Re: [RFC 1/1] shiftfs: uid/gid shifting bind mount

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Hey James,

yeah that's a lot better.  I do still get some syslog messages,
but i was trivially able to bind a shiftfs into a container and
use it the way I'd want.

[  209.452274] ------------[ cut here ]------------
[  209.452296] WARNING: CPU: 0 PID: 3072 at fs/ext4/inode.c:3977 ext4_truncate+0x3f5/0x5b0
[  209.452299] Modules linked in: binfmt_misc veth ip6t_MASQUERADE nf_nat_masquerade_ipv6 ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6_tables xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables ppdev kvm_intel kvm irqbypass nls_utf8 isofs joydev input_leds serio_raw i2c_piix4 pvpanic parport_pc 8250_fintek mac_hid parport ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr configfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear cirrus ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops
[  209.452388]  psmouse drm pata_acpi floppy
[  209.452401] CPU: 0 PID: 3072 Comm: bash Not tainted 4.6.0-rc5+ #11
[  209.452404] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[  209.452407]  0000000000000286 00000000ccc8425d ffff88007a1cfa98 ffffffff8145dae3
[  209.452412]  0000000000000000 0000000000000000 ffff88007a1cfad8 ffffffff8108c25b
[  209.452416]  00000f897a1cfaf8 ffff880052efe340 ffff88007a1cfbb8 ffff880052efe560
[  209.452421] Call Trace:
[  209.452431]  [<ffffffff8145dae3>] dump_stack+0x85/0xc2
[  209.452437]  [<ffffffff8108c25b>] __warn+0xcb/0xf0
[  209.452440]  [<ffffffff8108c38d>] warn_slowpath_null+0x1d/0x20
[  209.452444]  [<ffffffff81306d45>] ext4_truncate+0x3f5/0x5b0
[  209.452447]  [<ffffffff81309447>] ext4_setattr+0x627/0xa40
[  209.452457]  [<ffffffff813b6483>] ? security_prepare_creds+0x43/0x60
[  209.452468]  [<ffffffff810b63d2>] ? creds_are_invalid.part.1+0x12/0x40
[  209.452478]  [<ffffffff81396491>] shiftfs_setattr+0x181/0x202
[  209.452492]  [<ffffffff812831f5>] notify_change+0x235/0x360
[  209.452500]  [<ffffffff8125f057>] do_truncate+0x77/0xc0
[  209.452505]  [<ffffffff81271959>] path_openat+0x269/0x1350
[  209.452509]  [<ffffffff81273f01>] do_filp_open+0x91/0x100
[  209.452517]  [<ffffffff819036d7>] ? _raw_spin_unlock+0x27/0x40
[  209.452522]  [<ffffffff81284799>] ? __alloc_fd+0xf9/0x210
[  209.452526]  [<ffffffff81260654>] do_sys_open+0x124/0x210
[  209.452529]  [<ffffffff8126075e>] SyS_open+0x1e/0x20
[  209.452534]  [<ffffffff81003f89>] do_syscall_64+0x69/0x160
[  209.452537]  [<ffffffff81904103>] entry_SYSCALL64_slow_path+0x25/0x25
[  209.452541] ---[ end trace b995e24e590f8b85 ]---
[  209.452790] ------------[ cut here ]------------
[  209.452800] WARNING: CPU: 0 PID: 3072 at fs/ext4/namei.c:2778 ext4_orphan_add+0x11a/0x290
[  209.452803] Modules linked in: binfmt_misc veth ip6t_MASQUERADE nf_nat_masquerade_ipv6 ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6_tables xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables ppdev kvm_intel kvm irqbypass nls_utf8 isofs joydev input_leds serio_raw i2c_piix4 pvpanic parport_pc 8250_fintek mac_hid parport ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr configfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear cirrus ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops
[  209.452896]  psmouse drm pata_acpi floppy
[  209.452903] CPU: 0 PID: 3072 Comm: bash Tainted: G        W       4.6.0-rc5+ #11
[  209.452905] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[  209.452907]  0000000000000286 00000000ccc8425d ffff88007a1cfa30 ffffffff8145dae3
[  209.452912]  0000000000000000 0000000000000000 ffff88007a1cfa70 ffffffff8108c25b
[  209.452917]  00000ada00000008 ffff880052efe340 ffff88007c3ba0c0 ffff880036806000
[  209.452921] Call Trace:
[  209.452925]  [<ffffffff8145dae3>] dump_stack+0x85/0xc2
[  209.452929]  [<ffffffff8108c25b>] __warn+0xcb/0xf0
[  209.452933]  [<ffffffff8108c38d>] warn_slowpath_null+0x1d/0x20
[  209.452936]  [<ffffffff813126ca>] ext4_orphan_add+0x11a/0x290
[  209.452940]  [<ffffffff81306a9e>] ? ext4_truncate+0x14e/0x5b0
[  209.452948]  [<ffffffff81338b98>] ? __ext4_journal_start_sb+0x88/0x1f0
[  209.452953]  [<ffffffff81306ad1>] ext4_truncate+0x181/0x5b0
[  209.452956]  [<ffffffff81309447>] ext4_setattr+0x627/0xa40
[  209.452960]  [<ffffffff813b6483>] ? security_prepare_creds+0x43/0x60
[  209.452964]  [<ffffffff810b63d2>] ? creds_are_invalid.part.1+0x12/0x40
[  209.452967]  [<ffffffff81396491>] shiftfs_setattr+0x181/0x202
[  209.452971]  [<ffffffff812831f5>] notify_change+0x235/0x360
[  209.452975]  [<ffffffff8125f057>] do_truncate+0x77/0xc0
[  209.452978]  [<ffffffff81271959>] path_openat+0x269/0x1350
[  209.452982]  [<ffffffff81273f01>] do_filp_open+0x91/0x100
[  209.452986]  [<ffffffff819036d7>] ? _raw_spin_unlock+0x27/0x40
[  209.452989]  [<ffffffff81284799>] ? __alloc_fd+0xf9/0x210
[  209.452993]  [<ffffffff81260654>] do_sys_open+0x124/0x210
[  209.452997]  [<ffffffff8126075e>] SyS_open+0x1e/0x20
[  209.453001]  [<ffffffff81003f89>] do_syscall_64+0x69/0x160
[  209.453004]  [<ffffffff81904103>] entry_SYSCALL64_slow_path+0x25/0x25
[  209.453007] ---[ end trace b995e24e590f8b86 ]---
[  209.453541] ------------[ cut here ]------------
[  209.453548] WARNING: CPU: 0 PID: 3072 at fs/ext4/namei.c:2860 ext4_orphan_del+0x18c/0x2a0
[  209.453550] Modules linked in: binfmt_misc veth ip6t_MASQUERADE nf_nat_masquerade_ipv6 ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6_tables xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables ppdev kvm_intel kvm irqbypass nls_utf8 isofs joydev input_leds serio_raw i2c_piix4 pvpanic parport_pc 8250_fintek mac_hid parport ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr configfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear cirrus ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops
[  209.453625]  psmouse drm pata_acpi floppy
[  209.453632] CPU: 0 PID: 3072 Comm: bash Tainted: G        W       4.6.0-rc5+ #11
[  209.453635] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[  209.453637]  0000000000000286 00000000ccc8425d ffff88007a1cfa18 ffffffff8145dae3
[  209.453641]  0000000000000000 0000000000000000 ffff88007a1cfa58 ffffffff8108c25b
[  209.453646]  00000b2c8103fca9 ffff880052efe340 ffff88007c3ba0c0 ffff88007c3ba0c0
[  209.453650] Call Trace:
[  209.453655]  [<ffffffff8145dae3>] dump_stack+0x85/0xc2
[  209.453658]  [<ffffffff8108c25b>] __warn+0xcb/0xf0
[  209.453662]  [<ffffffff8108c38d>] warn_slowpath_null+0x1d/0x20
[  209.453665]  [<ffffffff81313d0c>] ext4_orphan_del+0x18c/0x2a0
[  209.453668]  [<ffffffff81903cf7>] ? _raw_write_unlock+0x27/0x40
[  209.453673]  [<ffffffff81306d72>] ext4_truncate+0x422/0x5b0
[  209.453692]  [<ffffffff81309447>] ext4_setattr+0x627/0xa40
[  209.453697]  [<ffffffff813b6483>] ? security_prepare_creds+0x43/0x60
[  209.453701]  [<ffffffff810b63d2>] ? creds_are_invalid.part.1+0x12/0x40
[  209.453705]  [<ffffffff81396491>] shiftfs_setattr+0x181/0x202
[  209.453709]  [<ffffffff812831f5>] notify_change+0x235/0x360
[  209.453712]  [<ffffffff8125f057>] do_truncate+0x77/0xc0
[  209.453716]  [<ffffffff81271959>] path_openat+0x269/0x1350
[  209.453720]  [<ffffffff81273f01>] do_filp_open+0x91/0x100
[  209.453724]  [<ffffffff819036d7>] ? _raw_spin_unlock+0x27/0x40
[  209.453727]  [<ffffffff81284799>] ? __alloc_fd+0xf9/0x210
[  209.453731]  [<ffffffff81260654>] do_sys_open+0x124/0x210
[  209.453734]  [<ffffffff8126075e>] SyS_open+0x1e/0x20
[  209.453738]  [<ffffffff81003f89>] do_syscall_64+0x69/0x160
[  209.453741]  [<ffffffff81904103>] entry_SYSCALL64_slow_path+0x25/0x25
[  209.453745] ---[ end trace b995e24e590f8b87 ]---
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