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authorDave Kleikamp <shaggy@austin.ibm.com>2005-05-02 14:25:02 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-03 01:23:53 -0400
commit7fab479bebb96b1b4888bdae9b42e1fa9c5d3f38 (patch)
tree3d47de90cf39002e576df02f474bc17342ff0f4a /fs/jfs/jfs_metapage.h
parentdc5798d9a7b656550533a5c0177dba17d4ef4990 (diff)
[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>
Diffstat (limited to 'fs/jfs/jfs_metapage.h')
-rw-r--r--fs/jfs/jfs_metapage.h80
1 files changed, 59 insertions, 21 deletions
diff --git a/fs/jfs/jfs_metapage.h b/fs/jfs/jfs_metapage.h
index 0e58aba58c37..991e9fb84c75 100644
--- a/fs/jfs/jfs_metapage.h
+++ b/fs/jfs/jfs_metapage.h
@@ -33,38 +33,27 @@ struct metapage {
33 unsigned long flag; /* See Below */ 33 unsigned long flag; /* See Below */
34 unsigned long count; /* Reference count */ 34 unsigned long count; /* Reference count */
35 void *data; /* Data pointer */ 35 void *data; /* Data pointer */
36 36 sector_t index; /* block address of page */
37 /* list management stuff */
38 struct metapage *hash_prev;
39 struct metapage *hash_next; /* Also used for free list */
40
41 /*
42 * mapping & index become redundant, but we need these here to
43 * add the metapage to the hash before we have the real page
44 */
45 struct address_space *mapping;
46 unsigned long index;
47 wait_queue_head_t wait; 37 wait_queue_head_t wait;
48 38
49 /* implementation */ 39 /* implementation */
50 struct page *page; 40 struct page *page;
51 unsigned long logical_size; 41 unsigned int logical_size;
52 42
53 /* Journal management */ 43 /* Journal management */
54 int clsn; 44 int clsn;
55 atomic_t nohomeok; 45 int nohomeok;
56 struct jfs_log *log; 46 struct jfs_log *log;
57}; 47};
58 48
59/* metapage flag */ 49/* metapage flag */
60#define META_locked 0 50#define META_locked 0
61#define META_absolute 1 51#define META_free 1
62#define META_free 2 52#define META_dirty 2
63#define META_dirty 3 53#define META_sync 3
64#define META_sync 4 54#define META_discard 4
65#define META_discard 5 55#define META_forcewrite 5
66#define META_forced 6 56#define META_io 6
67#define META_stale 7
68 57
69#define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag) 58#define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag)
70 59
@@ -80,7 +69,16 @@ extern struct metapage *__get_metapage(struct inode *inode,
80 __get_metapage(inode, lblock, size, absolute, TRUE) 69 __get_metapage(inode, lblock, size, absolute, TRUE)
81 70
82extern void release_metapage(struct metapage *); 71extern void release_metapage(struct metapage *);
83extern void hold_metapage(struct metapage *, int); 72extern void grab_metapage(struct metapage *);
73extern void force_metapage(struct metapage *);
74
75/*
76 * hold_metapage and put_metapage are used in conjuction. The page lock
77 * is not dropped between the two, so no other threads can get or release
78 * the metapage
79 */
80extern void hold_metapage(struct metapage *);
81extern void put_metapage(struct metapage *);
84 82
85static inline void write_metapage(struct metapage *mp) 83static inline void write_metapage(struct metapage *mp)
86{ 84{
@@ -101,6 +99,46 @@ static inline void discard_metapage(struct metapage *mp)
101 release_metapage(mp); 99 release_metapage(mp);
102} 100}
103 101
102static inline void metapage_nohomeok(struct metapage *mp)
103{
104 struct page *page = mp->page;
105 lock_page(page);
106 if (!mp->nohomeok++) {
107 mark_metapage_dirty(mp);
108 page_cache_get(page);
109 wait_on_page_writeback(page);
110 }
111 unlock_page(page);
112}
113
114/*
115 * This serializes access to mp->lsn when metapages are added to logsynclist
116 * without setting nohomeok. i.e. updating imap & dmap
117 */
118static inline void metapage_wait_for_io(struct metapage *mp)
119{
120 if (test_bit(META_io, &mp->flag))
121 wait_on_page_writeback(mp->page);
122}
123
124/*
125 * This is called when already holding the metapage
126 */
127static inline void _metapage_homeok(struct metapage *mp)
128{
129 if (!--mp->nohomeok)
130 page_cache_release(mp->page);
131}
132
133static inline void metapage_homeok(struct metapage *mp)
134{
135 hold_metapage(mp);
136 _metapage_homeok(mp);
137 put_metapage(mp);
138}
139
140extern struct address_space_operations jfs_metapage_aops;
141
104/* 142/*
105 * This routines invalidate all pages for an extent. 143 * This routines invalidate all pages for an extent.
106 */ 144 */