Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | Date | Thu, 9 Oct 2003 11:04:56 +0530 | From | Suparna Bhattacharya <> | Subject | [PATCH][2.6-mm] Fix AIO and 4G-4G hang |
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This patch appears to fix the hangs seen with AIO and 4G-4G for me. It ensures that the indirect versions of copy_xxx_user are used during aio retries running in worker thread context (i.e. access aio issuer's user-space instead of kernel-space).
Regards Suparna -- Suparna Bhattacharya (suparna@in.ibm.com) Linux Technology Center IBM Software Labs, India
------------------------------------------------------- diffstat aio-4g4g-fix.patch
aio.c | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletion(-)
--- 260t5mm2/fs/aio.c Fri Sep 19 15:15:39 2003 +++ linux-2.6.0-test5-mm4/fs/aio.c Tue Oct 7 23:40:22 2003 @@ -805,18 +814,23 @@ static inline void aio_run_iocbs(struct * aio_kick_handler: * Work queue handler triggered to process pending * retries on an ioctx. Takes on the aio issuer's - * mm context before running the iocbs. + * mm context before running the iocbs, so that + * copy_xxx_user operates on the issuer's address + * space. * Run on aiod's context. */ static void aio_kick_handler(void *data) { struct kioctx *ctx = data; + mm_segment_t oldfs = get_fs(); + set_fs(USER_DS); use_mm(ctx->mm); spin_lock_irq(&ctx->ctx_lock); __aio_run_iocbs(ctx); unuse_mm(ctx->mm); spin_unlock_irq(&ctx->ctx_lock); + set_fs(oldfs); } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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