linux/fs/btrfs
Chris Mason 8b62b72b26 Btrfs: Use PagePrivate2 to track pages in the data=ordered code.
Btrfs writes go through delalloc to the data=ordered code.  This
makes sure that all of the data is on disk before the metadata
that references it.  The tracking means that we have to make sure
each page in an extent is fully written before we add that extent into
the on-disk btree.

This was done in the past by setting the EXTENT_ORDERED bit for the
range of an extent when it was added to the data=ordered code, and then
clearing the EXTENT_ORDERED bit in the extent state tree as each page
finished IO.

One of the reasons we had to do this was because sometimes pages are
magically dirtied without page_mkwrite being called.  The EXTENT_ORDERED
bit is checked at writepage time, and if it isn't there, our page become
dirty without going through the proper path.

These bit operations make for a number of rbtree searches for each page,
and can cause considerable lock contention.

This commit switches from the EXTENT_ORDERED bit to use PagePrivate2.
As pages go into the ordered code, PagePrivate2 is set on each one.
This is a cheap operation because we already have all the pages locked
and ready to go.

As IO finishes, the PagePrivate2 bit is cleared and the ordered
accoutning is updated for each page.

At writepage time, if the PagePrivate2 bit is missing, we go into the
writepage fixup code to handle improperly dirtied pages.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-09-11 13:31:07 -04:00
..
acl.c Fix btrfs when ACLs are configured out 2009-06-10 11:36:43 -04:00
async-thread.c Btrfs: reduce worker thread spin_lock_irq hold times 2009-09-11 13:31:04 -04:00
async-thread.h Btrfs: keep irqs on more often in the worker threads 2009-09-11 13:31:04 -04:00
btrfs_inode.h Btrfs: implement FS_IOC_GETFLAGS/SETFLAGS/GETVERSION 2009-06-10 11:29:52 -04:00
compat.h Btrfs: drop remaining LINUX_KERNEL_VERSION checks and compat code 2009-01-06 09:38:55 -05:00
compression.c Btrfs: switch extent_map to a rw lock 2009-09-11 13:31:05 -04:00
compression.h Btrfs: Add zlib compression support 2008-10-29 14:49:59 -04:00
ctree.c Btrfs: Avoid delayed reference update looping 2009-07-24 12:42:46 -04:00
ctree.h Btrfs: preserve commit_root for async caching 2009-07-30 09:40:40 -04:00
delayed-ref.c Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE) 2009-06-10 11:29:46 -04:00
delayed-ref.h Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE) 2009-06-10 11:29:46 -04:00
dir-item.c Btrfs: leave btree locks spinning more often 2009-03-24 16:14:28 -04:00
disk-io.c Btrfs: switch extent_map to a rw lock 2009-09-11 13:31:05 -04:00
disk-io.h Btrfs: leave btree locks spinning more often 2009-03-24 16:14:28 -04:00
export.c Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE) 2009-06-10 11:29:46 -04:00
export.h NFS support for btrfs - v3 2008-09-25 11:04:06 -04:00
extent_io.c Btrfs: Use PagePrivate2 to track pages in the data=ordered code. 2009-09-11 13:31:07 -04:00
extent_io.h Btrfs: Use PagePrivate2 to track pages in the data=ordered code. 2009-09-11 13:31:07 -04:00
extent_map.c Btrfs: switch extent_map to a rw lock 2009-09-11 13:31:05 -04:00
extent_map.h Btrfs: switch extent_map to a rw lock 2009-09-11 13:31:05 -04:00
extent-tree.c Btrfs: switch extent_map to a rw lock 2009-09-11 13:31:05 -04:00
file-item.c Btrfs: leave btree locks spinning more often 2009-03-24 16:14:28 -04:00
file.c Btrfs: reduce CPU usage in the extent_state tree 2009-09-11 13:31:06 -04:00
free-space-cache.c Btrfs: fix btrfs_remove_from_free_space corner case 2009-07-31 11:03:58 -04:00
free-space-cache.h Btrfs: use hybrid extents+bitmap rb tree for free space 2009-07-24 09:23:30 -04:00
hash.h Btrfs: remove crc32c.h and use libcrc32c directly. 2009-06-10 11:29:53 -04:00
inode-item.c Btrfs: leave btree locks spinning more often 2009-03-24 16:14:28 -04:00
inode-map.c Btrfs: Fix a trivial warning using max() of u64 vs ULL. 2009-04-27 08:37:49 -04:00
inode.c Btrfs: Use PagePrivate2 to track pages in the data=ordered code. 2009-09-11 13:31:07 -04:00
ioctl.c Btrfs: fix the file clone ioctl for preallocated extents 2009-07-02 13:41:16 -04:00
ioctl.h Btrfs: fix ioctl arg size (userland incompatible change!) 2009-01-16 11:59:08 -05:00
Kconfig Btrfs: make btrfs acls selectable 2009-02-04 09:28:28 -05:00
locking.c Btrfs: fix typos in comments 2009-04-02 16:46:06 -04:00
locking.h Btrfs: fix spinlock assertions on UP systems 2009-03-09 11:45:38 -04:00
Makefile Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE) 2009-06-10 11:29:46 -04:00
ordered-data.c Btrfs: Use PagePrivate2 to track pages in the data=ordered code. 2009-09-11 13:31:07 -04:00
ordered-data.h Btrfs: Use PagePrivate2 to track pages in the data=ordered code. 2009-09-11 13:31:07 -04:00
orphan.c Btrfs: Create orphan inode records to prevent lost files after a crash 2008-09-25 11:04:05 -04:00
print-tree.c Btrfs: remove of redundant btrfs_header_level 2009-07-22 16:52:13 -04:00
print-tree.h Btrfs: Create extent_buffer interface for large blocksizes 2008-09-25 11:03:56 -04:00
ref-cache.c Btrfs: Make btrfs_drop_snapshot work in larger and more efficient chunks 2009-02-04 09:27:02 -05:00
ref-cache.h Btrfs: Make btrfs_drop_snapshot work in larger and more efficient chunks 2009-02-04 09:27:02 -05:00
relocation.c Btrfs: use a cached state for extent state operations during delalloc 2009-09-11 13:31:07 -04:00
root-tree.c Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE) 2009-06-10 11:29:46 -04:00
struct-funcs.c Btrfs: Fix checkpatch.pl warnings 2009-01-05 21:25:51 -05:00
super.c Btrfs: fix -o nodatasum printk spelling 2009-06-11 09:30:13 -04:00
sysfs.c Btrfs: Fix checkpatch.pl warnings 2009-01-05 21:25:51 -05:00
transaction.c Btrfs: be more polite in the async caching threads 2009-07-30 10:14:46 -04:00
transaction.h Btrfs: be more polite in the async caching threads 2009-07-30 10:14:46 -04:00
tree-defrag.c Btrfs: do extent allocation and reference count updates in the background 2009-03-24 16:14:25 -04:00
tree-log.c Btrfs: change how we unpin extents 2009-07-27 13:57:01 -04:00
tree-log.h Btrfs: tree logging unlink/rename fixes 2009-03-24 16:14:52 -04:00
version.h Update Btrfs files for in-kernel usage 2008-09-25 15:41:59 -04:00
version.sh Btrfs: Fixes for 2.6.28-rc API changes 2008-11-19 21:17:22 -05:00
volumes.c Btrfs: switch extent_map to a rw lock 2009-09-11 13:31:05 -04:00
volumes.h Btrfs: avoid races between super writeout and device list updates 2009-06-10 15:17:02 -04:00
xattr.c Btrfs: selinux support 2009-02-04 09:29:13 -05:00
xattr.h Btrfs: selinux support 2009-02-04 09:29:13 -05:00
zlib.c Btrfs: correct error-handling zlib error handling 2009-08-07 13:51:33 -04:00