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lightnvm: pblk: refactor metadata paths

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pblk maintains two different metadata paths for smeta and emeta, which
store metadata at the start of the line and at the end of the line,
respectively. Until now, these path has been common for writing and
retrieving metadata, however, as these paths diverge, the common code
becomes less clear and unnecessary complicated.

In preparation for further changes to the metadata write path, this
patch separates the write and read paths for smeta and emeta and
removes the synchronous emeta path as it not used anymore (emeta is
scheduled asynchronously to prevent jittering due to internal I/Os).

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Javier González
2018-10-09 13:12:03 +02:00
committed by Jens Axboe
parent 45dcf29b98
commit af3fac1664
4 changed files with 155 additions and 180 deletions
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2
drivers/lightnvm/pblk-gc.c
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@@ -148,7 +148,7 @@ static __le64 *get_lba_list_from_emeta(struct pblk *pblk,
if (!emeta_buf)
return NULL;
ret = pblk_line_read_emeta(pblk, line, emeta_buf);
ret = pblk_line_emeta_read(pblk, line, emeta_buf);
if (ret) {
pblk_err(pblk, "line %d read emeta failed (%d)\n",
line->id, ret);