Comment 0 for bug 418197

SRU Justification: After examining the ext4 maintainer's 2.6.28-stable tree repository there were a few candidate patches we should consider backporting. These will prevent some cases of Oops', lock contention, file corruption, CPU lockups, memory leaks, and fsck errors.

Impact: https://lists.ubuntu.com/archives/kernel-team/2009-June/006142.html

Fix: Backport the following 7 patches

fb68407b0d9efba962c03f55009c797e22f024bc jbd2: Call journal commit callback without holding j_list_lock
9c1ee184a30394e54165fa4c15923cabd952c106 ext4: Fix sub-block zeroing for writes into preallocated extents
485c26ec70f823f2a9cf45982b724893e53a859e ext4: Fix softlockup caused by illegal i_file_acl value in on-disk inode
a7b19448ddbdc34b2b8fedc048ba154ca798667b ext4: fix typo which causes a memory leak on error path
8d03c7a0c550e7ab24cadcef5e66656bfadec8b9 ext4: fix bogus BUG_ONs in in mballoc code
7ce9d5d1f3c8736511daa413c64985a05b2feee3 ext4: fix ext4_free_inode() vs. ext4_claim_inode() race
8f64b32eb73fbfe9f38c4123121b63ee409278a7 ext4: don't call jbd2_journal_force_commit_nested without journal