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f2fs: add spin_lock to cover radix operations in IO tracer 

This patch adds spin_lock to cover radix tree operations in IO tracer.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2015-01-07 14:07:36 -08:00
parent dd4e4b59b1
commit c05086506f
3 changed files with 19 additions and 3 deletions
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2
fs/f2fs/super.c
View File

@ -1222,6 +1222,8 @@ static int __init init_f2fs_fs(void)
{
int err;
f2fs_build_trace_ios();
err = init_inodecache();
if (err)
goto fail;

18
fs/f2fs/trace.c
View File

@ -15,7 +15,8 @@
#include "f2fs.h"
#include "trace.h"
RADIX_TREE(pids, GFP_NOIO);
RADIX_TREE(pids, GFP_ATOMIC);
spinlock_t pids_lock;
struct last_io_info last_io;
static inline void __print_last_io(void)
@ -58,9 +59,13 @@ void f2fs_trace_pid(struct page *page)
page->private = pid;
if (radix_tree_preload(GFP_NOFS))
return;
spin_lock(&pids_lock);
p = radix_tree_lookup(&pids, pid);
if (p == current)
return;
goto out;
if (p)
radix_tree_delete(&pids, pid);
@ -69,7 +74,9 @@ void f2fs_trace_pid(struct page *page)
trace_printk("%3x:%3x %4x %-16s\n",
MAJOR(inode->i_sb->s_dev), MINOR(inode->i_sb->s_dev),
pid, current->comm);
out:
spin_unlock(&pids_lock);
radix_tree_preload_end();
}
void f2fs_trace_ios(struct page *page, struct f2fs_io_info *fio, int flush)
@ -108,3 +115,8 @@ void f2fs_trace_ios(struct page *page, struct f2fs_io_info *fio, int flush)
last_io.len = 1;
return;
}
void f2fs_build_trace_ios(void)
{
spin_lock_init(&pids_lock);
}

2
fs/f2fs/trace.h
View File

@ -34,9 +34,11 @@ struct last_io_info {
extern void f2fs_trace_pid(struct page *);
extern void f2fs_trace_ios(struct page *, struct f2fs_io_info *, int);
extern void f2fs_build_trace_ios(void);
#else
#define f2fs_trace_pid(p)
#define f2fs_trace_ios(p, i, n)
#define f2fs_build_trace_ios()
#endif
#endif /* __F2FS_TRACE_H__ */