[PATCH] JFS: Changes for larger page size

JFS code has always assumed a page size of 4K.  This patch fixes the
non-pagecache uses of pages to deal with larger pages.

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 39 insertions, 28 deletions

diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index e357890adfb2..453bace608d1 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -3181,7 +3181,7 @@ int jfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
                         d = (struct ldtentry *) & p->slot[stbl[i]];
 
                         if (((long) jfs_dirent + d->namlen + 1) >
-                            (dirent_buf + PSIZE)) {
+                            (dirent_buf + PAGE_SIZE)) {
                                 /* DBCS codepages could overrun dirent_buf */
                                 index = i;
                                 overflow = 1;
diff --git a/fs/jfs/jfs_logmgr.c b/fs/jfs/jfs_logmgr.c
index b6a6869ebb4f..e0f867ddfd10 100644
--- a/fs/jfs/jfs_logmgr.c
+++ b/fs/jfs/jfs_logmgr.c
@@ -1669,6 +1669,7 @@ int lmLogShutdown(struct jfs_log * log)
         lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor);
         lbmWrite(log, log->bp, lbmWRITE | lbmRELEASE | lbmSYNC, 0);
         lbmIOWait(log->bp, lbmFREE);
+        log->bp = NULL;
 
         /*
          * synchronous update log superblock
@@ -1819,20 +1820,34 @@ static int lbmLogInit(struct jfs_log * log)
 
         log->lbuf_free = NULL;
 
-        for (i = 0; i < LOGPAGES; i++) {
-                lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL);
-                if (lbuf == 0)
-                        goto error;
-                lbuf->l_ldata = (char *) get_zeroed_page(GFP_KERNEL);
-                if (lbuf->l_ldata == 0) {
-                        kfree(lbuf);
+        for (i = 0; i < LOGPAGES;) {
+                char *buffer;
+                uint offset;
+                struct page *page;
+
+                buffer = (char *) get_zeroed_page(GFP_KERNEL);
+                if (buffer == NULL)
                         goto error;
+                page = virt_to_page(buffer);
+                for (offset = 0; offset < PAGE_SIZE; offset += LOGPSIZE) {
+                        lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL);
+                        if (lbuf == NULL) {
+                                if (offset == 0)
+                                        free_page((unsigned long) buffer);
+                                goto error;
+                        }
+                        if (offset) /* we already have one reference */
+                                get_page(page);
+                        lbuf->l_offset = offset;
+                        lbuf->l_ldata = buffer + offset;
+                        lbuf->l_page = page;
+                        lbuf->l_log = log;
+                        init_waitqueue_head(&lbuf->l_ioevent);
+
+                        lbuf->l_freelist = log->lbuf_free;
+                        log->lbuf_free = lbuf;
+                        i++;
                 }
-                lbuf->l_log = log;
-                init_waitqueue_head(&lbuf->l_ioevent);
-
-                lbuf->l_freelist = log->lbuf_free;
-                log->lbuf_free = lbuf;
         }
 
         return (0);
@@ -1857,12 +1872,10 @@ static void lbmLogShutdown(struct jfs_log * log)
         lbuf = log->lbuf_free;
         while (lbuf) {
                 struct lbuf *next = lbuf->l_freelist;
-                free_page((unsigned long) lbuf->l_ldata);
+                __free_page(lbuf->l_page);
                 kfree(lbuf);
                 lbuf = next;
         }
-
-        log->bp = NULL;
 }
 
 
@@ -1974,9 +1987,9 @@ static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp)
 
         bio->bi_sector = bp->l_blkno << (log->l2bsize - 9);
         bio->bi_bdev = log->bdev;
-        bio->bi_io_vec[0].bv_page = virt_to_page(bp->l_ldata);
+        bio->bi_io_vec[0].bv_page = bp->l_page;
         bio->bi_io_vec[0].bv_len = LOGPSIZE;
-        bio->bi_io_vec[0].bv_offset = 0;
+        bio->bi_io_vec[0].bv_offset = bp->l_offset;
 
         bio->bi_vcnt = 1;
         bio->bi_idx = 0;
@@ -2115,9 +2128,9 @@ static void lbmStartIO(struct lbuf * bp)
         bio = bio_alloc(GFP_NOFS, 1);
         bio->bi_sector = bp->l_blkno << (log->l2bsize - 9);
         bio->bi_bdev = log->bdev;
-        bio->bi_io_vec[0].bv_page = virt_to_page(bp->l_ldata);
+        bio->bi_io_vec[0].bv_page = bp->l_page;
         bio->bi_io_vec[0].bv_len = LOGPSIZE;
-        bio->bi_io_vec[0].bv_offset = 0;
+        bio->bi_io_vec[0].bv_offset = bp->l_offset;
 
         bio->bi_vcnt = 1;
         bio->bi_idx = 0;
@@ -2127,16 +2140,13 @@ static void lbmStartIO(struct lbuf * bp)
         bio->bi_private = bp;
 
         /* check if journaling to disk has been disabled */
-        if (!log->no_integrity) {
+        if (log->no_integrity) {
+                bio->bi_size = 0;
+                lbmIODone(bio, 0, 0);
+        } else {
                 submit_bio(WRITE_SYNC, bio);
                 INCREMENT(lmStat.submitted);
         }
-        else {
-                bio->bi_size = 0;
-                lbmIODone(bio, 0, 0); /* 2nd argument appears to not be used => 0
-                                       *  3rd argument appears to not be used => 0
-                                       */
-        }
 }
 
 
diff --git a/fs/jfs/jfs_logmgr.h b/fs/jfs/jfs_logmgr.h
index 141ad74010c9..f67146684b7f 100644
--- a/fs/jfs/jfs_logmgr.h
+++ b/fs/jfs/jfs_logmgr.h
@@ -463,9 +463,10 @@ struct lbuf {
 
         s64 l_blkno;            /* 8: log page block number */
         caddr_t l_ldata;        /* 4: data page */
+        struct page *l_page;    /* The page itself */
+        uint l_offset;          /* Offset of l_ldata within the page */ 
 
         wait_queue_head_t l_ioevent;    /* 4: i/o done event */
-        struct page *l_page;    /* The page itself */
 };
 
 /* Reuse l_freelist for redrive list */