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Diffstat (limited to 'hurd/libstore/zero_store.mdwn')
| -rw-r--r-- | hurd/libstore/zero_store.mdwn | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/hurd/libstore/zero_store.mdwn b/hurd/libstore/zero_store.mdwn new file mode 100644 index 00000000..4c53ab56 --- /dev/null +++ b/hurd/libstore/zero_store.mdwn @@ -0,0 +1,19 @@ +[[!meta copyright="Copyright © 2000, 2007, 2008, 2009 Free Software Foundation, +Inc."]] + +[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable +id="license" text="Permission is granted to copy, distribute and/or modify this +document under the terms of the GNU Free Documentation License, Version 1.2 or +any later version published by the Free Software Foundation; with no Invariant +Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license +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`.) |