From: Valerie Clement <valerie.clement@xxxxxxxx>
In preparation for 64-bit support, this patch introduces new inline functions
to get block counts in the on-disk superblock.
If the EXT4_FEATURE_INCOMPAT_64BIT flag is not set, the functions return the
low 32 bits of block counters.
Changes from the previous version:
Replace macros definition by inline functions because some previous macros
evaluate their argument more than once.
Signed-off-by: Valerie Clement <valerie.clement@xxxxxxxx>
---
lib/ext2fs/ext2fs.h | 72 +++++++++++++++++++++++++++++++++++++++++++--------
1 files changed, 61 insertions(+), 11 deletions(-)
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 3aa9c8f..b60318c 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -1011,6 +1011,13 @@ extern blk_t ext2fs_group_last_block(ext2_filsys fs, dgrp_t group);
extern blk_t ext2fs_inode_data_blocks(ext2_filsys fs,
struct ext2_inode *inode);
extern unsigned int ext2fs_div_ceil(unsigned int a, unsigned int b);
+extern blk_t ext2_blocks_count(struct ext2_super_block *super);
+extern blk_t ext2_r_blocks_count(struct ext2_super_block *super);
+extern blk_t ext2_free_blocks_count(struct ext2_super_block *super);
+extern void ext2_blocks_count_set(struct ext2_super_block *super, blk_t blk);
+extern void ext2_r_blocks_count_set(struct ext2_super_block *super, blk_t blk);
+extern void ext2_free_blocks_count_set(struct ext2_super_block *super,
+ blk_t blk);
/*
* The actual inlined functions definitions themselves...
@@ -1184,17 +1191,6 @@ _INLINE_ blk_t ext2fs_group_first_block(ext2_filsys fs, dgrp_t group)
(group * fs->super->s_blocks_per_group);
}
-/*
- * Return the last block (inclusive) in a 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));
-}
-
_INLINE_ blk_t ext2fs_inode_data_blocks(ext2_filsys fs,
struct ext2_inode *inode)
{
@@ -1211,6 +1207,60 @@ _INLINE_ unsigned int ext2fs_div_ceil(unsigned int a, unsigned int b)
return 0;
return ((a - 1) / b) + 1;
}
+
+_INLINE_ blk_t ext2_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);
+}
+
+_INLINE_ blk_t ext2_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);
+}
+
+_INLINE_ blk_t ext2_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);
+}
+
+_INLINE_ void ext2_blocks_count_set(struct ext2_super_block *super, blk_t blk)
+{
+ super->s_blocks_count = blk;
+ if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
+ super->s_blocks_count_hi = (__u64) blk >> 32;
+}
+
+_INLINE_ void ext2_r_blocks_count_set(struct ext2_super_block *super, blk_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;
+}
+
+_INLINE_ void ext2_free_blocks_count_set(struct ext2_super_block *super,
+ blk_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 last block (inclusive) in a 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));
+}
#undef _INLINE_
#endif
-
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