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35478d053a
linux/fs/btrfs
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Qu Wenruo 35478d053a btrfs: use nodesize to determine if we need readahead in btrfs_lookup_bio_sums 
In btrfs_lookup_bio_sums() if the bio is pretty large, we want to
start readahead in the csum tree.

However the threshold is an immediate number, (PAGE_SIZE * 8), from the
initial btrfs merge.

The meaning of the value is pretty hard to guess, especially when the
immediate number is from the times when 4K sectorsize was the default
and only CRC32C was supported.

For the most common btrfs setup, CRC32 csum and 4K sectorsize,
it means just 32K read would kick readahead, while the csum itself is
only 32 bytes in size.

Now let's be more reasonable by taking both csum size and node size into
consideration.

If the csum size for the bio is larger than one leaf, then we kick the
readahead.  This means for current default btrfs, the threshold will be
16M.

This change should not change performance observably, thus this is
mostly a readability enhancement.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2020-12-08 15:54:14 +01:00
..
tests btrfs: tests: remove invalid extent-io test 2020-12-08 15:54:13 +01:00
acl.c
async-thread.c
async-thread.h
backref.c btrfs: pass root owner to read_tree_block 2020-12-08 15:54:07 +01:00
backref.h
block-group.c btrfs: make btrfs_update_inode take btrfs_inode 2020-12-08 15:54:11 +01:00
block-group.h btrfs: load free space cache asynchronously 2020-12-08 15:54:03 +01:00
block-rsv.c btrfs: introduce mount option rescue=ignorebadroots 2020-12-08 15:53:41 +01:00
block-rsv.h
btrfs_inode.h btrfs: skip unnecessary searches for xattrs when logging an inode 2020-12-08 15:54:12 +01:00
check-integrity.c btrfs: check integrity: remove local copy of csum_size 2020-12-08 15:54:01 +01:00
check-integrity.h
compression.c btrfs: remove unnecessary local variables for checksum size 2020-12-08 15:54:00 +01:00
compression.h btrfs: compression: move declarations to header 2020-10-07 12:06:55 +02:00
ctree.c btrfs: simplify return values in setup_nodes_for_search 2020-12-08 15:54:13 +01:00
ctree.h btrfs: make btrfs_update_inode_fallback take btrfs_inode 2020-12-08 15:54:12 +01:00
delalloc-space.c btrfs: add btrfs_reserve_data_bytes and use it 2020-10-07 12:06:52 +02:00
delalloc-space.h btrfs: make btrfs_delalloc_reserve_space take btrfs_inode 2020-07-27 12:55:36 +02:00
delayed-inode.c btrfs: make btrfs_delayed_update_inode take btrfs_inode 2020-12-08 15:54:10 +01:00
delayed-inode.h btrfs: make btrfs_delayed_update_inode take btrfs_inode 2020-12-08 15:54:10 +01:00
delayed-ref.c btrfs: Remove __ prefix from btrfs_block_rsv_release 2020-03-23 17:01:55 +01:00
delayed-ref.h
dev-replace.c btrfs: remove unused argument seed from btrfs_find_device 2020-12-08 15:54:08 +01:00
dev-replace.h
dir-item.c btrfs: locking: rip out path->leave_spinning 2020-12-08 15:54:02 +01:00
discard.c btrfs: don't miss async discards after scheduled work override 2020-12-08 15:54:05 +01:00
discard.h btrfs: cleanup btrfs_discard_update_discardable usage 2020-12-08 15:54:02 +01:00
disk-io.c btrfs: remove unused parameter phy_offset from btrfs_validate_metadata_buffer 2020-12-08 15:54:14 +01:00
disk-io.h btrfs: remove unused parameter phy_offset from btrfs_validate_metadata_buffer 2020-12-08 15:54:14 +01:00
export.c btrfs: locking: rip out path->leave_spinning 2020-12-08 15:54:02 +01:00
export.h
extent_io.c btrfs: only clear EXTENT_LOCK bit in extent_invalidatepage 2020-12-08 15:54:14 +01:00
extent_io.h btrfs: use fixed width int type for extent_state::state 2020-12-08 15:54:13 +01:00
extent_map.c
extent_map.h btrfs: remove extent_map::bdev 2019-11-18 23:43:44 +01:00
extent-io-tree.h btrfs: use fixed width int type for extent_state::state 2020-12-08 15:54:13 +01:00
extent-tree.c btrfs: set the lockdep class for extent buffers on creation 2020-12-08 15:54:07 +01:00
file-item.c btrfs: use nodesize to determine if we need readahead in btrfs_lookup_bio_sums 2020-12-08 15:54:14 +01:00
file.c btrfs: make btrfs_cont_expand take btrfs_inode 2020-12-08 15:54:12 +01:00
free-space-cache.c btrfs: make btrfs_update_inode take btrfs_inode 2020-12-08 15:54:11 +01:00
free-space-cache.h btrfs: load free space cache into a temporary ctl 2020-12-08 15:54:03 +01:00
free-space-tree.c btrfs: locking: rip out path->leave_spinning 2020-12-08 15:54:02 +01:00
free-space-tree.h
inode-item.c btrfs: locking: rip out path->leave_spinning 2020-12-08 15:54:02 +01:00
inode-map.c btrfs: make btrfs_update_inode take btrfs_inode 2020-12-08 15:54:11 +01:00
inode-map.h
inode.c btrfs: remove unnecessary attempt to drop extent maps after adding inline extent 2020-12-08 15:54:12 +01:00
ioctl.c btrfs: make btrfs_update_inode take btrfs_inode 2020-12-08 15:54:11 +01:00
Kconfig btrfs: switch to iomap for direct IO 2020-10-07 12:06:57 +02:00
locking.c btrfs: remove the recurse parameter from __btrfs_tree_read_lock 2020-12-08 15:54:09 +01:00
locking.h btrfs: remove the recurse parameter from __btrfs_tree_read_lock 2020-12-08 15:54:09 +01:00
lzo.c
Makefile
misc.h
ordered-data.c btrfs: switch cached fs_info::csum_size from u16 to u32 2020-12-08 15:53:59 +01:00
ordered-data.h btrfs: remove unnecessary local variables for checksum size 2020-12-08 15:54:00 +01:00
orphan.c
print-tree.c btrfs: pass root owner to read_tree_block 2020-12-08 15:54:07 +01:00
print-tree.h btrfs: pretty print leaked root name 2020-10-07 12:12:20 +02:00
props.c
props.h
qgroup.c btrfs: pass root owner to read_tree_block 2020-12-08 15:54:07 +01:00
qgroup.h btrfs: qgroup: export qgroups in sysfs 2020-07-27 12:55:37 +02:00
raid56.c btrfs: raid56: remove out label in __raid56_parity_recover 2020-07-27 12:55:44 +02:00
raid56.h
rcu-string.h
reada.c btrfs: pass the owner_root and level to alloc_extent_buffer 2020-12-08 15:54:07 +01:00
ref-verify.c btrfs: use btrfs_read_node_slot in walk_down_tree 2020-12-08 15:54:06 +01:00
ref-verify.h
reflink.c btrfs: make btrfs_cont_expand take btrfs_inode 2020-12-08 15:54:12 +01:00
reflink.h
relocation.c btrfs: pass the owner_root and level to alloc_extent_buffer 2020-12-08 15:54:07 +01:00
root-tree.c btrfs: qgroup: fix qgroup meta rsv leak for subvolume operations 2020-10-07 12:12:13 +02:00
scrub.c btrfs: scrub: remove the anonymous structure from scrub_page 2020-12-08 15:54:14 +01:00
send.c btrfs: send: use helpers to access root_item::ctransid 2020-12-08 15:53:51 +01:00
send.h btrfs: send: avoid copying file data 2020-10-07 12:13:17 +02:00
space-info.c btrfs: kill the RCU protection for fs_info->space_info 2020-10-07 12:13:19 +02:00
space-info.h btrfs: add btrfs_reserve_data_bytes and use it 2020-10-07 12:06:52 +02:00
struct-funcs.c btrfs: use unaligned helpers for stack and header set/get helpers 2020-10-07 12:13:23 +02:00
super.c btrfs: locking: rip out path->leave_spinning 2020-12-08 15:54:02 +01:00
sysfs.c btrfs: sysfs: remove unneeded semicolon 2020-12-08 15:54:13 +01:00
sysfs.h btrfs: split and refactor btrfs_sysfs_remove_devices_dir 2020-10-07 12:12:21 +02:00
transaction.c btrfs: make btrfs_update_inode_fallback take btrfs_inode 2020-12-08 15:54:12 +01:00
transaction.h btrfs: remove dio iomap DSYNC workaround 2020-12-08 15:53:49 +01:00
tree-checker.c btrfs: switch cached fs_info::csum_size from u16 to u32 2020-12-08 15:53:59 +01:00
tree-checker.h
tree-defrag.c btrfs: locking: remove all the blocking helpers 2020-12-08 15:54:01 +01:00
tree-log.c btrfs: stop incrementing log batch when joining log transaction 2020-12-08 15:54:12 +01:00
tree-log.h btrfs: make fast fsyncs wait only for writeback 2020-10-07 12:06:56 +02:00
ulist.c
ulist.h
uuid-tree.c btrfs: remove unnecessary casts in printk 2020-12-08 15:53:52 +01:00
volumes.c btrfs: remove unused argument seed from btrfs_find_device 2020-12-08 15:54:08 +01:00
volumes.h btrfs: remove unused argument seed from btrfs_find_device 2020-12-08 15:54:08 +01:00
xattr.c btrfs: skip unnecessary searches for xattrs when logging an inode 2020-12-08 15:54:12 +01:00
xattr.h
zlib.c
zstd.c