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Comment: Add link to Signed-off-by page.

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LU-nnn component: short description of change under 62 columns

The "component:" should be a lower-case single-word subsystem of the
Lustre code that best encompasses the change being made.  Examples of
components include modules: llite, lov, lmv, osc, mdc, ldlm, lnet,
ptlrpc, mds, oss, osd-ldiskfs, ldiskfs, libcfs, socklnd, o2iblnd;
functional subsystems: recovery, quota, grant; and auxilliary areas:
build, tests, docs.  This list is not exhaustive, but is a guideline.

The commit comment should contain a detailed explanation of changes
being made.  This can be as long as you'd like.  Please give details
of what problem was solved (including error messages or problems that
were seen), a good high-level description of how it was solved, and
which parts of the code were changed (including important functions
that were changed, if this is useful to understand the patch, and
for easier searching).  Wrap lines at/under 70 columns.

Signed-off-by: Your Real Name <your_email@domain.name>
Change-Id: Ixxxx(added automatically if missing)xxxx

The Signed-off-by: line

The Signed-off-by: line asserts that you have permission to contribute the code to the project according to the Developer's Certificate of Origin.

The Change-Id: line and Code Style

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LU-477 ldiskfs: allocate s_group_desc/s_group_info by vmalloc()

Add the patch to the RHEL6 ldiskfs patch series.

Large kmalloc() for sbi->s_group_desc and sbi->s_group_info can fail
for large filesystems (typically over 16TB), which will cause the
"not enough memory" error while mounting.  This patch makes allocation
fall back to vmalloc() if the kmalloc() failed, as what was done for
sbi->s_flex_groups.

To avoid colliding with an valid on-disk inode number, EXT4_BAD_INO
is used as the number of the buddy cache inode.

The patch also incorporates the following upstream kernel fix:

  commit 32a9bb57d7c1fd04ae0f72b8f671501f000a0e9f
  ext4: fix missing iput() of root inode for some mount error paths
  https://bugzilla.kernel.org/show_bug.cgi?id=26752

Signed-off-by: Yu Jian <yujian whamcloud<yujian@whamcloud.com>
Change-Id: I3950425835ea7f2968ceb2edbc622e3ff3ed8545

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LU-4725 mdt: child-parent lock ordering in rename
    
Change rename so that it always has parent-child lock ordering,
otherwise it may deadlock with other operations.
    
Lustre-commit: 4e308ef74f271ec7e19917e3c0f88586537582c3
Lustre-change: http://review.whamcloud.com/9538
    
LU-4725 obd: lu_object_find_at hung
    
lu_object_find_at hangs if called two times and object is removed
in between. It makes mdt_rename_sanity not workable for rename.
Change mdt_rename_sanity to work on existing object.
    
Lustre-commit: b7c72ec1ddeda2cf94ea151f974d3f94e3a7d1ed
Lustre-change: http://review.whamcloud.com/10484
Xyratex-bug-id: MRP-1700
    
Test-Parameters: alwaysuploadlogs \
  envdefinitions=SLOW=yes,ENABLE_QUOTA=yes,ONLY=54 \
  ossjob=lustre-b2_4 mdsjob=lustre-b2_4 ossbuildno=73 mdsbuildno=73 \
  testlist=sanityn
    
Signed-off-by: Vitaly Fertman <vitaly_fertman@xyratex.com>
Signed-off-by: Rahul Deshmukh <rahul_deshmukh@xyratex.com>    
Change-Id: Ic9ce52bfcd8788834347fba155cc8c6be674dcd8

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