Messages in this thread | | | Date | Fri, 4 Apr 2003 14:45:12 +0100 | From | Christoph Hellwig <> | Subject | Re: read actor |
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On Thu, Apr 03, 2003 at 04:14:05PM +0200, fcorneli@elis.ugent.be wrote: > Hi, > > 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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