struct buffer_head *bh_result, int create)
{
int ret;
- u64 vbo_max; /* file offset, max_blocks from iblock */
- u64 p_blkno;
+ u64 p_blkno, inode_blocks;
int contig_blocks;
unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
* nicely aligned and of the right size, so there's no need
* for us to check any of that. */
- vbo_max = ((u64)iblock + max_blocks) << blocksize_bits;
-
spin_lock(&OCFS2_I(inode)->ip_lock);
- if ((iblock + max_blocks) >
- ocfs2_clusters_to_blocks(inode->i_sb,
- OCFS2_I(inode)->ip_clusters)) {
+ inode_blocks = ocfs2_clusters_to_blocks(inode->i_sb,
+ OCFS2_I(inode)->ip_clusters);
+
+ /*
+ * For a read which begins past the end of file, we return a hole.
+ */
+ if (!create && (iblock >= inode_blocks)) {
+ spin_unlock(&OCFS2_I(inode)->ip_lock);
+ ret = 0;
+ goto bail;
+ }
+
+ /*
+ * Any write past EOF is not allowed because we'd be extending.
+ */
+ if (create && (iblock + max_blocks) > inode_blocks) {
spin_unlock(&OCFS2_I(inode)->ip_lock);
ret = -EIO;
goto bail;
ocfs2_rw_unlock(inode, 0);
}
+/*
+ * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen
+ * from ext3. PageChecked() bits have been removed as OCFS2 does not
+ * do journalled data.
+ */
+static void ocfs2_invalidatepage(struct page *page, unsigned long offset)
+{
+ journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
+
+ journal_invalidatepage(journal, page, offset);
+}
+
+static int ocfs2_releasepage(struct page *page, gfp_t wait)
+{
+ journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
+
+ if (!page_has_buffers(page))
+ return 0;
+ return journal_try_to_free_buffers(journal, page, wait);
+}
+
static ssize_t ocfs2_direct_IO(int rw,
struct kiocb *iocb,
const struct iovec *iov,
.commit_write = ocfs2_commit_write,
.bmap = ocfs2_bmap,
.sync_page = block_sync_page,
- .direct_IO = ocfs2_direct_IO
+ .direct_IO = ocfs2_direct_IO,
+ .invalidatepage = ocfs2_invalidatepage,
+ .releasepage = ocfs2_releasepage,
+ .migratepage = buffer_migrate_page,
};