The patch titled
dm: create error table
has been added to the -mm tree. Its filename is
dm-create-error-table.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: dm: create error table
From: David Teigland <teigland@xxxxxxxxxx>
Add a library function dm_create_error_table() to create a table that rejects
any I/O sent to a device with EIO.
Signed-off-by: Alasdair G Kergon <agk@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/md/dm-table.c | 38 ++++++++++++++++++++++++++++++++
include/linux/device-mapper.h | 6 +++++
2 files changed, 44 insertions(+)
diff -puN drivers/md/dm-table.c~dm-create-error-table drivers/md/dm-table.c
--- a/drivers/md/dm-table.c~dm-create-error-table
+++ a/drivers/md/dm-table.c
@@ -238,6 +238,44 @@ int dm_table_create(struct dm_table **re
}
EXPORT_SYMBOL_GPL(dm_table_create);
+int dm_create_error_table(struct dm_table **result, struct mapped_device *md)
+{
+ struct dm_table *t;
+ sector_t dev_size = 1;
+ int r;
+
+ /*
+ * Find current size of device.
+ * Default to 1 sector if inactive.
+ */
+ t = dm_get_table(md);
+ if (t) {
+ dev_size = dm_table_get_size(t);
+ dm_table_put(t);
+ }
+
+ r = dm_table_create(&t, FMODE_READ, 1, md);
+ if (r)
+ return r;
+
+ r = dm_table_add_target(t, "error", 0, dev_size, NULL);
+ if (r)
+ goto out;
+
+ r = dm_table_complete(t);
+ if (r)
+ goto out;
+
+ *result = t;
+
+out:
+ if (r)
+ dm_table_put(t);
+
+ return r;
+}
+EXPORT_SYMBOL_GPL(dm_create_error_table);
+
static void free_devices(struct list_head *devices)
{
struct list_head *tmp, *next;
diff -puN include/linux/device-mapper.h~dm-create-error-table include/linux/device-mapper.h
--- a/include/linux/device-mapper.h~dm-create-error-table
+++ a/include/linux/device-mapper.h
@@ -232,5 +232,11 @@ void dm_table_event(struct dm_table *t);
*/
int dm_swap_table(struct mapped_device *md, struct dm_table *t);
+/*
+ * Prepare a table for a device that will error all I/O.
+ * To make it active, call dm_suspend(), dm_swap_table() then dm_resume().
+ */
+int dm_create_error_table(struct dm_table **result, struct mapped_device *md);
+
#endif /* __KERNEL__ */
#endif /* _LINUX_DEVICE_MAPPER_H */
_
Patches currently in -mm which might be from teigland@xxxxxxxxxx are
git-gfs2.patch
dm-table-split_args-handle-no-input.patch
dm-create-error-table.patch
-
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