From: Theodore Ts'o Date: Fri, 9 Sep 2011 23:16:51 +0000 (-0400) Subject: ext4: rename ext4_has_free_blocks() to ext4_has_free_clusters() X-Git-Tag: firefly_0821_release~3680^2~4229^2~60 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=df55c99dc8ee4c3c886a5edc8a4aa6b131c95afc;p=firefly-linux-kernel-4.4.55.git ext4: rename ext4_has_free_blocks() to ext4_has_free_clusters() Rename the function so it is more clear what is going on. Also rename the various variables so it's clearer what's happening. Also fix a missing blocks to cluster conversion when reading the number of reserved blocks for root. Signed-off-by: "Theodore Ts'o" --- diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c index af0c5357e35a..f6dba4505f1c 100644 --- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -403,42 +403,43 @@ ext4_read_block_bitmap(struct super_block *sb, ext4_group_t block_group) } /** - * ext4_has_free_blocks() + * ext4_has_free_clusters() * @sbi: in-core super block structure. - * @nblocks: number of needed blocks + * @nclusters: number of needed blocks + * @flags: flags from ext4_mb_new_blocks() * - * Check if filesystem has nblocks free & available for allocation. + * Check if filesystem has nclusters free & available for allocation. * On success return 1, return 0 on failure. */ -static int ext4_has_free_blocks(struct ext4_sb_info *sbi, - s64 nblocks, unsigned int flags) +static int ext4_has_free_clusters(struct ext4_sb_info *sbi, + s64 nclusters, unsigned int flags) { - s64 free_blocks, dirty_blocks, root_blocks; + s64 free_clusters, dirty_clusters, root_clusters; struct percpu_counter *fcc = &sbi->s_freeclusters_counter; - struct percpu_counter *dbc = &sbi->s_dirtyclusters_counter; + struct percpu_counter *dcc = &sbi->s_dirtyclusters_counter; - free_blocks = percpu_counter_read_positive(fcc); - dirty_blocks = percpu_counter_read_positive(dbc); - root_blocks = ext4_r_blocks_count(sbi->s_es); + free_clusters = percpu_counter_read_positive(fcc); + dirty_clusters = percpu_counter_read_positive(dcc); + root_clusters = EXT4_B2C(sbi, ext4_r_blocks_count(sbi->s_es)); - if (free_blocks - (nblocks + root_blocks + dirty_blocks) < - EXT4_FREEBLOCKS_WATERMARK) { - free_blocks = EXT4_C2B(sbi, percpu_counter_sum_positive(fcc)); - dirty_blocks = percpu_counter_sum_positive(dbc); + if (free_clusters - (nclusters + root_clusters + dirty_clusters) < + EXT4_FREECLUSTERS_WATERMARK) { + free_clusters = EXT4_C2B(sbi, percpu_counter_sum_positive(fcc)); + dirty_clusters = percpu_counter_sum_positive(dcc); } - /* Check whether we have space after - * accounting for current dirty blocks & root reserved blocks. + /* Check whether we have space after accounting for current + * dirty clusters & root reserved clusters. */ - if (free_blocks >= ((root_blocks + nblocks) + dirty_blocks)) + if (free_clusters >= ((root_clusters + nclusters) + dirty_clusters)) return 1; - /* Hm, nope. Are (enough) root reserved blocks available? */ + /* Hm, nope. Are (enough) root reserved clusters available? */ if (sbi->s_resuid == current_fsuid() || ((sbi->s_resgid != 0) && in_group_p(sbi->s_resgid)) || capable(CAP_SYS_RESOURCE) || (flags & EXT4_MB_USE_ROOT_BLOCKS)) { - if (free_blocks >= (nblocks + dirty_blocks)) + if (free_clusters >= (nclusters + dirty_clusters)) return 1; } @@ -448,7 +449,7 @@ static int ext4_has_free_blocks(struct ext4_sb_info *sbi, int ext4_claim_free_clusters(struct ext4_sb_info *sbi, s64 nclusters, unsigned int flags) { - if (ext4_has_free_blocks(sbi, nclusters, flags)) { + if (ext4_has_free_clusters(sbi, nclusters, flags)) { percpu_counter_add(&sbi->s_dirtyclusters_counter, nclusters); return 0; } else @@ -469,7 +470,7 @@ int ext4_claim_free_clusters(struct ext4_sb_info *sbi, */ int ext4_should_retry_alloc(struct super_block *sb, int *retries) { - if (!ext4_has_free_blocks(EXT4_SB(sb), 1, 0) || + if (!ext4_has_free_clusters(EXT4_SB(sb), 1, 0) || (*retries)++ > 3 || !EXT4_SB(sb)->s_journal) return 0; diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index f97638634e34..21ea65d8bd46 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2103,13 +2103,13 @@ do { \ } while (0) #ifdef CONFIG_SMP -/* Each CPU can accumulate percpu_counter_batch blocks in their local - * counters. So we need to make sure we have free blocks more +/* Each CPU can accumulate percpu_counter_batch clusters in their local + * counters. So we need to make sure we have free clusters more * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. */ -#define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) +#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) #else -#define EXT4_FREEBLOCKS_WATERMARK 0 +#define EXT4_FREECLUSTERS_WATERMARK 0 #endif static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 557c34ffa05b..88dc63a01756 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -2255,7 +2255,7 @@ static int ext4_nonda_switch(struct super_block *sb) percpu_counter_read_positive(&sbi->s_freeclusters_counter)); dirty_blocks = percpu_counter_read_positive(&sbi->s_dirtyclusters_counter); if (2 * free_blocks < 3 * dirty_blocks || - free_blocks < (dirty_blocks + EXT4_FREEBLOCKS_WATERMARK)) { + free_blocks < (dirty_blocks + EXT4_FREECLUSTERS_WATERMARK)) { /* * free block count is less than 150% of dirty blocks * or free blocks is less than watermark