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Omar Sandoval 6ec047a0b8 btrfs: use correct count in btrfs_file_write_iter() 
[ Upstream commit c09767a8960ca0500fb636bf73686723337debf4 ]

generic_write_checks() may modify iov_iter_count(), so we must get the
count after the call, not before. Using the wrong one has a couple of
consequences:

1. We check a longer range in check_can_nocow() for nowait than we're
   actually writing.
2. We create extra hole extent maps in btrfs_cont_expand(). As far as I
   can tell, this is harmless, but I might be missing something.

These issues are pretty minor, but let's fix it before something more
important trips on it.

Fixes: edf064e7c6fe ("btrfs: nowait aio support")
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-27 14:51:12 +01:00
..
tests
btrfs: return error pointer from alloc_test_extent_buffer
2019-12-31 16:36:20 +01:00
acl.c
Btrfs: setup a nofs context for memory allocation at __btrfs_set_acl
2019-03-23 20:10:00 +01:00
async-thread.c
btrfs: don't prematurely free work in run_ordered_work()
2019-12-31 16:36:05 +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
2019-08-25 10:47:54 +02:00
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
2019-02-12 19:47:11 +01:00
check-integrity.c
btrfs: open-code bio_set_op_attrs
2018-08-06 13:12:44 +02:00
check-integrity.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
compression.c
btrfs: correctly validate compression type
2019-09-16 08:22:19 +02:00
compression.h
btrfs: correctly validate compression type
2019-09-16 08:22:19 +02:00
ctree.c
Btrfs: fix removal logic of the tree mod log that leads to use-after-free issues
2019-12-31 16:34:44 +01:00
ctree.h
Btrfs: fix missing data checksums after replaying a log tree
2019-12-31 16:34:42 +01:00
dedupe.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
delayed-inode.c
btrfs: use refcount_inc_not_zero in kill_all_nodes
2019-12-17 20:34:46 +01:00
delayed-inode.h
btrfs: Remove fs_info from btrfs_delete_delayed_dir_index
2018-08-06 13:13:00 +02:00
delayed-ref.c
btrfs: only track ref_heads in delayed_ref_updates
2019-12-05 09:20:23 +01:00
delayed-ref.h
btrfs: Remove fs_info from btrfs_add_delayed_data_ref
2018-08-06 13:12:34 +02:00
dev-replace.c
btrfs: dev-replace: set result code of cancel by status of scrub
2019-12-05 09:20:21 +01:00
dev-replace.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
dir-item.c
btrfs: Remove fs_info from btrfs_insert_delayed_dir_index
2018-08-06 13:13:00 +02:00
disk-io.c
btrfs: don't prematurely free work in end_workqueue_fn()
2019-12-31 16:36:04 +01:00
disk-io.h
btrfs: Check the first key and level for cached extent buffer
2019-05-22 07:37:42 +02:00
export.c
btrfs: replace GPL boilerplate by SPDX -- sources
2018-04-12 16:29:51 +02:00
export.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
extent_io.c
btrfs: return error pointer from alloc_test_extent_buffer
2019-12-31 16:36:20 +01:00
extent_io.h
Btrfs: allow clear_extent_dirty() to receive a cached extent state record
2019-12-05 09:20:22 +01:00
extent_map.c
btrfs: use fs_info for btrfs_handle_em_exist tracepoint
2018-05-28 18:07:17 +02:00
extent_map.h
btrfs: use fs_info for btrfs_handle_em_exist tracepoint
2018-05-28 18:07:17 +02:00
extent-tree.c
Btrfs: fix missing data checksums after replaying a log tree
2019-12-31 16:34:42 +01:00
file-item.c
Btrfs: fix missing data checksums after replaying a log tree
2019-12-31 16:34:42 +01:00
file.c
btrfs: use correct count in btrfs_file_write_iter()
2020-01-27 14:51:12 +01:00
free-space-cache.c
btrfs: check page->mapping when loading free space cache
2019-12-17 20:34:45 +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: Remove fs_info from btrfs_del_root
2018-08-06 13:13:00 +02:00
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: fix inode cache waiters hanging on path allocation failure
2020-01-27 14:51:12 +01:00
inode-map.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
inode.c
btrfs: fix invalid removal of root ref
2020-01-23 08:21:31 +01:00
ioctl.c
btrfs: abort transaction after failed inode updates in create_subvol
2019-12-31 16:34:43 +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: prune unused includes
2018-08-06 13:12:43 +02:00
ordered-data.h
btrfs: remove remaing full_sync logic from btrfs_sync_file
2018-08-06 13:12:31 +02:00
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: correctly validate compression type
2019-09-16 08:22:19 +02:00
props.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
qgroup.c
btrfs: fix memory leak in qgroup accounting
2020-01-23 08:21:31 +01:00
qgroup.h
btrfs: qgroup: Avoid calling qgroup functions if qgroup is not enabled
2018-11-13 11:08:56 -08:00
raid56.c
btrfs: raid56: properly unmap parity page in finish_parity_scrub()
2019-04-03 06:26:21 +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: don't prematurely free work in reada_start_machine_worker()
2019-12-31 16:36:16 +01:00
ref-verify.c
btrfs: fix uninitialized ret in ref-verify
2019-10-17 13:45:27 -07:00
ref-verify.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
relocation.c
btrfs: do not leak reloc root if we fail to read the fs root
2019-12-31 16:34:43 +01:00
root-tree.c
btrfs: do not delete mismatched root refs
2020-01-23 08:21:31 +01:00
scrub.c
btrfs: don't prematurely free work in scrub_missing_raid56_worker()
2019-12-31 16:36:16 +01:00
send.c
btrfs: send: remove WARN_ON for readonly mount
2019-12-31 16:34:42 +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: avoid link error with CONFIG_NO_AUTO_INLINE
2019-12-01 09:17:19 +01:00
sysfs.c
btrfs: sysfs: don't leak memory when failing add fsid
2019-05-31 06:46:02 -07:00
sysfs.h
btrfs: sysfs: Use enum/define value for feature array definitions
2018-05-28 18:23:39 +02:00
transaction.c
Btrfs: fix deadlock between fiemap and transaction commits
2019-08-25 10:47:54 +02:00
transaction.h
Btrfs: fix deadlock between fiemap and transaction commits
2019-08-25 10:47:54 +02:00
tree-checker.c
btrfs: tree-checker: Don't check max block group size as current max chunk size limit is unreliable
2018-12-08 12:59:10 +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: skip log replay on orphaned roots
2019-12-31 16:34:43 +01:00
tree-log.h
Btrfs: sync log after logging new name
2018-08-23 17:37:26 +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: handle ENOENT in btrfs_uuid_tree_iterate
2019-12-31 16:34:44 +01:00
volumes.c
btrfs: fix ncopies raid_attr for RAID56
2019-12-05 09:20:21 +01:00
volumes.h
btrfs: Remove btrfs_bio::flags member
2019-12-17 20:34:48 +01:00
xattr.c
Btrfs: use nofs context when initializing security xattrs to avoid deadlock
2019-01-16 22:04:37 +01:00
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