On x86 machines gd is unfortunately a #define, so we should avoid using gd for anything. This patch changes uses of gd to bgd so that ext4fs can be used on x86.
A better fix would be to remove the #define in x86, but I'm not sure how to do that.
Signed-off-by: Simon Glass sjg@chromium.org --- Changes in v2: - Don't change name of ext4fs_get_bgdtable() function - Drop warning patch, which seems to be due to a buggy compiler
fs/ext4/ext4_common.c | 85 ++++++++++++++++++++++-------------------- fs/ext4/ext4fs.c | 99 +++++++++++++++++++++++++------------------------ include/ext4fs.h | 2 +- 3 files changed, 95 insertions(+), 91 deletions(-)
diff --git a/fs/ext4/ext4_common.c b/fs/ext4/ext4_common.c index 3deffd5..d6d55b9 100644 --- a/fs/ext4/ext4_common.c +++ b/fs/ext4/ext4_common.c @@ -314,7 +314,7 @@ int ext4fs_checksum_update(unsigned int i) struct ext_filesystem *fs = get_fs(); __u16 crc = 0;
- desc = (struct ext2_block_group *)&fs->gd[i]; + desc = (struct ext2_block_group *)&fs->bgd[i]; if (fs->sb->feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) { int offset = offsetof(struct ext2_block_group, bg_checksum);
@@ -874,17 +874,17 @@ long int ext4fs_get_new_blk_no(void) char *zero_buffer = zalloc(fs->blksz); if (!journal_buffer || !zero_buffer) goto fail; - struct ext2_block_group *gd = (struct ext2_block_group *)fs->gdtable; + struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
if (fs->first_pass_bbmap == 0) { for (i = 0; i < fs->no_blkgrp; i++) { - if (gd[i].free_blocks) { - if (gd[i].bg_flags & EXT4_BG_BLOCK_UNINIT) { - put_ext4(((uint64_t) (gd[i].block_id * + if (bgd[i].free_blocks) { + if (bgd[i].bg_flags & EXT4_BG_BLOCK_UNINIT) { + put_ext4(((uint64_t) (bgd[i].block_id * fs->blksz)), zero_buffer, fs->blksz); - gd[i].bg_flags = - gd[i]. + bgd[i].bg_flags = + bgd[i]. bg_flags & ~EXT4_BG_BLOCK_UNINIT; memcpy(fs->blk_bmaps[i], zero_buffer, fs->blksz); @@ -897,16 +897,16 @@ long int ext4fs_get_new_blk_no(void) fs->curr_blkno = fs->curr_blkno + (i * fs->blksz * 8); fs->first_pass_bbmap++; - gd[i].free_blocks--; + bgd[i].free_blocks--; fs->sb->free_blocks--; - status = ext4fs_devread(gd[i].block_id * + status = ext4fs_devread(bgd[i].block_id * fs->sect_perblk, 0, fs->blksz, journal_buffer); if (status == 0) goto fail; if (ext4fs_log_journal(journal_buffer, - gd[i].block_id)) + bgd[i].block_id)) goto fail; goto success; } else { @@ -935,19 +935,19 @@ restart: if (bg_idx >= fs->no_blkgrp) goto fail;
- if (gd[bg_idx].free_blocks == 0) { + if (bgd[bg_idx].free_blocks == 0) { debug("block group %u is full. Skipping\n", bg_idx); fs->curr_blkno = fs->curr_blkno + blk_per_grp; fs->curr_blkno--; goto restart; }
- if (gd[bg_idx].bg_flags & EXT4_BG_BLOCK_UNINIT) { + if (bgd[bg_idx].bg_flags & EXT4_BG_BLOCK_UNINIT) { memset(zero_buffer, '\0', fs->blksz); - put_ext4(((uint64_t) (gd[bg_idx].block_id * fs->blksz)), - zero_buffer, fs->blksz); + put_ext4(((uint64_t) (bgd[bg_idx].block_id * + fs->blksz)), zero_buffer, fs->blksz); memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz); - gd[bg_idx].bg_flags = gd[bg_idx].bg_flags & + bgd[bg_idx].bg_flags = bgd[bg_idx].bg_flags & ~EXT4_BG_BLOCK_UNINIT; }
@@ -961,18 +961,18 @@ restart: /* journal backup */ if (prev_bg_bitmap_index != bg_idx) { memset(journal_buffer, '\0', fs->blksz); - status = ext4fs_devread(gd[bg_idx].block_id + status = ext4fs_devread(bgd[bg_idx].block_id * fs->sect_perblk, 0, fs->blksz, journal_buffer); if (status == 0) goto fail; if (ext4fs_log_journal(journal_buffer, - gd[bg_idx].block_id)) + bgd[bg_idx].block_id)) goto fail;
prev_bg_bitmap_index = bg_idx; } - gd[bg_idx].free_blocks--; + bgd[bg_idx].free_blocks--; fs->sb->free_blocks--; goto success; } @@ -1000,19 +1000,21 @@ int ext4fs_get_new_inode_no(void) char *zero_buffer = zalloc(fs->blksz); if (!journal_buffer || !zero_buffer) goto fail; - struct ext2_block_group *gd = (struct ext2_block_group *)fs->gdtable; + struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
if (fs->first_pass_ibmap == 0) { for (i = 0; i < fs->no_blkgrp; i++) { - if (gd[i].free_inodes) { - if (gd[i].bg_itable_unused != gd[i].free_inodes) - gd[i].bg_itable_unused = - gd[i].free_inodes; - if (gd[i].bg_flags & EXT4_BG_INODE_UNINIT) { + if (bgd[i].free_inodes) { + if (bgd[i].bg_itable_unused != + bgd[i].free_inodes) + bgd[i].bg_itable_unused = + bgd[i].free_inodes; + if (bgd[i].bg_flags & EXT4_BG_INODE_UNINIT) { put_ext4(((uint64_t) - (gd[i].inode_id * fs->blksz)), + (bgd[i].inode_id * + fs->blksz)), zero_buffer, fs->blksz); - gd[i].bg_flags = gd[i].bg_flags & + bgd[i].bg_flags = bgd[i].bg_flags & ~EXT4_BG_INODE_UNINIT; memcpy(fs->inode_bmaps[i], zero_buffer, fs->blksz); @@ -1025,17 +1027,17 @@ int ext4fs_get_new_inode_no(void) fs->curr_inode_no = fs->curr_inode_no + (i * inodes_per_grp); fs->first_pass_ibmap++; - gd[i].free_inodes--; - gd[i].bg_itable_unused--; + bgd[i].free_inodes--; + bgd[i].bg_itable_unused--; fs->sb->free_inodes--; - status = ext4fs_devread(gd[i].inode_id * + status = ext4fs_devread(bgd[i].inode_id * fs->sect_perblk, 0, fs->blksz, journal_buffer); if (status == 0) goto fail; if (ext4fs_log_journal(journal_buffer, - gd[i].inode_id)) + bgd[i].inode_id)) goto fail; goto success; } else @@ -1047,13 +1049,13 @@ restart: fs->curr_inode_no++; /* get the blockbitmap index respective to blockno */ ibmap_idx = fs->curr_inode_no / inodes_per_grp; - if (gd[ibmap_idx].bg_flags & EXT4_BG_INODE_UNINIT) { + if (bgd[ibmap_idx].bg_flags & EXT4_BG_INODE_UNINIT) { memset(zero_buffer, '\0', fs->blksz); - put_ext4(((uint64_t) (gd[ibmap_idx].inode_id * + put_ext4(((uint64_t) (bgd[ibmap_idx].inode_id * fs->blksz)), zero_buffer, fs->blksz); - gd[ibmap_idx].bg_flags = - gd[ibmap_idx].bg_flags & ~EXT4_BG_INODE_UNINIT; + bgd[ibmap_idx].bg_flags = + bgd[ibmap_idx].bg_flags & ~EXT4_BG_INODE_UNINIT; memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer, fs->blksz); } @@ -1069,21 +1071,22 @@ restart: /* journal backup */ if (prev_inode_bitmap_index != ibmap_idx) { memset(journal_buffer, '\0', fs->blksz); - status = ext4fs_devread(gd[ibmap_idx].inode_id + status = ext4fs_devread(bgd[ibmap_idx].inode_id * fs->sect_perblk, 0, fs->blksz, journal_buffer); if (status == 0) goto fail; if (ext4fs_log_journal(journal_buffer, - gd[ibmap_idx].inode_id)) + bgd[ibmap_idx].inode_id)) goto fail; prev_inode_bitmap_index = ibmap_idx; } - if (gd[ibmap_idx].bg_itable_unused != gd[ibmap_idx].free_inodes) - gd[ibmap_idx].bg_itable_unused = - gd[ibmap_idx].free_inodes; - gd[ibmap_idx].free_inodes--; - gd[ibmap_idx].bg_itable_unused--; + if (bgd[ibmap_idx].bg_itable_unused != + bgd[ibmap_idx].free_inodes) + bgd[ibmap_idx].bg_itable_unused = + bgd[ibmap_idx].free_inodes; + bgd[ibmap_idx].free_inodes--; + bgd[ibmap_idx].bg_itable_unused--; fs->sb->free_inodes--; goto success; } diff --git a/fs/ext4/ext4fs.c b/fs/ext4/ext4fs.c index 93dcb7e..3a5ef20 100644 --- a/fs/ext4/ext4fs.c +++ b/fs/ext4/ext4fs.c @@ -209,14 +209,14 @@ static void ext4fs_update(void)
/* update block groups */ for (i = 0; i < fs->no_blkgrp; i++) { - fs->gd[i].bg_checksum = ext4fs_checksum_update(i); - put_ext4((uint64_t)(fs->gd[i].block_id * fs->blksz), + fs->bgd[i].bg_checksum = ext4fs_checksum_update(i); + put_ext4((uint64_t)(fs->bgd[i].block_id * fs->blksz), fs->blk_bmaps[i], fs->blksz); }
/* update inode table groups */ for (i = 0; i < fs->no_blkgrp; i++) { - put_ext4((uint64_t) (fs->gd[i].inode_id * fs->blksz), + put_ext4((uint64_t) (fs->bgd[i].inode_id * fs->blksz), fs->inode_bmaps[i], fs->blksz); }
@@ -266,7 +266,7 @@ fail:
static void delete_single_indirect_block(struct ext2_inode *inode) { - struct ext2_block_group *gd = NULL; + struct ext2_block_group *bgd = NULL; static int prev_bg_bmap_idx = -1; long int blknr; int remainder; @@ -280,7 +280,7 @@ static void delete_single_indirect_block(struct ext2_inode *inode) return; } /* get block group descriptor table */ - gd = (struct ext2_block_group *)fs->gdtable; + bgd = (struct ext2_block_group *)fs->gdtable;
/* deleting the single indirect block associated with inode */ if (inode->b.blocks.indir_block != 0) { @@ -295,18 +295,18 @@ static void delete_single_indirect_block(struct ext2_inode *inode) bg_idx--; } ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx); - gd[bg_idx].free_blocks++; + bgd[bg_idx].free_blocks++; fs->sb->free_blocks++; /* journal backup */ if (prev_bg_bmap_idx != bg_idx) { status = - ext4fs_devread(gd[bg_idx].block_id * + ext4fs_devread(bgd[bg_idx].block_id * fs->sect_perblk, 0, fs->blksz, journal_buffer); if (status == 0) goto fail; if (ext4fs_log_journal - (journal_buffer, gd[bg_idx].block_id)) + (journal_buffer, bgd[bg_idx].block_id)) goto fail; prev_bg_bmap_idx = bg_idx; } @@ -326,7 +326,7 @@ static void delete_double_indirect_block(struct ext2_inode *inode) unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group; unsigned int *di_buffer = NULL; unsigned int *DIB_start_addr = NULL; - struct ext2_block_group *gd = NULL; + struct ext2_block_group *bgd = NULL; struct ext_filesystem *fs = get_fs(); char *journal_buffer = zalloc(fs->blksz); if (!journal_buffer) { @@ -334,7 +334,7 @@ static void delete_double_indirect_block(struct ext2_inode *inode) return; } /* get the block group descriptor table */ - gd = (struct ext2_block_group *)fs->gdtable; + bgd = (struct ext2_block_group *)fs->gdtable;
if (inode->b.blocks.double_indir_block != 0) { di_buffer = zalloc(fs->blksz); @@ -362,11 +362,11 @@ static void delete_double_indirect_block(struct ext2_inode *inode) ext4fs_reset_block_bmap(*di_buffer, fs->blk_bmaps[bg_idx], bg_idx); di_buffer++; - gd[bg_idx].free_blocks++; + bgd[bg_idx].free_blocks++; fs->sb->free_blocks++; /* journal backup */ if (prev_bg_bmap_idx != bg_idx) { - status = ext4fs_devread(gd[bg_idx].block_id + status = ext4fs_devread(bgd[bg_idx].block_id * fs->sect_perblk, 0, fs->blksz, journal_buffer); @@ -374,7 +374,7 @@ static void delete_double_indirect_block(struct ext2_inode *inode) goto fail;
if (ext4fs_log_journal(journal_buffer, - gd[bg_idx].block_id)) + bgd[bg_idx].block_id)) goto fail; prev_bg_bmap_idx = bg_idx; } @@ -391,19 +391,19 @@ static void delete_double_indirect_block(struct ext2_inode *inode) bg_idx--; } ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx); - gd[bg_idx].free_blocks++; + bgd[bg_idx].free_blocks++; fs->sb->free_blocks++; /* journal backup */ if (prev_bg_bmap_idx != bg_idx) { memset(journal_buffer, '\0', fs->blksz); - status = ext4fs_devread(gd[bg_idx].block_id * + status = ext4fs_devread(bgd[bg_idx].block_id * fs->sect_perblk, 0, fs->blksz, journal_buffer); if (status == 0) goto fail;
if (ext4fs_log_journal(journal_buffer, - gd[bg_idx].block_id)) + bgd[bg_idx].block_id)) goto fail; prev_bg_bmap_idx = bg_idx; } @@ -427,7 +427,7 @@ static void delete_triple_indirect_block(struct ext2_inode *inode) unsigned int *tib_start_addr = NULL; unsigned int *tip_buffer = NULL; unsigned int *tipb_start_addr = NULL; - struct ext2_block_group *gd = NULL; + struct ext2_block_group *bgd = NULL; struct ext_filesystem *fs = get_fs(); char *journal_buffer = zalloc(fs->blksz); if (!journal_buffer) { @@ -435,7 +435,7 @@ static void delete_triple_indirect_block(struct ext2_inode *inode) return; } /* get block group descriptor table */ - gd = (struct ext2_block_group *)fs->gdtable; + bgd = (struct ext2_block_group *)fs->gdtable;
if (inode->b.blocks.triple_indir_block != 0) { tigp_buffer = zalloc(fs->blksz); @@ -477,20 +477,21 @@ static void delete_triple_indirect_block(struct ext2_inode *inode) bg_idx);
tip_buffer++; - gd[bg_idx].free_blocks++; + bgd[bg_idx].free_blocks++; fs->sb->free_blocks++; /* journal backup */ if (prev_bg_bmap_idx != bg_idx) { status = - ext4fs_devread(gd[bg_idx].block_id * - fs->sect_perblk, 0, - fs->blksz, - journal_buffer); + ext4fs_devread( + bgd[bg_idx].block_id * + fs->sect_perblk, 0, + fs->blksz, + journal_buffer); if (status == 0) goto fail;
if (ext4fs_log_journal(journal_buffer, - gd[bg_idx]. + bgd[bg_idx]. block_id)) goto fail; prev_bg_bmap_idx = bg_idx; @@ -516,20 +517,20 @@ static void delete_triple_indirect_block(struct ext2_inode *inode) fs->blk_bmaps[bg_idx], bg_idx);
tigp_buffer++; - gd[bg_idx].free_blocks++; + bgd[bg_idx].free_blocks++; fs->sb->free_blocks++; /* journal backup */ if (prev_bg_bmap_idx != bg_idx) { memset(journal_buffer, '\0', fs->blksz); status = - ext4fs_devread(gd[bg_idx].block_id * + ext4fs_devread(bgd[bg_idx].block_id * fs->sect_perblk, 0, fs->blksz, journal_buffer); if (status == 0) goto fail;
if (ext4fs_log_journal(journal_buffer, - gd[bg_idx].block_id)) + bgd[bg_idx].block_id)) goto fail; prev_bg_bmap_idx = bg_idx; } @@ -546,19 +547,19 @@ static void delete_triple_indirect_block(struct ext2_inode *inode) bg_idx--; } ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx); - gd[bg_idx].free_blocks++; + bgd[bg_idx].free_blocks++; fs->sb->free_blocks++; /* journal backup */ if (prev_bg_bmap_idx != bg_idx) { memset(journal_buffer, '\0', fs->blksz); - status = ext4fs_devread(gd[bg_idx].block_id * + status = ext4fs_devread(bgd[bg_idx].block_id * fs->sect_perblk, 0, fs->blksz, journal_buffer); if (status == 0) goto fail;
if (ext4fs_log_journal(journal_buffer, - gd[bg_idx].block_id)) + bgd[bg_idx].block_id)) goto fail; prev_bg_bmap_idx = bg_idx; } @@ -590,13 +591,13 @@ static int ext4fs_delete_file(int inodeno) unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group; unsigned int inode_per_grp = ext4fs_root->sblock.inodes_per_group; struct ext2_inode *inode_buffer = NULL; - struct ext2_block_group *gd = NULL; + struct ext2_block_group *bgd = NULL; struct ext_filesystem *fs = get_fs(); char *journal_buffer = zalloc(fs->blksz); if (!journal_buffer) return -ENOMEM; /* get the block group descriptor table */ - gd = (struct ext2_block_group *)fs->gdtable; + bgd = (struct ext2_block_group *)fs->gdtable; status = ext4fs_read_inode(ext4fs_root, inodeno, &inode); if (status == 0) goto fail; @@ -631,19 +632,19 @@ static int ext4fs_delete_file(int inodeno) debug("EXT4_EXTENTS Block releasing %ld: %d\n", blknr, bg_idx);
- gd[bg_idx].free_blocks++; + bgd[bg_idx].free_blocks++; fs->sb->free_blocks++;
/* journal backup */ if (prev_bg_bmap_idx != bg_idx) { status = - ext4fs_devread(gd[bg_idx].block_id * + ext4fs_devread(bgd[bg_idx].block_id * fs->sect_perblk, 0, fs->blksz, journal_buffer); if (status == 0) goto fail; if (ext4fs_log_journal(journal_buffer, - gd[bg_idx].block_id)) + bgd[bg_idx].block_id)) goto fail; prev_bg_bmap_idx = bg_idx; } @@ -676,19 +677,19 @@ static int ext4fs_delete_file(int inodeno) bg_idx); debug("ActualB releasing %ld: %d\n", blknr, bg_idx);
- gd[bg_idx].free_blocks++; + bgd[bg_idx].free_blocks++; fs->sb->free_blocks++; /* journal backup */ if (prev_bg_bmap_idx != bg_idx) { memset(journal_buffer, '\0', fs->blksz); - status = ext4fs_devread(gd[bg_idx].block_id + status = ext4fs_devread(bgd[bg_idx].block_id * fs->sect_perblk, 0, fs->blksz, journal_buffer); if (status == 0) goto fail; if (ext4fs_log_journal(journal_buffer, - gd[bg_idx].block_id)) + bgd[bg_idx].block_id)) goto fail; prev_bg_bmap_idx = bg_idx; } @@ -701,7 +702,7 @@ static int ext4fs_delete_file(int inodeno)
/* get the block no */ inodeno--; - blkno = __le32_to_cpu(gd[ibmap_idx].inode_table_id) + + blkno = __le32_to_cpu(bgd[ibmap_idx].inode_table_id) + (inodeno % __le32_to_cpu(inode_per_grp)) / inodes_per_block;
/* get the offset of the inode */ @@ -731,15 +732,15 @@ static int ext4fs_delete_file(int inodeno) /* update the respective inode bitmaps */ inodeno++; ext4fs_reset_inode_bmap(inodeno, fs->inode_bmaps[ibmap_idx], ibmap_idx); - gd[ibmap_idx].free_inodes++; + bgd[ibmap_idx].free_inodes++; fs->sb->free_inodes++; /* journal backup */ memset(journal_buffer, '\0', fs->blksz); - status = ext4fs_devread(gd[ibmap_idx].inode_id * + status = ext4fs_devread(bgd[ibmap_idx].inode_id * fs->sect_perblk, 0, fs->blksz, journal_buffer); if (status == 0) goto fail; - if (ext4fs_log_journal(journal_buffer, gd[ibmap_idx].inode_id)) + if (ext4fs_log_journal(journal_buffer, bgd[ibmap_idx].inode_id)) goto fail;
ext4fs_update(); @@ -797,7 +798,7 @@ int ext4fs_init(void) printf("Error in getting the block group descriptor table\n"); goto fail; } - fs->gd = (struct ext2_block_group *)fs->gdtable; + fs->bgd = (struct ext2_block_group *)fs->gdtable;
/* load all the available bitmap block of the partition */ fs->blk_bmaps = zalloc(fs->no_blkgrp * sizeof(char *)); @@ -811,7 +812,7 @@ int ext4fs_init(void)
for (i = 0; i < fs->no_blkgrp; i++) { status = - ext4fs_devread(fs->gd[i].block_id * fs->sect_perblk, 0, + ext4fs_devread(fs->bgd[i].block_id * fs->sect_perblk, 0, fs->blksz, (char *)fs->blk_bmaps[i]); if (status == 0) goto fail; @@ -828,7 +829,7 @@ int ext4fs_init(void) }
for (i = 0; i < fs->no_blkgrp; i++) { - status = ext4fs_devread(fs->gd[i].inode_id * fs->sect_perblk, + status = ext4fs_devread(fs->bgd[i].inode_id * fs->sect_perblk, 0, fs->blksz, (char *)fs->inode_bmaps[i]); if (status == 0) @@ -842,7 +843,7 @@ int ext4fs_init(void) * reboot of a linux kernel */ for (i = 0; i < fs->no_blkgrp; i++) - real_free_blocks = real_free_blocks + fs->gd[i].free_blocks; + real_free_blocks = real_free_blocks + fs->bgd[i].free_blocks; if (real_free_blocks != fs->sb->free_blocks) fs->sb->free_blocks = real_free_blocks;
@@ -907,7 +908,7 @@ void ext4fs_deinit(void)
free(fs->gdtable); fs->gdtable = NULL; - fs->gd = NULL; + fs->bgd = NULL; /* * reinitiliazed the global inode and * block bitmap first execution check variables @@ -1087,7 +1088,7 @@ int ext4fs_write(const char *fname, unsigned char *buffer, goto fail; ibmap_idx = inodeno / ext4fs_root->sblock.inodes_per_group; inodeno--; - itable_blkno = __le32_to_cpu(fs->gd[ibmap_idx].inode_table_id) + + itable_blkno = __le32_to_cpu(fs->bgd[ibmap_idx].inode_table_id) + (inodeno % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; blkoff = (inodeno % inodes_per_block) * fs->inodesz; @@ -1105,7 +1106,7 @@ int ext4fs_write(const char *fname, unsigned char *buffer, } ibmap_idx = parent_inodeno / ext4fs_root->sblock.inodes_per_group; parent_inodeno--; - parent_itable_blkno = __le32_to_cpu(fs->gd[ibmap_idx].inode_table_id) + + parent_itable_blkno = __le32_to_cpu(fs->bgd[ibmap_idx].inode_table_id) + (parent_inodeno % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; blkoff = (parent_inodeno % inodes_per_block) * fs->inodesz; diff --git a/include/ext4fs.h b/include/ext4fs.h index b6eedde..23298fc 100644 --- a/include/ext4fs.h +++ b/include/ext4fs.h @@ -94,7 +94,7 @@ struct ext_filesystem { /* Superblock */ struct ext2_sblock *sb; /* Block group descritpor table */ - struct ext2_block_group *gd; + struct ext2_block_group *bgd; char *gdtable;
/* Block Bitmap Related */