https://gunkies.org/index.php?action=history&feed=atom&title=Talk%3ARepairing_early_UNIX_file_systemsTalk:Repairing early UNIX file systems - Revision history2026-05-09T02:32:00ZRevision history for this page on the wikiMediaWiki 1.30.1https://gunkies.org/w/index.php?title=Talk:Repairing_early_UNIX_file_systems&diff=28833&oldid=prevJnc: /* More history */ PWB does indeed not support 'huge' files2023-03-08T10:50:13Z<p><span dir="auto"><span class="autocomment">More history: </span> PWB does indeed not support 'huge' files</span></p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 10:50, 8 March 2023</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[User:Jnc|Jnc]] ([[User talk:Jnc|talk]]) 15:46, 7 March 2023 (CET)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[User:Jnc|Jnc]] ([[User talk:Jnc|talk]]) 15:46, 7 March 2023 (CET)</div></td></tr>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">: This removal of support for 'huge' files appears to be correct. If one compares bmap() in PWB1'S [https://minnie.tuhs.org/cgi-bin/utree.pl?file=PWB1/sys/sys/os/subr.c subr.c] with [https://minnie.tuhs.org/cgi-bin/utree.pl?file=V6/usr/sys/ken/subr.c V6]'s, the "'huge' fetch of double indirect block" code has been removed. I guess PWB didn't need very large (> 8*256*512 = 1,048,576 bytes) files? [[User:Jnc|Jnc]] ([[User talk:Jnc|talk]]) 11:49, 8 March 2023 (CET)</ins></div></td></tr>
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</table>Jnchttps://gunkies.org/w/index.php?title=Talk:Repairing_early_UNIX_file_systems&diff=28821&oldid=prevJnc: More history2023-03-07T14:46:42Z<p>More history</p>
<p><b>New page</b></p><div>==More history==<br />
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From [https://groups.google.com/g/net.unix/c/-H9x36DMOBQ/m/4mcL76lKbmMJ?pli=1 here] by Guy Harris, Jan 15, 1984:<br />
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: ''Hal Pierson .. mentioned that ... "craftsmen" (which I think is AT&Tese for "field engineer") ... wouldn't know an inode if it came up and bit them in the *ss, so they had to replace "icheck" and "dcheck" with a new program which would do most of the dirty work of file system repair for them - Hal wrote one called "fcheck", which cleaned V6 file systems, and which appeared in source-code form on the PWB/UNIX 1.0 distribution tape. Unfortunately, PWB/UNIX 1.0 modified the V6 file system so that it didn't support "huge" files, and the eighth indirect pointer pointed directly to a block as the other seven did, so the "fcheck" there wouldn't fix a vanilla PWB/UNIX file system, but it worked just fine on a vanilla V6 FS. When I discovered it, quite by accident, I looked at it and it sure looked like a super-duper file system fixer; once we got it up, we never went back to "icheck" and "dcheck" again. Later on, of course, Ted Kowalski rewrote it to work on a V7 filesystem, added some extra checks, gave it the ability to reconnect files with no directory entries, put comments into the code (something Hal still has trouble doing :-)), cleaned it up some, and renamed it "fsck".''<br />
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[[User:Jnc|Jnc]] ([[User talk:Jnc|talk]]) 15:46, 7 March 2023 (CET)</div>Jnc