Patch 1067 : append mode does not work on cachefs : [IRIX 5.3]
INDEX
RELATIONS
RELEASE NOTES
1. Patch SG0001067 Release Note This release note describes patch SG0001067 to IRIX ONC3 5.3.1.1 Supported Hardware Platforms This patch contains bug fixes for all hardware and software configurations. The software cannot be installed on other configurations.1.2 Supported Software Platforms This patch contains bug fixes for all hardware and software configurations. The software cannot be installed on other configurations.1.3 Bugs Fixed by Patch SG0001067 This patch contains fixes for the following bugs in IRIX ONC3 5.3. Bug numbers from Silicon Graphics bug tracking system are included for reference. o Bug report 314341 -- ls dumps core For large directories supplied by IRIX 5.3 servers and mounted via cachefs, ls on the client will dump core. This is because getdents(2) returns an offset for the next entry which causes a loop. Cachefs takes the offsets for the directory entries from what is supplied by the back file system with no modification. It assumes, however, that the offsets in the directory entries (d_off) are strictly increasing. This turns out to not be true for some file systems on IRIX 5.3. It has been observed that XFS file systems supply directory entries whose offsets are not ordered. The fix for this alters how the directory data is cached. Thus, the fix will not take effect until existing cached data is replaced. It is advised that existing caches be purged after installing this patch. o Bug reports 309941 and 253566 -- Filesize limit exceeded when using cachefs When writing through a cachefs file system with an underlying xfs partition, the command terminates with a "Filesize limit exceeded" error. o Bug report 252778 -- high load average Due to a deadlock which can occur when a cachefs async daemon calls VOP_FSYNC with the FSYNC_WAIT flag, cachefs may hang during a sync operation. o Bug report 259761 -- cachefs hangs in sync Due to a deadlock which can occur when cachefs_fsync is called with the FSYNC_WAIT flag, cachefs may hang during a sync operation. o Bug report 252778 -- excessive memory use by cachefs CacheFS excessively allocates kernel memory. Much of the memory allocated is not returned to the system until all CacheFS file systems have been unmounted. This patch changes CacheFS so that it will return memory to the system by freeing cnode data. This may be controlled through two tunable parameters: maxcnodes and cachefs_max_lru. The tunable parameter maxcnodes has been introduced with this patch. It determines the upper bound for cnode allocation. This is what might be called a "soft" boundary. CacheFS may allocate more than this many cnodes, but once the upper bound has been exceeded, inactive cnodes will be freed. Tuning should be done by setting maxcnodes and cachefs_max_lru to low values (such as 100 and 10 respectively), with maxcnodes being greater than cachefs_max_lru. These numbers should be increased until the desired combination of performance and memory usage is obtained. Note that maxcnodes may be set to be less than or equal to cachefs_max_lru. Doing so will cause no problems. It will, however, result in all cnodes not on the lru list being freed (i.e., their storage returned to the system). Take care to consider file access patterns when tuning. Commands such as du(1) and find(1) will have very different access patterns from make(1), cc(1) and ld(1). The above tuning method has been suggested in order that fragmentation of the kernel heap may be avoided. This will minimize both the total memory allocated to the kernel and the amount used by CacheFS. Setting maxcnodes and cachefs_max_lru to higher values and then lowering them is less effective at keeping kernel memory usage low. This is because the data allocated by CacheFS will be distributed throughout a larger heap area. o Bug report 327389 -- append mode does not work on cachefs When using ksh or tsch to append (>>) data to a cachefs mounted file, the data is appended to the beginning of the file. sh and csh append ok.1.4 Subsystems Included in Patch SG0001067 This patch release includes these subsystems: o patchSG0001067.onc3_eoe_sw.cachefs1.5 Installation Instructions Because you want to install only the patches for problems you have encountered, patch software is not installed by default. After reading the descriptions of the bugs fixed in this patch (see Section 1.3), determine the patches that meet your specific needs. If, after reading Sections 1.1 and 1.2 of these release notes, you are unsure whether your hardware and software meet the requirements for installing a particular patch, run inst. Patch software is installed like any other Silicon Graphics software product. Follow the instructions in your Software Installation Administrator's Guide to bring up the miniroot form of the software installation tools. Follow these steps to select a patch for installation: 1. At the Inst>prompt, type install patchSGxxxxxxx where xxxxxxx is the patch number. 2. Select the desired patches for installation. 3. Initiate the installation sequence. Type Inst> go 4. You may find that two patches have been marked as incompatible. If this occurs, you must deselect one of the patches. Inst> keep patchSGxxxxxxx where xxxxxxx is the patch number. 5. After completing the installation process, exit the inst program by typing Inst> quit To remove a patch, use the versions remove command as you would for any other software subsystem. The removal process reinstates the original version of software unless you have specifically removed the patch history from your system. versions remove patchSGxxxxxxx where xxxxxxx is the patch number. To keep a patch but increase your disk space, use the versions removehist command to remove the patch history. versions removehist patchSGxxxxxxx where xxxxxxx is the patch number. INST SUBSYSTEM REQUIREMENTS No Requirements Information Available. INST SUBSYSTEM CHECKSUMS These checksums help to provide a 'signature' for the patch inst image which can be used to authenticate other inst images. You can obtain this kind of output by running sum -r on the image (from the command line): 30170 2 patchSG0001067 05476 5 patchSG0001067.idb 52545 1535 patchSG0001067.onc3_eoe_sw INST SUBSYSTEM FILE LISTINGS The following lists the files which get installed from each subsystem in the patch:
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Document Id: 20021117063343-IRIXPatch-938
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