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Report free blocks in statfs

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Our statfs callback was still using the old buddy allocator.

We add a free segments field to the super and have it track the number
of free segments in the allocator.  We then use that to calculate the
number of free blocks for statfs.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2017-04-18 13:44:54 -07:00
parent 9f5e42f7dd
commit 6516ce7d57
4 changed files with 28 additions and 2 deletions
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kmod/src/alloc.c
+23 -1
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@@ -166,8 +166,10 @@ int scoutfs_alloc_segno(struct super_block *sb, u64 *segno)
ret = 0;
out:
if (ret == 0)
if (ret == 0) {
scoutfs_inc_counter(sb, alloc_alloc);
le64_add_cpu(&super->free_segs, -1);
}
up_write(&sal->rwsem);
trace_printk("segno %llu ret %d\n", *segno, ret);
@@ -180,6 +182,8 @@ out:
*/
int scoutfs_alloc_free(struct super_block *sb, u64 segno)
{
struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
struct scoutfs_super_block *super = &sbi->super;
struct pending_region *pend;
DECLARE_SEG_ALLOC(sb, sal);
u64 ind;
@@ -205,6 +209,7 @@ int scoutfs_alloc_free(struct super_block *sb, u64 segno)
set_bit_le(nr, pend->reg.bits);
scoutfs_inc_counter(sb, alloc_free);
le64_add_cpu(&super->free_segs, 1);
ret = 0;
out:
up_write(&sal->rwsem);
@@ -281,6 +286,23 @@ out:
return ret;
}
/*
* Return the number of blocks free for statfs.
*/
u64 scoutfs_alloc_bfree(struct super_block *sb)
{
struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
struct scoutfs_super_block *super = &sbi->super;
DECLARE_SEG_ALLOC(sb, sal);
u64 bfree;
down_read(&sal->rwsem);
bfree = le64_to_cpu(super->free_segs) << SCOUTFS_SEGMENT_BLOCK_SHIFT;
up_read(&sal->rwsem);
return bfree;
}
static int alloc_treap_compare(void *key, void *data)
{
u64 *ind = key;