From 572c48921574dbe6dceb958cf965aa962baefde4 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 8 Oct 2007 13:24:05 -0400
Subject: [PATCH] [PATCH] sanitize blkdev_get() and friends
* get rid of fake struct file/struct dentry in __blkdev_get()
* merge __blkdev_get() and do_open()
* get rid of flags argument of blkdev_get()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
drivers/block/pktcdvd.c | 4 +-
drivers/char/raw.c | 2 +-
drivers/s390/block/dasd_genhd.c | 2 +-
fs/block_dev.c | 65 +++++++++++----------------------
fs/ocfs2/cluster/heartbeat.c | 2 +-
fs/partitions/check.c | 2 +-
include/linux/fs.h | 2 +-
kernel/power/swap.c | 2 +-
8 files changed, 30 insertions(+), 51 deletions(-)
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index ce8c71901923..f20bf359b84f 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -2332,7 +2332,7 @@ static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
* so bdget() can't fail.
*/
bdget(pd->bdev->bd_dev);
- if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY)))
+ if ((ret = blkdev_get(pd->bdev, FMODE_READ)))
goto out;
if ((ret = bd_claim(pd->bdev, pd)))
@@ -2765,7 +2765,7 @@ static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
bdev = bdget(dev);
if (!bdev)
return -ENOMEM;
- ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK);
+ ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY);
if (ret)
return ret;
diff --git a/drivers/char/raw.c b/drivers/char/raw.c
index bfd59e6bf54f..f3cf5eb9b7fb 100644
--- a/drivers/char/raw.c
+++ b/drivers/char/raw.c
@@ -65,7 +65,7 @@ static int raw_open(struct inode *inode, struct file *filp)
if (!bdev)
goto out;
igrab(bdev->bd_inode);
- err = blkdev_get(bdev, filp->f_mode, 0);
+ err = blkdev_get(bdev, filp->f_mode);
if (err)
goto out;
err = bd_claim(bdev, raw_open);
diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c
index 3c1b6915c9ad..e99d566b69cc 100644
--- a/drivers/s390/block/dasd_genhd.c
+++ b/drivers/s390/block/dasd_genhd.c
@@ -99,7 +99,7 @@ int dasd_scan_partitions(struct dasd_block *block)
struct block_device *bdev;
bdev = bdget_disk(block->gdp, 0);
- if (!bdev || blkdev_get(bdev, FMODE_READ, 1) < 0)
+ if (!bdev || blkdev_get(bdev, FMODE_READ) < 0)
return -ENODEV;
/*
* See fs/partition/check.c:register_disk,rescan_partitions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 4b595904cefd..b89c956e04f6 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -844,9 +844,8 @@ struct block_device *open_by_devnum(dev_t dev, fmode_t mode)
{
struct block_device *bdev = bdget(dev);
int err = -ENOMEM;
- int flags = mode & FMODE_WRITE ? O_RDWR : O_RDONLY;
if (bdev)
- err = blkdev_get(bdev, mode, flags);
+ err = blkdev_get(bdev, mode);
return err ? ERR_PTR(err) : bdev;
}
@@ -975,8 +974,6 @@ void bd_set_size(struct block_device *bdev, loff_t size)
}
EXPORT_SYMBOL(bd_set_size);
-static int __blkdev_get(struct block_device *bdev, fmode_t mode, unsigned flags,
- int for_part);
static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part);
/*
@@ -986,7 +983,7 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part);
* mutex_lock_nested(whole->bd_mutex, 1)
*/
-static int do_open(struct block_device *bdev, struct file *file, int for_part)
+static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
{
struct gendisk *disk;
struct hd_struct *part = NULL;
@@ -994,9 +991,9 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
int partno;
int perm = 0;
- if (file->f_mode & FMODE_READ)
+ if (mode & FMODE_READ)
perm |= MAY_READ;
- if (file->f_mode & FMODE_WRITE)
+ if (mode & FMODE_WRITE)
perm |= MAY_WRITE;
/*
* hooks: /n/, see "layering violations".
@@ -1007,15 +1004,7 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
return ret;
}
- if (file->f_flags & O_NDELAY)
- file->f_mode |= FMODE_NDELAY;
- if (file->f_flags & O_EXCL)
- file->f_mode |= FMODE_EXCL;
- if ((file->f_flags & O_ACCMODE) == 3)
- file->f_mode |= FMODE_WRITE_IOCTL;
-
ret = -ENXIO;
- file->f_mapping = bdev->bd_inode->i_mapping;
lock_kernel();
@@ -1034,7 +1023,7 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
if (!partno) {
struct backing_dev_info *bdi;
if (disk->fops->open) {
- ret = disk->fops->open(bdev, file->f_mode);
+ ret = disk->fops->open(bdev, mode);
if (ret)
goto out_clear;
}
@@ -1054,7 +1043,7 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
if (!whole)
goto out_clear;
BUG_ON(for_part);
- ret = __blkdev_get(whole, file->f_mode, file->f_flags, 1);
+ ret = __blkdev_get(whole, mode, 1);
if (ret)
goto out_clear;
bdev->bd_contains = whole;
@@ -1075,7 +1064,7 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
disk = NULL;
if (bdev->bd_contains == bdev) {
if (bdev->bd_disk->fops->open) {
- ret = bdev->bd_disk->fops->open(bdev, file->f_mode);
+ ret = bdev->bd_disk->fops->open(bdev, mode);
if (ret)
goto out_unlock_bdev;
}
@@ -1095,7 +1084,7 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
bdev->bd_part = NULL;
bdev->bd_inode->i_data.backing_dev_info = &default_backing_dev_info;
if (bdev != bdev->bd_contains)
- __blkdev_put(bdev->bd_contains, file->f_mode, 1);
+ __blkdev_put(bdev->bd_contains, mode, 1);
bdev->bd_contains = NULL;
out_unlock_bdev:
mutex_unlock(&bdev->bd_mutex);
@@ -1111,28 +1100,9 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
return ret;
}
-static int __blkdev_get(struct block_device *bdev, fmode_t mode, unsigned flags,
- int for_part)
+int blkdev_get(struct block_device *bdev, fmode_t mode)
{
- /*
- * This crockload is due to bad choice of ->open() type.
- * It will go away.
- * For now, block device ->open() routine must _not_
- * examine anything in 'inode' argument except ->i_rdev.
- */
- struct file fake_file = {};
- struct dentry fake_dentry = {};
- fake_file.f_mode = mode;
- fake_file.f_flags = flags;
- fake_file.f_path.dentry = &fake_dentry;
- fake_dentry.d_inode = bdev->bd_inode;
-
- return do_open(bdev, &fake_file, for_part);
-}
-
-int blkdev_get(struct block_device *bdev, fmode_t mode, unsigned flags)
-{
- return __blkdev_get(bdev, mode, flags, 0);
+ return __blkdev_get(bdev, mode, 0);
}
EXPORT_SYMBOL(blkdev_get);
@@ -1149,15 +1119,24 @@ static int blkdev_open(struct inode * inode, struct file * filp)
*/
filp->f_flags |= O_LARGEFILE;
+ if (filp->f_flags & O_NDELAY)
+ filp->f_mode |= FMODE_NDELAY;
+ if (filp->f_flags & O_EXCL)
+ filp->f_mode |= FMODE_EXCL;
+ if ((filp->f_flags & O_ACCMODE) == 3)
+ filp->f_mode |= FMODE_WRITE_IOCTL;
+
bdev = bd_acquire(inode);
if (bdev == NULL)
return -ENOMEM;
- res = do_open(bdev, filp, 0);
+ filp->f_mapping = bdev->bd_inode->i_mapping;
+
+ res = blkdev_get(bdev, filp->f_mode);
if (res)
return res;
- if (!(filp->f_flags & O_EXCL) )
+ if (!(filp->f_mode & FMODE_EXCL))
return 0;
if (!(res = bd_claim(bdev, filp)))
@@ -1327,7 +1306,7 @@ struct block_device *open_bdev_exclusive(const char *path, fmode_t mode, void *h
if (IS_ERR(bdev))
return bdev;
- error = blkdev_get(bdev, mode, 0);
+ error = blkdev_get(bdev, mode);
if (error)
return ERR_PTR(error);
error = -EACCES;
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 4b6fdf591eed..6ebaa58e2c03 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -1268,7 +1268,7 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg,
goto out;
reg->hr_bdev = I_BDEV(filp->f_mapping->host);
- ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ, 0);
+ ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ);
if (ret) {
reg->hr_bdev = NULL;
goto out;
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 5a35ff2e1a9b..633f7a0ebb2c 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -485,7 +485,7 @@ void register_disk(struct gendisk *disk)
goto exit;
bdev->bd_invalidated = 1;
- err = blkdev_get(bdev, FMODE_READ, 0);
+ err = blkdev_get(bdev, FMODE_READ);
if (err < 0)
goto exit;
blkdev_put(bdev, FMODE_READ);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index c6766314dc5e..cb78e389699b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1722,7 +1722,7 @@ extern int blkdev_driver_ioctl(struct inode *inode, struct file *file,
struct gendisk *disk, unsigned cmd,
unsigned long arg);
extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
-extern int blkdev_get(struct block_device *, fmode_t, unsigned);
+extern int blkdev_get(struct block_device *, fmode_t);
extern int blkdev_put(struct block_device *, fmode_t);
extern int bd_claim(struct block_device *, void *);
extern void bd_release(struct block_device *);
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 178b001a4f17..b7713b53d07a 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -172,7 +172,7 @@ static int swsusp_swap_check(void) /* This is called before saving image */
return res;
root_swap = res;
- res = blkdev_get(resume_bdev, FMODE_WRITE, O_RDWR);
+ res = blkdev_get(resume_bdev, FMODE_WRITE);
if (res)
return res;