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btrfs: Add comments on locking of several device-related fields

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Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2019-05-09 18:11:11 +03:00 committed by David Sterba
parent bd80d94efb
commit 0b6f5d408b
2 changed files with 11 additions and 4 deletions
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4
fs/btrfs/volumes.c
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@ -239,7 +239,9 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
* chunk_mutex
* -----------
* protects chunks, adding or removing during allocation, trim or when a new
* device is added/removed
* device is added/removed. Additionally it also protects post_commit_list of
* individual devices, since they can be added to the transaction's
* post_commit_list only with chunk_mutex held.
*
* cleaner_mutex
* -------------

11
fs/btrfs/volumes.h
View File

@ -43,8 +43,8 @@ struct btrfs_pending_bios {
#define BTRFS_DEV_STATE_FLUSH_SENT (4)
struct btrfs_device {
struct list_head dev_list;
struct list_head dev_alloc_list;
struct list_head dev_list; /* device_list_mutex */
struct list_head dev_alloc_list; /* chunk mutex */
struct list_head post_commit_list; /* chunk mutex */
struct btrfs_fs_devices *fs_devices;
struct btrfs_fs_info *fs_info;
@ -229,9 +229,14 @@ struct btrfs_fs_devices {
* this mutex lock.
*/
struct mutex device_list_mutex;
/* List of all devices, protected by device_list_mutex */
struct list_head devices;
/* devices not currently being allocated */
/*
* Devices which can satisfy space allocation. Protected by
* chunk_mutex
*/
struct list_head alloc_list;
struct btrfs_fs_devices *seed;