[Ocfs2-devel] [PATCH 0/39] Ocfs2 updates for 2.6.28

[Marcos E. Matsunaga <Marcos.Matsunaga@oracle.com>]

Mark,

I'll be running tests on these patches next week. I'm refreshing my
trees right now and will be building the kernel and hopefully getting it
started tomorrow.

Regards,

Marcos Eduardo Matsunaga

Oracle USA
Linux Engineering

?The statements and opinions expressed here are my own and do not
necessarily represent those of Oracle Corporation.?



Mark Fasheh wrote:
> Hi,
>
> 	The following patches comprise the bulk of Ocfs2 updates for the
> 2.6.28 merge window. They can roughly be broken up into 4 sets which add
> incremental features to Ocfs2. The patches are presented as they come in
> git.
>
>
> EA Support
>
> The largest set adds support for extended attributes in Ocfs2. Extended
> attributes are stored both within the inode block, and externally, when their
> numbers grow. Individual attributes can be arbitrarily sized. Smaller ones
> have their data stored inline. Larger attributes grow out to a btree. In
> theory the btrees have similar limits to inode data. In practice though, the
> VFS limits EA sizes to 64K.
>
> When inode space for attributes run low, new ones are created in an external
> disk block. When the block fills up, external attributes are moved to an
> indexed btree. The btree can store many thousands of attributes, if needed.
>
> The patches leading up to EA support further abstracted portions of the Ocfs2
> btree code. Ultimately, this means we can "add" a btree to any Ocfs2 structure
> by embedding a header, and providing the proper callbacks to manipulate
> certain key fields. The xattr code makes use of this, as will future Ocfs2
> features.
>
> Joel made some further improvements to our 'generic' (for Ocfs2 at least)
> btree support which completed the interface by cleaning things up and
> providing for proper callbacks in a static operations structure. Those patches
> follow the xattr series as they were developed afterwards.
>
>
> JBD2 Support
>
> Ocfs2 can now use JBD2. Amongst other benefits, this allows us to support
> large block devices with more than 32 bits worth of block numbers. As a part
> of these patches, and 'inode64' mount option is added which toggles creation
> of inodes whose inode number requires more than 32 bits to be adequately
> described.
>
> JBD2 support in Ocfs2 is compiled in by default, however since journaling is
> so central to the operation of a file system, we kept our 'legacy' JBD
> support. We did this to provide a fallback for any users who might hit a
> problem, while we fix it. Legacy JBD support will be removed from Ocfs2 in
> 2.6.29.
>
>
> Cluster Aware POSIX File Locks
>
> This was added via the 'plock' interface which Dave Teigland pulled into
> fs/dlm last merge window. The majority of the support is actually provided in
> userspace via the dlm_controld. As a result, cluster-aware POSIX locks only
> work for userspace cluster stacks right now.
>
>
> Local Alloc Throttling
>
> These patches allow the "local alloc" file in Ocfs2 to throttle back the
> number of free disk blocks it caches. This is done during times of extreme
> fragmentation, or very low disk space. The traditional behavior was to
> completely disable the local alloc feature, which resulted in performance
> problems on some corner cases. The throttling has increased performance by 10
> times during such situations.
>
>
> Please pull from 'merge_window' branch of
> git://git.kernel.org/pub/scm/linux/kernel/git/mfasheh/ocfs2.git merge_window
>
> to receive the following updates:
>
>  Documentation/filesystems/ocfs2.txt |    4 +
>  fs/Kconfig                          |   40 +-
>  fs/ocfs2/Makefile                   |    5 +-
>  fs/ocfs2/alloc.c                    |  857 +++++--
>  fs/ocfs2/alloc.h                    |   86 +-
>  fs/ocfs2/aops.c                     |   49 +-
>  fs/ocfs2/cluster/masklog.c          |    1 +
>  fs/ocfs2/cluster/masklog.h          |    1 +
>  fs/ocfs2/dir.c                      |   26 +-
>  fs/ocfs2/extent_map.c               |   60 +
>  fs/ocfs2/extent_map.h               |    3 +
>  fs/ocfs2/file.c                     |  313 +--
>  fs/ocfs2/file.h                     |   32 +-
>  fs/ocfs2/inode.c                    |   28 +-
>  fs/ocfs2/inode.h                    |    4 +
>  fs/ocfs2/journal.c                  |   72 +-
>  fs/ocfs2/journal.h                  |   52 +-
>  fs/ocfs2/localalloc.c               |  362 +++-
>  fs/ocfs2/localalloc.h               |    4 +
>  fs/ocfs2/locks.c                    |   15 +
>  fs/ocfs2/locks.h                    |    1 +
>  fs/ocfs2/namei.c                    |   13 +-
>  fs/ocfs2/ocfs2.h                    |   56 +-
>  fs/ocfs2/ocfs2_fs.h                 |  220 ++-
>  fs/ocfs2/ocfs2_jbd_compat.h         |   82 +
>  fs/ocfs2/stack_user.c               |   33 +
>  fs/ocfs2/stackglue.c                |   20 +
>  fs/ocfs2/stackglue.h                |   19 +
>  fs/ocfs2/suballoc.c                 |  205 ++-
>  fs/ocfs2/suballoc.h                 |   26 +-
>  fs/ocfs2/super.c                    |   59 +-
>  fs/ocfs2/symlink.c                  |    9 +
>  fs/ocfs2/uptodate.c                 |   38 +-
>  fs/ocfs2/uptodate.h                 |    3 +
>  fs/ocfs2/xattr.c                    | 4851 +++++++++++++++++++++++++++++++++++
>  fs/ocfs2/xattr.h                    |   68 +
>  fs/ocfs2/xattr_trusted.c            |   82 +
>  fs/ocfs2/xattr_user.c               |   94 +
>  38 files changed, 7271 insertions(+), 622 deletions(-)
>  create mode 100644 fs/ocfs2/ocfs2_jbd_compat.h
>  create mode 100644 fs/ocfs2/xattr.c
>  create mode 100644 fs/ocfs2/xattr.h
>  create mode 100644 fs/ocfs2/xattr_trusted.c
>  create mode 100644 fs/ocfs2/xattr_user.c
>
> Joel Becker (15):
>       ocfs2: Prefix the extent tree operations structure.
>       ocfs2: Prefix the ocfs2_extent_tree structure.
>       ocfs2: Make ocfs2_extent_tree get/put instead of alloc.
>       ocfs2: Make 'private' into 'object' on ocfs2_extent_tree.
>       ocfs2: Provide the get_root_el() method to ocfs2_extent_tree_operations.
>       ocfs2: Use struct ocfs2_extent_tree in ocfs2_num_free_extents().
>       ocfs2: Determine an extent tree's max_leaf_clusters in an et_op.
>       ocfs2: Create specific get_extent_tree functions.
>       ocfs2: Add an insertion check to ocfs2_extent_tree_operations.
>       ocfs2: Make ocfs2_extent_tree the first-class representation of a tree.
>       ocfs2: Comment struct ocfs2_extent_tree_operations.
>       ocfs2: Change ocfs2_get_*_extent_tree() to ocfs2_init_*_extent_tree()
>       ocfs2: Limit inode allocation to 32bits.
>       ocfs2: Add the 'inode64' mount option.
>       ocfs2: Switch over to JBD2.
>
> Mark Fasheh (5):
>       ocfs2: POSIX file locks support
>       ocfs2: Track local alloc bits internally
>       ocfs2: throttle back local alloc when low on disk space
>       ocfs2: track local alloc state via debugfs
>       ocfs2: fix printk format warnings
>
> Sunil Mushran (1):
>       ocfs2: Add xattr mount option in ocfs2_show_options()
>
> Tao Ma (15):
>       ocfs2: Modify ocfs2_num_free_extents for future xattr usage.
>       ocfs2: Use ocfs2_extent_list instead of ocfs2_dinode.
>       ocfs2: Abstract ocfs2_extent_tree in b-tree operations.
>       ocfs2: Make high level btree extend code generic
>       ocfs2: Add the basic xattr disk layout in ocfs2_fs.h
>       ocfs2: Add helper function in uptodate.c for removing xattr clusters
>       ocfs2: Add extent tree operation for xattr value btrees
>       ocfs2: Add xattr index tree operations
>       ocfs2: Add xattr bucket iteration for large numbers of EAs
>       ocfs2: Add xattr lookup code xattr btrees
>       ocfs2: Optionally limit extent size in ocfs2_insert_extent()
>       ocfs2: Enable xattr set in index btree
>       ocfs2: Delete all xattr buckets during inode removal
>       ocfs2: bug-fix for journal extend in xattr.
>       ocfs2: Resolve deadlock in ocfs2_xattr_free_block.
>
> Tiger Yang (3):
>       ocfs2: reserve inline space for extended attribute
>       ocfs2: Add extended attribute support
>       ocfs2: Add incompatible flag for extended attribute
>
>
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