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4d48a542b4
Fix a problem that causes I/O to a disconnected (or partially initialized) nbd device to hang indefinitely. To reproduce: # ioctl NBD_SET_SIZE_BLOCKS /dev/nbd23 514048 # dd if=/dev/nbd23 of=/dev/null bs=4096 count=1 ...hangs... This can also occur when an nbd device loses its nbd-client/server connection. Although we clear the queue of any outstanding I/Os after the client/server connection fails, any additional I/Os that get queued later will hang. This bug may also be the problem reported in this bug report: http://bugzilla.kernel.org/show_bug.cgi?id=12277 Testing would need to be performed to determine if the two issues are the same. This problem was introduced by the new request handling thread code ("NBD: allow nbd to be used locally", 3/2008), which entered into mainline around 2.6.25. The fix, which is fairly simple, is to restore the check for lo->sock being NULL in do_nbd_request. This causes I/O to an uninitialized nbd to immediately fail with an I/O error, as it did prior to the introduction of this bug. Signed-off-by: Paul Clements <paul.clements@steeleye.com> Reported-by: Jon Nelson <jnelson-kernel-bugzilla@jamponi.net> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: <stable@kernel.org> [2.6.26.x, 2.6.27.x, 2.6.28.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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| .. | ||
| aoe | ||
| paride | ||
| amiflop.c | ||
| ataflop.c | ||
| brd.c | ||
| cciss_cmd.h | ||
| cciss_scsi.c | ||
| cciss_scsi.h | ||
| cciss.c | ||
| cciss.h | ||
| cpqarray.c | ||
| cpqarray.h | ||
| cryptoloop.c | ||
| DAC960.c | ||
| DAC960.h | ||
| floppy.c | ||
| hd.c | ||
| ida_cmd.h | ||
| ida_ioctl.h | ||
| Kconfig | ||
| loop.c | ||
| Makefile | ||
| nbd.c | ||
| pktcdvd.c | ||
| ps3disk.c | ||
| smart1,2.h | ||
| sunvdc.c | ||
| swim3.c | ||
| sx8.c | ||
| ub.c | ||
| umem.c | ||
| umem.h | ||
| viodasd.c | ||
| virtio_blk.c | ||
| xd.c | ||
| xd.h | ||
| xen-blkfront.c | ||
| xsysace.c | ||
| z2ram.c | ||