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f2fs: Keep alloc_valid_block_count in sync 

If we attempt to request more blocks than we have room for, we try to
instead request as much as we can, however, alloc_valid_block_count
is not decremented to match the new value, allowing it to drift higher
until the next checkpoint. This always decrements it when the requested
amount cannot be fulfilled.

Signed-off-by: Daniel Rosenberg <drosen@google.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Daniel Rosenberg 2018-07-09 20:32:42 -07:00 committed by Jaegeuk Kim
parent 20ee438232
commit 36b877af79
1 changed files with 4 additions and 2 deletions
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6
fs/f2fs/f2fs.h
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@ -1686,18 +1686,20 @@ static inline int inc_valid_block_count(struct f2fs_sb_info *sbi,
sbi->total_valid_block_count -= diff;
if (!*count) {
spin_unlock(&sbi->stat_lock);
percpu_counter_sub(&sbi->alloc_valid_block_count, diff);
goto enospc;
}
}
spin_unlock(&sbi->stat_lock);
if (unlikely(release))
if (unlikely(release)) {
percpu_counter_sub(&sbi->alloc_valid_block_count, release);
dquot_release_reservation_block(inode, release);
}
f2fs_i_blocks_write(inode, *count, true, true);
return 0;
enospc:
percpu_counter_sub(&sbi->alloc_valid_block_count, release);
dquot_release_reservation_block(inode, release);
return -ENOSPC;
}