Maybe my question is stupid, but I'll post it anyway. Where can I get the patches for online defrag? Thanks, Andreas -- Andreas Philipp Institute for Mathematics and Scientific Computing University of Graz Heinrichstrasse 36 8010 Graz Austria phone: ++43 316 380 5155 e-mail: andreas.philipp@xxxxxxxxxxx web site: http://www.uni-graz.at/~philippa/ On Friday 12 June 2009 01:03:32 Greg Freemyer wrote: > Ted / Akira, > > What's the status of this. I certainly like the ABI much better now > than on the previous try. > > I don't know the ext4 code internally so I can't speak to the > implementation quality, but I know this has been floating around for a > long time and seems to just be getting better and better. > > Any chance of it being merged soon? > > Thanks > Greg > > 2009/5/22 Akira Fujita <a-fujita@xxxxxxxxxxxxx>: > > Hi, > > > > There are the updated patches for ext4 online defrag. > > I have addressed the comments that I had got about defrag V1 > > (http://marc.info/?l=linux-ext4&m=123329594919001&w=3). > > Changes of this version are as follows: > > > > - Change function name from ext4_defrag_xxx to ext4_mext_xxx > > and also change the source file name from defrag.c to move_extent.c. > > - Disallow swapfile defrag. > > - Support uninitialized extent defrag. > > - Disallow data write out for uninitalized extent. > > - Call fget() and fput() instead of fget_light() and fput_light() > > for module compile. > > - Acquire mutex and semaphore of orig and donor inodes by i_ino order. > > - Localized semaphore acquisition/release. > > - Add ext4_mext_inode_double_lock/unlock() for i_mutex lock/unlock, > > since inode_double_lock/unlock() have been removed. > > - Replace random printk() with ext4_debug(). > > - Some cleanups. > > > > Ext4 online defrag uses EXT4_IOC_MOVE_EXT ioctl and move_extent > > structure. > > > > #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct > > move_extent) > > > > struct move_extent { > > int orig_fd; /* original file descriptor */ > > int donor_fd; /* donor file descriptor */ > > __u64 orig_start; /* logical start offset in block for orig > > */ __u64 donor_start; /* logical start offset in block for donor */ > > __u64 len; /* block length to be moved */ > > __u64 moved_len; /* moved block length */ > > }; > > > > > > Ext4 online defrag is done in the following steps: > > (U:User space K:Kernel space) > > > > 1:U Create donor inode and then call unlink() to it. > > > > 2:U Allocate contiguous blocks to donor inode with fallocate(). > > > > 3:U Call the FS_IOC_FIEMAP ioctl to get the extents information of donor > > inode. And check the extents of donor inode are less than the defrag > > target inode's. > > > > 4:U Call the EXT4_IOC_MOVE_EXT ioctl extent unit. > > > > 5:K In kernel space, the EXT4_IOC_MOVE_EXT ioctl calls > > ext4_mext_move_extent() to exchange the blocks between orig_fd and > > donor_fd. > > Then write the file data of orig_fd to donor_fd. > > > > 6:U Close donor inode, then it will be deleted. > > > > Note: More tests may be needed without journal, > > so I recommend that e4defrag is run on ext4 with journal. > > > > Summary of patch series: > > * The patch can be applied to the ext4 patch queue (2.6.30-rc6). > > > > [PATCH 1/3] Add EXT4_IOC_DEFRAG ioctl and defrag functions > > - Add EXT4_IOC_DEFRAG ioctl and related functions. > > - For each page, exchange the extents between original inode > > and donor inode, and then write the file data of > > the original inode to donor inode. > > > > [PATCH 2/3] Ext4 online defrag command > > - Usage is as follows: > > - Defrag for a single file. > > # e4defrag file, directory, device > > - Check the file fragments on ext4. > > # e4defrag -c file, directory, device > > > > [PATCH 3/3] Manpage of e4defrag > > - Ext4 online defrag command manpage > > # nroff -man e4defrag.8 > > > > Best regards, > > Akira Fujita > > > > -- > > 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 -- 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
