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f2fs: do not use mutex lock in atomic context 

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: Sahitya Tummala <stummala@codeaurora.org>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
hifive-unleashed-5.1
Sahitya Tummala 2019-02-04 13:36:53 +05:30 committed by Jaegeuk Kim
parent c42d28ce3e
commit 9083977dab
1 changed files with 13 additions and 7 deletions
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20
fs/f2fs/trace.c
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@ -14,7 +14,7 @@
#include "trace.h"
static RADIX_TREE(pids, GFP_ATOMIC);
static struct mutex pids_lock;
static spinlock_t pids_lock;
static struct last_io_info last_io;
static inline void __print_last_io(void)
@ -58,23 +58,29 @@ void f2fs_trace_pid(struct page *page)
set_page_private(page, (unsigned long)pid);
retry:
if (radix_tree_preload(GFP_NOFS))
return;
mutex_lock(&pids_lock);
spin_lock(&pids_lock);
p = radix_tree_lookup(&pids, pid);
if (p == current)
goto out;
if (p)
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",
MAJOR(inode->i_sb->s_dev), MINOR(inode->i_sb->s_dev),
pid, current->comm);
out:
mutex_unlock(&pids_lock);
spin_unlock(&pids_lock);
radix_tree_preload_end();
}
@ -119,7 +125,7 @@ void f2fs_trace_ios(struct f2fs_io_info *fio, int flush)
void f2fs_build_trace_ios(void)
{
mutex_init(&pids_lock);
spin_lock_init(&pids_lock);
}
#define PIDVEC_SIZE 128
@ -147,7 +153,7 @@ void f2fs_destroy_trace_ios(void)
pid_t next_pid = 0;
unsigned int found;
mutex_lock(&pids_lock);
spin_lock(&pids_lock);
while ((found = gang_lookup_pids(pid, next_pid, PIDVEC_SIZE))) {
unsigned idx;
@ -155,5 +161,5 @@ void f2fs_destroy_trace_ios(void)
for (idx = 0; idx < found; idx++)
radix_tree_delete(&pids, pid[idx]);
}
mutex_unlock(&pids_lock);
spin_unlock(&pids_lock);
}