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authorFrederic Weisbecker <fweisbec@gmail.com>2009-03-22 18:10:44 -0400
committerIngo Molnar <mingo@elte.hu>2009-03-23 11:25:46 -0400
commitc0f92ba99bdeaf35f9c580291b4e1a657c67fbd4 (patch)
treee3e102f83c9a7fe44935ff7cd57540f4b6dce9e4 /fs/debugfs/inode.c
parentb8b94265337f83b7db9c5f429b1769d463d7da8c (diff)
debugfs: function to know if debugfs is initialized
Impact: add new debugfs API With ftrace, some tracers are registered in early initcalls and attempt to create files on the debugfs filesystem. Depending on when they are activated, they can try to create their file at any time. Some checks can be done on the tracing area but providing a helper to know if debugfs is registered make it really more easy. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1237759847-21025-2-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'fs/debugfs/inode.c')
-rw-r--r--fs/debugfs/inode.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 81ae9ea3c6e1..0662ba6de85a 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -30,6 +30,7 @@
30 30
31static struct vfsmount *debugfs_mount; 31static struct vfsmount *debugfs_mount;
32static int debugfs_mount_count; 32static int debugfs_mount_count;
33static bool debugfs_registered;
33 34
34static struct inode *debugfs_get_inode(struct super_block *sb, int mode, dev_t dev) 35static struct inode *debugfs_get_inode(struct super_block *sb, int mode, dev_t dev)
35{ 36{
@@ -496,6 +497,16 @@ exit:
496} 497}
497EXPORT_SYMBOL_GPL(debugfs_rename); 498EXPORT_SYMBOL_GPL(debugfs_rename);
498 499
500/**
501 * debugfs_initialized - Tells whether debugfs has been registered
502 */
503bool debugfs_initialized(void)
504{
505 return debugfs_registered;
506}
507EXPORT_SYMBOL_GPL(debugfs_initialized);
508
509
499static struct kobject *debug_kobj; 510static struct kobject *debug_kobj;
500 511
501static int __init debugfs_init(void) 512static int __init debugfs_init(void)
@@ -509,11 +520,16 @@ static int __init debugfs_init(void)
509 retval = register_filesystem(&debug_fs_type); 520 retval = register_filesystem(&debug_fs_type);
510 if (retval) 521 if (retval)
511 kobject_put(debug_kobj); 522 kobject_put(debug_kobj);
523 else
524 debugfs_registered = true;
525
512 return retval; 526 return retval;
513} 527}
514 528
515static void __exit debugfs_exit(void) 529static void __exit debugfs_exit(void)
516{ 530{
531 debugfs_registered = false;
532
517 simple_release_fs(&debugfs_mount, &debugfs_mount_count); 533 simple_release_fs(&debugfs_mount, &debugfs_mount_count);
518 unregister_filesystem(&debug_fs_type); 534 unregister_filesystem(&debug_fs_type);
519 kobject_put(debug_kobj); 535 kobject_put(debug_kobj);