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- Add the mount flag MNTK_MPSAFE which indicates whether or not Giant

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must be held when any vnode owned by the filesystem is manipulated.
 - Add VFS_LOCK_GIANT and VFS_UNLOCK_GIANT macros which are used to
   conditionally lock and unlock Giant based on a particular mountpoint.
This commit is contained in:
Jeff Roberson 2005-01-24 09:53:46 +00:00
parent 8c74387334
commit db50d057fd
1 changed files with 24 additions and 0 deletions
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24
sys/sys/mount.h
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@ -170,6 +170,7 @@ struct vnode *__mnt_vnode_next(struct vnode **nvp, struct mount *mp);
#define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx)
#define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
#define MNT_MTX(mp) (&(mp)->mnt_mtx)
#endif /* _KERNEL */
@ -267,6 +268,7 @@ struct vnode *__mnt_vnode_next(struct vnode **nvp, struct mount *mp);
#define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
#define MNTK_SUSPEND 0x08000000 /* request write suspension */
#define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */
#define MNTK_MPSAFE 0x20000000 /* Filesystem is MPSAFE. */
/*
* Sysctl CTL_VFS definitions.
@ -525,6 +527,28 @@ vfs_statfs_t __vfs_statfs;
#define VFS_SYSCTL(MP, OP, REQ) \
(*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ)
extern int mpsafe_vfs;
#define VFS_NEEDSGIANT(MP) \
(!mpsafe_vfs || ((MP) != NULL && ((MP)->mnt_kern_flag & MNTK_MPSAFE) == 0))
#define VFS_LOCK_GIANT(MP) __extension__ \
({ \
int _locked; \
if (VFS_NEEDSGIANT((MP))) { \
mtx_lock(&Giant); \
_locked = 1; \
} else \
_locked = 0; \
_locked; \
})
#define VFS_UNLOCK_GIANT(locked) if ((locked)) mtx_unlock(&Giant);
#define VFS_ASSERT_GIANT(MP) do \
{ \
if (VFS_NEEDSGIANT((MP))) \
mtx_assert(&Giant, MA_OWNED); \
} while (0)
#include <sys/module.h>
/*