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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" <tytso@mit.edu>
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@ -403,42 +403,43 @@ ext4_read_block_bitmap(struct super_block *sb, ext4_group_t block_group)
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}
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/**
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* ext4_has_free_blocks()
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* ext4_has_free_clusters()
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* @sbi: in-core super block structure.
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* @nblocks: number of needed blocks
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* @nclusters: number of needed blocks
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* @flags: flags from ext4_mb_new_blocks()
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*
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* Check if filesystem has nblocks free & available for allocation.
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* Check if filesystem has nclusters free & available for allocation.
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* On success return 1, return 0 on failure.
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*/
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static int ext4_has_free_blocks(struct ext4_sb_info *sbi,
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s64 nblocks, unsigned int flags)
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static int ext4_has_free_clusters(struct ext4_sb_info *sbi,
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s64 nclusters, unsigned int flags)
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{
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s64 free_blocks, dirty_blocks, root_blocks;
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s64 free_clusters, dirty_clusters, root_clusters;
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struct percpu_counter *fcc = &sbi->s_freeclusters_counter;
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struct percpu_counter *dbc = &sbi->s_dirtyclusters_counter;
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struct percpu_counter *dcc = &sbi->s_dirtyclusters_counter;
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free_blocks = percpu_counter_read_positive(fcc);
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dirty_blocks = percpu_counter_read_positive(dbc);
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root_blocks = ext4_r_blocks_count(sbi->s_es);
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free_clusters = percpu_counter_read_positive(fcc);
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dirty_clusters = percpu_counter_read_positive(dcc);
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root_clusters = EXT4_B2C(sbi, ext4_r_blocks_count(sbi->s_es));
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if (free_blocks - (nblocks + root_blocks + dirty_blocks) <
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EXT4_FREEBLOCKS_WATERMARK) {
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free_blocks = EXT4_C2B(sbi, percpu_counter_sum_positive(fcc));
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dirty_blocks = percpu_counter_sum_positive(dbc);
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if (free_clusters - (nclusters + root_clusters + dirty_clusters) <
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EXT4_FREECLUSTERS_WATERMARK) {
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free_clusters = EXT4_C2B(sbi, percpu_counter_sum_positive(fcc));
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dirty_clusters = percpu_counter_sum_positive(dcc);
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}
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/* Check whether we have space after
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* accounting for current dirty blocks & root reserved blocks.
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/* Check whether we have space after accounting for current
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* dirty clusters & root reserved clusters.
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*/
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if (free_blocks >= ((root_blocks + nblocks) + dirty_blocks))
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if (free_clusters >= ((root_clusters + nclusters) + dirty_clusters))
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return 1;
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/* Hm, nope. Are (enough) root reserved blocks available? */
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/* Hm, nope. Are (enough) root reserved clusters available? */
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if (sbi->s_resuid == current_fsuid() ||
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((sbi->s_resgid != 0) && in_group_p(sbi->s_resgid)) ||
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capable(CAP_SYS_RESOURCE) ||
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(flags & EXT4_MB_USE_ROOT_BLOCKS)) {
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if (free_blocks >= (nblocks + dirty_blocks))
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if (free_clusters >= (nclusters + dirty_clusters))
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return 1;
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}
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@ -448,7 +449,7 @@ static int ext4_has_free_blocks(struct ext4_sb_info *sbi,
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int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
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s64 nclusters, unsigned int flags)
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{
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if (ext4_has_free_blocks(sbi, nclusters, flags)) {
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if (ext4_has_free_clusters(sbi, nclusters, flags)) {
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percpu_counter_add(&sbi->s_dirtyclusters_counter, nclusters);
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return 0;
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} else
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@ -469,7 +470,7 @@ int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
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*/
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int ext4_should_retry_alloc(struct super_block *sb, int *retries)
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{
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if (!ext4_has_free_blocks(EXT4_SB(sb), 1, 0) ||
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if (!ext4_has_free_clusters(EXT4_SB(sb), 1, 0) ||
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(*retries)++ > 3 ||
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!EXT4_SB(sb)->s_journal)
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return 0;
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@ -2103,13 +2103,13 @@ do { \
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} while (0)
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#ifdef CONFIG_SMP
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/* Each CPU can accumulate percpu_counter_batch blocks in their local
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* counters. So we need to make sure we have free blocks more
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/* Each CPU can accumulate percpu_counter_batch clusters in their local
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* counters. So we need to make sure we have free clusters more
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* than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
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*/
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#define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
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#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
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#else
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#define EXT4_FREEBLOCKS_WATERMARK 0
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#define EXT4_FREECLUSTERS_WATERMARK 0
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#endif
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static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
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@ -2255,7 +2255,7 @@ static int ext4_nonda_switch(struct super_block *sb)
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percpu_counter_read_positive(&sbi->s_freeclusters_counter));
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dirty_blocks = percpu_counter_read_positive(&sbi->s_dirtyclusters_counter);
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if (2 * free_blocks < 3 * dirty_blocks ||
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free_blocks < (dirty_blocks + EXT4_FREEBLOCKS_WATERMARK)) {
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free_blocks < (dirty_blocks + EXT4_FREECLUSTERS_WATERMARK)) {
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/*
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* free block count is less than 150% of dirty blocks
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* or free blocks is less than watermark
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