[PATCH 0/8] xfstests: Bunch of new stress tests -v3

[Dmitry Monakhov <dmonakhov@xxxxxxxxxx>]

Changes from v2 ( in request to  Christoph's comments)
 - rearange patch sequance
 - codestyle cleanups
 - give better description
 - add tunable mask for FS_IOC_SETFLAGS test.

LOG:
# Following patches improves fsstress logging
 xfstests: fsstress dump inode info when possible
 xfstests: add different logging option to fsstress
# Following patch makes fsstress more manageable
 xfstests: fsstress should kill children tasks before exit
# Following patches add new tests
 xfstests: add fallocate support to fsstress
 xfstests: fsstress add FS_IOC_{SET,GET}FLAGS operations v2
 xfstests: add fiemap operation to fsstress
# Following testcase may fail on recent kernel in case of ext4
# Some fixes are already available here:
# http://www.spinics.net/lists/linux-ext4/msg27857.html
# http://www.spinics.net/lists/linux-ext4/msg28552.html
 xfstests: add a new test that runs fsstress under ENOSPC conditions

# Following testcase may fail on recent kernel in case of ext3/4 
# Fixes available here:
#  http://patchwork.ozlabs.org/patch/120581/
#  http://patchwork.ozlabs.org/patch/120582/
xfstests: add a new quota test that runs fsstress under ENOSPC conditions

P.S: ext4 still contains bugs caused by ordered_mode=>journal_mode
switch for didicated inode (chattr +j ./afile), so one can temproraly
disable jdata switch test by adding FSSTRESS_AVOID="-M 0xffffbfff"