From: Phillip Susi <psusi@cfl.rr.com>
To: linux-kernel@vger.kernel.org
Subject: [PATCH 1/2] Add partition resize function to BLKPG ioctl
Date: Wed, 30 Nov 2011 22:23:12 -0500 [thread overview]
Message-ID: <4ED6F320.5060709@cfl.rr.com> (raw)
In-Reply-To: <cover.1322709471.git.psusi@cfl.rr.com>
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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@cfl.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
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next parent reply other threads:[~2011-12-01 3:23 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1322709471.git.psusi@cfl.rr.com>
2011-12-01 3:23 ` Phillip Susi [this message]
2011-12-08 12:30 ` [PATCH 1/2] Add partition resize function to BLKPG ioctl Karel Zak
2011-12-08 14:22 ` Phillip Susi
2011-12-08 15:16 ` Karel Zak
2011-12-08 15:25 ` Phillip Susi
2011-12-08 15:58 ` Vivek Goyal
2011-12-08 16:06 ` Phillip Susi
2011-12-08 16:28 ` Vivek Goyal
2011-12-08 16:55 ` Phillip Susi
2011-12-09 2:53 ` Phillip Susi
2011-12-12 14:53 ` Vivek Goyal
2011-12-12 17:43 ` Phillip Susi
2011-12-12 17:49 ` Joe Perches
2011-12-12 18:04 ` Vivek Goyal
2011-12-13 0:15 ` Phillip Susi
2011-12-13 0:16 ` Phillip Susi
2011-12-13 0:16 ` [PATCH 2/2] Add BLKPG_GET_PARTITION operation Phillip Susi
2011-12-19 20:25 ` [PATCH 1/2] Add partition resize function to BLKPG ioctl Vivek Goyal
2011-12-21 1:53 ` Phillip Susi
2011-12-21 1:54 ` Phillip Susi
2011-12-21 1:54 ` [PATCH 2/2] Add BLKPG_GET_PARTITION operation Phillip Susi
2011-12-21 20:46 ` [PATCH 1/2] Add partition resize function to BLKPG ioctl Vivek Goyal
2011-12-24 21:36 ` Phillip Susi
2011-12-24 22:21 ` Phillip Susi
2011-12-24 22:21 ` [PATCH 2/2] Add BLKPG_GET_PARTITION operation Phillip Susi
2011-12-01 3:23 ` Phillip Susi
2011-12-08 12:35 ` Karel Zak
2011-12-08 14:25 ` Phillip Susi
2011-12-29 17:06 [PATCH 1/2] Add partition resize function to BLKPG ioctl Maxim Patlasov
2011-12-30 0:09 ` Phillip Susi
2012-01-01 21:49 ` Phillip Susi
2012-01-26 19:01 ` Vivek Goyal
2012-01-26 20:35 ` Phillip Susi
2012-01-26 21:04 ` Vivek Goyal
2012-01-26 21:48 ` Phillip Susi
2012-01-30 15:49 ` Vivek Goyal
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