23 Apr, 2008
2 commits
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Show peer group ID of nearest dominating group that has intersection
with the mount's namespace.Signed-off-by: Miklos Szeredi
Signed-off-by: Al Viro -
Add a unique ID to each peer group using the IDR infrastructure. The
identifiers are reused after the peer group dissolves.The IDR structures are protected by holding namepspace_sem for write
while allocating or deallocating IDs.IDs are allocated when a previously unshared vfsmount becomes the
first member of a peer group. When a new member is added to an
existing group, the ID is copied from one of the old members.IDs are freed when the last member of a peer group is unshared.
Setting the MNT_SHARED flag on members of a subtree is done as a
separate step, after all the IDs have been allocated. This way an
allocation failure can be cleaned up easilty, without affecting the
propagation state.Based on design sketch by Al Viro.
Signed-off-by: Miklos Szeredi
Signed-off-by: Al Viro
22 Apr, 2008
2 commits
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Signed-off-by: Al Viro
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Signed-off-by: Al Viro
28 Mar, 2008
1 commit
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make propagate_mount_busy() exclude references from the vfsmounts
that had been isolated by umount_tree() and are just waiting for
release_mounts() to dispose of their ->mnt_parent/->mnt_mountpoint.Signed-off-by: Al Viro
07 Feb, 2008
1 commit
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Some time ago ( http://lkml.org/lkml/2007/6/19/128 ) I wrote about
MNT_UNBINDABLE that it felt like a bug that it is not reset by "mount
--make-private".Today I happened to see mount(8) and Documentation/sharedsubtree.txt and
both document the version obtained by applying the little patch given in
the above (and again below).So, the present kernel code is not according to specs and must be regarded
as buggy.Specification in Documentation/sharedsubtree.txt:
See state diagram: unbindable should become private upon make-private.Specification in mount(8):
... It's
also possible to set up uni-directional propagation (with --make-
slave), to make a mount point unavailable for --bind/--rbind (with
--make-unbindable), and to undo any of these (with --make-private).Repeat of old fix-shared-subtrees-make-private.patch
(due to Dirk Gerrits, René Gabriëls, Peter Kooijmans):Acked-by: Ram Pai
Cc: Al Viro
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
09 May, 2007
1 commit
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There are many places in the kernel where the construction like
foo = list_entry(head->next, struct foo_struct, list);
are used.
The code might look more descriptive and neat if using the macrolist_first_entry(head, type, member) \
list_entry((head)->next, type, member)Here is the macro itself and the examples of its usage in the generic code.
If it will turn out to be useful, I can prepare the set of patches to
inject in into arch-specific code, drivers, networking, etc.Signed-off-by: Pavel Emelianov
Signed-off-by: Kirill Korotaev
Cc: Randy Dunlap
Cc: Andi Kleen
Cc: Zach Brown
Cc: Davide Libenzi
Cc: John McCutchan
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: john stultz
Cc: Ram Pai
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
09 Dec, 2006
1 commit
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Rename 'struct namespace' to 'struct mnt_namespace' to avoid confusion with
other namespaces being developped for the containers : pid, uts, ipc, etc.
'namespace' variables and attributes are also renamed to 'mnt_ns'Signed-off-by: Kirill Korotaev
Signed-off-by: Cedric Le Goater
Cc: Eric W. Biederman
Cc: Herbert Poetzl
Cc: Sukadev Bhattiprolu
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
27 Jun, 2006
1 commit
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This patch converts the combination of list_del(A) and list_add(A, B) to
list_move(A, B).Cc: Greg Kroah-Hartman
Cc: Ram Pai
Signed-off-by: Akinobu Mita
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
24 Mar, 2006
1 commit
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Signed-off-by: Alexey Dobriyan
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
09 Jan, 2006
1 commit
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Small cleanups in shared mounts code.
Signed-off-by: Miklos Szeredi
Cc: Ram Pai
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
08 Nov, 2005
7 commits
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An unbindable mount does not forward or receive propagation. Also
unbindable mount disallows bind mounts. The semantics is as follows.Bind semantics:
It is invalid to bind mount an unbindable mount.Move semantics:
It is invalid to move an unbindable mount under shared mount.Clone-namespace semantics:
If a mount is unbindable in the parent namespace, the corresponding
cloned mount in the child namespace becomes unbindable too. Note:
there is subtle difference, unbindable mounts cannot be bind mounted
but can be cloned during clone-namespace.Signed-off-by: Ram Pai
Signed-off-by: Al Viro
Signed-off-by: Linus Torvalds -
This makes bind, rbind, move, clone namespace and umount operations
aware of the semantics of slave mount (see Documentation/sharedsubtree.txt
in the last patch of the series for detailed description).Signed-off-by: Ram Pai
Signed-off-by: Al Viro
Signed-off-by: Linus Torvalds -
A slave mount always has a master mount from which it receives
mount/umount events. Unlike shared mount the event propagation does not
flow from the slave mount to the master.Signed-off-by: Ram Pai
Signed-off-by: Al Viro
Signed-off-by: Linus Torvalds -
An unmount of a mount creates a umount event on the parent. If the
parent is a shared mount, it gets propagated to all mounts in the peer
group.Signed-off-by: Ram Pai
Signed-off-by: Al Viro
Signed-off-by: Linus Torvalds -
Implement handling of MS_BIND in presense of shared mounts (see
Documentation/sharedsubtree.txt in the end of patch series for detailed
description).Signed-off-by: Ram Pai
Signed-off-by: Al Viro
Signed-off-by: Linus Torvalds -
This creates shared mounts. A shared mount when bind-mounted to some
mountpoint, propagates mount/umount events to each other. All the
shared mounts that propagate events to each other belong to the same
peer-group.Signed-off-by: Ram Pai
Signed-off-by: Al Viro
Signed-off-by: Linus Torvalds -
A private mount does not forward or receive propagation. This patch
provides user the ability to convert any mount to private.Signed-off-by: Ram Pai
Signed-off-by: Al Viro
Signed-off-by: Linus Torvalds
