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Commit 8c3bf8a0 authored by Eric Sandeen's avatar Eric Sandeen Committed by Theodore Ts'o
Browse files

merge ext4_claim_free_blocks & ext4_has_free_blocks 



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: default avatarEric Sandeen <sandeen@redhat.com>
Reviewed-by: default avatarMingming Cao <cmm@us.ibm.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 6c20ec85

fs/ext4/balloc.c

+16 −41
Original line number Diff line number Diff line
@@ -589,8 +589,15 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode, 
	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_sb_info *sbi, 
	 */

	if (free_blocks < ((root_blocks + nblocks) + dirty_blocks))

		/* we don't have free space */

		return -ENOSPC;



	/* 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

fs/ext4/ext4.h

+1 −2
Original line number Diff line number Diff line
@@ -1003,8 +1003,7 @@ extern ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode, 
					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,