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| author | Kristen Carlson Accardi <kristen.c.accardi@intel.com> | 2007-05-23 13:57:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-23 20:14:11 -0700 |
| commit | 86ce18d7b7925bfd6b64c061828ca2a857ee83b8 (patch) | |
| tree | b753b7fd6d195aa7ed9eebc5a3917c5f20786260 /Documentation/block/capability.txt | |
| parent | 352823160613b65fdaa558be486720a71f75ed86 (diff) | |
| download | linux-86ce18d7b7925bfd6b64c061828ca2a857ee83b8.tar.gz linux-86ce18d7b7925bfd6b64c061828ca2a857ee83b8.tar.bz2 linux-86ce18d7b7925bfd6b64c061828ca2a857ee83b8.zip | |
genhd: expose AN to user space
Allow user space to determine if a disk supports Asynchronous Notification of
media changes. This is done by adding a new sysfs file "capability_flags",
which is documented in (insert file name). This sysfs file will export all
disk capabilities flags to user space. We also define a new flag to define
the media change notification capability.
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/block/capability.txt')
| -rw-r--r-- | Documentation/block/capability.txt | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/block/capability.txt b/Documentation/block/capability.txt new file mode 100644 index 000000000000..2f1729424ef4 --- /dev/null +++ b/Documentation/block/capability.txt @@ -0,0 +1,15 @@ +Generic Block Device Capability +=============================================================================== +This file documents the sysfs file block/<disk>/capability + +capability is a hex word indicating which capabilities a specific disk +supports. For more information on bits not listed here, see +include/linux/genhd.h + +Capability Value +------------------------------------------------------------------------------- +GENHD_FL_MEDIA_CHANGE_NOTIFY 4 + When this bit is set, the disk supports Asynchronous Notification + of media change events. These events will be broadcast to user + space via kernel uevent. + |