[GFS2] Fix sign problem in quota/statfs and cleanup _host structures

This patch fixes some sign issues which were accidentally introduced
into the quota & statfs code during the endianess annotation process.
Also included is a general clean up which moves all of the _host
structures out of gfs2_ondisk.h (where they should not have been to
start with) and into the places where they are actually used (often only
one place). Also those _host structures which are not required any more
are removed entirely (which is the eventual plan for all of them).

The conversion routines from ondisk.c are also moved into the places
where they are actually used, which for almost every one, was just one
single place, so all those are now static functions. This also cleans up
the end of gfs2_ondisk.h which no longer needs the #ifdef __KERNEL__.

The net result is a reduction of about 100 lines of code, many functions
now marked static plus the bug fixes as mentioned above. For good
measure I ran the code through sparse after making these changes to
check that there are no warnings generated.

This fixes Red Hat bz #239686

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 58 insertions, 19 deletions

diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index faccffd1990..f916b9740c7 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -95,8 +95,8 @@ int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
 {
 	unsigned int x;
 
-	if (sb->sb_header.mh_magic != GFS2_MAGIC ||
-	    sb->sb_header.mh_type != GFS2_METATYPE_SB) {
+	if (sb->sb_magic != GFS2_MAGIC ||
+	    sb->sb_type != GFS2_METATYPE_SB) {
 		if (!silent)
 			printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
 		return -EINVAL;
@@ -174,10 +174,31 @@ static int end_bio_io_page(struct bio *bio, unsigned int bytes_done, int error)
 	return 0;
 }
 
+static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
+{
+	const struct gfs2_sb *str = buf;
+
+	sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
+	sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
+	sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
+	sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
+	sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
+	sb->sb_bsize = be32_to_cpu(str->sb_bsize);
+	sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
+	sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
+	sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
+	sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
+	sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
+
+	memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
+	memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
+}
+
 /**
  * gfs2_read_super - Read the gfs2 super block from disk
- * @sb: The VFS super block
+ * @sdp: The GFS2 super block
  * @sector: The location of the super block
+ * @error: The error code to return
  *
  * This uses the bio functions to read the super block from disk
  * because we want to be 100% sure that we never read cached data.
@@ -189,17 +210,19 @@ static int end_bio_io_page(struct bio *bio, unsigned int bytes_done, int error)
  * the master directory (contains pointers to journals etc) and the
  * root directory.
  *
- * Returns: A page containing the sb or NULL
+ * Returns: 0 on success or error
  */
 
-struct page *gfs2_read_super(struct super_block *sb, sector_t sector)
+int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
 {
+	struct super_block *sb = sdp->sd_vfs;
+	struct gfs2_sb *p;
 	struct page *page;
 	struct bio *bio;
 
 	page = alloc_page(GFP_KERNEL);
 	if (unlikely(!page))
-		return NULL;
+		return -ENOBUFS;
 
 	ClearPageUptodate(page);
 	ClearPageDirty(page);
@@ -208,7 +231,7 @@ struct page *gfs2_read_super(struct super_block *sb, sector_t sector)
 	bio = bio_alloc(GFP_KERNEL, 1);
 	if (unlikely(!bio)) {
 		__free_page(page);
-		return NULL;
+		return -ENOBUFS;
 	}
 
 	bio->bi_sector = sector * (sb->s_blocksize >> 9);
@@ -222,9 +245,13 @@ struct page *gfs2_read_super(struct super_block *sb, sector_t sector)
 	bio_put(bio);
 	if (!PageUptodate(page)) {
 		__free_page(page);
-		return NULL;
+		return -EIO;
 	}
-	return page;
+	p = kmap(page);
+	gfs2_sb_in(&sdp->sd_sb, p);
+	kunmap(page);
+	__free_page(page);
+	return 0;
 }
 
 /**
@@ -241,19 +268,13 @@ int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
 	u32 tmp_blocks;
 	unsigned int x;
 	int error;
-	struct page *page;
-	char *sb;
 
-	page = gfs2_read_super(sdp->sd_vfs, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
-	if (!page) {
+	error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
+	if (error) {
 		if (!silent)
 			fs_err(sdp, "can't read superblock\n");
-		return -EIO;
+		return error;
 	}
-	sb = kmap(page);
-	gfs2_sb_in(&sdp->sd_sb, sb);
-	kunmap(page);
-	__free_page(page);
 
 	error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 	if (error)
@@ -593,6 +614,24 @@ int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
 	return error;
 }
 
+static void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
+{
+	const struct gfs2_statfs_change *str = buf;
+
+	sc->sc_total = be64_to_cpu(str->sc_total);
+	sc->sc_free = be64_to_cpu(str->sc_free);
+	sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
+}
+
+static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
+{
+	struct gfs2_statfs_change *str = buf;
+
+	str->sc_total = cpu_to_be64(sc->sc_total);
+	str->sc_free = cpu_to_be64(sc->sc_free);
+	str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
+}
+
 int gfs2_statfs_init(struct gfs2_sbd *sdp)
 {
 	struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
@@ -772,7 +811,7 @@ static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
 			    struct gfs2_statfs_change_host *sc)
 {
 	gfs2_rgrp_verify(rgd);
-	sc->sc_total += rgd->rd_ri.ri_data;
+	sc->sc_total += rgd->rd_data;
 	sc->sc_free += rgd->rd_rg.rg_free;
 	sc->sc_dinodes += rgd->rd_rg.rg_dinodes;
 	return 0;