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authorJens Axboe <axboe@fb.com>2014-12-10 13:58:17 -0700
committerJens Axboe <axboe@fb.com>2014-12-10 13:58:17 -0700
commitd8ead9b763cab553f82a6f16015d3ace5f9c6653 (patch)
tree76743bcb34cfe103b759cc7f9d4a6dc1f15404c6 /drivers/block
parent97fe383222cb8a01fb67a8823498ad2edcc20b35 (diff)
parentfdf9b9650366c575650edcaaede3a68efbb24919 (diff)
Merge branch 'for-jens-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen into for-3.19/drivers
Konrad writes: These are two fixes for Xen blkfront. They harden how it deals with broken backends.
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/xen-blkfront.c65
1 files changed, 39 insertions, 26 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 5ac312f6e0b..2236c6f3160 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -126,7 +126,6 @@ struct blkfront_info
unsigned int persistent_gnts_c;
unsigned long shadow_free;
unsigned int feature_flush;
- unsigned int flush_op;
unsigned int feature_discard:1;
unsigned int feature_secdiscard:1;
unsigned int discard_granularity;
@@ -479,7 +478,19 @@ static int blkif_queue_request(struct request *req)
* way. (It's also a FLUSH+FUA, since it is
* guaranteed ordered WRT previous writes.)
*/
- ring_req->operation = info->flush_op;
+ switch (info->feature_flush &
+ ((REQ_FLUSH|REQ_FUA))) {
+ case REQ_FLUSH|REQ_FUA:
+ ring_req->operation =
+ BLKIF_OP_WRITE_BARRIER;
+ break;
+ case REQ_FLUSH:
+ ring_req->operation =
+ BLKIF_OP_FLUSH_DISKCACHE;
+ break;
+ default:
+ ring_req->operation = 0;
+ }
}
ring_req->u.rw.nr_segments = nseg;
}
@@ -582,12 +593,14 @@ static inline void flush_requests(struct blkfront_info *info)
notify_remote_via_irq(info->irq);
}
-static inline bool blkif_request_flush_valid(struct request *req,
- struct blkfront_info *info)
+static inline bool blkif_request_flush_invalid(struct request *req,
+ struct blkfront_info *info)
{
return ((req->cmd_type != REQ_TYPE_FS) ||
- ((req->cmd_flags & (REQ_FLUSH | REQ_FUA)) &&
- !info->flush_op));
+ ((req->cmd_flags & REQ_FLUSH) &&
+ !(info->feature_flush & REQ_FLUSH)) ||
+ ((req->cmd_flags & REQ_FUA) &&
+ !(info->feature_flush & REQ_FUA)));
}
/*
@@ -612,8 +625,8 @@ static void do_blkif_request(struct request_queue *rq)
blk_start_request(req);
- if (blkif_request_flush_valid(req, info)) {
- __blk_end_request_all(req, -EIO);
+ if (blkif_request_flush_invalid(req, info)) {
+ __blk_end_request_all(req, -EOPNOTSUPP);
continue;
}
@@ -683,20 +696,26 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size,
return 0;
}
+static const char *flush_info(unsigned int feature_flush)
+{
+ switch (feature_flush & ((REQ_FLUSH | REQ_FUA))) {
+ case REQ_FLUSH|REQ_FUA:
+ return "barrier: enabled;";
+ case REQ_FLUSH:
+ return "flush diskcache: enabled;";
+ default:
+ return "barrier or flush: disabled;";
+ }
+}
static void xlvbd_flush(struct blkfront_info *info)
{
blk_queue_flush(info->rq, info->feature_flush);
- printk(KERN_INFO "blkfront: %s: %s: %s %s %s %s %s\n",
- info->gd->disk_name,
- info->flush_op == BLKIF_OP_WRITE_BARRIER ?
- "barrier" : (info->flush_op == BLKIF_OP_FLUSH_DISKCACHE ?
- "flush diskcache" : "barrier or flush"),
- info->feature_flush ? "enabled;" : "disabled;",
- "persistent grants:",
- info->feature_persistent ? "enabled;" : "disabled;",
- "indirect descriptors:",
- info->max_indirect_segments ? "enabled;" : "disabled;");
+ pr_info("blkfront: %s: %s %s %s %s %s\n",
+ info->gd->disk_name, flush_info(info->feature_flush),
+ "persistent grants:", info->feature_persistent ?
+ "enabled;" : "disabled;", "indirect descriptors:",
+ info->max_indirect_segments ? "enabled;" : "disabled;");
}
static int xen_translate_vdev(int vdevice, int *minor, unsigned int *offset)
@@ -1188,7 +1207,6 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
if (error == -EOPNOTSUPP)
error = 0;
info->feature_flush = 0;
- info->flush_op = 0;
xlvbd_flush(info);
}
/* fall through */
@@ -1808,7 +1826,6 @@ static void blkfront_connect(struct blkfront_info *info)
physical_sector_size = sector_size;
info->feature_flush = 0;
- info->flush_op = 0;
err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
"feature-barrier", "%d", &barrier,
@@ -1821,10 +1838,8 @@ static void blkfront_connect(struct blkfront_info *info)
*
* If there are barriers, then we use flush.
*/
- if (!err && barrier) {
+ if (!err && barrier)
info->feature_flush = REQ_FLUSH | REQ_FUA;
- info->flush_op = BLKIF_OP_WRITE_BARRIER;
- }
/*
* And if there is "feature-flush-cache" use that above
* barriers.
@@ -1833,10 +1848,8 @@ static void blkfront_connect(struct blkfront_info *info)
"feature-flush-cache", "%d", &flush,
NULL);
- if (!err && flush) {
+ if (!err && flush)
info->feature_flush = REQ_FLUSH;
- info->flush_op = BLKIF_OP_FLUSH_DISKCACHE;
- }
err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
"feature-discard", "%d", &discard,