ext4: fix free space estimate in ext4_nonda_switch()

Values stored in s_freeclusters_counter and s_dirtyclusters_counter
are both in cluster units.  Remove the cluster to block conversion
applied to s_freeclusters_counter causing an inflated estimate of
free space because s_dirtyclusters_counter is not similarly
converted.  Rename free_blocks and dirty_blocks to better reflect
the units these variables contain to avoid future confusion.  This
fix corrects ENOSPC failures for xfstests 127 and 231 on bigalloc
file systems.

Signed-off-by: Eric Whitney <enwlinux@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index a29bfc2..f9b0b47 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2609,7 +2609,7 @@ out_writepages:
 
 static int ext4_nonda_switch(struct super_block *sb)
 {
-       s64 free_blocks, dirty_blocks;
+       s64 free_clusters, dirty_clusters;
        struct ext4_sb_info *sbi = EXT4_SB(sb);
 
        /*
@@ -2620,17 +2620,18 @@ static int ext4_nonda_switch(struct super_block *sb)
         * Delalloc need an accurate free block accounting. So switch
         * to non delalloc when we are near to error range.
         */
-       free_blocks  = EXT4_C2B(sbi,
-               percpu_counter_read_positive(&sbi->s_freeclusters_counter));
-       dirty_blocks = percpu_counter_read_positive(&sbi->s_dirtyclusters_counter);
+       free_clusters =
+               percpu_counter_read_positive(&sbi->s_freeclusters_counter);
+       dirty_clusters =
+               percpu_counter_read_positive(&sbi->s_dirtyclusters_counter);
        /*
         * Start pushing delalloc when 1/2 of free blocks are dirty.
         */
-       if (dirty_blocks && (free_blocks < 2 * dirty_blocks))
+       if (dirty_clusters && (free_clusters < 2 * dirty_clusters))
                try_to_writeback_inodes_sb(sb, WB_REASON_FS_FREE_SPACE);
 
-       if (2 * free_blocks < 3 * dirty_blocks ||
-               free_blocks < (dirty_blocks + EXT4_FREECLUSTERS_WATERMARK)) {
+       if (2 * free_clusters < 3 * dirty_clusters ||
+           free_clusters < (dirty_clusters + EXT4_FREECLUSTERS_WATERMARK)) {
                /*
                 * free block count is less than 150% of dirty blocks
                 * or free blocks is less than watermark