From: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
Subject: [PATCH] nilfs2: add logic for the case of file growing (old size <= new size) in nilfs_truncate()
There are situations when nilfs_truncate() is called with new value of i_size that is greater than old one. This patch adds logic for such case.
Signed-off-by: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
CC: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
---
fs/nilfs2/inode.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 6b49f14..5ccaace 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -698,6 +698,36 @@ void nilfs_truncate(struct inode *inode)
blocksize = sb->s_blocksize;
blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
+
+ if (blkoff > inode->i_blocks) {
+ int err;
+ struct address_space *mapping = inode->i_mapping;
+ struct page *page;
+ void *fsdata;
+ loff_t size = inode->i_size;
+
+ err = pagecache_write_begin(NULL, mapping, size, 0,
+ AOP_FLAG_UNINTERRUPTIBLE,
+ &page, &fsdata);
+ if (err) {
+ printk(KERN_ERR
+ "NILFS: pagecache_write_begin() failed: err %d",
+ err);
+ return;
+ }
+ err = pagecache_write_end(NULL, mapping, size,
+ 0, 0, page, fsdata);
+ if (err < 0) {
+ printk(KERN_ERR
+ "NILFS: pagecache_write_end() failed: err %d",
+ err);
+ return;
+ }
+ mark_inode_dirty(inode);
+ return;
+ } else if (blkoff == inode->i_blocks)
+ return;
+
nilfs_transaction_begin(sb, &ti, 0); /* never fails */
block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
--
1.7.9.5
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