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cpukit/jffs2: Implement JFFS2 spinlocks

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This provides a non-noop implementation of spinlocks for JFFS2 in terms
of RTEMS mutexes. POSIX spinlocks are not appropriate for the types of
actions that occur during a held JFFS2 spinlock and can cause bad
dispatch level conditions.
This commit is contained in:
Kinsey Moore
2023-10-04 12:26:57 -05:00
committed by Joel Sherrill
parent c5476e2b8c
commit d7aa1ab86f
2 changed files with 8 additions and 24 deletions
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30
cpukit/libfs/src/jffs2/include/linux/spinlock.h
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@@ -1,34 +1,16 @@
#ifndef __LINUX_SPINLOCK_H__
#define __LINUX_SPINLOCK_H__
#include <rtems/thread.h>
typedef struct { } spinlock_t;
#define SPIN_LOCK_UNLOCKED (spinlock_t) { }
#define DEFINE_SPINLOCK(x) spinlock_t x = SPIN_LOCK_UNLOCKED
typedef struct { rtems_mutex r_m; } spinlock_t;
#define spin_lock_init(lock) \
CYG_MACRO_START; \
CYG_UNUSED_PARAM(spinlock_t *, lock); \
CYG_MACRO_END
#define DEFINE_SPINLOCK(x) spinlock_t x
#define spin_lock(lock) \
CYG_MACRO_START; \
CYG_UNUSED_PARAM(spinlock_t *, lock); \
CYG_MACRO_END
#define spin_lock_init(x) rtems_mutex_init(&(x)->r_m, "JFFS2 Spinlock");
#define spin_unlock(lock) \
CYG_MACRO_START; \
CYG_UNUSED_PARAM(spinlock_t *, lock); \
CYG_MACRO_END
#define spin_lock(x) rtems_mutex_lock(&(x)->r_m);
#define spin_lock_bh(lock) \
CYG_MACRO_START; \
CYG_UNUSED_PARAM(spinlock_t *, lock); \
CYG_MACRO_END
#define spin_unlock_bh(lock) \
CYG_MACRO_START; \
CYG_UNUSED_PARAM(spinlock_t *, lock); \
CYG_MACRO_END
#define spin_unlock(x) rtems_mutex_unlock(&(x)->r_m);
#endif /* __LINUX_SPINLOCK_H__ */

2
cpukit/libfs/src/jffs2/src/fs-rtems.c
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@@ -1384,6 +1384,8 @@ int rtems_jffs2_initialize(
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
add_delayed_work_to_chain(&c->wbuf_dwork);
#endif
spin_lock_init(&c->erase_completion_lock);
spin_lock_init(&c->inocache_lock);
c->mtd = NULL;
rtems_recursive_mutex_init(&sb->s_mutex, RTEMS_FILESYSTEM_TYPE_JFFS2);
}