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135da9766e
linux/fs/btrfs
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Qu Wenruo 135da9766e btrfs: volumes: Add comment for find_free_dev_extent_start() 
Since commit 6df9a95e63 ("Btrfs: make the chunk allocator completely
tree lockless") we search commit root of device tree to avoid deadlock.

This introduced a safety feature, find_free_dev_extent_start() won't
use dev extents which just get freed in current transaction.

This safety feature makes sure we won't allocate new block group using
just freed dev extents to break CoW.

However, this feature also makes find_free_dev_extent_start() not
reliable reporting free device space.  Just add such comment to make
later viewer careful about this behavior.

This behavior makes one caller, btrfs_can_relocate() unreliable
determining the device free space.

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2019-09-09 14:59:00 +02:00
..
tests btrfs: Remove leftover of in-band dedupe 2019-09-09 14:58:59 +02:00
acl.c btrfs: cleanup btrfs_setxattr_trans and drop transaction parameter 2019-04-29 19:02:44 +02:00
async-thread.c btrfs: simplify workqueue name when allocating 2019-02-25 14:13:24 +01:00
async-thread.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
backref.c Btrfs: fix deadlock between fiemap and transaction commits 2019-07-30 18:25:12 +02:00
backref.h btrfs: fiemap: preallocate ulists for btrfs_check_shared 2019-07-01 13:34:53 +02:00
block-rsv.c btrfs: migrate the global_block_rsv helpers to block-rsv.c 2019-07-02 12:30:55 +02:00
block-rsv.h btrfs: migrate the global_block_rsv helpers to block-rsv.c 2019-07-02 12:30:55 +02:00
btrfs_inode.h btrfs: remove assumption about csum type form btrfs_print_data_csum_error() 2019-07-01 13:35:02 +02:00
check-integrity.c btrfs: reduce stack usage for btrfsic_process_written_block 2019-09-09 14:58:58 +02:00
check-integrity.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
compression.c btrfs: lift bio_set_dev from bio allocation helpers 2019-07-02 12:30:51 +02:00
compression.h btrfs: correctly validate compression type 2019-07-02 12:30:48 +02:00
ctree.c btrfs: assert tree mod log lock in __tree_mod_log_insert 2019-09-09 14:59:00 +02:00
ctree.h btrfs: Remove leftover of in-band dedupe 2019-09-09 14:58:59 +02:00
delalloc-space.c btrfs: migrate the delalloc space stuff to it's own home 2019-07-04 17:26:17 +02:00
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: get fs_info from eb in btrfs_leaf_free_space 2019-04-29 19:02:30 +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: migrate the delayed refs rsv code 2019-07-04 17:26:17 +02:00
delayed-ref.h btrfs: migrate the delayed refs rsv code 2019-07-04 17:26:17 +02:00
dev-replace.c btrfs: remove mapping tree structures indirection 2019-07-01 13:34:56 +02:00
dev-replace.h btrfs: get fs_info from trans in btrfs_run_dev_replace 2019-04-29 19:02:43 +02:00
dir-item.c btrfs: remove unused parameter fs_info from btrfs_extend_item 2019-04-29 19:02:50 +02:00
disk-io.c Btrfs: fix sysfs warning and missing raid sysfs directories 2019-08-07 16:25:44 +02:00
disk-io.h btrfs: directly call into crypto framework for checksumming 2019-07-01 13:35:02 +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: Remove delalloc_end argument from extent_clear_unlock_delalloc 2019-09-09 14:58:59 +02:00
extent_io.h btrfs: Remove delalloc_end argument from extent_clear_unlock_delalloc 2019-09-09 14:58:59 +02:00
extent_map.c btrfs: assert extent map tree lock in add_extent_mapping 2019-09-09 14:59:00 +02:00
extent_map.h btrfs: Remove impossible condition from mergable_maps 2019-02-25 14:13:21 +01:00
extent-tree.c btrfs: trim: Check the range passed into to prevent overflow 2019-08-07 16:42:39 +02:00
file-item.c btrfs: directly call into crypto framework for checksumming 2019-07-01 13:35:02 +02:00
file.c btrfs: Remove leftover of in-band dedupe 2019-09-09 14:58:59 +02:00
free-space-cache.c btrfs: migrate the delalloc space stuff to it's own home 2019-07-04 17:26:17 +02:00
free-space-cache.h btrfs: get fs_info from block group in btrfs_find_space_cluster 2019-04-29 19:02:46 +02:00
free-space-tree.c btrfs: get fs_info from block group in search_free_space_info 2019-04-29 19:02:46 +02:00
free-space-tree.h btrfs: get fs_info from block group in search_free_space_info 2019-04-29 19:02:46 +02:00
inode-item.c btrfs: remove unused parameter fs_info from btrfs_extend_item 2019-04-29 19:02:50 +02:00
inode-map.c btrfs: migrate the delalloc space stuff to it's own home 2019-07-04 17:26:17 +02:00
inode-map.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
inode.c btrfs: Add an assertion to warn incorrect case in insert_inline_extent() 2019-09-09 14:59:00 +02:00
ioctl.c btrfs: use common vfs LABEL ioctl definitions 2019-09-09 14:58:59 +02:00
Kconfig btrfs: Fix build error while LIBCRC32C is module 2019-07-17 17:03:30 +02:00
locking.c btrfs: Remove unused locking functions 2019-09-09 14:58:59 +02:00
locking.h btrfs: Remove unused locking functions 2019-09-09 14:58:59 +02:00
lzo.c btrfs: change set_level() to bound the level passed in 2019-02-25 14:13:32 +01:00
Makefile btrfs: migrate the delalloc space stuff to it's own home 2019-07-04 17:26:17 +02:00
math.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
ordered-data.c btrfs: fix extent_state leak in btrfs_lock_and_flush_ordered_range 2019-07-26 12:21:22 +02:00
ordered-data.h btrfs: don't assume ordered sums to be 4 bytes 2019-07-01 13:35:00 +02:00
orphan.c btrfs: replace GPL boilerplate by SPDX -- sources 2018-04-12 16:29:51 +02:00
print-tree.c btrfs: switch extent_buffer write_locks from atomic to int 2019-07-02 12:30:47 +02:00
print-tree.h btrfs: print-tree: debugging output enhancement 2018-04-20 19:18:16 +02:00
props.c btrfs: shut up bogus -Wmaybe-uninitialized warning 2019-07-02 12:30:49 +02:00
props.h btrfs: delete unused function btrfs_set_prop_trans 2019-04-29 19:02:54 +02:00
qgroup.c btrfs: qgroup: Don't hold qgroup_ioctl_lock in btrfs_qgroup_inherit() 2019-07-02 12:30:48 +02:00
qgroup.h btrfs: qgroup: Move reserved data accounting from btrfs_delayed_ref_head to btrfs_qgroup_extent_record 2019-02-25 14:13:39 +01:00
raid56.c block: remove the i argument to bio_for_each_segment_all 2019-04-30 09:26:13 -06:00
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: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
reada.c btrfs: start readahead also in seed devices 2019-06-14 17:33:46 +02:00
ref-verify.c Wimplicit-fallthrough patches for 5.2-rc1 2019-05-07 12:48:10 -07:00
ref-verify.h btrfs: ref-verify: Use btrfs_ref to refactor btrfs_ref_tree_mod() 2019-04-29 19:02:49 +02:00
relocation.c btrfs: Remove leftover of in-band dedupe 2019-09-09 14:58:59 +02:00
root-tree.c btrfs: move the subvolume reservation stuff out of extent-tree.c 2019-07-04 17:26:18 +02:00
scrub.c btrfs: add mask for all RAID1 types 2019-07-02 12:30:48 +02:00
send.c Btrfs: fix incremental send failure after deduplication 2019-07-30 18:25:11 +02:00
send.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
space-info.c btrfs: Simplify update of space_info in __reserve_metadata_bytes() 2019-07-02 12:30:53 +02:00
space-info.h btrfs: unexport can_overcommit 2019-07-02 12:30:53 +02:00
struct-funcs.c btrfs: prune unused includes 2018-08-06 13:12:43 +02:00
super.c btrfs: move space_info to space-info.h 2019-07-02 12:30:51 +02:00
sysfs.c for-5.3-tag 2019-07-16 15:12:56 -07:00
sysfs.h btrfs: drop extra enum initialization where using defaults 2018-12-17 14:51:43 +01:00
transaction.c Btrfs: fix deadlock between fiemap and transaction commits 2019-07-30 18:25:12 +02:00
transaction.h Btrfs: fix deadlock between fiemap and transaction commits 2019-07-30 18:25:12 +02:00
tree-checker.c btrfs: tree-checker: Check if the file extent end overflows 2019-07-01 13:34:55 +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: fix fsync not persisting dentry deletions due to inode evictions 2019-07-02 12:30:50 +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 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 unused parameter fs_info from btrfs_extend_item 2019-04-29 19:02:50 +02:00
volumes.c btrfs: volumes: Add comment for find_free_dev_extent_start() 2019-09-09 14:59:00 +02:00
volumes.h btrfs: volumes: Unexport find_free_dev_extent_start() 2019-09-09 14:59:00 +02:00
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: change set_level() to bound the level passed in 2019-02-25 14:13:32 +01:00
zstd.c btrfs: correct zstd workspace manager lock to use spin_lock_bh() 2019-05-28 18:54:09 +02:00