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linux/fs/btrfs
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David Sterba 88c14590cd btrfs: use RCU in btrfs_show_devname for device list traversal 
The show_devname callback is used to print device name in
/proc/self/mounts, we need to traverse the device list consistently and
read the name that's copied to a seq buffer so we don't need further
locking.

If the first device is being deleted at the same time, the RCU will
allow us to read the device name, though it will become stale right
after the RCU protection ends. This is unavoidable and the user can
expect that the device will disappear from the filesystem's list at some
point.

The device_list_mutex was pretty heavy as it is used eg. for writing
superblock and a few other IO related contexts. This can stall any
application that reads the proc file for no reason.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2018-03-31 02:01:06 +02:00
..
tests
btrfs: tests/qgroup: Fix wrong tree backref level
2018-03-31 02:01:05 +02:00
acl.c
btrfs: drop underscores from exported xattr functions
2018-03-26 15:09:41 +02:00
async-thread.c
Btrfs: fix confusing worker helper info in stacktrace
2017-10-30 12:27:57 +01:00
async-thread.h
btrfs: constify tracepoint arguments
2017-08-16 14:19:53 +02:00
backref.c
btrfs: Validate child tree block's level and first key
2018-03-31 02:01:06 +02:00
backref.h
btrfs: add more __cold annotations
2018-03-26 15:09:39 +02:00
btrfs_inode.h
btrfs: open code trivial helper btrfs_page_exists_in_range
2018-03-31 01:26:50 +02:00
check-integrity.c
btrfs: Remove custom crc32c init code
2018-03-26 15:09:39 +02:00
check-integrity.h
btrfs: take an fs_info directly when the root is not used otherwise
2016-12-06 16:06:59 +01:00
compression.c
btrfs: add more __cold annotations
2018-03-26 15:09:39 +02:00
compression.h
btrfs: add more __cold annotations
2018-03-26 15:09:39 +02:00
ctree.c
btrfs: update barrier in should_cow_block
2018-03-31 02:01:06 +02:00
ctree.h
btrfs: qgroup: Use root::qgroup_meta_rsv_* to record qgroup meta reserved space
2018-03-31 02:01:04 +02:00
dedupe.h
btrfs: expand cow_file_range() to support in-band dedup and subpage-blocksize
2016-07-26 13:52:25 +02:00
delayed-inode.c
btrfs: delayed-inode: Use new qgroup meta rsv for delayed inode and item
2018-03-31 02:01:03 +02:00
delayed-inode.h
btrfs: add more __cold annotations
2018-03-26 15:09:39 +02:00
delayed-ref.c
btrfs: use lockdep_assert_held for spinlocks
2018-03-31 02:01:06 +02:00
delayed-ref.h
btrfs: add more __cold annotations
2018-03-26 15:09:39 +02:00
dev-replace.c
btrfs: log, when replace, is canceled by the user
2018-03-26 15:09:34 +02:00
dev-replace.h
btrfs: btrfs_dev_replace_cancel() can return int
2018-03-26 15:09:30 +02:00
dir-item.c
btrfs: Remove custom crc32c init code
2018-03-26 15:09:39 +02:00
disk-io.c
btrfs: Validate child tree block's level and first key
2018-03-31 02:01:06 +02:00
disk-io.h
btrfs: Validate child tree block's level and first key
2018-03-31 02:01:06 +02:00
export.c
btrfs: Cleanup existing name_len checks
2018-01-22 16:08:12 +01:00
export.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
extent_io.c
btrfs: document more parameters of submit_extent_page
2018-03-31 01:26:53 +02:00
extent_io.h
btrfs: remove unused parameters from extent_submit_bio_done_t
2018-03-31 01:26:55 +02:00
extent_map.c
btrfs: add more __cold annotations
2018-03-26 15:09:39 +02:00
extent_map.h
btrfs: add more __cold annotations
2018-03-26 15:09:39 +02:00
extent-tree.c
btrfs: use lockdep_assert_held for mutexes
2018-03-31 02:01:06 +02:00
file-item.c
Merge branch 'for-4.13-part1' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
2017-07-05 16:41:23 -07:00
file.c
btrfs: qgroup: Use separate meta reservation type for delalloc
2018-03-31 01:41:14 +02:00
free-space-cache.c
btrfs: qgroup: Use separate meta reservation type for delalloc
2018-03-31 01:41:14 +02:00
free-space-cache.h
btrfs: free-space-cache, clean up unnecessary root arguments
2017-02-17 12:03:56 +01:00
free-space-tree.c
btrfs: use reada direction enum instead of constant value in load_free_space_tree
2018-03-26 15:09:37 +02:00
free-space-tree.h
btrfs: expose internal free space tree routine only if sanity tests are enabled
2017-08-18 16:36:29 +02:00
inode-item.c
btrfs: Remove custom crc32c init code
2018-03-26 15:09:39 +02:00
inode-map.c
btrfs: qgroup: Use separate meta reservation type for delalloc
2018-03-31 01:41:14 +02:00
inode-map.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
inode.c
btrfs: qgroup: Use separate meta reservation type for delalloc
2018-03-31 01:41:14 +02:00
ioctl.c
btrfs: qgroup: Use separate meta reservation type for delalloc
2018-03-31 01:41:14 +02:00
Kconfig
btrfs: Remove custom crc32c init code
2018-03-26 15:09:39 +02:00
locking.c
btrfs: Relax memory barrier in btrfs_tree_unlock
2018-03-31 01:26:51 +02:00
locking.h
…
lzo.c
btrfs: Remove unused tot_len var from lzo_decompress
2018-03-31 01:26:57 +02:00
Makefile
btrfs: Remove custom crc32c init code
2018-03-26 15:09:39 +02:00
math.h
…
ordered-data.c
btrfs: qgroup: Use separate meta reservation type for delalloc
2018-03-31 01:41:14 +02:00
ordered-data.h
btrfs: add more __cold annotations
2018-03-26 15:09:39 +02:00
orphan.c
…
print-tree.c
btrfs: Validate child tree block's level and first key
2018-03-31 02:01:06 +02:00
print-tree.h
btrfs: get fs_info from eb in btrfs_print_tree, remove argument
2017-08-16 16:12:03 +02:00
props.c
btrfs: drop underscores from exported xattr functions
2018-03-26 15:09:41 +02:00
props.h
…
qgroup.c
btrfs: use lockdep_assert_held for spinlocks
2018-03-31 02:01:06 +02:00
qgroup.h
btrfs: qgroup: Introduce function to convert META_PREALLOC into META_PERTRANS
2018-03-31 01:41:14 +02:00
raid56.c
Btrfs: replace: cache rbio when rebuild data on missing device
2018-03-31 01:41:12 +02:00
raid56.h
btrfs: take an fs_info directly when the root is not used otherwise
2016-12-06 16:06:59 +01:00
rcu-string.h
…
reada.c
btrfs: remove unused member err from reada_extent
2017-06-19 18:25:59 +02:00
ref-verify.c
btrfs: Validate child tree block's level and first key
2018-03-31 02:01:06 +02:00
ref-verify.h
Btrfs: add a extent ref verify tool
2017-10-30 12:28:00 +01:00
relocation.c
btrfs: Validate child tree block's level and first key
2018-03-31 02:01:06 +02:00
root-tree.c
btrfs: Cleanup existing name_len checks
2018-01-22 16:08:12 +01:00
scrub.c
btrfs: use lockdep_assert_held for mutexes
2018-03-31 02:01:06 +02:00
send.c
Btrfs: send: fix typo in TLV_PUT
2018-03-26 15:09:42 +02:00
send.h
btrfs: fix send ioctl on 32bit with 64bit kernel
2017-10-30 12:27:59 +01:00
struct-funcs.c
btrfs: struct-funcs, constify readers
2017-08-16 14:19:53 +02:00
super.c
btrfs: use RCU in btrfs_show_devname for device list traversal
2018-03-31 02:01:06 +02:00
sysfs.c
btrfs: defer adding raid type kobject until after chunk relocation
2018-03-31 01:41:12 +02:00
sysfs.h
Merge branch 'for-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
2017-11-14 13:35:29 -08:00
transaction.c
btrfs: qgroup: Split meta rsv type into meta_prealloc and meta_pertrans
2018-03-31 01:41:14 +02:00
transaction.h
btrfs: Remove code referencing unused TRANS_USERSPACE
2018-03-31 01:26:51 +02:00
tree-checker.c
btrfs: add more __cold annotations
2018-03-26 15:09:39 +02:00
tree-checker.h
btrfs: tree-checker: Replace root parameter with fs_info
2018-03-26 15:09:38 +02:00
tree-defrag.c
btrfs: add define for oldest generation
2018-03-31 01:26:50 +02:00
tree-log.c
btrfs: Validate child tree block's level and first key
2018-03-31 02:01:06 +02:00
tree-log.h
btrfs: Remove root argument from btrfs_log_dentry_safe
2018-03-26 15:09:42 +02:00
ulist.c
btrfs: ulist: rename ulist_fini to ulist_release
2017-02-17 12:03:50 +01:00
ulist.h
btrfs: ulist: rename ulist_fini to ulist_release
2017-02-17 12:03:50 +01:00
uuid-tree.c
btrfs: add define for oldest generation
2018-03-31 01:26:50 +02:00
volumes.c
btrfs: use lockdep_assert_held for mutexes
2018-03-31 02:01:06 +02:00
volumes.h
btrfs: rename btrfs_close_extra_device to btrfs_free_extra_devids
2018-03-26 15:09:42 +02:00
xattr.c
btrfs: adjust return type of btrfs_getxattr
2018-03-26 15:09:41 +02:00
xattr.h
btrfs: move btrfs_listxattr prototype to xattr.h
2018-03-26 15:09:41 +02:00
zlib.c
btrfs: allow to set compression level for zlib
2017-11-01 20:45:29 +01:00
zstd.c
btrfs: move some zstd work data from stack to workspace
2018-01-22 16:08:14 +01:00