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d2e174d5d3eedb3b9dd97167307bf1f01bd2fa5c
android_kernel_xiaomi_sm8450/fs/btrfs
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Johannes Thumshirn d2e174d5d3 btrfs: document extent mapping assumptions in checksum 
Document why map_private_extent_buffer() cannot return '1' (i.e. the map
spans two pages) for the csum_tree_block() case.

The current algorithm for detecting a page boundary crossing in
map_private_extent_buffer() will return a '1' *IFF* the extent buffer's
offset in the page + the offset passed in by csum_tree_block() and the
minimal length passed in by csum_tree_block() - 1 are bigger than
PAGE_SIZE.

We always pass BTRFS_CSUM_SIZE (32) as offset and a minimal length of 32
and the current extent buffer allocator always guarantees page aligned
extends, so the above condition can't be true.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
2018-12-17 14:51:41 +01:00
..
tests
btrfs: use EXPORT_FOR_TESTS for conditionally exported functions
2018-12-17 14:51:37 +01:00
acl.c
btrfs: remove unnecessary curly braces in btrfs_get_acl
2018-08-06 13:12:41 +02:00
async-thread.c
btrfs: replace GPL boilerplate by SPDX -- sources
2018-04-12 16:29:51 +02:00
async-thread.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
backref.c
btrfs: Remove needless tree locking in iterate_inode_extrefs
2018-12-17 14:51:30 +01:00
backref.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
btrfs_inode.h
btrfs: use tagged writepage to mitigate livelock of snapshot
2018-12-17 14:51:33 +01:00
check-integrity.c
btrfs: Remove fsid/metadata_fsid fields from btrfs_info
2018-12-17 14:51:37 +01:00
check-integrity.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
compression.c
btrfs: Remove unused extent_state argument from btrfs_writepage_endio_finish_ordered
2018-12-17 14:51:32 +01:00
compression.h
btrfs: compression: Add linux/sizes.h for compression.h
2018-05-29 18:13:00 +02:00
ctree.c
btrfs: Remove fsid/metadata_fsid fields from btrfs_info
2018-12-17 14:51:37 +01:00
ctree.h
btrfs: Remove fsid/metadata_fsid fields from btrfs_info
2018-12-17 14:51:37 +01:00
dedupe.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
delayed-inode.c
Btrfs: kill btrfs_clear_path_blocking
2018-10-15 17:23:38 +02:00
delayed-inode.h
Btrfs: delayed-inode: use rb_first_cached for ins_root and del_root
2018-10-15 17:23:33 +02:00
delayed-ref.c
btrfs: delayed-ref: extract find_first_ref_head from find_ref_head
2018-10-17 19:21:00 +02:00
delayed-ref.h
btrfs: delayed-ref: pass delayed_refs directly to btrfs_delayed_ref_lock
2018-10-15 17:23:41 +02:00
dev-replace.c
btrfs: don't report user-requested cancel as an error
2018-12-17 14:51:36 +01:00
dev-replace.h
btrfs: mark btrfs_dev_replace_start as static
2018-12-17 14:51:34 +01:00
dir-item.c
btrfs: Remove root parameter from btrfs_insert_dir_item
2018-10-15 17:23:25 +02:00
disk-io.c
btrfs: document extent mapping assumptions in checksum
2018-12-17 14:51:41 +01:00
disk-io.h
btrfs: unify end_io callbacks of async_submit_bio
2018-08-06 13:12:55 +02:00
export.c
btrfs: Remove 'objectid' member from struct btrfs_root
2018-10-15 17:23:25 +02:00
export.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
extent_io.c
btrfs: don't initialize 'offset' in map_private_extent_buffer()
2018-12-17 14:51:41 +01:00
extent_io.h
btrfs: Remove extent_io_ops::readpage_io_failed_hook
2018-12-17 14:51:41 +01:00
extent_map.c
Btrfs: extent_map: use rb_first_cached
2018-10-15 17:23:33 +02:00
extent_map.h
Btrfs: extent_map: use rb_first_cached
2018-10-15 17:23:33 +02:00
extent-tree.c
Btrfs: allow clear_extent_dirty() to receive a cached extent state record
2018-12-17 14:51:38 +01:00
file-item.c
btrfs: replace btrfs_io_bio::end_io with a simple helper
2018-12-17 14:51:40 +01:00
file.c
Btrfs: remove no longer used io_err from btrfs_log_ctx
2018-12-17 14:51:31 +01:00
free-space-cache.c
Btrfs: fix deadlock on tree root leaf when finding free extent
2018-11-06 16:42:32 +01:00
free-space-cache.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
free-space-tree.c
btrfs: use EXPORT_FOR_TESTS for conditionally exported functions
2018-12-17 14:51:37 +01:00
free-space-tree.h
btrfs: Remove fs_info argument from add_to_free_space_tree
2018-05-28 18:07:36 +02:00
inode-item.c
btrfs: replace GPL boilerplate by SPDX -- sources
2018-04-12 16:29:51 +02:00
inode-map.c
btrfs: prune unused includes
2018-08-06 13:12:43 +02:00
inode-map.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
inode.c
btrfs: Remove extent_io_ops::readpage_io_failed_hook
2018-12-17 14:51:41 +01:00
ioctl.c
btrfs: Remove fsid/metadata_fsid fields from btrfs_info
2018-12-17 14:51:37 +01:00
Kconfig
btrfs: add SPDX header to Kconfig
2018-04-12 16:29:55 +02:00
locking.c
btrfs: replace waitqueue_actvie with cond_wake_up
2018-05-28 18:23:09 +02:00
locking.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
lzo.c
btrfs: lzo: Harden inline lzo compressed extent decompression
2018-05-30 16:46:43 +02:00
Makefile
btrfs: Remove custom crc32c init code
2018-03-26 15:09:39 +02:00
math.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
ordered-data.c
Btrfs: remove no longer used stuff for tracking pending ordered extents
2018-12-17 14:51:25 +01:00
ordered-data.h
Btrfs: remove no longer used stuff for tracking pending ordered extents
2018-12-17 14:51:25 +01:00
orphan.c
btrfs: replace GPL boilerplate by SPDX -- sources
2018-04-12 16:29:51 +02:00
print-tree.c
btrfs: annotate unlikely branches after V0 extent type removal
2018-08-06 13:12:41 +02:00
print-tree.h
btrfs: print-tree: debugging output enhancement
2018-04-20 19:18:16 +02:00
props.c
btrfs: property: Set incompat flag if lzo/zstd compression is set
2018-05-17 14:18:25 +02:00
props.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
qgroup.c
Btrfs: fix deadlock when enabling quotas due to concurrent snapshot creation
2018-12-17 14:51:39 +01:00
qgroup.h
btrfs: qgroup: Avoid calling qgroup functions if qgroup is not enabled
2018-10-15 17:23:40 +02:00
raid56.c
btrfs: raid56: catch errors from full_stripe_write
2018-08-06 13:12:45 +02:00
raid56.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
rcu-string.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
reada.c
btrfs: prune unused includes
2018-08-06 13:12:43 +02:00
ref-verify.c
btrfs: Remove 'objectid' member from struct btrfs_root
2018-10-15 17:23:25 +02:00
ref-verify.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
relocation.c
btrfs: add helper to describe block group flags
2018-12-17 14:51:39 +01:00
root-tree.c
btrfs: Remove fs_info from btrfs_add_root_ref
2018-08-06 13:13:00 +02:00
scrub.c
Btrfs: fix deadlock with memory reclaim during scrub
2018-12-17 14:51:41 +01:00
send.c
Btrfs: send, fix infinite loop due to directory rename dependencies
2018-11-21 17:03:50 +01:00
send.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
struct-funcs.c
btrfs: prune unused includes
2018-08-06 13:12:43 +02:00
super.c
btrfs: Remove fsid/metadata_fsid fields from btrfs_info
2018-12-17 14:51:37 +01:00
sysfs.c
btrfs: Add sysfs support for metadata_uuid feature
2018-12-17 14:51:37 +01:00
sysfs.h
btrfs: sysfs: Use enum/define value for feature array definitions
2018-05-28 18:23:39 +02:00
transaction.c
Btrfs: remove no longer used stuff for tracking pending ordered extents
2018-12-17 14:51:25 +01:00
transaction.h
Btrfs: remove no longer used stuff for tracking pending ordered extents
2018-12-17 14:51:25 +01:00
tree-checker.c
btrfs: tree-checker: Don't check max block group size as current max chunk size limit is unreliable
2018-12-04 15:05:30 +01:00
tree-checker.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
tree-defrag.c
btrfs: replace GPL boilerplate by SPDX -- sources
2018-04-12 16:29:51 +02:00
tree-log.c
Btrfs: simpler and more efficient cleanup of a log tree's extent io tree
2018-12-17 14:51:31 +01:00
tree-log.h
Btrfs: remove no longer used io_err from btrfs_log_ctx
2018-12-17 14:51:31 +01:00
ulist.c
btrfs: replace GPL boilerplate by SPDX -- sources
2018-04-12 16:29:51 +02:00
ulist.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
uuid-tree.c
btrfs: Remove fs_info argument from btrfs_uuid_tree_rem
2018-05-30 16:46:53 +02:00
volumes.c
btrfs: balance: print to system log when balance ends or is paused
2018-12-17 14:51:39 +01:00
volumes.h
btrfs: remove btrfs_bio_end_io_t
2018-12-17 14:51:40 +01:00
xattr.c
btrfs: replace GPL boilerplate by SPDX -- sources
2018-04-12 16:29:51 +02:00
xattr.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
zlib.c
btrfs: replace GPL boilerplate by SPDX -- sources
2018-04-12 16:29:51 +02:00
zstd.c
btrfs: replace GPL boilerplate by SPDX -- sources
2018-04-12 16:29:51 +02:00