[PATCH] xfs: remove kmem_zalloc_greedy

From: Darrick J. Wong
Date: Mon Mar 06 2017 - 13:42:44 EST


The sole remaining caller of kmem_zalloc_greedy is bulkstat, which uses
it to grab 1-4 pages for staging of inobt records. The infinite loop in
the greedy allocation function is causing hangs[1] in generic/269, so
just get rid of the greedy allocator in favor of kmem_zalloc_large.
This makes bulkstat somewhat more likely to ENOMEM if there's really no
pages to spare, but eliminates a source of hangs.

[1] https://lkml.org/lkml/2017/2/28/832

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/kmem.c | 18 ------------------
fs/xfs/kmem.h | 2 --
fs/xfs/xfs_itable.c | 14 ++++++++------
3 files changed, 8 insertions(+), 26 deletions(-)

diff --git a/fs/xfs/kmem.c b/fs/xfs/kmem.c
index 339c696..bb2beae 100644
--- a/fs/xfs/kmem.c
+++ b/fs/xfs/kmem.c
@@ -24,24 +24,6 @@
#include "kmem.h"
#include "xfs_message.h"

-/*
- * Greedy allocation. May fail and may return vmalloced memory.
- */
-void *
-kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize)
-{
- void *ptr;
- size_t kmsize = maxsize;
-
- while (!(ptr = vzalloc(kmsize))) {
- if ((kmsize >>= 1) <= minsize)
- kmsize = minsize;
- }
- if (ptr)
- *size = kmsize;
- return ptr;
-}
-
void *
kmem_alloc(size_t size, xfs_km_flags_t flags)
{
diff --git a/fs/xfs/kmem.h b/fs/xfs/kmem.h
index 689f746..f0fc84f 100644
--- a/fs/xfs/kmem.h
+++ b/fs/xfs/kmem.h
@@ -69,8 +69,6 @@ static inline void kmem_free(const void *ptr)
}


-extern void *kmem_zalloc_greedy(size_t *, size_t, size_t);
-
static inline void *
kmem_zalloc(size_t size, xfs_km_flags_t flags)
{
diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
index 8b2150d..283e76c 100644
--- a/fs/xfs/xfs_itable.c
+++ b/fs/xfs/xfs_itable.c
@@ -362,7 +362,6 @@ xfs_bulkstat(
xfs_agino_t agino; /* inode # in allocation group */
xfs_agnumber_t agno; /* allocation group number */
xfs_btree_cur_t *cur; /* btree cursor for ialloc btree */
- size_t irbsize; /* size of irec buffer in bytes */
xfs_inobt_rec_incore_t *irbuf; /* start of irec buffer */
int nirbuf; /* size of irbuf */
int ubcount; /* size of user's buffer */
@@ -389,11 +388,14 @@ xfs_bulkstat(
*ubcountp = 0;
*done = 0;

- irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4);
- if (!irbuf)
- return -ENOMEM;
-
- nirbuf = irbsize / sizeof(*irbuf);
+ nirbuf = (PAGE_SIZE * 4) / sizeof(*irbuf);
+ irbuf = kmem_zalloc_large(PAGE_SIZE * 4, KM_SLEEP);
+ if (!irbuf) {
+ irbuf = kmem_zalloc_large(PAGE_SIZE, KM_SLEEP);
+ if (!irbuf)
+ return -ENOMEM;
+ nirbuf /= 4;
+ }

/*
* Loop over the allocation groups, starting from the last