657bc824c3
. libc: add vfs_mmap, a way for vfs to initiate mmap()s. This is a good special case to have as vfs is a slightly different client from regular user processes. It doesn't do it for itself, and has the dev & inode info already so the callback to VFS for the lookup isn't necessary. So it has different info to have to give to VM. . libc: also add minix_mmap64() that accepts a 64-bit offset, even though our off_t is still 32 bit now. . to support mmap, we need to create new references to FD's (such as an FD) so that the mmapped object can never be removed even if all FD's are closed. To do that we conceptually dup the filedescriptor into a new range that is only visible to the system. So there are FDS_PER_PROCESS fd's, which is more than OPEN_MAX, per process, and user processes can still use up to OPEN_MAX FD's. mmap()ped objects then get extra reference in the invisible range so user processes can't close them. The in-vfs fd_set is of size FDS_PER_PROCESS. . On exec() time, try to mmap() in the executable if available. (It is not yet available in this commit.) . To support mmap(), add do_vm_call that allows VM to lookup (to ino+dev), do i/o from and close FD's on behalf of other processes. . To make this possible, a few functions have 2 more arguments to make the target process explicit (instead of the implicit global fp) and to specify whether the request is from a user process or the system (which implies whether FD's starting at OPEN_MAX are valid). These are close_fd, common_open, actual_llseek, actual_read_write_peek, get_fd and get_filp2. Change-Id: I831551e45a6781c74313c450eb9c967a68505932
75 lines
2.8 KiB
C
75 lines
2.8 KiB
C
#ifndef __VFS_FPROC_H__
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#define __VFS_FPROC_H__
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#include "threads.h"
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#include "fdset.h"
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#include <sys/select.h>
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#include <minix/safecopies.h>
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/* This is the per-process information. A slot is reserved for each potential
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* process. Thus NR_PROCS must be the same as in the kernel. It is not
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* possible or even necessary to tell when a slot is free here.
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*/
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#define LOCK_DEBUG 0
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EXTERN struct fproc {
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unsigned fp_flags;
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pid_t fp_pid; /* process id */
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endpoint_t fp_endpoint; /* kernel endpoint number of this process */
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struct vnode *fp_wd; /* working directory; NULL during reboot */
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struct vnode *fp_rd; /* root directory; NULL during reboot */
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struct filp *fp_filp[FDS_PER_PROCESS]; /* the file descriptor table */
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fd_set fp_filp_inuse; /* which fd's are in use? */
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fd_set fp_cloexec_set; /* bit map for POSIX Table 6-2 FD_CLOEXEC */
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dev_t fp_tty; /* major/minor of controlling tty */
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int fp_blocked_on; /* what is it blocked on */
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int fp_block_callnr; /* blocked call if rd/wr can't finish */
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int fp_cum_io_partial; /* partial byte count if rd/wr can't finish */
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endpoint_t fp_task; /* which task is proc suspended on */
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endpoint_t fp_ioproc; /* proc no. in suspended-on i/o message */
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cp_grant_id_t fp_grant; /* revoke this grant on unsuspend if > -1 */
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uid_t fp_realuid; /* real user id */
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uid_t fp_effuid; /* effective user id */
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gid_t fp_realgid; /* real group id */
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gid_t fp_effgid; /* effective group id */
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int fp_ngroups; /* number of supplemental groups */
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gid_t fp_sgroups[NGROUPS_MAX];/* supplemental groups */
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mode_t fp_umask; /* mask set by umask system call */
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mutex_t fp_lock; /* mutex to lock fproc object */
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struct job fp_job; /* pending job */
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thread_t fp_wtid; /* Thread ID of worker */
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char fp_name[PROC_NAME_LEN]; /* Last exec() */
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#if LOCK_DEBUG
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int fp_vp_rdlocks; /* number of read-only locks on vnodes */
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int fp_vmnt_rdlocks; /* number of read-only locks on vmnts */
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#endif
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} fproc[NR_PROCS];
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/* fp_flags */
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#define FP_NOFLAGS 00
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#define FP_SUSP_REOPEN 01 /* Process is suspended until the reopens are
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* completed (after the restart of a driver).
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*/
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#define FP_REVIVED 0002 /* Indicates process is being revived */
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#define FP_SESLDR 0004 /* Set if process is session leader */
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#define FP_PENDING 0010 /* Set if process has pending work */
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#define FP_EXITING 0020 /* Set if process is exiting */
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#define FP_PM_PENDING 0040 /* Set if process has pending PM request */
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#define FP_SRV_PROC 0100 /* Set if process is a service */
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#define FP_DROP_WORK 0200 /* Set if process won't accept new work */
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/* Field values. */
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#define NOT_REVIVING 0xC0FFEEE /* process is not being revived */
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#define REVIVING 0xDEEAD /* process is being revived from suspension */
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#define PID_FREE 0 /* process slot free */
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#endif /* __VFS_FPROC_H__ */
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