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| author | Alasdair G Kergon <agk@redhat.com> | 2011-10-31 20:19:02 (GMT) |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2011-10-31 20:19:02 (GMT) |
| commit | cc6cbe141a20f6d876b161b60af38d93935bfa85 (patch) | |
| tree | 82fbbc48815503683b434c74b7eb18c15960f4f9 /drivers/md | |
| parent | 3791e2fc0e4b40d4188e79b0a99bfa6bce714a10 (diff) | |
| download | linux-cc6cbe141a20f6d876b161b60af38d93935bfa85.tar.xz | |
dm table: add always writeable feature
Add a target feature flag DM_TARGET_ALWAYS_WRITEABLE to indicate that a target
does not support read-only mode.
The initial implementation of the thin provisioning target uses this.
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-table.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 2ec3482..9917141 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -774,6 +774,12 @@ int dm_table_add_target(struct dm_table *t, const char *type, t->singleton = 1; } + if (dm_target_always_writeable(tgt->type) && !(t->mode & FMODE_WRITE)) { + DMERR("%s: target type %s may not be included in read-only tables", + dm_device_name(t->md), type); + return -EINVAL; + } + tgt->table = t; tgt->begin = start; tgt->len = len; |