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authorDavid Teigland <teigland@redhat.com>2006-06-26 03:27:33 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 12:58:36 -0400
commitc2ade42dd35466d90aa6fc7cc717f396e165492f (patch)
tree245baeabfea43a3b2654adb962e776a877da0059 /drivers/md
parent17b2f66f2a39a4e4d1ed456f35ee3bb598e41d35 (diff)
[PATCH] dm: create error table
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@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-table.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 10c9439635ca..827b648fac50 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -237,6 +237,44 @@ int dm_table_create(struct dm_table **result, int mode,
237 return 0; 237 return 0;
238} 238}
239 239
240int dm_create_error_table(struct dm_table **result, struct mapped_device *md)
241{
242 struct dm_table *t;
243 sector_t dev_size = 1;
244 int r;
245
246 /*
247 * Find current size of device.
248 * Default to 1 sector if inactive.
249 */
250 t = dm_get_table(md);
251 if (t) {
252 dev_size = dm_table_get_size(t);
253 dm_table_put(t);
254 }
255
256 r = dm_table_create(&t, FMODE_READ, 1, md);
257 if (r)
258 return r;
259
260 r = dm_table_add_target(t, "error", 0, dev_size, NULL);
261 if (r)
262 goto out;
263
264 r = dm_table_complete(t);
265 if (r)
266 goto out;
267
268 *result = t;
269
270out:
271 if (r)
272 dm_table_put(t);
273
274 return r;
275}
276EXPORT_SYMBOL_GPL(dm_create_error_table);
277
240static void free_devices(struct list_head *devices) 278static void free_devices(struct list_head *devices)
241{ 279{
242 struct list_head *tmp, *next; 280 struct list_head *tmp, *next;