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2a3dcbccd6
linux/fs
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Tyler Hicks 2a3dcbccd6 9p: Fix refcounting during full path walks for fid lookups 
Decrement the refcount of the parent dentry's fid after walking
each path component during a full path walk for a lookup. Failure to do
so can lead to fids that are not clunked until the filesystem is
unmounted, as indicated by this warning:

 9pnet: found fid 3 not clunked

The improper refcounting after walking resulted in open(2) returning
-EIO on any directories underneath the mount point when using the virtio
transport. When using the fd transport, there's no apparent issue until
the filesytem is unmounted and the warning above is emitted to the logs.

In some cases, the user may not yet be attached to the filesystem and a
new root fid, associated with the user, is created and attached to the
root dentry before the full path walk is performed. Increment the new
root fid's refcount to two in that situation so that it can be safely
decremented to one after it is used for the walk operation. The new fid
will still be attached to the root dentry when
v9fs_fid_lookup_with_uid() returns so a final refcount of one is
correct/expected.

Link: https://lkml.kernel.org/r/20220527000003.355812-2-tyhicks@linux.microsoft.com
Link: https://lkml.kernel.org/r/20220612085330.1451496-4-asmadeus@codewreck.org
Fixes: 6636b6dcc3 ("9p: add refcount to p9_fid struct")
Cc: stable@vger.kernel.org
Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Reviewed-by: Christian Schoenebeck <linux_oss@crudebyte.com>
[Dominique: fix clunking fid multiple times discussed in second link]
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
2022-06-15 12:05:33 +09:00
..
9p 9p: Fix refcounting during full path walks for fid lookups 2022-06-15 12:05:33 +09:00
adfs fs: Convert block_read_full_page() to block_read_full_folio() 2022-05-09 16:21:44 -04:00
affs affs: Convert affs to read_folio 2022-05-09 16:21:44 -04:00
afs netfs: Rename the netfs_io_request cleanup op and give it an op pointer 2022-06-10 20:55:21 +01:00
autofs
befs befs: Convert befs to read_folio 2022-05-09 16:21:45 -04:00
bfs fs: Convert block_read_full_page() to block_read_full_folio() 2022-05-09 16:21:44 -04:00
btrfs Page cache changes for 5.19 2022-05-24 19:55:07 -07:00
cachefiles cachefiles: add tracepoints for on-demand read mode 2022-05-18 00:11:18 +08:00
ceph netfs: Rename the netfs_io_request cleanup op and give it an op pointer 2022-06-10 20:55:21 +01:00
cifs 3 smb3 reconnect fixes 2022-06-12 11:05:44 -07:00
coda coda: Convert coda to read_folio 2022-05-09 16:21:45 -04:00
configfs configfs: fix a race in configfs_{,un}register_subsystem() 2022-02-22 18:30:28 +01:00
cramfs cramfs: Convert cramfs to read_folio 2022-05-09 16:21:45 -04:00
crypto fscrypt: add new helper functions for test_dummy_encryption 2022-05-09 16:18:54 -07:00
debugfs debugfs: Document that debugfs_create functions need not be error checked 2022-02-25 11:56:13 +01:00
devpts fsnotify: fix fsnotify hooks in pseudo filesystems 2022-01-24 14:17:02 +01:00
dlm dlm: use kref_put_lock in __put_lkb 2022-05-02 11:23:49 -05:00
ecryptfs ecryptfs: Convert ecryptfs to read_folio 2022-05-09 16:21:45 -04:00
efivarfs
efs efs: Convert efs symlinks to read_folio 2022-05-09 16:21:45 -04:00
erofs Changes since last update: 2022-06-01 11:54:29 -07:00
exfat Page cache changes for 5.19 2022-05-24 19:55:07 -07:00
exportfs exportfs: support idmapped mounts 2022-04-28 16:31:10 +02:00
ext2 fs: Fix syntax errors in comments 2022-06-06 09:53:03 +02:00
ext4 Page cache changes for 5.19 2022-05-24 19:55:07 -07:00
f2fs f2fs-for-5.19 2022-05-31 16:52:59 -07:00
fat Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
freevxfs SPDX changes for 5.19-rc1 2022-06-03 10:34:34 -07:00
fscache fscache: remove FSCACHE_OLD_API Kconfig option 2022-04-08 23:54:37 +01:00
fuse libnvdimm for 5.19 2022-05-27 15:49:30 -07:00
gfs2 Page cache changes for 5.19 2022-05-24 19:55:07 -07:00
hfs fs: Change try_to_free_buffers() to take a folio 2022-05-09 23:12:34 -04:00
hfsplus fs: Change try_to_free_buffers() to take a folio 2022-05-09 23:12:34 -04:00
hostfs hostfs: Convert hostfs to read_folio 2022-05-09 16:21:45 -04:00
hpfs hpfs: Convert symlinks to read_folio 2022-05-09 16:21:45 -04:00
hugetlbfs powerpc updates for 5.19 2022-05-28 11:27:17 -07:00
iomap Page cache changes for 5.19 2022-05-24 19:55:07 -07:00
isofs isofs: Convert symlinks and zisofs to read_folio 2022-05-09 16:21:45 -04:00
jbd2 Page cache changes for 5.19 2022-05-24 19:55:07 -07:00
jffs2 This pull request contains fixes for JFFS2, UBI and UBIFS 2022-06-03 14:42:24 -07:00
jfs JFS: One bug fix and some code cleanup 2022-05-27 15:59:21 -07:00
kernfs kernfs: Separate kernfs_pr_cont_buf and rename_lock. 2022-05-19 19:37:06 +02:00
ksmbd ksmbd: smbd: relax the count of sges required 2022-05-27 21:31:20 -05:00
lockd NFSD: Move svc_serv_ops::svo_function into struct svc_serv 2022-02-28 10:26:40 -05:00
minix fs: Convert block_read_full_page() to block_read_full_folio() 2022-05-09 16:21:44 -04:00
netfs netfs: Rename the netfs_io_request cleanup op and give it an op pointer 2022-06-10 20:55:21 +01:00
nfs Cleanups (and one fix) around struct mount handling. 2022-06-04 19:00:05 -07:00
nfs_common
nfsd Notable changes: 2022-06-10 17:28:43 -07:00
nilfs2 Page cache changes for 5.19 2022-05-24 19:55:07 -07:00
nls
notify \n 2022-05-25 19:29:54 -07:00
ntfs Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
ntfs3 Ntfs3 for 5.19 2022-06-03 16:57:16 -07:00
ocfs2 Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
omfs fs: Convert block_read_full_page() to block_read_full_folio() 2022-05-09 16:21:44 -04:00
openpromfs fs: allocate inode by using alloc_inode_sb() 2022-03-22 15:57:03 -07:00
orangefs orangefs: Convert to free_folio 2022-05-09 23:12:53 -04:00
overlayfs overlayfs update for 5.19 2022-05-30 11:19:16 -07:00
proc Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
pstore pstore: Don't use semaphores in always-atomic-context code 2022-03-15 11:08:23 -07:00
qnx4 fs: Convert block_read_full_page() to block_read_full_folio() 2022-05-09 16:21:44 -04:00
qnx6 fs: Convert mpage_readpage to mpage_read_folio 2022-05-09 16:21:44 -04:00
quota quota: Prevent memory allocation recursion while holding dq_lock 2022-06-06 10:08:10 +02:00
ramfs Merge branch 'akpm' (patches from Andrew) 2021-11-09 10:11:53 -08:00
reiserfs fs: Change try_to_free_buffers() to take a folio 2022-05-09 23:12:34 -04:00
romfs romfs: Convert romfs to read_folio 2022-05-09 16:21:46 -04:00
smbfs_common Add various fsctl structs 2022-05-23 20:24:12 -05:00
squashfs Page cache changes for 5.19 2022-05-24 19:55:07 -07:00
sysfs kobject: kobj_type: remove default_attrs 2022-04-05 15:39:19 +02:00
sysv Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
tracefs tracefs: Set the group ownership in apply_options() not parse_options() 2022-02-25 21:05:04 -05:00
ubifs This pull request contains fixes for JFFS2, UBI and UBIFS 2022-06-03 14:42:24 -07:00
udf Page cache changes for 5.19 2022-05-24 19:55:07 -07:00
ufs fs: Convert block_read_full_page() to block_read_full_folio() 2022-05-09 16:21:44 -04:00
unicode kbuild: unify cmd_copy and cmd_shipped 2022-02-14 10:37:32 +09:00
vboxsf vboxsf: Convert vboxsf to read_folio 2022-05-09 16:21:46 -04:00
verity Page cache changes for 5.19 2022-05-24 19:55:07 -07:00
xfs xfs: Changes for 5.19-rc1 [2nd set] 2022-06-01 17:23:53 -07:00
zonefs zonefs: fix zonefs_iomap_begin() for reads 2022-06-08 19:13:55 +09:00
aio.c Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2022-04-01 19:57:03 -07:00
anon_inodes.c
attr.c fs: handle circular mappings correctly 2021-11-17 09:26:09 +01:00
bad_inode.c
binfmt_aout.c
binfmt_elf_fdpic.c coredump: Snapshot the vmas in do_coredump 2022-03-08 12:55:29 -06:00
binfmt_elf_test.c binfmt_elf: Introduce KUnit test 2022-03-03 20:38:56 -08:00
binfmt_elf.c revert "fs/binfmt_elf: use PT_LOAD p_align values for static PIE" 2022-04-15 14:49:56 -07:00
binfmt_flat.c binfmt_flat: Remove shared library support 2022-04-22 10:57:18 -07:00
binfmt_misc.c Fix regression due to "fs: move binfmt_misc sysctl to its own file" 2022-02-09 09:50:02 -08:00
binfmt_script.c
buffer.c fs: Convert drop_buffers() to use a folio 2022-05-09 23:12:34 -04:00
char_dev.c
compat_binfmt_elf.c binfmt_elf: Introduce KUnit test 2022-03-03 20:38:56 -08:00
coredump.c ptrace: Cleanups for v5.18 2022-03-28 17:29:53 -07:00
d_path.c d_path: fix Kernel doc validator complaining 2021-11-06 13:30:32 -07:00
dax.c libnvdimm for 5.19 2022-05-27 15:49:30 -07:00
dcache.c mm: dcache: use kmem_cache_alloc_lru() to allocate dentry 2022-03-22 15:57:03 -07:00
direct-io.c direct-io: remove random prefetches 2022-04-17 19:50:02 -06:00
drop_caches.c
eventfd.c
eventpoll.c eventpoll: simplify sysctl declaration with register_sysctl() 2022-01-22 08:33:35 +02:00
exec.c This set of changes updates init and user mode helper tasks to be 2022-06-03 16:03:05 -07:00
fcntl.c VFS: add FMODE_CAN_ODIRECT file flag 2022-05-09 18:20:49 -07:00
fhandle.c
file_table.c Descriptor handling cleanups 2022-06-04 18:52:00 -07:00
file.c fix the breakage in close_fd_get_file() calling conventions change 2022-06-05 15:03:03 -04:00
filesystems.c
fs_context.c vfs: fs_context: fix up param length parsing in legacy_parse_param 2022-01-18 09:23:19 +02:00
fs_parser.c fs_parse: allow parameter value to be empty 2021-12-09 14:09:36 -05:00
fs_pin.c
fs_struct.c
fs_types.c
fs-writeback.c writeback: Fix inode->i_io_list not be protected by inode->i_lock error 2022-06-06 09:54:30 +02:00
fsopen.c uninline may_mount() and don't opencode it in fspick(2)/fsopen(2) 2022-05-19 23:25:10 -04:00
init.c
inode.c writeback: Fix inode->i_io_list not be protected by inode->i_lock error 2022-06-06 09:54:30 +02:00
internal.h Cleanups (and one fix) around struct mount handling. 2022-06-04 19:00:05 -07:00
io_uring.c fix for breakage in #work.fd this window 2022-06-05 17:14:03 -07:00
io-wq.c io-wq: use __set_notify_signal() to wake workers 2022-04-30 08:39:54 -06:00
io-wq.h io_uring: add support for IORING_ASYNC_CANCEL_ALL 2022-04-24 18:18:18 -06:00
ioctl.c Fixes for 5.18-rc1: 2022-04-01 19:35:56 -07:00
Kconfig mm: hugetlb_vmemmap: cleanup CONFIG_HUGETLB_PAGE_FREE_VMEMMAP* 2022-04-28 23:16:15 -07:00
Kconfig.binfmt m68knommu: changes for linux 5.19 2022-05-30 10:56:18 -07:00
kernel_read_file.c
libfs.c fs: Convert simple_readpage to simple_read_folio 2022-05-09 16:21:44 -04:00
locks.c fs/lock: add 2 callbacks to lock_manager_operations to resolve conflict 2022-05-19 12:25:39 -04:00
Makefile Fix from Christoph Hellwig merging the CONFIG_UNICODE_UTF8_DATA into the 2022-02-01 11:13:24 -08:00
mbcache.c
mount.h
mpage.c fs: Change try_to_free_buffers() to take a folio 2022-05-09 23:12:34 -04:00
namei.c Several cleanups in fs/namei.c. 2022-06-04 19:07:15 -07:00
namespace.c Cleanups (and one fix) around struct mount handling. 2022-06-04 19:00:05 -07:00
no-block.c
nsfs.c
open.c RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
pipe.c Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
pnode.c
pnode.h
posix_acl.c fs: fix acl translation 2022-04-19 10:19:02 -07:00
proc_namespace.c fs: add is_idmapped_mnt() helper 2021-12-03 18:44:06 +01:00
read_write.c riscv: compat: syscall: Add compat_sys_call_table implementation 2022-04-26 13:36:25 -07:00
readdir.c
remap_range.c Filesystem folio changes for 5.18 2022-03-22 18:26:56 -07:00
select.c select: Fix indefinitely sleeping task in poll_schedule_timeout() 2022-01-11 09:03:05 -08:00
seq_file.c rxrpc: Fix locking issue 2022-05-22 21:03:01 +01:00
signalfd.c Merge branch 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2022-01-17 05:49:30 +02:00
splice.c mm: Convert remove_mapping() to take a folio 2022-03-21 12:59:01 -04:00
stack.c
stat.c RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
statfs.c
super.c block: add a bdev_stable_writes helper 2022-04-17 19:49:59 -06:00
sync.c riscv: compat: syscall: Add compat_sys_call_table implementation 2022-04-26 13:36:25 -07:00
sysctls.c fs: move namespace sysctls and declare fs base directory 2022-01-22 08:33:36 +02:00
timerfd.c
userfaultfd.c mm/uffd: enable write protection for shmem & hugetlbfs 2022-05-13 07:20:11 -07:00
utimes.c
xattr.c fs: split off do_getxattr from getxattr 2022-04-24 18:18:37 -06:00