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| author | Lars Ellenberg <lars.ellenberg@linbit.com> | 2011-02-21 13:21:03 +0100 |
|---|---|---|
| committer | Philipp Reisner <philipp.reisner@linbit.com> | 2011-10-14 16:47:46 +0200 |
| commit | 7ad651b52218eea3f9280dbb353dfe0c42742d85 (patch) | |
| tree | 52206f862eb6d1999252522e181d833673348ff7 /include | |
| parent | 46a15bc3ec425b546d140581c28192ab7877ddc4 (diff) | |
| download | linux-7ad651b52218eea3f9280dbb353dfe0c42742d85.tar.gz linux-7ad651b52218eea3f9280dbb353dfe0c42742d85.tar.bz2 linux-7ad651b52218eea3f9280dbb353dfe0c42742d85.zip | |
drbd: new on-disk activity log transaction format
Use a new on-disk transaction format for the activity log, which allows
for multiple changes to the active set per transaction.
Using 4k transaction blocks, we can now get rid of the work-around code
to deal with devices not supporting 512 byte logical block size.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/drbd.h | 4 | ||||
| -rw-r--r-- | include/linux/drbd_limits.h | 8 |
2 files changed, 9 insertions, 3 deletions
diff --git a/include/linux/drbd.h b/include/linux/drbd.h index 35fc08a0a552..70a688b92c1b 100644 --- a/include/linux/drbd.h +++ b/include/linux/drbd.h @@ -336,6 +336,10 @@ enum drbd_timeout_flag { #define DRBD_MAGIC 0x83740267 #define DRBD_MAGIC_BIG 0x835a +/* how I came up with this magic? + * base64 decode "actlog==" ;) */ +#define DRBD_AL_MAGIC 0x69cb65a2 + /* these are of type "int" */ #define DRBD_MD_INDEX_INTERNAL -1 #define DRBD_MD_INDEX_FLEX_EXT -2 diff --git a/include/linux/drbd_limits.h b/include/linux/drbd_limits.h index 447c36752385..75f05af33725 100644 --- a/include/linux/drbd_limits.h +++ b/include/linux/drbd_limits.h @@ -102,10 +102,12 @@ #define DRBD_RATE_DEF 250 /* kb/second */ /* less than 7 would hit performance unnecessarily. - * 3833 is the largest prime that still does fit - * into 64 sectors of activity log */ + * 919 slots context information per transaction, + * 32k activity log, 4k transaction size, + * one transaction in flight: + * 919 * 7 = 6433 */ #define DRBD_AL_EXTENTS_MIN 7 -#define DRBD_AL_EXTENTS_MAX 3833 +#define DRBD_AL_EXTENTS_MAX 6433 #define DRBD_AL_EXTENTS_DEF 127 #define DRBD_AFTER_MIN -1 |