minix/servers/vfs/glo.h
Ben Gras cef94e096e vfs: make m_out non-global
m_out is shared between threads as the reply message, and it can happen
results get overwritten by another thread before the reply is sent. This
change

	. makes m_out local to the message handling function,
	  declared on the stack of the caller
	. forces callers of reply() to give it a message, or
	  declare the reply message has no significant fields except
	  for the return code by calling replycode()

Change-Id: Id06300083a63c72c00f34f86a5c7d96e4bbdf9f6
2013-04-12 23:40:38 +00:00

58 lines
2.1 KiB
C

#ifndef __VFS_GLO_H__
#define __VFS_GLO_H__
/* EXTERN should be extern except for the table file */
#ifdef _TABLE
#undef EXTERN
#define EXTERN
#endif
#include <minix/param.h>
/* File System global variables */
EXTERN struct fproc *fp; /* pointer to caller's fproc struct */
EXTERN int susp_count; /* number of procs suspended on pipe */
EXTERN int nr_locks; /* number of locks currently in place */
EXTERN int reviving; /* number of pipe processes to be revived */
EXTERN int pending;
EXTERN int sending;
EXTERN int verbose;
EXTERN dev_t ROOT_DEV; /* device number of the root device */
EXTERN int ROOT_FS_E; /* kernel endpoint of the root FS proc */
EXTERN u32_t system_hz; /* system clock frequency. */
/* The parameters of the call are kept here. */
EXTERN message m_in; /* the input message itself */
# define who_p ((int) (fp - fproc))
# define isokslot(p) (p >= 0 && \
p < (int)(sizeof(fproc) / sizeof(struct fproc)))
# define who_e (self != NULL && fp != NULL ? fp->fp_endpoint : \
m_in.m_source)
# define call_nr (m_in.m_type)
# define job_m_in (self->w_job.j_m_in)
# define job_call_nr (job_m_in.m_type)
# define super_user (fp->fp_effuid == SU_UID ? 1 : 0)
# define scratch(p) (scratchpad[((int) ((p) - fproc))])
EXTERN struct worker_thread *self;
EXTERN int force_sync; /* toggle forced synchronous communication */
EXTERN int deadlock_resolving;
EXTERN mutex_t exec_lock;
EXTERN mutex_t bsf_lock;/* Global lock for access to block special files */
EXTERN struct worker_thread workers[NR_WTHREADS];
EXTERN struct worker_thread sys_worker;
EXTERN struct worker_thread dl_worker;
EXTERN thread_t invalid_thread_id;
EXTERN char mount_label[LABEL_MAX]; /* label of file system to mount */
/* The following variables are used for returning results to the caller. */
EXTERN int err_code; /* temporary storage for error number */
/* Data initialized elsewhere. */
extern int(*call_vec[]) (message *);
extern int(*pfs_call_vec[]) (message *m_out);
extern char mode_map[]; /* mapping from O_ACCMODE mask to R_BIT/W_BIT flags */
EXTERN struct kinfo kinfo; /* kernel information */
#endif