Hello, On a 3.6.0-rc7 kernel, I launched:
# btrfs fi balance start -f -mconvert=single /mnt/tmp/ Current situation: # df -h /mnt/tmp/ Filesystem Size Used Avail Use% Mounted on /dev/mapper/alpha-lv1 3.6T 2.7T 801G 78% /mnt/tmp # btrfs fi df /mnt/tmp/ Data: total=3.00TB, used=2.66TB System: total=4.00MB, used=364.00KB Metadata, DUP: total=11.00GB, used=5.72GB Metadata: total=63.00GB, used=0.00 There seems to be plenty of free space, but the balance seems to have stalled and the dmesg is being filled with messages like this: [ 2926.465406] btrfs: block rsv returned -28 [ 2926.465411] ------------[ cut here ]------------ [ 2926.465446] WARNING: at /home/apw/COD/linux/fs/btrfs/extent-tree.c:6323 use_block_rsv+0x19f/0x1b0 [btrfs]() [ 2926.465450] Hardware name: VirtualBox [ 2926.465452] Modules linked in: joydev microcode parport_pc hid_generic parport psmouse serio_raw pcspkr i2c_piix4 mac_hid xfs btrfs libcrc32c zlib_deflate raid456 async_raid6_recov async_memcpy async_pq async_xor xor async_tx raid6_pq usbhid hid e1000 [ 2926.465517] Pid: 4682, comm: btrfs Tainted: G W 3.6.0-030600rc7-generic #201209232235 [ 2926.465520] Call Trace: [ 2926.465532] [<ffffffff81056fff>] warn_slowpath_common+0x7f/0xc0 [ 2926.465539] [<ffffffff8105705a>] warn_slowpath_null+0x1a/0x20 [ 2926.465569] [<ffffffffa00c4edf>] use_block_rsv+0x19f/0x1b0 [btrfs] [ 2926.465599] [<ffffffffa00c860d>] btrfs_alloc_free_block+0x3d/0x220 [btrfs] [ 2926.465625] [<ffffffffa00b45b4>] ? __btrfs_cow_block+0x324/0x4f0 [btrfs] [ 2926.465663] [<ffffffffa00f516c>] ? read_extent_buffer+0xbc/0x120 [btrfs] [ 2926.465689] [<ffffffffa00b5dfc>] ? comp_keys+0x2c/0x30 [btrfs] [ 2926.465715] [<ffffffffa00b43b2>] __btrfs_cow_block+0x122/0x4f0 [btrfs] [ 2926.465745] [<ffffffffa00cfff0>] ? verify_parent_transid+0x170/0x170 [btrfs] [ 2926.465771] [<ffffffffa00b487c>] btrfs_cow_block+0xfc/0x220 [btrfs] [ 2926.465808] [<ffffffffa0117c6f>] do_relocation+0x46f/0x560 [btrfs] [ 2926.465815] [<ffffffff8169e85e>] ? _raw_spin_lock+0xe/0x20 [ 2926.465842] [<ffffffffa00bc90b>] ? block_rsv_add_bytes+0x5b/0x80 [btrfs] [ 2926.465878] [<ffffffffa0117fa4>] relocate_tree_block+0x244/0x280 [btrfs] [ 2926.465914] [<ffffffffa011be73>] relocate_tree_blocks+0x123/0x1a0 [btrfs] [ 2926.465950] [<ffffffffa011ccba>] relocate_block_group+0x1fa/0x560 [btrfs] [ 2926.466009] [<ffffffffa011d1df>] btrfs_relocate_block_group+0x1bf/0x2f0 [btrfs] [ 2926.466049] [<ffffffffa00f83a6>] btrfs_relocate_chunk.isra.53+0x56/0x3b0 [btrfs] [ 2926.466086] [<ffffffffa00eeda9>] ? release_extent_buffer.isra.37+0x39/0x60 [btrfs] [ 2926.466092] [<ffffffff8169e85e>] ? _raw_spin_lock+0xe/0x20 [ 2926.466128] [<ffffffffa00f43b7>] ? free_extent_buffer+0x37/0x90 [btrfs] [ 2926.466164] [<ffffffffa00fc602>] __btrfs_balance+0x302/0x3e0 [btrfs] [ 2926.466201] [<ffffffffa00fc9d5>] btrfs_balance+0x2f5/0x4d0 [btrfs] [ 2926.466238] [<ffffffffa0104e74>] btrfs_ioctl_balance+0x114/0x440 [btrfs] [ 2926.466275] [<ffffffffa0106938>] btrfs_ioctl+0x428/0x950 [btrfs] [ 2926.466282] [<ffffffff8115a7b6>] ? do_brk+0x226/0x300 [ 2926.466290] [<ffffffff8119878a>] do_vfs_ioctl+0x8a/0x340 [ 2926.466297] [<ffffffff81198ad1>] sys_ioctl+0x91/0xa0 [ 2926.466304] [<ffffffff816a70ad>] system_call_fastpath+0x1a/0x1f [ 2926.466308] ---[ end trace 37b1b50f9306e0b3 ]--- -- With respect, Roman ~~~~~~~~~~~~~~~~~~~~~~~~~~~ "Stallman had a printer, with code he could not see. So he began to tinker, and set the software free."
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