VServer 1.9.2 (patch-2.6.8.1-vs1.9.2.diff)

[linux-2.6.git] / fs / jfs / jfs_metapage.c

diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
index 8c94bb0..831ee09 100644 (file)
--- a/fs/jfs/jfs_metapage.c
+++ b/fs/jfs/jfs_metapage.c
@@ -225,8 +225,16 @@ struct metapage *__get_metapage(struct inode *inode, unsigned long lblock,
 
        if (absolute)
                mapping = inode->i_sb->s_bdev->bd_inode->i_mapping;
-       else
+       else {
+               /*
+                * If an nfs client tries to read an inode that is larger
+                * than any existing inodes, we may try to read past the
+                * end of the inode map
+                */
+               if ((lblock << inode->i_blkbits) >= inode->i_size)
+                       return NULL;
                mapping = inode->i_mapping;
+       }
 
        hash_ptr = meta_hash(mapping, lblock);
 again:
@@ -320,7 +328,7 @@ again:
                atomic_set(&mp->nohomeok,0);
                mp->mapping = mapping;
                mp->index = lblock;
-               mp->page = 0;
+               mp->page = NULL;
                mp->logical_size = size;
                add_to_hash(mp, hash_ptr);
                spin_unlock(&meta_lock);
@@ -465,7 +473,7 @@ void release_metapage(struct metapage * mp)
                set_bit(META_stale, &mp->flag);
                spin_unlock(&meta_lock);
                kunmap(mp->page);
-               mp->data = 0;
+               mp->data = NULL;
                if (test_bit(META_dirty, &mp->flag))
                        __write_metapage(mp);
                if (test_bit(META_sync, &mp->flag)) {
@@ -491,7 +499,7 @@ void release_metapage(struct metapage * mp)
                 */
                log = mp->log;
                LOGSYNC_LOCK(log);
-               mp->log = 0;
+               mp->log = NULL;
                mp->lsn = 0;
                mp->clsn = 0;
                log->count--;