UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity
OpenCloudOS-Kernel/include/linux/fs_pin.h

23 lines
520 B
C
Raw Normal View History

new fs_pin killing logics Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-01-11 06:53:21 +08:00
#include <linux/wait.h>
take fs_pin stuff to fs/* Add a new field to fs_pin - kill(pin). That's what umount and r/o remount will be calling for all pins attached to vfsmount and superblock resp. Called after bumping the refcount, so it won't go away under us. Dropping the refcount is responsibility of the instance. All generic stuff moved to fs/fs_pin.c; the next step will rip all the knowledge of kernel/acct.c from fs/super.c and fs/namespace.c. After that - death to mnt_pin(); it was intended to be usable as generic mechanism for code that wants to attach objects to vfsmount, so that they would not make the sucker busy and would get killed on umount. Never got it right; it remained acct.c-specific all along. Now it's very close to being killable. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07 20:39:04 +08:00
struct fs_pin {
new fs_pin killing logics Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-01-11 06:53:21 +08:00
wait_queue_head_t wait;
int done;
take count and rcu_head out of fs_pin Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-01-11 01:47:38 +08:00
struct hlist_node s_list;
struct hlist_node m_list;
take fs_pin stuff to fs/* Add a new field to fs_pin - kill(pin). That's what umount and r/o remount will be calling for all pins attached to vfsmount and superblock resp. Called after bumping the refcount, so it won't go away under us. Dropping the refcount is responsibility of the instance. All generic stuff moved to fs/fs_pin.c; the next step will rip all the knowledge of kernel/acct.c from fs/super.c and fs/namespace.c. After that - death to mnt_pin(); it was intended to be usable as generic mechanism for code that wants to attach objects to vfsmount, so that they would not make the sucker busy and would get killed on umount. Never got it right; it remained acct.c-specific all along. Now it's very close to being killable. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07 20:39:04 +08:00
void (*kill)(struct fs_pin *);
};
new fs_pin killing logics Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-01-11 06:53:21 +08:00
struct vfsmount;
static inline void init_fs_pin(struct fs_pin *p, void (*kill)(struct fs_pin *))
{
init_waitqueue_head(&p->wait);
p->kill = kill;
}
take fs_pin stuff to fs/* Add a new field to fs_pin - kill(pin). That's what umount and r/o remount will be calling for all pins attached to vfsmount and superblock resp. Called after bumping the refcount, so it won't go away under us. Dropping the refcount is responsibility of the instance. All generic stuff moved to fs/fs_pin.c; the next step will rip all the knowledge of kernel/acct.c from fs/super.c and fs/namespace.c. After that - death to mnt_pin(); it was intended to be usable as generic mechanism for code that wants to attach objects to vfsmount, so that they would not make the sucker busy and would get killed on umount. Never got it right; it remained acct.c-specific all along. Now it's very close to being killable. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07 20:39:04 +08:00
void pin_remove(struct fs_pin *);
allow attaching fs_pin to a group not associated with some superblock Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-01-11 23:57:27 +08:00
void pin_insert_group(struct fs_pin *, struct vfsmount *, struct hlist_head *);
take fs_pin stuff to fs/* Add a new field to fs_pin - kill(pin). That's what umount and r/o remount will be calling for all pins attached to vfsmount and superblock resp. Called after bumping the refcount, so it won't go away under us. Dropping the refcount is responsibility of the instance. All generic stuff moved to fs/fs_pin.c; the next step will rip all the knowledge of kernel/acct.c from fs/super.c and fs/namespace.c. After that - death to mnt_pin(); it was intended to be usable as generic mechanism for code that wants to attach objects to vfsmount, so that they would not make the sucker busy and would get killed on umount. Never got it right; it remained acct.c-specific all along. Now it's very close to being killable. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07 20:39:04 +08:00
void pin_insert(struct fs_pin *, struct vfsmount *);
new fs_pin killing logics Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-01-11 06:53:21 +08:00
void pin_kill(struct fs_pin *);