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[REBASE/RESEND,4/4] block_int.h: Provide documentation for common block qdev properties

Message ID 06982c027a250c1f5c2df8286f12d9b2aca8103a.1296800130.git.amit.shah@redhat.com
State New
Headers show

Commit Message

Amit Shah Feb. 4, 2011, 6:18 a.m. UTC 
Document the options common to all block devices.

This comes from Kevin.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
---
 block_int.h |   20 ++++++++++++--------
 1 files changed, 12 insertions(+), 8 deletions(-)
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Patch

diff --git a/block_int.h b/block_int.h
index fdde005..2e72d1c 100644
--- a/block_int.h
+++ b/block_int.h
@@ -250,15 +250,19 @@  static inline unsigned int get_physical_block_exp(BlockConf *conf)
 }
 
 #define DEFINE_BLOCK_PROPERTIES(_state, _conf)                          \
-    DEFINE_PROP_DRIVE("drive", _state, _conf.bs, ""),                   \
-    DEFINE_PROP_UINT16("logical_block_size", _state,                    \
-                       _conf.logical_block_size, 512, ""),              \
+    DEFINE_PROP_DRIVE("drive", _state, _conf.bs, "The host drive details, specified by the -drive parameter"), \
+    DEFINE_PROP_UINT16("logical_block_size", _state, _conf.logical_block_size, \
+                       512, "Logical sector size of the disk"),         \
     DEFINE_PROP_UINT16("physical_block_size", _state,                   \
-                       _conf.physical_block_size, 512, ""),             \
-    DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0, ""), \
-    DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0, ""), \
-        DEFINE_PROP_INT32("bootindex", _state, _conf.bootindex, -1, ""), \
+                       _conf.physical_block_size, 512, "Physical sector size of the disk"), \
+    DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0,     \
+                       "Minimal size for IO requests in bytes. Must be a power of two that is 512 or greater."), \
+    DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0,     \
+                       "Size for IO requests that provides optimal performance (in bytes). Must be a power of two that is 512 or greater."),            \
+    DEFINE_PROP_INT32("bootindex", _state, _conf.bootindex, -1,         \
+                      "The index this device will be tried to boot from"), \
     DEFINE_PROP_UINT32("discard_granularity", _state, \
-                       _conf.discard_granularity, 0, "")
+                       _conf.discard_granularity, 0,  \
+                       "Number of free sectors needed to discard free blocks in a mapping image")
 
 #endif /* BLOCK_INT_H */