linux.git/fs/ioctl.c, branch v4.13

sched/headers: Prepare for the reduction of 's signal API dependency

2017-03-02T07:42:37+00:00

Instead of including the full , we are going to include the
types-only  header in , to further
decouple the scheduler header from the signal headers.

This means that various files which relied on the full  need
to be updated to gain an explicit dependency on it.

Update the code that relies on sched.h's inclusion of the  header.

Acked-by: Linus Torvalds 
Cc: Mike Galbraith 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar

vfs: call vfs_clone_file_range() under freeze protection

2016-12-16T10:02:54+00:00

Move sb_start_write()/sb_end_write() out of the vfs helper and up into the
ioctl handler.

Signed-off-by: Amir Goldstein 
Signed-off-by: Miklos Szeredi

vfs: allow vfs_clone_file_range() across mount points

2016-12-16T10:02:54+00:00

FICLONE/FICLONERANGE ioctls return -EXDEV if src and dest
files are not on the same mount point.
Practically, clone only requires that src and dest files
are on the same file system.

Move the check for same mount point to ioctl handler and keep
only the check for same super block in the vfs helper.

A following patch is going to use the vfs_clone_file_range()
helper in overlayfs to copy up between lower and upper
mount points on the same file system.

Signed-off-by: Amir Goldstein 
Signed-off-by: Miklos Szeredi

vfs: cap dedupe request structure size at PAGE_SIZE

2016-09-15T20:29:52+00:00

Kirill A Shutemov reports that the kernel doesn't try to cap dest_count
in any way, and uses the number to allocate kernel memory.  This causes
high order allocation warnings in the kernel log if someone passes in a
big enough value.  We should clamp the allocation at PAGE_SIZE to avoid
stressing the VM.

The two existing users of the dedupe ioctl never send more than 120
requests, so we can safely clamp dest_range at PAGE_SIZE, because with
4k pages we can handle up to 127 dedupe candidates.  Given the max
extent length of 16MB, we can end up doing 2GB of IO which is plenty.

[ Note: the "offsetof()" can't overflow, because 'count' is just a
  16-bit integer.  That's not obvious in the limited context of the
  patch, so I'm noting it here because it made me go look.  - Linus ]

Reported-by: "Kirill A. Shutemov" 
Signed-off-by: Darrick J. Wong 
Signed-off-by: Linus Torvalds

vfs: fix return type of ioctl_file_dedupe_range

2016-09-15T20:29:52+00:00

All the VFS functions in the dedupe ioctl path return int status, so
the ioctl handler ought to as well.

Found by Coverity, CID 1350952.

Signed-off-by: Darrick J. Wong 
Signed-off-by: Linus Torvalds

vfs: ioctl: prevent double-fetch in dedupe ioctl

2016-07-28T22:23:12+00:00

This prevents a double-fetch from user space that can lead to to an
undersized allocation and heap overflow.

Fixes: 54dbc1517237 ("vfs: hoist the btrfs deduplication ioctl to the vfs")
Signed-off-by: Scott Bauer 
Signed-off-by: Linus Torvalds

wrappers for ->i_mutex access

2016-01-22T23:04:28+00:00

parallel to mutex_{lock,unlock,trylock,is_locked,lock_nested},
inode_foo(inode) being mutex_foo(&inode->i_mutex).

Please, use those for access to ->i_mutex; over the coming cycle
->i_mutex will become rwsem, with ->lookup() done with it held
only shared.

Signed-off-by: Al Viro

Merge branch 'work.copy_file_range' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2016-01-13T00:30:34+00:00

Pull vfs copy_file_range updates from Al Viro:
 "Several series around copy_file_range/CLONE"

* 'work.copy_file_range' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  btrfs: use new dedupe data function pointer
  vfs: hoist the btrfs deduplication ioctl to the vfs
  vfs: wire up compat ioctl for CLONE/CLONE_RANGE
  cifs: avoid unused variable and label
  nfsd: implement the NFSv4.2 CLONE operation
  nfsd: Pass filehandle to nfs4_preprocess_stateid_op()
  vfs: pull btrfs clone API to vfs layer
  locks: new locks_mandatory_area calling convention
  vfs: Add vfs_copy_file_range() support for pagecache copies
  btrfs: add .copy_file_range file operation
  x86: add sys_copy_file_range to syscall tables
  vfs: add copy_file_range syscall and vfs helper

compat_ioctl: don't pass fd around when not needed

2016-01-09T02:16:50+00:00

Signed-off-by: Al Viro

vfs: hoist the btrfs deduplication ioctl to the vfs

2016-01-01T07:36:19+00:00

Hoist the btrfs EXTENT_SAME ioctl up to the VFS and make the name
more systematic (FIDEDUPERANGE).

Signed-off-by: Darrick J. Wong 
Signed-off-by: Al Viro