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Message-ID: <4ED6F320.5060709@cfl.rr.com>
Date: Wed, 30 Nov 2011 22:23:12 -0500
From: Phillip Susi <psusi@....rr.com>
To: linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] Add partition resize function to BLKPG ioctl
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Add a new operation code ( BLKPG_RES_PARTITION ) to the
BLKPG ioctl that allows altering the size of an existing
partition, even if it is currently in use.
Signed-off-by: Phillip Susi <psusi@....rr.com>
- ---
block/ioctl.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++-
include/linux/blkpg.h | 1 +
2 files changed, 50 insertions(+), 2 deletions(-)
diff --git a/block/ioctl.c b/block/ioctl.c
index ca939fc..f97e6a4 100644
- --- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -36,8 +36,8 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
case BLKPG_ADD_PARTITION:
start = p.start >> 9;
length = p.length >> 9;
- - /* check for fit in a hd_struct */
- - if (sizeof(sector_t) == sizeof(long) &&
+ /* check for fit in a hd_struct */
+ if (sizeof(sector_t) == sizeof(long) &&
sizeof(long long) > sizeof(long)) {
long pstart = start, plength = length;
if (pstart != start || plength != length
@@ -92,6 +92,53 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
bdput(bdevp);
return 0;
+ case BLKPG_RES_PARTITION:
+ start = p.start >> 9;
+ length = p.length >> 9;
+ /* check for fit in a hd_struct */
+ if (sizeof(sector_t) == sizeof(long) &&
+ sizeof(long long) > sizeof(long)) {
+ long pstart = start, plength = length;
+ if (pstart != start || plength != length
+ || pstart < 0 || plength < 0)
+ return -EINVAL;
+ }
+
+ mutex_lock(&bdev->bd_mutex);
+
+ /* overlap? */
+ disk_part_iter_init(&piter, disk,
+ DISK_PITER_INCL_EMPTY);
+ while ((part = disk_part_iter_next(&piter))) {
+ if (part->partno != partno && !(start + length <= part->start_sect ||
+ start >= part->start_sect + part->nr_sects)) {
+ disk_part_iter_exit(&piter);
+ mutex_unlock(&bdev->bd_mutex);
+ return -EBUSY;
+ }
+ }
+ disk_part_iter_exit(&piter);
+ part = disk_get_part(disk, partno);
+ if (!part)
+ {
+ mutex_unlock(&bdev->bd_mutex);
+ return -ENXIO;
+ }
+ if (start != part->start_sect)
+ {
+ mutex_unlock(&bdev->bd_mutex);
+ disk_put_part(part);
+ return -EINVAL;
+ }
+ part->nr_sects = length;
+ bdevp = bdget(part_devt(part));
+ mutex_lock(&bdevp->bd_mutex);
+ i_size_write(bdevp->bd_inode, p.length);
+ mutex_unlock(&bdevp->bd_mutex);
+ bdput(bdevp);
+ disk_put_part(part);
+ mutex_unlock(&bdev->bd_mutex);
+ return 0;
default:
return -EINVAL;
}
diff --git a/include/linux/blkpg.h b/include/linux/blkpg.h
index faf8a45..103da38 100644
- --- a/include/linux/blkpg.h
+++ b/include/linux/blkpg.h
@@ -40,6 +40,7 @@ struct blkpg_ioctl_arg {
/* The subfunctions (for the op field) */
#define BLKPG_ADD_PARTITION 1
#define BLKPG_DEL_PARTITION 2
+#define BLKPG_RES_PARTITION 3
/* Sizes of name fields. Unused at present. */
#define BLKPG_DEVNAMELTH 64
- --
1.7.5.4
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
iEYEARECAAYFAk7W8yAACgkQJ4UciIs+XuKpiwCfd8YC2241ScOcruAoGvBnTyVZ
p6UAoI5JT/UX4gkilpjmTKbuBLzeCTv4
=K/d3
-----END PGP SIGNATURE-----
--
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