2010/1/1 Jilles Tjoelker <[email protected]>: > On Fri, Jan 01, 2010 at 06:45:33PM +0100, Fernando Apesteguía wrote: >> Hi all, I post here cause I didn't get any answers in freebsd-emulation. > >> In 8.0-RELEASE-p1 if I try to execute this: > >> cat /compat/linux/proc/cpuinfo > ~/cpuinfo.txt > >> I get > >> cat: /compat/linux/proc/cpuinfo: Input/output error > >> truss shows the read system call returns ERR#5. It is the same with >> other files from linprocfs. > >> cat /compat/linux/proc/[any_file] works fine > >> What am I missing? > > You are not missing anything, this is a bug. A while ago, cat(1) was > changed to use larger buffers when writing to regular files on machines > with sufficient RAM, usually a multiple of MAXPHYS. On the other hand, > pseudofs (the general framework for filesystems such as procfs, > linprocfs and linsysfs) in src/sys/fs/pseudofs/pseudofs_vnops.c > pfs_read() fails any read over MAXPHYS + 1 with EIO. This limit probably > has to do with the allocation of a buffer of that size using sbuf_new(9) > (and so, malloc(9)). > > Some sort of limit seems appropriate, but MAXPHYS seems unrelated, and > if the request is too long it should perhaps just truncate it.
Thanks a lot for the explanation. > > -- > Jilles Tjoelker > _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
