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zio: rename io_reexecute as io_post; use it for the direct IO checksum error flag

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We're not supposed to modify someone else's io_flags, so we need another
way to propagate DIO_CHKSUM_ERR.

If we squint, we can see that io_reexecute is really just recording
exceptional events that a parent (or its parents) will need to do
something about. It just happens that the only things we've had
historically are two forms of reexecution: now or later (suspend).

So, rename it to io_post, as in, post-IO info/events/actions. And now we
have a few spare bits for other conditions.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes #17507
This commit is contained in:
Rob Norris
2025-07-05 13:16:14 +10:00
committed by GitHub
parent ee0cb4cb89
commit 92d3b4ee2c
8 changed files with 50 additions and 52 deletions
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include/sys/zio.h
+11 -10
View File
@@ -226,8 +226,7 @@ typedef uint64_t zio_flag_t;
#define ZIO_FLAG_NOPWRITE (1ULL << 29)
#define ZIO_FLAG_REEXECUTED (1ULL << 30)
#define ZIO_FLAG_DELEGATED (1ULL << 31)
#define ZIO_FLAG_DIO_CHKSUM_ERR (1ULL << 32)
#define ZIO_FLAG_PREALLOCATED (1ULL << 33)
#define ZIO_FLAG_PREALLOCATED (1ULL << 32)
#define ZIO_ALLOCATOR_NONE (-1)
#define ZIO_HAS_ALLOCATOR(zio) ((zio)->io_allocator != ZIO_ALLOCATOR_NONE)
@@ -418,14 +417,16 @@ typedef struct zio_transform {
typedef zio_t *zio_pipe_stage_t(zio_t *zio);
/*
* The io_reexecute flags are distinct from io_flags because the child must
* be able to propagate them to the parent. The normal io_flags are local
* to the zio, not protected by any lock, and not modifiable by children;
* the reexecute flags are protected by io_lock, modifiable by children,
* and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
* The io_post flags describe additional actions that a parent IO should
* consider or perform on behalf of a child. They are distinct from io_flags
* because the child must be able to propagate them to the parent. The normal
* io_flags are local to the zio, not protected by any lock, and not modifiable
* by children; the reexecute flags are protected by io_lock, modifiable by
* children, and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
*/
#define ZIO_REEXECUTE_NOW 0x01
#define ZIO_REEXECUTE_SUSPEND 0x02
#define ZIO_POST_REEXECUTE (1 << 0)
#define ZIO_POST_SUSPEND (1 << 1)
#define ZIO_POST_DIO_CHKSUM_ERR (1 << 2)
/*
* The io_trim flags are used to specify the type of TRIM to perform. They
@@ -461,7 +462,7 @@ struct zio {
enum zio_child io_child_type;
enum trim_flag io_trim_flags;
zio_priority_t io_priority;
uint8_t io_reexecute;
uint8_t io_post;
uint8_t io_state[ZIO_WAIT_TYPES];
uint64_t io_txg;
spa_t *io_spa;