[PATCH 03/15][e2fsprogs] Add new blk64_t handling functions

Jose R. Santos
2008-07-15T16:51:13Z

From: Jose R. Santos <jrs@us.ibm.com>

Add new blk64_t handling functions

Add new blknum.c file which contains funtions to handle blk64_t and
low/high values in super blocks and inodes.

Signed-off-by: Jose R. Santos <jrs@us.ibm.com>
--

lib/ext2fs/Makefile.in | 1
lib/ext2fs/blknum.c | 214 ++++++++++++++++++++++++++++++++++++++++++++++++
lib/ext2fs/ext2fs.h | 33 +++++--
3 files changed, 237 insertions(+), 11 deletions(-)
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
--

lib/ext2fs/Makefile.in | 1
lib/ext2fs/blknum.c | 214 ++++++++++++++++++++++++++++++++++++++++++++++++
lib/ext2fs/ext2fs.h | 39 ++++++---
3 files changed, 243 insertions(+), 11 deletions(-)

diff --git a/lib/ext2fs/Makefile.in b/lib/ext2fs/Makefile.in
index 6f0ae62..3e7cbb9 100644
--- a/lib/ext2fs/Makefile.in
+++ b/lib/ext2fs/Makefile.in
@@ -26,6 +26,7 @@ OBJS= $(DEBUGFS_LIB_OBJS) $(RESIZE_LIB_OBJS) $(E2IMAGE_LIB_OBJS) \
bb_inode.o \
bitmaps.o \
bitops.o \
+ blknum.o \
block.o \
bmap.o \
check_desc.o \
diff --git a/lib/ext2fs/blknum.c b/lib/ext2fs/blknum.c
new file mode 100644
index 0000000..a09301e
--- /dev/null
+++ b/lib/ext2fs/blknum.c
@@ -0,0 +1,214 @@
+/*
+ * blknum.c --- Functions to handle blk64_t and high/low 64-bit block
+ * number.
+ *
+ * Copyright IBM Corporation, 2007
+ * Author Jose R. Santos <jrs@us.ibm.com>
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ */
+
+#include "ext2fs.h"
+
+/*
+ * Return the group # of a block
+ */
+dgrp_t ext2fs_group_of_blk2(ext2_filsys fs, blk64_t blk)
+{
+ return (blk - fs->super->s_first_data_block) /
+ fs->super->s_blocks_per_group;
+}
+
+/*
+ * Return the first block (inclusive) in a group
+ */
+blk64_t ext2fs_group_first_block2(ext2_filsys fs, dgrp_t group)
+{
+ return fs->super->s_first_data_block +
+ (group * fs->super->s_blocks_per_group);
+}
+
+/*
+ * Return the last block (inclusive) in a group
+ */
+blk64_t ext2fs_group_last_block2(ext2_filsys fs, dgrp_t group)
+{
+ return (group == fs->group_desc_count - 1 ?
+ ext2fs_blocks_count(fs->super) - 1 :
+ ext2fs_group_first_block2(fs, group) +
+ (fs->super->s_blocks_per_group - 1));
+}
+
+/*
+ * Return the inode data block count
+ */
+blk64_t ext2fs_inode_data_blocks2(ext2_filsys fs,
+ struct ext2_inode *inode)
+{
+ return (inode->i_blocks |
+ (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT ?
+ (__u64)inode->osd2.linux2.l_i_blocks_hi << 32 : 0)) -
+ (inode->i_file_acl ? fs->blocksize >> 9 : 0);
+}
+
+/*
+ * Return the fs block count
+ */
+blk64_t ext2fs_blocks_count(struct ext2_super_block *super)
+{
+ return super->s_blocks_count |
+ (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT ?
+ (__u64) super->s_blocks_count_hi << 32 : 0);
+}
+
+/*
+ * Set the fs block count
+ */
+void ext2fs_blocks_count_set(struct ext2_super_block *super, blk64_t blk)
+{
+ super->s_blocks_count = blk;
+ if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
+ super->s_blocks_count_hi = (__u64) blk >> 32;
+}
+
+/*
+ * Return the fs reserved block count
+ */
+blk64_t ext2fs_r_blocks_count(struct ext2_super_block *super)
+{
+ return super->s_r_blocks_count |
+ (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT ?
+ (__u64) super->s_r_blocks_count_hi << 32 : 0);
+}
+
+/*
+ * Set the fs reserved block count
+ */
+void ext2fs_r_blocks_count_set(struct ext2_super_block *super, blk64_t blk)
+{
+ super->s_r_blocks_count = blk;
+ if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
+ super->s_r_blocks_count_hi = (__u64) blk >> 32;
+}
+
+/*
+ * Return the fs free block count
+ */
+blk64_t ext2fs_free_blocks_count(struct ext2_super_block *super)
+{
+ return super->s_free_blocks_count |
+ (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT ?
+ (__u64) super->s_free_blocks_hi << 32 : 0);
+}
+
+/*
+ * Set the fs free block count
+ */
+void ext2fs_free_blocks_count_set(struct ext2_super_block *super, blk64_t blk)
+{
+ super->s_free_blocks_count = blk;
+ if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
+ super->s_free_blocks_hi = (__u64) blk >> 32;
+}
+
+/*
+ * Return the block bitmap block of a group
+ */
+blk64_t ext2fs_block_bitmap_loc(ext2_filsys fs, dgrp_t group)
+{
+ if (fs->super->s_desc_size >= EXT2_MIN_DESC_SIZE_64BIT) {
+ struct ext4_group_desc *gdp;
+ gdp = (struct ext4_group_desc *) (fs->group_desc) + group;
+
+ return gdp->bg_block_bitmap |
+ (fs->super->s_feature_incompat
+ & EXT4_FEATURE_INCOMPAT_64BIT ?
+ (__u64) gdp->bg_block_bitmap_hi << 32 : 0);
+ }
+
+ return fs->group_desc[group].bg_block_bitmap;
+}
+
+/*
+ * Set the block bitmap block of a group
+ */
+void ext2fs_block_bitmap_loc_set(ext2_filsys fs, dgrp_t group, blk64_t blk)
+{
+ if (fs->super->s_desc_size >= EXT2_MIN_DESC_SIZE_64BIT) {
+ struct ext4_group_desc *gdp;
+ gdp = (struct ext4_group_desc *) (fs->group_desc) + group;
+ gdp->bg_block_bitmap = blk;
+ if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
+ gdp->bg_block_bitmap_hi = (__u64) blk >> 32;
+ } else
+ fs->group_desc[group].bg_block_bitmap = blk;
+}
+
+/*
+ * Return the inode bitmap block of a group
+ */
+blk64_t ext2fs_inode_bitmap_loc(ext2_filsys fs, dgrp_t group)
+{
+ if (fs->super->s_desc_size >= EXT2_MIN_DESC_SIZE_64BIT) {
+ struct ext4_group_desc *gdp;
+ gdp = (struct ext4_group_desc *) (fs->group_desc) + group;
+
+ return gdp->bg_inode_bitmap |
+ (fs->super->s_feature_incompat
+ & EXT4_FEATURE_INCOMPAT_64BIT ?
+ (__u64) gdp->bg_inode_bitmap_hi << 32 : 0);
+ }
+
+ return fs->group_desc[group].bg_inode_bitmap;
+}
+
+/*
+ * Set the inode bitmap block of a group
+ */
+void ext2fs_inode_bitmap_loc_set(ext2_filsys fs, dgrp_t group, blk64_t blk)
+{
+ if (fs->super->s_desc_size >= EXT2_MIN_DESC_SIZE_64BIT) {
+ struct ext4_group_desc *gdp;
+ gdp = (struct ext4_group_desc *) (fs->group_desc) + group;
+ gdp->bg_inode_bitmap = blk;
+ if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
+ gdp->bg_inode_bitmap_hi = (__u64) blk >> 32;
+ } else
+ fs->group_desc[group].bg_inode_bitmap = blk;
+}
+
+/*
+ * Return the inode table block of a group
+ */
+blk64_t ext2fs_inode_table_loc(ext2_filsys fs, dgrp_t group)
+{
+ if (fs->super->s_desc_size >= EXT2_MIN_DESC_SIZE_64BIT) {
+ struct ext4_group_desc *gdp;
+ gdp = (struct ext4_group_desc *) (fs->group_desc) + group;
+
+ return gdp->bg_inode_table |
+ (fs->super->s_feature_incompat
+ & EXT4_FEATURE_INCOMPAT_64BIT ?
+ (__u64) gdp->bg_inode_table_hi << 32 : 0);
+ }
+
+ return fs->group_desc[group].bg_inode_table;
+}
+
+/*
+ * Set the inode table block of a group
+ */
+void ext2fs_inode_table_loc_set(ext2_filsys fs, dgrp_t group, blk64_t blk)
+{
+ if (fs->super->s_desc_size >= EXT2_MIN_DESC_SIZE_64BIT) {
+ struct ext4_group_desc *gdp;
+ gdp = (struct ext4_group_desc *) (fs->group_desc) + group;
+ gdp->bg_inode_table = blk;
+ if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
+ gdp->bg_inode_table_hi = (__u64) blk >> 32;
+ } else
+ fs->group_desc[group].bg_inode_table = blk;
+}
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index d9337aa..35cf0a3 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -682,6 +682,30 @@ extern errcode_t ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,
blk_t start, unsigned int num,
void *out);

+/* blknum.c */
+extern dgrp_t ext2fs_group_of_blk2(ext2_filsys fs, blk64_t);
+extern blk64_t ext2fs_group_first_block2(ext2_filsys fs, dgrp_t group);
+extern blk64_t ext2fs_group_last_block2(ext2_filsys fs, dgrp_t group);
+extern blk64_t ext2fs_inode_data_blocks2(ext2_filsys fs,
+ struct ext2_inode *inode);
+extern blk64_t ext2fs_blocks_count(struct ext2_super_block *super);
+extern void ext2fs_blocks_count_set(struct ext2_super_block *super,
+ blk64_t blk);
+extern blk64_t ext2fs_r_blocks_count(struct ext2_super_block *super);
+extern void ext2fs_r_blocks_count_set(struct ext2_super_block *super,
+ blk64_t blk);
+extern blk64_t ext2fs_free_blocks_count(struct ext2_super_block *super);
+extern void ext2fs_free_blocks_count_set(struct ext2_super_block *super,
+ blk64_t blk);
+extern blk64_t ext2fs_block_bitmap_loc(ext2_filsys fs, dgrp_t group);
+extern void ext2fs_block_bitmap_loc_set(ext2_filsys fs, dgrp_t group,
+ blk64_t blk);
+extern blk64_t ext2fs_inode_bitmap_loc(ext2_filsys fs, dgrp_t group);
+extern void ext2fs_inode_bitmap_loc_set(ext2_filsys fs, dgrp_t group,
+ blk64_t blk);
+extern blk64_t ext2fs_inode_table_loc(ext2_filsys fs, dgrp_t group);
+extern void ext2fs_inode_table_loc_set(ext2_filsys fs, dgrp_t group,
+ blk64_t blk);

/* block.c */
extern errcode_t ext2fs_block_iterate(ext2_filsys fs,
@@ -1316,10 +1340,8 @@ _INLINE_ int ext2fs_test_bb_dirty(ext2_filsys fs)
*/
_INLINE_ int ext2fs_group_of_blk(ext2_filsys fs, blk_t blk)
{
- return (blk - fs->super->s_first_data_block) /
- fs->super->s_blocks_per_group;
+ return ext2fs_group_of_blk2(fs, blk);
}
-
/*
* Return the group # of an inode number
*/
@@ -1333,8 +1355,7 @@ _INLINE_ int ext2fs_group_of_ino(ext2_filsys fs, ext2_ino_t ino)
*/
_INLINE_ blk_t ext2fs_group_first_block(ext2_filsys fs, dgrp_t group)
{
- return fs->super->s_first_data_block +
- (group * fs->super->s_blocks_per_group);
+ return ext2fs_group_first_block2(fs, group);
}

/*
@@ -1342,17 +1363,13 @@ _INLINE_ blk_t ext2fs_group_first_block(ext2_filsys fs, dgrp_t group)
*/
_INLINE_ blk_t ext2fs_group_last_block(ext2_filsys fs, dgrp_t group)
{
- return (group == fs->group_desc_count - 1 ?
- fs->super->s_blocks_count - 1 :
- ext2fs_group_first_block(fs, group) +
- (fs->super->s_blocks_per_group - 1));
+ return ext2fs_group_last_block2(fs, group);
}

_INLINE_ blk_t ext2fs_inode_data_blocks(ext2_filsys fs,
struct ext2_inode *inode)
{
- return inode->i_blocks -
- (inode->i_file_acl ? fs->blocksize >> 9 : 0);
+ return ext2fs_inode_data_blocks2(fs, inode);
}

/*