7 files changed, 68 insertions, 27 deletions

diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index 3d3e7a46f38c..67eb93cff699 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -677,6 +677,29 @@ static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
         case DVD_WRITE_STRUCT:
         case DVD_AUTH:
                 arg = (unsigned long)compat_ptr(arg);
+        /* These intepret arg as an unsigned long, not as a pointer,
+         * so we must not do compat_ptr() conversion. */
+        case HDIO_SET_MULTCOUNT:
+        case HDIO_SET_UNMASKINTR:
+        case HDIO_SET_KEEPSETTINGS:
+        case HDIO_SET_32BIT:
+        case HDIO_SET_NOWERR:
+        case HDIO_SET_DMA:
+        case HDIO_SET_PIO_MODE:
+        case HDIO_SET_NICE:
+        case HDIO_SET_WCACHE:
+        case HDIO_SET_ACOUSTIC:
+        case HDIO_SET_BUSSTATE:
+        case HDIO_SET_ADDRESS:
+        case CDROMEJECT_SW:
+        case CDROM_SET_OPTIONS:
+        case CDROM_CLEAR_OPTIONS:
+        case CDROM_SELECT_SPEED:
+        case CDROM_SELECT_DISC:
+        case CDROM_MEDIA_CHANGED:
+        case CDROM_DRIVE_STATUS:
+        case CDROM_LOCKDOOR:
+        case CDROM_DEBUG:
                 break;
         default:
                 /* unknown ioctl number */
@@ -699,8 +722,14 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
         struct backing_dev_info *bdi;
         loff_t size;
 
+        /*
+         * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
+         * to updated it before every ioctl.
+         */
         if (file->f_flags & O_NDELAY)
-                mode |= FMODE_NDELAY_NOW;
+                mode |= FMODE_NDELAY;
+        else
+                mode &= ~FMODE_NDELAY;
 
         switch (cmd) {
         case HDIO_GETGEO:
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index f20bf359b84f..edda7b6b077b 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -2790,7 +2790,7 @@ static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
         return 0;
 
 out_mem:
-        blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
+        blkdev_put(bdev, FMODE_READ | FMODE_NDELAY);
         /* This is safe: open() is still holding a reference. */
         module_put(THIS_MODULE);
         return ret;
@@ -2975,7 +2975,7 @@ static int pkt_remove_dev(dev_t pkt_dev)
         pkt_debugfs_dev_remove(pd);
         pkt_sysfs_dev_remove(pd);
 
-        blkdev_put(pd->bdev, FMODE_READ|FMODE_WRITE);
+        blkdev_put(pd->bdev, FMODE_READ | FMODE_NDELAY);
 
         remove_proc_entry(pd->name, pkt_proc);
         DPRINTK(DRIVER_NAME": writer %s unmapped\n", pd->name);
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index c9e1242eaf25..5081b3981d3c 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -757,7 +757,7 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
          * access to the device is prohibited.
          */
         error = scsi_nonblockable_ioctl(sdp, cmd, p,
-                                        (mode & FMODE_NDELAY_NOW) != 0);
+                                        (mode & FMODE_NDELAY) != 0);
         if (!scsi_block_when_processing_errors(sdp) || !error)
                 return error;
 
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 62b6633e3a97..45b66b98a516 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -521,7 +521,7 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
          * if it doesn't recognise the ioctl
          */
         ret = scsi_nonblockable_ioctl(sdev, cmd, argp,
-                                        (mode & FMODE_NDELAY_NOW) != 0);
+                                        (mode & FMODE_NDELAY) != 0);
         if (ret != -ENODEV)
                 return ret;
         return scsi_ioctl(sdev, cmd, argp);
diff --git a/fs/block_dev.c b/fs/block_dev.c
index db831efbdbbd..99e0ae1a4c78 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1135,12 +1135,15 @@ static int blkdev_open(struct inode * inode, struct file * filp)
         if (res)
                 return res;
 
-        if (!(filp->f_mode & FMODE_EXCL))
-                return 0;
+        if (filp->f_mode & FMODE_EXCL) {
+                res = bd_claim(bdev, filp);
+                if (res)
+                        goto out_blkdev_put;
+        }
 
-        if (!(res = bd_claim(bdev, filp)))
-                return 0;
+        return 0;
 
+ out_blkdev_put:
         blkdev_put(bdev, filp->f_mode);
         return res;
 }
@@ -1203,8 +1206,16 @@ static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 {
         struct block_device *bdev = I_BDEV(file->f_mapping->host);
         fmode_t mode = file->f_mode;
+
+        /*
+         * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
+         * to updated it before every ioctl.
+         */
         if (file->f_flags & O_NDELAY)
-                mode |= FMODE_NDELAY_NOW;
+                mode |= FMODE_NDELAY;
+        else
+                mode &= ~FMODE_NDELAY;
+
         return blkdev_ioctl(bdev, mode, cmd, arg);
 }
 
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0dcdd9458f4b..4a853ef6fd35 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -63,23 +63,24 @@ extern int dir_notify_enable;
 #define MAY_ACCESS 16
 #define MAY_OPEN 32
 
-#define FMODE_READ ((__force fmode_t)1)
-#define FMODE_WRITE ((__force fmode_t)2)
-
-/* Internal kernel extensions */
-#define FMODE_LSEEK     ((__force fmode_t)4)
-#define FMODE_PREAD     ((__force fmode_t)8)
-#define FMODE_PWRITE    FMODE_PREAD     /* These go hand in hand */
-
-/* File is being opened for execution. Primary users of this flag are
-   distributed filesystems that can use it to achieve correct ETXTBUSY
-   behavior for cross-node execution/opening_for_writing of files */
-#define FMODE_EXEC      ((__force fmode_t)16)
-
-#define FMODE_NDELAY    ((__force fmode_t)32)
-#define FMODE_EXCL      ((__force fmode_t)64)
+/* file is open for reading */
+#define FMODE_READ              ((__force fmode_t)1)
+/* file is open for writing */
+#define FMODE_WRITE             ((__force fmode_t)2)
+/* file is seekable */
+#define FMODE_LSEEK             ((__force fmode_t)4)
+/* file can be accessed using pread/pwrite */
+#define FMODE_PREAD             ((__force fmode_t)8)
+#define FMODE_PWRITE            FMODE_PREAD     /* These go hand in hand */
+/* File is opened for execution with sys_execve / sys_uselib */
+#define FMODE_EXEC              ((__force fmode_t)16)
+/* File is opened with O_NDELAY (only set for block devices) */
+#define FMODE_NDELAY            ((__force fmode_t)32)
+/* File is opened with O_EXCL (only set for block devices) */
+#define FMODE_EXCL              ((__force fmode_t)64)
+/* File is opened using open(.., 3, ..) and is writeable only for ioctls
+   (specialy hack for floppy.c) */
 #define FMODE_WRITE_IOCTL       ((__force fmode_t)128)
-#define FMODE_NDELAY_NOW        ((__force fmode_t)256)
 
 #define RW_MASK         1
 #define RWA_MASK        2
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index b7713b53d07a..6da14358537c 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -633,7 +633,7 @@ void swsusp_close(fmode_t mode)
                 return;
         }
 
-        blkdev_put(resume_bdev, mode); /* move up */
+        blkdev_put(resume_bdev, mode);
 }
 
 static int swsusp_header_init(void)