565f13088f
Change the kernel to add features to vircopy and safecopies so that
transparent copy fixing won't happen to avoid deadlocks, and such copies
fail with EFAULT.
Transparently making copying work from filesystems (as normally done by
the kernel & VM when copying fails because of missing/readonly memory)
is problematic as it can happen that, for file-mapped ranges, that that
same filesystem that is blocked on the copy request is needed to satisfy
the memory range, leading to deadlock. Dito for VFS itself, if done with
a blocking call.
This change makes the copying done from a filesystem fail in such cases
with EFAULT by VFS adding the CPF_TRY flag to the grants. If a FS call
fails with EFAULT, VFS will then request the range to be made available
to VM after the FS is unblocked, allowing it to be used to satisfy the
range if need be in another VFS thread.
Similarly, for datacopies that VFS itself does, it uses the failable
vircopy variant and callers use a wrapper that talk to VM if necessary
to get the copy to work.
. kernel: add CPF_TRY flag to safecopies
. kernel: only request writable ranges to VM for the
target buffer when copying fails
. do copying in VFS TRY-first
. some fixes in VM to build SANITYCHECK mode
. add regression test for the cases where
- a FS system call needs memory mapped in a process that the
FS itself must map.
- such a range covers more than one file-mapped region.
. add 'try' mode to vircopy, physcopy
. add flags field to copy kernel call messages
. if CP_FLAG_TRY is set, do not transparently try
to fix memory ranges
. for use by VFS when accessing user buffers to avoid
deadlock
. remove some obsolete backwards compatability assignments
. VFS: let thread scheduling work for VM requests too
Allows VFS to make calls to VM while suspending and resuming
the currently running thread. Does currently not work for the
main thread.
. VM: add fix memory range call for use by VFS
Change-Id: I295794269cea51a3163519a9cfe5901301d90b32
165 lines
6.5 KiB
C
165 lines
6.5 KiB
C
#ifndef _MINIX_CONST_H
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#define _MINIX_CONST_H
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#include <machine/archconst.h>
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/* The UNUSED annotation tells the compiler or lint not to complain
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* about an unused variable or function parameter.
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*
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* A number of different annotations are used, depending on the
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* compiler or checker that is looking at the code.
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*
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* Note that some variants rename the parameter, so if you use
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* the parameter after all, you'll get a complaint about a missing
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* variable.
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*
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* You use it like this:
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*
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* void foo(int UNUSED(x)){}
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*/
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#ifndef UNUSED
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#if defined _lint
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# define UNUSED(v) /*lint -e(715,818)*/ v
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#elif defined(__GNUC__)
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# define UNUSED(v) UNUSED_ ## v __attribute((unused))
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#elif defined __LCLINT__
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# define UNUSED(v) /*@unused@*/ v
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#else
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# define UNUSED(v) _UNUSED_ ## v
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#endif
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#endif
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#define EXTERN extern /* used in *.h files */
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#define TRUE 1 /* used for turning integers into Booleans */
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#define FALSE 0 /* used for turning integers into Booleans */
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#define SUPER_USER ((uid_t) 0) /* uid_t of superuser */
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#include <sys/null.h> /* NULL Pointer */
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#define SCPVEC_NR 64 /* max # of entries in a SYS_VSAFECOPY request */
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#define MAPVEC_NR 64 /* max # of entries in a SYS_VUMAP request */
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#define NR_IOREQS 64 /* maximum number of entries in an iorequest */
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#define VUA_READ 0x01 /* for SYS_VUMAP: read access */
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#define VUA_WRITE 0x02 /* for SYS_VUMAP: write access */
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/* Message passing constants. */
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#define MESS_SIZE (sizeof(message)) /* might need usizeof from FS here */
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/* Memory related constants. */
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#define SEGMENT_TYPE 0xFF00 /* bit mask to get segment type */
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#define SEGMENT_INDEX 0x00FF /* bit mask to get segment index */
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#define PHYS_SEG 0x0400 /* flag indicating entire physical memory */
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#define LOCAL_VM_SEG 0x1000 /* same as LOCAL_SEG, but with vm lookup */
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#define MEM_GRANT 3
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#define VIR_ADDR 1
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#define VM_D (LOCAL_VM_SEG | VIR_ADDR)
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#define VM_GRANT (LOCAL_VM_SEG | MEM_GRANT)
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/* Labels used to disable code sections for different reasons. */
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#define DEAD_CODE 0 /* unused code in normal configuration */
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#define FUTURE_CODE 0 /* new code to be activated + tested later */
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#define TEMP_CODE 1 /* active code to be removed later */
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/* Miscellaneous */
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#define BYTE 0377 /* mask for 8 bits */
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#define READING 0 /* copy data to user */
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#define WRITING 1 /* copy data from user */
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#define PEEKING 2 /* retrieve FS data without copying */
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#define HAVE_SCATTERED_IO 1 /* scattered I/O is now standard */
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/* Memory is allocated in clicks. */
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#if defined(__i386__) || defined(__arm__)
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#define CLICK_SIZE 4096 /* unit in which memory is allocated */
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#define CLICK_SHIFT 12 /* log2 of CLICK_SIZE */
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#else
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#error Unsupported arch
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#endif
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/* Click alignment macros. */
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#define CLICK_FLOOR(n) (((vir_bytes)(n) / CLICK_SIZE) * CLICK_SIZE)
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#define CLICK_CEIL(n) CLICK_FLOOR((vir_bytes)(n) + CLICK_SIZE-1)
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/* Sizes of memory tables. The boot monitor distinguishes three memory areas,
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* namely low mem below 1M, 1M-16M, and mem after 16M. More chunks are needed
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* for DOS MINIX.
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*/
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#define NR_MEMS 16
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#define CLICK2ABS(v) ((v) << CLICK_SHIFT)
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#define ABS2CLICK(a) ((a) >> CLICK_SHIFT)
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/* Flag bits for i_mode in the inode. */
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#define I_TYPE 0170000 /* this field gives inode type */
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#define I_UNIX_SOCKET 0140000 /* unix domain socket */
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#define I_SYMBOLIC_LINK 0120000 /* file is a symbolic link */
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#define I_REGULAR 0100000 /* regular file, not dir or special */
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#define I_BLOCK_SPECIAL 0060000 /* block special file */
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#define I_DIRECTORY 0040000 /* file is a directory */
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#define I_CHAR_SPECIAL 0020000 /* character special file */
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#define I_NAMED_PIPE 0010000 /* named pipe (FIFO) */
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#define I_SET_UID_BIT 0004000 /* set effective uid_t on exec */
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#define I_SET_GID_BIT 0002000 /* set effective gid_t on exec */
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#define I_SET_STCKY_BIT 0001000 /* sticky bit */
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#define ALL_MODES 0007777 /* all bits for user, group and others */
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#define RWX_MODES 0000777 /* mode bits for RWX only */
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#define R_BIT 0000004 /* Rwx protection bit */
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#define W_BIT 0000002 /* rWx protection bit */
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#define X_BIT 0000001 /* rwX protection bit */
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#define I_NOT_ALLOC 0000000 /* this inode is free */
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/* Some limits. */
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#define MAX_INODE_NR ((ino_t) 037777777777) /* largest inode number */
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#define MAX_FILE_POS ((off_t) 0x7FFFFFFF) /* largest legal file offset */
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#define UMAX_FILE_POS ((unsigned) 0x7FFFFFFF) /* largest legal file offset */
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#define MAX_SYM_LOOPS 8 /* how many symbolic links are recursed */
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#define NO_BLOCK ((block_t) 0) /* absence of a block number */
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#define NO_ENTRY ((ino_t) 0) /* absence of a dir entry */
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#define NO_ZONE ((zone_t) 0) /* absence of a zone number */
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#define NO_DEV ((dev_t) 0) /* absence of a device numb */
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#define NO_LINK ((nlink_t) 0) /* absence of incoming links */
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#define INVAL_UID ((uid_t) -1) /* invalid uid value */
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#define INVAL_GID ((gid_t) -1) /* invalid gid value */
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#define SERVARNAME "cttyline"
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#define ARCHVARNAME "arch"
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#define BOARDVARNAME "board"
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#define SERBAUDVARNAME "cttybaud"
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/* Bits for s_flags in the privilege structure. */
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#define PREEMPTIBLE 0x002 /* kernel tasks are not preemptible */
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#define BILLABLE 0x004 /* some processes are not billable */
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#define DYN_PRIV_ID 0x008 /* privilege id assigned dynamically */
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#define SYS_PROC 0x010 /* system processes have own priv structure */
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#define CHECK_IO_PORT 0x020 /* check if I/O request is allowed */
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#define CHECK_IRQ 0x040 /* check if IRQ can be used */
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#define CHECK_MEM 0x080 /* check if (VM) mem map request is allowed */
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#define ROOT_SYS_PROC 0x100 /* this is a root system process instance */
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#define VM_SYS_PROC 0x200 /* this is a vm system process instance */
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#define LU_SYS_PROC 0x400 /* this is a live updated sys proc instance */
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#define RST_SYS_PROC 0x800 /* this is a restarted sys proc instance */
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/* Values for the "verbose" boot monitor variable */
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#define VERBOSEBOOT_QUIET 0
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#define VERBOSEBOOT_BASIC 1
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#define VERBOSEBOOT_EXTRA 2
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#define VERBOSEBOOT_MAX 3
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#define VERBOSEBOOTVARNAME "verbose"
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/* magic value to put in struct proc entries for sanity checks. */
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#define PMAGIC 0xC0FFEE1
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/* MINIX_KERNFLAGS flags */
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#define MKF_I386_INTEL_SYSENTER (1L << 0) /* SYSENTER available and supported */
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#define MKF_I386_AMD_SYSCALL (1L << 1) /* SYSCALL available and supported */
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#endif /* _MINIX_CONST_H */
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