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@ -1048,10 +1048,17 @@ static inline int ntfs_get_nr_significant_bytes(const s64 n)
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* ntfs_get_size_for_mapping_pairs - get bytes needed for mapping pairs array
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* @vol: ntfs volume (needed for the ntfs version)
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* @rl: locked runlist to determine the size of the mapping pairs of
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* @start_vcn: vcn at which to start the mapping pairs array
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* @first_vcn: first vcn which to include in the mapping pairs array
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* @last_vcn: last vcn which to include in the mapping pairs array
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*
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* Walk the locked runlist @rl and calculate the size in bytes of the mapping
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* pairs array corresponding to the runlist @rl, starting at vcn @start_vcn.
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* pairs array corresponding to the runlist @rl, starting at vcn @first_vcn and
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* finishing with vcn @last_vcn.
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*
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* A @last_vcn of -1 means end of runlist and in that case the size of the
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* mapping pairs array corresponding to the runlist starting at vcn @first_vcn
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* and finishing at the end of the runlist is determined.
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*
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* This for example allows us to allocate a buffer of the right size when
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* building the mapping pairs array.
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*
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@ -1067,34 +1074,50 @@ static inline int ntfs_get_nr_significant_bytes(const s64 n)
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* remains locked throughout, and is left locked upon return.
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*/
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int ntfs_get_size_for_mapping_pairs(const ntfs_volume *vol,
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const runlist_element *rl, const VCN start_vcn)
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const runlist_element *rl, const VCN first_vcn,
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const VCN last_vcn)
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{
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LCN prev_lcn;
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int rls;
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BOOL the_end = FALSE;
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BUG_ON(start_vcn < 0);
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BUG_ON(first_vcn < 0);
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BUG_ON(last_vcn < -1);
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BUG_ON(last_vcn >= 0 && first_vcn > last_vcn);
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if (!rl) {
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BUG_ON(start_vcn);
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BUG_ON(first_vcn);
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BUG_ON(last_vcn > 0);
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return 1;
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}
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/* Skip to runlist element containing @start_vcn. */
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while (rl->length && start_vcn >= rl[1].vcn)
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/* Skip to runlist element containing @first_vcn. */
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while (rl->length && first_vcn >= rl[1].vcn)
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rl++;
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if ((!rl->length && start_vcn > rl->vcn) || start_vcn < rl->vcn)
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if (unlikely((!rl->length && first_vcn > rl->vcn) ||
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first_vcn < rl->vcn))
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return -EINVAL;
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prev_lcn = 0;
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/* Always need the termining zero byte. */
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rls = 1;
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/* Do the first partial run if present. */
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if (start_vcn > rl->vcn) {
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s64 delta;
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if (first_vcn > rl->vcn) {
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s64 delta, length = rl->length;
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/* We know rl->length != 0 already. */
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if (rl->length < 0 || rl->lcn < LCN_HOLE)
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if (unlikely(length < 0 || rl->lcn < LCN_HOLE))
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goto err_out;
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delta = start_vcn - rl->vcn;
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/*
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* If @stop_vcn is given and finishes inside this run, cap the
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* run length.
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*/
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if (unlikely(last_vcn >= 0 && rl[1].vcn > last_vcn)) {
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s64 s1 = last_vcn + 1;
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if (unlikely(rl[1].vcn > s1))
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length = s1 - rl->vcn;
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the_end = TRUE;
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}
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delta = first_vcn - rl->vcn;
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/* Header byte + length. */
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rls += 1 + ntfs_get_nr_significant_bytes(rl->length - delta);
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rls += 1 + ntfs_get_nr_significant_bytes(length - delta);
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/*
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* If the logical cluster number (lcn) denotes a hole and we
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* are on NTFS 3.0+, we don't store it at all, i.e. we need
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@ -1102,9 +1125,9 @@ int ntfs_get_size_for_mapping_pairs(const ntfs_volume *vol,
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* Note: this assumes that on NTFS 1.2-, holes are stored with
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* an lcn of -1 and not a delta_lcn of -1 (unless both are -1).
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*/
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if (rl->lcn >= 0 || vol->major_ver < 3) {
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if (likely(rl->lcn >= 0 || vol->major_ver < 3)) {
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prev_lcn = rl->lcn;
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if (rl->lcn >= 0)
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if (likely(rl->lcn >= 0))
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prev_lcn += delta;
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/* Change in lcn. */
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rls += ntfs_get_nr_significant_bytes(prev_lcn);
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@ -1113,11 +1136,23 @@ int ntfs_get_size_for_mapping_pairs(const ntfs_volume *vol,
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rl++;
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}
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/* Do the full runs. */
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for (; rl->length; rl++) {
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if (rl->length < 0 || rl->lcn < LCN_HOLE)
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for (; rl->length && !the_end; rl++) {
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s64 length = rl->length;
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if (unlikely(length < 0 || rl->lcn < LCN_HOLE))
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goto err_out;
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/*
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* If @stop_vcn is given and finishes inside this run, cap the
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* run length.
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*/
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if (unlikely(last_vcn >= 0 && rl[1].vcn > last_vcn)) {
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s64 s1 = last_vcn + 1;
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if (unlikely(rl[1].vcn > s1))
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length = s1 - rl->vcn;
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the_end = TRUE;
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}
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/* Header byte + length. */
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rls += 1 + ntfs_get_nr_significant_bytes(rl->length);
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rls += 1 + ntfs_get_nr_significant_bytes(length);
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/*
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* If the logical cluster number (lcn) denotes a hole and we
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* are on NTFS 3.0+, we don't store it at all, i.e. we need
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@ -1125,7 +1160,7 @@ int ntfs_get_size_for_mapping_pairs(const ntfs_volume *vol,
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* Note: this assumes that on NTFS 1.2-, holes are stored with
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* an lcn of -1 and not a delta_lcn of -1 (unless both are -1).
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*/
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if (rl->lcn >= 0 || vol->major_ver < 3) {
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if (likely(rl->lcn >= 0 || vol->major_ver < 3)) {
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/* Change in lcn. */
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rls += ntfs_get_nr_significant_bytes(rl->lcn -
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prev_lcn);
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@ -1168,7 +1203,7 @@ static inline int ntfs_write_significant_bytes(s8 *dst, const s8 *dst_max,
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i = 0;
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do {
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if (dst > dst_max)
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if (unlikely(dst > dst_max))
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goto err_out;
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*dst++ = l & 0xffll;
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l >>= 8;
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@ -1177,12 +1212,12 @@ static inline int ntfs_write_significant_bytes(s8 *dst, const s8 *dst_max,
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j = (n >> 8 * (i - 1)) & 0xff;
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/* If the sign bit is wrong, we need an extra byte. */
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if (n < 0 && j >= 0) {
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if (dst > dst_max)
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if (unlikely(dst > dst_max))
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goto err_out;
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i++;
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*dst = (s8)-1;
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} else if (n > 0 && j < 0) {
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if (dst > dst_max)
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if (unlikely(dst > dst_max))
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goto err_out;
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i++;
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*dst = (s8)0;
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@ -1198,13 +1233,18 @@ err_out:
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* @dst: destination buffer to which to write the mapping pairs array
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* @dst_len: size of destination buffer @dst in bytes
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* @rl: locked runlist for which to build the mapping pairs array
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* @start_vcn: vcn at which to start the mapping pairs array
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* @first_vcn: first vcn which to include in the mapping pairs array
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* @last_vcn: last vcn which to include in the mapping pairs array
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* @stop_vcn: first vcn outside destination buffer on success or -ENOSPC
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*
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* Create the mapping pairs array from the locked runlist @rl, starting at vcn
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* @start_vcn and save the array in @dst. @dst_len is the size of @dst in
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* bytes and it should be at least equal to the value obtained by calling
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* ntfs_get_size_for_mapping_pairs().
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* @first_vcn and finishing with vcn @last_vcn and save the array in @dst.
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* @dst_len is the size of @dst in bytes and it should be at least equal to the
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* value obtained by calling ntfs_get_size_for_mapping_pairs().
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*
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* A @last_vcn of -1 means end of runlist and in that case the mapping pairs
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* array corresponding to the runlist starting at vcn @first_vcn and finishing
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* at the end of the runlist is created.
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*
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* If @rl is NULL, just write a single terminator byte to @dst.
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*
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@ -1213,7 +1253,7 @@ err_out:
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* been filled with all the mapping pairs that will fit, thus it can be treated
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* as partial success, in that a new attribute extent needs to be created or
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* the next extent has to be used and the mapping pairs build has to be
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* continued with @start_vcn set to *@stop_vcn.
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* continued with @first_vcn set to *@stop_vcn.
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*
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* Return 0 on success and -errno on error. The following error codes are
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* defined:
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@ -1227,27 +1267,32 @@ err_out:
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*/
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int ntfs_mapping_pairs_build(const ntfs_volume *vol, s8 *dst,
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const int dst_len, const runlist_element *rl,
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const VCN start_vcn, VCN *const stop_vcn)
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const VCN first_vcn, const VCN last_vcn, VCN *const stop_vcn)
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{
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LCN prev_lcn;
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s8 *dst_max, *dst_next;
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int err = -ENOSPC;
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BOOL the_end = FALSE;
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s8 len_len, lcn_len;
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BUG_ON(start_vcn < 0);
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BUG_ON(first_vcn < 0);
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BUG_ON(last_vcn < -1);
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BUG_ON(last_vcn >= 0 && first_vcn > last_vcn);
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BUG_ON(dst_len < 1);
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if (!rl) {
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BUG_ON(start_vcn);
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BUG_ON(first_vcn);
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BUG_ON(last_vcn > 0);
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if (stop_vcn)
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*stop_vcn = 0;
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/* Terminator byte. */
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*dst = 0;
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return 0;
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}
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/* Skip to runlist element containing @start_vcn. */
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while (rl->length && start_vcn >= rl[1].vcn)
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/* Skip to runlist element containing @first_vcn. */
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while (rl->length && first_vcn >= rl[1].vcn)
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rl++;
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if ((!rl->length && start_vcn > rl->vcn) || start_vcn < rl->vcn)
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if (unlikely((!rl->length && first_vcn > rl->vcn) ||
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first_vcn < rl->vcn))
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return -EINVAL;
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/*
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* @dst_max is used for bounds checking in
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@ -1256,17 +1301,27 @@ int ntfs_mapping_pairs_build(const ntfs_volume *vol, s8 *dst,
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dst_max = dst + dst_len - 1;
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prev_lcn = 0;
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/* Do the first partial run if present. */
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if (start_vcn > rl->vcn) {
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s64 delta;
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if (first_vcn > rl->vcn) {
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s64 delta, length = rl->length;
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/* We know rl->length != 0 already. */
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if (rl->length < 0 || rl->lcn < LCN_HOLE)
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if (unlikely(length < 0 || rl->lcn < LCN_HOLE))
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goto err_out;
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delta = start_vcn - rl->vcn;
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/*
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* If @stop_vcn is given and finishes inside this run, cap the
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* run length.
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*/
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if (unlikely(last_vcn >= 0 && rl[1].vcn > last_vcn)) {
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s64 s1 = last_vcn + 1;
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if (unlikely(rl[1].vcn > s1))
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length = s1 - rl->vcn;
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the_end = TRUE;
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}
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delta = first_vcn - rl->vcn;
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/* Write length. */
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len_len = ntfs_write_significant_bytes(dst + 1, dst_max,
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rl->length - delta);
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if (len_len < 0)
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length - delta);
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if (unlikely(len_len < 0))
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goto size_err;
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/*
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* If the logical cluster number (lcn) denotes a hole and we
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@ -1277,19 +1332,19 @@ int ntfs_mapping_pairs_build(const ntfs_volume *vol, s8 *dst,
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* case on NT4. - We assume that we just need to write the lcn
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* change until someone tells us otherwise... (AIA)
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*/
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if (rl->lcn >= 0 || vol->major_ver < 3) {
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if (likely(rl->lcn >= 0 || vol->major_ver < 3)) {
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prev_lcn = rl->lcn;
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if (rl->lcn >= 0)
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if (likely(rl->lcn >= 0))
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prev_lcn += delta;
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/* Write change in lcn. */
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lcn_len = ntfs_write_significant_bytes(dst + 1 +
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len_len, dst_max, prev_lcn);
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if (lcn_len < 0)
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if (unlikely(lcn_len < 0))
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goto size_err;
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} else
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lcn_len = 0;
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dst_next = dst + len_len + lcn_len + 1;
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if (dst_next > dst_max)
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if (unlikely(dst_next > dst_max))
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goto size_err;
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/* Update header byte. */
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|
*dst = lcn_len << 4 | len_len;
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@ -1299,13 +1354,25 @@ int ntfs_mapping_pairs_build(const ntfs_volume *vol, s8 *dst,
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rl++;
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}
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/* Do the full runs. */
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for (; rl->length; rl++) {
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if (rl->length < 0 || rl->lcn < LCN_HOLE)
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for (; rl->length && !the_end; rl++) {
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s64 length = rl->length;
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if (unlikely(length < 0 || rl->lcn < LCN_HOLE))
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goto err_out;
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/*
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* If @stop_vcn is given and finishes inside this run, cap the
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* run length.
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*/
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if (unlikely(last_vcn >= 0 && rl[1].vcn > last_vcn)) {
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s64 s1 = last_vcn + 1;
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if (unlikely(rl[1].vcn > s1))
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length = s1 - rl->vcn;
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the_end = TRUE;
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}
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/* Write length. */
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len_len = ntfs_write_significant_bytes(dst + 1, dst_max,
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rl->length);
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if (len_len < 0)
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length);
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if (unlikely(len_len < 0))
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goto size_err;
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/*
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* If the logical cluster number (lcn) denotes a hole and we
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@ -1316,17 +1383,17 @@ int ntfs_mapping_pairs_build(const ntfs_volume *vol, s8 *dst,
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* case on NT4. - We assume that we just need to write the lcn
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* change until someone tells us otherwise... (AIA)
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*/
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if (rl->lcn >= 0 || vol->major_ver < 3) {
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if (likely(rl->lcn >= 0 || vol->major_ver < 3)) {
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/* Write change in lcn. */
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lcn_len = ntfs_write_significant_bytes(dst + 1 +
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len_len, dst_max, rl->lcn - prev_lcn);
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if (lcn_len < 0)
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if (unlikely(lcn_len < 0))
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goto size_err;
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prev_lcn = rl->lcn;
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} else
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lcn_len = 0;
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dst_next = dst + len_len + lcn_len + 1;
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if (dst_next > dst_max)
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if (unlikely(dst_next > dst_max))
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goto size_err;
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/* Update header byte. */
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*dst = lcn_len << 4 | len_len;
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