From c64e38ea17a81721da0393584fd807f8434050fa Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Mon, 1 Nov 2010 14:32:27 -0400 Subject: xen/blkfront: map REQ_FLUSH into a full barrier Implement a flush as a full barrier, since we have nothing weaker. Signed-off-by: Jeremy Fitzhardinge Acked-by: Christoph Hellwig --- drivers/block/xen-blkfront.c | 19 +++++-------------- 1 file changed, 5 insertions(+), 14 deletions(-) (limited to 'drivers/block') diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 06e2812ba124..3a318d8576c5 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -245,14 +245,11 @@ static int blkif_ioctl(struct block_device *bdev, fmode_t mode, } /* - * blkif_queue_request + * Generate a Xen blkfront IO request from a blk layer request. Reads + * and writes are handled as expected. Since we lack a loose flush + * request, we map flushes into a full ordered barrier. * - * request block io - * - * id: for guest use only. - * operation: BLKIF_OP_{READ,WRITE,PROBE} - * buffer: buffer to read/write into. this should be a - * virtual address in the guest os. + * @req: a request struct */ static int blkif_queue_request(struct request *req) { @@ -289,7 +286,7 @@ static int blkif_queue_request(struct request *req) ring_req->operation = rq_data_dir(req) ? BLKIF_OP_WRITE : BLKIF_OP_READ; - if (req->cmd_flags & REQ_HARDBARRIER) + if (req->cmd_flags & REQ_FLUSH) ring_req->operation = BLKIF_OP_WRITE_BARRIER; ring_req->nr_segments = blk_rq_map_sg(req->q, req, info->sg); @@ -1069,14 +1066,8 @@ static void blkfront_connect(struct blkfront_info *info) */ info->feature_flush = 0; - /* - * The driver doesn't properly handled empty flushes, so - * lets disable barrier support for now. - */ -#if 0 if (!err && barrier) info->feature_flush = REQ_FLUSH; -#endif err = xlvbd_alloc_gendisk(sectors, info, binfo, sector_size); if (err) { -- cgit v1.2.1 From a945b9801a9bfd4a98bcfd9f6656b5027b254e3f Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Mon, 1 Nov 2010 17:03:14 -0400 Subject: xen/blkfront: change blk_shadow.request to proper pointer Signed-off-by: Jeremy Fitzhardinge --- drivers/block/xen-blkfront.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) (limited to 'drivers/block') diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 3a318d8576c5..31c8a643d109 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -65,7 +65,7 @@ enum blkif_state { struct blk_shadow { struct blkif_request req; - unsigned long request; + struct request *request; unsigned long frame[BLKIF_MAX_SEGMENTS_PER_REQUEST]; }; @@ -136,7 +136,7 @@ static void add_id_to_freelist(struct blkfront_info *info, unsigned long id) { info->shadow[id].req.id = info->shadow_free; - info->shadow[id].request = 0; + info->shadow[id].request = NULL; info->shadow_free = id; } @@ -278,7 +278,7 @@ static int blkif_queue_request(struct request *req) /* Fill out a communications ring structure. */ ring_req = RING_GET_REQUEST(&info->ring, info->ring.req_prod_pvt); id = get_id_from_freelist(info); - info->shadow[id].request = (unsigned long)req; + info->shadow[id].request = req; ring_req->id = id; ring_req->sector_number = (blkif_sector_t)blk_rq_pos(req); @@ -633,7 +633,7 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id) bret = RING_GET_RESPONSE(&info->ring, i); id = bret->id; - req = (struct request *)info->shadow[id].request; + req = info->shadow[id].request; blkif_completion(&info->shadow[id]); @@ -898,7 +898,7 @@ static int blkif_recover(struct blkfront_info *info) /* Stage 3: Find pending requests and requeue them. */ for (i = 0; i < BLK_RING_SIZE; i++) { /* Not in use? */ - if (copy[i].request == 0) + if (!copy[i].request) continue; /* Grab a request slot and copy shadow state into it. */ @@ -915,9 +915,7 @@ static int blkif_recover(struct blkfront_info *info) req->seg[j].gref, info->xbdev->otherend_id, pfn_to_mfn(info->shadow[req->id].frame[j]), - rq_data_dir( - (struct request *) - info->shadow[req->id].request)); + rq_data_dir(info->shadow[req->id].request)); info->shadow[req->id].req = *req; info->ring.req_prod_pvt++; -- cgit v1.2.1 From be2f8373c188ed1f5d36003c9928e4d695213080 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Tue, 2 Nov 2010 10:38:33 -0400 Subject: xen/blkfront: Implement FUA with BLKIF_OP_WRITE_BARRIER The BLKIF_OP_WRITE_BARRIER is a full ordered barrier, so we can use it to implement FUA as well as a plain FLUSH. Signed-off-by: Jeremy Fitzhardinge Acked-by: Christoph Hellwig --- drivers/block/xen-blkfront.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) (limited to 'drivers/block') diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 31c8a643d109..76b874a79175 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -286,8 +286,18 @@ static int blkif_queue_request(struct request *req) ring_req->operation = rq_data_dir(req) ? BLKIF_OP_WRITE : BLKIF_OP_READ; - if (req->cmd_flags & REQ_FLUSH) + + if (req->cmd_flags & (REQ_FLUSH | REQ_FUA)) { + /* + * Ideally we could just do an unordered + * flush-to-disk, but all we have is a full write + * barrier at the moment. However, a barrier write is + * a superset of FUA, so we can implement it the same + * way. (It's also a FLUSH+FUA, since it is + * guaranteed ordered WRT previous writes.) + */ ring_req->operation = BLKIF_OP_WRITE_BARRIER; + } ring_req->nr_segments = blk_rq_map_sg(req->q, req, info->sg); BUG_ON(ring_req->nr_segments > BLKIF_MAX_SEGMENTS_PER_REQUEST); @@ -1065,7 +1075,7 @@ static void blkfront_connect(struct blkfront_info *info) info->feature_flush = 0; if (!err && barrier) - info->feature_flush = REQ_FLUSH; + info->feature_flush = REQ_FLUSH | REQ_FUA; err = xlvbd_alloc_gendisk(sectors, info, binfo, sector_size); if (err) { -- cgit v1.2.1 From dcb8baeceaa1c629bbd06f472cea023ad08a0c33 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Tue, 2 Nov 2010 11:55:58 -0400 Subject: xen/blkfront: cope with backend that fail empty BLKIF_OP_WRITE_BARRIER requests Some(?) Xen block backends fail BLKIF_OP_WRITE_BARRIER requests, which Linux uses as a cache flush operation. In that case, disable use of FLUSH. Signed-off-by: Jeremy Fitzhardinge Cc: Daniel Stodden --- drivers/block/xen-blkfront.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/block') diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 76b874a79175..4f9e22f29138 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -656,6 +656,16 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id) printk(KERN_WARNING "blkfront: %s: write barrier op failed\n", info->gd->disk_name); error = -EOPNOTSUPP; + } + if (unlikely(bret->status == BLKIF_RSP_ERROR && + info->shadow[id].req.nr_segments == 0)) { + printk(KERN_WARNING "blkfront: %s: empty write barrier op failed\n", + info->gd->disk_name); + error = -EOPNOTSUPP; + } + if (unlikely(error)) { + if (error == -EOPNOTSUPP) + error = 0; info->feature_flush = 0; xlvbd_flush(info); } -- cgit v1.2.1 From 3e9bb2a071614f1d185740f31ac503ecba11d783 Mon Sep 17 00:00:00 2001 From: Vivek Goyal Date: Mon, 15 Nov 2010 19:32:43 +0100 Subject: block: fix amiga and atari floppy driver compile warning MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Geert, my crosstool don't produce warning below. I guess this has to do something with compiler version. - Geert noticed following warning during compilation. drivers/block/amiflop.c:1344: warning: ‘rq’ may be used uninitialized in this function drivers/block/ataflop.c:1402: warning: ‘rq’ may be used uninitialized in this function - Initialize rq to NULL to fix the warning. If we can't find a suitable request to dispatch, this function should return NULL instead of a possibly garbage pointer. - Cross compile tested only. Don't have hardware to test it. Reported-by: Geert Uytterhoeven Signed-off-by: Vivek Goyal Signed-off-by: Jens Axboe --- drivers/block/amiflop.c | 2 +- drivers/block/ataflop.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/block') diff --git a/drivers/block/amiflop.c b/drivers/block/amiflop.c index a1725e6488d3..7888501ad9ee 100644 --- a/drivers/block/amiflop.c +++ b/drivers/block/amiflop.c @@ -1341,7 +1341,7 @@ static struct request *set_next_request(void) { struct request_queue *q; int cnt = FD_MAX_UNITS; - struct request *rq; + struct request *rq = NULL; /* Find next queue we can dispatch from */ fdc_queue = fdc_queue + 1; diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c index 4e4cc6c828cb..605a67e40bbf 100644 --- a/drivers/block/ataflop.c +++ b/drivers/block/ataflop.c @@ -1399,7 +1399,7 @@ static struct request *set_next_request(void) { struct request_queue *q; int old_pos = fdc_queue; - struct request *rq; + struct request *rq = NULL; do { q = unit[fdc_queue].disk->queue; -- cgit v1.2.1 From bbe425cd9ae83eacd0c9f09df2bf56dc911a54cd Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Wed, 17 Nov 2010 11:56:13 +0100 Subject: cciss: fix build for PROC_FS disabled The recent patch to fix the removal of a non-existing proc directory introduced this build problem for !CONFIG_PROC_FS: drivers/block/cciss.c:4929: error: 'proc_cciss' undeclared (first use in this function) Fix it by moving proc_cciss outside of the CONFIG_PROC_FS scope. Reported-by: Randy Dunlap Signed-off-by: Jens Axboe --- drivers/block/cciss.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'drivers/block') diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index a67d0a611a8a..f291587d753e 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -66,6 +66,7 @@ MODULE_VERSION("3.6.26"); MODULE_LICENSE("GPL"); static DEFINE_MUTEX(cciss_mutex); +static struct proc_dir_entry *proc_cciss; #include "cciss_cmd.h" #include "cciss.h" @@ -363,8 +364,6 @@ static const char *raid_label[] = { "0", "4", "1(1+0)", "5", "5+1", "ADG", #define ENG_GIG_FACTOR (ENG_GIG/512) #define ENGAGE_SCSI "engage scsi" -static struct proc_dir_entry *proc_cciss; - static void cciss_seq_show_header(struct seq_file *seq) { ctlr_info_t *h = seq->private; -- cgit v1.2.1 From c13f7e1a94007c4381814e7daf033e3e8f0663f3 Mon Sep 17 00:00:00 2001 From: Lars Ellenberg Date: Fri, 29 Oct 2010 23:32:01 +0200 Subject: drbd: don't recvmsg with zero length This should fix a performance degradation we observed recently. If we don't expect any subheader, we should not call into the tcp stack, as that may add considerable latency if there is no data available at this point. For a synthetic synchronous write load with single outstanding writes, this additional latency when processing the "unplug remote" packet added up to a performance degradation factor >= 10. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- drivers/block/drbd/drbd_receiver.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) (limited to 'drivers/block') diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index 89d8a7cc4054..24487d4fb202 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -3627,17 +3627,19 @@ static void drbdd(struct drbd_conf *mdev) } shs = drbd_cmd_handler[cmd].pkt_size - sizeof(union p_header); - rv = drbd_recv(mdev, &header->h80.payload, shs); - if (unlikely(rv != shs)) { - dev_err(DEV, "short read while reading sub header: rv=%d\n", rv); - goto err_out; - } - if (packet_size - shs > 0 && !drbd_cmd_handler[cmd].expect_payload) { dev_err(DEV, "No payload expected %s l:%d\n", cmdname(cmd), packet_size); goto err_out; } + if (shs) { + rv = drbd_recv(mdev, &header->h80.payload, shs); + if (unlikely(rv != shs)) { + dev_err(DEV, "short read while reading sub header: rv=%d\n", rv); + goto err_out; + } + } + rv = drbd_cmd_handler[cmd].function(mdev, cmd, packet_size - shs); if (unlikely(!rv)) { -- cgit v1.2.1 From a115413de13ae6beb0cbfc198afe385a261ab284 Mon Sep 17 00:00:00 2001 From: Lars Ellenberg Date: Sat, 13 Nov 2010 20:42:29 +0100 Subject: drbd: fix for spin_lock_irqsave in endio callback In commit 9b7f76dc37919ea36caa9680a3f765e5b19b25fb, Author: Lars Ellenberg Date: Wed Aug 11 23:40:24 2010 +0200 drbd: new configuration parameter c-min-rate a bad chunk slipped through, which is now reverted as well, restoring the correct irqsave for the endio callback. This patch also add comments at both req_mod() and in the endio callback so it should not happen again. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- drivers/block/drbd/drbd_req.h | 3 ++- drivers/block/drbd/drbd_worker.c | 10 +++++++++- 2 files changed, 11 insertions(+), 2 deletions(-) (limited to 'drivers/block') diff --git a/drivers/block/drbd/drbd_req.h b/drivers/block/drbd/drbd_req.h index 181ea0364822..ab2bd09d54b4 100644 --- a/drivers/block/drbd/drbd_req.h +++ b/drivers/block/drbd/drbd_req.h @@ -339,7 +339,8 @@ static inline int _req_mod(struct drbd_request *req, enum drbd_req_event what) } /* completion of master bio is outside of spinlock. - * If you need it irqsave, do it your self! */ + * If you need it irqsave, do it your self! + * Which means: don't use from bio endio callback. */ static inline int req_mod(struct drbd_request *req, enum drbd_req_event what) { diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c index 47d223c2409c..34f224b018b3 100644 --- a/drivers/block/drbd/drbd_worker.c +++ b/drivers/block/drbd/drbd_worker.c @@ -193,8 +193,10 @@ void drbd_endio_sec(struct bio *bio, int error) */ void drbd_endio_pri(struct bio *bio, int error) { + unsigned long flags; struct drbd_request *req = bio->bi_private; struct drbd_conf *mdev = req->mdev; + struct bio_and_error m; enum drbd_req_event what; int uptodate = bio_flagged(bio, BIO_UPTODATE); @@ -220,7 +222,13 @@ void drbd_endio_pri(struct bio *bio, int error) bio_put(req->private_bio); req->private_bio = ERR_PTR(error); - req_mod(req, what); + /* not req_mod(), we need irqsave here! */ + spin_lock_irqsave(&mdev->req_lock, flags); + __req_mod(req, what, &m); + spin_unlock_irqrestore(&mdev->req_lock, flags); + + if (m.bio) + complete_master_bio(mdev, &m); } int w_read_retry_remote(struct drbd_conf *mdev, struct drbd_work *w, int cancel) -- cgit v1.2.1 From dfc5606dc51381186de765243bab340c8e021868 Mon Sep 17 00:00:00 2001 From: Yehuda Sadeh Date: Fri, 19 Nov 2010 14:51:04 -0800 Subject: rbd: replace the rbd sysfs interface The new interface creates directories per mapped image and under each it creates a subdir per available snapshot. This allows keeping a cleaner interface within the sysfs guidelines. The ABI documentation was updated too. Acked-by: Greg Kroah-Hartman Signed-off-by: Yehuda Sadeh Signed-off-by: Sage Weil --- drivers/block/rbd.c | 748 +++++++++++++++++++++++++++++++++------------------- 1 file changed, 471 insertions(+), 277 deletions(-) (limited to 'drivers/block') diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 6ec9d53806c5..008d4a00b50d 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -21,80 +21,9 @@ - Instructions for use - -------------------- + For usage instructions, please refer to: - 1) Map a Linux block device to an existing rbd image. - - Usage: [snap name] - - $ echo "192.168.0.1 name=admin rbd foo" > /sys/class/rbd/add - - The snapshot name can be "-" or omitted to map the image read/write. - - 2) List all active blkdev<->object mappings. - - In this example, we have performed step #1 twice, creating two blkdevs, - mapped to two separate rados objects in the rados rbd pool - - $ cat /sys/class/rbd/list - #id major client_name pool name snap KB - 0 254 client4143 rbd foo - 1024000 - - The columns, in order, are: - - blkdev unique id - - blkdev assigned major - - rados client id - - rados pool name - - rados block device name - - mapped snapshot ("-" if none) - - device size in KB - - - 3) Create a snapshot. - - Usage: - - $ echo "0 mysnap" > /sys/class/rbd/snap_create - - - 4) Listing a snapshot. - - $ cat /sys/class/rbd/snaps_list - #id snap KB - 0 - 1024000 (*) - 0 foo 1024000 - - The columns, in order, are: - - blkdev unique id - - snapshot name, '-' means none (active read/write version) - - size of device at time of snapshot - - the (*) indicates this is the active version - - 5) Rollback to snapshot. - - Usage: - - $ echo "0 mysnap" > /sys/class/rbd/snap_rollback - - - 6) Mapping an image using snapshot. - - A snapshot mapping is read-only. This is being done by passing - snap= to the options when adding a device. - - $ echo "192.168.0.1 name=admin,snap=mysnap rbd foo" > /sys/class/rbd/add - - - 7) Remove an active blkdev<->rbd image mapping. - - In this example, we remove the mapping with blkdev unique id 1. - - $ echo 1 > /sys/class/rbd/remove - - - NOTE: The actual creation and deletion of rados objects is outside the scope - of this driver. + Documentation/ABI/testing/sysfs-bus-rbd */ @@ -163,6 +92,14 @@ struct rbd_request { u64 len; }; +struct rbd_snap { + struct device dev; + const char *name; + size_t size; + struct list_head node; + u64 id; +}; + /* * a single device */ @@ -193,21 +130,60 @@ struct rbd_device { int read_only; struct list_head node; + + /* list of snapshots */ + struct list_head snaps; + + /* sysfs related */ + struct device dev; +}; + +static struct bus_type rbd_bus_type = { + .name = "rbd", }; static spinlock_t node_lock; /* protects client get/put */ -static struct class *class_rbd; /* /sys/class/rbd */ static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ static LIST_HEAD(rbd_dev_list); /* devices */ static LIST_HEAD(rbd_client_list); /* clients */ +static int __rbd_init_snaps_header(struct rbd_device *rbd_dev); +static void rbd_dev_release(struct device *dev); +static ssize_t rbd_snap_rollback(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t size); +static ssize_t rbd_snap_add(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t count); +static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, + struct rbd_snap *snap);; + + +static struct rbd_device *dev_to_rbd(struct device *dev) +{ + return container_of(dev, struct rbd_device, dev); +} + +static struct device *rbd_get_dev(struct rbd_device *rbd_dev) +{ + return get_device(&rbd_dev->dev); +} + +static void rbd_put_dev(struct rbd_device *rbd_dev) +{ + put_device(&rbd_dev->dev); +} static int rbd_open(struct block_device *bdev, fmode_t mode) { struct gendisk *disk = bdev->bd_disk; struct rbd_device *rbd_dev = disk->private_data; + rbd_get_dev(rbd_dev); + set_device_ro(bdev, rbd_dev->read_only); if ((mode & FMODE_WRITE) && rbd_dev->read_only) @@ -216,9 +192,19 @@ static int rbd_open(struct block_device *bdev, fmode_t mode) return 0; } +static int rbd_release(struct gendisk *disk, fmode_t mode) +{ + struct rbd_device *rbd_dev = disk->private_data; + + rbd_put_dev(rbd_dev); + + return 0; +} + static const struct block_device_operations rbd_bd_ops = { .owner = THIS_MODULE, .open = rbd_open, + .release = rbd_release, }; /* @@ -361,7 +347,6 @@ static int rbd_header_from_disk(struct rbd_image_header *header, int ret = -ENOMEM; init_rwsem(&header->snap_rwsem); - header->snap_names_len = le64_to_cpu(ondisk->snap_names_len); header->snapc = kmalloc(sizeof(struct ceph_snap_context) + snap_count * @@ -1256,10 +1241,20 @@ bad: return -ERANGE; } +static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) +{ + struct rbd_snap *snap; + + while (!list_empty(&rbd_dev->snaps)) { + snap = list_first_entry(&rbd_dev->snaps, struct rbd_snap, node); + __rbd_remove_snap_dev(rbd_dev, snap); + } +} + /* * only read the first part of the ondisk header, without the snaps info */ -static int rbd_update_snaps(struct rbd_device *rbd_dev) +static int __rbd_update_snaps(struct rbd_device *rbd_dev) { int ret; struct rbd_image_header h; @@ -1280,12 +1275,15 @@ static int rbd_update_snaps(struct rbd_device *rbd_dev) rbd_dev->header.total_snaps = h.total_snaps; rbd_dev->header.snapc = h.snapc; rbd_dev->header.snap_names = h.snap_names; + rbd_dev->header.snap_names_len = h.snap_names_len; rbd_dev->header.snap_sizes = h.snap_sizes; rbd_dev->header.snapc->seq = snap_seq; + ret = __rbd_init_snaps_header(rbd_dev); + up_write(&rbd_dev->header.snap_rwsem); - return 0; + return ret; } static int rbd_init_disk(struct rbd_device *rbd_dev) @@ -1300,6 +1298,11 @@ static int rbd_init_disk(struct rbd_device *rbd_dev) if (rc) return rc; + /* no need to lock here, as rbd_dev is not registered yet */ + rc = __rbd_init_snaps_header(rbd_dev); + if (rc) + return rc; + rc = rbd_header_set_snap(rbd_dev, rbd_dev->snap_name, &total_size); if (rc) return rc; @@ -1343,54 +1346,360 @@ out: return rc; } -/******************************************************************** - * /sys/class/rbd/ - * add map rados objects to blkdev - * remove unmap rados objects - * list show mappings - *******************************************************************/ +/* + sysfs +*/ + +static ssize_t rbd_size_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct rbd_device *rbd_dev = dev_to_rbd(dev); + + return sprintf(buf, "%llu\n", (unsigned long long)rbd_dev->header.image_size); +} + +static ssize_t rbd_major_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct rbd_device *rbd_dev = dev_to_rbd(dev); -static void class_rbd_release(struct class *cls) + return sprintf(buf, "%d\n", rbd_dev->major); +} + +static ssize_t rbd_client_id_show(struct device *dev, + struct device_attribute *attr, char *buf) { - kfree(cls); + struct rbd_device *rbd_dev = dev_to_rbd(dev); + + return sprintf(buf, "client%lld\n", ceph_client_id(rbd_dev->client)); } -static ssize_t class_rbd_list(struct class *c, - struct class_attribute *attr, - char *data) +static ssize_t rbd_pool_show(struct device *dev, + struct device_attribute *attr, char *buf) { - int n = 0; - struct list_head *tmp; - int max = PAGE_SIZE; + struct rbd_device *rbd_dev = dev_to_rbd(dev); + + return sprintf(buf, "%s\n", rbd_dev->pool_name); +} + +static ssize_t rbd_name_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct rbd_device *rbd_dev = dev_to_rbd(dev); + + return sprintf(buf, "%s\n", rbd_dev->obj); +} + +static ssize_t rbd_snap_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct rbd_device *rbd_dev = dev_to_rbd(dev); + + return sprintf(buf, "%s\n", rbd_dev->snap_name); +} + +static ssize_t rbd_image_refresh(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t size) +{ + struct rbd_device *rbd_dev = dev_to_rbd(dev); + int rc; + int ret = size; mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); - n += snprintf(data, max, - "#id\tmajor\tclient_name\tpool\tname\tsnap\tKB\n"); + rc = __rbd_update_snaps(rbd_dev); + if (rc < 0) + ret = rc; - list_for_each(tmp, &rbd_dev_list) { - struct rbd_device *rbd_dev; + mutex_unlock(&ctl_mutex); + return ret; +} - rbd_dev = list_entry(tmp, struct rbd_device, node); - n += snprintf(data+n, max-n, - "%d\t%d\tclient%lld\t%s\t%s\t%s\t%lld\n", - rbd_dev->id, - rbd_dev->major, - ceph_client_id(rbd_dev->client), - rbd_dev->pool_name, - rbd_dev->obj, rbd_dev->snap_name, - rbd_dev->header.image_size >> 10); - if (n == max) +static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); +static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); +static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); +static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); +static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); +static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); +static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); +static DEVICE_ATTR(create_snap, S_IWUSR, NULL, rbd_snap_add); +static DEVICE_ATTR(rollback_snap, S_IWUSR, NULL, rbd_snap_rollback); + +static struct attribute *rbd_attrs[] = { + &dev_attr_size.attr, + &dev_attr_major.attr, + &dev_attr_client_id.attr, + &dev_attr_pool.attr, + &dev_attr_name.attr, + &dev_attr_current_snap.attr, + &dev_attr_refresh.attr, + &dev_attr_create_snap.attr, + &dev_attr_rollback_snap.attr, + NULL +}; + +static struct attribute_group rbd_attr_group = { + .attrs = rbd_attrs, +}; + +static const struct attribute_group *rbd_attr_groups[] = { + &rbd_attr_group, + NULL +}; + +static void rbd_sysfs_dev_release(struct device *dev) +{ +} + +static struct device_type rbd_device_type = { + .name = "rbd", + .groups = rbd_attr_groups, + .release = rbd_sysfs_dev_release, +}; + + +/* + sysfs - snapshots +*/ + +static ssize_t rbd_snap_size_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); + + return sprintf(buf, "%lld\n", (long long)snap->size); +} + +static ssize_t rbd_snap_id_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); + + return sprintf(buf, "%lld\n", (long long)snap->id); +} + +static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); +static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); + +static struct attribute *rbd_snap_attrs[] = { + &dev_attr_snap_size.attr, + &dev_attr_snap_id.attr, + NULL, +}; + +static struct attribute_group rbd_snap_attr_group = { + .attrs = rbd_snap_attrs, +}; + +static void rbd_snap_dev_release(struct device *dev) +{ + struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); + kfree(snap->name); + kfree(snap); +} + +static const struct attribute_group *rbd_snap_attr_groups[] = { + &rbd_snap_attr_group, + NULL +}; + +static struct device_type rbd_snap_device_type = { + .groups = rbd_snap_attr_groups, + .release = rbd_snap_dev_release, +}; + +static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, + struct rbd_snap *snap) +{ + list_del(&snap->node); + device_unregister(&snap->dev); +} + +static int rbd_register_snap_dev(struct rbd_device *rbd_dev, + struct rbd_snap *snap, + struct device *parent) +{ + struct device *dev = &snap->dev; + int ret; + + dev->type = &rbd_snap_device_type; + dev->parent = parent; + dev->release = rbd_snap_dev_release; + dev_set_name(dev, "snap_%s", snap->name); + ret = device_register(dev); + + return ret; +} + +static int __rbd_add_snap_dev(struct rbd_device *rbd_dev, + int i, const char *name, + struct rbd_snap **snapp) +{ + int ret; + struct rbd_snap *snap = kzalloc(sizeof(*snap), GFP_KERNEL); + if (!snap) + return -ENOMEM; + snap->name = kstrdup(name, GFP_KERNEL); + snap->size = rbd_dev->header.snap_sizes[i]; + snap->id = rbd_dev->header.snapc->snaps[i]; + if (device_is_registered(&rbd_dev->dev)) { + ret = rbd_register_snap_dev(rbd_dev, snap, + &rbd_dev->dev); + if (ret < 0) + goto err; + } + *snapp = snap; + return 0; +err: + kfree(snap->name); + kfree(snap); + return ret; +} + +/* + * search for the previous snap in a null delimited string list + */ +const char *rbd_prev_snap_name(const char *name, const char *start) +{ + if (name < start + 2) + return NULL; + + name -= 2; + while (*name) { + if (name == start) + return start; + name--; + } + return name + 1; +} + +/* + * compare the old list of snapshots that we have to what's in the header + * and update it accordingly. Note that the header holds the snapshots + * in a reverse order (from newest to oldest) and we need to go from + * older to new so that we don't get a duplicate snap name when + * doing the process (e.g., removed snapshot and recreated a new + * one with the same name. + */ +static int __rbd_init_snaps_header(struct rbd_device *rbd_dev) +{ + const char *name, *first_name; + int i = rbd_dev->header.total_snaps; + struct rbd_snap *snap, *old_snap = NULL; + int ret; + struct list_head *p, *n; + + first_name = rbd_dev->header.snap_names; + name = first_name + rbd_dev->header.snap_names_len; + + list_for_each_prev_safe(p, n, &rbd_dev->snaps) { + u64 cur_id; + + old_snap = list_entry(p, struct rbd_snap, node); + + if (i) + cur_id = rbd_dev->header.snapc->snaps[i - 1]; + + if (!i || old_snap->id < cur_id) { + /* old_snap->id was skipped, thus was removed */ + __rbd_remove_snap_dev(rbd_dev, old_snap); + continue; + } + if (old_snap->id == cur_id) { + /* we have this snapshot already */ + i--; + name = rbd_prev_snap_name(name, first_name); + continue; + } + for (; i > 0; + i--, name = rbd_prev_snap_name(name, first_name)) { + if (!name) { + WARN_ON(1); + return -EINVAL; + } + cur_id = rbd_dev->header.snapc->snaps[i]; + /* snapshot removal? handle it above */ + if (cur_id >= old_snap->id) + break; + /* a new snapshot */ + ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); + if (ret < 0) + return ret; + + /* note that we add it backward so using n and not p */ + list_add(&snap->node, n); + p = &snap->node; + } + } + /* we're done going over the old snap list, just add what's left */ + for (; i > 0; i--) { + name = rbd_prev_snap_name(name, first_name); + if (!name) { + WARN_ON(1); + return -EINVAL; + } + ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); + if (ret < 0) + return ret; + list_add(&snap->node, &rbd_dev->snaps); + } + + return 0; +} + + +static void rbd_root_dev_release(struct device *dev) +{ +} + +static struct device rbd_root_dev = { + .init_name = "rbd", + .release = rbd_root_dev_release, +}; + +static int rbd_bus_add_dev(struct rbd_device *rbd_dev) +{ + int ret = -ENOMEM; + struct device *dev; + struct rbd_snap *snap; + + mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); + dev = &rbd_dev->dev; + + dev->bus = &rbd_bus_type; + dev->type = &rbd_device_type; + dev->parent = &rbd_root_dev; + dev->release = rbd_dev_release; + dev_set_name(dev, "%d", rbd_dev->id); + ret = device_register(dev); + if (ret < 0) + goto done_free; + + list_for_each_entry(snap, &rbd_dev->snaps, node) { + ret = rbd_register_snap_dev(rbd_dev, snap, + &rbd_dev->dev); + if (ret < 0) break; } mutex_unlock(&ctl_mutex); - return n; + return 0; +done_free: + mutex_unlock(&ctl_mutex); + return ret; } -static ssize_t class_rbd_add(struct class *c, - struct class_attribute *attr, - const char *buf, size_t count) +static void rbd_bus_del_dev(struct rbd_device *rbd_dev) +{ + device_unregister(&rbd_dev->dev); +} + +static ssize_t rbd_add(struct bus_type *bus, const char *buf, size_t count) { struct ceph_osd_client *osdc; struct rbd_device *rbd_dev; @@ -1419,6 +1728,7 @@ static ssize_t class_rbd_add(struct class *c, /* static rbd_device initialization */ spin_lock_init(&rbd_dev->lock); INIT_LIST_HEAD(&rbd_dev->node); + INIT_LIST_HEAD(&rbd_dev->snaps); /* generate unique id: find highest unique id, add one */ mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); @@ -1478,6 +1788,9 @@ static ssize_t class_rbd_add(struct class *c, } rbd_dev->major = irc; + rc = rbd_bus_add_dev(rbd_dev); + if (rc) + goto err_out_disk; /* set up and announce blkdev mapping */ rc = rbd_init_disk(rbd_dev); if (rc) @@ -1487,6 +1800,8 @@ static ssize_t class_rbd_add(struct class *c, err_out_blkdev: unregister_blkdev(rbd_dev->major, rbd_dev->name); +err_out_disk: + rbd_free_disk(rbd_dev); err_out_client: rbd_put_client(rbd_dev); mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); @@ -1518,35 +1833,10 @@ static struct rbd_device *__rbd_get_dev(unsigned long id) return NULL; } -static ssize_t class_rbd_remove(struct class *c, - struct class_attribute *attr, - const char *buf, - size_t count) +static void rbd_dev_release(struct device *dev) { - struct rbd_device *rbd_dev = NULL; - int target_id, rc; - unsigned long ul; - - rc = strict_strtoul(buf, 10, &ul); - if (rc) - return rc; - - /* convert to int; abort if we lost anything in the conversion */ - target_id = (int) ul; - if (target_id != ul) - return -EINVAL; - - /* remove object from list immediately */ - mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); - - rbd_dev = __rbd_get_dev(target_id); - if (rbd_dev) - list_del_init(&rbd_dev->node); - - mutex_unlock(&ctl_mutex); - - if (!rbd_dev) - return -ENOENT; + struct rbd_device *rbd_dev = + container_of(dev, struct rbd_device, dev); rbd_put_client(rbd_dev); @@ -1557,67 +1847,11 @@ static ssize_t class_rbd_remove(struct class *c, /* release module ref */ module_put(THIS_MODULE); - - return count; } -static ssize_t class_rbd_snaps_list(struct class *c, - struct class_attribute *attr, - char *data) -{ - struct rbd_device *rbd_dev = NULL; - struct list_head *tmp; - struct rbd_image_header *header; - int i, n = 0, max = PAGE_SIZE; - int ret; - - mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); - - n += snprintf(data, max, "#id\tsnap\tKB\n"); - - list_for_each(tmp, &rbd_dev_list) { - char *names, *p; - struct ceph_snap_context *snapc; - - rbd_dev = list_entry(tmp, struct rbd_device, node); - header = &rbd_dev->header; - - down_read(&header->snap_rwsem); - - names = header->snap_names; - snapc = header->snapc; - - n += snprintf(data + n, max - n, "%d\t%s\t%lld%s\n", - rbd_dev->id, RBD_SNAP_HEAD_NAME, - header->image_size >> 10, - (!rbd_dev->cur_snap ? " (*)" : "")); - if (n == max) - break; - - p = names; - for (i = 0; i < header->total_snaps; i++, p += strlen(p) + 1) { - n += snprintf(data + n, max - n, "%d\t%s\t%lld%s\n", - rbd_dev->id, p, header->snap_sizes[i] >> 10, - (rbd_dev->cur_snap && - (snap_index(header, i) == rbd_dev->cur_snap) ? - " (*)" : "")); - if (n == max) - break; - } - - up_read(&header->snap_rwsem); - } - - - ret = n; - mutex_unlock(&ctl_mutex); - return ret; -} - -static ssize_t class_rbd_snaps_refresh(struct class *c, - struct class_attribute *attr, - const char *buf, - size_t count) +static ssize_t rbd_remove(struct bus_type *bus, + const char *buf, + size_t count) { struct rbd_device *rbd_dev = NULL; int target_id, rc; @@ -1641,95 +1875,70 @@ static ssize_t class_rbd_snaps_refresh(struct class *c, goto done; } - rc = rbd_update_snaps(rbd_dev); - if (rc < 0) - ret = rc; + list_del_init(&rbd_dev->node); + + __rbd_remove_all_snaps(rbd_dev); + rbd_bus_del_dev(rbd_dev); done: mutex_unlock(&ctl_mutex); return ret; } -static ssize_t class_rbd_snap_create(struct class *c, - struct class_attribute *attr, - const char *buf, - size_t count) +static ssize_t rbd_snap_add(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t count) { - struct rbd_device *rbd_dev = NULL; - int target_id, ret; - char *name; - - name = kmalloc(RBD_MAX_SNAP_NAME_LEN + 1, GFP_KERNEL); + struct rbd_device *rbd_dev = dev_to_rbd(dev); + int ret; + char *name = kmalloc(count + 1, GFP_KERNEL); if (!name) return -ENOMEM; - /* parse snaps add command */ - if (sscanf(buf, "%d " - "%" __stringify(RBD_MAX_SNAP_NAME_LEN) "s", - &target_id, - name) != 2) { - ret = -EINVAL; - goto done; - } + snprintf(name, count, "%s", buf); mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); - rbd_dev = __rbd_get_dev(target_id); - if (!rbd_dev) { - ret = -ENOENT; - goto done_unlock; - } - ret = rbd_header_add_snap(rbd_dev, name, GFP_KERNEL); if (ret < 0) goto done_unlock; - ret = rbd_update_snaps(rbd_dev); + ret = __rbd_update_snaps(rbd_dev); if (ret < 0) goto done_unlock; ret = count; done_unlock: mutex_unlock(&ctl_mutex); -done: kfree(name); return ret; } -static ssize_t class_rbd_rollback(struct class *c, - struct class_attribute *attr, - const char *buf, - size_t count) +static ssize_t rbd_snap_rollback(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t count) { - struct rbd_device *rbd_dev = NULL; - int target_id, ret; + struct rbd_device *rbd_dev = dev_to_rbd(dev); + int ret; u64 snapid; - char snap_name[RBD_MAX_SNAP_NAME_LEN]; u64 cur_ofs; - char *seg_name; + char *seg_name = NULL; + char *snap_name = kmalloc(count + 1, GFP_KERNEL); + ret = -ENOMEM; + if (!snap_name) + return ret; /* parse snaps add command */ - if (sscanf(buf, "%d " - "%" __stringify(RBD_MAX_SNAP_NAME_LEN) "s", - &target_id, - snap_name) != 2) { - return -EINVAL; - } - - ret = -ENOMEM; + snprintf(snap_name, count, "%s", buf); seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); if (!seg_name) - return ret; + goto done; mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); - rbd_dev = __rbd_get_dev(target_id); - if (!rbd_dev) { - ret = -ENOENT; - goto done_unlock; - } - ret = snap_by_name(&rbd_dev->header, snap_name, &snapid, NULL); if (ret < 0) goto done_unlock; @@ -1750,7 +1959,7 @@ static ssize_t class_rbd_rollback(struct class *c, seg_name, ret); } - ret = rbd_update_snaps(rbd_dev); + ret = __rbd_update_snaps(rbd_dev); if (ret < 0) goto done_unlock; @@ -1758,57 +1967,42 @@ static ssize_t class_rbd_rollback(struct class *c, done_unlock: mutex_unlock(&ctl_mutex); +done: kfree(seg_name); + kfree(snap_name); return ret; } -static struct class_attribute class_rbd_attrs[] = { - __ATTR(add, 0200, NULL, class_rbd_add), - __ATTR(remove, 0200, NULL, class_rbd_remove), - __ATTR(list, 0444, class_rbd_list, NULL), - __ATTR(snaps_refresh, 0200, NULL, class_rbd_snaps_refresh), - __ATTR(snap_create, 0200, NULL, class_rbd_snap_create), - __ATTR(snaps_list, 0444, class_rbd_snaps_list, NULL), - __ATTR(snap_rollback, 0200, NULL, class_rbd_rollback), +static struct bus_attribute rbd_bus_attrs[] = { + __ATTR(add, S_IWUSR, NULL, rbd_add), + __ATTR(remove, S_IWUSR, NULL, rbd_remove), __ATTR_NULL }; /* * create control files in sysfs - * /sys/class/rbd/... + * /sys/bus/rbd/... */ static int rbd_sysfs_init(void) { - int ret = -ENOMEM; + int ret; - class_rbd = kzalloc(sizeof(*class_rbd), GFP_KERNEL); - if (!class_rbd) - goto out; + rbd_bus_type.bus_attrs = rbd_bus_attrs; - class_rbd->name = DRV_NAME; - class_rbd->owner = THIS_MODULE; - class_rbd->class_release = class_rbd_release; - class_rbd->class_attrs = class_rbd_attrs; + ret = bus_register(&rbd_bus_type); + if (ret < 0) + return ret; - ret = class_register(class_rbd); - if (ret) - goto out_class; - return 0; + ret = device_register(&rbd_root_dev); -out_class: - kfree(class_rbd); - class_rbd = NULL; - pr_err(DRV_NAME ": failed to create class rbd\n"); -out: return ret; } static void rbd_sysfs_cleanup(void) { - if (class_rbd) - class_destroy(class_rbd); - class_rbd = NULL; + device_unregister(&rbd_root_dev); + bus_unregister(&rbd_bus_type); } int __init rbd_init(void) -- cgit v1.2.1 From 667c78afaec0ac500908e191e8f236e9578d7b1f Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Wed, 8 Dec 2010 12:39:12 -0800 Subject: xen: Provide a variant of __RING_SIZE() that is an integer constant expression Without this, gcc 4.5 won't compile xen-netfront and xen-blkfront, where this is being used to specify array sizes. Signed-off-by: Jan Beulich Signed-off-by: Jeremy Fitzhardinge Cc: Jens Axboe Cc: David Miller Cc: Stable Kernel Signed-off-by: Linus Torvalds --- drivers/block/xen-blkfront.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/block') diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 4f9e22f29138..657873e4328d 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -72,7 +72,7 @@ struct blk_shadow { static DEFINE_MUTEX(blkfront_mutex); static const struct block_device_operations xlvbd_block_fops; -#define BLK_RING_SIZE __RING_SIZE((struct blkif_sring *)0, PAGE_SIZE) +#define BLK_RING_SIZE __CONST_RING_SIZE(blkif, PAGE_SIZE) /* * We have one of these per vbd, whether ide, scsi or 'other'. They -- cgit v1.2.1 From 0fc13c8995cd96f4123de400c71c223d80400ed9 Mon Sep 17 00:00:00 2001 From: "Stephen M. Cameron" Date: Fri, 17 Dec 2010 09:01:37 +0100 Subject: cciss: fix cciss_revalidate panic If you delete a logical drive, and then run BLKRRPART (e.g. via fdisk) on a logical drive which is "after" the deleted logical drive in the h->drv[] array, then cciss_revalidate panics because it will access the null pointer h->drv[x] when x hits the deleted drive. Signed-off-by: Stephen M. Cameron Cc: stable@kernel.org Signed-off-by: Jens Axboe --- drivers/block/cciss.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/block') diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index f291587d753e..233e06c29ff4 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -2834,6 +2834,8 @@ static int cciss_revalidate(struct gendisk *disk) InquiryData_struct *inq_buff = NULL; for (logvol = 0; logvol < CISS_MAX_LUN; logvol++) { + if (!h->drv[logvol]) + continue if (memcmp(h->drv[logvol]->LunID, drv->LunID, sizeof(drv->LunID)) == 0) { FOUND = 1; -- cgit v1.2.1 From 453434cf3fdcd3954bb52460e37d4945a0913d3e Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Mon, 20 Dec 2010 21:21:49 -0800 Subject: Fix build error in drivers/block/cciss.c .. caused by a missing semi-colon, introduced in commit 0fc13c8995cd ("cciss: fix cciss_revalidate panic"). Reported-by: Stephen Rothwell Reported-by: Thiago Farina Cc: Jens Axboe Signed-off-by: Linus Torvalds --- drivers/block/cciss.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/block') diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index 233e06c29ff4..8e0f9256eb58 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -2835,7 +2835,7 @@ static int cciss_revalidate(struct gendisk *disk) for (logvol = 0; logvol < CISS_MAX_LUN; logvol++) { if (!h->drv[logvol]) - continue + continue; if (memcmp(h->drv[logvol]->LunID, drv->LunID, sizeof(drv->LunID)) == 0) { FOUND = 1; -- cgit v1.2.1