[PATCH] JFS: Support page sizes greater than 4K
jfs has never worked on architecutures where the page size was not 4K.
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/jfs/jfs_metapage.h b/fs/jfs/jfs_metapage.h
index 0e58aba..991e9fb 100644
--- a/fs/jfs/jfs_metapage.h
+++ b/fs/jfs/jfs_metapage.h
@@ -33,38 +33,27 @@
unsigned long flag; /* See Below */
unsigned long count; /* Reference count */
void *data; /* Data pointer */
-
- /* list management stuff */
- struct metapage *hash_prev;
- struct metapage *hash_next; /* Also used for free list */
-
- /*
- * mapping & index become redundant, but we need these here to
- * add the metapage to the hash before we have the real page
- */
- struct address_space *mapping;
- unsigned long index;
+ sector_t index; /* block address of page */
wait_queue_head_t wait;
/* implementation */
struct page *page;
- unsigned long logical_size;
+ unsigned int logical_size;
/* Journal management */
int clsn;
- atomic_t nohomeok;
+ int nohomeok;
struct jfs_log *log;
};
/* metapage flag */
#define META_locked 0
-#define META_absolute 1
-#define META_free 2
-#define META_dirty 3
-#define META_sync 4
-#define META_discard 5
-#define META_forced 6
-#define META_stale 7
+#define META_free 1
+#define META_dirty 2
+#define META_sync 3
+#define META_discard 4
+#define META_forcewrite 5
+#define META_io 6
#define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag)
@@ -80,7 +69,16 @@
__get_metapage(inode, lblock, size, absolute, TRUE)
extern void release_metapage(struct metapage *);
-extern void hold_metapage(struct metapage *, int);
+extern void grab_metapage(struct metapage *);
+extern void force_metapage(struct metapage *);
+
+/*
+ * hold_metapage and put_metapage are used in conjuction. The page lock
+ * is not dropped between the two, so no other threads can get or release
+ * the metapage
+ */
+extern void hold_metapage(struct metapage *);
+extern void put_metapage(struct metapage *);
static inline void write_metapage(struct metapage *mp)
{
@@ -101,6 +99,46 @@
release_metapage(mp);
}
+static inline void metapage_nohomeok(struct metapage *mp)
+{
+ struct page *page = mp->page;
+ lock_page(page);
+ if (!mp->nohomeok++) {
+ mark_metapage_dirty(mp);
+ page_cache_get(page);
+ wait_on_page_writeback(page);
+ }
+ unlock_page(page);
+}
+
+/*
+ * This serializes access to mp->lsn when metapages are added to logsynclist
+ * without setting nohomeok. i.e. updating imap & dmap
+ */
+static inline void metapage_wait_for_io(struct metapage *mp)
+{
+ if (test_bit(META_io, &mp->flag))
+ wait_on_page_writeback(mp->page);
+}
+
+/*
+ * This is called when already holding the metapage
+ */
+static inline void _metapage_homeok(struct metapage *mp)
+{
+ if (!--mp->nohomeok)
+ page_cache_release(mp->page);
+}
+
+static inline void metapage_homeok(struct metapage *mp)
+{
+ hold_metapage(mp);
+ _metapage_homeok(mp);
+ put_metapage(mp);
+}
+
+extern struct address_space_operations jfs_metapage_aops;
+
/*
* This routines invalidate all pages for an extent.
*/