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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/lops.h
parent2f7ee358e5a0fedcb45c64bd83dad9dc9a212508 (diff)
downloadop-kernel-dev-e8c92ed769008cfc799497f0a34c8faf46243c4d.zip
op-kernel-dev-e8c92ed769008cfc799497f0a34c8faf46243c4d.tar.gz
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/lops.h')
-rw-r--r--fs/gfs2/lops.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/gfs2/lops.h b/fs/gfs2/lops.h
index 3c0b273..825356d 100644
--- a/fs/gfs2/lops.h
+++ b/fs/gfs2/lops.h
@@ -27,6 +27,8 @@ extern const struct gfs2_log_operations gfs2_rg_lops;
extern const struct gfs2_log_operations gfs2_databuf_lops;
extern const struct gfs2_log_operations *gfs2_log_ops[];
+extern void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page);
+extern void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int rw);
static inline unsigned int buf_limit(struct gfs2_sbd *sdp)
{
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