We should add inode to the orphan list in the same transaction
as block allocation. This ensures that if we crash after a failed
block allocation and before we do a vmtruncate we don't leak block
(ie block marked as used in bitmap but not claimed by the inode).
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
CC: Jan Kara <jack@xxxxxxx>
---
fs/ext4/inode.c | 22 ++++++++++++++++++++--
1 files changed, 20 insertions(+), 2 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 00ebc99..820cb58 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1459,7 +1459,7 @@ static int ext4_write_begin(struct file *file, struct address_space *mapping,
struct page **pagep, void **fsdata)
{
struct inode *inode = mapping->host;
- int ret, needed_blocks = ext4_writepage_trans_blocks(inode);
+ int ret, needed_blocks;
handle_t *handle;
int retries = 0;
struct page *page;
@@ -1470,6 +1470,11 @@ static int ext4_write_begin(struct file *file, struct address_space *mapping,
"dev %s ino %lu pos %llu len %u flags %u",
inode->i_sb->s_id, inode->i_ino,
(unsigned long long) pos, len, flags);
+ /*
+ * Reserve one block more for addition to orphan list in case
+ * we allocate blocks but write fails for some reason
+ */
+ needed_blocks = ext4_writepage_trans_blocks(inode) + 1;
index = pos >> PAGE_CACHE_SHIFT;
from = pos & (PAGE_CACHE_SIZE - 1);
to = from + len;
@@ -1503,14 +1508,20 @@ static int ext4_write_begin(struct file *file, struct address_space *mapping,
if (ret) {
unlock_page(page);
- ext4_journal_stop(handle);
page_cache_release(page);
/*
* block_write_begin may have instantiated a few blocks
* outside i_size. Trim these off again. Don't need
* i_size_read because we hold i_mutex.
+ *
+ * Add inode to orphan list in case we crash before
+ * truncate finishes
*/
if (pos + len > inode->i_size)
+ ext4_orphan_add(handle, inode);
+
+ ext4_journal_stop(handle);
+ if (pos + len > inode->i_size)
vmtruncate(inode, inode->i_size);
}
@@ -1519,6 +1530,13 @@ static int ext4_write_begin(struct file *file, struct address_space *mapping,
out:
if (ret)
block_unlock_hole_extend(inode);
+ /*
+ * if vmtruncate failed to remove the inode from
+ * orphan list remove ourself
+ */
+ if (inode->i_nlink)
+ ext4_orphan_del(NULL, inode);
+
return ret;
}
--
1.6.3.1.244.gf9275
--
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