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vfs: mmap support

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. 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.
	. 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.

Change-Id: I831551e45a6781c74313c450eb9c967a68505932
This commit is contained in:
Ben Gras
2013-05-07 12:41:07 +00:00
parent 924eb29565
commit 33a7ac7557
19 changed files with 395 additions and 80 deletions
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4
include/minix/callnr.h
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@@ -1,4 +1,4 @@
#define NCALLS 117 /* number of system calls allowed */
#define NCALLS 118 /* number of system calls allowed */
/* In case it isn't obvious enough: this list is sorted numerically. */
#define EXIT 1
@@ -107,6 +107,8 @@
#define CLOCK_GETTIME 115 /* clock_gettime() */
#define CLOCK_SETTIME 116 /* clock_settime() */
#define VFS_VMCALL 117
#define TASK_REPLY 121 /* to VFS: reply code from drivers, not
* really a standalone call.
*/

9
include/minix/com.h
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@@ -1005,6 +1005,7 @@
# define VMV_DEV m10_i4
# define VMV_INO m10_l1
# define VMV_FD m10_l2
# define VMV_SIZE_PAGES m10_l3
#define VM_REMAP (VM_RQ_BASE+33)
# define VMRE_D m1_i1
@@ -1075,8 +1076,10 @@
#define VMPPARAM_CLEAR 1 /* values for VMPCTL_PARAM */
#define VM_VFS_MMAP (VM_RQ_BASE+46)
/* Total. */
#define NR_VM_CALLS 46
#define NR_VM_CALLS 47
#define VM_CALL_MASK_SIZE BITMAP_CHUNKS(NR_VM_CALLS)
/* not handled as a normal VM call, thus at the end of the reserved rage */
@@ -1086,8 +1089,8 @@
/* Basic vm calls allowed to every process. */
#define VM_BASIC_CALLS \
VM_MMAP, VM_MUNMAP, VM_MAP_PHYS, VM_UNMAP_PHYS, \
VM_INFO, VM_MAPCACHEPAGE
VM_MMAP, VM_VFS_REPLY, VM_MUNMAP, VM_MAP_PHYS, VM_UNMAP_PHYS, \
VM_INFO
/*===========================================================================*
* Messages for IPC server *

8
include/minix/vm.h
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@@ -26,6 +26,14 @@ int vm_forgetblock(u64_t id);
void vm_forgetblocks(void);
int vm_yield_block_get_block(u64_t yieldid, u64_t getid, void *mem,
vir_bytes len);
int minix_vfs_mmap(endpoint_t who, u32_t offset, u32_t len,
u32_t dev, u32_t ino, u16_t fd, u32_t vaddr, u16_t clearend, u16_t
flags);
/* minix vfs mmap flags */
#define MVM_LENMASK 0x0FFF
#define MVM_FLAGSMASK 0xF000
#define MVM_WRITABLE 0x8000
/* Invalid ID with special meaning for the vm_yield_block_get_block
* interface.