NTFS: Fix handling of sparse attributes in ntfs_attr_make_non_resident().
Also, add BUG() checks to ntfs_attr_make_non_resident() and
ntfs_attr_set() to ensure that these functions are never called
for compressed or encrypted attributes.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
diff --git a/fs/ntfs/attrib.c b/fs/ntfs/attrib.c
index 98b5b96..3f9a4ff 100644
--- a/fs/ntfs/attrib.c
+++ b/fs/ntfs/attrib.c
@@ -1372,6 +1372,12 @@
return err;
}
/*
+ * FIXME: Compressed and encrypted attributes are not supported when
+ * writing and we should never have gotten here for them.
+ */
+ BUG_ON(NInoCompressed(ni));
+ BUG_ON(NInoEncrypted(ni));
+ /*
* The size needs to be aligned to a cluster boundary for allocation
* purposes.
*/
@@ -1447,10 +1453,15 @@
BUG_ON(a->non_resident);
/*
* Calculate new offsets for the name and the mapping pairs array.
- * We assume the attribute is not compressed or sparse.
*/
- name_ofs = (offsetof(ATTR_REC,
- data.non_resident.compressed_size) + 7) & ~7;
+ if (NInoSparse(ni) || NInoCompressed(ni))
+ name_ofs = (offsetof(ATTR_REC,
+ data.non_resident.compressed_size) +
+ sizeof(a->data.non_resident.compressed_size) +
+ 7) & ~7;
+ else
+ name_ofs = (offsetof(ATTR_REC,
+ data.non_resident.compressed_size) + 7) & ~7;
mp_ofs = (name_ofs + a->name_length * sizeof(ntfschar) + 7) & ~7;
/*
* Determine the size of the resident part of the now non-resident
@@ -1489,24 +1500,23 @@
memmove((u8*)a + name_ofs, (u8*)a + le16_to_cpu(a->name_offset),
a->name_length * sizeof(ntfschar));
a->name_offset = cpu_to_le16(name_ofs);
- /*
- * FIXME: For now just clear all of these as we do not support them
- * when writing.
- */
- a->flags &= cpu_to_le16(0xffff & ~le16_to_cpu(ATTR_IS_SPARSE |
- ATTR_IS_ENCRYPTED | ATTR_COMPRESSION_MASK));
/* Setup the fields specific to non-resident attributes. */
a->data.non_resident.lowest_vcn = 0;
a->data.non_resident.highest_vcn = cpu_to_sle64((new_size - 1) >>
vol->cluster_size_bits);
a->data.non_resident.mapping_pairs_offset = cpu_to_le16(mp_ofs);
- a->data.non_resident.compression_unit = 0;
memset(&a->data.non_resident.reserved, 0,
sizeof(a->data.non_resident.reserved));
a->data.non_resident.allocated_size = cpu_to_sle64(new_size);
a->data.non_resident.data_size =
a->data.non_resident.initialized_size =
cpu_to_sle64(attr_size);
+ if (NInoSparse(ni) || NInoCompressed(ni)) {
+ a->data.non_resident.compression_unit = 4;
+ a->data.non_resident.compressed_size =
+ a->data.non_resident.allocated_size;
+ } else
+ a->data.non_resident.compression_unit = 0;
/* Generate the mapping pairs array into the attribute record. */
err = ntfs_mapping_pairs_build(vol, (u8*)a + mp_ofs,
arec_size - mp_ofs, rl, 0, -1, NULL);
@@ -1516,16 +1526,19 @@
goto undo_err_out;
}
/* Setup the in-memory attribute structure to be non-resident. */
- /*
- * FIXME: For now just clear all of these as we do not support them
- * when writing.
- */
- NInoClearSparse(ni);
- NInoClearEncrypted(ni);
- NInoClearCompressed(ni);
ni->runlist.rl = rl;
write_lock_irqsave(&ni->size_lock, flags);
ni->allocated_size = new_size;
+ if (NInoSparse(ni) || NInoCompressed(ni)) {
+ ni->itype.compressed.size = ni->allocated_size;
+ ni->itype.compressed.block_size = 1U <<
+ (a->data.non_resident.compression_unit +
+ vol->cluster_size_bits);
+ ni->itype.compressed.block_size_bits =
+ ffs(ni->itype.compressed.block_size) - 1;
+ ni->itype.compressed.block_clusters = 1U <<
+ a->data.non_resident.compression_unit;
+ }
write_unlock_irqrestore(&ni->size_lock, flags);
/*
* This needs to be last since the address space operations ->readpage
@@ -1673,6 +1686,12 @@
BUG_ON(cnt < 0);
if (!cnt)
goto done;
+ /*
+ * FIXME: Compressed and encrypted attributes are not supported when
+ * writing and we should never have gotten here for them.
+ */
+ BUG_ON(NInoCompressed(ni));
+ BUG_ON(NInoEncrypted(ni));
mapping = VFS_I(ni)->i_mapping;
/* Work out the starting index and page offset. */
idx = ofs >> PAGE_CACHE_SHIFT;