NTFS: Fix various bugs in the runlist merging code. (Based on libntfs
changes by Richard Russon.)
Signed-off-by: Anton Altaparmakov <[email protected]>
---
fs/ntfs/ChangeLog | 2 +
fs/ntfs/runlist.c | 132 +++++++++++++++++++++++++++--------------------------
2 files changed, 70 insertions(+), 64 deletions(-)
5c9f6de3b80ca46000bd1b63d892820f9ee32138
diff --git a/fs/ntfs/ChangeLog b/fs/ntfs/ChangeLog
--- a/fs/ntfs/ChangeLog
+++ b/fs/ntfs/ChangeLog
@@ -92,6 +92,8 @@ ToDo/Notes:
an octal number to conform to how chmod(1) works, too. Thanks to
Giuseppe Bilotta and Horst von Brand for pointing out the errors of
my ways.
+ - Fix various bugs in the runlist merging code. (Based on libntfs
+ changes by Richard Russon.)
2.1.23 - Implement extension of resident files and make writing safe as well as
many bug fixes, cleanups, and enhancements...
diff --git a/fs/ntfs/runlist.c b/fs/ntfs/runlist.c
--- a/fs/ntfs/runlist.c
+++ b/fs/ntfs/runlist.c
@@ -2,7 +2,7 @@
* runlist.c - NTFS runlist handling code. Part of the Linux-NTFS project.
*
* Copyright (c) 2001-2005 Anton Altaparmakov
- * Copyright (c) 2002 Richard Russon
+ * Copyright (c) 2002-2005 Richard Russon
*
* This program/include file is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
@@ -214,8 +214,8 @@ static inline void __ntfs_rl_merge(runli
static inline runlist_element *ntfs_rl_append(runlist_element *dst,
int dsize, runlist_element *src, int ssize, int loc)
{
- BOOL right;
- int magic;
+ BOOL right; /* Right end of @src needs merging. */
+ int marker; /* End of the inserted runs. */
BUG_ON(!dst);
BUG_ON(!src);
@@ -236,18 +236,19 @@ static inline runlist_element *ntfs_rl_a
if (right)
__ntfs_rl_merge(src + ssize - 1, dst + loc + 1);
- magic = loc + ssize;
+ /* First run after the @src runs that have been inserted. */
+ marker = loc + ssize + 1;
/* Move the tail of @dst out of the way, then copy in @src. */
- ntfs_rl_mm(dst, magic + 1, loc + 1 + right, dsize - loc - 1 - right);
+ ntfs_rl_mm(dst, marker, loc + 1 + right, dsize - (loc + 1 + right));
ntfs_rl_mc(dst, loc + 1, src, 0, ssize);
/* Adjust the size of the preceding hole. */
dst[loc].length = dst[loc + 1].vcn - dst[loc].vcn;
/* We may have changed the length of the file, so fix the end marker */
- if (dst[magic + 1].lcn == LCN_ENOENT)
- dst[magic + 1].vcn = dst[magic].vcn + dst[magic].length;
+ if (dst[marker].lcn == LCN_ENOENT)
+ dst[marker].vcn = dst[marker - 1].vcn + dst[marker - 1].length;
return dst;
}
@@ -279,18 +280,17 @@ static inline runlist_element *ntfs_rl_a
static inline runlist_element *ntfs_rl_insert(runlist_element *dst,
int dsize, runlist_element *src, int ssize, int loc)
{
- BOOL left = FALSE;
- BOOL disc = FALSE; /* Discontinuity */
- BOOL hole = FALSE; /* Following a hole */
- int magic;
+ BOOL left = FALSE; /* Left end of @src needs merging. */
+ BOOL disc = FALSE; /* Discontinuity between @dst and @src. */
+ int marker; /* End of the inserted runs. */
BUG_ON(!dst);
BUG_ON(!src);
- /* disc => Discontinuity between the end of @dst and the start of @src.
- * This means we might need to insert a hole.
- * hole => @dst ends with a hole or an unmapped region which we can
- * extend to match the discontinuity. */
+ /*
+ * disc => Discontinuity between the end of @dst and the start of @src.
+ * This means we might need to insert a "not mapped" run.
+ */
if (loc == 0)
disc = (src[0].vcn > 0);
else {
@@ -303,58 +303,49 @@ static inline runlist_element *ntfs_rl_i
merged_length += src->length;
disc = (src[0].vcn > dst[loc - 1].vcn + merged_length);
- if (disc)
- hole = (dst[loc - 1].lcn == LCN_HOLE);
}
-
- /* Space required: @dst size + @src size, less one if we merged, plus
- * one if there was a discontinuity, less one for a trailing hole. */
- dst = ntfs_rl_realloc(dst, dsize, dsize + ssize - left + disc - hole);
+ /*
+ * Space required: @dst size + @src size, less one if we merged, plus
+ * one if there was a discontinuity.
+ */
+ dst = ntfs_rl_realloc(dst, dsize, dsize + ssize - left + disc);
if (IS_ERR(dst))
return dst;
/*
* We are guaranteed to succeed from here so can start modifying the
* original runlist.
*/
-
if (left)
__ntfs_rl_merge(dst + loc - 1, src);
-
- magic = loc + ssize - left + disc - hole;
+ /*
+ * First run after the @src runs that have been inserted.
+ * Nominally, @marker equals @loc + @ssize, i.e. location + number of
+ * runs in @src. However, if @left, then the first run in @src has
+ * been merged with one in @dst. And if @disc, then @dst and @src do
+ * not meet and we need an extra run to fill the gap.
+ */
+ marker = loc + ssize - left + disc;
/* Move the tail of @dst out of the way, then copy in @src. */
- ntfs_rl_mm(dst, magic, loc, dsize - loc);
- ntfs_rl_mc(dst, loc + disc - hole, src, left, ssize - left);
+ ntfs_rl_mm(dst, marker, loc, dsize - loc);
+ ntfs_rl_mc(dst, loc + disc, src, left, ssize - left);
- /* Adjust the VCN of the last run ... */
- if (dst[magic].lcn <= LCN_HOLE)
- dst[magic].vcn = dst[magic - 1].vcn + dst[magic - 1].length;
+ /* Adjust the VCN of the first run after the insertion... */
+ dst[marker].vcn = dst[marker - 1].vcn + dst[marker - 1].length;
/* ... and the length. */
- if (dst[magic].lcn == LCN_HOLE || dst[magic].lcn == LCN_RL_NOT_MAPPED)
- dst[magic].length = dst[magic + 1].vcn - dst[magic].vcn;
+ if (dst[marker].lcn == LCN_HOLE || dst[marker].lcn == LCN_RL_NOT_MAPPED)
+ dst[marker].length = dst[marker + 1].vcn - dst[marker].vcn;
- /* Writing beyond the end of the file and there's a discontinuity. */
+ /* Writing beyond the end of the file and there is a discontinuity. */
if (disc) {
- if (hole)
- dst[loc - 1].length = dst[loc].vcn - dst[loc - 1].vcn;
- else {
- if (loc > 0) {
- dst[loc].vcn = dst[loc - 1].vcn +
- dst[loc - 1].length;
- dst[loc].length = dst[loc + 1].vcn -
- dst[loc].vcn;
- } else {
- dst[loc].vcn = 0;
- dst[loc].length = dst[loc + 1].vcn;
- }
- dst[loc].lcn = LCN_RL_NOT_MAPPED;
+ if (loc > 0) {
+ dst[loc].vcn = dst[loc - 1].vcn + dst[loc - 1].length;
+ dst[loc].length = dst[loc + 1].vcn - dst[loc].vcn;
+ } else {
+ dst[loc].vcn = 0;
+ dst[loc].length = dst[loc + 1].vcn;
}
-
- magic += hole;
-
- if (dst[magic].lcn == LCN_ENOENT)
- dst[magic].vcn = dst[magic - 1].vcn +
- dst[magic - 1].length;
+ dst[loc].lcn = LCN_RL_NOT_MAPPED;
}
return dst;
}
@@ -385,9 +376,10 @@ static inline runlist_element *ntfs_rl_i
static inline runlist_element *ntfs_rl_replace(runlist_element *dst,
int dsize, runlist_element *src, int ssize, int loc)
{
- BOOL left = FALSE;
- BOOL right;
- int magic;
+ BOOL left = FALSE; /* Left end of @src needs merging. */
+ BOOL right; /* Right end of @src needs merging. */
+ int tail; /* Start of tail of @dst. */
+ int marker; /* End of the inserted runs. */
BUG_ON(!dst);
BUG_ON(!src);
@@ -396,9 +388,10 @@ static inline runlist_element *ntfs_rl_r
right = ntfs_are_rl_mergeable(src + ssize - 1, dst + loc + 1);
if (loc > 0)
left = ntfs_are_rl_mergeable(dst + loc - 1, src);
-
- /* Allocate some space. We'll need less if the left, right, or both
- * ends were merged. */
+ /*
+ * Allocate some space. We will need less if the left, right, or both
+ * ends were merged.
+ */
dst = ntfs_rl_realloc(dst, dsize, dsize + ssize - left - right);
if (IS_ERR(dst))
return dst;
@@ -410,17 +403,28 @@ static inline runlist_element *ntfs_rl_r
__ntfs_rl_merge(src + ssize - 1, dst + loc + 1);
if (left)
__ntfs_rl_merge(dst + loc - 1, src);
-
- /* FIXME: What does this mean? (AIA) */
- magic = loc + ssize - left;
+ /*
+ * First run of @dst that needs to be moved out of the way to make
+ * space for the runs to be copied from @src, i.e. the first run of the
+ * tail of @dst.
+ */
+ tail = loc + right + 1;
+ /*
+ * First run after the @src runs that have been inserted, i.e. where
+ * the tail of @dst needs to be moved to.
+ * Nominally, marker equals @loc + @ssize, i.e. location + number of
+ * runs in @src). However, if @left, then the first run in @src has
+ * been merged with one in @dst.
+ */
+ marker = loc + ssize - left;
/* Move the tail of @dst out of the way, then copy in @src. */
- ntfs_rl_mm(dst, magic, loc + right + 1, dsize - loc - right - 1);
+ ntfs_rl_mm(dst, marker, tail, dsize - tail);
ntfs_rl_mc(dst, loc, src, left, ssize - left);
- /* We may have changed the length of the file, so fix the end marker */
- if (dst[magic].lcn == LCN_ENOENT)
- dst[magic].vcn = dst[magic - 1].vcn + dst[magic - 1].length;
+ /* We may have changed the length of the file, so fix the end marker. */
+ if (dsize - tail > 0 && dst[marker].lcn == LCN_ENOENT)
+ dst[marker].vcn = dst[marker - 1].vcn + dst[marker - 1].length;
return dst;
}
-
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