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target: Fix bug in handling of FILEIO + block_device resize ops 

This patch fixes a bug in the handling of FILEIO w/ underlying block_device
resize operations where the original fd_dev->fd_dev_size was incorrectly being
used in fd_get_blocks() for READ_CAPACITY response payloads.

This patch avoids using fd_dev->fd_dev_size for FILEIO devices with
an underlying block_device, and instead changes fd_get_blocks() to
get the sector count directly from i_size_read() as recommended by hch.

Reported-by: Christoph Hellwig <hch@lst.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2012-05-16 16:05:26 -07:00
parent edc318d9fe
commit cd9323fd68
1 changed files with 16 additions and 6 deletions
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22
drivers/target/target_core_file.c
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@ -169,6 +169,7 @@ static struct se_device *fd_create_virtdevice(
inode = file->f_mapping->host;
if (S_ISBLK(inode->i_mode)) {
struct request_queue *q;
unsigned long long dev_size;
/*
* Setup the local scope queue_limits from struct request_queue->limits
* to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
@ -183,13 +184,12 @@ static struct se_device *fd_create_virtdevice(
* one (1) logical sector from underlying struct block_device
*/
fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev);
fd_dev->fd_dev_size = (i_size_read(file->f_mapping->host) -
dev_size = (i_size_read(file->f_mapping->host) -
fd_dev->fd_block_size);
pr_debug("FILEIO: Using size: %llu bytes from struct"
" block_device blocks: %llu logical_block_size: %d\n",
fd_dev->fd_dev_size,
div_u64(fd_dev->fd_dev_size, fd_dev->fd_block_size),
dev_size, div_u64(dev_size, fd_dev->fd_block_size),
fd_dev->fd_block_size);
} else {
if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
@ -605,10 +605,20 @@ static u32 fd_get_device_type(struct se_device *dev)
static sector_t fd_get_blocks(struct se_device *dev)
{
struct fd_dev *fd_dev = dev->dev_ptr;
unsigned long long blocks_long = div_u64(fd_dev->fd_dev_size,
dev->se_sub_dev->se_dev_attrib.block_size);
struct file *f = fd_dev->fd_file;
struct inode *i = f->f_mapping->host;
unsigned long long dev_size;
/*
* When using a file that references an underlying struct block_device,
* ensure dev_size is always based on the current inode size in order
* to handle underlying block_device resize operations.
*/
if (S_ISBLK(i->i_mode))
dev_size = (i_size_read(i) - fd_dev->fd_block_size);
else
dev_size = fd_dev->fd_dev_size;
return blocks_long;
return div_u64(dev_size, dev->se_sub_dev->se_dev_attrib.block_size);
}
static struct se_subsystem_api fileio_template = {