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Similar to debug.iosize_max_clamp sysctl, introduce

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devfs_iosize_max_clamp sysctl, which allows/disables SSIZE_MAX-sized
i/o requests on the devfs files.

Sponsored by:	The FreeBSD Foundation
Reminded by:	Dmitry Sivachenko <trtrmitya@gmail.com>
MFC after:	1 week
This commit is contained in:
kib 2013-10-15 06:33:10 +00:00
parent 58fc49ff4f
commit 3dc87905fa
3 changed files with 10 additions and 0 deletions
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4
sys/fs/devfs/devfs_vnops.c
View File

@ -1178,6 +1178,8 @@ devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred,
struct cdevsw *dsw;
struct file *fpop;
if (uio->uio_resid > DEVFS_IOSIZE_MAX)
return (EINVAL);
fpop = td->td_fpop;
error = devfs_fp_check(fp, &dev, &dsw, &ref);
if (error)
@ -1653,6 +1655,8 @@ devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred,
struct cdevsw *dsw;
struct file *fpop;
if (uio->uio_resid > DEVFS_IOSIZE_MAX)
return (EINVAL);
fpop = td->td_fpop;
error = devfs_fp_check(fp, &dev, &dsw, &ref);
if (error)

4
sys/kern/sys_generic.c
View File

@ -78,6 +78,10 @@ __FBSDID("$FreeBSD$");
int iosize_max_clamp = 1;
SYSCTL_INT(_debug, OID_AUTO, iosize_max_clamp, CTLFLAG_RW,
&iosize_max_clamp, 0, "Clamp max i/o size to INT_MAX");
int devfs_iosize_max_clamp = 1;
SYSCTL_INT(_debug, OID_AUTO, devfs_iosize_max_clamp, CTLFLAG_RW,
&devfs_iosize_max_clamp, 0, "Clamp max i/o size to INT_MAX for devices");
/*
* Assert that the return value of read(2) and write(2) syscalls fits
* into a register. If not, an architecture will need to provide the

2
sys/sys/systm.h
View File

@ -146,7 +146,9 @@ extern const void *zero_region; /* address space maps to a zeroed page */
extern int unmapped_buf_allowed;
extern int iosize_max_clamp;
extern int devfs_iosize_max_clamp;
#define IOSIZE_MAX (iosize_max_clamp ? INT_MAX : SSIZE_MAX)
#define DEVFS_IOSIZE_MAX (devfs_iosize_max_clamp ? INT_MAX : SSIZE_MAX)
/*
* General function declarations.