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Improve code documentation about "magnetic disk" storage manager.

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The modern incarnation of md.c is by no means specific to magnetic disk
technology, but every so often we hear from someone who's misled by the
label.  Try to clarify that it will work for anything that supports
standard filesystem operations.  Per suggestion from Andrew Dunstan.
This commit is contained in:
Tom Lane
2013-03-30 14:23:45 -04:00
parent 67eb3e5075
commit 22f7b9613e
2 changed files with 30 additions and 16 deletions
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7
src/backend/storage/smgr/md.c
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@@ -3,6 +3,13 @@
* md.c
* This code manages relations that reside on magnetic disk.
*
* Or at least, that was what the Berkeley folk had in mind when they named
* this file. In reality, what this code provides is an interface from
* the smgr API to Unix-like filesystem APIs, so it will work with any type
* of device for which the operating system provides filesystem support.
* It doesn't matter whether the bits are on spinning rust or some other
* storage technology.
*
* Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*