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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:49:25 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:49:25 +0000
commit464df1d5e5ab1322e2dd0a7796939fff1aeefa9a (patch)
tree6a403684e0978f0287d7f0ec0e5aab1fd31a59e1 /resize/resize2fs.c
parentInitial commit. (diff)
downloade2fsprogs-upstream/1.47.0.tar.xz
e2fsprogs-upstream/1.47.0.zip
Adding upstream version 1.47.0.upstream/1.47.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'resize/resize2fs.c')
-rw-r--r--resize/resize2fs.c3235
1 files changed, 3235 insertions, 0 deletions
diff --git a/resize/resize2fs.c b/resize/resize2fs.c
new file mode 100644
index 0000000..5eeb7d4
--- /dev/null
+++ b/resize/resize2fs.c
@@ -0,0 +1,3235 @@
+/*
+ * resize2fs.c --- ext2 main routine
+ *
+ * Copyright (C) 1997, 1998 by Theodore Ts'o and
+ * PowerQuest, Inc.
+ *
+ * Copyright (C) 1999, 2000 by Theodore Ts'o
+ *
+ * %Begin-Header%
+ * 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 "config.h"
+#include "resize2fs.h"
+#include <time.h>
+
+#ifdef __linux__ /* Kludge for debugging */
+#define RESIZE2FS_DEBUG
+#endif
+
+static void fix_uninit_block_bitmaps(ext2_filsys fs);
+static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_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 resize2fs_calculate_summary_stats(ext2_filsys fs);
+static errcode_t fix_sb_journal_backup(ext2_filsys fs);
+static errcode_t mark_table_blocks(ext2_filsys fs,
+ ext2fs_block_bitmap bmap);
+static errcode_t clear_sparse_super2_last_group(ext2_resize_t rfs);
+static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
+ ext2fs_block_bitmap meta_bmap);
+static errcode_t resize_group_descriptors(ext2_resize_t rfs, blk64_t new_size);
+static errcode_t move_bg_metadata(ext2_resize_t rfs);
+static errcode_t zero_high_bits_in_inodes(ext2_resize_t rfs);
+
+/*
+ * Some helper functions to check if a block is in a metadata area
+ */
+static inline int is_block_bm(ext2_filsys fs, unsigned int grp, blk64_t blk)
+{
+ return blk == ext2fs_block_bitmap_loc(fs, grp);
+}
+
+static inline int is_inode_bm(ext2_filsys fs, unsigned int grp, blk64_t blk)
+{
+ return blk == ext2fs_inode_bitmap_loc(fs, grp);
+}
+
+static int is_inode_tb(ext2_filsys fs, unsigned int grp, blk64_t blk)
+{
+ return blk >= ext2fs_inode_table_loc(fs, grp) &&
+ blk < (ext2fs_inode_table_loc(fs, grp) +
+ fs->inode_blocks_per_group);
+}
+
+/* Some bigalloc helper macros which are more succinct... */
+#define B2C(x) EXT2FS_B2C(fs, (x))
+#define C2B(x) EXT2FS_C2B(fs, (x))
+#define EQ_CLSTR(x, y) (B2C(x) == B2C(y))
+#define LE_CLSTR(x, y) (B2C(x) <= B2C(y))
+#define LT_CLSTR(x, y) (B2C(x) < B2C(y))
+#define GE_CLSTR(x, y) (B2C(x) >= B2C(y))
+#define GT_CLSTR(x, y) (B2C(x) > B2C(y))
+
+static int lazy_itable_init;
+
+/*
+ * This is the top-level routine which does the dirty deed....
+ */
+errcode_t resize_fs(ext2_filsys fs, blk64_t *new_size, int flags,
+ errcode_t (*progress)(ext2_resize_t rfs, int pass,
+ unsigned long cur,
+ unsigned long max_val))
+{
+ ext2_resize_t rfs;
+ errcode_t retval;
+ struct resource_track rtrack, overall_track;
+
+ /*
+ * 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));
+ fs->priv_data = rfs;
+ rfs->old_fs = fs;
+ rfs->flags = flags;
+ rfs->itable_buf = 0;
+ rfs->progress = progress;
+
+ init_resource_track(&overall_track, "overall resize2fs", fs->io);
+ init_resource_track(&rtrack, "read_bitmaps", fs->io);
+ retval = ext2fs_read_bitmaps(fs);
+ if (retval)
+ goto errout;
+ print_resource_track(rfs, &rtrack, fs->io);
+
+ fs->super->s_state |= EXT2_ERROR_FS;
+ ext2fs_mark_super_dirty(fs);
+ ext2fs_flush(fs);
+
+ init_resource_track(&rtrack, "fix_uninit_block_bitmaps 1", fs->io);
+ fix_uninit_block_bitmaps(fs);
+ print_resource_track(rfs, &rtrack, fs->io);
+ retval = ext2fs_dup_handle(fs, &rfs->new_fs);
+ if (retval)
+ goto errout;
+
+ init_resource_track(&rtrack, "resize_group_descriptors", fs->io);
+ retval = resize_group_descriptors(rfs, *new_size);
+ if (retval)
+ goto errout;
+ print_resource_track(rfs, &rtrack, fs->io);
+
+ init_resource_track(&rtrack, "move_bg_metadata", fs->io);
+ retval = move_bg_metadata(rfs);
+ if (retval)
+ goto errout;
+ print_resource_track(rfs, &rtrack, fs->io);
+
+ init_resource_track(&rtrack, "zero_high_bits_in_metadata", fs->io);
+ retval = zero_high_bits_in_inodes(rfs);
+ if (retval)
+ goto errout;
+ print_resource_track(rfs, &rtrack, fs->io);
+
+ init_resource_track(&rtrack, "adjust_superblock", fs->io);
+ retval = adjust_superblock(rfs, *new_size);
+ if (retval)
+ goto errout;
+ print_resource_track(rfs, &rtrack, fs->io);
+
+ init_resource_track(&rtrack, "fix_uninit_block_bitmaps 2", fs->io);
+ fix_uninit_block_bitmaps(rfs->new_fs);
+ print_resource_track(rfs, &rtrack, fs->io);
+ /* Clear the block bitmap uninit flag for the last block group */
+ ext2fs_bg_flags_clear(rfs->new_fs, rfs->new_fs->group_desc_count - 1,
+ EXT2_BG_BLOCK_UNINIT);
+
+ *new_size = ext2fs_blocks_count(rfs->new_fs->super);
+
+ init_resource_track(&rtrack, "blocks_to_move", fs->io);
+ retval = blocks_to_move(rfs);
+ if (retval)
+ goto errout;
+ print_resource_track(rfs, &rtrack, fs->io);
+
+#ifdef RESIZE2FS_DEBUG
+ if (rfs->flags & RESIZE_DEBUG_BMOVE)
+ printf("Number of free blocks: %llu/%llu, Needed: %llu\n",
+ (unsigned long long) ext2fs_free_blocks_count(rfs->old_fs->super),
+ (unsigned long long) ext2fs_free_blocks_count(rfs->new_fs->super),
+ (unsigned long long) rfs->needed_blocks);
+#endif
+
+ init_resource_track(&rtrack, "block_mover", fs->io);
+ retval = block_mover(rfs);
+ if (retval)
+ goto errout;
+ print_resource_track(rfs, &rtrack, fs->io);
+
+ init_resource_track(&rtrack, "inode_scan_and_fix", fs->io);
+ retval = inode_scan_and_fix(rfs);
+ if (retval)
+ goto errout;
+ print_resource_track(rfs, &rtrack, fs->io);
+
+ init_resource_track(&rtrack, "inode_ref_fix", fs->io);
+ retval = inode_ref_fix(rfs);
+ if (retval)
+ goto errout;
+ print_resource_track(rfs, &rtrack, fs->io);
+
+ init_resource_track(&rtrack, "move_itables", fs->io);
+ retval = move_itables(rfs);
+ if (retval)
+ goto errout;
+ print_resource_track(rfs, &rtrack, fs->io);
+
+ retval = clear_sparse_super2_last_group(rfs);
+ if (retval)
+ goto errout;
+
+ init_resource_track(&rtrack, "calculate_summary_stats", fs->io);
+ retval = resize2fs_calculate_summary_stats(rfs->new_fs);
+ if (retval)
+ goto errout;
+ print_resource_track(rfs, &rtrack, fs->io);
+
+ init_resource_track(&rtrack, "fix_resize_inode", fs->io);
+ retval = fix_resize_inode(rfs->new_fs);
+ if (retval)
+ goto errout;
+ print_resource_track(rfs, &rtrack, fs->io);
+
+ init_resource_track(&rtrack, "fix_sb_journal_backup", fs->io);
+ retval = fix_sb_journal_backup(rfs->new_fs);
+ if (retval)
+ goto errout;
+ print_resource_track(rfs, &rtrack, fs->io);
+
+ retval = ext2fs_set_gdt_csum(rfs->new_fs);
+ if (retval)
+ goto errout;
+
+ rfs->new_fs->super->s_state &= ~EXT2_ERROR_FS;
+ rfs->new_fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
+
+ print_resource_track(rfs, &overall_track, fs->io);
+ retval = ext2fs_close_free(&rfs->new_fs);
+ if (retval)
+ goto errout;
+
+ rfs->flags = flags;
+
+ ext2fs_free(rfs->old_fs);
+ rfs->old_fs = NULL;
+ if (rfs->itable_buf)
+ ext2fs_free_mem(&rfs->itable_buf);
+ if (rfs->reserve_blocks)
+ ext2fs_free_block_bitmap(rfs->reserve_blocks);
+ if (rfs->move_blocks)
+ ext2fs_free_block_bitmap(rfs->move_blocks);
+ ext2fs_free_mem(&rfs);
+
+ return 0;
+
+errout:
+ if (rfs->new_fs) {
+ ext2fs_free(rfs->new_fs);
+ rfs->new_fs = NULL;
+ }
+ if (rfs->itable_buf)
+ ext2fs_free_mem(&rfs->itable_buf);
+ ext2fs_free_mem(&rfs);
+ return retval;
+}
+
+/* Keep the size of the group descriptor region constant */
+static void adjust_reserved_gdt_blocks(ext2_filsys old_fs, ext2_filsys fs)
+{
+ if (ext2fs_has_feature_resize_inode(fs->super) &&
+ (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;
+ }
+}
+
+/* Toggle 64bit mode */
+static errcode_t resize_group_descriptors(ext2_resize_t rfs, blk64_t new_size)
+{
+ void *o, *n, *new_group_desc;
+ dgrp_t i;
+ int copy_size;
+ errcode_t retval;
+
+ if (!(rfs->flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)))
+ return 0;
+
+ if (new_size != ext2fs_blocks_count(rfs->new_fs->super) ||
+ ext2fs_blocks_count(rfs->new_fs->super) >= (1ULL << 32) ||
+ (rfs->flags & RESIZE_DISABLE_64BIT &&
+ rfs->flags & RESIZE_ENABLE_64BIT))
+ return EXT2_ET_INVALID_ARGUMENT;
+
+ if (rfs->flags & RESIZE_DISABLE_64BIT) {
+ ext2fs_clear_feature_64bit(rfs->new_fs->super);
+ rfs->new_fs->super->s_desc_size = EXT2_MIN_DESC_SIZE;
+ } else if (rfs->flags & RESIZE_ENABLE_64BIT) {
+ ext2fs_set_feature_64bit(rfs->new_fs->super);
+ rfs->new_fs->super->s_desc_size = EXT2_MIN_DESC_SIZE_64BIT;
+ }
+
+ if (EXT2_DESC_SIZE(rfs->old_fs->super) ==
+ EXT2_DESC_SIZE(rfs->new_fs->super))
+ return 0;
+
+ o = rfs->new_fs->group_desc;
+ rfs->new_fs->desc_blocks = ext2fs_div_ceil(
+ rfs->old_fs->group_desc_count,
+ EXT2_DESC_PER_BLOCK(rfs->new_fs->super));
+ retval = ext2fs_get_arrayzero(rfs->new_fs->desc_blocks,
+ rfs->old_fs->blocksize, &new_group_desc);
+ if (retval)
+ return retval;
+
+ n = new_group_desc;
+
+ if (EXT2_DESC_SIZE(rfs->old_fs->super) <=
+ EXT2_DESC_SIZE(rfs->new_fs->super))
+ copy_size = EXT2_DESC_SIZE(rfs->old_fs->super);
+ else
+ copy_size = EXT2_DESC_SIZE(rfs->new_fs->super);
+ for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
+ memcpy(n, o, copy_size);
+ n = (char *)n + EXT2_DESC_SIZE(rfs->new_fs->super);
+ o = (char *)o + EXT2_DESC_SIZE(rfs->old_fs->super);
+ }
+
+ ext2fs_free_mem(&rfs->new_fs->group_desc);
+ rfs->new_fs->group_desc = new_group_desc;
+
+ for (i = 0; i < rfs->old_fs->group_desc_count; i++)
+ ext2fs_group_desc_csum_set(rfs->new_fs, i);
+
+ adjust_reserved_gdt_blocks(rfs->old_fs, rfs->new_fs);
+
+ return 0;
+}
+
+/* Move bitmaps/inode tables out of the way. */
+static errcode_t move_bg_metadata(ext2_resize_t rfs)
+{
+ dgrp_t i;
+ blk64_t b, c, d, old_desc_blocks, new_desc_blocks, j;
+ ext2fs_block_bitmap old_map, new_map;
+ int old, new;
+ errcode_t retval;
+ int cluster_ratio;
+
+ if (!(rfs->flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)))
+ return 0;
+
+ retval = ext2fs_allocate_block_bitmap(rfs->old_fs, "oldfs", &old_map);
+ if (retval)
+ return retval;
+
+ retval = ext2fs_allocate_block_bitmap(rfs->new_fs, "newfs", &new_map);
+ if (retval)
+ goto out;
+
+ if (ext2fs_has_feature_meta_bg(rfs->old_fs->super)) {
+ old_desc_blocks = rfs->old_fs->super->s_first_meta_bg;
+ new_desc_blocks = rfs->new_fs->super->s_first_meta_bg;
+ } else {
+ old_desc_blocks = rfs->old_fs->desc_blocks +
+ rfs->old_fs->super->s_reserved_gdt_blocks;
+ new_desc_blocks = rfs->new_fs->desc_blocks +
+ rfs->new_fs->super->s_reserved_gdt_blocks;
+ }
+
+ /* Construct bitmaps of super/descriptor blocks in old and new fs */
+ for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
+ retval = ext2fs_super_and_bgd_loc2(rfs->old_fs, i, &b, &c, &d,
+ NULL);
+ if (retval)
+ goto out;
+ if (b)
+ ext2fs_mark_block_bitmap2(old_map, b);
+ for (j = 0; c != 0 && j < old_desc_blocks; j++)
+ ext2fs_mark_block_bitmap2(old_map, c + j);
+ if (d)
+ ext2fs_mark_block_bitmap2(old_map, d);
+
+ retval = ext2fs_super_and_bgd_loc2(rfs->new_fs, i, &b, &c, &d,
+ NULL);
+ if (retval)
+ goto out;
+ if (b)
+ ext2fs_mark_block_bitmap2(new_map, b);
+ for (j = 0; c != 0 && j < new_desc_blocks; j++)
+ ext2fs_mark_block_bitmap2(new_map, c + j);
+ if (d)
+ ext2fs_mark_block_bitmap2(new_map, d);
+ }
+
+ cluster_ratio = EXT2FS_CLUSTER_RATIO(rfs->new_fs);
+
+ /* Find changes in block allocations for bg metadata */
+ for (b = EXT2FS_B2C(rfs->old_fs,
+ rfs->old_fs->super->s_first_data_block);
+ b < ext2fs_blocks_count(rfs->new_fs->super);
+ b += cluster_ratio) {
+ old = ext2fs_test_block_bitmap2(old_map, b);
+ new = ext2fs_test_block_bitmap2(new_map, b);
+
+ if (old && !new) {
+ /* mark old_map, unmark new_map */
+ if (cluster_ratio == 1)
+ ext2fs_unmark_block_bitmap2(
+ rfs->new_fs->block_map, b);
+ } else if (!old && new)
+ ; /* unmark old_map, mark new_map */
+ else {
+ ext2fs_unmark_block_bitmap2(old_map, b);
+ ext2fs_unmark_block_bitmap2(new_map, b);
+ }
+ }
+
+ /*
+ * new_map now shows blocks that have been newly allocated.
+ * old_map now shows blocks that have been newly freed.
+ */
+
+ /*
+ * Move any conflicting bitmaps and inode tables. Ensure that we
+ * don't try to free clusters associated with bitmaps or tables.
+ */
+ for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
+ b = ext2fs_block_bitmap_loc(rfs->new_fs, i);
+ if (ext2fs_test_block_bitmap2(new_map, b))
+ ext2fs_block_bitmap_loc_set(rfs->new_fs, i, 0);
+ else if (ext2fs_test_block_bitmap2(old_map, b))
+ ext2fs_unmark_block_bitmap2(old_map, b);
+
+ b = ext2fs_inode_bitmap_loc(rfs->new_fs, i);
+ if (ext2fs_test_block_bitmap2(new_map, b))
+ ext2fs_inode_bitmap_loc_set(rfs->new_fs, i, 0);
+ else if (ext2fs_test_block_bitmap2(old_map, b))
+ ext2fs_unmark_block_bitmap2(old_map, b);
+
+ c = ext2fs_inode_table_loc(rfs->new_fs, i);
+ for (b = 0;
+ b < rfs->new_fs->inode_blocks_per_group;
+ b++) {
+ if (ext2fs_test_block_bitmap2(new_map, b + c))
+ ext2fs_inode_table_loc_set(rfs->new_fs, i, 0);
+ else if (ext2fs_test_block_bitmap2(old_map, b + c))
+ ext2fs_unmark_block_bitmap2(old_map, b + c);
+ }
+ }
+
+ /* Free unused clusters */
+ for (b = 0;
+ cluster_ratio > 1 && b < ext2fs_blocks_count(rfs->new_fs->super);
+ b += cluster_ratio)
+ if (ext2fs_test_block_bitmap2(old_map, b))
+ ext2fs_unmark_block_bitmap2(rfs->new_fs->block_map, b);
+out:
+ if (old_map)
+ ext2fs_free_block_bitmap(old_map);
+ if (new_map)
+ ext2fs_free_block_bitmap(new_map);
+ return retval;
+}
+
+/* Zero out the high bits of extent fields */
+static errcode_t zero_high_bits_in_extents(ext2_filsys fs, ext2_ino_t ino,
+ struct ext2_inode *inode)
+{
+ ext2_extent_handle_t handle;
+ struct ext2fs_extent extent;
+ int op = EXT2_EXTENT_ROOT;
+ errcode_t errcode;
+
+ if (!(inode->i_flags & EXT4_EXTENTS_FL))
+ return 0;
+
+ errcode = ext2fs_extent_open(fs, ino, &handle);
+ if (errcode)
+ return errcode;
+
+ while (1) {
+ errcode = ext2fs_extent_get(handle, op, &extent);
+ if (errcode)
+ break;
+
+ op = EXT2_EXTENT_NEXT_SIB;
+
+ if (extent.e_pblk > (1ULL << 32)) {
+ extent.e_pblk &= (1ULL << 32) - 1;
+ errcode = ext2fs_extent_replace(handle, 0, &extent);
+ if (errcode)
+ break;
+ }
+ }
+
+ /* Ok if we run off the end */
+ if (errcode == EXT2_ET_EXTENT_NO_NEXT)
+ errcode = 0;
+ ext2fs_extent_free(handle);
+ return errcode;
+}
+
+/* Zero out the high bits of inodes. */
+static errcode_t zero_high_bits_in_inodes(ext2_resize_t rfs)
+{
+ ext2_filsys fs = rfs->old_fs;
+ int length = EXT2_INODE_SIZE(fs->super);
+ struct ext2_inode *inode = NULL;
+ ext2_inode_scan scan = NULL;
+ errcode_t retval;
+ ext2_ino_t ino;
+
+ if (!(rfs->flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)))
+ return 0;
+
+ if (fs->super->s_creator_os == EXT2_OS_HURD)
+ return 0;
+
+ retval = ext2fs_open_inode_scan(fs, 0, &scan);
+ if (retval)
+ return retval;
+
+ retval = ext2fs_get_mem(length, &inode);
+ if (retval)
+ goto out;
+
+ do {
+ retval = ext2fs_get_next_inode_full(scan, &ino, inode, length);
+ if (retval)
+ goto out;
+ if (!ino)
+ break;
+ if (!ext2fs_test_inode_bitmap2(fs->inode_map, ino))
+ continue;
+
+ /*
+ * Here's how we deal with high block number fields:
+ *
+ * - i_size_high has been been written out with i_size_lo
+ * since the ext2 days, so no conversion is needed.
+ *
+ * - i_blocks_hi is guarded by both the huge_file feature and
+ * inode flags and has always been written out with
+ * i_blocks_lo if the feature is set. The field is only
+ * ever read if both feature and inode flag are set, so
+ * we don't need to zero it now.
+ *
+ * - i_file_acl_high can be uninitialized, so zero it if
+ * it isn't already.
+ */
+ if (inode->osd2.linux2.l_i_file_acl_high) {
+ inode->osd2.linux2.l_i_file_acl_high = 0;
+ retval = ext2fs_write_inode_full(fs, ino, inode,
+ length);
+ if (retval)
+ goto out;
+ }
+
+ retval = zero_high_bits_in_extents(fs, ino, inode);
+ if (retval)
+ goto out;
+ } while (ino);
+
+out:
+ if (inode)
+ ext2fs_free_mem(&inode);
+ if (scan)
+ ext2fs_close_inode_scan(scan);
+ return retval;
+}
+
+/*
+ * Clean up the bitmaps for uninitialized bitmaps
+ */
+static void fix_uninit_block_bitmaps(ext2_filsys fs)
+{
+ blk64_t blk, lblk;
+ dgrp_t g;
+ unsigned int i;
+
+ if (!ext2fs_has_group_desc_csum(fs))
+ return;
+
+ for (g=0; g < fs->group_desc_count; g++) {
+ if (!(ext2fs_bg_flags_test(fs, g, EXT2_BG_BLOCK_UNINIT)))
+ continue;
+
+ blk = ext2fs_group_first_block2(fs, g);
+ lblk = ext2fs_group_last_block2(fs, g);
+ ext2fs_unmark_block_bitmap_range2(fs->block_map, blk,
+ lblk - blk + 1);
+
+ ext2fs_reserve_super_and_bgd(fs, g, fs->block_map);
+ ext2fs_mark_block_bitmap2(fs->block_map,
+ ext2fs_block_bitmap_loc(fs, g));
+ ext2fs_mark_block_bitmap2(fs->block_map,
+ ext2fs_inode_bitmap_loc(fs, g));
+ for (i = 0, blk = ext2fs_inode_table_loc(fs, g);
+ i < fs->inode_blocks_per_group;
+ i++, blk++)
+ ext2fs_mark_block_bitmap2(fs->block_map, blk);
+ }
+}
+
+/* --------------------------------------------------------------------
+ *
+ * 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.
+ * --------------------------------------------------------------------
+ */
+
+/*
+ * If the group descriptor's bitmap and inode table blocks are valid,
+ * release them in the new filesystem data structure, and mark them as
+ * reserved so the old inode table blocks don't get overwritten.
+ */
+static errcode_t free_gdp_blocks(ext2_filsys fs,
+ ext2fs_block_bitmap reserve_blocks,
+ ext2_filsys old_fs,
+ dgrp_t group)
+{
+ blk64_t blk;
+ unsigned int j;
+ dgrp_t i;
+ ext2fs_block_bitmap bg_map = NULL;
+ errcode_t retval = 0;
+ dgrp_t count = old_fs->group_desc_count - fs->group_desc_count;
+
+ /* If bigalloc, don't free metadata living in the same cluster */
+ if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
+ retval = ext2fs_allocate_block_bitmap(fs, "bgdata", &bg_map);
+ if (retval)
+ goto out;
+
+ retval = mark_table_blocks(fs, bg_map);
+ if (retval)
+ goto out;
+ }
+
+ for (i = group; i < group + count; i++) {
+ blk = ext2fs_block_bitmap_loc(old_fs, i);
+ if (blk &&
+ (blk < ext2fs_blocks_count(fs->super)) &&
+ !(bg_map && ext2fs_test_block_bitmap2(bg_map, blk))) {
+ ext2fs_block_alloc_stats2(fs, blk, -1);
+ ext2fs_mark_block_bitmap2(reserve_blocks, blk);
+ }
+
+ blk = ext2fs_inode_bitmap_loc(old_fs, i);
+ if (blk &&
+ (blk < ext2fs_blocks_count(fs->super)) &&
+ !(bg_map && ext2fs_test_block_bitmap2(bg_map, blk))) {
+ ext2fs_block_alloc_stats2(fs, blk, -1);
+ ext2fs_mark_block_bitmap2(reserve_blocks, blk);
+ }
+
+ blk = ext2fs_inode_table_loc(old_fs, i);
+ for (j = 0;
+ j < fs->inode_blocks_per_group; j++, blk++) {
+ if (blk >= ext2fs_blocks_count(fs->super) ||
+ (bg_map && ext2fs_test_block_bitmap2(bg_map, blk)))
+ continue;
+ ext2fs_block_alloc_stats2(fs, blk, -1);
+ ext2fs_mark_block_bitmap2(reserve_blocks, blk);
+ }
+ }
+
+out:
+ if (bg_map)
+ ext2fs_free_block_bitmap(bg_map);
+ return retval;
+}
+
+/*
+ * 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,
+ ext2fs_block_bitmap reserve_blocks, blk64_t new_size)
+{
+ errcode_t retval;
+ blk64_t overhead = 0;
+ blk64_t rem;
+ blk64_t blk, group_block;
+ blk64_t real_end;
+ blk64_t old_numblocks, numblocks, adjblocks;
+ unsigned long i, j, old_desc_blocks;
+ unsigned int meta_bg, meta_bg_size;
+ int has_super, csum_flag, has_bg;
+ unsigned long long new_inodes; /* u64 to check for overflow */
+ double percent;
+
+ ext2fs_blocks_count_set(fs->super, new_size);
+ fs->super->s_overhead_clusters = 0;
+
+retry:
+ fs->group_desc_count = ext2fs_div64_ceil(ext2fs_blocks_count(fs->super) -
+ 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 = 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.
+ */
+ overhead = (int) (2 + fs->inode_blocks_per_group);
+
+ has_bg = 0;
+ if (ext2fs_has_feature_sparse_super2(fs->super)) {
+ /*
+ * We have to do this manually since
+ * super->s_backup_bgs hasn't been set up yet.
+ */
+ if (fs->group_desc_count == 2)
+ has_bg = fs->super->s_backup_bgs[0] != 0;
+ else
+ has_bg = fs->super->s_backup_bgs[1] != 0;
+ } else
+ has_bg = ext2fs_bg_has_super(fs, fs->group_desc_count - 1);
+ if (has_bg)
+ 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
+ * it.
+ */
+ rem = (ext2fs_blocks_count(fs->super) - fs->super->s_first_data_block) %
+ fs->super->s_blocks_per_group;
+ if ((fs->group_desc_count == 1) && rem && (rem < overhead))
+ return EXT2_ET_TOOSMALL;
+ if ((fs->group_desc_count > 1) && rem && (rem < overhead+50)) {
+ ext2fs_blocks_count_set(fs->super,
+ ext2fs_blocks_count(fs->super) - rem);
+ goto retry;
+ }
+ /*
+ * Adjust the number of inodes
+ */
+ new_inodes =(unsigned long long) fs->super->s_inodes_per_group * fs->group_desc_count;
+ if (new_inodes > ~0U) {
+ new_inodes = (unsigned long long) fs->super->s_inodes_per_group * (fs->group_desc_count - 1);
+ if (new_inodes <= ~0U) {
+ unsigned long long new_blocks =
+ ((unsigned long long) fs->super->s_blocks_per_group *
+ (fs->group_desc_count - 1)) + fs->super->s_first_data_block;
+
+ ext2fs_blocks_count_set(fs->super, new_blocks);
+ goto retry;
+ }
+ fprintf(stderr, _("inodes (%llu) must be less than %u\n"),
+ (unsigned long long) 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 = ext2fs_blocks_count(old_fs->super);
+ if (blk > ext2fs_blocks_count(fs->super))
+ ext2fs_free_blocks_count_set(fs->super,
+ ext2fs_free_blocks_count(fs->super) -
+ (blk - ext2fs_blocks_count(fs->super)));
+ else
+ ext2fs_free_blocks_count_set(fs->super,
+ ext2fs_free_blocks_count(fs->super) +
+ (ext2fs_blocks_count(fs->super) - blk));
+
+ /*
+ * Adjust the number of reserved blocks
+ */
+ percent = (ext2fs_r_blocks_count(old_fs->super) * 100.0) /
+ ext2fs_blocks_count(old_fs->super);
+ ext2fs_r_blocks_count_set(fs->super,
+ (percent * ext2fs_blocks_count(fs->super) /
+ 100.0));
+
+ /*
+ * Adjust the bitmaps for size
+ */
+ retval = ext2fs_resize_inode_bitmap2(fs->super->s_inodes_count,
+ fs->super->s_inodes_count,
+ fs->inode_map);
+ if (retval) goto errout;
+
+ real_end = EXT2_GROUPS_TO_BLOCKS(fs->super, fs->group_desc_count) - 1 +
+ fs->super->s_first_data_block;
+ retval = ext2fs_resize_block_bitmap2(new_size - 1,
+ real_end, fs->block_map);
+ if (retval) goto errout;
+
+ /*
+ * If we are growing the file system, also grow the size of
+ * the reserve_blocks bitmap
+ */
+ if (reserve_blocks && new_size > ext2fs_blocks_count(old_fs->super)) {
+ retval = ext2fs_resize_block_bitmap2(new_size - 1,
+ real_end, reserve_blocks);
+ if (retval) goto errout;
+ }
+
+ /*
+ * Reallocate the group descriptors as necessary.
+ */
+ if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super) &&
+ 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.
+ *
+ * Note: If we're converting to 64bit mode, we did this earlier.
+ */
+ if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super))
+ adjust_reserved_gdt_blocks(old_fs, fs);
+
+ if (ext2fs_has_feature_meta_bg(fs->super) &&
+ (fs->super->s_first_meta_bg > fs->desc_blocks)) {
+ ext2fs_clear_feature_meta_bg(fs->super);
+ fs->super->s_first_meta_bg = 0;
+ }
+
+ /*
+ * Update the location of the backup superblocks if the
+ * sparse_super2 feature is enabled.
+ */
+ if (ext2fs_has_feature_sparse_super2(fs->super)) {
+ dgrp_t last_bg = fs->group_desc_count - 1;
+ dgrp_t old_last_bg = old_fs->group_desc_count - 1;
+
+ if (last_bg > old_last_bg) {
+ if (old_fs->group_desc_count == 1)
+ fs->super->s_backup_bgs[0] = 1;
+ if ((old_fs->group_desc_count < 3 &&
+ fs->group_desc_count > 2) ||
+ fs->super->s_backup_bgs[1])
+ fs->super->s_backup_bgs[1] = last_bg;
+ } else if (last_bg < old_last_bg) {
+ if (fs->super->s_backup_bgs[0] > last_bg)
+ fs->super->s_backup_bgs[0] = 0;
+ if (fs->super->s_backup_bgs[1] > last_bg)
+ fs->super->s_backup_bgs[1] = 0;
+ if (last_bg > 1 &&
+ old_fs->super->s_backup_bgs[1] == old_last_bg)
+ fs->super->s_backup_bgs[1] = last_bg;
+ }
+ }
+
+ /*
+ * If we are shrinking the number of block groups, we're done
+ * and can exit now.
+ */
+ if (old_fs->group_desc_count > fs->group_desc_count) {
+ /*
+ * Check the block groups that we are chopping off
+ * and free any blocks associated with their metadata
+ */
+ retval = free_gdp_blocks(fs, reserve_blocks, old_fs,
+ fs->group_desc_count);
+ goto errout;
+ }
+
+ /*
+ * Fix the count of the last (old) block group
+ */
+ old_numblocks = (ext2fs_blocks_count(old_fs->super) -
+ old_fs->super->s_first_data_block) %
+ old_fs->super->s_blocks_per_group;
+ if (!old_numblocks)
+ old_numblocks = old_fs->super->s_blocks_per_group;
+ if (old_fs->group_desc_count == fs->group_desc_count) {
+ numblocks = (ext2fs_blocks_count(fs->super) -
+ fs->super->s_first_data_block) %
+ fs->super->s_blocks_per_group;
+ if (!numblocks)
+ numblocks = fs->super->s_blocks_per_group;
+ } else
+ numblocks = fs->super->s_blocks_per_group;
+ i = old_fs->group_desc_count - 1;
+ ext2fs_bg_free_blocks_count_set(fs, i, ext2fs_bg_free_blocks_count(fs, i) + (numblocks - old_numblocks));
+ ext2fs_group_desc_csum_set(fs, i);
+
+ /*
+ * 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
+ */
+ group_block = ext2fs_group_first_block2(fs,
+ old_fs->group_desc_count);
+ csum_flag = ext2fs_has_group_desc_csum(fs);
+ if (getenv("RESIZE2FS_FORCE_LAZY_ITABLE_INIT") ||
+ (!getenv("RESIZE2FS_FORCE_ITABLE_INIT") &&
+ access("/sys/fs/ext4/features/lazy_itable_init", F_OK) == 0))
+ lazy_itable_init = 1;
+ if (ext2fs_has_feature_meta_bg(fs->super))
+ old_desc_blocks = fs->super->s_first_meta_bg;
+ else
+ old_desc_blocks = fs->desc_blocks +
+ fs->super->s_reserved_gdt_blocks;
+
+ /*
+ * If we changed the number of block_group descriptor blocks,
+ * we need to make sure they are all marked as reserved in the
+ * filesystem's block allocation map.
+ */
+ for (i = 0; i < old_fs->group_desc_count; i++)
+ ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
+
+ for (i = old_fs->group_desc_count;
+ i < fs->group_desc_count; i++) {
+ memset(ext2fs_group_desc(fs, fs->group_desc, i), 0,
+ sizeof(struct ext2_group_desc));
+ adjblocks = 0;
+
+ ext2fs_bg_flags_zap(fs, i);
+ if (csum_flag) {
+ ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
+ if (!lazy_itable_init)
+ ext2fs_bg_flags_set(fs, i,
+ EXT2_BG_INODE_ZEROED);
+ ext2fs_bg_itable_unused_set(fs, i,
+ fs->super->s_inodes_per_group);
+ }
+
+ numblocks = ext2fs_group_blocks_count(fs, i);
+ if ((i < fs->group_desc_count - 1) && csum_flag)
+ ext2fs_bg_flags_set(fs, i, EXT2_BG_BLOCK_UNINIT);
+
+ has_super = ext2fs_bg_has_super(fs, i);
+ if (has_super) {
+ ext2fs_block_alloc_stats2(fs, group_block, +1);
+ adjblocks++;
+ }
+ meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
+ meta_bg = i / meta_bg_size;
+ if (!ext2fs_has_feature_meta_bg(fs->super) ||
+ (meta_bg < fs->super->s_first_meta_bg)) {
+ if (has_super) {
+ for (j=0; j < old_desc_blocks; j++)
+ ext2fs_block_alloc_stats2(fs,
+ group_block + 1 + j, +1);
+ 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_block_alloc_stats2(fs,
+ group_block + has_super, +1);
+ }
+
+ adjblocks += 2 + fs->inode_blocks_per_group;
+
+ numblocks -= adjblocks;
+ ext2fs_free_blocks_count_set(fs->super,
+ ext2fs_free_blocks_count(fs->super) - adjblocks);
+ fs->super->s_free_inodes_count +=
+ fs->super->s_inodes_per_group;
+ ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
+ ext2fs_bg_free_inodes_count_set(fs, i,
+ fs->super->s_inodes_per_group);
+ ext2fs_bg_used_dirs_count_set(fs, i, 0);
+ ext2fs_group_desc_csum_set(fs, i);
+
+ retval = ext2fs_allocate_group_table(fs, i, 0);
+ if (retval) goto errout;
+
+ group_block += fs->super->s_blocks_per_group;
+ }
+ retval = 0;
+
+ /*
+ * Mark all of the metadata blocks as reserved so they won't
+ * get allocated by the call to ext2fs_allocate_group_table()
+ * in blocks_to_move(), where we allocate new blocks to
+ * replace those allocation bitmap and inode table blocks
+ * which have to get relocated to make space for an increased
+ * number of the block group descriptors.
+ */
+ if (reserve_blocks)
+ mark_table_blocks(fs, reserve_blocks);
+
+errout:
+ return (retval);
+}
+
+/*
+ * Replicate the first part of adjust_fs_info to determine what the
+ * new size of the file system should be. This allows resize2fs to
+ * exit early if we aren't going to make any changes to the file
+ * system.
+ */
+void adjust_new_size(ext2_filsys fs, blk64_t *sizep)
+{
+ blk64_t size, rem, overhead = 0;
+ unsigned long desc_blocks;
+ dgrp_t group_desc_count;
+ int has_bg;
+ unsigned long long new_inodes; /* u64 to check for overflow */
+
+ size = *sizep;
+retry:
+ group_desc_count = ext2fs_div64_ceil(size -
+ fs->super->s_first_data_block,
+ EXT2_BLOCKS_PER_GROUP(fs->super));
+ if (group_desc_count == 0)
+ return;
+ desc_blocks = ext2fs_div_ceil(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.
+ */
+ overhead = (int) (2 + fs->inode_blocks_per_group);
+
+ has_bg = 0;
+ if (ext2fs_has_feature_sparse_super2(fs->super)) {
+ /*
+ * We have to do this manually since
+ * super->s_backup_bgs hasn't been set up yet.
+ */
+ if (group_desc_count == 2)
+ has_bg = fs->super->s_backup_bgs[0] != 0;
+ else
+ has_bg = fs->super->s_backup_bgs[1] != 0;
+ } else
+ has_bg = ext2fs_bg_has_super(fs, group_desc_count - 1);
+ if (has_bg)
+ overhead += 1 + 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
+ * it.
+ */
+ rem = (size - fs->super->s_first_data_block) %
+ fs->super->s_blocks_per_group;
+ if ((group_desc_count == 1) && rem && (rem < overhead))
+ return;
+ if ((group_desc_count > 1) && rem && (rem < overhead+50)) {
+ size -= rem;
+ goto retry;
+ }
+
+ /*
+ * If we need to reduce the size by no more than a block
+ * group to avoid overrunning the max inode limit, do it.
+ */
+ new_inodes =(unsigned long long) fs->super->s_inodes_per_group * group_desc_count;
+ if (new_inodes > ~0U) {
+ new_inodes = (unsigned long long) fs->super->s_inodes_per_group * (group_desc_count - 1);
+ if (new_inodes > ~0U)
+ return;
+ size = ((unsigned long long) fs->super->s_blocks_per_group *
+ (group_desc_count - 1)) + fs->super->s_first_data_block;
+
+ goto retry;
+ }
+ *sizep = size;
+}
+
+/*
+ * 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, blk64_t new_size)
+{
+ ext2_filsys fs = rfs->new_fs;
+ int adj = 0;
+ errcode_t retval;
+ unsigned long i;
+ unsigned long max_group;
+
+ ext2fs_mark_super_dirty(fs);
+ ext2fs_mark_bb_dirty(fs);
+ ext2fs_mark_ib_dirty(fs);
+
+ retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
+ &rfs->reserve_blocks);
+ if (retval)
+ return retval;
+
+ retval = adjust_fs_info(fs, rfs->old_fs, rfs->reserve_blocks, 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;
+ }
+
+ /*
+ * If we are using uninit_bg (aka GDT_CSUM) and the kernel
+ * supports lazy inode initialization, we can skip
+ * initializing the inode table.
+ */
+ if (lazy_itable_init && ext2fs_has_group_desc_csum(fs)) {
+ retval = 0;
+ goto errout;
+ }
+
+ /*
+ * Initialize the inode table
+ */
+ 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);
+ 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)
+ goto errout;
+ }
+ for (i = rfs->old_fs->group_desc_count;
+ i < fs->group_desc_count; i++) {
+ /*
+ * Write out the new inode table
+ */
+ retval = ext2fs_zero_blocks2(fs, ext2fs_inode_table_loc(fs, i),
+ fs->inode_blocks_per_group, NULL,
+ NULL);
+ if (retval)
+ goto errout;
+
+ io_channel_flush(fs->io);
+ if (rfs->progress) {
+ retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
+ i - adj + 1, max_group);
+ if (retval)
+ goto errout;
+ }
+ }
+ 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)
+{
+ dgrp_t i;
+ blk64_t blk;
+
+ 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
+ */
+ blk = ext2fs_inode_table_loc(fs, i);
+ if (blk)
+ ext2fs_mark_block_bitmap_range2(bmap, blk,
+ fs->inode_blocks_per_group);
+
+ /*
+ * Mark block used for the block bitmap
+ */
+ blk = ext2fs_block_bitmap_loc(fs, i);
+ if (blk)
+ ext2fs_mark_block_bitmap2(bmap, blk);
+
+ /*
+ * Mark block used for the inode bitmap
+ */
+ blk = ext2fs_inode_bitmap_loc(fs, i);
+ if (blk)
+ ext2fs_mark_block_bitmap2(bmap, blk);
+ }
+ /* Reserve the MMP block */
+ if (ext2fs_has_feature_mmp(fs->super) &&
+ fs->super->s_mmp_block > fs->super->s_first_data_block &&
+ fs->super->s_mmp_block < ext2fs_blocks_count(fs->super))
+ ext2fs_mark_block_bitmap2(bmap, fs->super->s_mmp_block);
+ 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, blk64_t blk)
+{
+ ext2_filsys fs = rfs->new_fs;
+
+ ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
+ ext2fs_block_alloc_stats2(fs, blk, +1);
+
+ /*
+ * 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)) {
+ ext2fs_block_bitmap_loc_set(fs, group, 0);
+ rfs->needed_blocks++;
+ return;
+ }
+ if (is_inode_bm(fs, group, blk)) {
+ ext2fs_inode_bitmap_loc_set(fs, group, 0);
+ rfs->needed_blocks++;
+ return;
+ }
+ if (is_inode_tb(fs, group, blk)) {
+ ext2fs_inode_table_loc_set(fs, group, 0);
+ rfs->needed_blocks++;
+ return;
+ }
+ if (ext2fs_has_feature_flex_bg(fs->super)) {
+ dgrp_t i;
+
+ for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
+ if (is_block_bm(fs, i, blk)) {
+ ext2fs_block_bitmap_loc_set(fs, i, 0);
+ rfs->needed_blocks++;
+ return;
+ }
+ if (is_inode_bm(fs, i, blk)) {
+ ext2fs_inode_bitmap_loc_set(fs, i, 0);
+ rfs->needed_blocks++;
+ return;
+ }
+ if (is_inode_tb(fs, i, blk)) {
+ ext2fs_inode_table_loc_set(fs, i, 0);
+ rfs->needed_blocks++;
+ return;
+ }
+ }
+ }
+
+ if (ext2fs_has_group_desc_csum(fs) &&
+ (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT))) {
+ /*
+ * If the block bitmap is uninitialized, which means
+ * nothing other than standard metadata in use.
+ */
+ return;
+ } else if (blk < ext2fs_blocks_count(rfs->old_fs->super) &&
+ ext2fs_test_block_bitmap2(rfs->old_fs->block_map, blk) &&
+ !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
+ ext2fs_mark_block_bitmap2(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 blocks_to_move(ext2_resize_t rfs)
+{
+ unsigned int j;
+ int has_super;
+ dgrp_t i, max_groups, g;
+ blk64_t blk, group_blk;
+ blk64_t old_blocks, new_blocks, group_end, cluster_freed;
+ blk64_t new_size;
+ unsigned int meta_bg, meta_bg_size;
+ errcode_t retval;
+ ext2_filsys fs, old_fs;
+ ext2fs_block_bitmap meta_bmap, new_meta_bmap = NULL;
+ int flex_bg;
+
+ fs = rfs->new_fs;
+ old_fs = rfs->old_fs;
+ if (ext2fs_blocks_count(old_fs->super) > ext2fs_blocks_count(fs->super))
+ fs = rfs->old_fs;
+
+ 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 any
+ * group's metadata blocks (either allocation bitmaps or the
+ * inode table) which are beyond the end of the new
+ * filesystem.
+ */
+ new_size = ext2fs_blocks_count(fs->super);
+ if (new_size < ext2fs_blocks_count(old_fs->super)) {
+ for (g = 0; g < fs->group_desc_count; g++) {
+ int realloc = 0;
+ /*
+ * ext2fs_allocate_group_table will re-allocate any
+ * metadata blocks whose location is set to zero.
+ */
+ if (ext2fs_block_bitmap_loc(fs, g) >= new_size) {
+ ext2fs_block_bitmap_loc_set(fs, g, 0);
+ realloc = 1;
+ }
+ if (ext2fs_inode_bitmap_loc(fs, g) >= new_size) {
+ ext2fs_inode_bitmap_loc_set(fs, g, 0);
+ realloc = 1;
+ }
+ if ((ext2fs_inode_table_loc(fs, g) +
+ fs->inode_blocks_per_group) > new_size) {
+ ext2fs_inode_table_loc_set(fs, g, 0);
+ realloc = 1;
+ }
+
+ if (realloc) {
+ retval = ext2fs_allocate_group_table(fs, g, 0);
+ if (retval)
+ return retval;
+ }
+ }
+ }
+
+ /*
+ * If we're shrinking the filesystem, we need to move all of
+ * the blocks that don't fit any more
+ */
+ for (blk = ext2fs_blocks_count(fs->super);
+ blk < ext2fs_blocks_count(old_fs->super); blk++) {
+ g = ext2fs_group_of_blk2(fs, blk);
+ if (ext2fs_has_group_desc_csum(fs) &&
+ ext2fs_bg_flags_test(old_fs, g, EXT2_BG_BLOCK_UNINIT)) {
+ /*
+ * The block bitmap is uninitialized, so skip
+ * to the next block group.
+ */
+ blk = ext2fs_group_first_block2(fs, g+1) - 1;
+ continue;
+ }
+ if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
+ !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
+ ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
+ rfs->needed_blocks++;
+ }
+ ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
+ }
+
+ if (ext2fs_has_feature_meta_bg(old_fs->super))
+ old_blocks = old_fs->super->s_first_meta_bg;
+ else
+ old_blocks = old_fs->desc_blocks +
+ old_fs->super->s_reserved_gdt_blocks;
+ if (ext2fs_has_feature_meta_bg(fs->super))
+ new_blocks = fs->super->s_first_meta_bg;
+ else
+ new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
+
+ retval = reserve_sparse_super2_last_group(rfs, meta_bmap);
+ if (retval)
+ goto errout;
+
+ if (EXT2_DESC_SIZE(rfs->old_fs->super) ==
+ EXT2_DESC_SIZE(rfs->new_fs->super) &&
+ old_blocks == new_blocks) {
+ retval = 0;
+ goto errout;
+ }
+
+ 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) {
+ if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
+ retval = ext2fs_allocate_block_bitmap(fs,
+ _("new meta blocks"),
+ &new_meta_bmap);
+ if (retval)
+ goto errout;
+
+ retval = mark_table_blocks(fs, new_meta_bmap);
+ if (retval)
+ goto errout;
+ }
+
+ for (i = 0; i < max_groups; i++) {
+ if (!ext2fs_bg_has_super(old_fs, i)) {
+ group_blk += fs->super->s_blocks_per_group;
+ continue;
+ }
+ group_end = group_blk + 1 + old_blocks;
+ for (blk = group_blk + 1 + new_blocks;
+ blk < group_end;) {
+ if (new_meta_bmap == NULL ||
+ !ext2fs_test_block_bitmap2(new_meta_bmap,
+ blk)) {
+ cluster_freed =
+ EXT2FS_CLUSTER_RATIO(fs) -
+ (blk &
+ EXT2FS_CLUSTER_MASK(fs));
+ if (cluster_freed > group_end - blk)
+ cluster_freed = group_end - blk;
+ ext2fs_block_alloc_stats2(fs, blk, -1);
+ blk += EXT2FS_CLUSTER_RATIO(fs);
+ rfs->needed_blocks -= cluster_freed;
+ continue;
+ }
+ rfs->needed_blocks--;
+ blk++;
+ }
+ group_blk += fs->super->s_blocks_per_group;
+ }
+ retval = 0;
+ goto errout;
+ }
+ /*
+ * If we're increasing the number of descriptor blocks, life
+ * gets interesting....
+ */
+ meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
+ flex_bg = ext2fs_has_feature_flex_bg(fs->super);
+ /* first reserve all of the existing fs meta blocks */
+ 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);
+
+ meta_bg = i / meta_bg_size;
+ if (!ext2fs_has_feature_meta_bg(fs->super) ||
+ (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);
+ }
+
+ /*
+ * Reserve the existing meta blocks that we know
+ * aren't to be moved.
+ *
+ * For flex_bg file systems, in order to avoid
+ * overwriting fs metadata (especially inode table
+ * blocks) belonging to a different block group when
+ * we are relocating the inode tables, we need to
+ * reserve all existing fs metadata blocks.
+ */
+ if (ext2fs_block_bitmap_loc(fs, i))
+ ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
+ ext2fs_block_bitmap_loc(fs, i));
+ else if (flex_bg && i < old_fs->group_desc_count)
+ ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
+ ext2fs_block_bitmap_loc(old_fs, i));
+
+ if (ext2fs_inode_bitmap_loc(fs, i))
+ ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
+ ext2fs_inode_bitmap_loc(fs, i));
+ else if (flex_bg && i < old_fs->group_desc_count)
+ ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
+ ext2fs_inode_bitmap_loc(old_fs, i));
+
+ if (ext2fs_inode_table_loc(fs, i))
+ ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
+ ext2fs_inode_table_loc(fs, i),
+ fs->inode_blocks_per_group);
+ else if (flex_bg && i < old_fs->group_desc_count)
+ ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
+ ext2fs_inode_table_loc(old_fs, i),
+ old_fs->inode_blocks_per_group);
+
+ group_blk += rfs->new_fs->super->s_blocks_per_group;
+ }
+
+ /* Allocate the missing data structures */
+ for (i = 0; i < max_groups; i++) {
+ if (ext2fs_inode_table_loc(fs, i) &&
+ ext2fs_inode_bitmap_loc(fs, i) &&
+ ext2fs_block_bitmap_loc(fs, i))
+ continue;
+
+ retval = ext2fs_allocate_group_table(fs, i,
+ rfs->reserve_blocks);
+ if (retval)
+ goto errout;
+
+ /*
+ * For those structures that have changed, we need to
+ * do bookkeeping.
+ */
+ if (ext2fs_block_bitmap_loc(old_fs, i) !=
+ (blk = ext2fs_block_bitmap_loc(fs, i))) {
+ ext2fs_block_alloc_stats2(fs, blk, +1);
+ if (blk < ext2fs_blocks_count(old_fs->super) &&
+ ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
+ !ext2fs_test_block_bitmap2(meta_bmap, blk))
+ ext2fs_mark_block_bitmap2(rfs->move_blocks,
+ blk);
+ }
+ if (ext2fs_inode_bitmap_loc(old_fs, i) !=
+ (blk = ext2fs_inode_bitmap_loc(fs, i))) {
+ ext2fs_block_alloc_stats2(fs, blk, +1);
+ if (blk < ext2fs_blocks_count(old_fs->super) &&
+ ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
+ !ext2fs_test_block_bitmap2(meta_bmap, blk))
+ ext2fs_mark_block_bitmap2(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 (ext2fs_inode_table_loc(fs, i) == ext2fs_inode_table_loc(old_fs, i))
+ continue; /* 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 = ext2fs_inode_table_loc(fs, i), j=0;
+ j < fs->inode_blocks_per_group ; j++, blk++) {
+ ext2fs_block_alloc_stats2(fs, blk, +1);
+ if (blk < ext2fs_blocks_count(old_fs->super) &&
+ ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
+ !ext2fs_test_block_bitmap2(meta_bmap, blk))
+ ext2fs_mark_block_bitmap2(rfs->move_blocks,
+ blk);
+ }
+
+ /*
+ * Make sure the old inode table is reserved in the
+ * block reservation bitmap.
+ */
+ for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
+ j < fs->inode_blocks_per_group ; j++, blk++)
+ ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
+ }
+ retval = 0;
+
+errout:
+ if (new_meta_bmap)
+ ext2fs_free_block_bitmap(new_meta_bmap);
+ if (meta_bmap)
+ ext2fs_free_block_bitmap(meta_bmap);
+
+ return retval;
+}
+
+/*
+ * 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.
+ */
+
+#define AVOID_OLD 1
+#define DESPERATION 2
+
+static void init_block_alloc(ext2_resize_t rfs)
+{
+ rfs->alloc_state = AVOID_OLD;
+ rfs->new_blk = rfs->new_fs->super->s_first_data_block;
+#if 0
+ /* HACK for testing */
+ if (ext2fs_blocks_count(rfs->new_fs->super) >
+ ext2fs_blocks_count(rfs->old_fs->super))
+ rfs->new_blk = ext2fs_blocks_count(rfs->old_fs->super);
+#endif
+}
+
+static blk64_t get_new_block(ext2_resize_t rfs)
+{
+ ext2_filsys fs = rfs->new_fs;
+
+ while (1) {
+ if (rfs->new_blk >= ext2fs_blocks_count(fs->super)) {
+ 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_bitmap2(fs->block_map, rfs->new_blk) ||
+ ext2fs_test_block_bitmap2(rfs->reserve_blocks,
+ rfs->new_blk) ||
+ ((rfs->alloc_state == AVOID_OLD) &&
+ (rfs->new_blk < ext2fs_blocks_count(rfs->old_fs->super)) &&
+ ext2fs_test_block_bitmap2(rfs->old_fs->block_map,
+ rfs->new_blk))) {
+ rfs->new_blk++;
+ continue;
+ }
+ return rfs->new_blk;
+ }
+}
+
+static errcode_t resize2fs_get_alloc_block(ext2_filsys fs,
+ blk64_t goal EXT2FS_ATTR((unused)),
+ blk64_t *ret)
+{
+ ext2_resize_t rfs = (ext2_resize_t) fs->priv_data;
+ blk64_t blk;
+ int group;
+
+ blk = get_new_block(rfs);
+ if (!blk)
+ return ENOSPC;
+
+#ifdef RESIZE2FS_DEBUG
+ if (rfs->flags & 0xF)
+ printf("get_alloc_block allocating %llu\n",
+ (unsigned long long) blk);
+#endif
+
+ ext2fs_mark_block_bitmap2(rfs->old_fs->block_map, blk);
+ ext2fs_mark_block_bitmap2(rfs->new_fs->block_map, blk);
+
+ group = ext2fs_group_of_blk2(rfs->old_fs, blk);
+ ext2fs_clear_block_uninit(rfs->old_fs, group);
+ group = ext2fs_group_of_blk2(rfs->new_fs, blk);
+ ext2fs_clear_block_uninit(rfs->new_fs, group);
+
+ *ret = (blk64_t) blk;
+ return 0;
+}
+
+static errcode_t block_mover(ext2_resize_t rfs)
+{
+ blk64_t blk, old_blk, new_blk;
+ ext2_filsys fs = rfs->new_fs;
+ ext2_filsys old_fs = rfs->old_fs;
+ errcode_t retval;
+ __u64 c, size;
+ int to_move, moved;
+ ext2_badblocks_list badblock_list = 0;
+ int bb_modified = 0;
+
+ fs->get_alloc_block = resize2fs_get_alloc_block;
+ old_fs->get_alloc_block = resize2fs_get_alloc_block;
+
+ 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)
+ goto errout;
+ }
+ retval = ext2fs_create_extent_table(&rfs->bmap, 0);
+ if (retval)
+ goto errout;
+
+ /*
+ * The first step is to figure out where all of the blocks
+ * will go.
+ */
+ to_move = moved = 0;
+ init_block_alloc(rfs);
+ for (blk = B2C(old_fs->super->s_first_data_block);
+ blk < ext2fs_blocks_count(old_fs->super);
+ blk += EXT2FS_CLUSTER_RATIO(fs)) {
+ if (!ext2fs_test_block_bitmap2(old_fs->block_map, blk))
+ continue;
+ if (!ext2fs_test_block_bitmap2(rfs->move_blocks, blk))
+ continue;
+ if (ext2fs_badblocks_list_test(badblock_list, blk)) {
+ ext2fs_badblocks_list_del(badblock_list, blk);
+ bb_modified++;
+ continue;
+ }
+
+ new_blk = get_new_block(rfs);
+ if (!new_blk) {
+ retval = ENOSPC;
+ goto errout;
+ }
+ ext2fs_block_alloc_stats2(fs, new_blk, +1);
+ ext2fs_add_extent_entry(rfs->bmap, B2C(blk), B2C(new_blk));
+ to_move++;
+ }
+
+ if (to_move == 0) {
+ if (rfs->bmap) {
+ ext2fs_free_extent_table(rfs->bmap);
+ rfs->bmap = 0;
+ }
+ retval = 0;
+ 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;
+ old_blk = C2B(old_blk);
+ new_blk = C2B(new_blk);
+ size = C2B(size);
+#ifdef RESIZE2FS_DEBUG
+ if (rfs->flags & RESIZE_DEBUG_BMOVE)
+ printf("Moving %llu blocks %llu->%llu\n",
+ (unsigned long long) size,
+ (unsigned long long) old_blk,
+ (unsigned long long) new_blk);
+#endif
+ do {
+ c = size;
+ if (c > fs->inode_blocks_per_group)
+ c = fs->inode_blocks_per_group;
+ retval = io_channel_read_blk64(fs->io, old_blk, c,
+ rfs->itable_buf);
+ if (retval) goto errout;
+ retval = io_channel_write_blk64(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
+ *
+ * --------------------------------------------------------------------
+ */
+
+
+/*
+ * The extent translation table is stored in clusters so we need to
+ * take special care when mapping a source block number to its
+ * destination block number.
+ */
+static __u64 extent_translate(ext2_filsys fs, ext2_extent extent, __u64 old_loc)
+{
+ __u64 new_block = C2B(ext2fs_extent_translate(extent, B2C(old_loc)));
+
+ if (new_block != 0)
+ new_block += old_loc & (EXT2FS_CLUSTER_RATIO(fs) - 1);
+ return new_block;
+}
+
+struct process_block_struct {
+ ext2_resize_t rfs;
+ ext2_ino_t ino;
+ ext2_ino_t old_ino;
+ struct ext2_inode * inode;
+ errcode_t error;
+ int is_dir;
+ int changed;
+ int has_extents;
+};
+
+static int process_block(ext2_filsys fs, blk64_t *block_nr,
+ e2_blkcnt_t blockcnt,
+ blk64_t ref_block EXT2FS_ATTR((unused)),
+ int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
+{
+ struct process_block_struct *pb;
+ errcode_t retval;
+ blk64_t block, new_block;
+ int ret = 0;
+
+ pb = (struct process_block_struct *) priv_data;
+ block = *block_nr;
+ if (pb->rfs->bmap) {
+ new_block = extent_translate(fs, 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, %llu->%llu\n",
+ pb->old_ino, (long long) blockcnt,
+ (unsigned long long) block,
+ (unsigned long long) new_block);
+#endif
+ block = new_block;
+ }
+ }
+
+ if (pb->is_dir) {
+ retval = ext2fs_add_dir_block2(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 migrate_ea_block(ext2_resize_t rfs, ext2_ino_t ino,
+ struct ext2_inode *inode, int *changed)
+{
+ char *buf = NULL;
+ blk64_t new_block;
+ errcode_t err = 0;
+
+ /* No EA block or no remapping? Quit early. */
+ if (ext2fs_file_acl_block(rfs->old_fs, inode) == 0 || !rfs->bmap)
+ return 0;
+ new_block = extent_translate(rfs->old_fs, rfs->bmap,
+ ext2fs_file_acl_block(rfs->old_fs, inode));
+ if (new_block == 0)
+ return 0;
+
+ /* Set the new ACL block */
+ ext2fs_file_acl_block_set(rfs->old_fs, inode, new_block);
+
+ /* Update checksum */
+ if (ext2fs_has_feature_metadata_csum(rfs->new_fs->super)) {
+ err = ext2fs_get_mem(rfs->old_fs->blocksize, &buf);
+ if (err)
+ return err;
+ rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
+ err = ext2fs_read_ext_attr3(rfs->old_fs, new_block, buf, ino);
+ rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
+ if (err)
+ goto out;
+ err = ext2fs_write_ext_attr3(rfs->old_fs, new_block, buf, ino);
+ if (err)
+ goto out;
+ }
+ *changed = 1;
+
+out:
+ ext2fs_free_mem(&buf);
+ return err;
+}
+
+static void quiet_com_err_proc(const char *whoami EXT2FS_ATTR((unused)),
+ errcode_t code EXT2FS_ATTR((unused)),
+ const char *fmt EXT2FS_ATTR((unused)),
+ va_list args EXT2FS_ATTR((unused)))
+{
+}
+
+static int fix_ea_entries(ext2_extent imap, struct ext2_ext_attr_entry *entry,
+ struct ext2_ext_attr_entry *end, ext2_ino_t last_ino)
+{
+ int modified = 0;
+ ext2_ino_t new_ino;
+
+ while (entry < end && !EXT2_EXT_IS_LAST_ENTRY(entry)) {
+ if (entry->e_value_inum > last_ino) {
+ new_ino = ext2fs_extent_translate(imap,
+ entry->e_value_inum);
+ entry->e_value_inum = new_ino;
+ modified = 1;
+ }
+ entry = EXT2_EXT_ATTR_NEXT(entry);
+ }
+ return modified;
+}
+
+static int fix_ea_ibody_entries(ext2_extent imap,
+ struct ext2_inode_large *inode, int inode_size,
+ ext2_ino_t last_ino)
+{
+ struct ext2_ext_attr_entry *start, *end;
+ __u32 *ea_magic;
+
+ if (inode->i_extra_isize == 0)
+ return 0;
+
+ ea_magic = (__u32 *)((char *)inode + EXT2_GOOD_OLD_INODE_SIZE +
+ inode->i_extra_isize);
+ if (*ea_magic != EXT2_EXT_ATTR_MAGIC)
+ return 0;
+
+ start = (struct ext2_ext_attr_entry *)(ea_magic + 1);
+ end = (struct ext2_ext_attr_entry *)((char *)inode + inode_size);
+
+ return fix_ea_entries(imap, start, end, last_ino);
+}
+
+static int fix_ea_block_entries(ext2_extent imap, char *block_buf,
+ unsigned int blocksize, ext2_ino_t last_ino)
+{
+ struct ext2_ext_attr_header *header;
+ struct ext2_ext_attr_entry *start, *end;
+
+ header = (struct ext2_ext_attr_header *)block_buf;
+ start = (struct ext2_ext_attr_entry *)(header+1);
+ end = (struct ext2_ext_attr_entry *)(block_buf + blocksize);
+
+ return fix_ea_entries(imap, start, end, last_ino);
+}
+
+/* A simple LRU cache to check recently processed blocks. */
+struct blk_cache {
+ int cursor;
+ blk64_t blks[4];
+};
+
+#define BLK_IN_CACHE(b,c) ((b) == (c).blks[0] || (b) == (c).blks[1] || \
+ (b) == (c).blks[2] || (b) == (c).blks[3])
+#define BLK_ADD_CACHE(b,c) { \
+ (c).blks[(c).cursor] = (b); \
+ (c).cursor = ((c).cursor + 1) % 4; \
+}
+
+static errcode_t fix_ea_inode_refs(ext2_resize_t rfs, struct ext2_inode *inode,
+ char *block_buf, ext2_ino_t last_ino)
+{
+ ext2_filsys fs = rfs->new_fs;
+ ext2_inode_scan scan = NULL;
+ ext2_ino_t ino;
+ int inode_size = EXT2_INODE_SIZE(fs->super);
+ blk64_t blk;
+ int modified;
+ struct blk_cache blk_cache;
+ struct ext2_ext_attr_header *header;
+ errcode_t retval;
+
+ memset(&blk_cache, 0, sizeof(blk_cache));
+
+ header = (struct ext2_ext_attr_header *)block_buf;
+
+ retval = ext2fs_open_inode_scan(fs, 0, &scan);
+ if (retval)
+ goto out;
+
+ while (1) {
+ retval = ext2fs_get_next_inode_full(scan, &ino, inode,
+ inode_size);
+ if (retval)
+ goto out;
+ if (!ino)
+ break;
+
+ if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
+ continue; /* inode not in use */
+
+ if (inode_size != EXT2_GOOD_OLD_INODE_SIZE) {
+ modified = fix_ea_ibody_entries(rfs->imap,
+ (struct ext2_inode_large *)inode,
+ inode_size, last_ino);
+ if (modified) {
+ retval = ext2fs_write_inode_full(fs, ino, inode,
+ inode_size);
+ if (retval)
+ goto out;
+ }
+ }
+
+ blk = ext2fs_file_acl_block(fs, inode);
+ if (blk && !BLK_IN_CACHE(blk, blk_cache)) {
+ retval = ext2fs_read_ext_attr3(fs, blk, block_buf, ino);
+ if (retval)
+ goto out;
+
+ modified = fix_ea_block_entries(rfs->imap, block_buf,
+ fs->blocksize,
+ last_ino);
+ if (modified) {
+ retval = ext2fs_write_ext_attr3(fs, blk,
+ block_buf, ino);
+ if (retval)
+ goto out;
+ /*
+ * If refcount is greater than 1, we might see
+ * the same block referenced by other inodes
+ * later.
+ */
+ if (header->h_refcount > 1)
+ BLK_ADD_CACHE(blk, blk_cache);
+ }
+ }
+ }
+ retval = 0;
+out:
+ if (scan)
+ ext2fs_close_inode_scan(scan);
+ return retval;
+
+}
+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 = NULL;
+ ext2_inode_scan scan = NULL;
+ errcode_t retval;
+ char *block_buf = 0;
+ ext2_ino_t start_to_move;
+ int inode_size;
+ int update_ea_inode_refs = 0;
+
+ if ((rfs->old_fs->group_desc_count <=
+ rfs->new_fs->group_desc_count) &&
+ !rfs->bmap)
+ return 0;
+
+ set_com_err_hook(quiet_com_err_proc);
+
+ 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);
+ inode_size = EXT2_INODE_SIZE(rfs->new_fs->super);
+ inode = malloc(inode_size);
+ if (!inode) {
+ retval = ENOMEM;
+ goto errout;
+ }
+ /*
+ * First, copy all of the inodes that need to be moved
+ * elsewhere in the inode table
+ */
+ while (1) {
+ retval = ext2fs_get_next_inode_full(scan, &ino, inode, inode_size);
+ 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;
+
+ /* Remap EA block */
+ retval = migrate_ea_block(rfs, ino, inode, &pb.changed);
+ if (retval)
+ goto errout;
+
+ new_inode = ino;
+ if (ino <= start_to_move)
+ goto remap_blocks; /* Don't need to move inode. */
+
+ /*
+ * Find a new inode. Now that extents and directory blocks
+ * are tied to the inode number through the checksum, we must
+ * set up the new inode before we start rewriting blocks.
+ */
+ retval = ext2fs_new_inode(rfs->new_fs, 0, 0, 0, &new_inode);
+ if (retval)
+ goto errout;
+
+ ext2fs_inode_alloc_stats2(rfs->new_fs, new_inode, +1,
+ pb.is_dir);
+ /*
+ * i_ctime field in xattr inodes contain a portion of the ref
+ * count, do not overwrite.
+ */
+ if (inode->i_flags & EXT4_EA_INODE_FL)
+ update_ea_inode_refs = 1;
+ else
+ inode->i_ctime = rfs->old_fs->now ?
+ rfs->old_fs->now : time(0);
+
+ retval = ext2fs_write_inode_full(rfs->old_fs, new_inode,
+ inode, inode_size);
+ if (retval)
+ goto errout;
+ pb.changed = 0;
+
+#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);
+
+remap_blocks:
+ if (pb.changed)
+ retval = ext2fs_write_inode_full(rfs->old_fs,
+ new_inode,
+ inode, inode_size);
+ if (retval)
+ goto errout;
+
+ /*
+ * Update inodes to point to new blocks; schedule directory
+ * blocks for inode remapping. Need to write out dir blocks
+ * with new inode numbers if we have metadata_csum enabled.
+ */
+ rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
+ if (ext2fs_inode_has_valid_blocks2(rfs->old_fs, inode) &&
+ (rfs->bmap || pb.is_dir)) {
+ pb.ino = new_inode;
+ pb.old_ino = ino;
+ pb.has_extents = inode->i_flags & EXT4_EXTENTS_FL;
+ retval = ext2fs_block_iterate3(rfs->old_fs,
+ new_inode, 0, block_buf,
+ process_block, &pb);
+ if (retval)
+ goto errout;
+ if (pb.error) {
+ retval = pb.error;
+ goto errout;
+ }
+ } else if ((inode->i_flags & EXT4_INLINE_DATA_FL) &&
+ (rfs->bmap || pb.is_dir)) {
+ /* inline data dir; update it too */
+ retval = ext2fs_add_dir_block2(rfs->old_fs->dblist,
+ new_inode, 0, 0);
+ if (retval)
+ goto errout;
+ }
+
+ /* Fix up extent block checksums with the new inode number */
+ if (ext2fs_has_feature_metadata_csum(rfs->old_fs->super) &&
+ (inode->i_flags & EXT4_EXTENTS_FL)) {
+ retval = ext2fs_fix_extents_checksums(rfs->old_fs,
+ new_inode, NULL);
+ if (retval)
+ goto errout;
+ }
+ }
+
+ if (update_ea_inode_refs &&
+ ext2fs_has_feature_ea_inode(rfs->new_fs->super)) {
+ retval = fix_ea_inode_refs(rfs, inode, block_buf,
+ start_to_move);
+ if (retval)
+ goto errout;
+ }
+ io_channel_flush(rfs->old_fs->io);
+
+errout:
+ reset_com_err_hook();
+ rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
+ 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);
+ free(inode);
+ return retval;
+}
+
+/* --------------------------------------------------------------------
+ *
+ * Resize processing, phase 4.
+ *
+ * --------------------------------------------------------------------
+ */
+
+struct istruct {
+ ext2_resize_t rfs;
+ errcode_t err;
+ unsigned int max_dirs;
+ unsigned 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;
+ int ret = 0;
+
+ 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 we have checksums enabled and the inode wasn't present in the
+ * old fs, then we must rewrite all dir blocks with new checksums.
+ */
+ if (ext2fs_has_feature_metadata_csum(is->rfs->old_fs->super) &&
+ !ext2fs_test_inode_bitmap2(is->rfs->old_fs->inode_map, dir))
+ ret |= DIRENT_CHANGED;
+
+ if (!dirent->inode)
+ return ret;
+
+ new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
+
+ if (!new_inode)
+ return ret;
+#ifdef RESIZE2FS_DEBUG
+ if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
+ printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
+ dir, ext2fs_dirent_name_len(dirent), 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 = is->rfs->old_fs->now ?
+ is->rfs->old_fs->now : time(0);
+ is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
+ if (is->err)
+ return ret | DIRENT_ABORT;
+ }
+
+ return ret | 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_count2(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;
+ }
+
+ rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
+ retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
+ DIRENT_FLAG_INCLUDE_EMPTY, 0,
+ check_and_change_inodes, &is);
+ rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
+ if (retval)
+ goto errout;
+ if (is.err) {
+ retval = is.err;
+ goto errout;
+ }
+
+ if (rfs->progress && (is.num < is.max_dirs))
+ (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
+ is.max_dirs, is.max_dirs);
+
+errout:
+ ext2fs_free_extent_table(rfs->imap);
+ rfs->imap = 0;
+ 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;
+ long long diff;
+ dgrp_t i, max_groups;
+ ext2_filsys fs = rfs->new_fs;
+ char *cp;
+ blk64_t old_blk, new_blk, blk, cluster_freed;
+ errcode_t retval;
+ int to_move, moved;
+ unsigned int j;
+ ext2fs_block_bitmap new_bmap = NULL;
+
+ 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;
+ }
+
+ if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
+ retval = ext2fs_allocate_block_bitmap(fs, _("new meta blocks"),
+ &new_bmap);
+ if (retval)
+ return retval;
+
+ retval = mark_table_blocks(fs, new_bmap);
+ if (retval)
+ goto errout;
+ }
+
+ /*
+ * Figure out how many inode tables we need to move
+ */
+ to_move = moved = 0;
+ for (i=0; i < max_groups; i++)
+ if (ext2fs_inode_table_loc(rfs->old_fs, i) !=
+ ext2fs_inode_table_loc(fs, i))
+ to_move++;
+
+ if (to_move == 0) {
+ retval = 0;
+ goto errout;
+ }
+
+ 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 = ext2fs_inode_table_loc(rfs->old_fs, i);
+ new_blk = ext2fs_inode_table_loc(fs, i);
+ diff = new_blk - old_blk;
+
+#ifdef RESIZE2FS_DEBUG
+ if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
+ printf("Itable move group %d block %llu->%llu (diff %lld)\n",
+ i, (unsigned long long) old_blk,
+ (unsigned long long) new_blk, diff);
+#endif
+
+ if (!diff)
+ continue;
+ if (diff < 0)
+ diff = 0;
+
+ retval = io_channel_read_blk64(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_blk64(fs->io, new_blk,
+ num, rfs->itable_buf);
+ if (retval) {
+ io_channel_write_blk64(fs->io, old_blk,
+ num, rfs->itable_buf);
+ goto errout;
+ }
+ if (n > diff) {
+ retval = io_channel_write_blk64(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 = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
+ j < fs->inode_blocks_per_group;) {
+ if (new_bmap == NULL ||
+ !ext2fs_test_block_bitmap2(new_bmap, blk)) {
+ ext2fs_block_alloc_stats2(fs, blk, -1);
+ cluster_freed = EXT2FS_CLUSTER_RATIO(fs) -
+ (blk & EXT2FS_CLUSTER_MASK(fs));
+ blk += cluster_freed;
+ j += cluster_freed;
+ continue;
+ }
+ blk++;
+ j++;
+ }
+
+ ext2fs_inode_table_loc_set(rfs->old_fs, i, new_blk);
+ ext2fs_group_desc_csum_set(rfs->old_fs, i);
+ 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
+ retval = 0;
+
+errout:
+ if (new_bmap)
+ ext2fs_free_block_bitmap(new_bmap);
+ return retval;
+}
+
+/*
+ * This function is used when expanding a file system. It frees the
+ * superblock and block group descriptor blocks from the block group
+ * which is no longer the last block group.
+ */
+static errcode_t clear_sparse_super2_last_group(ext2_resize_t rfs)
+{
+ ext2_filsys fs = rfs->new_fs;
+ ext2_filsys old_fs = rfs->old_fs;
+ errcode_t retval;
+ dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
+ dgrp_t last_bg = fs->group_desc_count - 1;
+ blk64_t sb, old_desc;
+ blk_t num;
+
+ if (!ext2fs_has_feature_sparse_super2(fs->super))
+ return 0;
+
+ if (last_bg <= old_last_bg)
+ return 0;
+
+ if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
+ fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
+ return 0;
+
+ if (old_fs->super->s_backup_bgs[0] != old_last_bg &&
+ old_fs->super->s_backup_bgs[1] != old_last_bg)
+ return 0;
+
+ if (fs->super->s_backup_bgs[0] == old_last_bg ||
+ fs->super->s_backup_bgs[1] == old_last_bg)
+ return 0;
+
+ if (old_last_bg == 0)
+ return 0;
+
+ retval = ext2fs_super_and_bgd_loc2(rfs->old_fs, old_last_bg,
+ &sb, &old_desc, NULL, &num);
+ if (retval)
+ return retval;
+
+ if (sb)
+ ext2fs_unmark_block_bitmap2(fs->block_map, sb);
+ if (old_desc)
+ ext2fs_unmark_block_bitmap_range2(fs->block_map, old_desc, num);
+ return 0;
+}
+
+/*
+ * This function is used when shrinking a file system. We need to
+ * utilize blocks from what will be the new last block group for the
+ * backup superblock and block group descriptor blocks.
+ * Unfortunately, those blocks may be used by other files or fs
+ * metadata blocks. We need to mark them as being in use.
+ */
+static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
+ ext2fs_block_bitmap meta_bmap)
+{
+ ext2_filsys fs = rfs->new_fs;
+ ext2_filsys old_fs = rfs->old_fs;
+ errcode_t retval;
+ dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
+ dgrp_t last_bg = fs->group_desc_count - 1;
+ dgrp_t g;
+ blk64_t blk, sb, old_desc;
+ blk_t i, num;
+ int realloc = 0;
+
+ if (!ext2fs_has_feature_sparse_super2(fs->super))
+ return 0;
+
+ if (last_bg >= old_last_bg)
+ return 0;
+
+ if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
+ fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
+ return 0;
+
+ if (fs->super->s_backup_bgs[0] != last_bg &&
+ fs->super->s_backup_bgs[1] != last_bg)
+ return 0;
+
+ if (old_fs->super->s_backup_bgs[0] == last_bg ||
+ old_fs->super->s_backup_bgs[1] == last_bg)
+ return 0;
+
+ retval = ext2fs_super_and_bgd_loc2(rfs->new_fs, last_bg,
+ &sb, &old_desc, NULL, &num);
+ if (retval)
+ return retval;
+
+ if (last_bg && !sb) {
+ fputs(_("Should never happen! No sb in last super_sparse bg?\n"),
+ stderr);
+ exit(1);
+ }
+ if (old_desc && old_desc != sb+1) {
+ fputs(_("Should never happen! Unexpected old_desc in "
+ "super_sparse bg?\n"),
+ stderr);
+ exit(1);
+ }
+ num = (old_desc) ? num : 1;
+
+ /* Reserve the backup blocks */
+ ext2fs_mark_block_bitmap_range2(fs->block_map, sb, num);
+
+ for (g = 0; g < fs->group_desc_count; g++) {
+ blk64_t mb;
+
+ mb = ext2fs_block_bitmap_loc(fs, g);
+ if ((mb >= sb) && (mb < sb + num)) {
+ ext2fs_block_bitmap_loc_set(fs, g, 0);
+ realloc = 1;
+ }
+ mb = ext2fs_inode_bitmap_loc(fs, g);
+ if ((mb >= sb) && (mb < sb + num)) {
+ ext2fs_inode_bitmap_loc_set(fs, g, 0);
+ realloc = 1;
+ }
+ mb = ext2fs_inode_table_loc(fs, g);
+ if ((mb < sb + num) &&
+ (sb < mb + fs->inode_blocks_per_group)) {
+ ext2fs_inode_table_loc_set(fs, g, 0);
+ realloc = 1;
+ }
+ if (realloc) {
+ retval = ext2fs_allocate_group_table(fs, g, 0);
+ if (retval)
+ return retval;
+ }
+ }
+
+ for (blk = sb, i = 0; i < num; blk++, i++) {
+ if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
+ !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
+ ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
+ rfs->needed_blocks++;
+ }
+ ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
+ }
+ return 0;
+}
+
+/*
+ * Fix the resize inode
+ */
+static errcode_t fix_resize_inode(ext2_filsys fs)
+{
+ struct ext2_inode inode;
+ errcode_t retval;
+
+ if (!ext2fs_has_feature_resize_inode(fs->super))
+ return 0;
+
+ retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
+ if (retval) goto errout;
+
+ ext2fs_iblk_set(fs, &inode, 1);
+
+ 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, "%s",
+ _("Should never happen: resize inode corrupt!\n"));
+ exit(1);
+ }
+
+ retval = ext2fs_zero_blocks2(fs, inode.i_block[EXT2_DIND_BLOCK], 1,
+ NULL, NULL);
+ if (retval)
+ goto errout;
+
+ retval = ext2fs_create_resize_inode(fs);
+ if (retval)
+ goto errout;
+
+errout:
+ return retval;
+}
+
+/*
+ * Finally, recalculate the summary information
+ */
+static errcode_t resize2fs_calculate_summary_stats(ext2_filsys fs)
+{
+ errcode_t retval;
+ blk64_t blk = fs->super->s_first_data_block;
+ ext2_ino_t ino;
+ unsigned int n, group, count;
+ blk64_t total_clusters_free = 0;
+ int total_inodes_free = 0;
+ int group_free = 0;
+ int uninit = 0;
+ char *bitmap_buf;
+
+ /*
+ * First calculate the block statistics
+ */
+ bitmap_buf = malloc(fs->blocksize);
+ if (!bitmap_buf)
+ return ENOMEM;
+ for (group = 0; group < fs->group_desc_count;
+ group++) {
+ retval = ext2fs_get_block_bitmap_range2(fs->block_map,
+ B2C(blk), fs->super->s_clusters_per_group, bitmap_buf);
+ if (retval) {
+ free(bitmap_buf);
+ return retval;
+ }
+ n = ext2fs_bitcount(bitmap_buf,
+ fs->super->s_clusters_per_group / 8);
+ group_free = fs->super->s_clusters_per_group - n;
+ total_clusters_free += group_free;
+ ext2fs_bg_free_blocks_count_set(fs, group, group_free);
+ ext2fs_group_desc_csum_set(fs, group);
+ blk += fs->super->s_blocks_per_group;
+ }
+ free(bitmap_buf);
+ ext2fs_free_blocks_count_set(fs->super, C2B(total_clusters_free));
+
+ /*
+ * Next, calculate the inode statistics
+ */
+ group_free = 0;
+ count = 0;
+ group = 0;
+
+ /* Protect loop from wrap-around if s_inodes_count maxed */
+ uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
+ for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
+ if (uninit ||
+ !ext2fs_fast_test_inode_bitmap2(fs->inode_map, ino)) {
+ group_free++;
+ total_inodes_free++;
+ }
+ count++;
+ if ((count == fs->super->s_inodes_per_group) ||
+ (ino == fs->super->s_inodes_count)) {
+ ext2fs_bg_free_inodes_count_set(fs, group, group_free);
+ ext2fs_group_desc_csum_set(fs, group);
+ group++;
+ if (group >= fs->group_desc_count)
+ break;
+ count = 0;
+ group_free = 0;
+ uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
+ }
+ }
+ fs->super->s_free_inodes_count = total_inodes_free;
+ ext2fs_mark_super_dirty(fs);
+ return 0;
+}
+
+/*
+ * Journal may have been relocated; update the backup journal blocks
+ * in the superblock.
+ */
+static errcode_t fix_sb_journal_backup(ext2_filsys fs)
+{
+ errcode_t retval;
+ struct ext2_inode inode;
+
+ if (!ext2fs_has_feature_journal(fs->super))
+ return 0;
+
+ /* External journal? Nothing to do. */
+ if (fs->super->s_journal_dev && !fs->super->s_journal_inum)
+ return 0;
+
+ retval = ext2fs_read_inode(fs, fs->super->s_journal_inum, &inode);
+ if (retval)
+ return retval;
+ memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
+ fs->super->s_jnl_blocks[15] = inode.i_size_high;
+ fs->super->s_jnl_blocks[16] = inode.i_size;
+ fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
+ ext2fs_mark_super_dirty(fs);
+ return 0;
+}
+
+static int calc_group_overhead(ext2_filsys fs, blk64_t grp,
+ int old_desc_blocks)
+{
+ blk64_t super_blk, old_desc_blk, new_desc_blk;
+ int overhead;
+
+ /* inode table blocks plus allocation bitmaps */
+ overhead = fs->inode_blocks_per_group + 2;
+
+ ext2fs_super_and_bgd_loc2(fs, grp, &super_blk,
+ &old_desc_blk, &new_desc_blk, 0);
+ if ((grp == 0) || super_blk)
+ overhead++;
+ if (old_desc_blk)
+ overhead += old_desc_blocks;
+ else if (new_desc_blk)
+ overhead++;
+ return overhead;
+}
+
+
+/*
+ * calculate the minimum number of blocks the given fs can be resized to
+ */
+blk64_t calculate_minimum_resize_size(ext2_filsys fs, int flags)
+{
+ ext2_ino_t inode_count;
+ dgrp_t groups, flex_groups;
+ blk64_t blks_needed, data_blocks;
+ blk64_t grp, data_needed, last_start;
+ blk64_t overhead = 0;
+ int old_desc_blocks;
+ unsigned flexbg_size = 1U << fs->super->s_log_groups_per_flex;
+
+ /*
+ * first figure out how many group descriptors we need to
+ * handle the number of inodes we have
+ */
+ inode_count = fs->super->s_inodes_count -
+ fs->super->s_free_inodes_count;
+ blks_needed = ext2fs_div_ceil(inode_count,
+ fs->super->s_inodes_per_group) *
+ (blk64_t) EXT2_BLOCKS_PER_GROUP(fs->super);
+ groups = ext2fs_div64_ceil(blks_needed,
+ EXT2_BLOCKS_PER_GROUP(fs->super));
+#ifdef RESIZE2FS_DEBUG
+ if (flags & RESIZE_DEBUG_MIN_CALC)
+ printf("fs has %d inodes, %d groups required.\n",
+ inode_count, groups);
+#endif
+
+ /*
+ * number of old-style block group descriptor blocks
+ */
+ if (ext2fs_has_feature_meta_bg(fs->super))
+ old_desc_blocks = fs->super->s_first_meta_bg;
+ else
+ old_desc_blocks = fs->desc_blocks +
+ fs->super->s_reserved_gdt_blocks;
+
+ /* calculate how many blocks are needed for data */
+ data_needed = ext2fs_blocks_count(fs->super);
+ for (grp = 0; grp < fs->group_desc_count; grp++) {
+ __u32 n = ext2fs_bg_free_blocks_count(fs, grp);
+
+ if (n > EXT2_BLOCKS_PER_GROUP(fs->super))
+ n = EXT2_BLOCKS_PER_GROUP(fs->super);
+ n += calc_group_overhead(fs, grp, old_desc_blocks);
+ if (data_needed < n) {
+ if (flags & RESIZE_DEBUG_MIN_CALC)
+ printf("file system appears inconsistent?!?\n");
+ return ext2fs_blocks_count(fs->super);
+ }
+ data_needed -= n;
+ }
+#ifdef RESIZE2FS_DEBUG
+ if (flags & RESIZE_DEBUG_MIN_CALC)
+ printf("fs requires %llu data blocks.\n",
+ (unsigned long long) data_needed);
+#endif
+
+ /*
+ * For ext4 we need to allow for up to a flex_bg worth of
+ * inode tables of slack space so the resize operation can be
+ * guaranteed to finish.
+ */
+ flex_groups = groups;
+ if (ext2fs_has_feature_flex_bg(fs->super)) {
+ dgrp_t remainder = groups & (flexbg_size - 1);
+
+ flex_groups += flexbg_size - remainder;
+ if (flex_groups > fs->group_desc_count)
+ flex_groups = fs->group_desc_count;
+ }
+
+ /*
+ * figure out how many data blocks we have given the number of groups
+ * we need for our inodes
+ */
+ data_blocks = EXT2_GROUPS_TO_BLOCKS(fs->super, groups);
+ last_start = 0;
+ for (grp = 0; grp < flex_groups; grp++) {
+ overhead = calc_group_overhead(fs, grp, old_desc_blocks);
+
+ /*
+ * we want to keep track of how much data we can store in
+ * the groups leading up to the last group so we can determine
+ * how big the last group needs to be
+ */
+ if (grp < (groups - 1))
+ last_start += EXT2_BLOCKS_PER_GROUP(fs->super) -
+ overhead;
+
+ if (data_blocks > overhead)
+ data_blocks -= overhead;
+ else
+ data_blocks = 0;
+ }
+#ifdef RESIZE2FS_DEBUG
+ if (flags & RESIZE_DEBUG_MIN_CALC)
+ printf("With %d group(s), we have %llu blocks available.\n",
+ groups, (unsigned long long) data_blocks);
+#endif
+
+ /*
+ * if we need more group descriptors in order to accommodate our data
+ * then we need to add them here
+ */
+ blks_needed = data_needed;
+ while (blks_needed > data_blocks) {
+ blk64_t remainder = blks_needed - data_blocks;
+ dgrp_t extra_grps;
+
+ /* figure out how many more groups we need for the data */
+ extra_grps = ext2fs_div64_ceil(remainder,
+ EXT2_BLOCKS_PER_GROUP(fs->super));
+
+ data_blocks += EXT2_GROUPS_TO_BLOCKS(fs->super, extra_grps);
+
+ /* ok we have to account for the last group */
+ overhead = calc_group_overhead(fs, groups-1, old_desc_blocks);
+ last_start += EXT2_BLOCKS_PER_GROUP(fs->super) - overhead;
+
+ grp = flex_groups;
+ groups += extra_grps;
+ if (!ext2fs_has_feature_flex_bg(fs->super))
+ flex_groups = groups;
+ else if (groups > flex_groups) {
+ dgrp_t r = groups & (flexbg_size - 1);
+
+ flex_groups = groups + flexbg_size - r;
+ if (flex_groups > fs->group_desc_count)
+ flex_groups = fs->group_desc_count;
+ }
+
+ for (; grp < flex_groups; grp++) {
+ overhead = calc_group_overhead(fs, grp,
+ old_desc_blocks);
+
+ /*
+ * again, we need to see how much data we cram into
+ * all of the groups leading up to the last group
+ */
+ if (grp < groups - 1)
+ last_start += EXT2_BLOCKS_PER_GROUP(fs->super)
+ - overhead;
+
+ data_blocks -= overhead;
+ }
+
+#ifdef RESIZE2FS_DEBUG
+ if (flags & RESIZE_DEBUG_MIN_CALC)
+ printf("Added %d extra group(s), "
+ "blks_needed %llu, data_blocks %llu, "
+ "last_start %llu\n", extra_grps,
+ (unsigned long long) blks_needed,
+ (unsigned long long) data_blocks,
+ (unsigned long long) last_start);
+#endif
+ }
+
+ /* now for the fun voodoo */
+ grp = groups - 1;
+ if (ext2fs_has_feature_flex_bg(fs->super) &&
+ (grp & ~(flexbg_size - 1)) == 0)
+ grp = grp & ~(flexbg_size - 1);
+ overhead = 0;
+ for (; grp < flex_groups; grp++)
+ overhead += calc_group_overhead(fs, grp, old_desc_blocks);
+
+#ifdef RESIZE2FS_DEBUG
+ if (flags & RESIZE_DEBUG_MIN_CALC)
+ printf("Last group's overhead is %llu\n",
+ (unsigned long long) overhead);
+#endif
+
+ /*
+ * if this is the case then the last group is going to have data in it
+ * so we need to adjust the size of the last group accordingly
+ */
+ if (last_start < blks_needed) {
+ blk64_t remainder = blks_needed - last_start;
+
+#ifdef RESIZE2FS_DEBUG
+ if (flags & RESIZE_DEBUG_MIN_CALC)
+ printf("Need %llu data blocks in last group\n",
+ (unsigned long long) remainder);
+#endif
+ /*
+ * 50 is a magic number that mkfs/resize uses to see if its
+ * even worth making/resizing the fs. basically you need to
+ * have at least 50 blocks in addition to the blocks needed
+ * for the metadata in the last group
+ */
+ if (remainder > 50)
+ overhead += remainder;
+ else
+ overhead += 50;
+ } else
+ overhead += 50;
+
+ overhead += fs->super->s_first_data_block;
+#ifdef RESIZE2FS_DEBUG
+ if (flags & RESIZE_DEBUG_MIN_CALC)
+ printf("Final size of last group is %llu\n",
+ (unsigned long long) overhead);
+#endif
+
+ /* Add extra slack for bigalloc file systems */
+ if (EXT2FS_CLUSTER_RATIO(fs) > 1)
+ overhead += EXT2FS_CLUSTER_RATIO(fs) * 2;
+
+ /*
+ * since our last group doesn't have to be BLOCKS_PER_GROUP
+ * large, we only do groups-1, and then add the number of
+ * blocks needed to handle the group descriptor metadata+data
+ * that we need
+ */
+ blks_needed = EXT2_GROUPS_TO_BLOCKS(fs->super, groups - 1);
+ blks_needed += overhead;
+
+ /*
+ * Make sure blks_needed covers the end of the inode table in
+ * the last block group.
+ */
+ overhead = ext2fs_inode_table_loc(fs, groups-1) +
+ fs->inode_blocks_per_group;
+ if (blks_needed < overhead)
+ blks_needed = overhead;
+
+#ifdef RESIZE2FS_DEBUG
+ if (flags & RESIZE_DEBUG_MIN_CALC)
+ printf("Estimated blocks needed: %llu\n",
+ (unsigned long long) blks_needed);
+#endif
+
+ /*
+ * If at this point we've already added up more "needed" than
+ * the current size, just return current size as minimum.
+ */
+ if (blks_needed >= ext2fs_blocks_count(fs->super))
+ return ext2fs_blocks_count(fs->super);
+ /*
+ * We need to reserve a few extra blocks if extents are
+ * enabled, in case we need to grow the extent tree. The more
+ * we shrink the file system, the more space we need.
+ *
+ * The absolute worst case is every single data block is in
+ * the part of the file system that needs to be evacuated,
+ * with each data block needs to be in its own extent, and
+ * with each inode needing at least one extent block.
+ */
+ if (ext2fs_has_feature_extents(fs->super)) {
+ blk64_t safe_margin = (ext2fs_blocks_count(fs->super) -
+ blks_needed)/500;
+ unsigned int exts_per_blk = (fs->blocksize /
+ sizeof(struct ext3_extent)) - 1;
+ blk64_t worst_case = ((data_needed + exts_per_blk - 1) /
+ exts_per_blk);
+
+ if (worst_case < inode_count)
+ worst_case = inode_count;
+
+ if (safe_margin > worst_case)
+ safe_margin = worst_case;
+
+#ifdef RESIZE2FS_DEBUG
+ if (flags & RESIZE_DEBUG_MIN_CALC)
+ printf("Extents safety margin: %llu\n",
+ (unsigned long long) safe_margin);
+#endif
+ blks_needed += safe_margin;
+ }
+
+ return blks_needed;
+}