+++ /dev/null
-This patch is no longer needed for Lustre. It is only included
-for testing and ease of using the same kernel with older Lustre
-versions. This testing functionality was replaced in Linux 3.0
-by the dm-flakey driver.
-
-This functionality is mainly used during testing, in order to
-simulate a server crash for ldiskfs by discarding all of the
-writes to the filesystem. For recovery testing we could simulate
-this by using a special loopback or DM device that also discards
-writes to the device.
-
-This functionality is also used by target "failback" in order
-to speed up service shutdown and takeover by the other node
-during controlled operation. However, it would also be possible
-to do this by simply allowing all of the in-flight requests to
-complete and then waiting for the service to stop. This will
-also be needed by the DMU-OSD, because discarding of writes on
-a DMU-based target is not safe as it could trigger a storage
-failure if the data is ever read from disk again and the
-checksum does not match that expected by the block pointer.
-
-Index: linux-4.4.59-1/block/blk-core.c
-===================================================================
---- linux-4.4.59-1.orig/block/blk-core.c
-+++ linux-4.4.59-1/block/blk-core.c
-@@ -1804,6 +1804,8 @@ static inline bool should_fail_request(s
-
- #endif /* CONFIG_FAIL_MAKE_REQUEST */
-
-+int dev_check_rdonly(struct block_device *bdev);
-+
- /*
- * Check whether this bio extends beyond the end of the device.
- */
-@@ -1857,6 +1859,12 @@ generic_make_request_checks(struct bio *
- goto end_io;
- }
-
-+ /* this is cfs's dev_rdonly check */
-+ if (bio_data_dir(bio) && dev_check_rdonly(bio->bi_bdev)) {
-+ err = 0;
-+ goto end_io;
-+ }
-+
- part = bio->bi_bdev->bd_part;
- if (should_fail_request(part, bio->bi_iter.bi_size) ||
- should_fail_request(&part_to_disk(part)->part0,
-@@ -3454,6 +3462,99 @@ void blk_set_runtime_active(struct reque
- EXPORT_SYMBOL(blk_set_runtime_active);
- #endif
-
-+/*
-+ * Debug code for turning block devices "read-only" (will discard writes
-+ * silently). This is for filesystem crash/recovery testing.
-+ */
-+struct deventry {
-+ dev_t dev;
-+ struct deventry *next;
-+};
-+
-+static struct deventry *devlist = NULL;
-+static spinlock_t devlock = __SPIN_LOCK_UNLOCKED(devlock);
-+
-+int dev_check_rdonly(struct block_device *bdev)
-+{
-+ struct deventry *cur;
-+
-+ if (!bdev)
-+ return 0;
-+
-+ spin_lock(&devlock);
-+ cur = devlist;
-+ while(cur) {
-+ if (bdev->bd_dev == cur->dev) {
-+ spin_unlock(&devlock);
-+ return 1;
-+ }
-+ cur = cur->next;
-+ }
-+ spin_unlock(&devlock);
-+ return 0;
-+}
-+
-+void dev_set_rdonly(struct block_device *bdev)
-+{
-+ struct deventry *newdev, *cur;
-+
-+ if (!bdev)
-+ return;
-+
-+ newdev = kmalloc(sizeof(struct deventry), GFP_KERNEL);
-+ if (!newdev)
-+ return;
-+
-+ spin_lock(&devlock);
-+ cur = devlist;
-+ while(cur) {
-+ if (bdev->bd_dev == cur->dev) {
-+ spin_unlock(&devlock);
-+ kfree(newdev);
-+ return;
-+ }
-+ cur = cur->next;
-+ }
-+ newdev->dev = bdev->bd_dev;
-+ newdev->next = devlist;
-+ devlist = newdev;
-+ spin_unlock(&devlock);
-+ printk(KERN_WARNING "Turning device %s (%#x) read-only\n",
-+ bdev->bd_disk ? bdev->bd_disk->disk_name : "", bdev->bd_dev);
-+}
-+
-+void dev_clear_rdonly(struct block_device *bdev)
-+{
-+ struct deventry *cur, *last = NULL;
-+
-+ if (!bdev)
-+ return;
-+
-+ spin_lock(&devlock);
-+ cur = devlist;
-+ while(cur) {
-+ if (bdev->bd_dev == cur->dev) {
-+ if (last)
-+ last->next = cur->next;
-+ else
-+ devlist = cur->next;
-+ spin_unlock(&devlock);
-+ kfree(cur);
-+ printk(KERN_WARNING "Removing read-only on %s (%#x)\n",
-+ bdev->bd_disk ? bdev->bd_disk->disk_name :
-+ "unknown block", bdev->bd_dev);
-+ return;
-+ }
-+ last = cur;
-+ cur = cur->next;
-+ }
-+ spin_unlock(&devlock);
-+}
-+
-+EXPORT_SYMBOL(dev_set_rdonly);
-+EXPORT_SYMBOL(dev_clear_rdonly);
-+EXPORT_SYMBOL(dev_check_rdonly);
-+
- int __init blk_dev_init(void)
- {
- BUILD_BUG_ON(REQ_OP_LAST >= (1 << REQ_OP_BITS));
-Index: linux-4.4.59-1/fs/block_dev.c
-===================================================================
---- linux-4.4.59-1.orig/fs/block_dev.c
-+++ linux-4.4.59-1/fs/block_dev.c
-@@ -1914,6 +1914,7 @@ static void __blkdev_put(struct block_de
- if (bdev != bdev->bd_contains)
- victim = bdev->bd_contains;
- bdev->bd_contains = NULL;
-+ dev_clear_rdonly(bdev);
-
- put_disk(disk);
- module_put(owner);
-Index: linux-4.4.59-1/include/linux/fs.h
-===================================================================
---- linux-4.4.59-1.orig/include/linux/fs.h
-+++ linux-4.4.59-1/include/linux/fs.h
-@@ -2624,6 +2624,10 @@ extern void inode_sb_list_add(struct ino
- #ifdef CONFIG_BLOCK
- extern int bdev_read_only(struct block_device *);
- #endif
-+#define HAVE_CLEAR_RDONLY_ON_PUT
-+extern void dev_set_rdonly(struct block_device *bdev);
-+extern int dev_check_rdonly(struct block_device *bdev);
-+extern void dev_clear_rdonly(struct block_device *bdev);
- extern int set_blocksize(struct block_device *, int);
- extern int sb_set_blocksize(struct super_block *, int);
- extern int sb_min_blocksize(struct super_block *, int);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff