From: Dave Chinner <dchinner@xxxxxxxxxx>
During log recovery of an XFS filesystem with 64kB directory
buffers, rebuilding a buffer split across two log records results
in a memory allocation warning from krealloc like this:
xfs filesystem being mounted at /mnt/scratch supports timestamps until 2038 (0x7fffffff)
XFS (dm-0): Unmounting Filesystem
XFS (dm-0): Mounting V5 Filesystem
XFS (dm-0): Starting recovery (logdev: internal)
------------[ cut here ]------------
WARNING: CPU: 5 PID: 3435170 at mm/page_alloc.c:3539 get_page_from_freelist+0xdee/0xe40
.....
RIP: 0010:get_page_from_freelist+0xdee/0xe40
Call Trace:
? complete+0x3f/0x50
__alloc_pages+0x16f/0x300
alloc_pages+0x87/0x110
kmalloc_order+0x2c/0x90
kmalloc_order_trace+0x1d/0x90
__kmalloc_track_caller+0x215/0x270
? xlog_recover_add_to_cont_trans+0x63/0x1f0
krealloc+0x54/0xb0
xlog_recover_add_to_cont_trans+0x63/0x1f0
xlog_recovery_process_trans+0xc1/0xd0
xlog_recover_process_ophdr+0x86/0x130
xlog_recover_process_data+0x9f/0x160
xlog_recover_process+0xa2/0x120
xlog_do_recovery_pass+0x40b/0x7d0
? __irq_work_queue_local+0x4f/0x60
? irq_work_queue+0x3a/0x50
xlog_do_log_recovery+0x70/0x150
xlog_do_recover+0x38/0x1d0
xlog_recover+0xd8/0x170
xfs_log_mount+0x181/0x300
xfs_mountfs+0x4a1/0x9b0
xfs_fs_fill_super+0x3c0/0x7b0
get_tree_bdev+0x171/0x270
? suffix_kstrtoint.constprop.0+0xf0/0xf0
xfs_fs_get_tree+0x15/0x20
vfs_get_tree+0x24/0xc0
path_mount+0x2f5/0xaf0
__x64_sys_mount+0x108/0x140
do_syscall_64+0x3a/0x70
entry_SYSCALL_64_after_hwframe+0x44/0xae
Essentially, we are taking a multi-order allocation from kmem_alloc()
(which has an open coded no fail, no warn loop) and then
reallocating it out to 64kB using krealloc(__GFP_NOFAIL) and that is
then triggering the above warning.
This is a regression caused by converting this code from an open
coded no fail/no warn reallocation loop to using __GFP_NOFAIL.
What we actually need here is kvrealloc(), so that if contiguous
page allocation fails we fall back to vmalloc() and we don't
get nasty warnings happening in XFS.
Fixes: 771915c4f688 ("xfs: remove kmem_realloc()")
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
---
fs/xfs/xfs_log_recover.c | 2 +-
include/linux/mm.h | 2 ++
mm/util.c | 15 +++++++++++++++
3 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 1721fce2ec94..fee4fbadea0a 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -2062,7 +2062,7 @@ xlog_recover_add_to_cont_trans(
old_ptr = item->ri_buf[item->ri_cnt-1].i_addr;
old_len = item->ri_buf[item->ri_cnt-1].i_len;
- ptr = krealloc(old_ptr, len + old_len, GFP_KERNEL | __GFP_NOFAIL);
+ ptr = kvrealloc(old_ptr, old_len, len + old_len, GFP_KERNEL);
memcpy(&ptr[old_len], dp, len);
item->ri_buf[item->ri_cnt-1].i_len += len;
item->ri_buf[item->ri_cnt-1].i_addr = ptr;
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8ae31622deef..aa720bc0a1d0 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -827,6 +827,8 @@ static inline void *kvcalloc(size_t n, size_t size, gfp_t flags)
return kvmalloc_array(n, size, flags | __GFP_ZERO);
}
+extern void *kvrealloc(const void *p, size_t oldsize, size_t newsize,
+ gfp_t flags);
extern void kvfree(const void *addr);
extern void kvfree_sensitive(const void *addr, size_t len);
diff --git a/mm/util.c b/mm/util.c
index a8bf17f18a81..1104339ad2ca 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -635,6 +635,21 @@ void kvfree_sensitive(const void *addr, size_t len)
}
EXPORT_SYMBOL(kvfree_sensitive);
+void *kvrealloc(const void *p, size_t oldsize, size_t newsize, gfp_t flags)
+{
+ void *newp;
+
+ if (oldsize >= newsize)
+ return (void *)p;
+ newp = kvmalloc(newsize, flags);
+ if (!newp)
+ return NULL;
+ memcpy(newp, p, oldsize);
+ kvfree(p);
+ return newp;
+}
+EXPORT_SYMBOL(kvrealloc);
+
static inline void *__page_rmapping(struct page *page)
{
unsigned long mapping;
--
2.31.1
