path: root/fs/gfs2/inode.h
diff options
authorBenjamin Marzinski <bmarzins@redhat.com>2010-08-20 00:21:02 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2010-09-20 11:19:17 +0100
commit3921120e757f9167f3fcd3a1781239824471b14d (patch)
tree4b5f8e9e5376ae6a64b9757a62392b89a6316e26 /fs/gfs2/inode.h
parentGFS2: Add a bug trap in allocation code (diff)
GFS2: fallocate support
This patch adds support for fallocate to gfs2. Since the gfs2 does not support uninitialized data blocks, it must write out zeros to all the blocks. However, since it does not need to lock any pages to read from, gfs2 can write out the zero blocks much more efficiently. On a moderately full filesystem, fallocate works around 5 times faster on average. The fallocate call also allows gfs2 to add blocks to the file without changing the filesize, which will make it possible for gfs2 to preallocate space for the rindex file, so that gfs2 can grow a completely full filesystem. Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/inode.h')
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/gfs2/inode.h b/fs/gfs2/inode.h
index 15ff4df20aab..6720d7d5fbc6 100644
--- a/fs/gfs2/inode.h
+++ b/fs/gfs2/inode.h
@@ -19,6 +19,8 @@ extern int gfs2_releasepage(struct page *page, gfp_t gfp_mask);
extern int gfs2_internal_read(struct gfs2_inode *ip,
struct file_ra_state *ra_state,
char *buf, loff_t *pos, unsigned size);
+extern void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
+ unsigned int from, unsigned int to);
extern void gfs2_set_aops(struct inode *inode);
static inline int gfs2_is_stuffed(const struct gfs2_inode *ip)