+ fs->super->s_reserved_gdt_blocks;
+ for (i = old_fs->group_desc_count;
i < fs->group_desc_count; i++) {
memset(&fs->group_desc[i], 0,
sizeof(struct ext2_group_desc));
} else
numblocks = fs->super->s_blocks_per_group;
- if (ext2fs_bg_has_super(fs, i)) {
- for (j=0; j < fs->desc_blocks+1; j++)
+ has_super = ext2fs_bg_has_super(fs, i);
+ if (has_super) {
+ ext2fs_mark_block_bitmap(fs->block_map, group_block);
+ adjblocks++;
+ }
+ meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
+ meta_bg = i / meta_bg_size;
+ if (!(fs->super->s_feature_incompat &
+ EXT2_FEATURE_INCOMPAT_META_BG) ||
+ (meta_bg < fs->super->s_first_meta_bg)) {
+ if (has_super) {
+ for (j=0; j < old_desc_blocks; j++)
+ ext2fs_mark_block_bitmap(fs->block_map,
+ group_block + 1 + j);
+ adjblocks += old_desc_blocks;
+ }
+ } else {
+ if (has_super)
+ has_super = 1;
+ if (((i % meta_bg_size) == 0) ||
+ ((i % meta_bg_size) == 1) ||
+ ((i % meta_bg_size) == (meta_bg_size-1)))
ext2fs_mark_block_bitmap(fs->block_map,
- group_block + j);
- adjblocks = 1 + fs->desc_blocks;
+ group_block + has_super);
}
+
adjblocks += 2 + fs->inode_blocks_per_group;
numblocks -= adjblocks;
fs->group_desc[i].bg_used_dirs_count = 0;
retval = ext2fs_allocate_group_table(fs, i, 0);
+ if (retval) goto errout;
+
+ group_block += fs->super->s_blocks_per_group;
+ }
+ retval = 0;
+
+errout:
+ return (retval);
+}
+
+/*
+ * This routine adjusts the superblock and other data structures, both
+ * in disk as well as in memory...
+ */
+static errcode_t adjust_superblock(ext2_resize_t rfs, blk_t new_size)
+{
+ ext2_filsys fs;
+ int adj = 0;
+ errcode_t retval;
+ blk_t group_block;
+ unsigned long i;
+ unsigned long max_group;
+
+ fs = rfs->new_fs;
+ ext2fs_mark_super_dirty(fs);
+ ext2fs_mark_bb_dirty(fs);
+ ext2fs_mark_ib_dirty(fs);
+
+ retval = adjust_fs_info(fs, rfs->old_fs, new_size);
+ if (retval)
+ goto errout;
+
+ /*
+ * Check to make sure there are enough inodes
+ */
+ if ((rfs->old_fs->super->s_inodes_count -
+ rfs->old_fs->super->s_free_inodes_count) >
+ rfs->new_fs->super->s_inodes_count) {
+ retval = ENOSPC;
+ goto errout;
+ }
+
+ /*
+ * If we are shrinking the number block groups, we're done and
+ * can exit now.
+ */
+ if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
+ retval = 0;
+ goto errout;
+ }
+
+ /*
+ * If the number of block groups is staying the same, we're
+ * done and can exit now. (If the number block groups is
+ * shrinking, we had exited earlier.)
+ */
+ if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
+ retval = 0;
+ goto errout;
+ }
+
+ /*
+ * Initialize the new block group descriptors
+ */
+ retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
+ &rfs->itable_buf);
+ if (retval)
+ goto errout;
+
+ memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
+ group_block = fs->super->s_first_data_block +
+ rfs->old_fs->group_desc_count * fs->super->s_blocks_per_group;
+
+ adj = rfs->old_fs->group_desc_count;
+ max_group = fs->group_desc_count - adj;
+ if (rfs->progress) {
+ retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
+ 0, max_group);
if (retval)
- return retval;
+ goto errout;
+ }
+ for (i = rfs->old_fs->group_desc_count;
+ i < fs->group_desc_count; i++) {
+ /*
+ * Write out the new inode table
+ */
+ retval = io_channel_write_blk(fs->io,
+ fs->group_desc[i].bg_inode_table,
+ fs->inode_blocks_per_group,
+ rfs->itable_buf);
+ if (retval) goto errout;
- for (blk=fs->group_desc[i].bg_inode_table, j=0;
- j < fs->inode_blocks_per_group;
- blk++, j++) {
- retval = io_channel_write_blk(fs->io, blk, 1, buf);
+ io_channel_flush(fs->io);
+ if (rfs->progress) {
+ retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
+ i - adj + 1, max_group);
if (retval)
- return retval;
+ goto errout;
}
group_block += fs->super->s_blocks_per_group;
}
+ io_channel_flush(fs->io);
+ retval = 0;
+
+errout:
+ return retval;
+}
+
+/* --------------------------------------------------------------------
+ *
+ * Resize processing, phase 2.
+ *
+ * In this phase we adjust determine which blocks need to be moved, in
+ * blocks_to_move(). We then copy the blocks to their ultimate new
+ * destinations using block_mover(). Since we are copying blocks to
+ * their new locations, again during this pass we can abort without
+ * any problems.
+ * --------------------------------------------------------------------
+ */
+
+/*
+ * This helper function creates a block bitmap with all of the
+ * filesystem meta-data blocks.
+ */
+static errcode_t mark_table_blocks(ext2_filsys fs,
+ ext2fs_block_bitmap bmap)
+{
+ blk_t b;
+ unsigned int j;
+ dgrp_t i;
+ unsigned long meta_bg_size;
+ unsigned int old_desc_blocks;
+
+ meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
+ if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
+ old_desc_blocks = fs->super->s_first_meta_bg;
+ else
+ old_desc_blocks = fs->desc_blocks +
+ fs->super->s_reserved_gdt_blocks;
+ for (i = 0; i < fs->group_desc_count; i++) {
+ ext2fs_reserve_super_and_bgd(fs, i, bmap);
+
+ /*
+ * Mark the blocks used for the inode table
+ */
+ for (j = 0, b = fs->group_desc[i].bg_inode_table;
+ j < (unsigned int) fs->inode_blocks_per_group;
+ j++, b++)
+ ext2fs_mark_block_bitmap(bmap, b);
+
+ /*
+ * Mark block used for the block bitmap
+ */
+ ext2fs_mark_block_bitmap(bmap,
+ fs->group_desc[i].bg_block_bitmap);
+
+ /*
+ * Mark block used for the inode bitmap
+ */
+ ext2fs_mark_block_bitmap(bmap,
+ fs->group_desc[i].bg_inode_bitmap);
+ }
return 0;
}
/*
+ * This function checks to see if a particular block (either a
+ * superblock or a block group descriptor) overlaps with an inode or
+ * block bitmap block, or with the inode table.
+ */
+static void mark_fs_metablock(ext2_resize_t rfs,
+ ext2fs_block_bitmap meta_bmap,
+ int group, blk_t blk)
+{
+ ext2_filsys fs = rfs->new_fs;
+
+ ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
+ ext2fs_mark_block_bitmap(fs->block_map, blk);
+
+ /*
+ * Check to see if we overlap with the inode or block bitmap,
+ * or the inode tables. If not, and the block is in use, then
+ * mark it as a block to be moved.
+ */
+ if (IS_BLOCK_BM(fs, group, blk)) {
+ FS_BLOCK_BM(fs, group) = 0;
+ rfs->needed_blocks++;
+ } else if (IS_INODE_BM(fs, group, blk)) {
+ FS_INODE_BM(fs, group) = 0;
+ rfs->needed_blocks++;
+ } else if (IS_INODE_TB(fs, group, blk)) {
+ FS_INODE_TB(fs, group) = 0;
+ rfs->needed_blocks++;
+ } else if (ext2fs_test_block_bitmap(rfs->old_fs->block_map, blk) &&
+ !ext2fs_test_block_bitmap(meta_bmap, blk)) {
+ ext2fs_mark_block_bitmap(rfs->move_blocks, blk);
+ rfs->needed_blocks++;
+ }
+}
+
+
+/*
* This routine marks and unmarks reserved blocks in the new block
* bitmap. It also determines which blocks need to be moved and
* places this information into the move_blocks bitmap.
*/
-static errcode_t determine_relocations(ext2_resize_t rfs)
+static errcode_t blocks_to_move(ext2_resize_t rfs)
{
- int i, j;
- blk_t blk, group_blk;
- unsigned long old_blocks, new_blocks;
+ int j, has_super;
+ dgrp_t i, max_groups;
+ blk_t blk, group_blk;
+ unsigned long old_blocks, new_blocks;
+ unsigned int meta_bg, meta_bg_size;
errcode_t retval;
- ext2_filsys fs = rfs->new_fs;
+ ext2_filsys fs, old_fs;
+ ext2fs_block_bitmap meta_bmap;
- retval = ext2fs_allocate_block_bitmap(rfs->old_fs,
- "blocks to be moved",
+ fs = rfs->new_fs;
+ old_fs = rfs->old_fs;
+ if (old_fs->super->s_blocks_count > fs->super->s_blocks_count)
+ fs = rfs->old_fs;
+
+ retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
&rfs->reserve_blocks);
if (retval)
return retval;
+ retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
+ &rfs->move_blocks);
+ if (retval)
+ return retval;
+
+ retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
+ &meta_bmap);
+ if (retval)
+ return retval;
+
+ retval = mark_table_blocks(old_fs, meta_bmap);
+ if (retval)
+ return retval;
+
+ fs = rfs->new_fs;
+
/*
* If we're shrinking the filesystem, we need to move all of
* the blocks that don't fit any more
*/
for (blk = fs->super->s_blocks_count;
- blk < rfs->old_fs->super->s_blocks_count; blk++) {
- if (ext2fs_test_block_bitmap(rfs->old_fs->block_map, blk))
+ blk < old_fs->super->s_blocks_count; blk++) {
+ if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
+ !ext2fs_test_block_bitmap(meta_bmap, blk)) {
+ ext2fs_mark_block_bitmap(rfs->move_blocks, blk);
rfs->needed_blocks++;
+ }
ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
}
- old_blocks = rfs->old_fs->desc_blocks;
- new_blocks = fs->desc_blocks;
-
- if (old_blocks == new_blocks)
- return 0;
+ if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) {
+ old_blocks = old_fs->super->s_first_meta_bg;
+ new_blocks = fs->super->s_first_meta_bg;
+ } else {
+ old_blocks = old_fs->desc_blocks + old_fs->super->s_reserved_gdt_blocks;
+ new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
+ }
+
+ if (old_blocks == new_blocks) {
+ retval = 0;
+ goto errout;
+ }
- group_blk = rfs->old_fs->super->s_first_data_block;
+ max_groups = fs->group_desc_count;
+ if (max_groups > old_fs->group_desc_count)
+ max_groups = old_fs->group_desc_count;
+ group_blk = old_fs->super->s_first_data_block;
/*
* If we're reducing the number of descriptor blocks, this
* makes life easy. :-) We just have to mark some extra
* blocks as free.
*/
if (old_blocks > new_blocks) {
- for (i = 0; i < fs->group_desc_count; i++) {
+ for (i = 0; i < max_groups; i++) {
if (!ext2fs_bg_has_super(fs, i)) {
group_blk += fs->super->s_blocks_per_group;
continue;
}
- for (blk = group_blk+1+old_blocks;
- blk < group_blk+1+new_blocks; blk++)
+ for (blk = group_blk+1+new_blocks;
+ blk < group_blk+1+old_blocks; blk++) {
ext2fs_unmark_block_bitmap(fs->block_map,
blk);
+ rfs->needed_blocks--;
+ }
group_blk += fs->super->s_blocks_per_group;
}
- return 0;
+ retval = 0;
+ goto errout;
}
/*
* If we're increasing the number of descriptor blocks, life
* gets interesting....
*/
- for (i = 0; i < fs->group_desc_count; i++) {
- if (!ext2fs_bg_has_super(fs, i))
- goto next_group;
-
- for (blk = group_blk;
- blk < group_blk + 1 + new_blocks; blk++) {
- ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
- ext2fs_mark_block_bitmap(fs->block_map, blk);
+ meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
+ for (i = 0; i < max_groups; i++) {
+ has_super = ext2fs_bg_has_super(fs, i);
+ if (has_super)
+ mark_fs_metablock(rfs, meta_bmap, i, group_blk);
- /*
- * Check to see if we overlap with the inode
- * or block bitmap
- */
- if (blk == fs->group_desc[i].bg_inode_bitmap)
- fs->group_desc[i].bg_block_bitmap = 0;
- if (blk == fs->group_desc[i].bg_inode_bitmap)
- fs->group_desc[i].bg_inode_bitmap = 0;
-
- /*
- * Check to see if we overlap with the inode
- * table
- */
- if (blk < fs->group_desc[i].bg_inode_table)
- continue;
- if (blk >= (fs->group_desc[i].bg_inode_table +
- fs->inode_blocks_per_group))
- continue;
- fs->group_desc[i].bg_inode_table = 0;
- blk = fs->group_desc[i].bg_inode_table +
- fs->inode_blocks_per_group - 1;
+ meta_bg = i / meta_bg_size;
+ if (!(fs->super->s_feature_incompat &
+ EXT2_FEATURE_INCOMPAT_META_BG) ||
+ (meta_bg < fs->super->s_first_meta_bg)) {
+ if (has_super) {
+ for (blk = group_blk+1;
+ blk < group_blk + 1 + new_blocks; blk++)
+ mark_fs_metablock(rfs, meta_bmap,
+ i, blk);
+ }
+ } else {
+ if (has_super)
+ has_super = 1;
+ if (((i % meta_bg_size) == 0) ||
+ ((i % meta_bg_size) == 1) ||
+ ((i % meta_bg_size) == (meta_bg_size-1)))
+ mark_fs_metablock(rfs, meta_bmap, i,
+ group_blk + has_super);
}
+
if (fs->group_desc[i].bg_inode_table &&
fs->group_desc[i].bg_inode_bitmap &&
fs->group_desc[i].bg_block_bitmap)
goto next_group;
/*
- * Allocate the missing bitmap and inode table
- * structures, passing in rfs->reserve_blocks to
- * prevent a conflict.
+ * Reserve the existing meta blocks that we know
+ * aren't to be moved.
*/
if (fs->group_desc[i].bg_block_bitmap)
ext2fs_mark_block_bitmap(rfs->reserve_blocks,
ext2fs_mark_block_bitmap(rfs->reserve_blocks,
blk);
+ /*
+ * Allocate the missing data structures
+ */
retval = ext2fs_allocate_group_table(fs, i,
rfs->reserve_blocks);
if (retval)
- return retval;
+ goto errout;
/*
- * Now make sure these blocks are reserved in the new
- * block bitmap
+ * For those structures that have changed, we need to
+ * do bookkeepping.
*/
- ext2fs_mark_block_bitmap(fs->block_map,
- fs->group_desc[i].bg_block_bitmap);
- ext2fs_mark_block_bitmap(fs->block_map,
- fs->group_desc[i].bg_inode_bitmap);
+ if (FS_BLOCK_BM(old_fs, i) !=
+ (blk = FS_BLOCK_BM(fs, i))) {
+ ext2fs_mark_block_bitmap(fs->block_map, blk);
+ if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
+ !ext2fs_test_block_bitmap(meta_bmap, blk))
+ ext2fs_mark_block_bitmap(rfs->move_blocks,
+ blk);
+ }
+ if (FS_INODE_BM(old_fs, i) !=
+ (blk = FS_INODE_BM(fs, i))) {
+ ext2fs_mark_block_bitmap(fs->block_map, blk);
+ if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
+ !ext2fs_test_block_bitmap(meta_bmap, blk))
+ ext2fs_mark_block_bitmap(rfs->move_blocks,
+ blk);
+ }
+ /*
+ * The inode table, if we need to relocate it, is
+ * handled specially. We have to reserve the blocks
+ * for both the old and the new inode table, since we
+ * can't have the inode table be destroyed during the
+ * block relocation phase.
+ */
+ if (FS_INODE_TB(fs, i) == FS_INODE_TB(old_fs, i))
+ goto next_group; /* inode table not moved */
+
+ rfs->needed_blocks += fs->inode_blocks_per_group;
+
+ /*
+ * Mark the new inode table as in use in the new block
+ * allocation bitmap, and move any blocks that might
+ * be necessary.
+ */
for (blk = fs->group_desc[i].bg_inode_table, j=0;
- j < fs->inode_blocks_per_group ; j++, blk++)
+ j < fs->inode_blocks_per_group ; j++, blk++) {
ext2fs_mark_block_bitmap(fs->block_map, blk);
+ if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
+ !ext2fs_test_block_bitmap(meta_bmap, blk))
+ ext2fs_mark_block_bitmap(rfs->move_blocks,
+ blk);
+ }
/*
- * Mark the inode tables which will need to move, and
- * restore the old inode table location (for now)
+ * Make sure the old inode table is reserved in the
+ * block reservation bitmap.
*/
- if (fs->group_desc[i].bg_inode_table !=
- rfs->old_fs->group_desc[i].bg_inode_table) {
- rfs->move_itable[i] = fs->group_desc[i].bg_inode_table;
- fs->group_desc[i].bg_inode_table =
- rfs->old_fs->group_desc[i].bg_inode_table;
- }
+ for (blk = rfs->old_fs->group_desc[i].bg_inode_table, j=0;
+ j < fs->inode_blocks_per_group ; j++, blk++)
+ ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
next_group:
group_blk += rfs->new_fs->super->s_blocks_per_group;
}
-}
+ retval = 0;
+errout:
+ if (meta_bmap)
+ ext2fs_free_block_bitmap(meta_bmap);
+
+ return retval;
+}
/*
- * This is the top-level routine which does the dirty deed....
+ * This helper function tries to allocate a new block. We try to
+ * avoid hitting the original group descriptor blocks at least at
+ * first, since we want to make it possible to recover from a badly
+ * aborted resize operation as much as possible.
+ *
+ * In the future, I may further modify this routine to balance out
+ * where we get the new blocks across the various block groups.
+ * Ideally we would allocate blocks that corresponded with the block
+ * group of the containing inode, and keep contiguous blocks
+ * together. However, this very difficult to do efficiently, since we
+ * don't have the necessary information up front.
*/
-errcode_t resize_fs(ext2_filsys fs, blk_t new_size)
+
+#define AVOID_OLD 1
+#define DESPERATION 2
+
+static void init_block_alloc(ext2_resize_t rfs)
{
- ext2_resize_t rfs;
- errcode_t retval;
+ rfs->alloc_state = AVOID_OLD;
+ rfs->new_blk = rfs->new_fs->super->s_first_data_block;
+#if 0
+ /* HACK for testing */
+ if (rfs->new_fs->super->s_blocks_count >
+ rfs->old_fs->super->s_blocks_count)
+ rfs->new_blk = rfs->old_fs->super->s_blocks_count;
+#endif
+}
- retval = ext2fs_read_bitmaps(fs);
+static blk_t get_new_block(ext2_resize_t rfs)
+{
+ ext2_filsys fs = rfs->new_fs;
+
+ while (1) {
+ if (rfs->new_blk >= fs->super->s_blocks_count) {
+ if (rfs->alloc_state == DESPERATION)
+ return 0;
+
+#ifdef RESIZE2FS_DEBUG
+ if (rfs->flags & RESIZE_DEBUG_BMOVE)
+ printf("Going into desperation mode "
+ "for block allocations\n");
+#endif
+ rfs->alloc_state = DESPERATION;
+ rfs->new_blk = fs->super->s_first_data_block;
+ continue;
+ }
+ if (ext2fs_test_block_bitmap(fs->block_map, rfs->new_blk) ||
+ ext2fs_test_block_bitmap(rfs->reserve_blocks,
+ rfs->new_blk) ||
+ ((rfs->alloc_state == AVOID_OLD) &&
+ (rfs->new_blk < rfs->old_fs->super->s_blocks_count) &&
+ ext2fs_test_block_bitmap(rfs->old_fs->block_map,
+ rfs->new_blk))) {
+ rfs->new_blk++;
+ continue;
+ }
+ return rfs->new_blk;
+ }
+}
+
+static errcode_t block_mover(ext2_resize_t rfs)
+{
+ blk_t blk, old_blk, new_blk;
+ ext2_filsys fs = rfs->new_fs;
+ ext2_filsys old_fs = rfs->old_fs;
+ errcode_t retval;
+ int size, c;
+ int to_move, moved;
+ ext2_badblocks_list badblock_list = 0;
+ int bb_modified = 0;
+
+ retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
if (retval)
return retval;
-
+
+ new_blk = fs->super->s_first_data_block;
+ if (!rfs->itable_buf) {
+ retval = ext2fs_get_array(fs->blocksize,
+ fs->inode_blocks_per_group,
+ &rfs->itable_buf);
+ if (retval)
+ return retval;
+ }
+ retval = ext2fs_create_extent_table(&rfs->bmap, 0);
+ if (retval)
+ return retval;
+
/*
- * Create the data structure
+ * The first step is to figure out where all of the blocks
+ * will go.
*/
- rfs = malloc(sizeof(struct ext2_resize_struct));
- if (!rfs)
- return ENOMEM;
- memset(rfs, 0, sizeof(struct ext2_resize_struct));
+ to_move = moved = 0;
+ init_block_alloc(rfs);
+ for (blk = old_fs->super->s_first_data_block;
+ blk < old_fs->super->s_blocks_count; blk++) {
+ if (!ext2fs_test_block_bitmap(old_fs->block_map, blk))
+ continue;
+ if (!ext2fs_test_block_bitmap(rfs->move_blocks, blk))
+ continue;
+ if (ext2fs_badblocks_list_test(badblock_list, blk)) {
+ ext2fs_badblocks_list_del(badblock_list, blk);
+ bb_modified++;
+ continue;
+ }
- rfs->move_itable = malloc(sizeof(blk_t) * fs->group_desc_count);
- if (!rfs->move_itable) {
- retval = ENOMEM;
- goto errout;
+ new_blk = get_new_block(rfs);
+ if (!new_blk) {
+ retval = ENOSPC;
+ goto errout;
+ }
+ ext2fs_mark_block_bitmap(fs->block_map, new_blk);
+ ext2fs_add_extent_entry(rfs->bmap, blk, new_blk);
+ to_move++;
}
- memset(rfs->move_itable, 0, sizeof(blk_t) * fs->group_desc_count);
- rfs->old_fs = fs;
- retval = ext2fs_dup_handle(fs, &rfs->new_fs);
- if (retval)
+ if (to_move == 0) {
+ if (rfs->bmap) {
+ ext2fs_free_extent_table(rfs->bmap);
+ rfs->bmap = 0;
+ }
+ retval = 0;
goto errout;
+ }
- retval = adjust_superblock(rfs, new_size);
- if (retval)
- goto errout;
+ /*
+ * Step two is to actually move the blocks
+ */
+ retval = ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
+ if (retval) goto errout;
+
+ if (rfs->progress) {
+ retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
+ 0, to_move);
+ if (retval)
+ goto errout;
+ }
+ while (1) {
+ retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
+ if (retval) goto errout;
+ if (!size)
+ break;
+#ifdef RESIZE2FS_DEBUG
+ if (rfs->flags & RESIZE_DEBUG_BMOVE)
+ printf("Moving %d blocks %u->%u\n",
+ size, old_blk, new_blk);
+#endif
+ do {
+ c = size;
+ if (c > fs->inode_blocks_per_group)
+ c = fs->inode_blocks_per_group;
+ retval = io_channel_read_blk(fs->io, old_blk, c,
+ rfs->itable_buf);
+ if (retval) goto errout;
+ retval = io_channel_write_blk(fs->io, new_blk, c,
+ rfs->itable_buf);
+ if (retval) goto errout;
+ size -= c;
+ new_blk += c;
+ old_blk += c;
+ moved += c;
+ if (rfs->progress) {
+ io_channel_flush(fs->io);
+ retval = (rfs->progress)(rfs,
+ E2_RSZ_BLOCK_RELOC_PASS,
+ moved, to_move);
+ if (retval)
+ goto errout;
+ }
+ } while (size > 0);
+ io_channel_flush(fs->io);
+ }
+
+errout:
+ if (badblock_list) {
+ if (!retval && bb_modified)
+ retval = ext2fs_update_bb_inode(old_fs,
+ badblock_list);
+ ext2fs_badblocks_list_free(badblock_list);
+ }
+ return retval;
+}
+
+
+/* --------------------------------------------------------------------
+ *
+ * Resize processing, phase 3
+ *
+ * --------------------------------------------------------------------
+ */
+
+
+struct process_block_struct {
+ ext2_resize_t rfs;
+ ext2_ino_t ino;
+ struct ext2_inode * inode;
+ errcode_t error;
+ int is_dir;
+ int changed;
+};
+
+static int process_block(ext2_filsys fs, blk_t *block_nr,
+ e2_blkcnt_t blockcnt,
+ blk_t ref_block EXT2FS_ATTR((unused)),
+ int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
+{
+ struct process_block_struct *pb;
+ errcode_t retval;
+ blk_t block, new_block;
+ int ret = 0;
- retval = determine_relocations(rfs);
+ pb = (struct process_block_struct *) priv_data;
+ block = *block_nr;
+ if (pb->rfs->bmap) {
+ new_block = ext2fs_extent_translate(pb->rfs->bmap, block);
+ if (new_block) {
+ *block_nr = new_block;
+ ret |= BLOCK_CHANGED;
+ pb->changed = 1;
+#ifdef RESIZE2FS_DEBUG
+ if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
+ printf("ino=%u, blockcnt=%lld, %u->%u\n",
+ pb->ino, blockcnt, block, new_block);
+#endif
+ block = new_block;
+ }
+ }
+ if (pb->is_dir) {
+ retval = ext2fs_add_dir_block(fs->dblist, pb->ino,
+ block, (int) blockcnt);
+ if (retval) {
+ pb->error = retval;
+ ret |= BLOCK_ABORT;
+ }
+ }
+ return ret;
+}
+
+/*
+ * Progress callback
+ */
+static errcode_t progress_callback(ext2_filsys fs,
+ ext2_inode_scan scan EXT2FS_ATTR((unused)),
+ dgrp_t group, void * priv_data)
+{
+ ext2_resize_t rfs = (ext2_resize_t) priv_data;
+ errcode_t retval;
+
+ /*
+ * This check is to protect against old ext2 libraries. It
+ * shouldn't be needed against new libraries.
+ */
+ if ((group+1) == 0)
+ return 0;
+
+ if (rfs->progress) {
+ io_channel_flush(fs->io);
+ retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
+ group+1, fs->group_desc_count);
+ if (retval)
+ return retval;
+ }
+
+ return 0;
+}
+
+static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
+{
+ struct process_block_struct pb;
+ ext2_ino_t ino, new_inode;
+ struct ext2_inode inode;
+ ext2_inode_scan scan = NULL;
+ errcode_t retval;
+ int group;
+ char *block_buf = 0;
+ ext2_ino_t start_to_move;
+ blk_t orig_size, new_block;
+
+ if ((rfs->old_fs->group_desc_count <=
+ rfs->new_fs->group_desc_count) &&
+ !rfs->bmap)
+ return 0;
+
+ /*
+ * Save the original size of the old filesystem, and
+ * temporarily set the size to be the new size if the new size
+ * is larger. We need to do this to avoid catching an error
+ * by the block iterator routines
+ */
+ orig_size = rfs->old_fs->super->s_blocks_count;
+ if (orig_size < rfs->new_fs->super->s_blocks_count)
+ rfs->old_fs->super->s_blocks_count =
+ rfs->new_fs->super->s_blocks_count;
+
+ retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
+ if (retval) goto errout;
+
+ retval = ext2fs_init_dblist(rfs->old_fs, 0);
+ if (retval) goto errout;
+ retval = ext2fs_get_array(rfs->old_fs->blocksize, 3, &block_buf);
+ if (retval) goto errout;
+
+ start_to_move = (rfs->new_fs->group_desc_count *
+ rfs->new_fs->super->s_inodes_per_group);
+
+ if (rfs->progress) {
+ retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
+ 0, rfs->old_fs->group_desc_count);
+ if (retval)
+ goto errout;
+ }
+ ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
+ pb.rfs = rfs;
+ pb.inode = &inode;
+ pb.error = 0;
+ new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
+ /*
+ * First, copy all of the inodes that need to be moved
+ * elsewhere in the inode table
+ */
+ while (1) {
+ retval = ext2fs_get_next_inode(scan, &ino, &inode);
+ if (retval) goto errout;
+ if (!ino)
+ break;
+
+ if (inode.i_links_count == 0 && ino != EXT2_RESIZE_INO)
+ continue; /* inode not in use */
+
+ pb.is_dir = LINUX_S_ISDIR(inode.i_mode);
+ pb.changed = 0;
+
+ if (inode.i_file_acl && rfs->bmap) {
+ new_block = ext2fs_extent_translate(rfs->bmap,
+ inode.i_file_acl);
+ if (new_block) {
+ inode.i_file_acl = new_block;
+ retval = ext2fs_write_inode(rfs->old_fs,
+ ino, &inode);
+ if (retval) goto errout;
+ }
+ }
+
+ if (ext2fs_inode_has_valid_blocks(&inode) &&
+ (rfs->bmap || pb.is_dir)) {
+ pb.ino = ino;
+ retval = ext2fs_block_iterate2(rfs->old_fs,
+ ino, 0, block_buf,
+ process_block, &pb);
+ if (retval)
+ goto errout;
+ if (pb.error) {
+ retval = pb.error;
+ goto errout;
+ }
+ }
+
+ if (ino <= start_to_move)
+ continue; /* Don't need to move it. */
+
+ /*
+ * Find a new inode
+ */
+ while (1) {
+ if (!ext2fs_test_inode_bitmap(rfs->new_fs->inode_map,
+ new_inode))
+ break;
+ new_inode++;
+ if (new_inode > rfs->new_fs->super->s_inodes_count) {
+ retval = ENOSPC;
+ goto errout;
+ }
+ }
+ ext2fs_mark_inode_bitmap(rfs->new_fs->inode_map, new_inode);
+ if (pb.changed) {
+ /* Get the new version of the inode */
+ retval = ext2fs_read_inode(rfs->old_fs, ino, &inode);
+ if (retval) goto errout;
+ }
+ inode.i_ctime = time(0);
+ retval = ext2fs_write_inode(rfs->old_fs, new_inode, &inode);
+ if (retval) goto errout;
+
+ group = (new_inode-1) / EXT2_INODES_PER_GROUP(rfs->new_fs->super);
+ if (LINUX_S_ISDIR(inode.i_mode))
+ rfs->new_fs->group_desc[group].bg_used_dirs_count++;
+
+#ifdef RESIZE2FS_DEBUG
+ if (rfs->flags & RESIZE_DEBUG_INODEMAP)
+ printf("Inode moved %u->%u\n", ino, new_inode);
+#endif
+ if (!rfs->imap) {
+ retval = ext2fs_create_extent_table(&rfs->imap, 0);
+ if (retval)
+ goto errout;
+ }
+ ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
+ }
+ io_channel_flush(rfs->old_fs->io);
+
+errout:
+ rfs->old_fs->super->s_blocks_count = orig_size;
+ if (rfs->bmap) {
+ ext2fs_free_extent_table(rfs->bmap);
+ rfs->bmap = 0;
+ }
+ if (scan)
+ ext2fs_close_inode_scan(scan);
+ if (block_buf)
+ ext2fs_free_mem(&block_buf);
+ return retval;
+}
+
+/* --------------------------------------------------------------------
+ *
+ * Resize processing, phase 4.
+ *
+ * --------------------------------------------------------------------
+ */
+
+struct istruct {
+ ext2_resize_t rfs;
+ errcode_t err;
+ unsigned long max_dirs;
+ int num;
+};
+
+static int check_and_change_inodes(ext2_ino_t dir,
+ int entry EXT2FS_ATTR((unused)),
+ struct ext2_dir_entry *dirent, int offset,
+ int blocksize EXT2FS_ATTR((unused)),
+ char *buf EXT2FS_ATTR((unused)),
+ void *priv_data)
+{
+ struct istruct *is = (struct istruct *) priv_data;
+ struct ext2_inode inode;
+ ext2_ino_t new_inode;
+ errcode_t retval;
+
+ if (is->rfs->progress && offset == 0) {
+ io_channel_flush(is->rfs->old_fs->io);
+ is->err = (is->rfs->progress)(is->rfs,
+ E2_RSZ_INODE_REF_UPD_PASS,
+ ++is->num, is->max_dirs);
+ if (is->err)
+ return DIRENT_ABORT;
+ }
+
+ if (!dirent->inode)
+ return 0;
+
+ new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
+
+ if (!new_inode)
+ return 0;
+#ifdef RESIZE2FS_DEBUG
+ if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
+ printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
+ dir, dirent->name_len&0xFF, dirent->name,
+ dirent->inode, new_inode);
+#endif
+
+ dirent->inode = new_inode;
+
+ /* Update the directory mtime and ctime */
+ retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
+ if (retval == 0) {
+ inode.i_mtime = inode.i_ctime = time(0);
+ is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
+ if (is->err)
+ return DIRENT_ABORT;
+ }
+
+ return DIRENT_CHANGED;
+}
+
+static errcode_t inode_ref_fix(ext2_resize_t rfs)
+{
+ errcode_t retval;
+ struct istruct is;
+
+ if (!rfs->imap)
+ return 0;
+
+ /*
+ * Now, we iterate over all of the directories to update the
+ * inode references
+ */
+ is.num = 0;
+ is.max_dirs = ext2fs_dblist_count(rfs->old_fs->dblist);
+ is.rfs = rfs;
+ is.err = 0;
+
+ if (rfs->progress) {
+ retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
+ 0, is.max_dirs);
+ if (retval)
+ goto errout;
+ }
+
+ retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
+ DIRENT_FLAG_INCLUDE_EMPTY, 0,
+ check_and_change_inodes, &is);
if (retval)
goto errout;
+ if (is.err) {
+ retval = is.err;
+ goto errout;
+ }
- printf("\nOld superblock:\n");
- list_super(rfs->old_fs->super);
- printf("\n\nNew superblock:\n");
- list_super(rfs->new_fs->super);
- printf("\n");
+errout:
+ ext2fs_free_extent_table(rfs->imap);
+ rfs->imap = 0;
+ return retval;
+}
- retval = ext2fs_move_blocks(rfs->old_fs, rfs->reserve_blocks,
- EXT2_BMOVE_GET_DBLIST);
- retval = ext2fs_close(rfs->new_fs);
- if (retval)
- return retval;
+/* --------------------------------------------------------------------
+ *
+ * Resize processing, phase 5.
+ *
+ * In this phase we actually move the inode table around, and then
+ * update the summary statistics. This is scary, since aborting here
+ * will potentially scramble the filesystem. (We are moving the
+ * inode tables around in place, and so the potential for lost data,
+ * or at the very least scrambling the mapping between filenames and
+ * inode numbers is very high in case of a power failure here.)
+ * --------------------------------------------------------------------
+ */
+
+
+/*
+ * A very scary routine --- this one moves the inode table around!!!
+ *
+ * After this you have to use the rfs->new_fs file handle to read and
+ * write inodes.
+ */
+static errcode_t move_itables(ext2_resize_t rfs)
+{
+ int n, num, size, diff;
+ dgrp_t i, max_groups;
+ ext2_filsys fs = rfs->new_fs;
+ char *cp;
+ blk_t old_blk, new_blk, blk;
+ errcode_t retval;
+ int j, to_move, moved;
+
+ max_groups = fs->group_desc_count;
+ if (max_groups > rfs->old_fs->group_desc_count)
+ max_groups = rfs->old_fs->group_desc_count;
+
+ size = fs->blocksize * fs->inode_blocks_per_group;
+ if (!rfs->itable_buf) {
+ retval = ext2fs_get_mem(size, &rfs->itable_buf);
+ if (retval)
+ return retval;
+ }
+
+ /*
+ * Figure out how many inode tables we need to move
+ */
+ to_move = moved = 0;
+ for (i=0; i < max_groups; i++)
+ if (rfs->old_fs->group_desc[i].bg_inode_table !=
+ fs->group_desc[i].bg_inode_table)
+ to_move++;
+
+ if (to_move == 0)
+ return 0;
+
+ if (rfs->progress) {
+ retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
+ 0, to_move);
+ if (retval)
+ goto errout;
+ }
+
+ rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
+
+ for (i=0; i < max_groups; i++) {
+ old_blk = rfs->old_fs->group_desc[i].bg_inode_table;
+ new_blk = fs->group_desc[i].bg_inode_table;
+ diff = new_blk - old_blk;
+
+#ifdef RESIZE2FS_DEBUG
+ if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
+ printf("Itable move group %d block %u->%u (diff %d)\n",
+ i, old_blk, new_blk, diff);
+#endif
+
+ if (!diff)
+ continue;
+
+ retval = io_channel_read_blk(fs->io, old_blk,
+ fs->inode_blocks_per_group,
+ rfs->itable_buf);
+ if (retval)
+ goto errout;
+ /*
+ * The end of the inode table segment often contains
+ * all zeros, and we're often only moving the inode
+ * table down a block or two. If so, we can optimize
+ * things by not rewriting blocks that we know to be zero
+ * already.
+ */
+ for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
+ if (*cp)
+ break;
+ n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
+#ifdef RESIZE2FS_DEBUG
+ if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
+ printf("%d blocks of zeros...\n", n);
+#endif
+ num = fs->inode_blocks_per_group;
+ if (n > diff)
+ num -= n;
+
+ retval = io_channel_write_blk(fs->io, new_blk,
+ num, rfs->itable_buf);
+ if (retval) {
+ io_channel_write_blk(fs->io, old_blk,
+ num, rfs->itable_buf);
+ goto errout;
+ }
+ if (n > diff) {
+ retval = io_channel_write_blk(fs->io,
+ old_blk + fs->inode_blocks_per_group,
+ diff, (rfs->itable_buf +
+ (fs->inode_blocks_per_group - diff) *
+ fs->blocksize));
+ if (retval)
+ goto errout;
+ }
+
+ for (blk = rfs->old_fs->group_desc[i].bg_inode_table, j=0;
+ j < fs->inode_blocks_per_group ; j++, blk++)
+ ext2fs_unmark_block_bitmap(fs->block_map, blk);
+
+ rfs->old_fs->group_desc[i].bg_inode_table = new_blk;
+ ext2fs_mark_super_dirty(rfs->old_fs);
+ ext2fs_flush(rfs->old_fs);
+
+ if (rfs->progress) {
+ retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
+ ++moved, to_move);
+ if (retval)
+ goto errout;
+ }
+ }
+ mark_table_blocks(fs, fs->block_map);
+ ext2fs_flush(fs);
+#ifdef RESIZE2FS_DEBUG
+ if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
+ printf("Inode table move finished.\n");
+#endif
+ return 0;
- ext2fs_free(rfs->old_fs);
+errout:
+ return retval;
+}
+
+/*
+ * Fix the resize inode
+ */
+static errcode_t fix_resize_inode(ext2_filsys fs)
+{
+ struct ext2_inode inode;
+ errcode_t retval;
+ char * block_buf;
+
+ if (!(fs->super->s_feature_compat &
+ EXT2_FEATURE_COMPAT_RESIZE_INODE))
+ return 0;
+
+ retval = ext2fs_get_mem(fs->blocksize, &block_buf);
+ if (retval) goto errout;
+
+ retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
+ if (retval) goto errout;
+
+ inode.i_blocks = fs->blocksize/512;
+
+ retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
+ if (retval) goto errout;
+
+ if (!inode.i_block[EXT2_DIND_BLOCK]) {
+ /*
+ * Avoid zeroing out block #0; that's rude. This
+ * should never happen anyway since the filesystem
+ * should be fsck'ed and we assume it is consistent.
+ */
+ fprintf(stderr,
+ _("Should never happen: resize inode corrupt!\n"));
+ exit(1);
+ }
+
+ memset(block_buf, 0, fs->blocksize);
+
+ retval = io_channel_write_blk(fs->io, inode.i_block[EXT2_DIND_BLOCK],
+ 1, block_buf);
+ if (retval) goto errout;
- return 0;
+ retval = ext2fs_create_resize_inode(fs);
+ if (retval)
+ goto errout;
errout:
- if (rfs->move_itable)
- free(rfs->move_itable);
- if (rfs->new_fs)
- ext2fs_free(rfs->new_fs);
- free(rfs);
+ if (block_buf)
+ ext2fs_free_mem(&block_buf);
return retval;
}
+/*
+ * Finally, recalculate the summary information
+ */
+static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs)
+{
+ blk_t blk;
+ ext2_ino_t ino;
+ unsigned int group = 0;
+ unsigned int count = 0;
+ int total_free = 0;
+ int group_free = 0;
+
+ /*
+ * First calculate the block statistics
+ */
+ for (blk = fs->super->s_first_data_block;
+ blk < fs->super->s_blocks_count; blk++) {
+ if (!ext2fs_fast_test_block_bitmap(fs->block_map, blk)) {
+ group_free++;
+ total_free++;
+ }
+ count++;
+ if ((count == fs->super->s_blocks_per_group) ||
+ (blk == fs->super->s_blocks_count-1)) {
+ fs->group_desc[group++].bg_free_blocks_count =
+ group_free;
+ count = 0;
+ group_free = 0;
+ }
+ }
+ fs->super->s_free_blocks_count = total_free;
+
+ /*
+ * Next, calculate the inode statistics
+ */
+ group_free = 0;
+ total_free = 0;
+ count = 0;
+ group = 0;
+
+ /* Protect loop from wrap-around if s_inodes_count maxed */
+ for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
+ if (!ext2fs_fast_test_inode_bitmap(fs->inode_map, ino)) {
+ group_free++;
+ total_free++;
+ }
+ count++;
+ if ((count == fs->super->s_inodes_per_group) ||
+ (ino == fs->super->s_inodes_count)) {
+ fs->group_desc[group++].bg_free_inodes_count =
+ group_free;
+ count = 0;
+ group_free = 0;
+ }
+ }
+ fs->super->s_free_inodes_count = total_free;
+ ext2fs_mark_super_dirty(fs);
+ return 0;
+}
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff