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1efdc45ea8
As described in flags section of open(2):
O_APPEND:
The file is opened in append mode. Before each write(2), the
file offset is positioned at the end of the file, as if with
lseek(2). O_APPEND may lead to corrupted files on NFS filesys-
tems if more than one process appends data to a file at once.
This is because NFS does not support appending to a file, so the
client kernel has to simulate it, which can't be done without a
race condition.
This issue was originally overlooked because normally the generic
VFS code handles this for a filesystem. However, because ZFS explictly
registers a zpl_write() function it's responsible for the seek.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3124
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