232819dd49
Previously, VFS would use various subsets of a number of fproc structure fields to store state when the process is blocked (suspended) for various reasons. As a result, there was a fair amount of abuse of fields, hidden state, and confusion as to which fields were used with which suspension states. Instead, the suspension state is now split into per-state structures, which are then stored in a union. Each of the union's structures should be accessed only right before, during, and right after the fp_blocked_on field is set to the corresponding blocking type. As a result, it is now very clear which fields are in use at which times, and we even save a bit of memory as a side effect. Change-Id: I5c24e353b6cb0c32eb41c70f89c5cfb23f6c93df
48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
#ifndef __VFS_CONST_H__
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#define __VFS_CONST_H__
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/* Tables sizes */
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#define NR_FILPS 1024 /* # slots in filp table */
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#define NR_LOCKS 8 /* # slots in the file locking table */
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#define NR_MNTS 16 /* # slots in mount table */
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#define NR_VNODES 1024 /* # slots in vnode table */
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#define NR_WTHREADS 9 /* # slots in worker thread table */
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#define NR_NONEDEVS NR_MNTS /* # slots in nonedev bitmap */
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/* Miscellaneous constants */
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#define SU_UID ((uid_t) 0) /* super_user's uid_t */
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#define SYS_UID ((uid_t) 0) /* uid_t for system processes and INIT */
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#define SYS_GID ((gid_t) 0) /* gid_t for system processes and INIT */
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#define FP_BLOCKED_ON_NONE 0 /* not blocked */
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#define FP_BLOCKED_ON_PIPE 1 /* susp'd on pipe */
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#define FP_BLOCKED_ON_FLOCK 2 /* susp'd on file lock */
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#define FP_BLOCKED_ON_POPEN 3 /* susp'd on pipe open */
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#define FP_BLOCKED_ON_SELECT 4 /* susp'd on select */
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#define FP_BLOCKED_ON_CDEV 5 /* blocked on character device I/O */
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/* test if the process is blocked on something */
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#define fp_is_blocked(fp) ((fp)->fp_blocked_on != FP_BLOCKED_ON_NONE)
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#define INVALID_THREAD ((thread_t) -1) /* known-invalid thread ID */
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#define SYMLOOP 16
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#define LABEL_MAX 16 /* maximum label size (including '\0'). Should
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* not be smaller than 16 or bigger than
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* M_PATH_STRING_MAX.
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*/
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#define FSTYPE_MAX VFS_NAMELEN /* maximum file system type size */
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/* possible select() operation types; read, write, errors */
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#define SEL_RD CDEV_OP_RD
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#define SEL_WR CDEV_OP_WR
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#define SEL_ERR CDEV_OP_ERR
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#define SEL_NOTIFY CDEV_NOTIFY /* not a real select operation */
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/* special driver endpoint for CTTY_MAJOR; must be able to pass isokendpt() */
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#define CTTY_ENDPT VFS_PROC_NR
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#endif
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