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dm ioctl: forbid messages to devices being deleted

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Once we begin deleting a device, prevent any further messages being sent
to targets of its table (to avoid races).

Signed-off-by: Mike Anderson <andmike@linux.vnet.ibm.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mike Anderson
2009-12-10 23:52:20 +00:00
committed by Alasdair G Kergon
parent 432a212c0d
commit c50abeb380
1 changed files with 6 additions and 0 deletions
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drivers/md/dm-ioctl.c
+6
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@@ -1303,6 +1303,11 @@ static int target_message(struct dm_ioctl *param, size_t param_size)
if (!table) if (!table)
goto out_argv; goto out_argv;
if (dm_deleting_md(md)) {
r = -ENXIO;
goto out_table;
}
ti = dm_table_find_target(table, tmsg->sector); ti = dm_table_find_target(table, tmsg->sector);
if (!dm_target_is_valid(ti)) { if (!dm_target_is_valid(ti)) {
DMWARN("Target message sector outside device."); DMWARN("Target message sector outside device.");
@@ -1314,6 +1319,7 @@ static int target_message(struct dm_ioctl *param, size_t param_size)
r = -EINVAL; r = -EINVAL;
} }
out_table:
dm_table_put(table); dm_table_put(table);
out_argv: out_argv:
kfree(argv); kfree(argv);