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authorIngo Molnar <mingo@elte.hu>2008-06-16 11:15:58 +0200
committerIngo Molnar <mingo@elte.hu>2008-06-16 11:15:58 +0200
commite765ee90da62535ac7d7a97f2464f9646539d683 (patch)
tree7a9cecce5aab958938e9a3bf46c2302d6af1958c /fs/ext4/balloc.c
parenta4500b84c51645bbc86be3ca84f2252b7ada060f (diff)
parent066519068ad2fbe98c7f45552b1f592903a9c8c8 (diff)
Diffstat (limited to 'fs/ext4/balloc.c')
-rw-r--r--fs/ext4/balloc.c71
1 files changed, 62 insertions, 9 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 30494c5da843..9cc80b9cc8d8 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -43,6 +43,46 @@ void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
}
+static int ext4_block_in_group(struct super_block *sb, ext4_fsblk_t block,
+ ext4_group_t block_group)
+{
+ ext4_group_t actual_group;
+ ext4_get_group_no_and_offset(sb, block, &actual_group, 0);
+ if (actual_group == block_group)
+ return 1;
+ return 0;
+}
+
+static int ext4_group_used_meta_blocks(struct super_block *sb,
+ ext4_group_t block_group)
+{
+ ext4_fsblk_t tmp;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ /* block bitmap, inode bitmap, and inode table blocks */
+ int used_blocks = sbi->s_itb_per_group + 2;
+
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) {
+ struct ext4_group_desc *gdp;
+ struct buffer_head *bh;
+
+ gdp = ext4_get_group_desc(sb, block_group, &bh);
+ if (!ext4_block_in_group(sb, ext4_block_bitmap(sb, gdp),
+ block_group))
+ used_blocks--;
+
+ if (!ext4_block_in_group(sb, ext4_inode_bitmap(sb, gdp),
+ block_group))
+ used_blocks--;
+
+ tmp = ext4_inode_table(sb, gdp);
+ for (; tmp < ext4_inode_table(sb, gdp) +
+ sbi->s_itb_per_group; tmp++) {
+ if (!ext4_block_in_group(sb, tmp, block_group))
+ used_blocks -= 1;
+ }
+ }
+ return used_blocks;
+}
/* Initializes an uninitialized block bitmap if given, and returns the
* number of blocks free in the group. */
unsigned ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
@@ -105,20 +145,34 @@ unsigned ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
free_blocks = group_blocks - bit_max;
if (bh) {
- ext4_fsblk_t start;
+ ext4_fsblk_t start, tmp;
+ int flex_bg = 0;
for (bit = 0; bit < bit_max; bit++)
ext4_set_bit(bit, bh->b_data);
start = ext4_group_first_block_no(sb, block_group);
- /* Set bits for block and inode bitmaps, and inode table */
- ext4_set_bit(ext4_block_bitmap(sb, gdp) - start, bh->b_data);
- ext4_set_bit(ext4_inode_bitmap(sb, gdp) - start, bh->b_data);
- for (bit = (ext4_inode_table(sb, gdp) - start),
- bit_max = bit + sbi->s_itb_per_group; bit < bit_max; bit++)
- ext4_set_bit(bit, bh->b_data);
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb,
+ EXT4_FEATURE_INCOMPAT_FLEX_BG))
+ flex_bg = 1;
+ /* Set bits for block and inode bitmaps, and inode table */
+ tmp = ext4_block_bitmap(sb, gdp);
+ if (!flex_bg || ext4_block_in_group(sb, tmp, block_group))
+ ext4_set_bit(tmp - start, bh->b_data);
+
+ tmp = ext4_inode_bitmap(sb, gdp);
+ if (!flex_bg || ext4_block_in_group(sb, tmp, block_group))
+ ext4_set_bit(tmp - start, bh->b_data);
+
+ tmp = ext4_inode_table(sb, gdp);
+ for (; tmp < ext4_inode_table(sb, gdp) +
+ sbi->s_itb_per_group; tmp++) {
+ if (!flex_bg ||
+ ext4_block_in_group(sb, tmp, block_group))
+ ext4_set_bit(tmp - start, bh->b_data);
+ }
/*
* Also if the number of blocks within the group is
* less than the blocksize * 8 ( which is the size
@@ -126,8 +180,7 @@ unsigned ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
*/
mark_bitmap_end(group_blocks, sb->s_blocksize * 8, bh->b_data);
}
-
- return free_blocks - sbi->s_itb_per_group - 2;
+ return free_blocks - ext4_group_used_meta_blocks(sb, block_group);
}