)]}'
{
  "log": [
    {
      "commit": "3889fd57ea3c58209354862523275774fca9db03",
      "tree": "1e68fb9b2691c0b792a36be7d87c987e8508dac6",
      "parents": [
        "b40971426a837e9dc9c66e1b6bbcb3874eafe4e0"
      ],
      "author": {
        "name": "Jiaying Zhang",
        "email": "jiayingz@google.com",
        "time": "Mon Jan 10 12:47:05 2011 -0500"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Mon Jan 10 12:47:05 2011 -0500"
      },
      "message": "ext4: flush the i_completed_io_list during ext4_truncate\n\nTed first found the bug when running 2.6.36 kernel with dioread_nolock\nmount option that xfstests #13 complained about wrong file size during fsck.\nHowever, the bug exists in the older kernels as well although it is\nsomehow harder to trigger.\n\nThe problem is that ext4_end_io_work() can happen after we have truncated an\ninode to a smaller size. Then when ext4_end_io_work() calls \next4_convert_unwritten_extents(), we may reallocate some blocks that have \nbeen truncated, so the inode size becomes inconsistent with the allocated\nblocks. \n\nThe following patch flushes the i_completed_io_list during truncate to reduce \nthe risk that some pending end_io requests are executed later and convert \nalready truncated blocks to initialized. \n\nNote that although the fix helps reduce the problem a lot there may still \nbe a race window between vmtruncate() and ext4_end_io_work(). The fundamental\nproblem is that if vmtruncate() is called without either i_mutex or i_alloc_sem\nheld, it can race with an ongoing write request so that the io_end request is\nprocessed later when the corresponding blocks have been truncated.\n\nTed and I have discussed the problem offline and we saw a few ways to fix\nthe race completely:\n\na) We guarantee that i_mutex lock and i_alloc_sem write lock are both hold \nwhenever vmtruncate() is called. The i_mutex lock prevents any new write\nrequests from entering writeback and the i_alloc_sem prevents the race\nfrom ext4_page_mkwrite(). Currently we hold both locks if vmtruncate()\nis called from do_truncate(), which is probably the most common case.\nHowever, there are places where we may call vmtruncate() without holding\neither i_mutex or i_alloc_sem. I would like to ask for other people\u0027s\nopinions on what locks are expected to be held before calling vmtruncate().\nThere seems a disagreement among the callers of that function.\n\nb) We change the ext4 write path so that we change the extent tree to contain \nthe newly allocated blocks and update i_size both at the same time --- when \nthe write of the data blocks is completed.\n\nc) We add some additional locking to synchronize vmtruncate() and \next4_end_io_work(). This approach may have performance implications so we\nneed to be careful.\n\nAll of the above proposals may require more substantial changes, so\nwe may consider to take the following patch as a bandaid.\n\nSigned-off-by: Jiaying Zhang \u003cjiayingz@google.com\u003e\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n\n"
    },
    {
      "commit": "a107e5a3a473a2ea62bd5af24e11b84adf1486ff",
      "tree": "d36c2cb38d8be88d4d75cdebc354aa140aa0e470",
      "parents": [
        "e3e1288e86a07cdeb0aee5860a2dff111c6eff79",
        "a269029d0e2192046be4c07ed78a45022469ee4c"
      ],
      "author": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Wed Oct 27 23:44:47 2010 -0400"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Wed Oct 27 23:44:47 2010 -0400"
      },
      "message": "Merge branch \u0027next\u0027 into upstream-merge\n\nConflicts:\n\tfs/ext4/inode.c\n\tfs/ext4/mballoc.c\n\tinclude/trace/events/ext4.h\n"
    },
    {
      "commit": "4a873a472b3bbcfd425d7ae210afdec28c04e2e5",
      "tree": "88aa333bfafcc5303b7a3074865f51f67ad836b9",
      "parents": [
        "bf89d16f6ef5389f1b9d8046e838ec87b9b3f8b9"
      ],
      "author": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Wed Oct 27 21:30:14 2010 -0400"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Wed Oct 27 21:30:14 2010 -0400"
      },
      "message": "ext4: move flush_completed_IO to fs/ext4/fsync.c and make it static\n\nFix a namespace leak by moving the function to the file where it is\nused and making it static.\n\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n"
    },
    {
      "commit": "dd3932eddf428571762596e17b65f5dc92ca361b",
      "tree": "57cec5ae2f862037f78b7e993323d77955bb6463",
      "parents": [
        "8786fb70ccb36c7cff64680bb80c46d3a09d44db"
      ],
      "author": {
        "name": "Christoph Hellwig",
        "email": "hch@lst.de",
        "time": "Thu Sep 16 20:51:46 2010 +0200"
      },
      "committer": {
        "name": "Jens Axboe",
        "email": "jaxboe@fusionio.com",
        "time": "Thu Sep 16 20:52:58 2010 +0200"
      },
      "message": "block: remove BLKDEV_IFL_WAIT\n\nAll the blkdev_issue_* helpers can only sanely be used for synchronous\ncaller.  To issue cache flushes or barriers asynchronously the caller needs\nto set up a bio by itself with a completion callback to move the asynchronous\nstate machine ahead.  So drop the BLKDEV_IFL_WAIT flag that is always\nspecified when calling blkdev_issue_* and also remove the now unused flags\nargument to blkdev_issue_flush and blkdev_issue_zeroout.  For\nblkdev_issue_discard we need to keep it for the secure discard flag, which\ngains a more descriptive name and loses the bitops vs flag confusion.\n\nSigned-off-by: Christoph Hellwig \u003chch@lst.de\u003e\nSigned-off-by: Jens Axboe \u003cjaxboe@fusionio.com\u003e\n"
    },
    {
      "commit": "1b061d9247f71cd15edc4c4c4600191a903642c0",
      "tree": "30d92ca82d8286e7a45fba108230ecd23e61673b",
      "parents": [
        "7ea8085910ef3dd4f3cad6845aaa2b580d39b115"
      ],
      "author": {
        "name": "Christoph Hellwig",
        "email": "hch@lst.de",
        "time": "Wed May 26 17:53:41 2010 +0200"
      },
      "committer": {
        "name": "Al Viro",
        "email": "viro@zeniv.linux.org.uk",
        "time": "Thu May 27 22:06:06 2010 -0400"
      },
      "message": "rename the generic fsync implementations\n\nWe don\u0027t name our generic fsync implementations very well currently.\nThe no-op implementation for in-memory filesystems currently is called\nsimple_sync_file which doesn\u0027t make too much sense to start with,\nthe the generic one for simple filesystems is called simple_fsync\nwhich can lead to some confusion.\n\nThis patch renames the generic file fsync method to generic_file_fsync\nto match the other generic_file_* routines it is supposed to be used\nwith, and the no-op implementation to noop_fsync to make it obvious\nwhat to expect.  In addition add some documentation for both methods.\n\nSigned-off-by: Christoph Hellwig \u003chch@lst.de\u003e\nSigned-off-by: Al Viro \u003cviro@zeniv.linux.org.uk\u003e\n"
    },
    {
      "commit": "7ea8085910ef3dd4f3cad6845aaa2b580d39b115",
      "tree": "d9c1edb5906f943f7d70bfb4b65106e29772d379",
      "parents": [
        "cc967be54710d97c05229b2e5ba2d00df84ddd64"
      ],
      "author": {
        "name": "Christoph Hellwig",
        "email": "hch@lst.de",
        "time": "Wed May 26 17:53:25 2010 +0200"
      },
      "committer": {
        "name": "Al Viro",
        "email": "viro@zeniv.linux.org.uk",
        "time": "Thu May 27 22:05:02 2010 -0400"
      },
      "message": "drop unused dentry argument to -\u003efsync\n\nSigned-off-by: Christoph Hellwig \u003chch@lst.de\u003e\nSigned-off-by: Al Viro \u003cviro@zeniv.linux.org.uk\u003e\n"
    },
    {
      "commit": "e4ce30f3779c2ddaa7dfaa4042209e5dbacbada5",
      "tree": "cc64c1dcd16b5dbf71ebc8338b339e6fb04abaee",
      "parents": [
        "b899ebeb05da4287ce845976727e3e83dadd25d5",
        "14ece1028b3ed53ffec1b1213ffc6acaf79ad77c"
      ],
      "author": {
        "name": "Linus Torvalds",
        "email": "torvalds@linux-foundation.org",
        "time": "Thu May 27 10:26:37 2010 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@linux-foundation.org",
        "time": "Thu May 27 10:26:37 2010 -0700"
      },
      "message": "Merge branch \u0027for_linus\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4\n\n* \u0027for_linus\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (40 commits)\n  ext4: Make fsync sync new parent directories in no-journal mode\n  ext4: Drop whitespace at end of lines\n  ext4: Fix compat EXT4_IOC_ADD_GROUP\n  ext4: Conditionally define compat ioctl numbers\n  tracing: Convert more ext4 events to DEFINE_EVENT\n  ext4: Add new tracepoints to track mballoc\u0027s buddy bitmap loads\n  ext4: Add a missing trace hook\n  ext4: restart ext4_ext_remove_space() after transaction restart\n  ext4: Clear the EXT4_EOFBLOCKS_FL flag only when warranted\n  ext4: Avoid crashing on NULL ptr dereference on a filesystem error\n  ext4: Use bitops to read/modify i_flags in struct ext4_inode_info\n  ext4: Convert calls of ext4_error() to EXT4_ERROR_INODE()\n  ext4: Convert callers of ext4_get_blocks() to use ext4_map_blocks()\n  ext4: Add new abstraction ext4_map_blocks() underneath ext4_get_blocks()\n  ext4: Use our own write_cache_pages()\n  ext4: Show journal_checksum option\n  ext4: Fix for ext4_mb_collect_stats()\n  ext4: check for a good block group before loading buddy pages\n  ext4: Prevent creation of files larger than RLIMIT_FSIZE using fallocate\n  ext4: Remove extraneous newlines in ext4_msg() calls\n  ...\n\nFixed up trivial conflict in fs/ext4/fsync.c\n"
    },
    {
      "commit": "14ece1028b3ed53ffec1b1213ffc6acaf79ad77c",
      "tree": "8f5a13487139c68ef775c9d39b7be83386fdae06",
      "parents": [
        "60e6679e28518ccd67169c4a539d8cc7490eb8a6"
      ],
      "author": {
        "name": "Frank Mayhar",
        "email": "fmayhar@google.com",
        "time": "Mon May 17 08:00:00 2010 -0400"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Mon May 17 08:00:00 2010 -0400"
      },
      "message": "ext4: Make fsync sync new parent directories in no-journal mode\n\nAdd a new ext4 state to tell us when a file has been newly created; use\nthat state in ext4_sync_file in no-journal mode to tell us when we need\nto sync the parent directory as well as the inode and data itself.  This\nfixes a problem in which a panic or power failure may lose the entire\nfile even when using fsync, since the parent directory entry is lost.\n\nAddresses-Google-Bug: #2480057\n\nSigned-off-by: Frank Mayhar \u003cfmayhar@google.com\u003e\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n"
    },
    {
      "commit": "60e6679e28518ccd67169c4a539d8cc7490eb8a6",
      "tree": "65f39d1e9da3006df5bc5532d0c8a7ec365599f0",
      "parents": [
        "4d92dc0f00a775dc2e1267b0e00befb783902fe7"
      ],
      "author": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Mon May 17 07:00:00 2010 -0400"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Mon May 17 07:00:00 2010 -0400"
      },
      "message": "ext4: Drop whitespace at end of lines\n\nThis patch was generated using:\n\n#!/usr/bin/perl -i\nwhile (\u003c\u003e) {\n    s/[ \t]+$//;\n    print;\n}\n\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n"
    },
    {
      "commit": "0671e704658b9f26f85e78d51176daa861f955c7",
      "tree": "412b4ec94b565eabaab74312c5b7fd04341a6d4f",
      "parents": [
        "b57f95a38233a2e73b679bea4a5453a1cc2a1cc9"
      ],
      "author": {
        "name": "Dmitry Monakhov",
        "email": "dmonakhov@openvz.org",
        "time": "Mon May 10 00:00:00 2010 -0400"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Mon May 10 00:00:00 2010 -0400"
      },
      "message": "ext4: check missed return value in ext4_sync_file()\n\nSigned-off-by: Dmitry Monakhov \u003cdmonakhov@openvz.org\u003e\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n"
    },
    {
      "commit": "fbd9b09a177a481eda256447c881f014f29034fe",
      "tree": "ef7e213045382f82a1e3e3cf134d196a1045dd7a",
      "parents": [
        "6b4517a7913a09d3259bb1d21c9cb300f12294bd"
      ],
      "author": {
        "name": "Dmitry Monakhov",
        "email": "dmonakhov@openvz.org",
        "time": "Wed Apr 28 17:55:06 2010 +0400"
      },
      "committer": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Wed Apr 28 19:47:36 2010 +0200"
      },
      "message": "blkdev: generalize flags for blkdev_issue_fn functions\n\nThe patch just convert all blkdev_issue_xxx function to common\nset of flags. Wait/allocation semantics preserved.\n\nSigned-off-by: Dmitry Monakhov \u003cdmonakhov@openvz.org\u003e\nSigned-off-by: Jens Axboe \u003cjens.axboe@oracle.com\u003e\n"
    },
    {
      "commit": "c7064ef13b2181a489836349f9baf87df0dab28f",
      "tree": "433d86d9ed4285e5c5e7f24fbbaa7f48fad09381",
      "parents": [
        "b8b8afe236e97b6359d46d3a3f8c46455e192271"
      ],
      "author": {
        "name": "Jiaying Zhang",
        "email": "jiayingz@google.com",
        "time": "Tue Mar 02 13:28:44 2010 -0500"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Tue Mar 02 13:28:44 2010 -0500"
      },
      "message": "ext4: mechanical rename some of the direct I/O get_block\u0027s identifiers\n\nThis commit renames some of the direct I/O\u0027s block allocation flags,\nvariables, and functions introduced in Mingming\u0027s \"Direct IO for holes\nand fallocate\" patches so that they can be used by ext4\u0027s buffered\nwrite path as well.  Also changed the related function comments\naccordingly to cover both direct write and buffered write cases.\n\nSigned-off-by: Jiaying Zhang \u003cjiayingz@google.com\u003e\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n"
    },
    {
      "commit": "cc3e1bea5d87635c519da657303690f5538bb4eb",
      "tree": "727b348d0389a2fe6618fb224fe1d81d207668c4",
      "parents": [
        "034fb4c95fc0fed4ec4a50778127b92c6f2aec01"
      ],
      "author": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Wed Dec 23 06:52:08 2009 -0500"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Wed Dec 23 06:52:08 2009 -0500"
      },
      "message": "ext4, jbd2: Add barriers for file systems with exernal journals\n\nThis is a bit complicated because we are trying to optimize when we\nsend barriers to the fs data disk.  We could just throw in an extra\nbarrier to the data disk whenever we send a barrier to the journal\ndisk, but that\u0027s not always strictly necessary.\n\nWe only need to send a barrier during a commit when there are data\nblocks which are must be written out due to an inode written in\nordered mode, or if fsync() depends on the commit to force data blocks\nto disk.  Finally, before we drop transactions from the beginning of\nthe journal during a checkpoint operation, we need to guarantee that\nany blocks that were flushed out to the data disk are firmly on the\nrust platter before we drop the transaction from the journal.\n\nThanks to Oleg Drokin for pointing out this flaw in ext3/ext4.\n\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n\n"
    },
    {
      "commit": "b436b9bef84de6893e86346d8fbf7104bc520645",
      "tree": "50fb9ae167bcd622e9adf47646bcf3b4c7dd111d",
      "parents": [
        "194074acacebc169ded90a4657193f5180015051"
      ],
      "author": {
        "name": "Jan Kara",
        "email": "jack@suse.cz",
        "time": "Tue Dec 08 23:51:10 2009 -0500"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Tue Dec 08 23:51:10 2009 -0500"
      },
      "message": "ext4: Wait for proper transaction commit on fsync\n\nWe cannot rely on buffer dirty bits during fsync because pdflush can come\nbefore fsync is called and clear dirty bits without forcing a transaction\ncommit. What we do is that we track which transaction has last changed\nthe inode and which transaction last changed allocation and force it to\ndisk on fsync.\n\nSigned-off-by: Jan Kara \u003cjack@suse.cz\u003e\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n"
    },
    {
      "commit": "6b17d902fdd241adfa4ce780df20547b28bf5801",
      "tree": "a5daca03108c565c58347d36b1dec70cf22ef1d1",
      "parents": [
        "1032988c71f3f85483b2b4319684d1205a704c02"
      ],
      "author": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Mon Nov 23 07:24:57 2009 -0500"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Mon Nov 23 07:24:57 2009 -0500"
      },
      "message": "ext4: avoid issuing unnecessary barriers\n\nWe don\u0027t to issue an I/O barrier on an error or if we force commit\nbecause we are doing data journaling.\n\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\nCc: Jan Kara \u003cjack@suse.cz\u003e\nCc: stable@kernel.org\n"
    },
    {
      "commit": "8d5d02e6b176565c77ff03604908b1453a22044d",
      "tree": "0d29e4f28233f24960c7921c1c0a7608077bf713",
      "parents": [
        "4c0425ff68b1b87b802ffeda7b6a46ff7da7241c"
      ],
      "author": {
        "name": "Mingming Cao",
        "email": "cmm@us.ibm.com",
        "time": "Mon Sep 28 15:48:29 2009 -0400"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Mon Sep 28 15:48:29 2009 -0400"
      },
      "message": "ext4: async direct IO for holes and fallocate support\n\nFor async direct IO that covers holes or fallocate, the end_io\ncallback function now queued the convertion work on workqueue but\ndon\u0027t flush the work rightaway as it might take too long to afford.\n\nBut when fsync is called after all the data is completed, user expects\nthe metadata also being updated before fsync returns.\n\nThus we need to flush the conversion work when fsync() is called.\nThis patch keep track of a listed of completed async direct io that\nhas a work queued on workqueue.  When fsync() is called, it will go\nthrough the list and do the conversion.\n\nSigned-off-by: Mingming Cao \u003ccmm@us.ibm.com\u003e\n"
    },
    {
      "commit": "fe188c0e084bdf3038dc0ac963c21d764f53f7da",
      "tree": "bb712f58f4c0356058825da75da57d0af450e01b",
      "parents": [
        "c7acb4c16646943180bd221c167a077e0a084f9c"
      ],
      "author": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Sat Sep 12 13:41:55 2009 -0400"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Sat Sep 12 13:41:55 2009 -0400"
      },
      "message": "ext4: Assure that metadata blocks are written during fsync in no journal mode\n\nWhen there is no journal present, we must attach buffer heads\nassociated with extent tree and indirect blocks to the inode\u0027s\nmapping-\u003eprivate_list via mark_buffer_dirty_inode() so that\next4_sync_file() --- which is called to service fsync() and\nfdatasync() system calls --- can write out the inode\u0027s metadata blocks\nby calling sync_mapping_buffers().\n\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n"
    },
    {
      "commit": "5f3481e9a80c240f169b36ea886e2325b9aeb745",
      "tree": "435a8cf2be9c81a545f42d5af881450f8d121e74",
      "parents": [
        "d0646f7b636d067d715fab52a2ba9c6f0f46b0d7"
      ],
      "author": {
        "name": "Christoph Hellwig",
        "email": "hch@lst.de",
        "time": "Sat Sep 05 21:42:42 2009 -0400"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Sat Sep 05 21:42:42 2009 -0400"
      },
      "message": "ext4: fix cache flush in ext4_sync_file\n\nWe need to flush the write cache unconditionally in -\u003efsync, otherwise\nwrites into already allocated blocks can get lost.  Writes into fully\nallocated files are very common when using disk images for\nvirtualization, and without this fix can easily lose data after\nan fdatasync, which is the typical implementation for a cache flush on\nthe virtual drive.\n\nSigned-off-by: Christoph Hellwig \u003chch@lst.de\u003e\nAcked-by: Eric Sandeen \u003csandeen@redhat.com\u003e\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n"
    },
    {
      "commit": "9bffad1ed2a003a355ed1b42424a0ae3575275ed",
      "tree": "9016e7b0e04a0e5319680f9e1f89fc1abb13c765",
      "parents": [
        "879c5e6b7cb4c689d08ca9b2e353d8ab3dc425d5"
      ],
      "author": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Wed Jun 17 11:48:11 2009 -0400"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Wed Jun 17 11:48:11 2009 -0400"
      },
      "message": "ext4: convert instrumentation from markers to tracepoints\n\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n"
    },
    {
      "commit": "ede86cc473defab74d778aeac14b19f43129d4d1",
      "tree": "19da8009accf1737171f5949413e46a9086d5fdc",
      "parents": [
        "23f8b79eae8a74e42a006ffa7c456e295c7e1c0d"
      ],
      "author": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Sun Oct 05 20:50:06 2008 -0400"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Sun Oct 05 20:50:06 2008 -0400"
      },
      "message": "ext4: Add debugging markers that can be used by systemtap\n\nThis debugging markers are designed to debug problems such as the\nrandom filesystem latency problems reported by Arjan.\n\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n"
    },
    {
      "commit": "af5bc92dded4d98dfeabc8b5b9812571345b263d",
      "tree": "5cfaf27e673a09d3ad1341c175559be0a3ea990d",
      "parents": [
        "e5f8eab8851dff162e7ade46f084cb8575dc45f7"
      ],
      "author": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Mon Sep 08 22:25:24 2008 -0400"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Mon Sep 08 22:25:24 2008 -0400"
      },
      "message": "ext4: Fix whitespace checkpatch warnings/errors\n\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n\n"
    },
    {
      "commit": "d755fb384250d6bd7fd18a0930e71965acc8e72e",
      "tree": "7913bce90918cd26c8a5fe05f6c8943828e333bb",
      "parents": [
        "654b4908bc17a6318d18f3036fecc5155de92f55"
      ],
      "author": {
        "name": "Eric Sandeen",
        "email": "sandeen@redhat.com",
        "time": "Fri Jul 11 19:27:31 2008 -0400"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Fri Jul 11 19:27:31 2008 -0400"
      },
      "message": "ext4: call blkdev_issue_flush on fsync\n\nTo ensure that bits are truly on-disk after an fsync,\nwe should call blkdev_issue_flush if barriers are supported.\n\nInspired by an old thread on barriers, by reiserfs \u0026 xfs\nwhich do the same, and by a patch SuSE ships with their kernel\n\nSigned-off-by: Eric Sandeen \u003csandeen@redhat.com\u003e\nSigned-off-by: Mingming Cao \u003ccmm@us.ibm.com\u003e\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n"
    },
    {
      "commit": "3dcf54515aa4981a647ad74859199032965193a5",
      "tree": "b95d895bb2f6fa15be29411b15d538c21b0de930",
      "parents": [
        "216553c4b7f3e3e2beb4981cddca9b2027523928"
      ],
      "author": {
        "name": "Christoph Hellwig",
        "email": "hch@lst.de",
        "time": "Tue Apr 29 18:13:32 2008 -0400"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Tue Apr 29 18:13:32 2008 -0400"
      },
      "message": "ext4: move headers out of include/linux\n\nMove ext4 headers out of include/linux.  This is just the trivial move,\nthere\u0027s some more thing that could be done later. \n\nSigned-off-by: Christoph Hellwig \u003chch@lst.de\u003e\nSigned-off-by: Mingming Cao \u003ccmm@us.ibm.com\u003e\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n\n"
    },
    {
      "commit": "53c550e9750434ddc4275fe0405170e0d1b46731",
      "tree": "e810f7e68b54f41c8ab5d5dad9b1c7dd8068c61a",
      "parents": [
        "97bd42b9c8be748ad85b362ba3bd401f4d35be80"
      ],
      "author": {
        "name": "Hisashi Hifumi",
        "email": "hifumi.hisashi@oss.ntt.co.jp",
        "time": "Thu Apr 17 10:38:59 2008 -0400"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Thu Apr 17 10:38:59 2008 -0400"
      },
      "message": "ext4: fdatasync should skip metadata writeout when overwriting\n\nCurrently fdatasync is identical to fsync in ext3.\n\nI think fdatasync should skip journal flush in data\u003dordered and\ndata\u003dwriteback mode when it overwrites to already-instantiated blocks on\nHDD.  When I_DIRTY_DATASYNC flag is not set, fdatasync should skip journal\nwriteout because this indicates only atime or/and mtime updates.\n\nFollowing patch is the same approach of ext2\u0027s fsync code(ext2_sync_file).\n\nI did a performance test using the sysbench.\n\n#sysbench --num-threads\u003d128 --max-requests\u003d50000 --test\u003dfileio --file-total-size\u003d128G\n--file-test-mode\u003drndwr --file-fsync-mode\u003dfdatasync run\n\nThe result on ext3 was:\n\n\t-2.6.24\n\tOperations performed:  0 Read, 50080 Write, 59600 Other \u003d 109680 Total\n\tRead 0b  Written 782.5Mb  Total transferred 782.5Mb  (12.116Mb/sec)\n\t  775.45 Requests/sec executed\n\n\tTest execution summary:\n\t    total time:                          64.5814s\n\t    total number of events:              50080\n\t    total time taken by event execution: 3713.9836\n\t    per-request statistics:\n\t         min:                            0.0000s\n\t         avg:                            0.0742s\n\t         max:                            0.9375s\n\t         approx.  95 percentile:         0.2901s\n\n\tThreads fairness:\n\t    events (avg/stddev):           391.2500/23.26\n\t    execution time (avg/stddev):   29.0155/1.99\n\n\t-2.6.24-patched\n\tOperations performed:  0 Read, 50009 Write, 61596 Other \u003d 111605 Total\n\tRead 0b  Written 781.39Mb  Total transferred 781.39Mb  (16.419Mb/sec)\n\t1050.83 Requests/sec executed\n\n\tTest execution summary:\n\t    total time:                          47.5900s\n\t    total number of events:              50009\n\t    total time taken by event execution: 2934.5768\n\t    per-request statistics:\n \t         min:                            0.0000s\n\t         avg:                            0.0587s\n \t         max:                            0.8938s\n\t         approx.  95 percentile:         0.1993s\n\n\tThreads fairness:\n\t    events (avg/stddev):           390.6953/22.64\n\t    execution time (avg/stddev):   22.9264/1.17\n\nFilesystem I/O throughput was improved.\n\nSigned-off-by :Hisashi Hifumi \u003chifumi.hisashi@oss.ntt.co.jp\u003e\nAcked-by: Jan Kara \u003cjack@suse.cz\u003e\nCc: \u003clinux-ext4@vger.kernel.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: \"Theodore Ts\u0027o\" \u003ctytso@mit.edu\u003e\n\n"
    },
    {
      "commit": "ac39849ddc19c0bbb39068497139ac45bccd4321",
      "tree": "b5a6a17f1cd9c98374b91feafcf554bf5197c44d",
      "parents": [
        "d8dd0b45438d62fc4a93d8e3cee9985710d01e40"
      ],
      "author": {
        "name": "Aneesh Kumar K.V",
        "email": "aneesh.kumar@linux.vnet.ibm.com",
        "time": "Tue Oct 16 18:38:25 2007 -0400"
      },
      "committer": {
        "name": "Theodore Ts\u0027o",
        "email": "tytso@mit.edu",
        "time": "Wed Oct 17 18:50:03 2007 -0400"
      },
      "message": "ext4: sparse fixes\n\nSigned-off-by: Aneesh Kumar K.V \u003caneesh.kumar@linux.vnet.ibm.com\u003e\n"
    },
    {
      "commit": "dab291af8d6307a3075c3d67d0cc8f98e646cb94",
      "tree": "a2207ab3e2e00472e5e3c969ad0dd211fb9e4151",
      "parents": [
        "a920e9416b3469994860ab552dfd7fd5a5aff162"
      ],
      "author": {
        "name": "Mingming Cao",
        "email": "cmm@us.ibm.com",
        "time": "Wed Oct 11 01:21:01 2006 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Wed Oct 11 11:14:16 2006 -0700"
      },
      "message": "[PATCH] jbd2: enable building of jbd2 and have ext4 use it rather than jbd\n\nReworked from a patch by Mingming Cao and Randy Dunlap\n\nSigned-off-By: Randy Dunlap \u003crdunlap@xenotime.net\u003e\nSigned-off-by: Mingming Cao \u003ccmm@us.ibm.com\u003e\nSigned-off-by: Dave Kleikamp \u003cshaggy@austin.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "617ba13b31fbf505cc21799826639ef24ed94af0",
      "tree": "2a41e8c993f7c1eed115ad24047d546ba56cbdf5",
      "parents": [
        "ac27a0ec112a089f1a5102bc8dffc79c8c815571"
      ],
      "author": {
        "name": "Mingming Cao",
        "email": "cmm@us.ibm.com",
        "time": "Wed Oct 11 01:20:53 2006 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Wed Oct 11 11:14:15 2006 -0700"
      },
      "message": "[PATCH] ext4: rename ext4 symbols to avoid duplication of ext3 symbols\n\nMingming Cao originally did this work, and Shaggy reproduced it using some\nscripts from her.\n\nSigned-off-by: Mingming Cao \u003ccmm@us.ibm.com\u003e\nSigned-off-by: Dave Kleikamp \u003cshaggy@austin.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "ac27a0ec112a089f1a5102bc8dffc79c8c815571",
      "tree": "bcbcc0a5a88bf99b35119d9d9d660a37c503d787",
      "parents": [
        "502717f4e112b18d9c37753a32f675bec9f2838b"
      ],
      "author": {
        "name": "Dave Kleikamp",
        "email": "shaggy@austin.ibm.com",
        "time": "Wed Oct 11 01:20:50 2006 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Wed Oct 11 11:14:15 2006 -0700"
      },
      "message": "[PATCH] ext4: initial copy of files from ext3\n\nStart of the ext4 patch series.  See Documentation/filesystems/ext4.txt for\ndetails.\n\nThis is a simple copy of the files in fs/ext3 to fs/ext4 and\n/usr/incude/linux/ext3* to /usr/include/ex4*\n\nSigned-off-by: Dave Kleikamp \u003cshaggy@austin.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    }
  ]
}