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authorSteven Whitehouse <swhiteho@redhat.com>2012-04-16 09:28:31 +0100
committerSteven Whitehouse <swhiteho@redhat.com>2012-04-24 16:44:34 +0100
commite8c92ed769008cfc799497f0a34c8faf46243c4d (patch)
tree6e00d9ddfd7d02ac9b1ac50d99de946d42443922 /fs/gfs2/incore.h
parent2f7ee358e5a0fedcb45c64bd83dad9dc9a212508 (diff)
GFS2: Clean up log write code path
Prior to this patch, we have two ways of sending i/o to the log. One of those is used when we need to allocate both the data to be written itself and also a buffer head to submit it. This is done via sb_getblk and friends. This is used mostly for writing log headers. The other method is used when writing blocks which have some in-place counterpart. This is the case for all the metadata blocks which are journalled, and when journaled data is in use, for unescaped journalled data blocks. This patch replaces both of those two methods, and about half a dozen separate i/o submission points with a single i/o submission function. We also go direct to bio rather than using buffer heads, since this allows us to build i/o requests of the maximum size for the block device in question. It also reduces the memory required for flushing the log, which can be very useful in low memory situations. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/incore.h')
-rw-r--r--fs/gfs2/incore.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 47d0bda5ac2b..dd97f64a8bd4 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -716,7 +716,9 @@ struct gfs2_sbd {
struct rw_semaphore sd_log_flush_lock;
atomic_t sd_log_in_flight;
+ struct bio *sd_log_bio;
wait_queue_head_t sd_log_flush_wait;
+ int sd_log_error;
unsigned int sd_log_flush_head;
u64 sd_log_flush_wrapped;