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xfs: Fix comment on xfs_trans_ail_update_bulk()

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This function doesn't take the AIL lock, but should be called
with AIL lock held. Also (hopefuly) simplify the comment.

Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chandan Babu R <chandanbabu@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
This commit is contained in:
Carlos Maiolino 2025-05-12 13:42:56 +02:00
parent fa8deae92f
commit 08c73a4b2e
1 changed files with 17 additions and 15 deletions
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32
fs/xfs/xfs_trans_ail.c
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@ -777,26 +777,28 @@ xfs_ail_update_finish(
}
/*
* xfs_trans_ail_update - bulk AIL insertion operation.
* xfs_trans_ail_update_bulk - bulk AIL insertion operation.
*
* @xfs_trans_ail_update takes an array of log items that all need to be
* @xfs_trans_ail_update_bulk takes an array of log items that all need to be
* positioned at the same LSN in the AIL. If an item is not in the AIL, it will
* be added. Otherwise, it will be repositioned by removing it and re-adding
* it to the AIL. If we move the first item in the AIL, update the log tail to
* match the new minimum LSN in the AIL.
* be added. Otherwise, it will be repositioned by removing it and re-adding
* it to the AIL.
*
* This function takes the AIL lock once to execute the update operations on
* all the items in the array, and as such should not be called with the AIL
* lock held. As a result, once we have the AIL lock, we need to check each log
* item LSN to confirm it needs to be moved forward in the AIL.
* If we move the first item in the AIL, update the log tail to match the new
* minimum LSN in the AIL.
*
* To optimise the insert operation, we delete all the items from the AIL in
* the first pass, moving them into a temporary list, then splice the temporary
* list into the correct position in the AIL. This avoids needing to do an
* insert operation on every item.
* This function should be called with the AIL lock held.
*
* This function must be called with the AIL lock held. The lock is dropped
* before returning.
* To optimise the insert operation, we add all items to a temporary list, then
* splice this list into the correct position in the AIL.
*
* Items that are already in the AIL are first deleted from their current
* location before being added to the temporary list.
*
* This avoids needing to do an insert operation on every item.
*
* The AIL lock is dropped by xfs_ail_update_finish() before returning to
* the caller.
*/
void
xfs_trans_ail_update_bulk(