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ext4: updated locking documentation for journal_t

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Some members of transaction_t are allowed to be read without any lock
being held if consistency doesn't matter.  Based on LockDoc's
findings, we extended the locking documentation of those members.
Each one of them is marked with a short comment: "no lock for quick
racy checks".

Signed-off-by: Alexander Lochmann <alexander.lochmann@tu-dortmund.de>
Signed-off-by: Horst Schirmeier <horst.schirmeier@tu-dortmund.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/ad82c7a9-a624-4ed5-5ada-a6410c44c0b3@tu-dortmund.de
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Alexander Lochmann
2021-02-11 10:51:55 +01:00
committed by Theodore Ts'o
parent bd256fda92
commit d699ae4fc2
1 changed files with 8 additions and 5 deletions
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13
include/linux/jbd2.h
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@@ -768,7 +768,8 @@ enum passtype {PASS_SCAN, PASS_REVOKE, PASS_REPLAY};
struct journal_s
{
/**
* @j_flags: General journaling state flags [j_state_lock]
* @j_flags: General journaling state flags [j_state_lock,
* no lock for quick racy checks]
*/
unsigned long j_flags;
@@ -808,7 +809,8 @@ struct journal_s
/**
* @j_barrier_count:
*
* Number of processes waiting to create a barrier lock [j_state_lock]
* Number of processes waiting to create a barrier lock [j_state_lock,
* no lock for quick racy checks]
*/
int j_barrier_count;
@@ -821,7 +823,8 @@ struct journal_s
* @j_running_transaction:
*
* Transactions: The current running transaction...
* [j_state_lock] [caller holding open handle]
* [j_state_lock, no lock for quick racy checks] [caller holding
* open handle]
*/
transaction_t *j_running_transaction;
@@ -1033,7 +1036,7 @@ struct journal_s
* @j_commit_sequence:
*
* Sequence number of the most recently committed transaction
* [j_state_lock].
* [j_state_lock, no lock for quick racy checks]
*/
tid_t j_commit_sequence;
@@ -1041,7 +1044,7 @@ struct journal_s
* @j_commit_request:
*
* Sequence number of the most recent transaction wanting commit
* [j_state_lock]
* [j_state_lock, no lock for quick racy checks]
*/
tid_t j_commit_request;