chroot_fs_refs

Name:chroot_fs_refs

Proto:void chroot_fs_refs(const struct path *old_root, const struct path *new_root)

Type:void

Parameter:

Type	Parameter	Name
const struct path *	old_root
const struct path *	new_root

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count = 0

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read_lock( & tasklist_lock)

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Careful: do_each_thread/while_each_thread is a double loop so* 'break' will not work as expected - use goto instead.(g, p)

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Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring* subscriptions and synchronises with wait4(). Also used in procfs. Also* pins the final release of task.io_context. Also protects ->cpuset and* ->cgroup.subsys[]. And ->vfork_done.

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fs = Filesystem information:

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If fs Then

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hits = 0

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spin_lock( & lock)

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write_seqcount_begin( & seq)

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hits += replace_path( & root, old_root, new_root)

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hits += replace_path( & pwd, old_root, new_root)

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write_seqcount_end( & seq)

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When hits-- cycle

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count++

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path_get - get a reference to a path*@path: path to get the reference to* Given a path increment the reference count to the dentry and the vfsmount.

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spin_unlock( & lock)

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read_unlock( & tasklist_lock)

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When count-- cycle

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path_put - put a reference to a path*@path: path to put the reference to* Given a path decrement the reference count to the dentry and the vfsmount.

**Caller**
Name	Describe
SYSCALL_DEFINE2	pivot_root Semantics:* Moves the root file system of the current process to the directory put_old,* makes new_root as the new root file system of the current process, and sets* root/cwd of all processes which had them on the current root to new_root

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