Rename
nbd_wr_syncv -> nbd_rwv
read_sync -> nbd_read
read_sync_eof -> nbd_read_eof
write_sync -> nbd_write
drop_sync -> nbd_drop
1. nbd_ prefix
read_sync and write_sync are already shared, so it is good to have a
namespace prefix. drop_sync will be shared, and read_sync_eof is
related to read_sync, so let's rename them all.
2. _sync suffix
_sync is related to the fact, that nbd_wr_syncv doesn't return if
write to socket returns EAGAIN. In first implementation nbd_wr_syncv
just loops while getting EAGAIN, current implementation yields in
this case.
Why to get rid of it:
- it is normal for r/w functions to be synchronous, so having
additional suffix for it looks redundant (contrariwise, we have
_aio suffix for async functions)
- _sync suffix in block layer is used when function does flush (so
using it for other thing is confusing a bit)
- keep function names short after adding nbd_ prefix
3. for nbd_wr_syncv let's use more common notation 'rw'
Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
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