feat: add ut and bump go to 1.25 and FUSE3: auto-detects fusermount or fusermount3; falls back to direct mount if neither found. Configurable modes: new flags --fs-file-mode, --fs-dir-mode, --fs-link-mode (octal, e.g. 0400/0500). Non-nydus clarity: returns ENOENT for diff on non-nydus layers; blob/info still available. Crash recovery: best-effort unmount of orphan bind mounts at startup." #162

fatelei · 2025-10-26T14:54:34Z

feat: add ut and bump go to 1.25 and FUSE3: auto-detects fusermount or fusermount3; falls back to direct mount if neither found. Configurable modes: new flags --fs-file-mode, --fs-dir-mode, --fs-link-mode (octal, e.g. 0400/0500). Non-nydus clarity: returns ENOENT for diff on non-nydus layers; blob/info still available. Crash recovery: best-effort unmount of orphan bind mounts at startup."

imeoer · 2025-10-27T11:28:10Z

Thanks for the PR, we can start by fixing the broken CI and DCO check, and squashing commits. :)

Signed-off-by: fatelei <[email protected]>

…r fusermount3; falls back to direct mount if neither found. Configurable modes: new flags --fs-file-mode, --fs-dir-mode, --fs-link-mode (octal, e.g. 0400/0500). Non-nydus clarity: returns ENOENT for diff on non-nydus layers; blob/info still available. Crash recovery: best-effort unmount of orphan bind mounts at startup. Signed-off-by: fatelei <[email protected]>

Signed-off-by: fatelei <[email protected]>

nibble0x2 · 2025-12-14T04:09:51Z

was trying to run these changes locally with podman 4.9 and nydus 2.3.9 -

seems there is Loop between store/snapshotID/layerDigest/diff and rafs/snapshotId/mnt as stat command on /diff throw error Too many levels of symbolic links.

logs from sudo dmesg -w -

[177319.197683] INFO: task nydus-store:346306 blocked for more than 368 seconds.
[177319.197684]       Tainted: G           OE      6.8.0-88-generic #89-Ubuntu
[177319.197686] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[177319.197687] task:nydus-store    state:D stack:0     pid:346306 tgid:345647 ppid:291011 flags:0x00000002
[177319.197689] Call Trace:
[177319.197690]  <TASK>
[177319.197691]  __schedule+0x27c/0x6b0
[177319.197695]  schedule+0x33/0x110
[177319.197698]  d_alloc_parallel+0x30e/0x3e0
[177319.197701]  ? __pfx_default_wake_function+0x10/0x10
[177319.197704]  __lookup_slow+0x5c/0x130
[177319.197707]  walk_component+0x117/0x190
[177319.197710]  path_lookupat+0x6a/0x1b0
[177319.197713]  filename_lookup+0xe4/0x200
[177319.197718]  vfs_statx+0x95/0x1d0
[177319.197721]  vfs_fstatat+0xaa/0xe0
[177319.197723]  __do_sys_newfstatat+0x44/0x90
[177319.197727]  __x64_sys_newfstatat+0x1c/0x30
[177319.197730]  x64_sys_call+0x2505/0x25a0
[177319.197731]  do_syscall_64+0x7f/0x180
[177319.197734]  ? update_load_avg+0x82/0x850
[177319.197737]  ? update_load_avg+0x82/0x850
[177319.197739]  ? set_next_entity+0xd7/0x1a0
[177319.197741]  ? pick_next_task_fair+0x367/0x620
[177319.197744]  ? os_xsave+0x2e/0x70
[177319.197748]  ? rseq_get_rseq_cs+0x22/0x280
[177319.197751]  ? rseq_ip_fixup+0x90/0x1f0
[177319.197753]  ? restore_fpregs_from_fpstate+0x3d/0xd0
[177319.197756]  ? switch_fpu_return+0x55/0xf0
[177319.197757]  ? arch_exit_to_user_mode_prepare.isra.0+0x95/0xe0
[177319.197759]  ? irqentry_exit_to_user_mode+0x38/0x1e0
[177319.197761]  ? irqentry_exit+0x43/0x50
[177319.197763]  entry_SYSCALL_64_after_hwframe+0x78/0x80
[177319.197765] RIP: 0033:0x407d2e
[177319.197768] RSP: 002b:000000c0003e4c80 EFLAGS: 00000216 ORIG_RAX: 0000000000000106
[177319.197770] RAX: ffffffffffffffda RBX: ffffffffffffff9c RCX: 0000000000407d2e
[177319.197771] RDX: 000000c0005dec68 RSI: 000000c0000ca240 RDI: ffffffffffffff9c
[177319.197772] RBP: 000000c0003e4cc0 R08: 0000000000000000 R09: 0000000000000000
[177319.197773] R10: 0000000000000000 R11: 0000000000000216 R12: 000000c0000ca240
[177319.197774] R13: 0000000000000000 R14: 000000c0000a28c0 R15: 07ffffffffffffff
[177319.197777]  </TASK>

[230724.197402] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230777.595637] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230777.595764] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230784.210701] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230784.210936] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230797.578002] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230797.578916] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230797.578998] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230801.538405] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230801.541827] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230801.542235] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230806.658285] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230806.658417] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230864.578949] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230864.579676] VFS: Lookup of 'diff' in fuse fuse would have caused loop

sorry I have limited understanding around these - but is it a right thing to do i.e binding between two FUSE (FUSE RAFS & FUSE store) mounts?

mount info -

nydusstore on /home/machine/git_projects/nydus-storage-plugin/temp/store type fuse.rawBridge (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000,allow_other,max_read=131072)

rafs on /home/machine/git_projects/nydus-storage-plugin/temp/snapshots/bG9jYWxob3N0OjUwMDAvaGVsbG8td29ybGQ6bnlkdXMtMi4zLjk=/mnt type fuse (ro,nosuid,nodev,noatime,user_id=1000,group_id=1000,default_permissions,allow_other,max_read=1052672)

fatelei · 2025-12-14T06:32:05Z

was trying to run these changes locally with podman 4.9 and nydus 2.3.9 -

seems there is Loop between store/snapshotID/layerDigest/diff and rafs/snapshotId/mnt as stat command on /diff throw error Too many levels of symbolic links.

logs from sudo dmesg -w -

[177319.197683] INFO: task nydus-store:346306 blocked for more than 368 seconds.
[177319.197684]       Tainted: G           OE      6.8.0-88-generic #89-Ubuntu
[177319.197686] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[177319.197687] task:nydus-store    state:D stack:0     pid:346306 tgid:345647 ppid:291011 flags:0x00000002
[177319.197689] Call Trace:
[177319.197690]  <TASK>
[177319.197691]  __schedule+0x27c/0x6b0
[177319.197695]  schedule+0x33/0x110
[177319.197698]  d_alloc_parallel+0x30e/0x3e0
[177319.197701]  ? __pfx_default_wake_function+0x10/0x10
[177319.197704]  __lookup_slow+0x5c/0x130
[177319.197707]  walk_component+0x117/0x190
[177319.197710]  path_lookupat+0x6a/0x1b0
[177319.197713]  filename_lookup+0xe4/0x200
[177319.197718]  vfs_statx+0x95/0x1d0
[177319.197721]  vfs_fstatat+0xaa/0xe0
[177319.197723]  __do_sys_newfstatat+0x44/0x90
[177319.197727]  __x64_sys_newfstatat+0x1c/0x30
[177319.197730]  x64_sys_call+0x2505/0x25a0
[177319.197731]  do_syscall_64+0x7f/0x180
[177319.197734]  ? update_load_avg+0x82/0x850
[177319.197737]  ? update_load_avg+0x82/0x850
[177319.197739]  ? set_next_entity+0xd7/0x1a0
[177319.197741]  ? pick_next_task_fair+0x367/0x620
[177319.197744]  ? os_xsave+0x2e/0x70
[177319.197748]  ? rseq_get_rseq_cs+0x22/0x280
[177319.197751]  ? rseq_ip_fixup+0x90/0x1f0
[177319.197753]  ? restore_fpregs_from_fpstate+0x3d/0xd0
[177319.197756]  ? switch_fpu_return+0x55/0xf0
[177319.197757]  ? arch_exit_to_user_mode_prepare.isra.0+0x95/0xe0
[177319.197759]  ? irqentry_exit_to_user_mode+0x38/0x1e0
[177319.197761]  ? irqentry_exit+0x43/0x50
[177319.197763]  entry_SYSCALL_64_after_hwframe+0x78/0x80
[177319.197765] RIP: 0033:0x407d2e
[177319.197768] RSP: 002b:000000c0003e4c80 EFLAGS: 00000216 ORIG_RAX: 0000000000000106
[177319.197770] RAX: ffffffffffffffda RBX: ffffffffffffff9c RCX: 0000000000407d2e
[177319.197771] RDX: 000000c0005dec68 RSI: 000000c0000ca240 RDI: ffffffffffffff9c
[177319.197772] RBP: 000000c0003e4cc0 R08: 0000000000000000 R09: 0000000000000000
[177319.197773] R10: 0000000000000000 R11: 0000000000000216 R12: 000000c0000ca240
[177319.197774] R13: 0000000000000000 R14: 000000c0000a28c0 R15: 07ffffffffffffff
[177319.197777]  </TASK>

[230724.197402] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230777.595637] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230777.595764] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230784.210701] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230784.210936] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230797.578002] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230797.578916] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230797.578998] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230801.538405] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230801.541827] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230801.542235] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230806.658285] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230806.658417] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230864.578949] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230864.579676] VFS: Lookup of 'diff' in fuse fuse would have caused loop

sorry I have limited understanding around these - but is it a right thing to do i.e binding between two FUSE (FUSE RAFS & FUSE store) mounts?

mount info -

nydusstore on /home/machine/git_projects/nydus-storage-plugin/temp/store type fuse.rawBridge (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000,allow_other,max_read=131072)

rafs on /home/machine/git_projects/nydus-storage-plugin/temp/snapshots/bG9jYWxob3N0OjUwMDAvaGVsbG8td29ybGQ6bnlkdXMtMi4zLjk=/mnt type fuse (ro,nosuid,nodev,noatime,user_id=1000,group_id=1000,default_permissions,allow_other,max_read=1052672)

i will dig the error

nibble0x2 · 2025-12-14T14:56:46Z

was trying to run these changes locally with podman 4.9 and nydus 2.3.9 -
seems there is Loop between store/snapshotID/layerDigest/diff and rafs/snapshotId/mnt as stat command on /diff throw error Too many levels of symbolic links.
logs from sudo dmesg -w -

[177319.197683] INFO: task nydus-store:346306 blocked for more than 368 seconds.
[177319.197684]       Tainted: G           OE      6.8.0-88-generic #89-Ubuntu
[177319.197686] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[177319.197687] task:nydus-store    state:D stack:0     pid:346306 tgid:345647 ppid:291011 flags:0x00000002
[177319.197689] Call Trace:
[177319.197690]  <TASK>
[177319.197691]  __schedule+0x27c/0x6b0
[177319.197695]  schedule+0x33/0x110
[177319.197698]  d_alloc_parallel+0x30e/0x3e0
[177319.197701]  ? __pfx_default_wake_function+0x10/0x10
[177319.197704]  __lookup_slow+0x5c/0x130
[177319.197707]  walk_component+0x117/0x190
[177319.197710]  path_lookupat+0x6a/0x1b0
[177319.197713]  filename_lookup+0xe4/0x200
[177319.197718]  vfs_statx+0x95/0x1d0
[177319.197721]  vfs_fstatat+0xaa/0xe0
[177319.197723]  __do_sys_newfstatat+0x44/0x90
[177319.197727]  __x64_sys_newfstatat+0x1c/0x30
[177319.197730]  x64_sys_call+0x2505/0x25a0
[177319.197731]  do_syscall_64+0x7f/0x180
[177319.197734]  ? update_load_avg+0x82/0x850
[177319.197737]  ? update_load_avg+0x82/0x850
[177319.197739]  ? set_next_entity+0xd7/0x1a0
[177319.197741]  ? pick_next_task_fair+0x367/0x620
[177319.197744]  ? os_xsave+0x2e/0x70
[177319.197748]  ? rseq_get_rseq_cs+0x22/0x280
[177319.197751]  ? rseq_ip_fixup+0x90/0x1f0
[177319.197753]  ? restore_fpregs_from_fpstate+0x3d/0xd0
[177319.197756]  ? switch_fpu_return+0x55/0xf0
[177319.197757]  ? arch_exit_to_user_mode_prepare.isra.0+0x95/0xe0
[177319.197759]  ? irqentry_exit_to_user_mode+0x38/0x1e0
[177319.197761]  ? irqentry_exit+0x43/0x50
[177319.197763]  entry_SYSCALL_64_after_hwframe+0x78/0x80
[177319.197765] RIP: 0033:0x407d2e
[177319.197768] RSP: 002b:000000c0003e4c80 EFLAGS: 00000216 ORIG_RAX: 0000000000000106
[177319.197770] RAX: ffffffffffffffda RBX: ffffffffffffff9c RCX: 0000000000407d2e
[177319.197771] RDX: 000000c0005dec68 RSI: 000000c0000ca240 RDI: ffffffffffffff9c
[177319.197772] RBP: 000000c0003e4cc0 R08: 0000000000000000 R09: 0000000000000000
[177319.197773] R10: 0000000000000000 R11: 0000000000000216 R12: 000000c0000ca240
[177319.197774] R13: 0000000000000000 R14: 000000c0000a28c0 R15: 07ffffffffffffff
[177319.197777]  </TASK>

[230724.197402] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230777.595637] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230777.595764] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230784.210701] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230784.210936] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230797.578002] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230797.578916] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230797.578998] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230801.538405] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230801.541827] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230801.542235] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230806.658285] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230806.658417] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230864.578949] VFS: Lookup of 'diff' in fuse fuse would have caused loop
[230864.579676] VFS: Lookup of 'diff' in fuse fuse would have caused loop

sorry I have limited understanding around these - but is it a right thing to do i.e binding between two FUSE (FUSE RAFS & FUSE store) mounts?
mount info -

nydusstore on /home/machine/git_projects/nydus-storage-plugin/temp/store type fuse.rawBridge (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000,allow_other,max_read=131072)

rafs on /home/machine/git_projects/nydus-storage-plugin/temp/snapshots/bG9jYWxob3N0OjUwMDAvaGVsbG8td29ybGQ6bnlkdXMtMi4zLjk=/mnt type fuse (ro,nosuid,nodev,noatime,user_id=1000,group_id=1000,default_permissions,allow_other,max_read=1052672)

i will dig the error

Thanks! let me know if you are not able to reproduce it...

fatelei force-pushed the diff1 branch from 5b94a42 to 0affa4a Compare October 26, 2025 14:57

fatelei added 7 commits October 28, 2025 11:18

fix: fix read diff1 directory

e8df599

Signed-off-by: fatelei <[email protected]>

fix: fix when mount nydus layer failed not return error

2b070b1

Signed-off-by: fatelei <[email protected]>

fix: fix nil

cef0ca7

Signed-off-by: fatelei <[email protected]>

refactor: refactor this plugin

638e178

Signed-off-by: fatelei <[email protected]>

chore: upgrade go version

eda3a1a

Signed-off-by: fatelei <[email protected]>

fix: fix lint error

956d9db

Signed-off-by: fatelei <[email protected]>

fatelei force-pushed the diff1 branch from 18943fe to 956d9db Compare October 28, 2025 03:18

fatelei added 16 commits December 15, 2025 12:20

fix: fix mount fuse

e5bf029

fix: fix log

742de0e

fix: fix readdir

be79ae5

fix: fix layer inspect

51f3baf

chore: add debug log

1295bee

chore: debug me

d2d51de

chore: debug me

98ad75d

chore: debug me

4279737

chore: debug me

1269170

chore: debug me

70f9150

chore: debug me

0e48b71

chore: debug me

79116e1

chore: debug me

f698e4f

chore: debug me

24d6cf3

chore: add missing file

81cd4af

chore: debug me

3d8580d

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