Messages in this thread Patch in this message |  | | Date | Mon, 12 Nov 2001 20:39:22 -0600 | From | "Malcolm H. Teas" <> | Subject | [PATCH] Ramdisk ioctl bug fix, kernel 2.4.14 |
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The patch below makes the ramdisk return the actual size that is currently allocated instead of returning the max size we can possibly allocate. Affects system calls ioctl(filedes, BLKGETSIZE) and ioctl(filedes, BLKGETSIZE64) for ramdisk devices.
Malcolm Teas mhteas@btech.com http://www.btech.com Austin, TX USA
--- linux-2.4.14/drivers/block/rd.c Thu Oct 25 15:58:35 2001 +++ linux/drivers/block/rd.c Mon Nov 12 20:15:16 2001 @@ -40,6 +40,9 @@ * * Make block size and block size shift for RAM disks a global macro * and set blk_size for -ENOSPC, Werner Fink <werner@suse.de>, Apr '99 + * + * Make BLKGETSIZE and BLKGETSIZE64 return the actual allocated size, not + * the max possible allocated size - Malcolm Teas Nov 2001 */
#include <linux/config.h> @@ -349,6 +352,7 @@ { int error = -EINVAL; unsigned int minor; + unsigned long size;
if (!inode || !inode->i_rdev) goto out; @@ -373,10 +377,12 @@ case BLKGETSIZE: /* Return device size */ if (!arg) break; - error = put_user(rd_kbsize[minor] << 1, (unsigned long *) arg); + size = (rd_bdev[minor]->bd_inode->i_mapping->nrpages * PAGE_SIZE) >> 9; + error = put_user(size, (unsigned long *) arg); break; case BLKGETSIZE64: - error = put_user((u64)rd_kbsize[minor]<<10, (u64*)arg); + size = rd_bdev[minor]->bd_inode->i_mapping->nrpages; + error = put_user((u64) (size * PAGE_SIZE), (u64*)arg); break; case BLKROSET: case BLKROGET: - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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