On Mon, Aug 11, 2014 at 9:14 PM, Emmanuel Dreyfus <manu@xxxxxxxxxx> wrote:
Anand Avati <avati@xxxxxxxxxxx> wrote:I found the code in the kernel that skips the read if it is beyond known
> In meta all file sizes are 0 (since the contents of the inode are generated
> dynamically on open()/read(), size is unknown during lookup() -- just like
> /proc). And therefore all meta file open()s are forced into direct_io_mode (
> http://review.gluster.org/7506) so that read() requests are sent straight
> to FUSE/glusterfs bypassing VFS (size is ignored etc.)
file size. Hence I guess the idea is that on lookup of a file with a
size equal to 0, a special handling should be done so that reads happens
anyway.
If FUSE implements proper direct_io semantics (somewhat like how O_DIRECT flag is handled) and allows the mode to be enabled by the FS in open_cbk, then I guess such a special handling of 0-byte need not be necessary? At least it hasn't been necessary in Linux FUSE implementation.
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