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Christoph Hellwig 1e431f5ce7 cleanup blockdev_direct_IO locking 
Currently the locking in blockdev_direct_IO is a mess, we have three different
locking types and very confusing checks for some of them.  The most
complicated one is DIO_OWN_LOCKING for reads, which happens to not actually be
used.

This patch gets rid of the DIO_OWN_LOCKING - as mentioned above the read case
is unused anyway, and the write side is almost identical to DIO_NO_LOCKING.
The difference is that DIO_NO_LOCKING always sets the create argument for
the get_blocks callback to zero, but we can easily move that to the actual
get_blocks callbacks.  There are four users of the DIO_NO_LOCKING mode:
gfs already ignores the create argument and thus is fine with the new
version, ocfs2 only errors out if create were ever set, and we can remove
this dead code now, the block device code only ever uses create for an
error message if we are fully beyond the device which can never happen,
and last but not least XFS will need the new behavour for writes.

Now we can replace the lock_type variable with a flags one, where no flag
means the DIO_NO_LOCKING behaviour and DIO_LOCKING is kept as the first
flag.  Separate out the check for not allowing to fill holes into a separate
flag, although for now both flags always get set at the same time.

Also revamp the documentation of the locking scheme to actually make sense.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-12-16 12:16:49 -05:00
..
9p 9p: fix build breakage introduced by FS-Cache 2009-12-01 07:35:11 -08:00
adfs adfs: remove redundant test on unsigned 2009-09-24 07:21:05 -07:00
affs
afs afs: remove manual O_SYNC handling 2009-12-10 15:02:50 +01:00
autofs trivial: remove unnecessary semicolons 2009-09-21 15:14:58 +02:00
autofs4 autofs4 - fix missed case when changing to use struct path 2009-08-31 17:44:05 -10:00
befs fs: Make unload_nls() NULL pointer safe 2009-09-24 07:47:42 -04:00
bfs headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
btrfs sanitize xattr handler prototypes 2009-12-16 12:16:49 -05:00
cachefiles Untangling ima mess, part 2: deal with counters 2009-12-16 12:16:47 -05:00
cifs vfs: Implement proper O_SYNC semantics 2009-12-10 15:02:50 +01:00
coda sysctl: Drop & in front of every proc_handler. 2009-11-18 08:37:40 -08:00
configfs writeback: add name to backing_dev_info 2009-09-11 09:20:26 +02:00
cramfs
debugfs debugfs: fix create mutex racy fops and private data 2009-12-11 11:24:53 -08:00
devpts devpts_get_tty() should validate inode 2009-12-11 15:18:05 -08:00
dlm Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm 2009-12-10 09:33:59 -08:00
ecryptfs Untangling ima mess, part 2: deal with counters 2009-12-16 12:16:47 -05:00
efs
exofs exofs: Multi-device mirror support 2009-12-10 09:59:23 +02:00
exportfs
ext2 sanitize xattr handler prototypes 2009-12-16 12:16:49 -05:00
ext3 sanitize xattr handler prototypes 2009-12-16 12:16:49 -05:00
ext4 sanitize xattr handler prototypes 2009-12-16 12:16:49 -05:00
fat Merge git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6 2009-09-30 09:31:14 -07:00
freevxfs headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
fscache FS-Cache: Provide nop fscache_stat_d() if CONFIG_FSCACHE_STATS=n 2009-11-20 21:50:44 +00:00
fuse fuse: reject O_DIRECT flag also in fuse_create 2009-11-27 16:37:13 +01:00
gfs2 sanitize xattr handler prototypes 2009-12-16 12:16:49 -05:00
hfs hfs: fix a potential buffer overflow 2009-12-15 08:53:10 -08:00
hfsplus hfsplus: refuse to mount volumes larger than 2TB 2009-10-29 07:39:27 -07:00
hostfs hostfs: set maximum filesize in superblock for proper LFS support 2009-06-30 18:56:03 -07:00
hpfs headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
hppfs
hugetlbfs Untangling ima mess, part 1: alloc_file() 2009-12-16 12:16:47 -05:00
isofs zisofs: Implement reading of compressed files when PAGE_CACHE_SIZE > compress block size 2009-12-10 15:02:49 +01:00
jbd task_struct: make journal_info conditional 2009-12-15 08:53:27 -08:00
jbd2 task_struct: make journal_info conditional 2009-12-15 08:53:27 -08:00
jffs2 sanitize xattr handler prototypes 2009-12-16 12:16:49 -05:00
jfs tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
lockd sysctl: Drop & in front of every proc_handler. 2009-11-18 08:37:40 -08:00
minix V3 minixfs: add missing directory type checking 2009-09-23 07:39:57 -07:00
ncpfs tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
nfs fix mismerge with Trond's stuff (create_mnt_ns() export is gone now) 2009-12-16 12:16:44 -05:00
nfs_common
nfsd Untangling ima mess, part 3: kill dead code in ima 2009-12-16 12:16:47 -05:00
nilfs2 switch nilfs2 to deactivate_locked_super() 2009-12-16 12:16:42 -05:00
nls Merge git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6 2009-09-30 09:31:14 -07:00
notify switch alloc_file() to passing struct path 2009-12-16 12:16:42 -05:00
ntfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-12-09 19:43:33 -08:00
ocfs2 cleanup blockdev_direct_IO locking 2009-12-16 12:16:49 -05:00
omfs tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
openpromfs
partitions partitions: read whole sector with EFI GPT header 2009-11-23 09:29:58 +01:00
proc procfs: allow threads to rename siblings via /proc/pid/tasks/tid/comm 2009-12-15 08:53:24 -08:00
qnx4 qnx4fs: add missing KERN_xxx to printk() calls 2009-11-09 09:40:57 +01:00
quota quota: Implement quota format with 64-bit space and inode limits 2009-12-10 15:02:54 +01:00
ramfs truncate: use new helpers 2009-09-24 08:41:47 -04:00
reiserfs sanitize xattr handler prototypes 2009-12-16 12:16:49 -05:00
romfs ROMFS: fix length used with romfs_dev_strnlen() function 2009-10-11 11:33:56 -07:00
smbfs fs: Make unload_nls() NULL pointer safe 2009-09-24 07:47:42 -04:00
squashfs const: mark remaining super_operations const 2009-09-22 07:17:24 -07:00
sysfs sysfs: sysfs_setattr remove unnecessary permission check. 2009-12-11 11:24:54 -08:00
sysv
ubifs fs/ubifs: use %pUB to print UUIDs 2009-12-15 08:53:33 -08:00
udf udf: Avoid IO in udf_clear_inode 2009-12-14 21:40:04 +01:00
ufs ufs: sector_t cannot be negative 2009-06-18 13:03:46 -07:00
xfs cleanup blockdev_direct_IO locking 2009-12-16 12:16:49 -05:00
aio.c block: move bdi/address_space unplug functions to backing-dev.h 2009-10-29 13:59:26 +01:00
anon_inodes.c switch alloc_file() to passing struct path 2009-12-16 12:16:42 -05:00
attr.c truncate: new helpers 2009-09-24 08:41:47 -04:00
bad_inode.c
binfmt_aout.c
binfmt_elf_fdpic.c nommu: fix malloc performance by adding uninitialized flag 2009-12-15 08:53:24 -08:00
binfmt_elf.c tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
binfmt_em86.c
binfmt_flat.c flat: use IS_ERR_VALUE() helper macro 2009-09-24 07:21:03 -07:00
binfmt_misc.c
binfmt_script.c
binfmt_som.c
bio-integrity.c block: Create bip slabs with embedded integrity vectors 2009-07-01 10:56:25 +02:00
bio.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-12-09 19:43:33 -08:00
block_dev.c Merge branch 'for-linus' into for-2.6.33 2009-11-03 21:14:39 +01:00
buffer.c Merge branch 'writeback' of git://git.kernel.dk/linux-2.6-block 2009-09-25 09:27:30 -07:00
char_dev.c fs/char_dev.c: remove useless loop 2009-09-24 07:21:03 -07:00
compat_binfmt_elf.c
compat_ioctl.c md: move compat_ioctl handling into md.c 2009-12-14 12:51:41 +11:00
compat.c x86, fs: Fix x86 procfs stack information for threads on 64-bit 2009-11-04 13:25:03 +01:00
dcache.c libfs: move EXPORT_SYMBOL for d_alloc_name 2009-12-16 12:16:48 -05:00
dcookies.c
direct-io.c cleanup blockdev_direct_IO locking 2009-12-16 12:16:49 -05:00
drop_caches.c sysctl: remove "struct file *" argument of ->proc_handler 2009-09-24 07:21:04 -07:00
eventfd.c anonfd: split interface into file creation and install 2009-09-23 07:39:29 -07:00
eventpoll.c sysctl: Drop & in front of every proc_handler. 2009-11-18 08:37:40 -08:00
exec.c procfs: allow threads to rename siblings via /proc/pid/tasks/tid/comm 2009-12-15 08:53:24 -08:00
fcntl.c fcntl: rename F_OWNER_GID to F_OWNER_PGRP 2009-11-17 17:40:33 -08:00
fifo.c
file_table.c Untangling ima mess, part 1: alloc_file() 2009-12-16 12:16:47 -05:00
file.c headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
filesystems.c
fs_struct.c
fs-writeback.c writeback: remove unused nonblocking and congestion checks 2009-12-03 13:54:25 +01:00
generic_acl.c make generic_acl slightly more generic 2009-12-16 12:16:49 -05:00
inode.c LSM: imbed ima calls in the security hooks 2009-10-25 12:22:48 +08:00
internal.h fs: move get_empty_filp() deffinition to internal.h 2009-12-16 12:16:45 -05:00
ioctl.c __generic_block_fiemap(): fix for files bigger than 4GB 2009-11-12 07:26:01 -08:00
ioprio.c
Kconfig task_struct: make journal_info conditional 2009-12-15 08:53:27 -08:00
Kconfig.binfmt
libfs.c libfs: move EXPORT_SYMBOL for d_alloc_name 2009-12-16 12:16:48 -05:00
locks.c const: make lock_manager_operations const 2009-09-22 07:17:25 -07:00
Makefile
mbcache.c
mpage.c
namei.c vfs: force reval of target when following LAST_BIND symlinks (try #7) 2009-12-16 12:16:48 -05:00
namespace.c fix mismerge with Trond's stuff (create_mnt_ns() export is gone now) 2009-12-16 12:16:44 -05:00
nfsctl.c
no-block.c
open.c Untangling ima mess, part 2: deal with counters 2009-12-16 12:16:47 -05:00
pipe.c switch create_read_pipe() to alloc_file() 2009-12-16 12:16:43 -05:00
pnode.c
pnode.h
posix_acl.c
read_write.c sendfile(): check f_op.splice_write() rather than f_op.sendpage() 2009-11-04 09:09:52 +01:00
read_write.h
readdir.c
select.c headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
seq_file.c vfs: seq_file: add helpers for data filling 2009-09-24 07:47:35 -04:00
signalfd.c
splice.c sendfile(): check f_op.splice_write() rather than f_op.sendpage() 2009-11-04 09:09:52 +01:00
stack.c
stat.c
super.c freeze_bdev: grab active reference to frozen superblocks 2009-09-24 07:47:41 -04:00
sync.c kill wait_on_page_writeback_range 2009-12-10 15:02:50 +01:00
timerfd.c
utimes.c
xattr_acl.c VFS: Use GFP_NOFS in posix_acl_from_xattr() 2009-12-03 11:48:07 +00:00
xattr.c sanitize xattr handler prototypes 2009-12-16 12:16:49 -05:00