Yan, Zheng 1c4850e21d Btrfs: speed up snapshot dropping ... This patch contains two changes to avoid unnecessary tree block reads during snapshot dropping. First, check tree block's reference count and flags before reading the tree block. if reference count > 1 and there is no need to update backrefs, we can avoid reading the tree block. Second, save when snapshot was created in root_key.offset. we can compare block pointer's generation with snapshot's creation generation during updating backrefs. If a given block was created before snapshot was created, the snapshot can't be the tree block's owner. So we can avoid reading the block. Signed-off-by: Yan Zheng <zheng.yan@oracle.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>		2009-09-21 15:55:59 -04:00
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Kconfig	Btrfs: make btrfs acls selectable	2009-02-04 09:28:28 -05:00
Makefile	Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)	2009-06-10 11:29:46 -04:00
acl.c	helpers for acl caching + switch to those	2009-06-24 08:17:07 -04:00
async-thread.c	Btrfs: Fix async thread shutdown race	2009-09-15 20:20:17 -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	switch btrfs to inode->i_acl	2009-06-24 08:17:05 -04:00
compat.h	Btrfs: drop remaining LINUX_KERNEL_VERSION checks and compat code	2009-01-06 09:38:55 -05:00
compression.c	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable	2009-09-11 19:07:25 -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: improve async block group caching	2009-09-17 15:47:36 -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: improve async block group caching	2009-09-17 15:47:36 -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-tree.c	Btrfs: speed up snapshot dropping	2009-09-21 15:55:59 -04:00
extent_io.c	Btrfs: properly honor wbc->nr_to_write changes	2009-09-18 16:08:46 -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: search for an allocation hint while filling file COW	2009-09-18 16:08:52 -04:00
extent_map.h	Btrfs: search for an allocation hint while filling file COW	2009-09-18 16:08:52 -04:00
file-item.c	Btrfs: leave btree locks spinning more often	2009-03-24 16:14:28 -04:00
file.c	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable	2009-09-11 19:07:25 -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: search for an allocation hint while filling file COW	2009-09-18 16:08:52 -04:00
ioctl.c	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable	2009-09-11 19:07:25 -04:00
ioctl.h	Btrfs: fix ioctl arg size (userland incompatible change!)	2009-01-16 11:59:08 -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
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	headers: smp_lock.h redux	2009-07-12 12:22:34 -07:00
sysfs.c	Btrfs: Fix checkpatch.pl warnings	2009-01-05 21:25:51 -05:00
transaction.c	Btrfs: speed up snapshot dropping	2009-09-21 15:55:59 -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: improve async block group caching	2009-09-17 15:47:36 -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