aboutsummaryrefslogtreecommitdiff
path: root/drivers/block
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2009-03-26 16:03:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-03-26 16:03:04 -0700
commit86d9c070175de65890794fa227b68297da6206d8 (patch)
tree1aa4f1d1ecf397bd0d745a67b9d828420a99a8b4 /drivers/block
parent413e3376485e6cf81f4cf6a4dbc0de0326535093 (diff)
parenta2a9537ac0b37a5da6fbe7e1e9cb06c524d2a9c4 (diff)
Merge branch 'for-2.6.30' of git://git.kernel.dk/linux-2.6-block
* 'for-2.6.30' of git://git.kernel.dk/linux-2.6-block: Get rid of pdflush_operation() in emergency sync and remount btrfs: get rid of current_is_pdflush() in btrfs_btree_balance_dirty Move the default_backing_dev_info out of readahead.c and into backing-dev.c block: Repeated lines in switching-sched.txt bsg: Remove bogus check against request_queue->max_sectors block: WARN in __blk_put_request() for potential bio leak loop: fix circular locking in loop_clr_fd() loop: support barrier writes bsg: add support for tail queuing cpqarray: enable bus mastering block: genhd.h cleanup patch block: add private bio_set for bio integrity allocations block: genhd.h comment needs updating block: get rid of unused blkdev_free_rq() define block: remove various blk_queue_*() setting functions in blk_init_queue_node() cciss: add BUILD_BUG_ON() for catching bad CommandList_struct alignment block: don't create bio_vec slabs of less than the inline number block: cleanup bio_alloc_bioset()
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/cciss.c7
-rw-r--r--drivers/block/cpqarray.c1
-rw-r--r--drivers/block/loop.c48
3 files changed, 52 insertions, 4 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 4f9b6d79201..5d0e135824f 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3898,6 +3898,13 @@ static struct pci_driver cciss_pci_driver = {
*/
static int __init cciss_init(void)
{
+ /*
+ * The hardware requires that commands are aligned on a 64-bit
+ * boundary. Given that we use pci_alloc_consistent() to allocate an
+ * array of them, the size must be a multiple of 8 bytes.
+ */
+ BUILD_BUG_ON(sizeof(CommandList_struct) % 8);
+
printk(KERN_INFO DRIVER_NAME "\n");
/* Register for our PCI devices */
diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c
index 5d39df14ed9..ca268ca1115 100644
--- a/drivers/block/cpqarray.c
+++ b/drivers/block/cpqarray.c
@@ -617,6 +617,7 @@ static int cpqarray_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
int i;
c->pci_dev = pdev;
+ pci_set_master(pdev);
if (pci_enable_device(pdev)) {
printk(KERN_ERR "cpqarray: Unable to Enable PCI device\n");
return -1;
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index bf034557767..2621ed2ce6d 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -474,10 +474,35 @@ static int do_bio_filebacked(struct loop_device *lo, struct bio *bio)
int ret;
pos = ((loff_t) bio->bi_sector << 9) + lo->lo_offset;
- if (bio_rw(bio) == WRITE)
+
+ if (bio_rw(bio) == WRITE) {
+ int barrier = bio_barrier(bio);
+ struct file *file = lo->lo_backing_file;
+
+ if (barrier) {
+ if (unlikely(!file->f_op->fsync)) {
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
+ ret = vfs_fsync(file, file->f_path.dentry, 0);
+ if (unlikely(ret)) {
+ ret = -EIO;
+ goto out;
+ }
+ }
+
ret = lo_send(lo, bio, pos);
- else
+
+ if (barrier && !ret) {
+ ret = vfs_fsync(file, file->f_path.dentry, 0);
+ if (unlikely(ret))
+ ret = -EIO;
+ }
+ } else
ret = lo_receive(lo, bio, lo->lo_blocksize, pos);
+
+out:
return ret;
}
@@ -826,6 +851,9 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
lo->lo_queue->queuedata = lo;
lo->lo_queue->unplug_fn = loop_unplug;
+ if (!(lo_flags & LO_FLAGS_READ_ONLY) && file->f_op->fsync)
+ blk_queue_ordered(lo->lo_queue, QUEUE_ORDERED_DRAIN, NULL);
+
set_capacity(lo->lo_disk, size);
bd_set_size(bdev, size << 9);
@@ -941,11 +969,18 @@ static int loop_clr_fd(struct loop_device *lo, struct block_device *bdev)
bd_set_size(bdev, 0);
mapping_set_gfp_mask(filp->f_mapping, gfp);
lo->lo_state = Lo_unbound;
- fput(filp);
/* This is safe: open() is still holding a reference. */
module_put(THIS_MODULE);
if (max_part > 0)
ioctl_by_bdev(bdev, BLKRRPART, 0);
+ mutex_unlock(&lo->lo_ctl_mutex);
+ /*
+ * Need not hold lo_ctl_mutex to fput backing file.
+ * Calling fput holding lo_ctl_mutex triggers a circular
+ * lock dependency possibility warning as fput can take
+ * bd_mutex which is usually taken before lo_ctl_mutex.
+ */
+ fput(filp);
return 0;
}
@@ -1163,7 +1198,7 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode,
struct loop_device *lo = bdev->bd_disk->private_data;
int err;
- mutex_lock(&lo->lo_ctl_mutex);
+ mutex_lock_nested(&lo->lo_ctl_mutex, 1);
switch (cmd) {
case LOOP_SET_FD:
err = loop_set_fd(lo, mode, bdev, arg);
@@ -1172,7 +1207,10 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode,
err = loop_change_fd(lo, bdev, arg);
break;
case LOOP_CLR_FD:
+ /* loop_clr_fd would have unlocked lo_ctl_mutex on success */
err = loop_clr_fd(lo, bdev);
+ if (!err)
+ goto out_unlocked;
break;
case LOOP_SET_STATUS:
err = loop_set_status_old(lo, (struct loop_info __user *) arg);
@@ -1190,6 +1228,8 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode,
err = lo->ioctl ? lo->ioctl(lo, cmd, arg) : -EINVAL;
}
mutex_unlock(&lo->lo_ctl_mutex);
+
+out_unlocked:
return err;
}