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VFS_LOCK_GIANT (9) | Kernel routines | Unix Manual Pages | :man

NAME

VFS_LOCK_GIANT, VFS_UNLOCK_GIANT - "Conditionally lock and unlock Giant around entry into VFS"

CONTENTS

Synopsis
Description
Return Values
See Also
Authors
Bugs

SYNOPSIS


.In sys/param.h
.In sys/vnode.h int VFS_LOCK_GIANT "struct mount *mp" void VFS_UNLOCK_GIANT "int vfslocked"

DESCRIPTION

VFS_LOCK_GIANT will conditionally acquire the Giant lock if the file system referenced by mp is marked as MPSAFE or not, returning a flag indicating whether Giant was set, which may later be passed to VFS_UNLOCK_GIANT. The value of mp will typically be derived from the mount pointer in a vnode on which a VFS operation will be performed.

VFS_UNLOCK_GIANT conditionally releases the Giant lock if the passed vfslocked argument is non-zero. It is expected that the argument will be derived from the return values of
.Vn VFS_LOCK_GIANT or NDHASGIANT(9).

RETURN VALUES

VFS_LOCK_GIANT returns a boolean indicating whether or not Giant was acquired.

SEE ALSO

mutex(9), NDHASGIANT(9), vnode(9)

AUTHORS

BUGS


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