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5082fc82a6
NBD reconnect logic considers the error code from the functions that
read NBD messages to tell if reconnect should be attempted or not: it is
attempted on -EIO, otherwise the client transitions to NBD_CLIENT_QUIT
state (see nbd_channel_error). This error code is propagated from the
primitives like nbd_read.
The problem, however, is that nbd_read itself turns every error into -1
rather than -EIO. As a result, if the NBD server happens to die while
sending the message, the client in QEMU receives less data than it
expects, considers it as a fatal error, and wouldn't attempt
reestablishing the connection.
Fix it by turning every negative return from qio_channel_read_all into
-EIO returned from nbd_read. Apparently that was the original behavior,
but got broken later. Also adjust nbd_readXX to follow.
Fixes:
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.. | ||
accounting.h | ||
aio_task.h | ||
aio-wait.h | ||
aio.h | ||
block_backup.h | ||
block_int.h | ||
block-copy.h | ||
block-hmp-cmds.h | ||
block.h | ||
blockjob_int.h | ||
blockjob.h | ||
dirty-bitmap.h | ||
export.h | ||
fuse.h | ||
nbd.h | ||
nvme.h | ||
qapi.h | ||
qdict.h | ||
raw-aio.h | ||
snapshot.h | ||
thread-pool.h | ||
throttle-groups.h | ||
write-threshold.h |