RFC VFS based Union Mount

Bharata B Rao linux-fsdevel lkml 1 version Apr 17, 2007 In review

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v1 RFC Latest Apr 17, 200715 patches 6 repliesIn review

Patches in v1 No applies recorded yet

#	Subject and files	Size	Replies
1/15	Add union mount documentation`Documentation/union-mounts.txt`	+489 -0	0 replies
2/15	Add a new mount flag (MNT_UNION) for union mount`fs/namespace.c` `include/linux/fs.h` `include/linux/mount.h`	+15 -1	0 replies
3/15	Add the whiteout file type`include/linux/stat.h`	+2 -0	0 replies
4/15	Add config options for union mount`fs/Kconfig` `include/linux/union_debug.h`	+92 -0	0 replies
5/15	Introduce union stack`fs/Makefile` `fs/dcache.c` `fs/union.c` +2 more	+314 -0	2 replies
6/15	Union-mount dentry reference counting`fs/dcache.c` `fs/dnotify.c` `fs/inotify.c` +10 more	+484 ~~-36~~	0 replies
7/15	Union-mount mounting`fs/namespace.c` `fs/union.c` `include/linux/fs.h` +1 more	+173 -7	0 replies
8/15	Union-mount lookup`fs/dcache.c` `fs/namei.c` `fs/namespace.c` +4 more	+761 ~~-11~~	0 replies
9/15	Simple union-mount readdir`fs/aio.c` `fs/file_table.c` `fs/readdir.c` +2 more	+426 -7	0 replies
10/15	In-kernel file copy between union mounted filesystems`fs/namei.c` `fs/union.c` `include/linux/namei.h` +1 more	+445 -1	0 replies
11/15	VFS whiteout handling`fs/inode.c` `fs/namei.c` `fs/readdir.c` +3 more	+605 ~~-12~~	0 replies
12/15	ext2 whiteout support`fs/ext2/dir.c` `fs/ext2/namei.c` `fs/ext2/super.c` +1 more	+33 -1	0 replies
13/15	ext3 whiteout support`fs/ext3/dir.c` `fs/ext3/namei.c` `fs/ext3/super.c` +1 more	+75 -8	0 replies
14/15	tmpfs whiteout support`mm/shmem.c`	+8 -1	0 replies
15/15	Union-mount changes for NFS`fs/nfs/dir.c` `fs/nfs/inode.c` `fs/nfs/unlink.c`	+31 ~~-18~~	0 replies

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Cover letter [RFC][PATCH 0/15] VFS based Union Mount

Hi,

Here is an attempt towards vfs based union mount implementation. Union mount provides the filesytem namespace unification feature. Unlike the traditional mounts which hide the contents of the mount point, the union mount presents the merged view of the mount point and the mounted filesytem.

These patches were originally developed for 2.6.11 by Jan Blunck and lately we have been working together in taking this forward. The current patchset applies against 2.6.21-rc6-mm1.

The code is in a highly experimental stage at the moment and the intention of posting this now is to get some initial feedback about the design and the future directions about how this should be taken forward.

You can find more details about union mount in the documentation included in the patchset.

Kindly review and let us know your comments.

Regards,
Bharata.

Read the cover letter in its thread