diff options
| author | Thomas Schwinge <tschwinge@gnu.org> | 2009-05-20 10:49:07 +0200 |
|---|---|---|
| committer | Thomas Schwinge <tschwinge@gnu.org> | 2009-05-20 10:49:07 +0200 |
| commit | f90c5b8e926cad2bd21e93c523be5a1776e11796 (patch) | |
| tree | 8b184df0904c50a7cdfde98781b4bb8af8a4097e /hurd/libstore/zero_store.mdwn | |
| parent | ca4f4b137695e989666ddc7d5344d8d07532ec54 (diff) | |
Text from a 2000-12-21 email by Roland McGrath.
Message-Id: <200012210724.eBL7OHv09671@neuralgia.linnaean.org>
Diffstat (limited to 'hurd/libstore/zero_store.mdwn')
| -rw-r--r-- | hurd/libstore/zero_store.mdwn | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/hurd/libstore/zero_store.mdwn b/hurd/libstore/zero_store.mdwn index 120847ba..4c53ab56 100644 --- a/hurd/libstore/zero_store.mdwn +++ b/hurd/libstore/zero_store.mdwn @@ -1,4 +1,4 @@ -[[!meta copyright="Copyright © 2007, 2008, 2009 Free Software Foundation, +[[!meta copyright="Copyright © 2000, 2007, 2008, 2009 Free Software Foundation, Inc."]] [[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable @@ -10,3 +10,10 @@ is included in the section entitled [[GNU Free Documentation License|/fdl]]."]]"""]] [[!meta title="zero store: empty block device"]] + +A *zero* store is what `/dev/zero` is (always reads zeros), the setting on +`/dev/zero` gives no name (i.e. size) and the default size is the maximum +possible. The only meaning of the size of a *zero* is what `st_size` will +report and what offsets it will let you try to read or write from--there is +never any data associated with a *zero* store. (The code for this is in +`libstore/zero.c`.) |