diff options
Diffstat (limited to 'fs/ext4/balloc.c')
| -rw-r--r-- | fs/ext4/balloc.c | 57 |
1 files changed, 16 insertions, 41 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c index b9821be709b..e28203ec45b 100644 --- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -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; + 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 |