在 2008-10-24五的 15:27 -0500，Eric Sandeen写道：
> Mingming pointed out that ext4_claim_free_blocks & ext4_has_free_blocks
> are largely cut & pasted; they can be collapsed/merged as follows.
>
> Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
> ---
>
Reviewed-by: Mingming Cao <cmm@xxxxxxxxxx>
> Index: linux-2.6/fs/ext4/balloc.c
> ===================================================================
> --- linux-2.6.orig/fs/ext4/balloc.c 2008-10-24 15:04:51.672001367 -0500
> +++ linux-2.6/fs/ext4/balloc.c 2008-10-24 15:07:28.369001684 -0500
> @@ -589,8 +589,15 @@ void ext4_free_blocks(handle_t *handle,
> return;
> }
>
> -int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
> - s64 nblocks)
> +/**
> + * ext4_has_free_blocks()
> + * @sbi: in-core super block structure.
> + * @nblocks: number of needed blocks
> + *
> + * Check if filesystem has nblocks free & available for allocation.
> + * On success return 1, return 0 on failure.
> + */
> +int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks)
> {
> s64 free_blocks, dirty_blocks;
> s64 root_blocks = 0;
> @@ -620,53 +627,21 @@ int ext4_claim_free_blocks(struct ext4_s
> */
> if (free_blocks < ((root_blocks + nblocks) + dirty_blocks))
> /* we don't have free space */
> - return -ENOSPC;
> + return 0;
>
> - /* Add the blocks to nblocks */
> - percpu_counter_add(dbc, nblocks);
> - return 0;
> + return 1;
> }
>
> -/**
> - * ext4_has_free_blocks()
> - * @sbi: in-core super block structure.
> - * @nblocks: number of neeed blocks
> - *
> - * Check if filesystem has free blocks available for allocation.
> - * Return the number of blocks avaible for allocation for this request
> - * On success, return nblocks
> - */
> -ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
> +int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
> s64 nblocks)
> {
> - s64 free_blocks, dirty_blocks;
> - s64 root_blocks = 0;
> - struct percpu_counter *fbc = &sbi->s_freeblocks_counter;
> - struct percpu_counter *dbc = &sbi->s_dirtyblocks_counter;
> -
> - free_blocks = percpu_counter_read_positive(fbc);
> - dirty_blocks = percpu_counter_read_positive(dbc);
> -
> - if (!capable(CAP_SYS_RESOURCE) &&
> - sbi->s_resuid != current->fsuid &&
> - (sbi->s_resgid == 0 || !in_group_p(sbi->s_resgid)))
> - root_blocks = ext4_r_blocks_count(sbi->s_es);
> -
> - if (free_blocks - (nblocks + root_blocks + dirty_blocks) <
> - EXT4_FREEBLOCKS_WATERMARK) {
> - free_blocks = percpu_counter_sum(fbc);
> - dirty_blocks = percpu_counter_sum(dbc);
> - }
> - if (free_blocks <= (root_blocks + dirty_blocks))
> - /* we don't have free space */
> + if (ext4_has_free_blocks(sbi, nblocks)) {
> + percpu_counter_add(&sbi->s_dirtyblocks_counter, nblocks);
> return 0;
> -
> - if (free_blocks - (root_blocks + dirty_blocks) < nblocks)
> - return free_blocks - (root_blocks + dirty_blocks);
> - return nblocks;
> + } else
> + return -ENOSPC;
> }
>
> -
> /**
> * ext4_should_retry_alloc()
> * @sb: super block
> Index: linux-2.6/fs/ext4/ext4.h
> ===================================================================
> --- linux-2.6.orig/fs/ext4/ext4.h 2008-10-24 14:45:07.000000000 -0500
> +++ linux-2.6/fs/ext4/ext4.h 2008-10-24 15:05:22.227064688 -0500
> @@ -1003,8 +1003,7 @@ extern ext4_fsblk_t ext4_new_blocks(hand
> ext4_lblk_t iblock, ext4_fsblk_t goal,
> unsigned long *count, int *errp);
> extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
> -extern ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
> - s64 nblocks);
> +extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
> extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
> ext4_fsblk_t block, unsigned long count, int metadata);
> extern void ext4_free_blocks_sb(handle_t *handle, struct super_block *sb,
>
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