freebsd kernel with SKQ
445193b887
the directory's inode after queuing the dirrem that will decrement the parent directory's link count. This will force the update of the parent directory's actual link to actually be scheduled. Without this change the parent directory's actual link count would not be updated until ufs_inactive() cleared the inode of the newly removed directory, which might be deferred indefinitely. ufs_inactive() will not be called as long as any process holds a reference to the removed directory, and ufs_inactive() will not clear the inode if the link count is non-zero, which could be the result of an earlier system crash. If a background fsck is run before the update of the parent directory's actual link count has been performed, or at least scheduled by putting the dirrem on the leaf directory's inodedep id_bufwait list, fsck will corrupt the file system by decrementing the parent directory's effective link count, which was previously correct because it already took the removal of the leaf directory into account, and setting the actual link count to the same value as the effective link count after the dangling, removed, leaf directory has been removed. This happens because fsck acts based on the actual link count, which will be too high when fsck creates the file system snapshot that it references. This change has the fortunate side effect of more quickly cleaning up the large number dirrem structures that linger for an extended time after the removal of a large directory tree. It also fixes a potential problem with the shutdown of the syncer thread timing out if the system is rebooted immediately after removing a large directory tree. Submitted by: tegge MFC after: 3 days |
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| bin | ||
| contrib | ||
| crypto | ||
| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| ObsoleteFiles.inc | ||
| 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/doc/en_US.ISO8859-1/books/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 might need to build world before. More information is available in the handbook. The sample kernel configuration files reside in the sys/<arch>/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. kerberos5 Kerberos5 (Heimdal) 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/doc/en_US.ISO8859-1/books/handbook/synching.html