| Message ID | 1438235311-23788-6-git-send-email-yangds.fnst@cn.fujitsu.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu 30-07-15 13:48:01, Dongsheng Yang wrote: > As we have cdev in superblock now, we can provide get_super_cdev > to get super_block by a cdev reference, similar with get_super > which is working only for block_device. The patch looks good to me. You can add: Reviewed-by: Jan Kara <jack@suse.com> Honza > > Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com> > --- > fs/super.c | 15 +++++++++++++++ > include/linux/fs.h | 1 + > 2 files changed, 16 insertions(+) > > diff --git a/fs/super.c b/fs/super.c > index 46fd1f1..4c56dff 100644 > --- a/fs/super.c > +++ b/fs/super.c > @@ -613,6 +613,21 @@ struct super_block *get_super(struct block_device *bdev) > } > EXPORT_SYMBOL(get_super); > > +static int cdev_compare(struct super_block *sb, void *key) > +{ > + return (sb->s_cdev == (struct cdev *)key); > +} > + > +/** > + * get_super_cdev - get the superblock of a cdev > + * @cdev: char device to get the superblock for > + */ > +struct super_block *get_super_cdev(struct cdev *cdev) > +{ > + return __get_super(cdev_compare, cdev); > +} > +EXPORT_SYMBOL(get_super_cdev); > + > /** > * get_super_thawed - get thawed superblock of a device > * @bdev: device to get the superblock for > diff --git a/include/linux/fs.h b/include/linux/fs.h > index 2f1d9499..e5ea425a 100644 > --- a/include/linux/fs.h > +++ b/include/linux/fs.h > @@ -2744,6 +2744,7 @@ extern void get_filesystem(struct file_system_type *fs); > extern void put_filesystem(struct file_system_type *fs); > extern struct file_system_type *get_fs_type(const char *name); > extern struct super_block *get_super(struct block_device *); > +extern struct super_block *get_super_cdev(struct cdev *); > extern struct super_block *get_super_thawed(struct block_device *); > extern struct super_block *get_active_super(struct block_device *bdev); > extern void drop_super(struct super_block *sb); > -- > 1.8.4.2 >
diff --git a/fs/super.c b/fs/super.c index 46fd1f1..4c56dff 100644 --- a/fs/super.c +++ b/fs/super.c @@ -613,6 +613,21 @@ struct super_block *get_super(struct block_device *bdev) } EXPORT_SYMBOL(get_super); +static int cdev_compare(struct super_block *sb, void *key) +{ + return (sb->s_cdev == (struct cdev *)key); +} + +/** + * get_super_cdev - get the superblock of a cdev + * @cdev: char device to get the superblock for + */ +struct super_block *get_super_cdev(struct cdev *cdev) +{ + return __get_super(cdev_compare, cdev); +} +EXPORT_SYMBOL(get_super_cdev); + /** * get_super_thawed - get thawed superblock of a device * @bdev: device to get the superblock for diff --git a/include/linux/fs.h b/include/linux/fs.h index 2f1d9499..e5ea425a 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2744,6 +2744,7 @@ extern void get_filesystem(struct file_system_type *fs); extern void put_filesystem(struct file_system_type *fs); extern struct file_system_type *get_fs_type(const char *name); extern struct super_block *get_super(struct block_device *); +extern struct super_block *get_super_cdev(struct cdev *); extern struct super_block *get_super_thawed(struct block_device *); extern struct super_block *get_active_super(struct block_device *bdev); extern void drop_super(struct super_block *sb);
As we have cdev in superblock now, we can provide get_super_cdev to get super_block by a cdev reference, similar with get_super which is working only for block_device. Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com> --- fs/super.c | 15 +++++++++++++++ include/linux/fs.h | 1 + 2 files changed, 16 insertions(+)