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author | phk <phk@FreeBSD.org> | 2004-09-05 21:15:58 +0000 |
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committer | phk <phk@FreeBSD.org> | 2004-09-05 21:15:58 +0000 |
commit | 38ae102f61e34fccf24c864f91b3f2560e50b18b (patch) | |
tree | 147fda4145293281b55787fc3a7e6af561de17f6 /sys/geom/notes | |
parent | 2087edb93832a47d6a043b58602f699b1b2967a4 (diff) | |
download | FreeBSD-src-38ae102f61e34fccf24c864f91b3f2560e50b18b.zip FreeBSD-src-38ae102f61e34fccf24c864f91b3f2560e50b18b.tar.gz |
For removable devices without media we set a zero mediasize but a non-zero
sectorsize in order to avoid a lot of checks around various divisions etc.
Enforce the sectorsize being > 0 with a KASSERT on successful open.
Fix scsi_cd.c to return 2k sectors when no media inserted.
Diffstat (limited to 'sys/geom/notes')
-rw-r--r-- | sys/geom/notes | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/sys/geom/notes b/sys/geom/notes index 3b0f811..4fcacae 100644 --- a/sys/geom/notes +++ b/sys/geom/notes @@ -138,3 +138,13 @@ application | | | | X | X | geom_slice.h is special in that it documents a "library" for implementing a specific kind of class, and consequently does not appear in the above matrix. +----------------------------------------------------------------------- +Removable media. + +In general, the theory is that a drive creates the provider when it has +a media and destroys it when the media disappears. + +In a more realistic world, we will allow a provider to be opened medialess +(set any sectorsize and a mediasize==0) in order to allow operations like +open/close tray etc. + |