diff options
Diffstat (limited to 'storeio/dev.h')
| -rw-r--r-- | storeio/dev.h | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/storeio/dev.h b/storeio/dev.h index 7927f80d..a4321399 100644 --- a/storeio/dev.h +++ b/storeio/dev.h @@ -1,6 +1,6 @@ /* store `device' I/O - Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc. + Copyright (C) 1995, 1996, 1997, 1999 Free Software Foundation, Inc. Written by Miles Bader <miles@gnu.ai.mit.edu> @@ -32,6 +32,20 @@ struct dev /* The device to which we're doing io. */ struct store *store; + /* The current owner of the open device. For terminals, this affects + controlling terminal behavior (see term_become_ctty). For all objects + this affects old-style async IO. Negative values represent pgrps. This + has nothing to do with the owner of a file (as returned by io_stat, and + as used for various permission checks by filesystems). An owner of 0 + indicates that there is no owner. */ + pid_t owner; + + /* Nonzero iff the --no-cache flag was given. + If this is set, the remaining members are not used at all + and don't need to be initialized or cleaned up. */ + int inhibit_cache; + + /* A bitmask corresponding to the part of an offset that lies within a device block. */ unsigned block_mask; @@ -50,21 +64,14 @@ struct dev struct pager *pager; struct mutex pager_lock; - - /* The current owner of the open device. For terminals, this affects - controlling terminal behavior (see term_become_ctty). For all objects - this affects old-style async IO. Negative values represent pgrps. This - has nothing to do with the owner of a file (as returned by io_stat, and - as used for various permission checks by filesystems). An owner of 0 - indicates that there is no owner. */ - pid_t owner; }; /* Returns a pointer to a new device structure in DEV for the device NAME, with the given FLAGS. If BLOCK_SIZE is non-zero, it should be the desired block size, and must be a multiple of the device block size. If an error occurs, the error code is returned, otherwise 0. */ -error_t dev_open (struct store_parsed *name, int flags, struct dev **dev); +error_t dev_open (struct store_parsed *name, int flags, int inhibit_cache, + struct dev **dev); /* Free DEV and any resources it consumes. */ void dev_close (struct dev *dev); |