kernel/linux.git/fs/dlm/dir.c, branch v6.19.11

dlm: use rwlock for rsb hash table

2024-04-16T19:45:31+00:00

The conversion to rhashtable introduced a hash table lock per lockspace, in place of per bucket locks. To make this more scalable, switch to using a rwlock for hash table access. The common case fast path uses it as a read lock. Signed-off-by: Alexander Aring Signed-off-by: David Teigland

dlm: switch to use rhashtable for rsbs

2024-04-16T19:34:39+00:00

Replace our own hash table with the more advanced rhashtable for keeping rsb structs. Signed-off-by: Alexander Aring Signed-off-by: David Teigland

dlm: merge toss and keep hash table lists into one list

2024-04-16T18:49:13+00:00

There are several places where lock processing can perform two hash table lookups, first in the "keep" list, and if not found, in the "toss" list. This patch introduces a new rsb state flag "RSB_TOSS" to represent the difference between the state of being on keep vs toss list, so that the two lists can be combined. This avoids cases of two lookups. Signed-off-by: Alexander Aring Signed-off-by: David Teigland

dlm: change to single hashtable lock

2024-04-16T18:46:41+00:00

Prepare to replace our own hash table with rhashtable by replacing the per-bucket locks in our own hash table with a single lock. Signed-off-by: Alexander Aring Signed-off-by: David Teigland

dlm: use spin_lock_bh for message processing

2024-04-09T16:45:23+00:00

Use spin_lock_bh for all spinlocks involved in message processing, in preparation for softirq message processing. DLM lock requests from user space involve dlm processing in user context, in addition to the standard kernel context, necessitating bh variants. Signed-off-by: Alexander Aring Signed-off-by: David Teigland

dlm: add new struct to save position in dlm_copy_master_names

2024-04-09T16:44:49+00:00

Add a new struct to save the current position in the rsb masters_list while sending the rsb names to other nodes. The rsb names are sent in multiple chunks, and for each new chunk, the new "dlm_dir_dump" struct saves the last position in the masters_list. The new struct is also used to save more information to sanity check the recovery process. Signed-off-by: Alexander Aring Signed-off-by: David Teigland

dlm: move rsb root_list to ls_recover() stack

2024-04-09T16:44:49+00:00

Move the rsb root_list from the lockspace to a stack variable since it is now only used by the ls_recover() function. Signed-off-by: Alexander Aring Signed-off-by: David Teigland

dlm: use a new list for recovery of master rsb names

2024-04-09T16:44:49+00:00

Add a new "masters_list" for master rsb structs, with a new rwlock. The new list is created and used during the recovery process to send the master rsb names to new nodes. With this change, the current "root_list" can be used without locking. Signed-off-by: Alexander Aring Signed-off-by: David Teigland

fs: dlm: constify receive buffer

2023-08-10T15:33:03+00:00

The dlm receive buffer should be never manipulated as DLM is the last instance of parsing layer. This patch constify the whole receive buffer so we are sure it never gets manipulated when it's being parsed. Signed-off-by: Alexander Aring Signed-off-by: David Teigland

fs: dlm: drop rxbuf manipulation in dlm_copy_master_names

2023-08-10T15:33:03+00:00

This patch removes the manipulation of the receive buffer in case of an error and be sure the buffer is null terminated before an error messagea is printed out. Instead of manipulate the receive buffer we tell inside the format string the maximum length the string buffer is being read. Signed-off-by: Alexander Aring Signed-off-by: David Teigland