Eric W. Biederman 80b5dce8c5 vfs: Add a function to lazily unmount all mounts from any dentry. ...

The new function detach_mounts comes in two pieces.  The first piece
is a static inline test of d_mounpoint that returns immediately
without taking any locks if d_mounpoint is not set.  In the common
case when mountpoints are absent this allows the vfs to continue
running with it's same cacheline foot print.

The second piece of detach_mounts __detach_mounts actually does the
work and it assumes that a mountpoint is present so it is slow and
takes namespace_sem for write, and then locks the mount hash (aka
mount_lock) after a struct mountpoint has been found.

With those two locks held each entry on the list of mounts on a
mountpoint is selected and lazily unmounted until all of the mount
have been lazily unmounted.

v7: Wrote a proper change description and removed the changelog
    documenting deleted wrong turns.

Signed-off-by: Eric W. Biederman <ebiederman@twitter.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2014-10-09 02:38:55 -04:00

..

9p

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2014-06-12 10:30:18 -07:00

adfs

adfs: add __printf verification, fix format/argument mismatches

2014-08-08 15:57:24 -07:00

affs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2014-06-12 10:30:18 -07:00

afs

AFS: Correctly assemble the client UUID

2014-07-29 10:14:36 -07:00

autofs4

autofs - remove obsolete d_invalidate() from expire

2014-10-09 02:38:52 -04:00

befs

fs/befs/linuxvfs.c: check superblock before dump operation

2014-08-08 15:57:20 -07:00

bfs

fs/bfs: use bfs prefix for dump_imap

2014-08-08 15:57:24 -07:00

btrfs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs

2014-09-19 13:10:53 -07:00

cachefiles

fs/cachefiles: add missing \n to kerror conversions

2014-09-26 08:10:35 -07:00

ceph

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client

2014-08-13 17:43:29 -06:00

cifs

Fix mfsymlinks file size check

2014-09-16 06:48:20 -05:00

coda

fs/coda: use linux/uaccess.h

2014-08-08 15:57:20 -07:00

configfs

fs/configfs: use pr_fmt

2014-06-04 16:53:53 -07:00

cramfs

fs/cramfs/inode.c: use linux/uaccess.h

2014-08-08 15:57:25 -07:00

debugfs

fs: debugfs: remove trailing whitespace

2014-07-09 16:58:21 -07:00

devpts

fs/devpts/inode.c: convert printk to pr_foo()

2014-06-06 16:08:14 -07:00

dlm

fs/dlm/debug_fs.c: remove unnecessary null test before debugfs_remove

2014-08-08 15:57:27 -07:00

ecryptfs

write_iter variants of {__,}generic_file_aio_write()

2014-05-06 17:38:00 -04:00

efivarfs

fs/efivarfs/super.c: use static const for dentry_operations

2014-06-04 16:54:14 -07:00

efs

fs/efs/namei.c: return is not a function

2014-08-08 15:57:18 -07:00

exofs

fs/exofs/ore_raid.c: replace count*size kzalloc by kcalloc

2014-08-08 15:57:24 -07:00

exportfs

fs/exportfs/expfs.c: kernel-doc warning fixes

2014-06-04 16:54:14 -07:00

ext2

fs/ext2/super.c: Drop memory allocation cast

2014-07-15 22:40:22 +02:00

ext3

ext3: Count internal journal as bsddf overhead in ext3_statfs

2014-08-19 23:16:51 +02:00

ext4

ext4: avoid trying to kfree an ERR_PTR pointer

2014-09-03 09:37:30 -04:00

f2fs

f2fs: reposition unlock_new_inode to prevent accessing invalid inode

2014-09-02 00:22:24 -07:00

fat

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2014-06-12 10:30:18 -07:00

freevxfs

Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

2014-04-04 15:39:39 -07:00

fscache

FS-Cache: refcount becomes corrupt under vma pressure.

2014-09-17 22:41:40 +01:00

fuse

fuse: honour max_read and max_write in direct_io mode

2014-09-26 21:16:51 -04:00

gfs2

GFS2: fix d_splice_alias() misuses

2014-09-12 20:58:55 +01:00

hfs

write_iter variants of {__,}generic_file_aio_write()

2014-05-06 17:38:00 -04:00

hfsplus

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2014-06-12 10:30:18 -07:00

hostfs

hostfs: support rename flags

2014-08-07 14:40:09 -04:00

hpfs

fs/hpfs/dnode.c: fix suspect code indent

2014-08-08 15:57:22 -07:00

hppfs

…

hugetlbfs

fs/hugetlbfs/inode.c: remove null test before kfree

2014-06-04 16:54:11 -07:00

isofs

isofs: Fix unbounded recursion when processing relocated directories

2014-08-19 18:29:30 +02:00

jbd

fs/jbd/revoke.c: replace shift loop by ilog2

2014-05-21 10:26:13 +02:00

jbd2

jbd2: fix descriptor block size handling errors with journal_csum

2014-08-28 22:22:29 -04:00

jffs2

Merge tag 'for-linus-20140808' of git://git.infradead.org/linux-mtd

2014-08-08 18:13:21 -07:00

jfs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2014-06-12 10:30:18 -07:00

kernfs

Merge 3.16-rc6 into driver-core-next

2014-07-21 10:07:25 -07:00

lockd

lockd: fix rpcbind crash on lockd startup failure

2014-09-08 12:03:32 -04:00

logfs

fs/logfs/readwrite.c: kernel-doc warning fixes

2014-08-06 18:01:12 -07:00

minix

minix zmap block counts calculation fix

2014-08-08 15:57:20 -07:00

ncpfs

fs/ncpfs/getopt.c: replace simple_strtoul by kstrtoul

2014-06-04 16:54:21 -07:00

nfs

NFSv4: Fix another bug in the close/open_downgrade code

2014-09-18 13:04:22 -04:00

nfs_common

fs/nfs_common/nfsacl.c: move EXPORT symbol after functions

2014-07-12 18:43:42 -04:00

nfsd

nfsd4: fix rd_dircount enforcement

2014-09-08 12:02:03 -04:00

nilfs2

nilfs2: fix data loss with mmap()

2014-09-26 08:10:34 -07:00

nls

…

notify

fs/notify: don't show f_handle if exportfs_encode_inode_fh failed

2014-09-10 15:42:12 -07:00

ntfs

ntfs: kernel-doc warning fixes

2014-08-06 18:01:12 -07:00

ocfs2

ocfs2/dlm: do not get resource spinlock if lockres is new

2014-09-26 08:10:34 -07:00

omfs

fs/omfs/inode.c: replace count*size kzalloc by kcalloc

2014-08-08 15:57:25 -07:00

openpromfs

fs: push sync_filesystem() down to the file system's remount_fs()

2014-03-13 10:14:33 -04:00

proc

mm: softdirty: addresses before VMAs in PTE holes aren't softdirty

2014-09-26 08:10:35 -07:00

pstore

fs/pstore/ram_core.c: replace count*size kmalloc by kmalloc_array

2014-08-08 15:57:25 -07:00

qnx4

fs: push sync_filesystem() down to the file system's remount_fs()

2014-03-13 10:14:33 -04:00

qnx6

fs/qnx6: update debugging to current functions

2014-08-08 15:57:26 -07:00

quota

fs/quota: kernel-doc warning fixes

2014-07-15 22:40:23 +02:00

ramfs

fs/ramfs/file-nommu.c: replace count*size kzalloc by kcalloc

2014-08-08 15:57:18 -07:00

reiserfs

Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

2014-08-13 17:45:40 -06:00

romfs

fs/romfs/super.c: add blank line after declarations

2014-08-08 15:57:25 -07:00

squashfs

fs/squashfs/super.c: logging cleanup

2014-08-06 18:01:13 -07:00

sysfs

kernfs: move the last knowledge of sysfs out from kernfs

2014-06-03 08:11:18 -07:00

sysv

write_iter variants of {__,}generic_file_aio_write()

2014-05-06 17:38:00 -04:00

ubifs

UBIFS: Add log overlap assertions

2014-07-31 15:52:51 +03:00

udf

udf: saner calling conventions for udf_new_inode()

2014-09-04 21:37:41 +02:00

ufs

ufs: deal with nfsd/iget races

2014-09-26 21:17:52 -04:00

xfs

xfs: trim eofblocks before collapse range

2014-09-02 12:12:53 +10:00

aio.c

aio: block exit_aio() until all context requests are completed

2014-09-04 16:54:47 -04:00

anon_inodes.c

vfs: Allocate anon_inode_inode in anon_inode_init()

2014-03-27 09:52:54 -07:00

attr.c

fs,userns: Change inode_capable to capable_wrt_inode_uidgid

2014-06-10 13:57:22 -07:00

bad_inode.c

bad_inode: add ->rename2()

2014-08-07 14:40:09 -04:00

binfmt_aout.c

…

binfmt_elf_fdpic.c

…

binfmt_elf.c

Merge branch 'x86/vdso' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next

2014-06-05 08:05:29 -07:00

binfmt_em86.c

…

binfmt_flat.c

fs/binfmt_flat.c: make old_reloc() static

2014-06-04 16:54:21 -07:00

binfmt_misc.c

binfmt_misc: add missing 'break' statement

2014-04-03 16:21:16 -07:00

binfmt_script.c

…

binfmt_som.c

…

block_dev.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2014-06-12 10:30:18 -07:00

buffer.c

Fix nasty 32-bit overflow bug in buffer i/o code.

2014-09-22 08:41:16 -07:00

char_dev.c

…

compat_binfmt_elf.c

binfmt_elf: add ELF_HWCAP2 to compat auxv entries

2014-03-04 08:05:21 +00:00

compat_ioctl.c

Bluetooth: Move HCI socket definitions into its own header file

2014-07-11 13:53:04 +03:00

compat.c

locks: rename file-private locks to "open file description locks"

2014-04-22 08:23:58 -04:00

coredump.c

coredump: fix the setting of PF_DUMPCORE

2014-07-23 15:10:54 -07:00

dcache.c

vfs: More precise tests in d_invalidate

2014-10-09 02:38:54 -04:00

dcookies.c

…

direct-io.c

fuse: honour max_read and max_write in direct_io mode

2014-09-26 21:16:51 -04:00

drop_caches.c

fs: convert use of typedef ctl_table to struct ctl_table

2014-06-06 16:08:16 -07:00

eventfd.c

…

eventpoll.c

eventpoll: fix uninitialized variable in epoll_ctl

2014-09-10 15:42:12 -07:00

exec.c

fork/exec: cleanup mm initialization

2014-08-08 15:57:23 -07:00

fcntl.c

shm: add sealing API

2014-08-08 15:57:31 -07:00

fhandle.c

…

file_table.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2014-06-12 10:30:18 -07:00

file.c

fs/file.c: don't open-code kvfree()

2014-05-06 17:31:10 -04:00

filesystems.c

sys_sysfs: Add CONFIG_SYSFS_SYSCALL

2014-04-03 16:21:05 -07:00

fs_pin.c

make fs/{namespace,super}.c forget about acct.h

2014-08-07 14:40:09 -04:00

fs_struct.c

…

fs-writeback.c

sched: Remove proliferation of wait_on_bit() action functions

2014-07-16 15:10:39 +02:00

inode.c

mm: allow drivers to prevent new writable mappings

2014-08-08 15:57:31 -07:00

internal.h

make fs/{namespace,super}.c forget about acct.h

2014-08-07 14:40:09 -04:00

ioctl.c

…

Kconfig

…

Kconfig.binfmt

…

libfs.c

fs/libfs.c: add generic data flush to fsync

2014-06-04 16:53:55 -07:00

locks.c

locks: pass correct "before" pointer to locks_unlink_lock in generic_add_lease

2014-08-22 09:58:22 -04:00

Makefile

take fs_pin stuff to fs/*

2014-08-07 14:40:08 -04:00

mbcache.c

fs/mbcache: replace __builtin_log2() with ilog2()

2014-06-25 22:08:29 -04:00

mount.h

vfs: Add a function to lazily unmount all mounts from any dentry.

2014-10-09 02:38:55 -04:00

mpage.c

fs/block_dev.c: add bdev_read_page() and bdev_write_page()

2014-06-04 16:54:02 -07:00

namei.c

vfs: Don't allow overwriting mounts in the current mount namespace

2014-10-09 02:38:54 -04:00

namespace.c

vfs: Add a function to lazily unmount all mounts from any dentry.

2014-10-09 02:38:55 -04:00

no-block.c

…

open.c

vfs: fix check for fallocate on active swapfile

2014-08-01 02:36:04 -04:00

pipe.c

new helper: copy_page_from_iter()

2014-05-06 17:39:42 -04:00

pnode.c

get rid of propagate_umount() mistakenly treating slaves as busy.

2014-08-30 18:31:41 -04:00

pnode.h

smarter propagate_mnt()

2014-04-01 23:19:08 -04:00

posix_acl.c

posix_acl: handle NULL ACL in posix_acl_equiv_mode

2014-05-06 13:58:42 -04:00

proc_namespace.c

namespaces: Use task_lock and not rcu to protect nsproxy

2014-07-29 18:08:50 -07:00

read_write.c

switch simple generic_file_aio_read() users to ->read_iter()

2014-05-06 17:37:55 -04:00

readdir.c

fanotify: create FAN_ACCESS event for readdir

2014-06-04 16:53:52 -07:00

select.c

…

seq_file.c

fs/seq_file: fallback to vmalloc allocation

2014-07-03 09:21:54 -07:00

signalfd.c

…

splice.c

Merge commit '9f12600fe425bc28f0ccba034a77783c09c15af4' into for-linus

2014-06-12 00:28:09 -04:00

stack.c

…

stat.c

…

statfs.c

…

super.c

Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

2014-08-13 17:45:40 -06:00

sync.c

Export sync_filesystem() for modular ->remount_fs() use

2014-09-05 08:16:21 -07:00

timerfd.c

timerfd: Use ktime_mono_to_real()

2014-07-23 10:18:02 -07:00

utimes.c

…

xattr.c

simple_xattr: permit 0-size extended attributes

2014-07-23 15:10:55 -07:00