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authorAndrew Morton <akpm@osdl.org>2006-09-29 01:58:56 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 09:18:04 -0700
commit4d7dd8fd9557840162b724a8ac1366dd78a12dff (patch)
treeba67748bb0951a40a8921b5f2c05a4f961646415 /block
parent[PATCH] kernel/params: driver layer error checking (diff)
downloadlinux-dev-4d7dd8fd9557840162b724a8ac1366dd78a12dff.tar.xz
linux-dev-4d7dd8fd9557840162b724a8ac1366dd78a12dff.zip
[PATCH] blockdev.c: check driver layer errors
Check driver layer errors. Fix from: "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com> In blockdevc-check-errors.patch, add_bd_holder() is modified to return error values when some of its operation failed. Among them, it returns -EEXIST when a given bd_holder object already exists in the list. However, in this case, the function completed its work successfully and need no action by its caller other than freeing unused bd_holder object. So I think it's better to return success after freeing by itself. Otherwise, bd_claim-ing with same claim pointer will fail. Typically, lvresize will fails with following message: device-mapper: reload ioctl failed: Invalid argument and you'll see messages like below in kernel log: device-mapper: table: 254:13: linear: dm-linear: Device lookup failed device-mapper: ioctl: error adding target to table Similarly, it should not add bd_holder to the list if either one of symlinking fails. I don't have a test case for this to happen but it should cause dereference of freed pointer. If a matching bd_holder is found in bd_holder_list, add_bd_holder() completes its job by just incrementing the reference count. In this case, it should be considered as success but it used to return 'fail' to let the caller free temporary bd_holder. Fixed it to return success and free given object by itself. Also, if either one of symlinking fails, the bd_holder should not be added to the list so that it can be discarded later. Otherwise, the caller will free bd_holder which is in the list. Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Cc: "Randy.Dunlap" <rdunlap@xenotime.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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