Re: btrfs defrag problem
David Sterba wrote (ao): On Thu, Nov 01, 2012 at 05:17:04AM +0800, ching wrote: when a device is mounted under a directory, files in the directory is hidden, and files in the device is available, right? when a directory is polyinstantied, files in the original directory is hidden, and files in the polyinstantied directory is available, How to get past them and pass those hidden files to defrag command? I hope I get it right, so unless you have a reference to the directory with hidden files (using your term), there's no way to access them. And this is a more generic question, not related to btrfs itself. The hidden files may also belong to a different filesystem. What Ching means (I think), is that if you have directories in /home, and you mount a device onto /home, you cannot see the original directories in /home anymore. You can still access them though, with a 'mount -o bind': # mount -o bind / /mnt # ls /mnt/home Sander -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: btrfs defrag problem
On Thu, Nov 01, 2012 at 05:17:04AM +0800, ching wrote: 3. Is any possible to online defrag a btrfs partition without hindered by mount point/polyinstantied directories? Sorry, I do not understand the question. when a device is mounted under a directory, files in the directory is hidden, and files in the device is available, right? when a directory is polyinstantied, files in the original directory is hidden, and files in the polyinstantied directory is available, How to get past them and pass those hidden files to defrag command? I hope I get it right, so unless you have a reference to the directory with hidden files (using your term), there's no way to access them. And this is a more generic question, not related to btrfs itself. The hidden files may also belong to a different filesystem. david -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: btrfs defrag problem
On 11/06/2012 06:57 AM, David Sterba wrote: On Thu, Nov 01, 2012 at 05:17:04AM +0800, ching wrote: 3. Is any possible to online defrag a btrfs partition without hindered by mount point/polyinstantied directories? Sorry, I do not understand the question. when a device is mounted under a directory, files in the directory is hidden, and files in the device is available, right? when a directory is polyinstantied, files in the original directory is hidden, and files in the polyinstantied directory is available, How to get past them and pass those hidden files to defrag command? I hope I get it right, so unless you have a reference to the directory with hidden files (using your term), there's no way to access them. And this is a more generic question, not related to btrfs itself. The hidden files may also belong to a different filesystem. david thank for your explanation ching -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: btrfs defrag problem
It seems that locked files cannot be defragged, is it expected behaviour? Yes. but i am defragging a file, not modify it. 2. Btrfs Wiki mentions that defrag directory will defrag metadata, is symlink/hardlink considered as metadata? P.S. inline data is already disabled by max_inline=0 Both -links are metadata and also stored inside metadata blocks without any chance to move to data blocks, so max_inline does not affect this. thank you for your explanation. 3. Is any possible to online defrag a btrfs partition without hindered by mount point/polyinstantied directories? Sorry, I do not understand the question. when a device is mounted under a directory, files in the directory is hidden, and files in the device is available, right? when a directory is polyinstantied, files in the original directory is hidden, and files in the polyinstantied directory is available, How to get past them and pass those hidden files to defrag command? ching -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
btrfs defrag problem
Hi all, I try to defrag my btrfs root partition (run by root privilege) find / -type f -o -type d -print0 | xargs --null --no-run-if-empty btrfs filesystem defragment -t $((32*1024*1024)) 1. This kind of error messages is prompted: failed to open /bin/bash open:: Text file busy total 1 failures failed to open /lib64/ld-2.15.so open:: Text file busy total 1 failures failed to open /sbin/agetty open:: Text file busy failed to open /sbin/btrfs open:: Text file busy failed to open /sbin/dhclient open:: Text file busy failed to open /sbin/init open:: Text file busy failed to open /sbin/udevd It seems that locked files cannot be defragged, is it expected behaviour? 2. Btrfs Wiki mentions that defrag directory will defrag metadata, is symlink/hardlink considered as metadata? P.S. inline data is already disabled by max_inline=0 3. Is any possible to online defrag a btrfs partition without hindered by mount point/polyinstantied directories? Thank you. ching -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: btrfs defrag problem
On Tue, Oct 30, 2012 at 5:47 AM, ching lschin...@gmail.com wrote: Hi all, I try to defrag my btrfs root partition (run by root privilege) find / -type f -o -type d -print0 | xargs --null --no-run-if-empty btrfs filesystem defragment -t $((32*1024*1024)) 1. This kind of error messages is prompted: failed to open /bin/bash open:: Text file busy total 1 failures failed to open /lib64/ld-2.15.so open:: Text file busy total 1 failures failed to open /sbin/agetty open:: Text file busy failed to open /sbin/btrfs open:: Text file busy failed to open /sbin/dhclient open:: Text file busy failed to open /sbin/init open:: Text file busy failed to open /sbin/udevd It seems that locked files cannot be defragged, is it expected behaviour? I can't reproduce that behaviour here, although maybe you're running an older kernel with some bug that's since been fixed? 2. Btrfs Wiki mentions that defrag directory will defrag metadata, is symlink/hardlink considered as metadata? P.S. inline data is already disabled by max_inline=0 Well, that's a silly thing to do, causing every small file to take up a separate 4kb block rather than its size * 2, and requiring extra seeks to read/write them (i.e., if you have a million 10 byte files, they'll now take up 4GB instead of 20MB). 3. Is any possible to online defrag a btrfs partition without hindered by mount point/polyinstantied directories? If you're asking if you can defrag an unmounted btrfs, not at this time. It's possible in principle, nobody has cared enough to implement it yet. -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: btrfs defrag problem
On 10/30/2012 08:08 PM, cwillu wrote: On Tue, Oct 30, 2012 at 5:47 AM, ching lschin...@gmail.com wrote: Hi all, I try to defrag my btrfs root partition (run by root privilege) find / -type f -o -type d -print0 | xargs --null --no-run-if-empty btrfs filesystem defragment -t $((32*1024*1024)) 1. This kind of error messages is prompted: failed to open /bin/bash open:: Text file busy total 1 failures failed to open /lib64/ld-2.15.so open:: Text file busy total 1 failures failed to open /sbin/agetty open:: Text file busy failed to open /sbin/btrfs open:: Text file busy failed to open /sbin/dhclient open:: Text file busy failed to open /sbin/init open:: Text file busy failed to open /sbin/udevd It seems that locked files cannot be defragged, is it expected behaviour? I can't reproduce that behaviour here, although maybe you're running an older kernel with some bug that's since been fixed? I am running Gentoo with Kernel 3.6.3 x64, btrfs-progs git version my root is mounted with noatime,space_cache,inode_cache,metadata_ratio=15,max_inline=0,ssd_spread 2. Btrfs Wiki mentions that defrag directory will defrag metadata, is symlink/hardlink considered as metadata? P.S. inline data is already disabled by max_inline=0 Well, that's a silly thing to do, causing every small file to take up a separate 4kb block rather than its size * 2, and requiring extra seeks to read/write them (i.e., if you have a million 10 byte files, they'll now take up 4GB instead of 20MB). this is off-topic to my question. 3. Is any possible to online defrag a btrfs partition without hindered by mount point/polyinstantied directories? If you're asking if you can defrag an unmounted btrfs, not at this time. It's possible in principle, nobody has cared enough to implement it yet. -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: btrfs defrag problem
On Tue, Oct 30, 2012 at 07:47:28PM +0800, ching wrote: failed to open /bin/bash open:: Text file busy That's not a btrfs problem, you can't directly modify an executable that is being used. failed to open /lib64/ld-2.15.so failed to open /sbin/agetty failed to open /sbin/btrfs failed to open /sbin/dhclient failed to open /sbin/init failed to open /sbin/udevd libraries, currently executed progs or daemons It seems that locked files cannot be defragged, is it expected behaviour? Yes. 2. Btrfs Wiki mentions that defrag directory will defrag metadata, is symlink/hardlink considered as metadata? P.S. inline data is already disabled by max_inline=0 Both -links are metadata and also stored inside metadata blocks without any chance to move to data blocks, so max_inline does not affect this. 3. Is any possible to online defrag a btrfs partition without hindered by mount point/polyinstantied directories? Sorry, I do not understand the question. david -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
