c7fbafe1ad
These days, DEV_OPEN calls to character drivers block the calling thread until completion or failure, and thus never return SUSPEND to the caller. The same already applied to BDEV_OPEN calls to block drivers. It has thus become impossible for a process to enter a state of being blocked on a device open call. There is currently no support for restarting device open calls to restarted character drivers. This support was present in the _DOPEN logic, but was already no longer triggering. In the future, this case should be handled by the thread performing the open request. Change-Id: I6cc1e7b4c9ed116c6ce160b315e6e060124dce00
55 lines
1.9 KiB
C
55 lines
1.9 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 8 /* # 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_LOCK 2 /* susp'd on 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_OTHER 5 /* blocked on other process, check
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fp_task to find out */
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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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/* test if reply is a driver reply */
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#define IS_DRV_REPLY(x) (IS_DEV_RS(x) || IS_BDEV_RS(x))
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#define DUP_MASK 0100 /* mask to distinguish dup2 from dup */
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#define LOOK_UP 0 /* tells search_dir to lookup string */
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#define ENTER 1 /* tells search_dir to make dir entry */
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#define DELETE 2 /* tells search_dir to delete entry */
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#define IS_EMPTY 3 /* tells search_dir to ret. OK or ENOTEMPTY */
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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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* M3_LONG_STRING.
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*/
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#define FSTYPE_MAX VFS_NAMELEN /* maximum file system type size */
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/* Args to dev_io */
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#define VFS_DEV_READ 2001
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#define VFS_DEV_WRITE 2002
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#define VFS_DEV_IOCTL 2005
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#define VFS_DEV_SELECT 2006
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#define dev_style_asyn(n) (TRUE)
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#endif
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