Commit 9b4f2766 authored by Sahitya Tummala's avatar Sahitya Tummala Committed by Greg Kroah-Hartman

f2fs: do not use mutex lock in atomic context

[ Upstream commit 9083977d ]

Fix below warning coming because of using mutex lock in atomic context.

BUG: sleeping function called from invalid context at kernel/locking/mutex.c:98
in_atomic(): 1, irqs_disabled(): 0, pid: 585, name: sh
Preemption disabled at: __radix_tree_preload+0x28/0x130
Call trace:
 dump_backtrace+0x0/0x2b4
 show_stack+0x20/0x28
 dump_stack+0xa8/0xe0
 ___might_sleep+0x144/0x194
 __might_sleep+0x58/0x8c
 mutex_lock+0x2c/0x48
 f2fs_trace_pid+0x88/0x14c
 f2fs_set_node_page_dirty+0xd0/0x184

Do not use f2fs_radix_tree_insert() to avoid doing cond_resched() with
spin_lock() acquired.
Signed-off-by: default avatarSahitya Tummala <stummala@codeaurora.org>
Reviewed-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 20141feb
...@@ -17,7 +17,7 @@ ...@@ -17,7 +17,7 @@
#include "trace.h" #include "trace.h"
static RADIX_TREE(pids, GFP_ATOMIC); static RADIX_TREE(pids, GFP_ATOMIC);
static struct mutex pids_lock; static spinlock_t pids_lock;
static struct last_io_info last_io; static struct last_io_info last_io;
static inline void __print_last_io(void) static inline void __print_last_io(void)
...@@ -61,23 +61,29 @@ void f2fs_trace_pid(struct page *page) ...@@ -61,23 +61,29 @@ void f2fs_trace_pid(struct page *page)
set_page_private(page, (unsigned long)pid); set_page_private(page, (unsigned long)pid);
retry:
if (radix_tree_preload(GFP_NOFS)) if (radix_tree_preload(GFP_NOFS))
return; return;
mutex_lock(&pids_lock); spin_lock(&pids_lock);
p = radix_tree_lookup(&pids, pid); p = radix_tree_lookup(&pids, pid);
if (p == current) if (p == current)
goto out; goto out;
if (p) if (p)
radix_tree_delete(&pids, pid); radix_tree_delete(&pids, pid);
f2fs_radix_tree_insert(&pids, pid, current); if (radix_tree_insert(&pids, pid, current)) {
spin_unlock(&pids_lock);
radix_tree_preload_end();
cond_resched();
goto retry;
}
trace_printk("%3x:%3x %4x %-16s\n", trace_printk("%3x:%3x %4x %-16s\n",
MAJOR(inode->i_sb->s_dev), MINOR(inode->i_sb->s_dev), MAJOR(inode->i_sb->s_dev), MINOR(inode->i_sb->s_dev),
pid, current->comm); pid, current->comm);
out: out:
mutex_unlock(&pids_lock); spin_unlock(&pids_lock);
radix_tree_preload_end(); radix_tree_preload_end();
} }
...@@ -122,7 +128,7 @@ void f2fs_trace_ios(struct f2fs_io_info *fio, int flush) ...@@ -122,7 +128,7 @@ void f2fs_trace_ios(struct f2fs_io_info *fio, int flush)
void f2fs_build_trace_ios(void) void f2fs_build_trace_ios(void)
{ {
mutex_init(&pids_lock); spin_lock_init(&pids_lock);
} }
#define PIDVEC_SIZE 128 #define PIDVEC_SIZE 128
...@@ -150,7 +156,7 @@ void f2fs_destroy_trace_ios(void) ...@@ -150,7 +156,7 @@ void f2fs_destroy_trace_ios(void)
pid_t next_pid = 0; pid_t next_pid = 0;
unsigned int found; unsigned int found;
mutex_lock(&pids_lock); spin_lock(&pids_lock);
while ((found = gang_lookup_pids(pid, next_pid, PIDVEC_SIZE))) { while ((found = gang_lookup_pids(pid, next_pid, PIDVEC_SIZE))) {
unsigned idx; unsigned idx;
...@@ -158,5 +164,5 @@ void f2fs_destroy_trace_ios(void) ...@@ -158,5 +164,5 @@ void f2fs_destroy_trace_ios(void)
for (idx = 0; idx < found; idx++) for (idx = 0; idx < found; idx++)
radix_tree_delete(&pids, pid[idx]); radix_tree_delete(&pids, pid[idx]);
} }
mutex_unlock(&pids_lock); spin_unlock(&pids_lock);
} }
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