Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/agpgart

[pandora-kernel.git] / drivers / md / bitmap.c

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index ecc5676..1110816 100644 (file)
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -212,8 +212,8 @@ char *file_path(struct file *file, char *buf, int count)
        if (!buf)
                return NULL;
 
-       d = file->f_dentry;
-       v = file->f_vfsmnt;
+       d = file->f_path.dentry;
+       v = file->f_path.mnt;
 
        buf = d_path(d, v, buf, count);
 
@@ -349,7 +349,7 @@ static struct page *read_page(struct file *file, unsigned long index,
                              unsigned long count)
 {
        struct page *page = NULL;
-       struct inode *inode = file->f_dentry->d_inode;
+       struct inode *inode = file->f_path.dentry->d_inode;
        struct buffer_head *bh;
        sector_t block;
 
@@ -479,9 +479,12 @@ static int bitmap_read_sb(struct bitmap *bitmap)
        int err = -EINVAL;
 
        /* page 0 is the superblock, read it... */
-       if (bitmap->file)
-               bitmap->sb_page = read_page(bitmap->file, 0, bitmap, PAGE_SIZE);
-       else {
+       if (bitmap->file) {
+               loff_t isize = i_size_read(bitmap->file->f_mapping->host);
+               int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize;
+
+               bitmap->sb_page = read_page(bitmap->file, 0, bitmap, bytes);
+       } else {
                bitmap->sb_page = read_sb_page(bitmap->mddev, bitmap->offset, 0);
        }
        if (IS_ERR(bitmap->sb_page)) {
@@ -536,7 +539,7 @@ static int bitmap_read_sb(struct bitmap *bitmap)
                printk(KERN_INFO "%s: bitmap file is out of date (%llu < %llu) "
                        "-- forcing full recovery\n", bmname(bitmap), events,
                        (unsigned long long) bitmap->mddev->events);
-               sb->state |= BITMAP_STALE;
+               sb->state |= cpu_to_le32(BITMAP_STALE);
        }
 success:
        /* assign fields using values from superblock */
@@ -544,11 +547,11 @@ success:
        bitmap->daemon_sleep = daemon_sleep;
        bitmap->daemon_lastrun = jiffies;
        bitmap->max_write_behind = write_behind;
-       bitmap->flags |= sb->state;
+       bitmap->flags |= le32_to_cpu(sb->state);
        if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN)
                bitmap->flags |= BITMAP_HOSTENDIAN;
        bitmap->events_cleared = le64_to_cpu(sb->events_cleared);
-       if (sb->state & BITMAP_STALE)
+       if (sb->state & cpu_to_le32(BITMAP_STALE))
                bitmap->events_cleared = bitmap->mddev->events;
        err = 0;
 out:
@@ -578,9 +581,9 @@ static void bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits,
        spin_unlock_irqrestore(&bitmap->lock, flags);
        sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0);
        switch (op) {
-               case MASK_SET: sb->state |= bits;
+               case MASK_SET: sb->state |= cpu_to_le32(bits);
                                break;
-               case MASK_UNSET: sb->state &= ~bits;
+               case MASK_UNSET: sb->state &= cpu_to_le32(~bits);
                                break;
                default: BUG();
        }
@@ -613,6 +616,7 @@ static inline unsigned long file_page_offset(unsigned long chunk)
 static inline struct page *filemap_get_page(struct bitmap *bitmap,
                                        unsigned long chunk)
 {
+       if (file_page_index(chunk) >= bitmap->file_pages) return NULL;
        return bitmap->filemap[file_page_index(chunk) - file_page_index(0)];
 }
 
@@ -661,7 +665,7 @@ static void bitmap_file_put(struct bitmap *bitmap)
        bitmap_file_unmap(bitmap);
 
        if (file) {
-               struct inode *inode = file->f_dentry->d_inode;
+               struct inode *inode = file->f_path.dentry->d_inode;
                invalidate_inode_pages(inode->i_mapping);
                fput(file);
        }
@@ -739,6 +743,7 @@ static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
        }
 
        page = filemap_get_page(bitmap, chunk);
+       if (!page) return;
        bit = file_page_offset(chunk);
 
        /* set the bit */
@@ -875,7 +880,8 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
                        int count;
                        /* unmap the old page, we're done with it */
                        if (index == num_pages-1)
-                               count = bytes - index * PAGE_SIZE;
+                               count = bytes + sizeof(bitmap_super_t)
+                                       - index * PAGE_SIZE;
                        else
                                count = PAGE_SIZE;
                        if (index == 0) {
@@ -1322,6 +1328,18 @@ static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int n
 
 }
 
+/* dirty the memory and file bits for bitmap chunks "s" to "e" */
+void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e)
+{
+       unsigned long chunk;
+
+       for (chunk = s; chunk <= e; chunk++) {
+               sector_t sec = chunk << CHUNK_BLOCK_SHIFT(bitmap);
+               bitmap_set_memory_bits(bitmap, sec, 1);
+               bitmap_file_set_bit(bitmap, sec);
+       }
+}
+
 /*
  * flush out any pending updates
  */
@@ -1399,7 +1417,7 @@ int bitmap_create(mddev_t *mddev)
        int err;
        sector_t start;
 
-       BUG_ON(sizeof(bitmap_super_t) != 256);
+       BUILD_BUG_ON(sizeof(bitmap_super_t) != 256);
 
        if (!file && !mddev->bitmap_offset) /* bitmap disabled, nothing to do */
                return 0;
@@ -1430,8 +1448,7 @@ int bitmap_create(mddev_t *mddev)
        if (err)
                goto error;
 
-       bitmap->chunkshift = find_first_bit(&bitmap->chunksize,
-                                       sizeof(bitmap->chunksize));
+       bitmap->chunkshift = ffz(~bitmap->chunksize);
 
        /* now that chunksize and chunkshift are set, we can use these macros */
        chunks = (blocks + CHUNK_BLOCK_RATIO(bitmap) - 1) /