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linux/fs/btrfs
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David Sterba 1441ed9b7a btrfs: speed up btrfs_get_##bits helpers 
The helpers unconditionally call map_private_extent_buffer to get the
address of page containing the requested offset plus the mapping start
and length. Depending on the return value, the fast path uses unaligned
read to get data within a page, or fall back to read_extent_buffer that
can handle reads spanning more pages.

This is all wasteful. We know the number of bytes to read, 1/2/4/8 and
can find out the page. Then simply check if it's contained or the
fallback is needed.

This saves one function call to map_private_extent_buffer and several
unnecessary temporary variables.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2020-05-25 11:25:32 +02:00
..
tests
btrfs: kill the subvol_srcu
2020-03-23 17:02:00 +01:00
acl.c
btrfs: cleanup btrfs_setxattr_trans and drop transaction parameter
2019-04-29 19:02:44 +02:00
async-thread.c
Btrfs: fix crash during unmount due to race with delayed inode workers
2020-03-23 17:01:51 +01:00
async-thread.h
Btrfs: fix crash during unmount due to race with delayed inode workers
2020-03-23 17:01:51 +01:00
backref.c
btrfs: backref: distinguish reloc and non-reloc use of indirect resolution
2020-05-25 11:25:22 +02:00
backref.h
btrfs: reloc: move error handling of build_backref_tree() to backref.c
2020-05-25 11:25:21 +02:00
block-group.c
btrfs: remove duplicated include in block-group.c
2020-05-25 11:25:31 +02:00
block-group.h
btrfs: move the block group freeze/unfreeze helpers into block-group.c
2020-05-25 11:25:30 +02:00
block-rsv.c
btrfs: force chunk allocation if our global rsv is larger than metadata
2020-05-25 11:25:23 +02:00
block-rsv.h
btrfs: Remove __ prefix from btrfs_block_rsv_release
2020-03-23 17:01:55 +01:00
btrfs_inode.h
btrfs: get rid of one layer of bios in direct I/O
2020-05-25 11:25:26 +02:00
check-integrity.c
btrfs: remove buffer_heads form super block mirror integrity checking
2020-03-23 17:01:40 +01:00
check-integrity.h
btrfs: remove btrfsic_submit_bh()
2020-03-23 17:01:39 +01:00
compression.c
btrfs: use crypto_shash_digest() instead of open coding
2020-05-25 11:25:27 +02:00
compression.h
btrfs: compression: remove ops pointer from workspace_manager
2019-11-18 12:46:59 +01:00
ctree.c
btrfs: don't use set/get token in leaf_space_used
2020-05-25 11:25:32 +02:00
ctree.h
btrfs: preset set/get token with first page and drop condition
2020-05-25 11:25:32 +02:00
delalloc-space.c
btrfs: Remove __ prefix from btrfs_block_rsv_release
2020-03-23 17:01:55 +01:00
delalloc-space.h
btrfs: migrate the delalloc space stuff to it's own home
2019-07-04 17:26:17 +02:00
delayed-inode.c
btrfs: use nofs allocations for running delayed items
2020-03-25 16:26:00 +01:00
delayed-inode.h
btrfs: delayed-inode: Replace zero-length array with flexible-array member
2020-03-23 17:01:53 +01:00
delayed-ref.c
btrfs: Remove __ prefix from btrfs_block_rsv_release
2020-03-23 17:01:55 +01:00
delayed-ref.h
btrfs: migrate the delayed refs rsv code
2019-07-04 17:26:17 +02:00
dev-replace.c
btrfs: sysfs, rename device_link add/remove functions
2020-03-23 17:01:35 +01:00
dev-replace.h
btrfs: add __pure attribute to functions
2019-11-18 12:46:52 +01:00
dir-item.c
btrfs: remove unused parameter fs_info from btrfs_extend_item
2019-04-29 19:02:50 +02:00
discard.c
btrfs: add correction to handle -1 edge case in async discard
2020-01-20 16:41:01 +01:00
discard.h
btrfs: discard: Use the correct style for SPDX License Identifier
2020-04-20 17:43:42 +02:00
disk-io.c
btrfs: use crypto_shash_digest() instead of open coding
2020-05-25 11:25:27 +02:00
disk-io.h
btrfs: get rid of endio_repair_workers
2020-05-25 11:25:27 +02:00
export.c
btrfs: kill the subvol_srcu
2020-03-23 17:02:00 +01:00
export.h
btrfs: export helpers for subvolume name/id resolution
2020-03-23 17:01:42 +01:00
extent_io.c
btrfs: unify buffered and direct I/O read repair
2020-05-25 11:25:27 +02:00
extent_io.h
btrfs: unify buffered and direct I/O read repair
2020-05-25 11:25:27 +02:00
extent_map.c
Btrfs: fix race between using extent maps and merging them
2020-02-12 17:16:46 +01:00
extent_map.h
btrfs: remove extent_map::bdev
2019-11-18 23:43:44 +01:00
extent-io-tree.h
btrfs: switch to per-transaction pinned extents
2020-03-23 17:01:38 +01:00
extent-tree.c
btrfs: rename member 'trimming' of block group to a more generic name
2020-05-25 11:25:29 +02:00
file-item.c
btrfs: use crypto_shash_digest() instead of open coding
2020-05-25 11:25:27 +02:00
file.c
btrfs: make full fsyncs always operate on the entire file again
2020-04-08 19:10:52 +02:00
free-space-cache.c
btrfs: move the block group freeze/unfreeze helpers into block-group.c
2020-05-25 11:25:30 +02:00
free-space-cache.h
btrfs: have multiple discard lists
2020-01-20 16:41:00 +01:00
free-space-tree.c
btrfs: move the root freeing stuff into btrfs_put_root
2020-03-23 17:01:59 +01:00
free-space-tree.h
btrfs: rename btrfs_block_group_cache
2019-11-18 17:51:51 +01:00
inode-item.c
btrfs: Make btrfs_find_name_in_ext_backref return struct btrfs_inode_extref
2019-09-09 14:59:16 +02:00
inode-map.c
btrfs: Remove __ prefix from btrfs_block_rsv_release
2020-03-23 17:01:55 +01:00
inode-map.h
…
inode.c
btrfs: drop eb parameter from set/get token helpers
2020-05-25 11:25:32 +02:00
ioctl.c
btrfs: Remove async_transid from btrfs_mksubvol/create_subvol/create_snapshot
2020-03-23 17:02:00 +01:00
Kconfig
btrfs: add Kconfig dependency for BLAKE2B
2019-12-09 17:56:06 +01:00
locking.c
btrfs: add missing annotation for btrfs_tree_lock()
2020-05-25 11:25:16 +02:00
locking.h
btrfs: Implement DREW lock
2020-03-23 17:01:43 +01:00
lzo.c
btrfs: compression: inline free_workspace
2019-11-18 12:46:59 +01:00
Makefile
Btrfs: move all reflink implementation code into its own file
2020-03-23 17:01:54 +01:00
misc.h
btrfs: rename tree_entry to rb_simple_node and export it
2020-05-25 11:25:19 +02:00
ordered-data.c
btrfs: drop argument tree from btrfs_lock_and_flush_ordered_range
2020-03-23 17:01:34 +01:00
ordered-data.h
btrfs: drop argument tree from btrfs_lock_and_flush_ordered_range
2020-03-23 17:01:34 +01:00
orphan.c
…
print-tree.c
btrfs: Remove unneeded semicolon
2020-01-20 16:40:55 +01:00
print-tree.h
…
props.c
btrfs: Remove __ prefix from btrfs_block_rsv_release
2020-03-23 17:01:55 +01:00
props.h
btrfs: delete unused function btrfs_set_prop_trans
2019-04-29 19:02:54 +02:00
qgroup.c
btrfs: qgroup: mark qgroup inconsistent if we're inherting snapshot to a new qgroup
2020-05-25 11:25:29 +02:00
qgroup.h
btrfs: destroy qgroup extent records on transaction abort
2020-02-19 00:35:54 +01:00
raid56.c
btrfs: use struct_size to calculate size of raid hash table
2020-03-23 17:01:44 +01:00
raid56.h
btrfs: constify map parameter for nr_parity_stripes and nr_data_stripes
2019-07-01 13:34:58 +02:00
rcu-string.h
btrfs: rcu-string: Replace zero-length array with flexible-array member
2020-03-23 17:01:53 +01:00
reada.c
btrfs: rename btrfs_block_group_cache
2019-11-18 17:51:51 +01:00
ref-verify.c
btrfs: fix ref-verify to catch operations on 0 ref extents
2020-03-23 17:01:56 +01:00
ref-verify.h
btrfs: ref-verify: Use btrfs_ref to refactor btrfs_ref_tree_mod()
2019-04-29 19:02:49 +02:00
reflink.c
btrfs: fix lost i_size update after cloning inline extent
2020-04-08 19:10:34 +02:00
reflink.h
Btrfs: move all reflink implementation code into its own file
2020-03-23 17:01:54 +01:00
relocation.c
btrfs: remove the redundant parameter level in btrfs_bin_search()
2020-05-25 11:25:24 +02:00
root-tree.c
btrfs: Remove __ prefix from btrfs_block_rsv_release
2020-03-23 17:01:55 +01:00
scrub.c
btrfs: scrub, only lookup for csums if we are dealing with a data extent
2020-05-25 11:25:30 +02:00
send.c
btrfs: send: emit file capabilities after chown
2020-05-25 11:25:30 +02:00
send.h
…
space-info.c
btrfs: remove pointless assertion on reclaim_size counter
2020-05-25 11:25:23 +02:00
space-info.h
btrfs: improve global reserve stealing logic
2020-05-25 11:25:22 +02:00
struct-funcs.c
btrfs: speed up btrfs_get_##bits helpers
2020-05-25 11:25:32 +02:00
super.c
btrfs: add more codes to decoder table
2020-05-25 11:25:28 +02:00
sysfs.c
btrfs: sysfs: Use scnprintf() instead of snprintf()
2020-03-23 18:14:47 +01:00
sysfs.h
btrfs: sysfs, rename device_link add/remove functions
2020-03-23 17:01:35 +01:00
transaction.c
btrfs: rename member 'trimming' of block group to a more generic name
2020-05-25 11:25:29 +02:00
transaction.h
btrfs: improve global reserve stealing logic
2020-05-25 11:25:22 +02:00
tree-checker.c
btrfs: tree-checker: remove duplicate definition of 'inode_item_err'
2020-05-25 11:25:23 +02:00
tree-checker.h
btrfs: get fs_info from eb in btrfs_check_chunk_valid
2019-04-29 19:02:39 +02:00
tree-defrag.c
btrfs: open code now trivial btrfs_set_lock_blocking
2019-02-25 14:13:27 +01:00
tree-log.c
btrfs: don't use set/get token for single assignment in overwrite_item
2020-05-25 11:25:32 +02:00
tree-log.h
btrfs: get fs_info from trans in btrfs_set_log_full_commit
2019-04-29 19:02:41 +02:00
ulist.c
…
ulist.h
…
uuid-tree.c
btrfs: bail out of uuid tree scanning if we're closing
2020-03-23 17:01:41 +01:00
volumes.c
btrfs: free alien device after device add
2020-05-25 11:25:28 +02:00
volumes.h
btrfs: introduce chunk allocation policy
2020-03-23 17:01:48 +01:00
xattr.c
Btrfs: fix failure to persist compression property xattr deletion on fsync
2019-06-17 16:37:17 +02:00
xattr.h
btrfs: cleanup btrfs_setxattr_trans and drop transaction parameter
2019-04-29 19:02:44 +02:00
zlib.c
btrfs: use larger zlib buffer for s390 hardware compression
2020-01-31 10:30:40 -08:00
zstd.c
btrfs: compression: inline free_workspace
2019-11-18 12:46:59 +01:00