From abf5439370491dd6fbb4fe1a7939680d2a9bc9d4 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Sat, 16 Aug 2008 14:10:05 +0900 Subject: block: move cmdfilter from gendisk to request_queue cmd_filter works only for the block layer SG_IO with SCSI block devices. It breaks scsi/sg.c, bsg, and the block layer SG_IO with SCSI character devices (such as st). We hit a kernel crash with them. The problem is that cmd_filter code accesses to gendisk (having struct blk_scsi_cmd_filter) via inode->i_bdev->bd_disk. It works for only SCSI block device files. With character device files, inode->i_bdev leads you to struct cdev. inode->i_bdev->bd_disk->blk_scsi_cmd_filter isn't safe. SCSI ULDs don't expose gendisk; they keep it private. bsg needs to be independent on any protocols. We shouldn't change ULDs to expose their gendisk. This patch moves struct blk_scsi_cmd_filter from gendisk to request_queue, a common object, which eveyone can access to. The user interface doesn't change; users can change the filters via /sys/block/. gendisk has a pointer to request_queue so the cmd_filter code accesses to struct blk_scsi_cmd_filter. Signed-off-by: FUJITA Tomonori Signed-off-by: Jens Axboe --- block/cmd-filter.c | 118 +++-------------------------------------------------- 1 file changed, 6 insertions(+), 112 deletions(-) (limited to 'block/cmd-filter.c') diff --git a/block/cmd-filter.c b/block/cmd-filter.c index eec4404fd357..c705c33361a0 100644 --- a/block/cmd-filter.c +++ b/block/cmd-filter.c @@ -27,8 +27,8 @@ #include #include -int blk_cmd_filter_verify_command(struct blk_scsi_cmd_filter *filter, - unsigned char *cmd, mode_t *f_mode) +int blk_verify_command(struct blk_scsi_cmd_filter *filter, + unsigned char *cmd, int has_write_perm) { /* root can do any command. */ if (capable(CAP_SYS_RAWIO)) @@ -43,30 +43,11 @@ int blk_cmd_filter_verify_command(struct blk_scsi_cmd_filter *filter, return 0; /* Write-safe commands require a writable open */ - if (test_bit(cmd[0], filter->write_ok) && (*f_mode & FMODE_WRITE)) + if (test_bit(cmd[0], filter->write_ok) && has_write_perm) return 0; return -EPERM; } -EXPORT_SYMBOL(blk_cmd_filter_verify_command); - -int blk_verify_command(struct file *file, unsigned char *cmd) -{ - struct gendisk *disk; - struct inode *inode; - - if (!file) - return -EINVAL; - - inode = file->f_dentry->d_inode; - if (!inode) - return -EINVAL; - - disk = inode->i_bdev->bd_disk; - - return blk_cmd_filter_verify_command(&disk->cmd_filter, - cmd, &file->f_mode); -} EXPORT_SYMBOL(blk_verify_command); /* and now, the sysfs stuff */ @@ -219,114 +200,27 @@ static struct kobj_type rcf_ktype = { .default_attrs = default_attrs, }; -#ifndef MAINTENANCE_IN_CMD -#define MAINTENANCE_IN_CMD 0xa3 -#endif - -static void rcf_set_defaults(struct blk_scsi_cmd_filter *filter) -{ - /* Basic read-only commands */ - __set_bit(TEST_UNIT_READY, filter->read_ok); - __set_bit(REQUEST_SENSE, filter->read_ok); - __set_bit(READ_6, filter->read_ok); - __set_bit(READ_10, filter->read_ok); - __set_bit(READ_12, filter->read_ok); - __set_bit(READ_16, filter->read_ok); - __set_bit(READ_BUFFER, filter->read_ok); - __set_bit(READ_DEFECT_DATA, filter->read_ok); - __set_bit(READ_CAPACITY, filter->read_ok); - __set_bit(READ_LONG, filter->read_ok); - __set_bit(INQUIRY, filter->read_ok); - __set_bit(MODE_SENSE, filter->read_ok); - __set_bit(MODE_SENSE_10, filter->read_ok); - __set_bit(LOG_SENSE, filter->read_ok); - __set_bit(START_STOP, filter->read_ok); - __set_bit(GPCMD_VERIFY_10, filter->read_ok); - __set_bit(VERIFY_16, filter->read_ok); - __set_bit(REPORT_LUNS, filter->read_ok); - __set_bit(SERVICE_ACTION_IN, filter->read_ok); - __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok); - __set_bit(MAINTENANCE_IN_CMD, filter->read_ok); - __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok); - - /* Audio CD commands */ - __set_bit(GPCMD_PLAY_CD, filter->read_ok); - __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok); - __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok); - __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok); - __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok); - - /* CD/DVD data reading */ - __set_bit(GPCMD_READ_CD, filter->read_ok); - __set_bit(GPCMD_READ_CD_MSF, filter->read_ok); - __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok); - __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok); - __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok); - __set_bit(GPCMD_READ_HEADER, filter->read_ok); - __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok); - __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok); - __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok); - __set_bit(GPCMD_REPORT_KEY, filter->read_ok); - __set_bit(GPCMD_SCAN, filter->read_ok); - __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok); - __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok); - __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok); - __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok); - __set_bit(GPCMD_SEEK, filter->read_ok); - __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok); - - /* Basic writing commands */ - __set_bit(WRITE_6, filter->write_ok); - __set_bit(WRITE_10, filter->write_ok); - __set_bit(WRITE_VERIFY, filter->write_ok); - __set_bit(WRITE_12, filter->write_ok); - __set_bit(WRITE_VERIFY_12, filter->write_ok); - __set_bit(WRITE_16, filter->write_ok); - __set_bit(WRITE_LONG, filter->write_ok); - __set_bit(WRITE_LONG_2, filter->write_ok); - __set_bit(ERASE, filter->write_ok); - __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok); - __set_bit(MODE_SELECT, filter->write_ok); - __set_bit(LOG_SELECT, filter->write_ok); - __set_bit(GPCMD_BLANK, filter->write_ok); - __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok); - __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok); - __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok); - __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok); - __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok); - __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok); - __set_bit(GPCMD_SEND_EVENT, filter->write_ok); - __set_bit(GPCMD_SEND_KEY, filter->write_ok); - __set_bit(GPCMD_SEND_OPC, filter->write_ok); - __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok); - __set_bit(GPCMD_SET_SPEED, filter->write_ok); - __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok); - __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok); - __set_bit(GPCMD_SET_STREAMING, filter->write_ok); -} - int blk_register_filter(struct gendisk *disk) { int ret; - struct blk_scsi_cmd_filter *filter = &disk->cmd_filter; + struct blk_scsi_cmd_filter *filter = &disk->queue->cmd_filter; struct kobject *parent = kobject_get(disk->holder_dir->parent); if (!parent) return -ENODEV; ret = kobject_init_and_add(&filter->kobj, &rcf_ktype, parent, - "%s", "cmd_filter"); + "%s", "cmd_filter"); if (ret < 0) return ret; - rcf_set_defaults(filter); return 0; } void blk_unregister_filter(struct gendisk *disk) { - struct blk_scsi_cmd_filter *filter = &disk->cmd_filter; + struct blk_scsi_cmd_filter *filter = &disk->queue->cmd_filter; kobject_put(&filter->kobj); kobject_put(disk->holder_dir->parent); -- cgit v1.2.3