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author | 2012-12-05 13:09:45 -0800 | |
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committer | 2012-12-05 13:09:45 -0800 | |
commit | 778229af95977a4aca8656143d457401c2bb8f96 (patch) | |
tree | 7b739fabd330d5ac59150d43325a9b719d5630ec /drivers/target/target_core_file.c | |
parent | target/file: Fix 32-bit highmem breakage for SGL -> iovec mapping (diff) | |
download | linux-778229af95977a4aca8656143d457401c2bb8f96.tar.gz linux-778229af95977a4aca8656143d457401c2bb8f96.tar.bz2 linux-778229af95977a4aca8656143d457401c2bb8f96.zip |
target/file: merge fd_do_readv() and fd_do_writev()
Those two functions are almost identical so merge them. Noticed this
while fixing the highmem in both cases.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_file.c')
-rw-r--r-- | drivers/target/target_core_file.c | 92 |
1 files changed, 32 insertions, 60 deletions
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c index 1fc5825b3912..b9c88497e8f0 100644 --- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -216,8 +216,8 @@ static void fd_free_device(struct se_device *dev) kfree(fd_dev); } -static int fd_do_readv(struct se_cmd *cmd, struct scatterlist *sgl, - u32 sgl_nents) +static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl, + u32 sgl_nents, int is_write) { struct se_device *se_dev = cmd->se_dev; struct fd_dev *dev = FD_DEV(se_dev); @@ -241,73 +241,45 @@ static int fd_do_readv(struct se_cmd *cmd, struct scatterlist *sgl, old_fs = get_fs(); set_fs(get_ds()); - ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); + + if (is_write) + ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); + else + ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); + set_fs(old_fs); for_each_sg(sgl, sg, sgl_nents, i) kunmap(sg_page(sg)); + kfree(iov); - /* - * Return zeros and GOOD status even if the READ did not return - * the expected virt_size for struct file w/o a backing struct - * block_device. - */ - if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { + + if (is_write) { if (ret < 0 || ret != cmd->data_length) { - pr_err("vfs_readv() returned %d," - " expecting %d for S_ISBLK\n", ret, - (int)cmd->data_length); + pr_err("%s() write returned %d\n", __func__, ret); return (ret < 0 ? ret : -EINVAL); } } else { - if (ret < 0) { - pr_err("vfs_readv() returned %d for non" - " S_ISBLK\n", ret); - return ret; + /* + * Return zeros and GOOD status even if the READ did not return + * the expected virt_size for struct file w/o a backing struct + * block_device. + */ + if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { + if (ret < 0 || ret != cmd->data_length) { + pr_err("%s() returned %d, expecting %u for " + "S_ISBLK\n", __func__, ret, + cmd->data_length); + return (ret < 0 ? ret : -EINVAL); + } + } else { + if (ret < 0) { + pr_err("%s() returned %d for non S_ISBLK\n", + __func__, ret); + return ret; + } } } - - return 1; -} - -static int fd_do_writev(struct se_cmd *cmd, struct scatterlist *sgl, - u32 sgl_nents) -{ - struct se_device *se_dev = cmd->se_dev; - struct fd_dev *dev = FD_DEV(se_dev); - struct file *fd = dev->fd_file; - struct scatterlist *sg; - struct iovec *iov; - mm_segment_t old_fs; - loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size); - int ret, i = 0; - - iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); - if (!iov) { - pr_err("Unable to allocate fd_do_writev iov[]\n"); - return -ENOMEM; - } - - for_each_sg(sgl, sg, sgl_nents, i) { - iov[i].iov_len = sg->length; - iov[i].iov_base = kmap(sg_page(sg)) + sg->offset; - } - - old_fs = get_fs(); - set_fs(get_ds()); - ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); - set_fs(old_fs); - - for_each_sg(sgl, sg, sgl_nents, i) - kunmap(sg_page(sg)); - - kfree(iov); - - if (ret < 0 || ret != cmd->data_length) { - pr_err("vfs_writev() returned %d\n", ret); - return (ret < 0 ? ret : -EINVAL); - } - return 1; } @@ -370,9 +342,9 @@ fd_execute_rw(struct se_cmd *cmd) * physical memory addresses to struct iovec virtual memory. */ if (data_direction == DMA_FROM_DEVICE) { - ret = fd_do_readv(cmd, sgl, sgl_nents); + ret = fd_do_rw(cmd, sgl, sgl_nents, 0); } else { - ret = fd_do_writev(cmd, sgl, sgl_nents); + ret = fd_do_rw(cmd, sgl, sgl_nents, 1); /* * Perform implict vfs_fsync_range() for fd_do_writev() ops * for SCSI WRITEs with Forced Unit Access (FUA) set. |