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 --- include/linux/blkdev.h | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index e61f22be4d0..d2d34e2774b 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -280,6 +280,15 @@ struct blk_queue_tag { atomic_t refcnt; /* map can be shared */ }; +#define BLK_SCSI_MAX_CMDS (256) +#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) + +struct blk_scsi_cmd_filter { + unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; + unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; + struct kobject kobj; +}; + struct request_queue { /* @@ -398,6 +407,7 @@ struct request_queue #if defined(CONFIG_BLK_DEV_BSG) struct bsg_class_device bsg_dev; #endif + struct blk_scsi_cmd_filter cmd_filter; }; #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ @@ -833,11 +843,11 @@ extern int blkdev_issue_flush(struct block_device *, sector_t *); /* * command filter functions */ -extern int blk_verify_command(struct file *file, unsigned char *cmd); -extern int blk_cmd_filter_verify_command(struct blk_scsi_cmd_filter *filter, - unsigned char *cmd, mode_t *f_mode); +extern int blk_verify_command(struct blk_scsi_cmd_filter *filter, + unsigned char *cmd, int has_write_perm); extern int blk_register_filter(struct gendisk *disk); extern void blk_unregister_filter(struct gendisk *disk); +extern void blk_set_cmd_filter_defaults(struct blk_scsi_cmd_filter *filter); #define MAX_PHYS_SEGMENTS 128 #define MAX_HW_SEGMENTS 128 -- cgit v1.2.3-70-g09d2 From 4beab5c623fef4622f9a8593f85760ff10b5a3f7 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Sat, 26 Jul 2008 18:03:25 +0900 Subject: block: rename blk_scsi_cmd_filter to blk_cmd_filter Technically, the cmd_filter would be applied to other protocols though it's unlikely to happen. Putting SCSI stuff to request_queue is kinda layer violation. So let's rename it. Signed-off-by: FUJITA Tomonori Signed-off-by: Jens Axboe --- block/cmd-filter.c | 30 +++++++++++++++--------------- block/scsi_ioctl.c | 2 +- include/linux/blkdev.h | 8 ++++---- 3 files changed, 20 insertions(+), 20 deletions(-) (limited to 'include/linux/blkdev.h') diff --git a/block/cmd-filter.c b/block/cmd-filter.c index c705c33361a..0e3a123944a 100644 --- a/block/cmd-filter.c +++ b/block/cmd-filter.c @@ -27,7 +27,7 @@ #include #include -int blk_verify_command(struct blk_scsi_cmd_filter *filter, +int blk_verify_command(struct blk_cmd_filter *filter, unsigned char *cmd, int has_write_perm) { /* root can do any command. */ @@ -51,7 +51,7 @@ int blk_verify_command(struct blk_scsi_cmd_filter *filter, EXPORT_SYMBOL(blk_verify_command); /* and now, the sysfs stuff */ -static ssize_t rcf_cmds_show(struct blk_scsi_cmd_filter *filter, char *page, +static ssize_t rcf_cmds_show(struct blk_cmd_filter *filter, char *page, int rw) { char *npage = page; @@ -78,18 +78,18 @@ static ssize_t rcf_cmds_show(struct blk_scsi_cmd_filter *filter, char *page, return npage - page; } -static ssize_t rcf_readcmds_show(struct blk_scsi_cmd_filter *filter, char *page) +static ssize_t rcf_readcmds_show(struct blk_cmd_filter *filter, char *page) { return rcf_cmds_show(filter, page, READ); } -static ssize_t rcf_writecmds_show(struct blk_scsi_cmd_filter *filter, +static ssize_t rcf_writecmds_show(struct blk_cmd_filter *filter, char *page) { return rcf_cmds_show(filter, page, WRITE); } -static ssize_t rcf_cmds_store(struct blk_scsi_cmd_filter *filter, +static ssize_t rcf_cmds_store(struct blk_cmd_filter *filter, const char *page, size_t count, int rw) { ssize_t ret = 0; @@ -122,13 +122,13 @@ static ssize_t rcf_cmds_store(struct blk_scsi_cmd_filter *filter, return count; } -static ssize_t rcf_readcmds_store(struct blk_scsi_cmd_filter *filter, +static ssize_t rcf_readcmds_store(struct blk_cmd_filter *filter, const char *page, size_t count) { return rcf_cmds_store(filter, page, count, READ); } -static ssize_t rcf_writecmds_store(struct blk_scsi_cmd_filter *filter, +static ssize_t rcf_writecmds_store(struct blk_cmd_filter *filter, const char *page, size_t count) { return rcf_cmds_store(filter, page, count, WRITE); @@ -136,8 +136,8 @@ static ssize_t rcf_writecmds_store(struct blk_scsi_cmd_filter *filter, struct rcf_sysfs_entry { struct attribute attr; - ssize_t (*show)(struct blk_scsi_cmd_filter *, char *); - ssize_t (*store)(struct blk_scsi_cmd_filter *, const char *, size_t); + ssize_t (*show)(struct blk_cmd_filter *, char *); + ssize_t (*store)(struct blk_cmd_filter *, const char *, size_t); }; static struct rcf_sysfs_entry rcf_readcmds_entry = { @@ -164,9 +164,9 @@ static ssize_t rcf_attr_show(struct kobject *kobj, struct attribute *attr, char *page) { struct rcf_sysfs_entry *entry = to_rcf(attr); - struct blk_scsi_cmd_filter *filter; + struct blk_cmd_filter *filter; - filter = container_of(kobj, struct blk_scsi_cmd_filter, kobj); + filter = container_of(kobj, struct blk_cmd_filter, kobj); if (entry->show) return entry->show(filter, page); @@ -178,7 +178,7 @@ rcf_attr_store(struct kobject *kobj, struct attribute *attr, const char *page, size_t length) { struct rcf_sysfs_entry *entry = to_rcf(attr); - struct blk_scsi_cmd_filter *filter; + struct blk_cmd_filter *filter; if (!capable(CAP_SYS_RAWIO)) return -EPERM; @@ -186,7 +186,7 @@ rcf_attr_store(struct kobject *kobj, struct attribute *attr, if (!entry->store) return -EINVAL; - filter = container_of(kobj, struct blk_scsi_cmd_filter, kobj); + filter = container_of(kobj, struct blk_cmd_filter, kobj); return entry->store(filter, page, length); } @@ -203,7 +203,7 @@ static struct kobj_type rcf_ktype = { int blk_register_filter(struct gendisk *disk) { int ret; - struct blk_scsi_cmd_filter *filter = &disk->queue->cmd_filter; + struct blk_cmd_filter *filter = &disk->queue->cmd_filter; struct kobject *parent = kobject_get(disk->holder_dir->parent); if (!parent) @@ -220,7 +220,7 @@ int blk_register_filter(struct gendisk *disk) void blk_unregister_filter(struct gendisk *disk) { - struct blk_scsi_cmd_filter *filter = &disk->queue->cmd_filter; + struct blk_cmd_filter *filter = &disk->queue->cmd_filter; kobject_put(&filter->kobj); kobject_put(disk->holder_dir->parent); diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c index d01ef5ee427..ec4b7f23462 100644 --- a/block/scsi_ioctl.c +++ b/block/scsi_ioctl.c @@ -105,7 +105,7 @@ static int sg_emulated_host(struct request_queue *q, int __user *p) return put_user(1, p); } -void blk_set_cmd_filter_defaults(struct blk_scsi_cmd_filter *filter) +void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter) { /* Basic read-only commands */ __set_bit(TEST_UNIT_READY, filter->read_ok); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index d2d34e2774b..ab247d589ad 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -283,7 +283,7 @@ struct blk_queue_tag { #define BLK_SCSI_MAX_CMDS (256) #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) -struct blk_scsi_cmd_filter { +struct blk_cmd_filter { unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; struct kobject kobj; @@ -407,7 +407,7 @@ struct request_queue #if defined(CONFIG_BLK_DEV_BSG) struct bsg_class_device bsg_dev; #endif - struct blk_scsi_cmd_filter cmd_filter; + struct blk_cmd_filter cmd_filter; }; #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ @@ -843,11 +843,11 @@ extern int blkdev_issue_flush(struct block_device *, sector_t *); /* * command filter functions */ -extern int blk_verify_command(struct blk_scsi_cmd_filter *filter, +extern int blk_verify_command(struct blk_cmd_filter *filter, unsigned char *cmd, int has_write_perm); extern int blk_register_filter(struct gendisk *disk); extern void blk_unregister_filter(struct gendisk *disk); -extern void blk_set_cmd_filter_defaults(struct blk_scsi_cmd_filter *filter); +extern void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter); #define MAX_PHYS_SEGMENTS 128 #define MAX_HW_SEGMENTS 128 -- cgit v1.2.3-70-g09d2 From 5168c47b4c294412f079dd3cc891e0276bb0479e Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 26 Aug 2008 09:03:17 +0200 Subject: block: remove blk_queue_tag_depth() and blk_queue_tag_queue() They are unused and ->busy doesn't exist anymore. Signed-off-by: Jens Axboe --- include/linux/blkdev.h | 2 -- 1 file changed, 2 deletions(-) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index ab247d589ad..44710d7e7bf 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -817,8 +817,6 @@ extern void blk_put_queue(struct request_queue *); /* * tag stuff */ -#define blk_queue_tag_depth(q) ((q)->queue_tags->busy) -#define blk_queue_tag_queue(q) ((q)->queue_tags->busy < (q)->queue_tags->max_depth) #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) extern int blk_queue_start_tag(struct request_queue *, struct request *); extern struct request *blk_queue_find_tag(struct request_queue *, int); -- cgit v1.2.3-70-g09d2