diff options
| author | David Teigland <teigland@redhat.com> | 2006-06-26 00:27:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-26 09:58:36 -0700 |
| commit | c2ade42dd35466d90aa6fc7cc717f396e165492f (patch) | |
| tree | 245baeabfea43a3b2654adb962e776a877da0059 | |
| parent | 17b2f66f2a39a4e4d1ed456f35ee3bb598e41d35 (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>
| -rw-r--r-- | drivers/md/dm-table.c | 38 | ||||
| -rw-r--r-- | include/linux/device-mapper.h | 6 |
2 files changed, 44 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 10c9439635c..827b648fac5 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, return 0; } +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 --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 010c8c5eeb3..61103d2bc24 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -227,5 +227,11 @@ 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 */ |