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git.karo-electronics.de Git - karo-tx-linux.git/commit
kvm tools: Fix read-only support in QCOW
If the user specifies a read-only image, make sure we never write to it.
Booting to a read-only image looks like this now:
$ ./kvm run -i ~/images/linux-0.2.qcow2,ro
[ snip ]
[ 1.250236] end_request: I/O error, dev vda, sector 32856
[ 1.252867] Buffer I/O error on device vda, logical block 16428
[ 1.255706] lost page write due to I/O error on vda
[ 1.258120] EXT4-fs (vda): previous I/O error to superblock detected
[ 1.261157] end_request: I/O error, dev vda, sector 2
[ 1.263333] Buffer I/O error on device vda, logical block 1
[ 1.264944] lost page write due to I/O error on vda
[ 1.266139] EXT4-fs (vda): re-mounted. Opts:
[ 1.284390] end_request: I/O error, dev vda, sector 35842
[ 1.285679] Buffer I/O error on device vda, logical block 17921
[ 1.287175] EXT4-fs warning (device vda): ext4_end_bio:259: I/O error writing to inode 3756 (offset 0 size 1024 starting block 17922)
Reported-by: Sasha Levin <levinsasha928@gmail.com>
Cc: Asias He <asias.hejun@gmail.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Prasad Joshi <prasadjoshi124@gmail.com>
Cc: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>