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2022-02-22configfs: fix a race in configfs_{,un}register_subsystem()ChenXiaoSong1-0/+14
When configfs_register_subsystem() or configfs_unregister_subsystem() is executing link_group() or unlink_group(), it is possible that two processes add or delete list concurrently. Some unfortunate interleavings of them can cause kernel panic. One of cases is: A --> B --> C --> D A <-- B <-- C <-- D delete list_head *B | delete list_head *C --------------------------------|----------------------------------- configfs_unregister_subsystem | configfs_unregister_subsystem unlink_group | unlink_group unlink_obj | unlink_obj list_del_init | list_del_init __list_del_entry | __list_del_entry __list_del | __list_del // next == C | next->prev = prev | | next->prev = prev prev->next = next | | // prev == B | prev->next = next Fix this by adding mutex when calling link_group() or unlink_group(), but parent configfs_subsystem is NULL when config_item is root. So I create a mutex configfs_subsystem_mutex. Fixes: 7063fbf22611 ("[PATCH] configfs: User-driven configuration filesystem") Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com> Signed-off-by: Laibin Qiu <qiulaibin@huawei.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
2022-01-24fsnotify: fix fsnotify hooks in pseudo filesystemsAmir Goldstein1-3/+3
Commit 49246466a989 ("fsnotify: move fsnotify_nameremove() hook out of d_delete()") moved the fsnotify delete hook before d_delete() so fsnotify will have access to a positive dentry. This allowed a race where opening the deleted file via cached dentry is now possible after receiving the IN_DELETE event. To fix the regression in pseudo filesystems, convert d_delete() calls to d_drop() (see commit 46c46f8df9aa ("devpts_pty_kill(): don't bother with d_delete()") and move the fsnotify hook after d_drop(). Add a missing fsnotify_unlink() hook in nfsdfs that was found during the audit of fsnotify hooks in pseudo filesystems. Note that the fsnotify hooks in simple_recursive_removal() follow d_invalidate(), so they require no change. Link: https://lore.kernel.org/r/20220120215305.282577-2-amir73il@gmail.com Reported-by: Ivan Delalande <colona@arista.com> Link: https://lore.kernel.org/linux-fsdevel/YeNyzoDM5hP5LtGW@visor/ Fixes: 49246466a989 ("fsnotify: move fsnotify_nameremove() hook out of d_delete()") Cc: stable@vger.kernel.org # v5.3+ Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
2021-08-25configfs: fix a race in configfs_lookup()Sishuai Gong1-3/+4
When configfs_lookup() is executing list_for_each_entry(), it is possible that configfs_dir_lseek() is calling list_del(). Some unfortunate interleavings of them can cause a kernel NULL pointer dereference error Thread 1 Thread 2 //configfs_dir_lseek() //configfs_lookup() list_del(&cursor->s_sibling); list_for_each_entry(sd, ...) Fix this by grabbing configfs_dirent_lock in configfs_lookup() while iterating ->s_children. Signed-off-by: Sishuai Gong <sishuai@purdue.edu> Signed-off-by: Christoph Hellwig <hch@lst.de>
2021-08-25configfs: fold configfs_attach_attr into configfs_lookupChristoph Hellwig1-49/+24
This makes it more clear what gets added to the dcache and prepares for an additional locking fix. Signed-off-by: Christoph Hellwig <hch@lst.de>
2021-08-25configfs: simplify the configfs_dirent_is_readyChristoph Hellwig1-3/+1
Return the error directly instead of using a goto. Signed-off-by: Christoph Hellwig <hch@lst.de>
2021-08-25configfs: return -ENAMETOOLONG earlier in configfs_lookupChristoph Hellwig1-2/+3
Just like most other file systems: get the simple checks out of the way first. Signed-off-by: Christoph Hellwig <hch@lst.de>
2021-08-09configfs: restore the kernel v5.13 text attribute write behaviorBart Van Assche1-12/+6
Instead of appending new text attribute data at the offset specified by the write() system call, only pass the newly written data to the .store() callback. Reported-by: Bodo Stroesser <bostroesser@gmail.com> Tested-by: Bodo Stroesser <bostroesser@gmail.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Christoph Hellwig <hch@lst.de>
2021-07-13configfs: fix the read and write iteratorsBart Van Assche1-7/+22
Commit 7fe1e79b59ba ("configfs: implement the .read_iter and .write_iter methods") changed the simple_read_from_buffer() calls into copy_to_iter() calls and the simple_write_to_buffer() calls into copy_from_iter() calls. The simple*buffer() methods update the file offset (*ppos) but the read and write iterators not yet. Make the read and write iterators update the file offset (iocb->ki_pos). This patch has been tested as follows: # modprobe target_core_user # dd if=/sys/kernel/config/target/dbroot bs=1 /var/target 12+0 records in 12+0 records out 12 bytes copied, 9.5539e-05 s, 126 kB/s # cd /sys/kernel/config/acpi/table # mkdir test # cd test # dmesg -c >/dev/null; printf 'SSDT\x8\0\0\0abcdefghijklmnopqrstuvwxyz' | dd of=aml bs=1; dmesg -c 34+0 records in 34+0 records out 34 bytes copied, 0.010627 s, 3.2 kB/s [ 261.056551] ACPI configfs: invalid table length Reported-by: Yanko Kaneti <yaneti@declera.com> Cc: Yanko Kaneti <yaneti@declera.com> Fixes: 7fe1e79b59ba ("configfs: implement the .read_iter and .write_iter methods") Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Christoph Hellwig <hch@lst.de>
2021-07-02Merge tag 'configfs-5.13' of git://git.infradead.org/users/hch/configfsLinus Torvalds1-130/+51
Pull configfs updates from Christoph Hellwig: - fix a memleak in configfs_release_bin_file (Chung-Chiang Cheng) - implement the .read_iter and .write_iter (Bart Van Assche) - minor cleanups (Bart Van Assche, me) * tag 'configfs-5.13' of git://git.infradead.org/users/hch/configfs: configfs: simplify configfs_release_bin_file configfs: fix memleak in configfs_release_bin_file configfs: implement the .read_iter and .write_iter methods configfs: drop pointless kerneldoc comments configfs: fix the kerneldoc comment for configfs_create_bin_file
2021-06-29fs: move ramfs_aops to libfsChristoph Hellwig1-7/+1
Move the ramfs aops to libfs and reuse them for kernfs and configfs. Thosw two did not wire up ->set_page_dirty before and now get __set_page_dirty_no_writeback, which is the right one for no-writeback address_space usage. Drop the now unused exports of the libfs helpers only used for ramfs-style pagecache usage. Link: https://lkml.kernel.org/r/20210614061512.3966143-3-hch@lst.de Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-06-22configfs: simplify configfs_release_bin_fileChristoph Hellwig1-6/+0
Remove the clearing of various fields just before freeing the buffer structure. Signed-off-by: Christoph Hellwig <hch@lst.de>
2021-06-22configfs: fix memleak in configfs_release_bin_fileChung-Chiang Cheng1-5/+5
When reading binary attributes in progress, buffer->bin_buffer is setup in configfs_read_bin_file() but never freed. Fixes: 03607ace807b4 ("configfs: implement binary attributes") Signed-off-by: Chung-Chiang Cheng <cccheng@synology.com> [hch: move the vfree rather than duplicating it] Signed-off-by: Christoph Hellwig <hch@lst.de>
2021-05-25configfs: implement the .read_iter and .write_iter methodsBart Van Assche1-42/+42
Configfs is one of the few filesystems that does not yet support the .read_iter and .write_iter callbacks. This patch adds support for these methods in configfs. Signed-off-by: Bart Van Assche <bvanassche@acm.org> [hch: split out a separate fix] Signed-off-by: Christoph Hellwig <hch@lst.de>
2021-05-25configfs: drop pointless kerneldoc commentsChristoph Hellwig1-79/+6
file.c has a bunch of kerneldoc comments for static functions that do not document any API but just list what is done. Drop them. Signed-off-by: Christoph Hellwig <hch@lst.de>
2021-05-25configfs: fix the kerneldoc comment for configfs_create_bin_fileBart Van Assche1-1/+1
Mention the correct argument name. Signed-off-by: Bart Van Assche <bvanassche@acm.org> [hch: split from a larger patch] Signed-off-by: Christoph Hellwig <hch@lst.de>
2021-05-07treewide: remove editor modelines and cruftMasahiro Yamada7-21/+7
The section "19) Editor modelines and other cruft" in Documentation/process/coding-style.rst clearly says, "Do not include any of these in source files." I recently receive a patch to explicitly add a new one. Let's do treewide cleanups, otherwise some people follow the existing code and attempt to upstream their favoriate editor setups. It is even nicer if scripts/checkpatch.pl can check it. If we like to impose coding style in an editor-independent manner, I think editorconfig (patch [1]) is a saner solution. [1] https://lore.kernel.org/lkml/20200703073143.423557-1-danny@kdrag0n.dev/ Link: https://lkml.kernel.org/r/20210324054457.1477489-1-masahiroy@kernel.org Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Miguel Ojeda <ojeda@kernel.org> [auxdisplay] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-03-11configfs: fix a use-after-free in __configfs_open_fileDaiyue Zhang1-4/+2
Commit b0841eefd969 ("configfs: provide exclusion between IO and removals") uses ->frag_dead to mark the fragment state, thus no bothering with extra refcount on config_item when opening a file. The configfs_get_config_item was removed in __configfs_open_file, but not with config_item_put. So the refcount on config_item will lost its balance, causing use-after-free issues in some occasions like this: Test: 1. Mount configfs on /config with read-only items: drwxrwx--- 289 root root 0 2021-04-01 11:55 /config drwxr-xr-x 2 root root 0 2021-04-01 11:54 /config/a --w--w--w- 1 root root 4096 2021-04-01 11:53 /config/a/1.txt ...... 2. Then run: for file in /config do echo $file grep -R 'key' $file done 3. __configfs_open_file will be called in parallel, the first one got called will do: if (file->f_mode & FMODE_READ) { if (!(inode->i_mode & S_IRUGO)) goto out_put_module; config_item_put(buffer->item); kref_put() package_details_release() kfree() the other one will run into use-after-free issues like this: BUG: KASAN: use-after-free in __configfs_open_file+0x1bc/0x3b0 Read of size 8 at addr fffffff155f02480 by task grep/13096 CPU: 0 PID: 13096 Comm: grep VIP: 00 Tainted: G W 4.14.116-kasan #1 TGID: 13096 Comm: grep Call trace: dump_stack+0x118/0x160 kasan_report+0x22c/0x294 __asan_load8+0x80/0x88 __configfs_open_file+0x1bc/0x3b0 configfs_open_file+0x28/0x34 do_dentry_open+0x2cc/0x5c0 vfs_open+0x80/0xe0 path_openat+0xd8c/0x2988 do_filp_open+0x1c4/0x2fc do_sys_open+0x23c/0x404 SyS_openat+0x38/0x48 Allocated by task 2138: kasan_kmalloc+0xe0/0x1ac kmem_cache_alloc_trace+0x334/0x394 packages_make_item+0x4c/0x180 configfs_mkdir+0x358/0x740 vfs_mkdir2+0x1bc/0x2e8 SyS_mkdirat+0x154/0x23c el0_svc_naked+0x34/0x38 Freed by task 13096: kasan_slab_free+0xb8/0x194 kfree+0x13c/0x910 package_details_release+0x524/0x56c kref_put+0xc4/0x104 config_item_put+0x24/0x34 __configfs_open_file+0x35c/0x3b0 configfs_open_file+0x28/0x34 do_dentry_open+0x2cc/0x5c0 vfs_open+0x80/0xe0 path_openat+0xd8c/0x2988 do_filp_open+0x1c4/0x2fc do_sys_open+0x23c/0x404 SyS_openat+0x38/0x48 el0_svc_naked+0x34/0x38 To fix this issue, remove the config_item_put in __configfs_open_file to balance the refcount of config_item. Fixes: b0841eefd969 ("configfs: provide exclusion between IO and removals") Signed-off-by: Daiyue Zhang <zhangdaiyue1@huawei.com> Signed-off-by: Yi Chen <chenyi77@huawei.com> Signed-off-by: Ge Qiu <qiuge@huawei.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Christoph Hellwig <hch@lst.de>
2021-01-24fs: make helpers idmap mount awareChristian Brauner4-6/+11
Extend some inode methods with an additional user namespace argument. A filesystem that is aware of idmapped mounts will receive the user namespace the mount has been marked with. This can be used for additional permission checking and also to enable filesystems to translate between uids and gids if they need to. We have implemented all relevant helpers in earlier patches. As requested we simply extend the exisiting inode method instead of introducing new ones. This is a little more code churn but it's mostly mechanical and doesnt't leave us with additional inode methods. Link: https://lore.kernel.org/r/20210121131959.646623-25-christian.brauner@ubuntu.com Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
2021-01-24namei: make permission helpers idmapped mount awareChristian Brauner1-1/+2
The two helpers inode_permission() and generic_permission() are used by the vfs to perform basic permission checking by verifying that the caller is privileged over an inode. In order to handle idmapped mounts we extend the two helpers with an additional user namespace argument. On idmapped mounts the two helpers will make sure to map the inode according to the mount's user namespace and then peform identical permission checks to inode_permission() and generic_permission(). If the initial user namespace is passed nothing changes so non-idmapped mounts will see identical behavior as before. Link: https://lore.kernel.org/r/20210121131959.646623-6-christian.brauner@ubuntu.com Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: James Morris <jamorris@linux.microsoft.com> Acked-by: Serge Hallyn <serge@hallyn.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
2020-11-14configfs: fix kernel-doc markup issueAlex Shi1-0/+1
Add explanation for 'frag' parameter to avoid kernel-doc issue: fs/configfs/dir.c:277: warning: Function parameter or member 'frag' not described in 'configfs_create_dir' Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Christoph Hellwig <hch@lst.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Christoph Hellwig <hch@lst.de>
2020-10-16fs: configfs: delete repeated words in commentsRandy Dunlap2-2/+2
Drop duplicated words {the, that} in comments. Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Joel Becker <jlbec@evilplan.org> Cc: Christoph Hellwig <hch@lst.de> Link: https://lkml.kernel.org/r/20200811021826.25032-1-rdunlap@infradead.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-08-23treewide: Use fallthrough pseudo-keywordGustavo A. R. Silva1-2/+2
Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-06-01Merge tag 'docs-5.8' of git://git.lwn.net/linuxLinus Torvalds2-2/+2
Pull documentation updates from Jonathan Corbet: "A fair amount of stuff this time around, dominated by yet another massive set from Mauro toward the completion of the RST conversion. I *really* hope we are getting close to the end of this. Meanwhile, those patches reach pretty far afield to update document references around the tree; there should be no actual code changes there. There will be, alas, more of the usual trivial merge conflicts. Beyond that we have more translations, improvements to the sphinx scripting, a number of additions to the sysctl documentation, and lots of fixes" * tag 'docs-5.8' of git://git.lwn.net/linux: (130 commits) Documentation: fixes to the maintainer-entry-profile template zswap: docs/vm: Fix typo accept_threshold_percent in zswap.rst tracing: Fix events.rst section numbering docs: acpi: fix old http link and improve document format docs: filesystems: add info about efivars content Documentation: LSM: Correct the basic LSM description mailmap: change email for Ricardo Ribalda docs: sysctl/kernel: document unaligned controls Documentation: admin-guide: update bug-hunting.rst docs: sysctl/kernel: document ngroups_max nvdimm: fixes to maintainter-entry-profile Documentation/features: Correct RISC-V kprobes support entry Documentation/features: Refresh the arch support status files Revert "docs: sysctl/kernel: document ngroups_max" docs: move locking-specific documents to locking/ docs: move digsig docs to the security book docs: move the kref doc into the core-api book docs: add IRQ documentation at the core-api book docs: debugging-via-ohci1394.txt: add it to the core-api book docs: fix references for ipmi.rst file ...
2020-05-05docs: filesystems: convert configfs.txt to ReSTMauro Carvalho Chehab2-2/+2
- Add a SPDX header; - Adjust document and section titles; - Use copyright symbol; - Some whitespace fixes and new line breaks; - Mark literal blocks as such; - Add it to filesystems/index.rst. Also, as this file is alone on its own dir, and it doesn't seem too likely that other documents will follow it, let's move it to the filesystems/ root documentation dir. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Link: https://lore.kernel.org/r/c2424ec2ad4d735751434ff7f52144c44aa02d5a.1588021877.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2020-04-27configfs: fix config_item refcnt leak in configfs_rmdir()Xiyu Yang1-0/+1
configfs_rmdir() invokes configfs_get_config_item(), which returns a reference of the specified config_item object to "parent_item" with increased refcnt. When configfs_rmdir() returns, local variable "parent_item" becomes invalid, so the refcount should be decreased to keep refcount balanced. The reference counting issue happens in one exception handling path of configfs_rmdir(). When down_write_killable() fails, the function forgets to decrease the refcnt increased by configfs_get_config_item(), causing a refcnt leak. Fix this issue by calling config_item_put() when down_write_killable() fails. Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn> Signed-off-by: Xin Tan <tanxin.ctf@gmail.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-12-08utimes: Clamp the timestamps in notify_change()Amir Goldstein1-6/+3
Push clamping timestamps into notify_change(), so in-kernel callers like nfsd and overlayfs will get similar timestamp set behavior as utimes. AV: get rid of clamping in ->setattr() instances; we don't need to bother with that there, with notify_change() doing normalization in all cases now (it already did for implicit case, since current_time() clamps). Suggested-by: Miklos Szeredi <mszeredi@redhat.com> Fixes: 42e729b9ddbb ("utimes: Clamp the timestamps before update") Cc: stable@vger.kernel.org # v5.4 Cc: Deepa Dinamani <deepa.kernel@gmail.com> Cc: Jeff Layton <jlayton@kernel.org> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2019-11-06configfs: calculate the depth of parent itemHonggang Li1-1/+1
When create symbolic link, create_link should calculate the depth of the parent item. However, both the first and second parameters of configfs_get_target_path had been set to the target. Broken symbolic link created. $ targetcli ls / o- / ............................................................. [...] o- backstores .................................................. [...] | o- block ...................................... [Storage Objects: 0] | o- fileio ..................................... [Storage Objects: 2] | | o- vdev0 .......... [/dev/ramdisk1 (16.0MiB) write-thru activated] | | | o- alua ....................................... [ALUA Groups: 1] | | | o- default_tg_pt_gp ........... [ALUA state: Active/optimized] | | o- vdev1 .......... [/dev/ramdisk2 (16.0MiB) write-thru activated] | | o- alua ....................................... [ALUA Groups: 1] | | o- default_tg_pt_gp ........... [ALUA state: Active/optimized] | o- pscsi ...................................... [Storage Objects: 0] | o- ramdisk .................................... [Storage Objects: 0] o- iscsi ................................................ [Targets: 0] o- loopback ............................................. [Targets: 0] o- srpt ................................................. [Targets: 2] | o- ib.e89a8f91cb3200000000000000000000 ............... [no-gen-acls] | | o- acls ................................................ [ACLs: 2] | | | o- ib.e89a8f91cb3200000000000000000000 ........ [Mapped LUNs: 2] | | | | o- mapped_lun0 ............................. [BROKEN LUN LINK] | | | | o- mapped_lun1 ............................. [BROKEN LUN LINK] | | | o- ib.e89a8f91cb3300000000000000000000 ........ [Mapped LUNs: 2] | | | o- mapped_lun0 ............................. [BROKEN LUN LINK] | | | o- mapped_lun1 ............................. [BROKEN LUN LINK] | | o- luns ................................................ [LUNs: 2] | | o- lun0 ...... [fileio/vdev0 (/dev/ramdisk1) (default_tg_pt_gp)] | | o- lun1 ...... [fileio/vdev1 (/dev/ramdisk2) (default_tg_pt_gp)] | o- ib.e89a8f91cb3300000000000000000000 ............... [no-gen-acls] | o- acls ................................................ [ACLs: 0] | o- luns ................................................ [LUNs: 0] o- vhost ................................................ [Targets: 0] Fixes: e9c03af21cc7 ("configfs: calculate the symlink target only once") Signed-off-by: Honggang Li <honli@redhat.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-09-19Merge tag 'configfs-for-5.4' of git://git.infradead.org/users/hch/configfsLinus Torvalds5-254/+170
Pull configfs updates from Christoph Hellwig: - fix a symlink deadlock (Al Viro) - various cleanups (Al Viro, me) * tag 'configfs-for-5.4' of git://git.infradead.org/users/hch/configfs: configfs: calculate the symlink target only once configfs: make configfs_create() return inode configfs: factor dirent removal into helpers configfs: fix a deadlock in configfs_symlink()
2019-09-19Merge tag 'y2038-vfs' of ↵Linus Torvalds1-6/+6
git://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground Pull y2038 vfs updates from Arnd Bergmann: "Add inode timestamp clamping. This series from Deepa Dinamani adds a per-superblock minimum/maximum timestamp limit for a file system, and clamps timestamps as they are written, to avoid random behavior from integer overflow as well as having different time stamps on disk vs in memory. At mount time, a warning is now printed for any file system that can represent current timestamps but not future timestamps more than 30 years into the future, similar to the arbitrary 30 year limit that was added to settimeofday(). This was picked as a compromise to warn users to migrate to other file systems (e.g. ext4 instead of ext3) when they need the file system to survive beyond 2038 (or similar limits in other file systems), but not get in the way of normal usage" * tag 'y2038-vfs' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground: ext4: Reduce ext4 timestamp warnings isofs: Initialize filesystem timestamp ranges pstore: fs superblock limits fs: omfs: Initialize filesystem timestamp ranges fs: hpfs: Initialize filesystem timestamp ranges fs: ceph: Initialize filesystem timestamp ranges fs: sysv: Initialize filesystem timestamp ranges fs: affs: Initialize filesystem timestamp ranges fs: fat: Initialize filesystem timestamp ranges fs: cifs: Initialize filesystem timestamp ranges fs: nfs: Initialize filesystem timestamp ranges ext4: Initialize timestamps limits 9p: Fill min and max timestamps in sb fs: Fill in max and min timestamps in superblock utimes: Clamp the timestamps before update mount: Add mount warning for impending timestamp expiry timestamp_truncate: Replace users of timespec64_trunc vfs: Add timestamp_truncate() api vfs: Add file timestamp range support
2019-09-11configfs: calculate the symlink target only onceAl Viro4-171/+73
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-09-11configfs: make configfs_create() return inodeAl Viro3-59/+39
Get rid of the callback, deal with that and dentry in callers Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-09-11configfs: factor dirent removal into helpersChristoph Hellwig1-30/+33
Lots of duplicated code that benefits from a little consolidation. Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-09-11configfs: fix a deadlock in configfs_symlink()Al Viro1-1/+32
Configfs abuses symlink(2). Unlike the normal filesystems, it wants the target resolved at symlink(2) time, like link(2) would've done. The problem is that ->symlink() is called with the parent directory locked exclusive, so resolving the target inside the ->symlink() is easily deadlocked. Short of really ugly games in sys_symlink() itself, all we can do is to unlock the parent before resolving the target and relock it after. However, that invalidates the checks done by the caller of ->symlink(), so we have to * check that dentry is still where it used to be (it couldn't have been moved, but it could've been unhashed) * recheck that it's still negative (somebody else might've successfully created a symlink with the same name while we were looking the target up) * recheck the permissions on the parent directory. Cc: stable@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-09-04configfs: provide exclusion between IO and removalsAl Viro2-18/+80
Make sure that attribute methods are not called after the item has been removed from the tree. To do so, we * at the point of no return in removals, grab ->frag_sem exclusive and mark the fragment dead. * call the methods of attributes with ->frag_sem taken shared and only after having verified that the fragment is still alive. The main benefit is for method instances - they are guaranteed that the objects they are accessing *and* all ancestors are still there. Another win is that we don't need to bother with extra refcount on config_item when opening a file - the item will be alive for as long as it stays in the tree, and we won't touch it/attributes/any associated data after it's been removed from the tree. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-09-02configfs: new object reprsenting tree fragmentsAl Viro3-27/+97
Refcounted, hangs of configfs_dirent, created by operations that add fragments to configfs tree (mkdir and configfs_register_{subsystem,group}). Will be used in the next commit to provide exclusion between fragment removal and ->show/->store calls. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-09-02configfs_register_group() shouldn't be (and isn't) called in rmdirable partsAl Viro1-11/+0
revert cc57c07343bd "configfs: fix registered group removal" It was an attempt to handle something that fundamentally doesn't work - configfs_register_group() should never be done in a part of tree that can be rmdir'ed. And in mainline it never had been, so let's not borrow trouble; the fix was racy anyway, it would take a lot more to make that work and desired semantics is not clear. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-09-02configfs: stash the data we need into configfs_buffer at open timeAl Viro1-134/+95
simplifies the ->read()/->write()/->release() instances nicely Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-08-30timestamp_truncate: Replace users of timespec64_truncDeepa Dinamani1-6/+6
Update the inode timestamp updates to use timestamp_truncate() instead of timespec64_trunc(). The change was mostly generated by the following coccinelle script. virtual context virtual patch @r1 depends on patch forall@ struct inode *inode; identifier i_xtime =~ "^i_[acm]time$"; expression e; @@ inode->i_xtime = - timespec64_trunc( + timestamp_truncate( ..., - e); + inode); Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Jeff Layton <jlayton@kernel.org> Cc: adrian.hunter@intel.com Cc: dedekind1@gmail.com Cc: gregkh@linuxfoundation.org Cc: hch@lst.de Cc: jaegeuk@kernel.org Cc: jlbec@evilplan.org Cc: richard@nod.at Cc: tj@kernel.org Cc: yuchao0@huawei.com Cc: linux-f2fs-devel@lists.sourceforge.net Cc: linux-ntfs-dev@lists.sourceforge.net Cc: linux-mtd@lists.infradead.org
2019-07-19Merge branch 'work.mount0' of ↵Linus Torvalds1-5/+15
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs mount updates from Al Viro: "The first part of mount updates. Convert filesystems to use the new mount API" * 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (63 commits) mnt_init(): call shmem_init() unconditionally constify ksys_mount() string arguments don't bother with registering rootfs init_rootfs(): don't bother with init_ramfs_fs() vfs: Convert smackfs to use the new mount API vfs: Convert selinuxfs to use the new mount API vfs: Convert securityfs to use the new mount API vfs: Convert apparmorfs to use the new mount API vfs: Convert openpromfs to use the new mount API vfs: Convert xenfs to use the new mount API vfs: Convert gadgetfs to use the new mount API vfs: Convert oprofilefs to use the new mount API vfs: Convert ibmasmfs to use the new mount API vfs: Convert qib_fs/ipathfs to use the new mount API vfs: Convert efivarfs to use the new mount API vfs: Convert configfs to use the new mount API vfs: Convert binfmt_misc to use the new mount API convenience helper: get_tree_single() convenience helper get_tree_nodev() vfs: Kill sget_userns() ...
2019-07-10Merge tag 'fsnotify_for_v5.3-rc1' of ↵Linus Torvalds1-0/+3
git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs Pull fsnotify updates from Jan Kara: "This contains cleanups of the fsnotify name removal hook and also a patch to disable fanotify permission events for 'proc' filesystem" * tag 'fsnotify_for_v5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: fsnotify: get rid of fsnotify_nameremove() fsnotify: move fsnotify_nameremove() hook out of d_delete() configfs: call fsnotify_rmdir() hook debugfs: call fsnotify_{unlink,rmdir}() hooks debugfs: simplify __debugfs_remove_file() devpts: call fsnotify_unlink() hook tracefs: call fsnotify_{unlink,rmdir}() hooks rpc_pipefs: call fsnotify_{unlink,rmdir}() hooks btrfs: call fsnotify_rmdir() hook fsnotify: add empty fsnotify_{unlink,rmdir}() hooks fanotify: Disallow permission events for proc filesystem
2019-07-04vfs: Convert configfs to use the new mount APIDavid Howells1-5/+15
Convert the configfs filesystem to the new internal mount API as the old one will be obsoleted and removed. This allows greater flexibility in communication of mount parameters between userspace, the VFS and the filesystem. See Documentation/filesystems/mount_api.txt for more information. Signed-off-by: David Howells <dhowells@redhat.com> cc: Joel Becker <jlbec@evilplan.org> cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2019-06-20configfs: call fsnotify_rmdir() hookAmir Goldstein1-0/+3
This will allow generating fsnotify delete events on unregister of group/subsystem after the fsnotify_nameremove() hook is removed from d_delete(). The rest of the d_delete() calls from this filesystem are either called recursively from within debugfs_unregister_{group,subsystem}, called from a vfs function that already has delete hooks or are called from shutdown/cleanup code. Cc: Joel Becker <jlbec@evilplan.org> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
2019-05-31Merge tag 'spdx-5.2-rc3-1' of ↵Linus Torvalds7-105/+7
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull yet more SPDX updates from Greg KH: "Here is another set of reviewed patches that adds SPDX tags to different kernel files, based on a set of rules that are being used to parse the comments to try to determine that the license of the file is "GPL-2.0-or-later" or "GPL-2.0-only". Only the "obvious" versions of these matches are included here, a number of "non-obvious" variants of text have been found but those have been postponed for later review and analysis. There is also a patch in here to add the proper SPDX header to a bunch of Kbuild files that we have missed in the past due to new files being added and forgetting that Kbuild uses two different file names for Makefiles. This issue was reported by the Kbuild maintainer. These patches have been out for review on the linux-spdx@vger mailing list, and while they were created by automatic tools, they were hand-verified by a bunch of different people, all whom names are on the patches are reviewers" * tag 'spdx-5.2-rc3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (82 commits) treewide: Add SPDX license identifier - Kbuild treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 225 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 224 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 223 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 222 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 221 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 220 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 218 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 217 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 216 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 215 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 214 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 213 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 211 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 210 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 209 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 207 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 203 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 ...
2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 145Thomas Gleixner7-105/+7
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 021110 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 84 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190524100844.756442981@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-28configfs: Fix use-after-free when accessing sd->s_dentrySahitya Tummala1-8/+6
In the vfs_statx() context, during path lookup, the dentry gets added to sd->s_dentry via configfs_attach_attr(). In the end, vfs_statx() kills the dentry by calling path_put(), which invokes configfs_d_iput(). Ideally, this dentry must be removed from sd->s_dentry but it doesn't if the sd->s_count >= 3. As a result, sd->s_dentry is holding reference to a stale dentry pointer whose memory is already freed up. This results in use-after-free issue, when this stale sd->s_dentry is accessed later in configfs_readdir() path. This issue can be easily reproduced, by running the LTP test case - sh fs_racer_file_list.sh /config (https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/fs/racer/fs_racer_file_list.sh) Fixes: 76ae281f6307 ('configfs: fix race between dentry put and lookup') Signed-off-by: Sahitya Tummala <stummala@codeaurora.org> Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-05-21treewide: Add SPDX license identifier - Makefile/KconfigThomas Gleixner2-0/+2
Add SPDX license identifiers to all Make/Kconfig files which: - Have no license information of any form These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-16Merge tag 'configfs-for-5.2' of git://git.infradead.org/users/hch/configfsLinus Torvalds1-5/+12
Pull configfs update from Christoph Hellwig: - a fix for an error path use after free (YueHaibing) * tag 'configfs-for-5.2' of git://git.infradead.org/users/hch/configfs: configfs: fix possible use-after-free in configfs_register_group
2019-05-08configfs: fix possible use-after-free in configfs_register_groupYueHaibing1-5/+12
In configfs_register_group(), if create_default_group() failed, we forget to unlink the group. It will left a invalid item in the parent list, which may trigger the use-after-free issue seen below: BUG: KASAN: use-after-free in __list_add_valid+0xd4/0xe0 lib/list_debug.c:26 Read of size 8 at addr ffff8881ef61ae20 by task syz-executor.0/5996 CPU: 1 PID: 5996 Comm: syz-executor.0 Tainted: G C 5.0.0+ #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xa9/0x10e lib/dump_stack.c:113 print_address_description+0x65/0x270 mm/kasan/report.c:187 kasan_report+0x149/0x18d mm/kasan/report.c:317 __list_add_valid+0xd4/0xe0 lib/list_debug.c:26 __list_add include/linux/list.h:60 [inline] list_add_tail include/linux/list.h:93 [inline] link_obj+0xb0/0x190 fs/configfs/dir.c:759 link_group+0x1c/0x130 fs/configfs/dir.c:784 configfs_register_group+0x56/0x1e0 fs/configfs/dir.c:1751 configfs_register_default_group+0x72/0xc0 fs/configfs/dir.c:1834 ? 0xffffffffc1be0000 iio_sw_trigger_init+0x23/0x1000 [industrialio_sw_trigger] do_one_initcall+0xbc/0x47d init/main.c:887 do_init_module+0x1b5/0x547 kernel/module.c:3456 load_module+0x6405/0x8c10 kernel/module.c:3804 __do_sys_finit_module+0x162/0x190 kernel/module.c:3898 do_syscall_64+0x9f/0x450 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x462e99 Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f494ecbcc58 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 RAX: ffffffffffffffda RBX: 000000000073bf00 RCX: 0000000000462e99 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000003 RBP: 00007f494ecbcc70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f494ecbd6bc R13: 00000000004bcefa R14: 00000000006f6fb0 R15: 0000000000000004 Allocated by task 5987: set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc.constprop.3+0xa0/0xd0 mm/kasan/common.c:497 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] configfs_register_default_group+0x4c/0xc0 fs/configfs/dir.c:1829 0xffffffffc1bd0023 do_one_initcall+0xbc/0x47d init/main.c:887 do_init_module+0x1b5/0x547 kernel/module.c:3456 load_module+0x6405/0x8c10 kernel/module.c:3804 __do_sys_finit_module+0x162/0x190 kernel/module.c:3898 do_syscall_64+0x9f/0x450 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 5987: set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:459 slab_free_hook mm/slub.c:1429 [inline] slab_free_freelist_hook mm/slub.c:1456 [inline] slab_free mm/slub.c:3003 [inline] kfree+0xe1/0x270 mm/slub.c:3955 configfs_register_default_group+0x9a/0xc0 fs/configfs/dir.c:1836 0xffffffffc1bd0023 do_one_initcall+0xbc/0x47d init/main.c:887 do_init_module+0x1b5/0x547 kernel/module.c:3456 load_module+0x6405/0x8c10 kernel/module.c:3804 __do_sys_finit_module+0x162/0x190 kernel/module.c:3898 do_syscall_64+0x9f/0x450 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8881ef61ae00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 32 bytes inside of 192-byte region [ffff8881ef61ae00, ffff8881ef61aec0) The buggy address belongs to the page: page:ffffea0007bd8680 count:1 mapcount:0 mapping:ffff8881f6c03000 index:0xffff8881ef61a700 flags: 0x2fffc0000000200(slab) raw: 02fffc0000000200 ffffea0007ca4740 0000000500000005 ffff8881f6c03000 raw: ffff8881ef61a700 000000008010000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881ef61ad00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881ef61ad80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff8881ef61ae00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881ef61ae80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881ef61af00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb Fixes: 5cf6a51e6062 ("configfs: allow dynamic group creation") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-04-08fs: mark expected switch fall-throughsGustavo A. R. Silva1-0/+2
In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through. This patch fixes the following warnings: fs/affs/affs.h:124:38: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/configfs/dir.c:1692:11: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/configfs/dir.c:1694:7: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/ceph/file.c:249:3: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/ext4/hash.c:233:15: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/ext4/hash.c:246:15: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/ext2/inode.c:1237:7: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/ext2/inode.c:1244:7: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/ext4/indirect.c:1182:6: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/ext4/indirect.c:1188:6: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/ext4/indirect.c:1432:6: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/ext4/indirect.c:1440:6: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/f2fs/node.c:618:8: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/f2fs/node.c:620:8: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/btrfs/ref-verify.c:522:15: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/gfs2/bmap.c:711:7: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/gfs2/bmap.c:722:7: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/jffs2/fs.c:339:6: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/nfsd/nfs4proc.c:429:12: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/ufs/util.h:62:6: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/ufs/util.h:43:6: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/fcntl.c:770:7: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/seq_file.c:319:10: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/libfs.c:148:11: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/libfs.c:150:7: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/signalfd.c:178:7: warning: this statement may fall through [-Wimplicit-fallthrough=] fs/locks.c:1473:16: warning: this statement may fall through [-Wimplicit-fallthrough=] Warning level 3 was used: -Wimplicit-fallthrough=3 This patch is part of the ongoing efforts to enabling -Wimplicit-fallthrough. Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
2018-07-17configfs: fix registered group removalMike Christie1-0/+11
This patch fixes a bug where configfs_register_group had added a group in a tree, and userspace has done a rmdir on a dir somewhere above that group and we hit a kernel crash. The problem is configfs_rmdir will detach everything under it and unlink groups on the default_groups list. It will not unlink groups added with configfs_register_group so when configfs_unregister_group is called to drop its references to the group/items we crash when we try to access the freed dentrys. The patch just adds a check for if a rmdir has been done above us and if so just does the unlink part of unregistration. Sorry if you are getting this multiple times. I thouhgt I sent this to some of you and lkml, but I do not see it. Signed-off-by: Mike Christie <mchristi@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Christoph Hellwig <hch@lst.de>
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