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Date: Fri, 24 Oct 2008 15:27:31 -0500
From: Eric Sandeen <sandeen@...hat.com>
To: ext4 development <linux-ext4@...r.kernel.org>
CC: Eric Paris <eparis@...hat.com>
Subject: [PATCH 1/2] 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: Eric Sandeen <sandeen@...hat.com>
---
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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