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Diffstat (limited to 'fs/ocfs2/aops.c')
-rw-r--r--fs/ocfs2/aops.c94
1 files changed, 46 insertions, 48 deletions
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 3623ca20cc18..356e976772bf 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -196,15 +196,14 @@ int ocfs2_get_block(struct inode *inode, sector_t iblock,
dump_stack();
goto bail;
}
-
- past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
- mlog(0, "Inode %lu, past_eof = %llu\n", inode->i_ino,
- (unsigned long long)past_eof);
-
- if (create && (iblock >= past_eof))
- set_buffer_new(bh_result);
}
+ past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
+ mlog(0, "Inode %lu, past_eof = %llu\n", inode->i_ino,
+ (unsigned long long)past_eof);
+ if (create && (iblock >= past_eof))
+ set_buffer_new(bh_result);
+
bail:
if (err < 0)
err = -EIO;
@@ -459,36 +458,6 @@ int walk_page_buffers( handle_t *handle,
return ret;
}
-handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
- struct page *page,
- unsigned from,
- unsigned to)
-{
- struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
- handle_t *handle;
- int ret = 0;
-
- handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
- if (IS_ERR(handle)) {
- ret = -ENOMEM;
- mlog_errno(ret);
- goto out;
- }
-
- if (ocfs2_should_order_data(inode)) {
- ret = ocfs2_jbd2_file_inode(handle, inode);
- if (ret < 0)
- mlog_errno(ret);
- }
-out:
- if (ret) {
- if (!IS_ERR(handle))
- ocfs2_commit_trans(osb, handle);
- handle = ERR_PTR(ret);
- }
- return handle;
-}
-
static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
{
sector_t status;
@@ -1131,23 +1100,37 @@ out:
*/
static int ocfs2_grab_pages_for_write(struct address_space *mapping,
struct ocfs2_write_ctxt *wc,
- u32 cpos, loff_t user_pos, int new,
+ u32 cpos, loff_t user_pos,
+ unsigned user_len, int new,
struct page *mmap_page)
{
int ret = 0, i;
- unsigned long start, target_index, index;
+ unsigned long start, target_index, end_index, index;
struct inode *inode = mapping->host;
+ loff_t last_byte;
target_index = user_pos >> PAGE_CACHE_SHIFT;
/*
* Figure out how many pages we'll be manipulating here. For
* non allocating write, we just change the one
- * page. Otherwise, we'll need a whole clusters worth.
+ * page. Otherwise, we'll need a whole clusters worth. If we're
+ * writing past i_size, we only need enough pages to cover the
+ * last page of the write.
*/
if (new) {
wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb);
start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos);
+ /*
+ * We need the index *past* the last page we could possibly
+ * touch. This is the page past the end of the write or
+ * i_size, whichever is greater.
+ */
+ last_byte = max(user_pos + user_len, i_size_read(inode));
+ BUG_ON(last_byte < 1);
+ end_index = ((last_byte - 1) >> PAGE_CACHE_SHIFT) + 1;
+ if ((start + wc->w_num_pages) > end_index)
+ wc->w_num_pages = end_index - start;
} else {
wc->w_num_pages = 1;
start = target_index;
@@ -1620,21 +1603,20 @@ out:
* write path can treat it as an non-allocating write, which has no
* special case code for sparse/nonsparse files.
*/
-static int ocfs2_expand_nonsparse_inode(struct inode *inode, loff_t pos,
- unsigned len,
+static int ocfs2_expand_nonsparse_inode(struct inode *inode,
+ struct buffer_head *di_bh,
+ loff_t pos, unsigned len,
struct ocfs2_write_ctxt *wc)
{
int ret;
- struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
loff_t newsize = pos + len;
- if (ocfs2_sparse_alloc(osb))
- return 0;
+ BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
if (newsize <= i_size_read(inode))
return 0;
- ret = ocfs2_extend_no_holes(inode, newsize, pos);
+ ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos);
if (ret)
mlog_errno(ret);
@@ -1644,6 +1626,18 @@ static int ocfs2_expand_nonsparse_inode(struct inode *inode, loff_t pos,
return ret;
}
+static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh,
+ loff_t pos)
+{
+ int ret = 0;
+
+ BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
+ if (pos > i_size_read(inode))
+ ret = ocfs2_zero_extend(inode, di_bh, pos);
+
+ return ret;
+}
+
int ocfs2_write_begin_nolock(struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata,
@@ -1679,7 +1673,11 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
}
}
- ret = ocfs2_expand_nonsparse_inode(inode, pos, len, wc);
+ if (ocfs2_sparse_alloc(osb))
+ ret = ocfs2_zero_tail(inode, di_bh, pos);
+ else
+ ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, len,
+ wc);
if (ret) {
mlog_errno(ret);
goto out;
@@ -1789,7 +1787,7 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
* that we can zero and flush if we error after adding the
* extent.
*/
- ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos,
+ ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len,
cluster_of_pages, mmap_page);
if (ret) {
mlog_errno(ret);

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