1. 15 Mar, 2010 8 commits
    • Chris Mason's avatar
      Btrfs: be more selective in the defrag ioctl · 940100a4
      Chris Mason authored
      The btrfs defrag ioctl had some bugs around delalloc accounting, and it
      wasn't properly skipping pages that were not in the mapping.
      It wasn't properly clearing the page checked flag, which could make the
      writeback code ignore the page forever while pinning it as dirty.
      This commit fixes those problems and makes defrag a little smarter.  It
      skips holes and it doesn't waste time defragging large extents.  If a
      tiny extent comes before a very large extent, it will defrag both of
      them to make sure the tiny extent ends up next to something big.
      Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    • Chris Mason's avatar
      Btrfs: run the backing dev more often in the submit_bio helper · 51684082
      Chris Mason authored
      The submit_bio helper thread can decide to loop back around to
      service more bios.  This commit forces it to unplug first, which helps
      reduce the latency seen by submitters.
      Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    • Josef Bacik's avatar
      Btrfs: make subvolid=0 mount the original default root · 4849f01d
      Josef Bacik authored
      Since theres not a good way to make sure the user sees the original default root
      tree id, and not to mention it's 5 so is way different than any other volume,
      just make subvol=0 mount the original default root.  This makes it a bit easier
      for users to handle in the long run.  Thanks,
      Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
      Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    • Josef Bacik's avatar
      Btrfs: add ioctl and incompat flag to set the default mount subvol · 6ef5ed0d
      Josef Bacik authored
      This patch needs to go along with my previous patch.  This lets us set the
      default dir item's location to whatever root we want to use as our default
      mounting subvol.  With this we don't have to use mount -o subvol=<tree id>
      anymore to mount a different subvol, we can just set the new one and it will
      just magically work.  I've done some moderate testing with this, mostly just
      switching the default mount around, mounting subvols and the default mount at
      the same time and such, everything seems to work.  Thanks,
      Older kernels would generally be able to still mount the filesystem with the
      default subvolume set, but it would result in a different volume being mounted,
      which could be an even more unpleasant suprise for users.  So if you set your
      default subvolume, you can't go back to older kernels.  Thanks,
      Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
      Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    • Josef Bacik's avatar
      Btrfs: change how we mount subvolumes · 73f73415
      Josef Bacik authored
      This work is in preperation for being able to set a different root as the
      default mounting root.
      There is currently a problem with how we mount subvolumes.  We cannot currently
      mount a subvolume of a subvolume, you can only mount subvolumes/snapshots of the
      default subvolume.  So say you take a snapshot of the default subvolume and call
      it snap1, and then take a snapshot of snap1 and call it snap2, so now you have
      as your available volumes.  Currently you can only mount / and /snap1,
      you cannot mount /snap1/snap2.  To fix this problem instead of passing
      subvolid=<name> you must pass in subvolid=<treeid>, where <treeid> is
      the tree id that gets spit out via the subvolume listing you get from
      the subvolume listing patches (btrfs filesystem list).  This allows us
      to mount /, /snap1 and /snap1/snap2 as the root volume.
      In addition to the above, we also now read the default dir item in the
      tree root to get the root key that it points to.  For now this just
      points at what has always been the default subvolme, but later on I plan
      to change it to point at whatever root you want to be the new default
      root, so you can just set the default mount and not have to mount with
      -o subvolid=<treeid>.  I tested this out with the above scenario and it
      worked perfectly.  Thanks,
      mount -o subvol operates inside the selected subvolid.  For example:
      mount -o subvol=snap1,subvolid=256 /dev/xxx /mnt
      /mnt will have the snap1 directory for the subvolume with id
      mount -o subvol=snap /dev/xxx /mnt
      /mnt will be the snap directory of whatever the default subvolume
      Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
      Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    • Josef Bacik's avatar
      Btrfs: make set/get functions for the super compat_ro flags use compat_ro · 12534832
      Josef Bacik authored
      Our set/get functions for compat_ro_flags actually look at compat_flags.  This
      will mess any attempt to use compat flags up.  The fix is obvious.  Thanks,
      Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
      Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    • Chris Mason's avatar
      Btrfs: add search and inode lookup ioctls · ac8e9819
      Chris Mason authored
      The search ioctl is a generic tool for doing btree searches from
      userland applications.  The first user of the search ioctl is a
      subvolume listing feature, but we'll also use it to find new
      files in a subvolume.
      The search ioctl allows you to specify min and max keys to search for,
      along with min and max transid.  It returns the items along with a
      header that includes the item key.
      Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    • TARUISI Hiroaki's avatar
      Btrfs: add a function to lookup a directory path by following backrefs · 98d377a0
      TARUISI Hiroaki authored
      This will be used by the inode lookup ioctl.
      Signed-off-by: default avatarTARUISI Hiroaki <taruishi.hiroak@jp.fujitsu.com>
      Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
  2. 08 Mar, 2010 2 commits
  3. 12 Feb, 2010 1 commit
  4. 04 Feb, 2010 6 commits
  5. 28 Jan, 2010 8 commits
  6. 17 Jan, 2010 7 commits
    • Josef Bacik's avatar
      Btrfs: fix possible panic on unmount · 11dfe35a
      Josef Bacik authored
      We can race with the unmount of an fs and the stopping of a kthread where we
      will free the block group before we're done using it.  The reason for this is
      because we do not hold a reference on the block group while its caching, since
      the allocator drops its reference once it exits or moves on to the next block
      group.  This patch fixes the problem by taking a reference to the block group
      before we start caching and dropping it when we're done to make sure all
      accesses to the block group are safe.  Thanks,
      Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
      Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    • Chris Mason's avatar
      Btrfs: deal with NULL acl sent to btrfs_set_acl · a9cc71a6
      Chris Mason authored
      It is legal for btrfs_set_acl to be sent a NULL acl.  This
      makes sure we don't dereference it.  A similar patch was sent by
      Johannes Hirte <johannes.hirte@fem.tu-ilmenau.de>
      Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    • Josef Bacik's avatar
      Btrfs: fix regression in orphan cleanup · 6c090a11
      Josef Bacik authored
      Currently orphan cleanup only ever gets triggered if we cross subvolumes during
      a lookup, which means that if we just mount a plain jane fs that has orphans in
      it, they will never get cleaned up.  This results in panic's like these
      where adding an orphan entry results in -EEXIST being returned and we panic.  In
      order to fix this, we check to see on lookup if our root has had the orphan
      cleanup done, and if not go ahead and do it.  This is easily reproduceable by
      running this testcase
      #include <sys/types.h>
      #include <sys/stat.h>
      #include <fcntl.h>
      #include <string.h>
      #include <unistd.h>
      #include <stdio.h>
      int main(int argc, char **argv)
      	char data[4096];
      	char newdata[4096];
      	int fd1, fd2;
      	memset(data, 'a', 4096);
      	memset(newdata, 'b', 4096);
      	while (1) {
      		int i;
      		fd1 = creat("file1", 0666);
      		if (fd1 < 0)
      		for (i = 0; i < 512; i++)
      			write(fd1, data, 4096);
      		fd2 = creat("file2", 0666);
      		if (fd2 < 0)
      		ftruncate(fd2, 4096 * 512);
      		for (i = 0; i < 512; i++)
      			write(fd2, newdata, 4096);
      		i = rename("file2", "file1");
      	return 0;
      and then pulling the power on the box, and then trying to run that test again
      when the box comes back up.  I've tested this locally and it fixes the problem.
      Thanks to Tomas Carnecky for helping me track this down initially.
      Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
      Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    • Yan, Zheng's avatar
      Btrfs: Fix race in btrfs_mark_extent_written · 6c7d54ac
      Yan, Zheng authored
      Fix bug reported by Johannes Hirte. The reason of that bug
      is btrfs_del_items is called after btrfs_duplicate_item and
      btrfs_del_items triggers tree balance. The fix is check that
      case and call btrfs_search_slot when needed.
      Signed-off-by: default avatarYan Zheng <zheng.yan@oracle.com>
      Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    • Jiri Slaby's avatar
      Btrfs, fix memory leaks in error paths · 2423fdfb
      Jiri Slaby authored
      Stanse found 2 memory leaks in relocate_block_group and
      __btrfs_map_block. cluster and multi are not freed/assigned on all
      paths. Fix that.
      Signed-off-by: default avatarJiri Slaby <jslaby@suse.cz>
      Cc: linux-btrfs@vger.kernel.org
      Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    • Yan, Zheng's avatar
      Btrfs: align offsets for btrfs_ordered_update_i_size · a038fab0
      Yan, Zheng authored
      Some callers of btrfs_ordered_update_i_size can now pass in
      a NULL for the ordered extent to update against.  This makes
      sure we properly align the offset they pass in when deciding
      how much to bump the on disk i_size.
      Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    • Jan Engelhardt's avatar
      btrfs: fix missing last-entry in readdir(3) · 406266ab
      Jan Engelhardt authored
      parent 49313cdac7b34c9f7ecbb1780cfc648b1c082cd7 (v2.6.32-1-g49313cd)
      commit ff48c08e1c05c67e8348ab6f8a24de8034e0e34d
      Author: Jan Engelhardt <jengelh@medozas.de>
      Date:   Wed Dec 9 22:57:36 2009 +0100
      Btrfs: fix missing last-entry in readdir(3)
      When one does a 32-bit readdir(3), the last entry of a directory is
      missing. This is however not due to passing a large value to filldir,
      but it seems to have to do with glibc doing telldir or something
      quirky. In any case, this patch fixes it in practice.
      Signed-off-by: default avatarJan Engelhardt <jengelh@medozas.de>
      Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
  7. 17 Dec, 2009 8 commits