diff options
| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-05-16 16:05:26 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-05-17 12:02:43 -0700 |
| commit | cd9323fd68aee3c1c6b5b21e5746c9d1b586fb58 (patch) | |
| tree | a1e5045e68a8a081a2e932846a0bf951128d93db | |
| parent | edc318d9fea6854df752ec8c645b960b0d5a1d23 (diff) | |
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>
| -rw-r--r-- | drivers/target/target_core_file.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c index 7ed58e2df79..f286955331a 100644 --- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -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 = { |