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    SubjectRe: [PATCH 0/39] Ocfs2 updates for 2.6.28
    Hi Mark,
    do you see my 2 patches for xattr?
    http://oss.oracle.com/pipermail/ocfs2-devel/2008-September/002839.html
    this is pretty straightforward and I think it can be committed with it.
    http://oss.oracle.com/pipermail/ocfs2-devel/2008-September/002839.html
    this is the new support for empty bucket.

    Regards,
    Tao


    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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