Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / jfs / jfs_metapage.h

diff --git a/kernel/fs/jfs/jfs_metapage.h b/kernel/fs/jfs/jfs_metapage.h
new file mode 100644 (file)
index 0000000..337e9e5
--- /dev/null
+++ b/kernel/fs/jfs/jfs_metapage.h
@@ -0,0 +1,154 @@
+/*
+ *   Copyright (C) International Business Machines Corp., 2000-2002
+ *   Portions Copyright (C) Christoph Hellwig, 2001-2002
+ *
+ *   This program is free software;  you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ *   the GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program;  if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#ifndef        _H_JFS_METAPAGE
+#define _H_JFS_METAPAGE
+
+#include <linux/pagemap.h>
+
+struct metapage {
+       /* Common logsyncblk prefix (see jfs_logmgr.h) */
+       u16 xflag;
+       u16 unused;
+       lid_t lid;
+       int lsn;
+       struct list_head synclist;
+       /* End of logsyncblk prefix */
+
+       unsigned long flag;     /* See Below */
+       unsigned long count;    /* Reference count */
+       void *data;             /* Data pointer */
+       sector_t index;         /* block address of page */
+       wait_queue_head_t wait;
+
+       /* implementation */
+       struct page *page;
+       unsigned int logical_size;
+
+       /* Journal management */
+       int clsn;
+       int nohomeok;
+       struct jfs_log *log;
+};
+
+/* metapage flag */
+#define META_locked    0
+#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)
+
+/* function prototypes */
+extern int metapage_init(void);
+extern void metapage_exit(void);
+extern struct metapage *__get_metapage(struct inode *inode,
+                                 unsigned long lblock, unsigned int size,
+                                 int absolute, unsigned long new);
+
+#define read_metapage(inode, lblock, size, absolute)\
+        __get_metapage(inode, lblock, size, absolute, false)
+
+#define get_metapage(inode, lblock, size, absolute)\
+        __get_metapage(inode, lblock, size, absolute, true)
+
+extern void release_metapage(struct metapage *);
+extern void grab_metapage(struct metapage *);
+extern void force_metapage(struct metapage *);
+
+/*
+ * hold_metapage and put_metapage are used in conjunction.  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)
+{
+       set_bit(META_dirty, &mp->flag);
+       release_metapage(mp);
+}
+
+static inline void flush_metapage(struct metapage *mp)
+{
+       set_bit(META_sync, &mp->flag);
+       write_metapage(mp);
+}
+
+static inline void discard_metapage(struct metapage *mp)
+{
+       clear_bit(META_dirty, &mp->flag);
+       set_bit(META_discard, &mp->flag);
+       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 const struct address_space_operations jfs_metapage_aops;
+
+/*
+ * This routines invalidate all pages for an extent.
+ */
+extern void __invalidate_metapages(struct inode *, s64, int);
+#define invalidate_pxd_metapages(ip, pxd) \
+       __invalidate_metapages((ip), addressPXD(&(pxd)), lengthPXD(&(pxd)))
+#define invalidate_dxd_metapages(ip, dxd) \
+       __invalidate_metapages((ip), addressDXD(&(dxd)), lengthDXD(&(dxd)))
+#define invalidate_xad_metapages(ip, xad) \
+       __invalidate_metapages((ip), addressXAD(&(xad)), lengthXAD(&(xad)))
+
+#endif                         /* _H_JFS_METAPAGE */