freebsd with flexible iflib nic queues
fc89704c57
With the recent changes in the CAM error handling, some problems in the error handling of sa(4) have been uncovered. Basically, a number of conditions that are not actually errors have been mistreated as genuine errors. In particular: . Trying to read in variable length mode with a mismatched blocksize between the on-tape (virtual) blocks and the read(2) supplied buffer size, causing an ILI SCSI condition, have caused an attempt to retry the supposedly `errored' transfer, causing the tape to be read continuously until it eventually hit EOM. Since by default any simple mt(1) operation does an initial test read, an `mt stat' was sufficient to trigger this bug. Note that it's Justin's opinion that treating a NO SENSE as an EIO is another bug in CAM. I feel not authorized to fix cam_periph.c without another confirmation that i'm on the right track, however. . Hitting a filemark caused the read(2) syscall to return EIO, instead of returning a `short read'. Note that the current fix only solves this problem in variable length mode. Fixed length mode uses a different code path, and since i didn't grok all the intentions behind that handling, i did not touch it (IOW: it's still broken, and you get an EIO upon hitting a filemark). The solution is to keep track of those conditions inside saerror(), and upon completion to not call cam_periph_error() in that case. We need to make sure that the device gets unfrozen if needed though (in case of actual errors, cam_periph_error() does this on our behalf). Not objected by: mjacob (who currently doesn't have the time to review the patch) |
||
|---|---|---|
| bin | ||
| contrib | ||
| crypto | ||
| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| kerberosIV | ||
| lib | ||
| libexec | ||
| release | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| COPYRIGHT | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.upgrade | ||
| README | ||
| UPDATING | ||
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel, the kernel-modules and the contents of /etc. The ``buildkernel'' and ``installkernel'' targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/handbook/kernelconfig.html And in the config(8) man page. Note: If you want to build and install the kernel with the ``buildkernel'' and ``installkernel'' targets, you have to build world before. More information is available in the handbook. The sample kernel configuration files reside in the sys/i386/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file NOTES contains entries and documentation for all possible devices, not just those commonly used. It is the successor of the ancient LINT file, but in contrast to LINT, it is not buildable as a kernel but a pure reference and documentation file. Source Roadmap: --------------- bin System/User commands. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberosIV Kerberos package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/handbook/synching.html