e8eeebcd47
. 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
93 lines
3.3 KiB
C
93 lines
3.3 KiB
C
/* Prototypes and definitions for VM interface. */
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#ifndef _MINIX_VM_H
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#define _MINIX_VM_H
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#include <sys/types.h>
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#include <minix/endpoint.h>
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int vm_exit(endpoint_t ep);
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int vm_fork(endpoint_t ep, int slotno, endpoint_t *child_ep);
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int vm_brk(endpoint_t ep, char *newaddr);
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int vm_willexit(endpoint_t ep);
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int vm_adddma(endpoint_t proc_e, phys_bytes start, phys_bytes size);
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int vm_deldma(endpoint_t proc_e, phys_bytes start, phys_bytes size);
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int vm_getdma(endpoint_t *procp, phys_bytes *basep, phys_bytes *sizep);
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void *vm_map_phys(endpoint_t who, void *physaddr, size_t len);
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int vm_unmap_phys(endpoint_t who, void *vaddr, size_t len);
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int vm_notify_sig(endpoint_t ep, endpoint_t ipc_ep);
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int vm_set_priv(int procnr, void *buf);
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int vm_update(endpoint_t src_e, endpoint_t dst_e);
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int vm_memctl(endpoint_t ep, int req);
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int vm_query_exit(endpoint_t *endpt);
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int vm_watch_exit(endpoint_t ep);
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int vm_forgetblock(u64_t id);
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void vm_forgetblocks(void);
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int vm_yield_block_get_block(u64_t yieldid, u64_t getid, void *mem,
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vir_bytes len);
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int minix_vfs_mmap(endpoint_t who, u32_t offset, u32_t len,
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u32_t dev, u32_t ino, u16_t fd, u32_t vaddr, u16_t clearend, u16_t
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flags);
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/* minix vfs mmap flags */
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#define MVM_LENMASK 0x0FFF
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#define MVM_FLAGSMASK 0xF000
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#define MVM_WRITABLE 0x8000
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/* Invalid ID with special meaning for the vm_yield_block_get_block
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* interface.
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*/
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#define VM_BLOCKID_NONE make64(ULONG_MAX, ULONG_MAX)
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/* VM kernel request types. */
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#define VMPTYPE_NONE 0
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#define VMPTYPE_CHECK 1
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struct vm_stats_info {
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unsigned int vsi_pagesize; /* page size */
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unsigned long vsi_total; /* total number of memory pages */
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unsigned long vsi_free; /* number of free pages */
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unsigned long vsi_largest; /* largest number of consecutive free pages */
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unsigned long vsi_cached; /* number of pages cached for file systems */
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};
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struct vm_usage_info {
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vir_bytes vui_total; /* total amount of process memory */
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vir_bytes vui_common; /* part of memory mapped in more than once */
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vir_bytes vui_shared; /* shared (non-COW) part of common memory */
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};
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struct vm_region_info {
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vir_bytes vri_addr; /* base address of region */
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vir_bytes vri_length; /* length of region */
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int vri_prot; /* protection flags (PROT_) */
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int vri_flags; /* memory flags (subset of MAP_) */
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};
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#define MAX_VRI_COUNT 64 /* max. number of regions provided at once */
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int vm_info_stats(struct vm_stats_info *vfi);
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int vm_info_usage(endpoint_t who, struct vm_usage_info *vui);
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int vm_info_region(endpoint_t who, struct vm_region_info *vri, int
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count, vir_bytes *next);
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int vm_procctl(endpoint_t ep, int param);
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int vm_set_cacheblock(void *block, u32_t dev, u64_t dev_offset,
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u64_t ino, u64_t ino_offset, u32_t *flags, int blocksize);
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void *vm_map_cacheblock(u32_t dev, u64_t dev_offset,
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u64_t ino, u64_t ino_offset, u32_t *flags, int blocksize);
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/* flags for vm cache functions */
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#define VMMC_FLAGS_LOCKED 0x01 /* someone is updating the flags; don't read/write */
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#define VMMC_DIRTY 0x02 /* dirty buffer and it may not be evicted */
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#define VMMC_EVICTED 0x04 /* VM has evicted the buffer and it's invalid */
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#define VMMC_BLOCK_LOCKED 0x08 /* client is using it and it may not be evicted */
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/* special inode number for vm cache functions */
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#define VMC_NO_INODE 0 /* to reference a disk block, no associated file */
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#endif /* _MINIX_VM_H */
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