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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 17:39:57 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 17:39:57 +0000
commitdc50eab76b709d68175a358d6e23a5a3890764d3 (patch)
treec754d0390db060af0213ff994f0ac310e4cfd6e9 /drivers/md/dm-target.c
parentAdding debian version 6.6.15-2. (diff)
downloadlinux-dc50eab76b709d68175a358d6e23a5a3890764d3.tar.xz
linux-dc50eab76b709d68175a358d6e23a5a3890764d3.zip
Merging upstream version 6.7.7.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/md/dm-target.c')
-rw-r--r--drivers/md/dm-target.c106
1 files changed, 103 insertions, 3 deletions
diff --git a/drivers/md/dm-target.c b/drivers/md/dm-target.c
index 27e2992ff2..0c4efb0bef 100644
--- a/drivers/md/dm-target.c
+++ b/drivers/md/dm-target.c
@@ -116,9 +116,63 @@ EXPORT_SYMBOL(dm_unregister_target);
* io-err: always fails an io, useful for bringing
* up LVs that have holes in them.
*/
+struct io_err_c {
+ struct dm_dev *dev;
+ sector_t start;
+};
+
+static int io_err_get_args(struct dm_target *tt, unsigned int argc, char **args)
+{
+ unsigned long long start;
+ struct io_err_c *ioec;
+ char dummy;
+ int ret;
+
+ ioec = kmalloc(sizeof(*ioec), GFP_KERNEL);
+ if (!ioec) {
+ tt->error = "Cannot allocate io_err context";
+ return -ENOMEM;
+ }
+
+ ret = -EINVAL;
+ if (sscanf(args[1], "%llu%c", &start, &dummy) != 1 ||
+ start != (sector_t)start) {
+ tt->error = "Invalid device sector";
+ goto bad;
+ }
+ ioec->start = start;
+
+ ret = dm_get_device(tt, args[0], dm_table_get_mode(tt->table), &ioec->dev);
+ if (ret) {
+ tt->error = "Device lookup failed";
+ goto bad;
+ }
+
+ tt->private = ioec;
+
+ return 0;
+
+bad:
+ kfree(ioec);
+
+ return ret;
+}
+
static int io_err_ctr(struct dm_target *tt, unsigned int argc, char **args)
{
/*
+ * If we have arguments, assume it is the path to the backing
+ * block device and its mapping start sector (same as dm-linear).
+ * In this case, get the device so that we can get its limits.
+ */
+ if (argc == 2) {
+ int ret = io_err_get_args(tt, argc, args);
+
+ if (ret)
+ return ret;
+ }
+
+ /*
* Return error for discards instead of -EOPNOTSUPP
*/
tt->num_discard_bios = 1;
@@ -129,7 +183,12 @@ static int io_err_ctr(struct dm_target *tt, unsigned int argc, char **args)
static void io_err_dtr(struct dm_target *tt)
{
- /* empty */
+ struct io_err_c *ioec = tt->private;
+
+ if (ioec) {
+ dm_put_device(tt, ioec->dev);
+ kfree(ioec);
+ }
}
static int io_err_map(struct dm_target *tt, struct bio *bio)
@@ -149,6 +208,45 @@ static void io_err_release_clone_rq(struct request *clone,
{
}
+#ifdef CONFIG_BLK_DEV_ZONED
+static sector_t io_err_map_sector(struct dm_target *ti, sector_t bi_sector)
+{
+ struct io_err_c *ioec = ti->private;
+
+ return ioec->start + dm_target_offset(ti, bi_sector);
+}
+
+static int io_err_report_zones(struct dm_target *ti,
+ struct dm_report_zones_args *args, unsigned int nr_zones)
+{
+ struct io_err_c *ioec = ti->private;
+
+ /*
+ * This should never be called when we do not have a backing device
+ * as that mean the target is not a zoned one.
+ */
+ if (WARN_ON_ONCE(!ioec))
+ return -EIO;
+
+ return dm_report_zones(ioec->dev->bdev, ioec->start,
+ io_err_map_sector(ti, args->next_sector),
+ args, nr_zones);
+}
+#else
+#define io_err_report_zones NULL
+#endif
+
+static int io_err_iterate_devices(struct dm_target *ti,
+ iterate_devices_callout_fn fn, void *data)
+{
+ struct io_err_c *ioec = ti->private;
+
+ if (!ioec)
+ return 0;
+
+ return fn(ti, ioec->dev, ioec->start, ti->len, data);
+}
+
static void io_err_io_hints(struct dm_target *ti, struct queue_limits *limits)
{
limits->max_discard_sectors = UINT_MAX;
@@ -165,15 +263,17 @@ static long io_err_dax_direct_access(struct dm_target *ti, pgoff_t pgoff,
static struct target_type error_target = {
.name = "error",
- .version = {1, 6, 0},
- .features = DM_TARGET_WILDCARD,
+ .version = {1, 7, 0},
+ .features = DM_TARGET_WILDCARD | DM_TARGET_ZONED_HM,
.ctr = io_err_ctr,
.dtr = io_err_dtr,
.map = io_err_map,
.clone_and_map_rq = io_err_clone_and_map_rq,
.release_clone_rq = io_err_release_clone_rq,
+ .iterate_devices = io_err_iterate_devices,
.io_hints = io_err_io_hints,
.direct_access = io_err_dax_direct_access,
+ .report_zones = io_err_report_zones,
};
int __init dm_target_init(void)