target/file: walk properly over sg list
This patch changes fileio to use for_each_sg() when walking se_task->task_sg memory passed into from loopback LLD struct scsi_cmnd scatterlist memory. This addresses an issue where FILEIO backends with loopback where hitting the following OOPs with mkfs.ext2: |kernel BUG at include/linux/scatterlist.h:97! |invalid opcode: 0000 [#1] PREEMPT SMP |Modules linked in: sd_mod tcm_loop target_core_stgt scsi_tgt target_core_pscsi target_core_file target_core_iblock target_core_mod configfs scsi_mod | |Pid: 671, comm: LIO_fileio Not tainted 3.1.0-rc10+ #139 Bochs Bochs |EIP: 0060:[<e0afd746>] EFLAGS: 00010202 CPU: 0 |EIP is at fd_do_task+0x396/0x420 [target_core_file] | [<e0aa7884>] __transport_execute_tasks+0xd4/0x190 [target_core_mod] | [<e0aa797c>] transport_execute_tasks+0x3c/0xf0 [target_core_mod] |EIP: [<e0afd746>] fd_do_task+0x396/0x420 [target_core_file] SS:ESP 0068:dea47e90 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Christoph Hellwig <hch@lst.de> Cc: stable@kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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@ -289,9 +289,9 @@ static int fd_do_readv(struct se_task *task)
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return -ENOMEM;
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}
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for (i = 0; i < task->task_sg_nents; i++) {
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iov[i].iov_len = sg[i].length;
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iov[i].iov_base = sg_virt(&sg[i]);
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for_each_sg(task->task_sg, sg, task->task_sg_nents, i) {
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iov[i].iov_len = sg->length;
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iov[i].iov_base = sg_virt(sg);
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}
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old_fs = get_fs();
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@ -342,9 +342,9 @@ static int fd_do_writev(struct se_task *task)
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return -ENOMEM;
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}
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for (i = 0; i < task->task_sg_nents; i++) {
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iov[i].iov_len = sg[i].length;
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iov[i].iov_base = sg_virt(&sg[i]);
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for_each_sg(task->task_sg, sg, task->task_sg_nents, i) {
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iov[i].iov_len = sg->length;
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iov[i].iov_base = sg_virt(sg);
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}
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old_fs = get_fs();
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