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Diffstat (limited to 'fs/ntfs/attrib.c')
-rw-r--r--fs/ntfs/attrib.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/fs/ntfs/attrib.c b/fs/ntfs/attrib.c
index 33e689f82a5..380f70a5f2e 100644
--- a/fs/ntfs/attrib.c
+++ b/fs/ntfs/attrib.c
@@ -1501,10 +1501,17 @@ int ntfs_resident_attr_value_resize(MFT_RECORD *m, ATTR_RECORD *a,
/**
* ntfs_attr_make_non_resident - convert a resident to a non-resident attribute
* @ni: ntfs inode describing the attribute to convert
+ * @data_size: size of the resident data to copy to the non-resident attribute
*
* Convert the resident ntfs attribute described by the ntfs inode @ni to a
* non-resident one.
*
+ * @data_size must be equal to the attribute value size. This is needed since
+ * we need to know the size before we can map the mft record and our callers
+ * always know it. The reason we cannot simply read the size from the vfs
+ * inode i_size is that this is not necessarily uptodate. This happens when
+ * ntfs_attr_make_non_resident() is called in the ->truncate call path(s).
+ *
* Return 0 on success and -errno on error. The following error return codes
* are defined:
* -EPERM - The attribute is not allowed to be non-resident.
@@ -1525,7 +1532,7 @@ int ntfs_resident_attr_value_resize(MFT_RECORD *m, ATTR_RECORD *a,
*
* Locking: - The caller must hold i_sem on the inode.
*/
-int ntfs_attr_make_non_resident(ntfs_inode *ni)
+int ntfs_attr_make_non_resident(ntfs_inode *ni, const u32 data_size)
{
s64 new_size;
struct inode *vi = VFS_I(ni);
@@ -1563,7 +1570,7 @@ int ntfs_attr_make_non_resident(ntfs_inode *ni)
* The size needs to be aligned to a cluster boundary for allocation
* purposes.
*/
- new_size = (i_size_read(vi) + vol->cluster_size - 1) &
+ new_size = (data_size + vol->cluster_size - 1) &
~(vol->cluster_size - 1);
if (new_size > 0) {
/*
@@ -1647,7 +1654,7 @@ int ntfs_attr_make_non_resident(ntfs_inode *ni)
* attribute value.
*/
attr_size = le32_to_cpu(a->data.resident.value_length);
- BUG_ON(attr_size != i_size_read(vi));
+ BUG_ON(attr_size != data_size);
if (page && !PageUptodate(page)) {
kaddr = kmap_atomic(page, KM_USER0);
memcpy(kaddr, (u8*)a +