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54a4ef8af4e0dc5c983d17fcb9cf5fd25666d94e
linux/fs
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Christoph Hellwig 54a4ef8af4 xfs: reject all unaligned direct writes to reflinked files 
We currently fall back from direct to buffered writes if we detect a
remaining shared extent in the iomap_begin callback.  But by the time
iomap_begin is called for the potentially unaligned end block we might
have already written most of the data to disk, which we'd now write
again using buffered I/O.  To avoid this reject all writes to reflinked
files before starting I/O so that we are guaranteed to only write the
data once.

The alternative would be to unshare the unaligned start and/or end block
before doing the I/O. I think that's doable, and will actually be
required to support reflinks on DAX file system.  But it will take a
little more time and I'd rather get rid of the double write ASAP.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2017-02-06 17:47:46 -08:00
..
9p
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
adfs
…
affs
vfs: remove ".readlink = generic_readlink" assignments
2016-12-09 16:45:04 +01:00
afs
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
autofs4
Merge uncontroversial parts of branch 'readlink' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
2016-12-17 19:16:12 -08:00
befs
befs: add NFS export support
2016-12-22 11:25:24 +00:00
bfs
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
btrfs
Merge branch 'for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
2017-01-27 12:41:46 -08:00
cachefiles
…
ceph
ceph: fix bad endianness handling in parse_reply_info_extra
2017-01-18 17:58:45 +01:00
cifs
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
coda
vfs: remove ".readlink = generic_readlink" assignments
2016-12-09 16:45:04 +01:00
configfs
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
cramfs
…
crypto
fscrypt: fix renaming and linking special files
2016-12-31 00:47:05 -05:00
debugfs
…
devpts
…
dlm
ktime: Get rid of ktime_equal()
2016-12-25 17:21:23 +01:00
ecryptfs
vfs: remove ".readlink = generic_readlink" assignments
2016-12-09 16:45:04 +01:00
efivarfs
…
efs
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
exofs
exofs: don't mess with simple_write_{begin,end}
2016-12-10 14:25:19 -05:00
exportfs
…
ext2
iomap: constify struct iomap_ops
2017-01-30 16:32:25 -08:00
ext4
iomap: constify struct iomap_ops
2017-01-30 16:32:25 -08:00
f2fs
block: Rename blk_queue_zone_size and bdev_zone_size
2017-01-12 07:58:32 -07:00
fat
…
freevxfs
…
fscache
…
fuse
fuse: fix time_to_jiffies nsec sanity check
2017-01-13 17:20:47 +01:00
gfs2
ktime: Cleanup ktime_set() usage
2016-12-25 17:21:22 +01:00
hfs
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
hfsplus
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
hostfs
vfs: remove ".readlink = generic_readlink" assignments
2016-12-09 16:45:04 +01:00
hpfs
…
hugetlbfs
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
isofs
Merge branch 'for-4.10/block' of git://git.kernel.dk/linux-block
2016-12-13 10:19:16 -08:00
jbd2
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
jffs2
vfs: remove ".readlink = generic_readlink" assignments
2016-12-09 16:45:04 +01:00
jfs
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
kernfs
Merge uncontroversial parts of branch 'readlink' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
2016-12-17 19:16:12 -08:00
lockd
netns: make struct pernet_operations::id unsigned int
2016-11-18 10:59:15 -05:00
minix
vfs: remove ".readlink = generic_readlink" assignments
2016-12-09 16:45:04 +01:00
ncpfs
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
nfs
pNFS: Fix a reference leak in _pnfs_return_layout
2017-01-26 15:50:41 -05:00
nfs_common
netns: make struct pernet_operations::id unsigned int
2016-11-18 10:59:15 -05:00
nfsd
nfsd: fix supported attributes for acl & labels
2017-01-12 15:55:51 -05:00
nilfs2
Merge uncontroversial parts of branch 'readlink' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
2016-12-17 19:16:12 -08:00
nls
…
notify
Merge branch 'stable-4.10' of git://git.infradead.org/users/pcmoore/audit
2017-01-05 23:06:06 -08:00
ntfs
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
ocfs2
ocfs2: fix crash caused by stale lvb with fsdlm plugin
2017-01-10 18:31:54 -08:00
omfs
…
openpromfs
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
orangefs
Merge uncontroversial parts of branch 'readlink' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
2016-12-17 19:16:12 -08:00
overlayfs
ovl: fix possible use after free on redirect dir lookup
2017-01-18 15:19:54 +01:00
proc
proc: add a schedule point in proc_pid_readdir()
2017-01-24 16:26:14 -08:00
pstore
Merge tag 'pstore-v4.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2016-12-13 09:16:11 -08:00
qnx4
…
qnx6
…
quota
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2016-12-19 08:23:53 -08:00
ramfs
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
reiserfs
Merge uncontroversial parts of branch 'readlink' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
2016-12-17 19:16:12 -08:00
romfs
romfs: use different way to generate fsid for BLOCK or MTD
2017-01-24 16:26:14 -08:00
squashfs
Merge uncontroversial parts of branch 'readlink' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
2016-12-17 19:16:12 -08:00
sysfs
…
sysv
vfs: remove ".readlink = generic_readlink" assignments
2016-12-09 16:45:04 +01:00
tracefs
…
ubifs
ubifs: Fix journal replay wrt. xattr nodes
2017-01-17 14:35:58 +01:00
udf
…
ufs
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
xfs
xfs: reject all unaligned direct writes to reflinked files
2017-02-06 17:47:46 -08:00
aio.c
aio: fix lock dep warning
2017-01-14 19:31:40 -05:00
anon_inodes.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
attr.c
…
bad_inode.c
bad_inode: add missing i_op initializers
2016-12-09 11:57:43 +01:00
binfmt_aout.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
binfmt_elf_fdpic.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
binfmt_elf.c
coredump: Ensure proper size of sparse core files
2017-01-14 19:32:40 -05:00
binfmt_em86.c
…
binfmt_flat.c
…
binfmt_misc.c
…
binfmt_script.c
…
block_dev.c
block: fix use after free in __blkdev_direct_IO
2017-01-24 07:55:53 -07:00
buffer.c
clean_bdev_aliases: Prevent cleaning blocks that are not in block range
2017-01-02 09:35:14 -07:00
char_dev.c
…
compat_binfmt_elf.c
…
compat_ioctl.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
compat.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
coredump.c
coredump: Ensure proper size of sparse core files
2017-01-14 19:32:40 -05:00
dax.c
iomap: constify struct iomap_ops
2017-01-30 16:32:25 -08:00
dcache.c
mnt: Protect the mountpoint hashtable with mount_lock
2017-01-10 13:34:43 +13:00
dcookies.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
direct-io.c
do_direct_IO: Use inode->i_blkbits to compute block count to be cleaned
2017-01-10 13:29:54 -07:00
drop_caches.c
…
eventfd.c
…
eventpoll.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
exec.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
fcntl.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
fhandle.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
file_table.c
constify alloc_file()
2016-12-05 19:01:16 -05:00
file.c
…
filesystems.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
fs_pin.c
…
fs_struct.c
…
fs-writeback.c
fs/fs-writeback.c: remove redundant if check
2016-12-12 18:55:08 -08:00
inode.c
…
internal.h
iomap: constify struct iomap_ops
2017-01-30 16:32:25 -08:00
ioctl.c
vfs: call vfs_clone_file_range() under freeze protection
2016-12-16 11:02:54 +01:00
iomap.c
iomap: constify struct iomap_ops
2017-01-30 16:32:25 -08:00
Kconfig
dax: fix build warnings with FS_DAX and !FS_IOMAP
2017-01-24 16:26:14 -08:00
Kconfig.binfmt
…
libfs.c
libfs: Modify mount_pseudo_xattr to be clear it is not a userspace mount
2017-01-10 13:34:55 +13:00
locks.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
Makefile
logfs: remove from tree
2016-12-14 23:48:11 -05:00
mbcache.c
mbcache: document that "find" functions only return reusable entries
2016-12-03 15:55:01 -05:00
mount.h
vfs: add path_is_mountpoint() helper
2016-12-03 20:51:35 -05:00
mpage.c
fs: Add helper to clean bdev aliases under a bh and use it
2016-11-04 14:34:47 -06:00
namei.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
namespace.c
mnt: Protect the mountpoint hashtable with mount_lock
2017-01-10 13:34:43 +13:00
no-block.c
…
nsfs.c
…
open.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
pipe.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
pnode.c
reorganize do_make_slave()
2016-12-16 16:30:49 -05:00
pnode.h
…
posix_acl.c
tmpfs: clear S_ISGID when setting posix ACLs
2017-01-10 01:29:48 -05:00
proc_namespace.c
…
read_write.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
readdir.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
select.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
seq_file.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
signalfd.c
…
splice.c
splice: reinstate SIGPIPE/EPIPE handling
2016-12-21 10:59:34 -08:00
stack.c
…
stat.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
statfs.c
vfs: misc struct path constification
2016-12-05 19:03:49 -05:00
super.c
quota: Remove dqonoff_mutex
2016-11-30 08:38:07 +01:00
sync.c
…
timerfd.c
ktime: Cleanup ktime_set() usage
2016-12-25 17:21:22 +01:00
userfaultfd.c
userfaultfd: fix SIGBUS resulting from false rwsem wakeups
2017-01-24 16:26:14 -08:00
utimes.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
xattr.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00