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allow resizing of ramdisks.

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This commit is contained in:
Ben Gras 2009-09-22 13:57:21 +00:00
parent a97c9633ff
commit 6492bf0019
1 changed files with 51 additions and 3 deletions
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54
drivers/memory/memory.c
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@ -46,11 +46,14 @@ PRIVATE struct kinfo kinfo; /* kernel information */
extern int errno; /* error number for PM calls */
PRIVATE int openct[NR_DEVS];
FORWARD _PROTOTYPE( char *m_name, (void) );
FORWARD _PROTOTYPE( struct device *m_prepare, (int device) );
FORWARD _PROTOTYPE( int m_transfer, (int proc_nr, int opcode, u64_t position,
iovec_t *iov, unsigned nr_req, int safe));
FORWARD _PROTOTYPE( int m_do_open, (struct driver *dp, message *m_ptr) );
FORWARD _PROTOTYPE( int m_do_close, (struct driver *dp, message *m_ptr) );
FORWARD _PROTOTYPE( void m_init, (void) );
FORWARD _PROTOTYPE( int m_ioctl, (struct driver *dp, message *m_ptr, int safe));
FORWARD _PROTOTYPE( void m_geometry, (struct partition *entry) );
@ -59,7 +62,7 @@ FORWARD _PROTOTYPE( void m_geometry, (struct partition *entry) );
PRIVATE struct driver m_dtab = {
m_name, /* current device's name */
m_do_open, /* open or mount */
do_nop, /* nothing on a close */
m_do_close, /* nothing on a close */
m_ioctl, /* specify ram disk geometry */
m_prepare, /* prepare for I/O on a given minor device */
m_transfer, /* do the I/O */
@ -307,9 +310,40 @@ message *m_ptr;
return r;
}
}
if(m_device < 0 || m_device >= NR_DEVS) {
panic("MEM","wrong m_device",m_device);
}
openct[m_device]++;
return(OK);
}
/*===========================================================================*
* m_do_close *
*===========================================================================*/
PRIVATE int m_do_close(dp, m_ptr)
struct driver *dp;
message *m_ptr;
{
int r;
if (m_prepare(m_ptr->DEVICE) == NIL_DEV) return(ENXIO);
if(m_device < 0 || m_device >= NR_DEVS) {
panic("MEM","wrong m_device",m_device);
}
if(openct[m_device] < 1) {
panic("MEM","closed too often",NO_NUM);
}
openct[m_device]--;
return(OK);
}
/*===========================================================================*
* m_init *
*===========================================================================*/
@ -343,6 +377,9 @@ PRIVATE void m_init()
dev_zero[i] = '\0';
}
for(i = 0; i < NR_DEVS; i++)
openct[i] = 0;
/* Set up memory range for /dev/mem. */
m_geom[MEM_DEV].dv_base = cvul64(0);
m_geom[MEM_DEV].dv_size = cvul64(0xffffffff);
@ -393,9 +430,20 @@ int safe;
if(m_vaddrs[dev] && !cmp64(dv->dv_size, cvul64(ramdev_size))) {
return(OK);
}
/* openct is 1 for the ioctl(). */
if(openct[dev] != 1) {
printf("MEM: MIOCRAMSIZE: %d in use (count %d)\n",
dev, openct[dev]);
return(EBUSY);
}
if(m_vaddrs[dev]) {
printf("MEM: MIOCRAMSIZE: %d already has a ramdisk\n", dev);
return(EPERM);
u32_t size;
if(ex64hi(dv->dv_size)) {
panic("MEM","huge old ramdisk", NO_NUM);
}
size = ex64lo(dv->dv_size);
munmap((void *) m_vaddrs[dev], size);
m_vaddrs[dev] = (vir_bytes) NULL;
}
#if DEBUG