On Wed, Aug 03, 2011 at 08:07:42PM +0200, David Sterba wrote: > I'm working on a patch to fix cross-volume cloning, worked for simple cases > like cloning a single file. When I cloned a full linux-2.6 tree there was a > immediate BUG_ON (after third cloned file) in btrfs_delayed_update_inode > with -ENOSPC :
oh, a similar issue was already reported on 5 Jul 2011: "[BUG] delayed inodes and reflinks" http://permalink.gmane.org/gmane.comp.file-systems.btrfs/11763 Jan Schmidt wrote: > If I get back to a situation where I can reproduce the bug, I'll send > a follow up. I do have a reproducer: $ mkfs.btrfs $ mount ... $ btrfs subvol create subvol1 $ btrfs subvol create subvol2 $ cp linux-2.6 subvol1 $ (in subvol1) find linux-2.6 -type d -exec mkdir -p ../subvol2/'{}' \; $ (in subvol1) find linux-2.6 -type f -exec ./clone-file '{}' ../subvol2/'{}' \; and this backtrace follows ... david > [ 925.546266] ------------[ cut here ]------------ > [ 925.549921] kernel BUG at fs/btrfs/delayed-inode.c:1693! > [ 925.549921] invalid opcode: 0000 [#1] SMP > [ 925.549921] CPU 0 > [ 925.549921] Modules linked in: btrfs > [ 925.549921] > [ 925.549921] Pid: 31167, comm: clone-file Not tainted 3.0.0-default+ #98 > Intel Corporation Santa Rosa platform/Matanzas > [ 925.549921] RIP: 0010:[<ffffffffa00790e0>] [<ffffffffa00790e0>] > btrfs_delayed_update_inode+0x2e0/0x2f0 [btrfs] > [ 925.549921] RSP: 0018:ffff88004f229be8 EFLAGS: 00010286 > [ 925.549921] RAX: 00000000ffffffe4 RBX: ffff880048392c70 RCX: > 0000000000018000 > [ 925.549921] RDX: 0000000000001b1a RSI: 0000000000000001 RDI: > ffff88007a6f8420 > [ 925.549921] RBP: ffff88004f229c28 R08: 0000000000000004 R09: > 0000000000000000 > [ 925.549921] R10: 0000000000000000 R11: 0000000000000000 R12: > ffff880048393bf8 > [ 925.549921] R13: ffff880048392cb8 R14: ffff880050ff3540 R15: > ffff880052940000 > [ 925.549921] FS: 00007fbf18b23700(0000) GS:ffff88007dc00000(0000) > knlGS:0000000000000000 > [ 925.549921] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 925.549921] CR2: 00007fbcc68ba000 CR3: 000000004b4a8000 CR4: > 00000000000006f0 > [ 925.549921] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > 0000000000000000 > [ 925.549921] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: > 0000000000000400 > [ 925.549921] Process clone-file (pid: 31167, threadinfo ffff88004f228000, > task ffff88004b4e5140) > [ 925.549921] Stack: > [ 925.549921] ffff880048f7ddc0 0000000000018000 ffff88004f229c38 > ffff880048393bf8 > [ 925.549921] ffff880050ff3540 ffff880048393bf8 ffff880051a900a0 > ffff880052940000 > [ 925.549921] ffff88004f229c78 ffffffffa0034633 ffff88004f229c58 > ffffffffa005f08b > [ 925.549921] Call Trace: > [ 925.549921] [<ffffffffa0034633>] btrfs_update_inode+0x53/0x160 [btrfs] > [ 925.549921] [<ffffffffa005f08b>] ? btrfs_tree_unlock+0x6b/0xa0 [btrfs] > [ 925.549921] [<ffffffffa005b0ba>] btrfs_ioctl_clone+0xa0a/0xcc0 [btrfs] > [ 925.549921] [<ffffffff81168c81>] ? __do_fault+0x4a1/0x590 > [ 925.549921] [<ffffffff810daa1d>] ? lock_release_holdtime+0x3d/0x1c0 > [ 925.549921] [<ffffffff81b8dc20>] ? do_page_fault+0x2d0/0x580 > [ 925.549921] [<ffffffffa005dfcb>] btrfs_ioctl+0x2db/0xda0 [btrfs] > [ 925.549921] [<ffffffff81b8dc20>] ? do_page_fault+0x2d0/0x580 > [ 925.549921] [<ffffffff810e1467>] ? debug_check_no_locks_freed+0x177/0x180 > [ 925.549921] [<ffffffff811863c5>] ? kmem_cache_free+0xb5/0x1b0 > [ 925.549921] [<ffffffff811a5db8>] do_vfs_ioctl+0x98/0x570 > [ 925.549921] [<ffffffff8119476d>] ? fget_light+0x2fd/0x3c0 > [ 925.549921] [<ffffffff811a62df>] sys_ioctl+0x4f/0x80 > [ 925.549921] [<ffffffff81b92882>] system_call_fastpath+0x16/0x1b > [ 925.549921] Code: e8 06 00 00 8d 0c 49 48 89 ca 48 89 4d c8 e8 c8 0f fa ff > 85 c0 48 8b 4d c8 75 10 48 89 4b 08 e9 8e fd ff ff 0f 1f 80 00 00 00 00 <0f> > 0b 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 53 > [ 925.549921] RIP [<ffffffffa00790e0>] > btrfs_delayed_update_inode+0x2e0/0x2f0 [btrfs] > [ 925.549921] RSP <ffff88004f229be8> > [ 925.876182] ---[ end trace 8b4c2031e1394913 ]--- > > the patch has been applied on top of current linus which contains patches from > both pull requests (ed8f37370d83). > > The filesystem consists of 5 devices 23G each, about 100G of usable space, > mkfs.btrfs with defaults. The kernel tree has about 6G: > > $ btrfs fi df . > Data, RAID0: total=10.00GB, used=5.55GB > Data: total=8.00MB, used=0.00 > System, RAID1: total=8.00MB, used=4.00KB > System: total=4.00MB, used=0.00 > Metadata, RAID1: total=1.50GB, used=121.75MB > Metadata: total=8.00MB, used=0.00 > > $ df -h . > Filesystem Size Used Avail Use% Mounted on > /dev/sda5 110G 5.8G 82G 7% /mnt/sda5 > > ie. plenty of free space. > > It's possible that I've omitted some important bits in the patch itself, or > this exposes a bug of ENOSPC or delayed-inode. > > david > --- > > From: David Sterba <dste...@suse.cz> > > Lift the EXDEV condition and allow different root trees for files being > cloned, then pass source inode's root when searching for extents. > > Signed-off-by: David Sterba <dste...@suse.cz> > --- > fs/btrfs/ioctl.c | 7 ++++--- > 1 files changed, 4 insertions(+), 3 deletions(-) > > diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c > index 0b980af..58eb0ef 100644 > --- a/fs/btrfs/ioctl.c > +++ b/fs/btrfs/ioctl.c > @@ -2183,7 +2183,7 @@ static noinline long btrfs_ioctl_clone(struct file > *file, unsigned long srcfd, > goto out_fput; > > ret = -EXDEV; > - if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) > + if (src->i_sb != inode->i_sb) > goto out_fput; > > ret = -ENOMEM; > @@ -2247,13 +2247,14 @@ static noinline long btrfs_ioctl_clone(struct file > *file, unsigned long srcfd, > * note the key will change type as we walk through the > * tree. > */ > - ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); > + ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, > + 0, 0); > if (ret < 0) > goto out; > > nritems = btrfs_header_nritems(path->nodes[0]); > if (path->slots[0] >= nritems) { > - ret = btrfs_next_leaf(root, path); > + ret = btrfs_next_leaf(BTRFS_I(src)->root, path); > if (ret < 0) > goto out; > if (ret > 0) > -- > > $ cat clone-file.c > #include <stdio.h> > #include <sys/ioctl.h> > #include <sys/fcntl.h> > #include "ioctl.h" > > /* > * usage: $0 input output > * input: existing > * output: newly created from input > */ > int main(int argc, char **argv) { > int infd, outfd; > int ret; > > printf("input: %s\n", argv[1]); > printf("output: %s\n", argv[2]); > > infd=open(argv[1], O_RDONLY); > if(infd == -1) { > perror("cannot open input file"); > return 1; > } > outfd=open(argv[2], O_RDWR | O_CREAT | O_EXCL, 0644); > if(outfd == -1) { > perror("cannot open output file"); > return 2; > } > ret = ioctl(outfd, BTRFS_IOC_CLONE, infd); > if(ret == -1) { > perror("ioctl(CLONE)"); > return 3; > } > return 0; > } > -- > 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 -- 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
