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Chop DIOCGDELETE from userland up in 1024 sector chunks to give geom_disk

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or any other bio chopping geom a reasonable size of work.

Check for delivered signals between chunks, because the request size
and service time is unbounded.
This commit is contained in:
Poul-Henning Kamp 2007-12-16 19:38:26 +00:00
parent bfa0795b00
commit 015a11e695
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=174674
1 changed files with 18 additions and 2 deletions
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20
sys/geom/geom_dev.c
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@ -245,7 +245,7 @@ g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread
struct g_geom *gp;
struct g_consumer *cp;
struct g_kerneldump kd;
off_t offset, length;
off_t offset, length, chunk;
int i, error;
u_int u;
@ -308,7 +308,23 @@ g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread
error = EINVAL;
break;
}
error = g_delete_data(cp, offset, length);
while (length > 0) {
chunk = length;
if (chunk > 1024 * cp->provider->sectorsize)
chunk = 1024 * cp->provider->sectorsize;
error = g_delete_data(cp, offset, chunk);
length -= chunk;
offset += chunk;
if (error)
break;
/*
* Since the request size is unbounded, the service
* time is likewise. We make this ioctl interruptible
* by checking for signals for each bio.
*/
if (SIGPENDING(td))
break;
}
break;
case DIOCGIDENT:
error = g_io_getattr("GEOM::ident", cp, &i, data);