On Fri, Feb 08, 2013 at 04:44:00PM +0800, Zheng Liu wrote: > From: Zheng Liu <wenqing.lz@xxxxxxxxxx> > > By recording the phycisal block and status, extent status tree is able > to track the status of every extents. When we call _map_blocks > functions to lookup an extent or create a new written/unwritten/delayed > extent, this extent will be inserted into extent status tree. The hole > extent is inserted in ext4_ext_put_gap_in_cache(). If there is no any > extent, we will not insert a hole extent [0, ~0] into the extent status > tree in order to reduce the complextiy of code. > > We don't load all extents from disk in alloc_inode() because it costs > too much memory, and if a file is opened and closed frequently it will > takes too much time to load all extent information. So currently when > we create/lookup an extent, this extent will be inserted into extent > status tree. Hence, the extent status tree may not comprehensively > contain all of the extents found in the file. > > Signed-off-by: Zheng Liu <wenqing.lz@xxxxxxxxxx> > Cc: "Theodore Ts'o" <tytso@xxxxxxx> > Cc: Jan kara <jack@xxxxxxx> Unfortunately, this commit is apparently causing test failures with bigalloc: --- 013.out 2013-01-01 22:52:04.000000000 -0500 +++ 013.out.bad 2013-02-12 22:08:47.110766615 -0500 @@ -8,7 +8,4 @@ ----------------------------------------------- fsstress.2 : -p 20 -r ----------------------------------------------- - ------------------------------------------------ -fsstress.3 : -p 4 -z -f rmdir=10 -f link=10 -f creat=10 -f mkdir=10 -f rename=30 -f stat=30 -f unlink=30 -f truncate=20 ------------------------------------------------ +_check_generic_filesystem: filesystem on /dev/vdd is inconsistent (see 013.full) _check_generic_filesystem: filesystem on /dev/vdd is inconsistent (see 013.full) Ran: 013 Failures: 013 Failed 1 of 1 tests END TEST: Ext4 4k block w/bigalloc Tue Feb 12 22:08:49 EST 2013 e2fsck 1.43-WIP (15-Jan-2013) Pass 1: Checking inodes, blocks, and sizes Inode 618, i_blocks is 1408, should be 1536. Fix? yes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/vdd: ***** FILE SYSTEM WAS MODIFIED ***** /dev/vdd: 3969/81936 files (13.1% non-contiguous), 176208/1310720 blocks I haven't been able to figure out what is going on here, but if we can't figure this out I may need to push off this patch series to the next merge window. I've tried splitting up this patch into two pieces to make it clearer what is going on, but I still can't see how this would be affecting the i_blocks calculation. - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
