return err;
}
-static int ocfs2_read_inline_data(struct inode *inode, struct page *page,
- struct buffer_head *di_bh)
+int ocfs2_read_inline_data(struct inode *inode, struct page *page,
+ struct buffer_head *di_bh)
{
void *kaddr;
unsigned int size;
return ret;
}
+static int ocfs2_write_begin_inline(struct address_space *mapping,
+ struct inode *inode,
+ struct ocfs2_write_ctxt *wc)
+{
+ int ret;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct page *page;
+ handle_t *handle;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
+
+ page = find_or_create_page(mapping, 0, GFP_NOFS);
+ if (!page) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out;
+ }
+ /*
+ * If we don't set w_num_pages then this page won't get unlocked
+ * and freed on cleanup of the write context.
+ */
+ wc->w_pages[0] = wc->w_target_page = page;
+ wc->w_num_pages = 1;
+
+ handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
+ if (IS_ERR(handle)) {
+ ret = PTR_ERR(handle);
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_journal_access(handle, inode, wc->w_di_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ ocfs2_commit_trans(osb, handle);
+
+ mlog_errno(ret);
+ goto out;
+ }
+
+ if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
+ ocfs2_set_inode_data_inline(inode, di);
+
+ if (!PageUptodate(page)) {
+ ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh);
+ if (ret) {
+ ocfs2_commit_trans(osb, handle);
+
+ goto out;
+ }
+ }
+
+ wc->w_handle = handle;
+out:
+ return ret;
+}
+
+int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size)
+{
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+
+ if (new_size < le16_to_cpu(di->id2.i_data.id_count))
+ return 1;
+ return 0;
+}
+
+static int ocfs2_try_to_write_inline_data(struct address_space *mapping,
+ struct inode *inode, loff_t pos,
+ unsigned len, struct page *mmap_page,
+ struct ocfs2_write_ctxt *wc)
+{
+ int ret, written = 0;
+ loff_t end = pos + len;
+ struct ocfs2_inode_info *oi = OCFS2_I(inode);
+
+ mlog(0, "Inode %llu, write of %u bytes at off %llu. features: 0x%x\n",
+ (unsigned long long)oi->ip_blkno, len, (unsigned long long)pos,
+ oi->ip_dyn_features);
+
+ /*
+ * Handle inodes which already have inline data 1st.
+ */
+ if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
+ if (mmap_page == NULL &&
+ ocfs2_size_fits_inline_data(wc->w_di_bh, end))
+ goto do_inline_write;
+
+ /*
+ * The write won't fit - we have to give this inode an
+ * inline extent list now.
+ */
+ ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh);
+ if (ret)
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /*
+ * Check whether the inode can accept inline data.
+ */
+ if (oi->ip_clusters != 0 || i_size_read(inode) != 0)
+ return 0;
+
+ /*
+ * Check whether the write can fit.
+ */
+ if (mmap_page || end > ocfs2_max_inline_data(inode->i_sb))
+ return 0;
+
+do_inline_write:
+ ret = ocfs2_write_begin_inline(mapping, inode, wc);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /*
+ * This signals to the caller that the data can be written
+ * inline.
+ */
+ written = 1;
+out:
+ return written ? written : ret;
+}
+
/*
* This function only does anything for file systems which can't
* handle sparse files.
return ret;
}
+ if (ocfs2_supports_inline_data(osb)) {
+ ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len,
+ mmap_page, wc);
+ if (ret == 1) {
+ ret = 0;
+ goto success;
+ }
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+ }
+
ret = ocfs2_expand_nonsparse_inode(inode, pos, len, wc);
if (ret) {
mlog_errno(ret);
if (meta_ac)
ocfs2_free_alloc_context(meta_ac);
+success:
*pagep = wc->w_target_page;
*fsdata = wc;
return 0;
return ret;
}
+static void ocfs2_write_end_inline(struct inode *inode, loff_t pos,
+ unsigned len, unsigned *copied,
+ struct ocfs2_dinode *di,
+ struct ocfs2_write_ctxt *wc)
+{
+ void *kaddr;
+
+ if (unlikely(*copied < len)) {
+ if (!PageUptodate(wc->w_target_page)) {
+ *copied = 0;
+ return;
+ }
+ }
+
+ kaddr = kmap_atomic(wc->w_target_page, KM_USER0);
+ memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied);
+ kunmap_atomic(kaddr, KM_USER0);
+
+ mlog(0, "Data written to inode at offset %llu. "
+ "id_count = %u, copied = %u, i_dyn_features = 0x%x\n",
+ (unsigned long long)pos, *copied,
+ le16_to_cpu(di->id2.i_data.id_count),
+ le16_to_cpu(di->i_dyn_features));
+}
+
int ocfs2_write_end_nolock(struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
handle_t *handle = wc->w_handle;
struct page *tmppage;
+ if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
+ ocfs2_write_end_inline(inode, pos, len, &copied, di, wc);
+ goto out_write_size;
+ }
+
if (unlikely(copied < len)) {
if (!PageUptodate(wc->w_target_page))
copied = 0;
block_commit_write(tmppage, from, to);
}
+out_write_size:
pos += copied;
if (pos > inode->i_size) {
i_size_write(inode, pos);
projects / linux-2.6-omap-h63xx.git / blobdiff