Commit 737db367 authored by Anton Altaparmakov's avatar Anton Altaparmakov

NTFS: Minor bug fix in attribute list attribute handling that fixes the

I/O errors on "ls" of certain fragmented files found by at least two
people running Windows XP.
parent ec004d58
......@@ -272,6 +272,10 @@ ChangeLog
Note, a technical ChangeLog aimed at kernel hackers is in fs/ntfs/ChangeLog.
2.1.5:
- Minor bug fix in attribute list attribute handling that fixes the
I/O errors on "ls" of certain fragmented files found by at least two
people running Windows XP.
2.1.4:
- Minor update allowing compilation with all gcc versions (well, the
ones the kernel can be compiled with anyway).
......
......@@ -20,6 +20,14 @@ ToDo:
sufficient for synchronisation here. We then just need to make sure
ntfs_readpage/writepage/truncate interoperate properly with us.
2.1.5 - Fix minor bug in attribute list attribute handling.
- Fix bug in attribute list handling. Actually it is not as much a bug
as too much protection in that we were not allowing attribute lists
which waste space on disk while Windows XP clearly allows it and in
fact creates such attribute lists so our driver was failing.
- Update NTFS documentation ready for 2.6 kernel release.
2.1.4 - Reduce compiler requirements.
- Remove all uses of unnamed structs and unions in the driver to make
......
......@@ -5,7 +5,7 @@ obj-$(CONFIG_NTFS_FS) += ntfs.o
ntfs-objs := aops.o attrib.o compress.o debug.o dir.o file.o inode.o mft.o \
mst.o namei.o super.o sysctl.o time.o unistr.o upcase.o
EXTRA_CFLAGS = -DNTFS_VERSION=\"2.1.4\"
EXTRA_CFLAGS = -DNTFS_VERSION=\"2.1.5\"
ifeq ($(CONFIG_NTFS_DEBUG),y)
EXTRA_CFLAGS += -DDEBUG
......
......@@ -1215,7 +1215,7 @@ BOOL find_attr(const ATTR_TYPES type, const uchar_t *name, const u32 name_len,
* load_attribute_list - load an attribute list into memory
* @vol: ntfs volume from which to read
* @run_list: run list of the attribute list
* @al: destination buffer
* @al_start: destination buffer
* @size: size of the destination buffer in bytes
* @initialized_size: initialized size of the attribute list
*
......@@ -1227,10 +1227,11 @@ BOOL find_attr(const ATTR_TYPES type, const uchar_t *name, const u32 name_len,
*
* Return 0 on success or -errno on error.
*/
int load_attribute_list(ntfs_volume *vol, run_list *run_list, u8 *al,
int load_attribute_list(ntfs_volume *vol, run_list *run_list, u8 *al_start,
const s64 size, const s64 initialized_size)
{
LCN lcn;
u8 *al = al_start;
u8 *al_end = al + initialized_size;
run_list_element *rl;
struct buffer_head *bh;
......@@ -1284,31 +1285,27 @@ int load_attribute_list(ntfs_volume *vol, run_list *run_list, u8 *al,
}
if (initialized_size < size) {
initialize:
memset(al + initialized_size, 0, size - initialized_size);
memset(al_start + initialized_size, 0, size - initialized_size);
}
done:
up_read(&run_list->lock);
return err;
do_final:
if (al < al_end) {
/* Partial block. */
memcpy(al, bh->b_data, al_end - al);
brelse(bh);
/*
* Skip sanity checking if initialized_size < size as it is
* too much trouble.
* Partial block.
*
* Note: The attribute list can be smaller than its allocation
* by multiple clusters. This has been encountered by at least
* two people running Windows XP, thus we cannot do any
* truncation sanity checking here. (AIA)
*/
memcpy(al, bh->b_data, al_end - al);
brelse(bh);
if (initialized_size < size)
goto initialize;
/* If the final lcn is partial all is fine. */
if (((s64)(block - (lcn << vol->cluster_size_bits >>
block_size_bits)) << block_size_bits >>
vol->cluster_size_bits) == rl->length - 1) {
if (!rl[1].length || (rl[1].lcn == LCN_RL_NOT_MAPPED
&& !rl[2].length))
goto done;
}
} else
brelse(bh);
/* Real overflow! */
ntfs_error(sb, "Attribute list buffer overflow. Read attribute list "
......
......@@ -87,7 +87,7 @@ BOOL lookup_attr(const ATTR_TYPES type, const uchar_t *name, const u32 name_len,
const IGNORE_CASE_BOOL ic, const VCN lowest_vcn, const u8 *val,
const u32 val_len, attr_search_context *ctx);
extern int load_attribute_list(ntfs_volume *vol, run_list *rl, u8 *al,
extern int load_attribute_list(ntfs_volume *vol, run_list *rl, u8 *al_start,
const s64 size, const s64 initialized_size);
static inline s64 attribute_value_length(const ATTR_RECORD *a)
......
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