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This patch is not needed after all. Implementing the sync_page method in the address_space operations using fs/buffer.c::block_sync_page() completely fixed the hangs I was seing with NTFS TNG. Best regards, Anton At 15:30 03/11/2001, Anton Altaparmakov wrote: >Linus, > >Please apply below patch for your next -pre kernel. > >This patch adds two disk request queue unplugs in mm/filemap.c which are >present in -ac kernels but not in -pre kernels. > >Without this patch NTFS TNG will hang when it tries to read anything using >the page cache. Same for BeFS as reported by Will Dyson. The hangs would >"unhang" as soon as something else caused disk io to happen (e.g. doing >md5sum on an ext2 partition on a file that hasn't been accessed before >so it isn't in the page cache yet). > >With this patch NTFS TNG no longer hangs. I haven't tried BeFS but I am >confident it will be fixed by this patch, too. > >Thanks go to Andrew Morton for locating the problem causing the hangs. > >Best regards, > > Anton >-- >Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @) >Linux NTFS maintainer / WWW: http://linux-ntfs.sf.net/ >ICQ: 8561279 / WWW: http://www-stu.christs.cam.ac.uk/~aia21/ > >--- linux-2.4.14-pre7-unplug.diff --- > >diff -u -urN linux-2.4.14-pre7-vanilla/mm/filemap.c >linux-2.4.14-pre7-aia1/mm/filemap.c >--- linux-2.4.14-pre7-vanilla/mm/filemap.c Sat Nov 3 12:17:55 2001 >+++ linux-2.4.14-pre7-aia1/mm/filemap.c Sat Nov 3 15:18:22 2001 >@@ -769,6 +769,7 @@ > if (!PageLocked(page)) > break; > sync_page(page); >+ run_task_queue(&tq_disk); > schedule(); > } while (PageLocked(page)); > tsk->state = TASK_RUNNING; >@@ -800,7 +801,9 @@ > set_task_state(tsk, TASK_UNINTERRUPTIBLE); > if (PageLocked(page)) { > sync_page(page); >+ run_task_queue(&tq_disk); > schedule(); >+ continue; > } > if (!TryLockPage(page)) > break; -- "I've not lost my mind. It's backed up on tape somewhere." - Unknown -- Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @) Linux NTFS Maintainer / WWW: http://linux-ntfs.sf.net/ ICQ: 8561279 / WWW: http://www-stu.christs.cam.ac.uk/~aia21/ - 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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