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Add mutex_enter_interruptible() for interruptible sleeping IOCTLs

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Many long-running ZFS ioctls lock the spa_namespace_lock, forcing
concurrent ioctls to sleep for the mutex. Previously, the only
option is to call mutex_enter() which sleeps uninterruptibly. This
is a usability issue for sysadmins, for example, if the admin runs
`zpool status` while a slow `zpool import` is ongoing, the admin's
shell will be locked in uninterruptible sleep for a long time.

This patch resolves this admin usability issue by introducing
mutex_enter_interruptible() which sleeps interruptibly while waiting
to acquire a lock. It is implemented for both Linux and FreeBSD.

The ZFS_IOC_POOL_CONFIGS ioctl, used by `zpool status`, is changed to
use this new macro so that the command can be interrupted if it is
issued during a concurrent `zpool import` (or other long-running
operation).

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Thomas Bertschinger <bertschinger@lanl.gov>
Closes #15360
This commit is contained in:
Thomas Bertschinger
2023-10-26 10:17:40 -06:00
committed by Tony Hutter
parent 8ba748d414
commit f9a9aea126
7 changed files with 38 additions and 19 deletions
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include/sys/spa.h
+1 -1
View File
@@ -837,7 +837,7 @@ extern kmutex_t spa_namespace_lock;
extern void spa_write_cachefile(spa_t *, boolean_t, boolean_t, boolean_t);
extern void spa_config_load(void);
extern nvlist_t *spa_all_configs(uint64_t *);
extern int spa_all_configs(uint64_t *generation, nvlist_t **pools);
extern void spa_config_set(spa_t *spa, nvlist_t *config);
extern nvlist_t *spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg,
int getstats);
include/sys/zfs_context.h
+2
View File
@@ -274,11 +274,13 @@ typedef struct kmutex {
extern void mutex_init(kmutex_t *mp, char *name, int type, void *cookie);
extern void mutex_destroy(kmutex_t *mp);
extern void mutex_enter(kmutex_t *mp);
extern int mutex_enter_check_return(kmutex_t *mp);
extern void mutex_exit(kmutex_t *mp);
extern int mutex_tryenter(kmutex_t *mp);
#define NESTED_SINGLE 1
#define mutex_enter_nested(mp, class) mutex_enter(mp)
#define mutex_enter_interruptible(mp) mutex_enter_check_return(mp)
/*
* RW locks
*/