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0273201e69
linux/fs
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Zach Brown 0273201e69 [PATCH] dio: formalize bio counters as a dio reference count 
Previously we had two confusing counts of bio progress.  'bio_count' was
decremented as bios were processed and freed by the dio core.  It was used to
indicate final completion of the dio operation.  'bios_in_flight' reflected
how many bios were between submit_bio() and bio->end_io.  It was used by the
sync path to decide when to wake up and finish completing bios and was ignored
by the async path.

This patch collapses the two notions into one notion of a dio reference count.
 bios hold a dio reference when they're between submit_bio and bio->end_io.

Since bios_in_flight was only used in the sync path it is now equivalent to
dio->refcount - 1 which accounts for direct_io_worker() holding a reference
for the duration of the operation.

dio_bio_complete() -> finished_one_bio() was called from the sync path after
finding bios on the list that the bio->end_io function had deposited.
finished_one_bio() can not drop the dio reference on behalf of these bios now
because bio->end_io already has.  The is_async test in finished_one_bio()
meant that it never actually did anything other than drop the bio_count for
sync callers.  So we remove its refcount decrement, don't call it from
dio_bio_complete(), and hoist its call up into the async dio_bio_complete()
caller after an explicit refcount decrement.  It is renamed dio_complete_aio()
to reflect the remaining work it actually does.

Signed-off-by: Zach Brown <zach.brown@oracle.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Suparna Bhattacharya <suparna@in.ibm.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-10 09:57:21 -08:00
..
9p [PATCH] 9p: change uses of f_{dentry,vfsmnt} to use f_path 2006-12-08 08:28:43 -08:00
adfs [PATCH] struct path: convert adfs 2006-12-08 08:28:43 -08:00
affs [PATCH] affs: change uses of f_{dentry, vfsmnt} to use f_path 2006-12-08 08:28:43 -08:00
afs [PATCH] rename struct namespace to struct mnt_namespace 2006-12-08 08:28:51 -08:00
autofs [PATCH] autofs: change uses of f_{dentry, vfsmnt} to use f_path 2006-12-08 08:28:43 -08:00
autofs4 [PATCH] autofs4: change uses of f_{dentry, vfsmnt} to use f_path 2006-12-08 08:28:43 -08:00
befs [PATCH] struct path: convert befs 2006-12-08 08:28:44 -08:00
bfs [PATCH] struct path: convert bfs 2006-12-08 08:28:44 -08:00
cifs [PATCH] io-accounting-read-accounting cifs fix 2006-12-10 09:55:41 -08:00
coda [PATCH] struct path: convert coda 2006-12-08 08:28:44 -08:00
configfs [PATCH] configfs: change uses of f_{dentry, vfsmnt} to use f_path 2006-12-08 08:28:43 -08:00
cramfs [PATCH] struct path: convert cramfs 2006-12-08 08:28:44 -08:00
debugfs [PATCH] debugfs: add header file 2006-11-25 13:28:33 -08:00
devpts [PATCH] inode-diet: Eliminate i_blksize from the inode structure 2006-09-27 08:26:18 -07:00
dlm Merge master.kernel.org:/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw 2006-12-07 09:13:20 -08:00
ecryptfs [PATCH] ecryptfs: change uses of f_{dentry, vfsmnt} to use f_path 2006-12-08 08:28:43 -08:00
efs [PATCH] struct path: convert efs 2006-12-08 08:28:45 -08:00
exportfs [PATCH] VFS: Make filldir_t and struct kstat deal in 64-bit inode numbers 2006-10-03 08:03:40 -07:00
ext2 [PATCH] LOG2: Implement a general integer log2 facility in the kernel 2006-12-08 08:28:51 -08:00
ext3 [PATCH] LOG2: Implement a general integer log2 facility in the kernel 2006-12-08 08:28:51 -08:00
ext4 [PATCH] ext4: change uses of f_{dentry, vfsmnt} to use f_path 2006-12-08 08:28:41 -08:00
fat [PATCH] fat: change uses of f_{dentry,vfsmnt} to use f_path 2006-12-08 08:28:41 -08:00
freevxfs [PATCH] struct path: convert freevxfs 2006-12-08 08:28:45 -08:00
fuse [PATCH] struct path: convert fuse 2006-12-08 08:28:45 -08:00
gfs2 [PATCH] struct path: convert gfs2 2006-12-08 08:28:45 -08:00
hfs [PATCH] struct path: convert hfs 2006-12-08 08:28:45 -08:00
hfsplus [PATCH] struct path: convert hfsplus 2006-12-08 08:28:45 -08:00
hostfs [PATCH] struct path: convert hostfs 2006-12-08 08:28:45 -08:00
hpfs [PATCH] struct path: convert hpfs 2006-12-08 08:28:45 -08:00
hppfs [PATCH] struct path: convert hppfs 2006-12-08 08:28:45 -08:00
hugetlbfs [PATCH] struct path: convert hugetlbfs 2006-12-08 08:28:45 -08:00
isofs [PATCH] isofs: change uses of f_{dentry, vfsmnt} to use f_path 2006-12-08 08:28:41 -08:00
jbd [PATCH] make fs/jbd/transaction.c:__journal_temp_unlink_buffer() static 2006-12-07 08:39:40 -08:00
jbd2 [PATCH] jbd2: wait for already submitted t_sync_datalist buffer to complete 2006-12-07 08:39:42 -08:00
jffs [PATCH] struct path: convert jffs 2006-12-08 08:28:46 -08:00
jffs2 [PATCH] struct path: convert jffs2 2006-12-08 08:28:46 -08:00
jfs [PATCH] struct path: convert jfs 2006-12-08 08:28:46 -08:00
lockd [PATCH] struct path: convert lockd 2006-12-08 08:28:47 -08:00
minix [PATCH] struct path: convert minix 2006-12-08 08:28:47 -08:00
msdos [PATCH] fat: add fat_getattr() 2006-11-16 11:43:38 -08:00
ncpfs [PATCH] struct path: convert ncpfs 2006-12-08 08:28:48 -08:00
nfs [PATCH] rename struct namespace to struct mnt_namespace 2006-12-08 08:28:51 -08:00
nfs_common [PATCH] nfs_common endianness annotations 2006-10-20 10:26:41 -07:00
nfsd [PATCH] nfsd: replace kmalloc+memset with kcalloc + simplify NULL check 2006-12-08 08:29:02 -08:00
nls [PATCH] fs: make nls_cp936.c handle some U00XY characters and U20AC correctly 2006-12-07 08:39:46 -08:00
ntfs [PATCH] ntfs: change uses of f_{dentry, vfsmnt} to use f_path 2006-12-08 08:28:42 -08:00
ocfs2 [PATCH] struct path: convert ocfs2 2006-12-08 08:28:48 -08:00
openpromfs [PATCH] struct path: convert openpromfs 2006-12-08 08:28:48 -08:00
partitions [MIPS] Rename SNI_RM200_PCI to just SNI_RM preparing for more RM machines 2006-12-09 01:03:58 +00:00
proc [PATCH] io-accounting: report in procfs 2006-12-10 09:55:41 -08:00
qnx4 [PATCH] struct path: convert qnx4 2006-12-08 08:28:48 -08:00
ramfs [PATCH] struct path: convert ramfs 2006-12-08 08:28:49 -08:00
reiserfs [PATCH] rename struct namespace to struct mnt_namespace 2006-12-08 08:28:51 -08:00
romfs [PATCH] struct path: convert romfs 2006-12-08 08:28:49 -08:00
smbfs [PATCH] struct path: convert smbfs 2006-12-08 08:28:49 -08:00
sysfs [PATCH] sysfs: change uses of f_{dentry, vfsmnt} to use f_path 2006-12-08 08:28:41 -08:00
sysv [PATCH] struct path: convert sysv 2006-12-08 08:28:50 -08:00
udf [PATCH] struct path: convert udf 2006-12-08 08:28:50 -08:00
ufs [PATCH] struct path: convert ufs 2006-12-08 08:28:50 -08:00
vfat [PATCH] fat: add fat_getattr() 2006-11-16 11:43:38 -08:00
xfs [PATCH] xfs: change uses of f_{dentry,vfsmnt} to use f_path 2006-12-08 08:28:43 -08:00
aio.c [PATCH] aio: remove ki_retried debugging member 2006-12-07 08:39:46 -08:00
attr.c [PATCH] capable/capability.h (fs/) 2006-01-11 18:42:13 -08:00
bad_inode.c [PATCH] Remove readv/writev methods and use aio_read/aio_write instead 2006-10-01 00:39:28 -07:00
binfmt_aout.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
binfmt_elf_fdpic.c [PATCH] add process_session() helper routine 2006-12-08 08:28:51 -08:00
binfmt_elf.c [PATCH] add process_session() helper routine 2006-12-08 08:28:51 -08:00
binfmt_em86.c
binfmt_flat.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
binfmt_misc.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
binfmt_script.c
binfmt_som.c [PARISC] Fix fs/binfmt_som.c 2006-10-04 06:51:26 -06:00
bio.c [PATCH] slab: remove kmem_cache_t 2006-12-07 08:39:25 -08:00
block_dev.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
buffer.c [PATCH] io-accounting: write-cancel accounting 2006-12-10 09:55:41 -08:00
char_dev.c [PATCH] BLOCK: Move extern declarations out of fs/*.c into header files [try #6] 2006-09-30 20:52:18 +02:00
compat_ioctl.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
compat.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
dcache.c [PATCH] dcache: avoid RCU for never-hashed dentries 2006-12-07 08:39:41 -08:00
dcookies.c [PATCH] slab: remove kmem_cache_t 2006-12-07 08:39:25 -08:00
direct-io.c [PATCH] dio: formalize bio counters as a dio reference count 2006-12-10 09:57:21 -08:00
dnotify.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
dquot.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
drop_caches.c [PATCH] drop-pagecache 2006-01-08 20:12:40 -08:00
eventpoll.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
exec.c [PATCH] add child reaper to pid_namespace 2006-12-08 08:28:52 -08:00
fcntl.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
fifo.c [PATCH] pipe.c/fifo.c code cleanups 2006-04-11 13:53:33 +02:00
file_table.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
file.c [PATCH] file: kill unnecessary timer in fdtable_defer 2006-12-07 08:39:32 -08:00
filesystems.c [PATCH] Ban register_filesystem(NULL); 2006-09-29 09:18:20 -07:00
fs-writeback.c [PATCH] BLOCK: Remove dependence on existence of blockdev_superblock [try #6] 2006-09-30 20:52:26 +02:00
generic_acl.c [PATCH] Generic infrastructure for acls 2006-09-29 09:18:24 -07:00
inode.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
inotify_user.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
inotify.c [PATCH] severing fs.h, radix-tree.h -> sched.h 2006-12-04 02:00:24 -05:00
internal.h [PATCH] CONFIG_BLOCK internal.h cleanups 2006-09-30 20:52:32 +02:00
ioctl.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
ioprio.c [PATCH] block layer: ioprio_best function fix 2006-10-12 15:09:51 +02:00
Kconfig Fix typos in doc and comments 2006-11-30 05:32:19 +01:00
Kconfig.binfmt [PATCH] frv: suppress configuration of certain features for FRV 2006-01-08 20:13:36 -08:00
libfs.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
locks.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
Makefile [PATCH] fsstack: Introduce fsstack_copy_{attr,inode}_* 2006-12-08 08:28:40 -08:00
mbcache.c [PATCH] slab: remove kmem_cache_t 2006-12-07 08:39:25 -08:00
mpage.c [PATCH] BLOCK: Dissociate generic_writepages() from mpage stuff [try #6] 2006-09-30 20:52:26 +02:00
namei.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
namespace.c [PATCH] rename struct namespace to struct mnt_namespace 2006-12-08 08:28:51 -08:00
nfsctl.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
no-block.c [PATCH] BLOCK: Make it possible to disable the block layer [try #6] 2006-09-30 20:52:31 +02:00
open.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
pipe.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
pnode.c [PATCH] rename struct namespace to struct mnt_namespace 2006-12-08 08:28:51 -08:00
pnode.h [PATCH] rename struct namespace to struct mnt_namespace 2006-12-08 08:28:51 -08:00
posix_acl.c [PATCH] kmemdup: some users 2006-10-01 00:39:19 -07:00
quota_v1.c
quota_v2.c [PATCH] sem2mutex: quota 2006-03-23 07:38:11 -08:00
quota.c [PATCH] BLOCK: Make it possible to disable the block layer [try #6] 2006-09-30 20:52:31 +02:00
read_write.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
read_write.h [PATCH] Remove readv/writev methods and use aio_read/aio_write instead 2006-10-01 00:39:28 -07:00
readdir.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
select.c [PATCH] enforce RLIMIT_NOFILE in poll() 2006-09-29 09:18:23 -07:00
seq_file.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
splice.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
stack.c [PATCH] fsstack: Introduce fsstack_copy_{attr,inode}_* 2006-12-08 08:28:40 -08:00
stat.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
super.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
sync.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
utimes.c [PATCH] severing fs.h, radix-tree.h -> sched.h 2006-12-04 02:00:24 -05:00
xattr_acl.c
xattr.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00