| Message ID | 1389835529-23944-1-git-send-email-dsterba@suse.cz (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
On 01/15/2014 08:25 PM, David Sterba wrote: > Help during debugging to export various interesting infromation and > tunables without the need of extra mount options or ioctls. > > Usage: > * declare your variable in sysfs.h, and include where you need it > * define the variable in sysfs.c and make it visible via > debugfs_create_TYPE > > Depends on CONFIG_DEBUG_FS. > > Signed-off-by: David Sterba <dsterba@suse.cz> > --- > fs/btrfs/sysfs.c | 23 +++++++++++++++++++++++ > 1 files changed, 23 insertions(+), 0 deletions(-) > > diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c > index ba94b277e98d..d0023196e996 100644 > --- a/fs/btrfs/sysfs.c > +++ b/fs/btrfs/sysfs.c > @@ -24,6 +24,7 @@ > #include <linux/kobject.h> > #include <linux/bug.h> > #include <linux/genhd.h> > +#include <linux/debugfs.h> > > #include "ctree.h" > #include "disk-io.h" > @@ -593,6 +594,12 @@ static int add_device_membership(struct btrfs_fs_info *fs_info) > /* /sys/fs/btrfs/ entry */ > static struct kset *btrfs_kset; > > +/* /sys/kernel/debug/btrfs */ > +static struct dentry *btrfs_debugfs_root_dentry; > + > +/* Debugging tunables and exported data */ > +u64 btrfs_debugfs_test; > + > int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) > { > int error; > @@ -636,6 +643,18 @@ failure: > return error; > } > > +static int btrfs_init_debugfs(void) > +{ > +#ifdef CONFIG_DEBUG_FS > + btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); > + if (!btrfs_debugfs_root_dentry) > + return -ENOMEM; > + > + debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry, > + &btrfs_debugfs_test); > +#endif Need to return a value. Josef -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index ba94b277e98d..d0023196e996 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -24,6 +24,7 @@ #include <linux/kobject.h> #include <linux/bug.h> #include <linux/genhd.h> +#include <linux/debugfs.h> #include "ctree.h" #include "disk-io.h" @@ -593,6 +594,12 @@ static int add_device_membership(struct btrfs_fs_info *fs_info) /* /sys/fs/btrfs/ entry */ static struct kset *btrfs_kset; +/* /sys/kernel/debug/btrfs */ +static struct dentry *btrfs_debugfs_root_dentry; + +/* Debugging tunables and exported data */ +u64 btrfs_debugfs_test; + int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) { int error; @@ -636,6 +643,18 @@ failure: return error; } +static int btrfs_init_debugfs(void) +{ +#ifdef CONFIG_DEBUG_FS + btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); + if (!btrfs_debugfs_root_dentry) + return -ENOMEM; + + debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry, + &btrfs_debugfs_test); +#endif +} + int btrfs_init_sysfs(void) { int ret; @@ -643,6 +662,7 @@ int btrfs_init_sysfs(void) if (!btrfs_kset) return -ENOMEM; + btrfs_init_debugfs(); init_feature_attrs(); ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); @@ -658,5 +678,8 @@ void btrfs_exit_sysfs(void) { sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); kset_unregister(btrfs_kset); +#ifdef CONFIG_DEBUG_FS + debugfs_remove_recursive(btrfs_debugfs_root_dentry); +#endif }
Help during debugging to export various interesting infromation and tunables without the need of extra mount options or ioctls. Usage: * declare your variable in sysfs.h, and include where you need it * define the variable in sysfs.c and make it visible via debugfs_create_TYPE Depends on CONFIG_DEBUG_FS. Signed-off-by: David Sterba <dsterba@suse.cz> --- fs/btrfs/sysfs.c | 23 +++++++++++++++++++++++ 1 files changed, 23 insertions(+), 0 deletions(-)