Re: read actor
Christoph Hellwig (email@example.com)
Fri, 4 Apr 2003 14:45:12 +0100
On Thu, Apr 03, 2003 at 04:14:05PM +0200, firstname.lastname@example.org wrote:
> When one uses do_generic_file_read to (in-kernel) read a file from the
> page cache one has to give a read_actor as parameter. Suppose different
> do_generic_file_read instances occur simultaneously, then how can a
> shared file_read_actor differentiate between the different
> do_generic_file_read instances that made a call to it?
> Shouldn't read_descriptor_t contain something like
> void *this_data;
> to make this possible?
do_generic_file_read is not an interface you are supposed to use, and any use
of it will lead to subtile races with filesystems that use the pagecache
but not plain generic_file_read. See the ->sendfile operation in 2.5
for a proper fix.
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