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Diffstat (limited to 'usr/src/lib/libntfs/common/libntfs/lcnalloc.c')
-rw-r--r--usr/src/lib/libntfs/common/libntfs/lcnalloc.c858
1 files changed, 0 insertions, 858 deletions
diff --git a/usr/src/lib/libntfs/common/libntfs/lcnalloc.c b/usr/src/lib/libntfs/common/libntfs/lcnalloc.c
deleted file mode 100644
index 7f42f8a564..0000000000
--- a/usr/src/lib/libntfs/common/libntfs/lcnalloc.c
+++ /dev/null
@@ -1,858 +0,0 @@
-/**
- * lcnalloc.c - Cluster (de)allocation code. Part of the Linux-NTFS project.
- *
- * Copyright (c) 2002-2004 Anton Altaparmakov
- * Copyright (c) 2004 Yura Pakhuchiy
- *
- * 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
- * by the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program/include file is distributed in the hope that it will be
- * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program (in the main directory of the Linux-NTFS
- * distribution in the file COPYING); if not, write to the Free Software
- * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#ifdef HAVE_STDLIB_H
-#include <stdlib.h>
-#endif
-#ifdef HAVE_STDIO_H
-#include <stdio.h>
-#endif
-#ifdef HAVE_ERRNO_H
-#include <errno.h>
-#endif
-
-#include "compat.h"
-#include "types.h"
-#include "attrib.h"
-#include "bitmap.h"
-#include "debug.h"
-#include "runlist.h"
-#include "volume.h"
-#include "lcnalloc.h"
-#include "logging.h"
-
-/**
- * ntfs_cluster_alloc - allocate clusters on an ntfs volume
- * @vol: mounted ntfs volume on which to allocate the clusters
- * @start_vcn: vcn to use for the first allocated cluster
- * @count: number of clusters to allocate
- * @start_lcn: starting lcn at which to allocate the clusters (or -1 if none)
- * @zone: zone from which to allocate the clusters
- *
- * Allocate @count clusters preferably starting at cluster @start_lcn or at the
- * current allocator position if @start_lcn is -1, on the mounted ntfs volume
- * @vol. @zone is either DATA_ZONE for allocation of normal clusters and
- * MFT_ZONE for allocation of clusters for the master file table, i.e. the
- * $MFT/$DATA attribute.
- *
- * On success return a runlist describing the allocated cluster(s).
- *
- * On error return NULL with errno set to the error code.
- *
- * Notes on the allocation algorithm
- * =================================
- *
- * There are two data zones. First is the area between the end of the mft zone
- * and the end of the volume, and second is the area between the start of the
- * volume and the start of the mft zone. On unmodified/standard NTFS 1.x
- * volumes, the second data zone doesn't exist due to the mft zone being
- * expanded to cover the start of the volume in order to reserve space for the
- * mft bitmap attribute.
- *
- * This is not the prettiest function but the complexity stems from the need of
- * implementing the mft vs data zoned approach and from the fact that we have
- * access to the lcn bitmap in portions of up to 8192 bytes at a time, so we
- * need to cope with crossing over boundaries of two buffers. Further, the fact
- * that the allocator allows for caller supplied hints as to the location of
- * where allocation should begin and the fact that the allocator keeps track of
- * where in the data zones the next natural allocation should occur, contribute
- * to the complexity of the function. But it should all be worthwhile, because
- * this allocator should: 1) be a full implementation of the MFT zone approach
- * used by Windows, 2) cause reduction in fragmentation as much as possible,
- * and 3) be speedy in allocations (the code is not optimized for speed, but
- * the algorithm is, so further speed improvements are probably possible).
- *
- * FIXME: We should be monitoring cluster allocation and increment the MFT zone
- * size dynamically but this is something for the future. We will just cause
- * heavier fragmentation by not doing it and I am not even sure Windows would
- * grow the MFT zone dynamically, so it might even be correct not to do this.
- * The overhead in doing dynamic MFT zone expansion would be very large and
- * unlikely worth the effort. (AIA)
- *
- * TODO: I have added in double the required zone position pointer wrap around
- * logic which can be optimized to having only one of the two logic sets.
- * However, having the double logic will work fine, but if we have only one of
- * the sets and we get it wrong somewhere, then we get into trouble, so
- * removing the duplicate logic requires _very_ careful consideration of _all_
- * possible code paths. So at least for now, I am leaving the double logic -
- * better safe than sorry... (AIA)
- */
-runlist *ntfs_cluster_alloc(ntfs_volume *vol, VCN start_vcn, s64 count,
- LCN start_lcn, const NTFS_CLUSTER_ALLOCATION_ZONES zone)
-{
- LCN zone_start, zone_end, bmp_pos, bmp_initial_pos, last_read_pos, lcn;
- LCN prev_lcn = 0, prev_run_len = 0, mft_zone_size;
- s64 clusters, br;
- runlist *rl = NULL, *trl;
- u8 *buf, *byte;
- int err = 0, rlpos, rlsize, buf_size;
- u8 pass, done_zones, search_zone, need_writeback, bit;
-
- ntfs_log_trace("Entering with count = 0x%llx, start_lcn = 0x%llx, zone = "
- "%s_ZONE.\n", (long long)count, (long long)start_lcn,
- zone == MFT_ZONE ? "MFT" : "DATA");
- if (!vol || count < 0 || start_lcn < -1 || !vol->lcnbmp_na ||
- (s8)zone < FIRST_ZONE || zone > LAST_ZONE) {
- ntfs_log_trace("Invalid arguments!\n");
- errno = EINVAL;
- return NULL;
- }
-
- /* Return empty runlist if @count == 0 */
- if (!count) {
- rl = ntfs_malloc(0x1000);
- if (!rl)
- return NULL;
- rl[0].vcn = start_vcn;
- rl[0].lcn = LCN_RL_NOT_MAPPED;
- rl[0].length = 0;
- return rl;
- }
-
- /* Allocate memory. */
- buf = (u8*)ntfs_malloc(8192);
- if (!buf)
- return NULL;
- /*
- * If no specific @start_lcn was requested, use the current data zone
- * position, otherwise use the requested @start_lcn but make sure it
- * lies outside the mft zone. Also set done_zones to 0 (no zones done)
- * and pass depending on whether we are starting inside a zone (1) or
- * at the beginning of a zone (2). If requesting from the MFT_ZONE,
- * we either start at the current position within the mft zone or at
- * the specified position. If the latter is out of bounds then we start
- * at the beginning of the MFT_ZONE.
- */
- done_zones = 0;
- pass = 1;
- /*
- * zone_start and zone_end are the current search range. search_zone
- * is 1 for mft zone, 2 for data zone 1 (end of mft zone till end of
- * volume) and 4 for data zone 2 (start of volume till start of mft
- * zone).
- */
- zone_start = start_lcn;
- if (zone_start < 0) {
- if (zone == DATA_ZONE)
- zone_start = vol->data1_zone_pos;
- else
- zone_start = vol->mft_zone_pos;
- if (!zone_start) {
- /*
- * Zone starts at beginning of volume which means a
- * single pass is sufficient.
- */
- pass = 2;
- }
- } else if (zone == DATA_ZONE && zone_start >= vol->mft_zone_start &&
- zone_start < vol->mft_zone_end) {
- zone_start = vol->mft_zone_end;
- /*
- * Starting at beginning of data1_zone which means a single
- * pass in this zone is sufficient.
- */
- pass = 2;
- } else if (zone == MFT_ZONE && (zone_start < vol->mft_zone_start ||
- zone_start >= vol->mft_zone_end)) {
- zone_start = vol->mft_lcn;
- if (!vol->mft_zone_end)
- zone_start = 0;
- /*
- * Starting at beginning of volume which means a single pass
- * is sufficient.
- */
- pass = 2;
- }
- if (zone == MFT_ZONE) {
- zone_end = vol->mft_zone_end;
- search_zone = 1;
- } else /* if (zone == DATA_ZONE) */ {
- /* Skip searching the mft zone. */
- done_zones |= 1;
- if (zone_start >= vol->mft_zone_end) {
- zone_end = vol->nr_clusters;
- search_zone = 2;
- } else {
- zone_end = vol->mft_zone_start;
- search_zone = 4;
- }
- }
- /*
- * bmp_pos is the current bit position inside the bitmap. We use
- * bmp_initial_pos to determine whether or not to do a zone switch.
- */
- bmp_pos = bmp_initial_pos = zone_start;
-
- /* Loop until all clusters are allocated, i.e. clusters == 0. */
- clusters = count;
- rlpos = rlsize = 0;
- while (1) {
- ntfs_log_trace("Start of outer while loop: done_zones = 0x%x, "
- "search_zone = %i, pass = %i, zone_start = "
- "0x%llx, zone_end = 0x%llx, bmp_initial_pos = "
- "0x%llx, bmp_pos = 0x%llx, rlpos = %i, rlsize = "
- "%i.\n", done_zones, search_zone, pass,
- (long long)zone_start, (long long)zone_end,
- (long long)bmp_initial_pos, (long long)bmp_pos,
- rlpos, rlsize);
- /* Loop until we run out of free clusters. */
- last_read_pos = bmp_pos >> 3;
- ntfs_log_trace("last_read_pos = 0x%llx.\n", (long long)last_read_pos);
- br = ntfs_attr_pread(vol->lcnbmp_na, last_read_pos, 8192, buf);
- if (br <= 0) {
- if (!br) {
- /* Reached end of attribute. */
- ntfs_log_trace("End of attribute reached. Skipping "
- "to zone_pass_done.\n");
- goto zone_pass_done;
- }
- err = errno;
- ntfs_log_trace("ntfs_attr_pread() failed. Aborting.\n");
- goto err_ret;
- }
- /*
- * We might have read less than 8192 bytes if we are close to
- * the end of the attribute.
- */
- buf_size = (int)br << 3;
- lcn = bmp_pos & 7;
- bmp_pos &= ~7;
- need_writeback = 0;
- ntfs_log_trace("Before inner while loop: buf_size = %i, lcn = "
- "0x%llx, bmp_pos = 0x%llx, need_writeback = %i.\n",
- buf_size, (long long)lcn, (long long)bmp_pos,
- need_writeback);
- while (lcn < buf_size && lcn + bmp_pos < zone_end) {
- byte = buf + (lcn >> 3);
- ntfs_log_trace("In inner while loop: buf_size = %i, lcn = "
- "0x%llx, bmp_pos = 0x%llx, "
- "need_writeback = %i, byte ofs = 0x%x, "
- "*byte = 0x%x.\n", buf_size,
- (long long)lcn, (long long)bmp_pos,
- need_writeback, (unsigned int)(lcn >> 3),
- (unsigned int)*byte);
- /* Skip full bytes. */
- if (*byte == 0xff) {
- lcn = (lcn + 8) & ~7;
- ntfs_log_trace("continuing while loop 1.\n");
- continue;
- }
- bit = 1 << (lcn & 7);
- ntfs_log_trace("bit = %i.\n", bit);
- /* If the bit is already set, go onto the next one. */
- if (*byte & bit) {
- lcn++;
- ntfs_log_trace("continuing while loop 2.\n");
- continue;
- }
- /* Reallocate memory if necessary. */
- if ((rlpos + 2) * (int)sizeof(runlist) >= rlsize) {
- ntfs_log_trace("Reallocating space.\n");
- if (!rl)
- ntfs_log_trace("First free bit is at LCN = "
- "0x%llx.\n", (long long)(lcn + bmp_pos));
- rlsize += 4096;
- trl = (runlist*)realloc(rl, rlsize);
- if (!trl) {
- err = ENOMEM;
- ntfs_log_trace("Failed to allocate memory, "
- "going to wb_err_ret.\n");
- goto wb_err_ret;
- }
- rl = trl;
- ntfs_log_trace("Reallocated memory, rlsize = "
- "0x%x.\n", rlsize);
- }
- /* Allocate the bitmap bit. */
- *byte |= bit;
- vol->nr_free_clusters--;
- /* We need to write this bitmap buffer back to disk! */
- need_writeback = 1;
- ntfs_log_trace("*byte = 0x%x, need_writeback is set.\n",
- (unsigned int)*byte);
- /*
- * Coalesce with previous run if adjacent LCNs.
- * Otherwise, append a new run.
- */
- ntfs_log_trace("Adding run (lcn 0x%llx, len 0x%llx), "
- "prev_lcn = 0x%llx, lcn = 0x%llx, "
- "bmp_pos = 0x%llx, prev_run_len = "
- "0x%llx, rlpos = %i.\n",
- (long long)(lcn + bmp_pos), 1LL,
- (long long)prev_lcn, (long long)lcn,
- (long long)bmp_pos,
- (long long)prev_run_len, rlpos);
- if (prev_lcn == lcn + bmp_pos - prev_run_len && rlpos) {
- ntfs_log_trace("Coalescing to run (lcn 0x%llx, len "
- "0x%llx).\n",
- (long long)rl[rlpos - 1].lcn,
- (long long) rl[rlpos - 1].length);
- rl[rlpos - 1].length = ++prev_run_len;
- ntfs_log_trace("Run now (lcn 0x%llx, len 0x%llx), "
- "prev_run_len = 0x%llx.\n",
- (long long)rl[rlpos - 1].lcn,
- (long long)rl[rlpos - 1].length,
- (long long)prev_run_len);
- } else {
- if (rlpos) {
- ntfs_log_trace("Adding new run, (previous "
- "run lcn 0x%llx, len 0x%llx).\n",
- (long long) rl[rlpos - 1].lcn,
- (long long) rl[rlpos - 1].length);
- rl[rlpos].vcn = rl[rlpos - 1].vcn +
- prev_run_len;
- } else {
- ntfs_log_trace("Adding new run, is first run.\n");
- rl[rlpos].vcn = start_vcn;
- }
- rl[rlpos].lcn = prev_lcn = lcn + bmp_pos;
- rl[rlpos].length = prev_run_len = 1;
- rlpos++;
- }
- /* Done? */
- if (!--clusters) {
- LCN tc;
- /*
- * Update the current zone position. Positions
- * of already scanned zones have been updated
- * during the respective zone switches.
- */
- tc = lcn + bmp_pos + 1;
- ntfs_log_trace("Done. Updating current zone "
- "position, tc = 0x%llx, search_zone = %i.\n",
- (long long)tc, search_zone);
- switch (search_zone) {
- case 1:
- ntfs_log_trace("Before checks, vol->mft_zone_pos = 0x%llx.\n",
- (long long) vol->mft_zone_pos);
- if (tc >= vol->mft_zone_end) {
- vol->mft_zone_pos =
- vol->mft_lcn;
- if (!vol->mft_zone_end)
- vol->mft_zone_pos = 0;
- } else if ((bmp_initial_pos >=
- vol->mft_zone_pos ||
- tc > vol->mft_zone_pos)
- && tc >= vol->mft_lcn)
- vol->mft_zone_pos = tc;
- ntfs_log_trace("After checks, vol->mft_zone_pos = 0x%llx.\n",
- (long long) vol->mft_zone_pos);
- break;
- case 2:
- ntfs_log_trace("Before checks, vol->data1_zone_pos = 0x%llx.\n",
- (long long) vol->data1_zone_pos);
- if (tc >= vol->nr_clusters)
- vol->data1_zone_pos =
- vol->mft_zone_end;
- else if ((bmp_initial_pos >=
- vol->data1_zone_pos ||
- tc > vol->data1_zone_pos)
- && tc >= vol->mft_zone_end)
- vol->data1_zone_pos = tc;
- ntfs_log_trace("After checks, vol->data1_zone_pos = 0x%llx.\n",
- (long long) vol->data1_zone_pos);
- break;
- case 4:
- ntfs_log_trace("Before checks, vol->data2_zone_pos = 0x%llx.\n",
- (long long) vol->data2_zone_pos);
- if (tc >= vol->mft_zone_start)
- vol->data2_zone_pos = 0;
- else if (bmp_initial_pos >=
- vol->data2_zone_pos ||
- tc > vol->data2_zone_pos)
- vol->data2_zone_pos = tc;
- ntfs_log_trace("After checks, vol->data2_zone_pos = 0x%llx.\n",
- (long long) vol->data2_zone_pos);
- break;
- default:
- free(rl);
- free(buf);
- NTFS_BUG("switch (search_zone) 1");
- return NULL;
- }
- ntfs_log_trace("Going to done_ret.\n");
- goto done_ret;
- }
- lcn++;
- }
- bmp_pos += buf_size;
- ntfs_log_trace("After inner while loop: buf_size = 0x%x, lcn = "
- "0x%llx, bmp_pos = 0x%llx, need_writeback = %i.\n",
- buf_size, (long long)lcn,
- (long long)bmp_pos, need_writeback);
- if (need_writeback) {
- s64 bw;
- ntfs_log_trace("Writing back.\n");
- need_writeback = 0;
- bw = ntfs_attr_pwrite(vol->lcnbmp_na, last_read_pos,
- br, buf);
- if (bw != br) {
- if (bw == -1)
- err = errno;
- else
- err = EIO;
- ntfs_log_trace("Bitmap writeback failed in read next "
- "buffer code path with error code %i.\n", err);
- goto err_ret;
- }
- }
- if (bmp_pos < zone_end) {
- ntfs_log_trace("Continuing outer while loop, bmp_pos = "
- "0x%llx, zone_end = 0x%llx.\n",
- (long long)bmp_pos,
- (long long)zone_end);
- continue;
- }
-zone_pass_done: /* Finished with the current zone pass. */
- ntfs_log_trace("At zone_pass_done, pass = %i.\n", pass);
- if (pass == 1) {
- /*
- * Now do pass 2, scanning the first part of the zone
- * we omitted in pass 1.
- */
- pass = 2;
- zone_end = zone_start;
- switch (search_zone) {
- case 1: /* mft_zone */
- zone_start = vol->mft_zone_start;
- break;
- case 2: /* data1_zone */
- zone_start = vol->mft_zone_end;
- break;
- case 4: /* data2_zone */
- zone_start = 0;
- break;
- default:
- NTFS_BUG("switch (search_zone) 2");
- }
- /* Sanity check. */
- if (zone_end < zone_start)
- zone_end = zone_start;
- bmp_pos = zone_start;
- ntfs_log_trace("Continuing outer while loop, pass = 2, "
- "zone_start = 0x%llx, zone_end = "
- "0x%llx, bmp_pos = 0x%llx.\n",
- zone_start, zone_end, bmp_pos);
- continue;
- } /* pass == 2 */
-done_zones_check:
- ntfs_log_trace("At done_zones_check, search_zone = %i, done_zones "
- "before = 0x%x, done_zones after = 0x%x.\n",
- search_zone, done_zones, done_zones | search_zone);
- done_zones |= search_zone;
- if (done_zones < 7) {
- ntfs_log_trace("Switching zone.\n");
- /* Now switch to the next zone we haven't done yet. */
- pass = 1;
- switch (search_zone) {
- case 1:
- ntfs_log_trace("Switching from mft zone to data1 "
- "zone.\n");
- /* Update mft zone position. */
- if (rlpos) {
- LCN tc;
- ntfs_log_trace("Before checks, vol->mft_zone_pos = 0x%llx.\n",
- (long long) vol->mft_zone_pos);
- tc = rl[rlpos - 1].lcn +
- rl[rlpos - 1].length;
- if (tc >= vol->mft_zone_end) {
- vol->mft_zone_pos =
- vol->mft_lcn;
- if (!vol->mft_zone_end)
- vol->mft_zone_pos = 0;
- } else if ((bmp_initial_pos >=
- vol->mft_zone_pos ||
- tc > vol->mft_zone_pos)
- && tc >= vol->mft_lcn)
- vol->mft_zone_pos = tc;
- ntfs_log_trace("After checks, vol->mft_zone_pos = 0x%llx.\n",
- (long long) vol->mft_zone_pos);
- }
- /* Switch from mft zone to data1 zone. */
-switch_to_data1_zone: search_zone = 2;
- zone_start = bmp_initial_pos =
- vol->data1_zone_pos;
- zone_end = vol->nr_clusters;
- if (zone_start == vol->mft_zone_end)
- pass = 2;
- if (zone_start >= zone_end) {
- vol->data1_zone_pos = zone_start =
- vol->mft_zone_end;
- pass = 2;
- }
- break;
- case 2:
- ntfs_log_trace("Switching from data1 zone to data2 "
- "zone.\n");
- /* Update data1 zone position. */
- if (rlpos) {
- LCN tc;
- ntfs_log_trace("Before checks, vol->data1_zone_pos = 0x%llx.\n",
- (long long) vol->data1_zone_pos);
- tc = rl[rlpos - 1].lcn +
- rl[rlpos - 1].length;
- if (tc >= vol->nr_clusters)
- vol->data1_zone_pos =
- vol->mft_zone_end;
- else if ((bmp_initial_pos >=
- vol->data1_zone_pos ||
- tc > vol->data1_zone_pos)
- && tc >= vol->mft_zone_end)
- vol->data1_zone_pos = tc;
- ntfs_log_trace("After checks, vol->data1_zone_pos = 0x%llx.\n",
- (long long) vol->data1_zone_pos);
- }
- /* Switch from data1 zone to data2 zone. */
- search_zone = 4;
- zone_start = bmp_initial_pos =
- vol->data2_zone_pos;
- zone_end = vol->mft_zone_start;
- if (!zone_start)
- pass = 2;
- if (zone_start >= zone_end) {
- vol->data2_zone_pos = zone_start =
- bmp_initial_pos = 0;
- pass = 2;
- }
- break;
- case 4:
- ntfs_log_debug("Switching from data2 zone to data1 "
- "zone.\n");
- /* Update data2 zone position. */
- if (rlpos) {
- LCN tc;
- ntfs_log_trace("Before checks, vol->data2_zone_pos = 0x%llx.\n",
- (long long) vol->data2_zone_pos);
- tc = rl[rlpos - 1].lcn +
- rl[rlpos - 1].length;
- if (tc >= vol->mft_zone_start)
- vol->data2_zone_pos = 0;
- else if (bmp_initial_pos >=
- vol->data2_zone_pos ||
- tc > vol->data2_zone_pos)
- vol->data2_zone_pos = tc;
- ntfs_log_trace("After checks, vol->data2_zone_pos = 0x%llx.\n",
- (long long) vol->data2_zone_pos);
- }
- /* Switch from data2 zone to data1 zone. */
- goto switch_to_data1_zone; /* See above. */
- default:
- NTFS_BUG("switch (search_zone) 3");
- }
- ntfs_log_trace("After zone switch, search_zone = %i, pass = "
- "%i, bmp_initial_pos = 0x%llx, "
- "zone_start = 0x%llx, zone_end = "
- "0x%llx.\n", search_zone, pass,
- (long long)bmp_initial_pos,
- (long long)zone_start,
- (long long)zone_end);
- bmp_pos = zone_start;
- if (zone_start == zone_end) {
- ntfs_log_trace("Empty zone, going to "
- "done_zones_check.\n");
- /* Empty zone. Don't bother searching it. */
- goto done_zones_check;
- }
- ntfs_log_trace("Continuing outer while loop.\n");
- continue;
- } /* done_zones == 7 */
- ntfs_log_trace("All zones are finished.\n");
- /*
- * All zones are finished! If DATA_ZONE, shrink mft zone. If
- * MFT_ZONE, we have really run out of space.
- */
- mft_zone_size = vol->mft_zone_end - vol->mft_zone_start;
- ntfs_log_trace("vol->mft_zone_start = 0x%llx, vol->mft_zone_end = "
- "0x%llx, mft_zone_size = 0x%llx.\n",
- (long long)vol->mft_zone_start,
- (long long)vol->mft_zone_end,
- (long long)mft_zone_size);
- if (zone == MFT_ZONE || mft_zone_size <= 0) {
- ntfs_log_trace("No free clusters left, going to err_ret.\n");
- /* Really no more space left on device. */
- err = ENOSPC;
- goto err_ret;
- } /* zone == DATA_ZONE && mft_zone_size > 0 */
- ntfs_log_trace("Shrinking mft zone.\n");
- zone_end = vol->mft_zone_end;
- mft_zone_size >>= 1;
- if (mft_zone_size > 0)
- vol->mft_zone_end = vol->mft_zone_start + mft_zone_size;
- else /* mft zone and data2 zone no longer exist. */
- vol->data2_zone_pos = vol->mft_zone_start =
- vol->mft_zone_end = 0;
- if (vol->mft_zone_pos >= vol->mft_zone_end) {
- vol->mft_zone_pos = vol->mft_lcn;
- if (!vol->mft_zone_end)
- vol->mft_zone_pos = 0;
- }
- bmp_pos = zone_start = bmp_initial_pos =
- vol->data1_zone_pos = vol->mft_zone_end;
- search_zone = 2;
- pass = 2;
- done_zones &= ~2;
- ntfs_log_trace("After shrinking mft zone, mft_zone_size = 0x%llx, "
- "vol->mft_zone_start = 0x%llx, "
- "vol->mft_zone_end = 0x%llx, vol->mft_zone_pos "
- "= 0x%llx, search_zone = 2, pass = 2, "
- "dones_zones = 0x%x, zone_start = 0x%llx, "
- "zone_end = 0x%llx, vol->data1_zone_pos = "
- "0x%llx, continuing outer while loop.\n",
- (long long)mft_zone_size,
- (long long)vol->mft_zone_start,
- (long long)vol->mft_zone_end,
- (long long)vol->mft_zone_pos,
- done_zones,
- (long long)zone_start,
- (long long)zone_end,
- (long long)vol->data1_zone_pos);
- }
- ntfs_log_debug("After outer while loop.\n");
-done_ret:
- ntfs_log_debug("At done_ret.\n");
- /* Add runlist terminator element. */
- rl[rlpos].vcn = rl[rlpos - 1].vcn + rl[rlpos - 1].length;
- rl[rlpos].lcn = LCN_RL_NOT_MAPPED;
- rl[rlpos].length = 0;
- if (need_writeback) {
- s64 bw;
- ntfs_log_trace("Writing back.\n");
- need_writeback = 0;
- bw = ntfs_attr_pwrite(vol->lcnbmp_na, last_read_pos, br, buf);
- if (bw != br) {
- if (bw < 0)
- err = errno;
- else
- err = EIO;
- ntfs_log_trace("Bitmap writeback failed in done code path "
- "with error code %i.\n", err);
- goto err_ret;
- }
- }
-done_err_ret:
- ntfs_log_debug("At done_err_ret (follows done_ret).\n");
- free(buf);
- /* Done! */
- if (!err)
- return rl;
- ntfs_log_trace("Failed to allocate clusters. Returning with error code "
- "%i.\n", err);
- errno = err;
- return NULL;
-wb_err_ret:
- ntfs_log_trace("At wb_err_ret.\n");
- if (need_writeback) {
- s64 bw;
- ntfs_log_trace("Writing back.\n");
- need_writeback = 0;
- bw = ntfs_attr_pwrite(vol->lcnbmp_na, last_read_pos, br, buf);
- if (bw != br) {
- if (bw < 0)
- err = errno;
- else
- err = EIO;
- ntfs_log_trace("Bitmap writeback failed in error code path "
- "with error code %i.\n", err);
- }
- }
-err_ret:
- ntfs_log_trace("At err_ret.\n");
- if (rl) {
- if (err == ENOSPC) {
- ntfs_log_trace("err = ENOSPC, first free lcn = 0x%llx, could "
- "allocate up to = 0x%llx clusters.\n",
- (long long)rl[0].lcn,
- (long long)count - clusters);
- }
- /* Add runlist terminator element. */
- rl[rlpos].vcn = rl[rlpos - 1].vcn + rl[rlpos - 1].length;
- rl[rlpos].lcn = LCN_RL_NOT_MAPPED;
- rl[rlpos].length = 0;
- /* Deallocate all allocated clusters. */
- ntfs_log_trace("Deallocating allocated clusters.\n");
- ntfs_cluster_free_from_rl(vol, rl);
- /* Free the runlist. */
- free(rl);
- rl = NULL;
- } else {
- if (err == ENOSPC) {
- ntfs_log_trace("No space left at all, err = ENOSPC, first "
- "free lcn = 0x%llx.\n",
- (long long)vol->data1_zone_pos);
- }
- }
- ntfs_log_trace("rl = NULL, going to done_err_ret.\n");
- goto done_err_ret;
-}
-
-/**
- * ntfs_cluster_free_from_rl - free clusters from runlist
- * @vol: mounted ntfs volume on which to free the clusters
- * @rl: runlist from which deallocate clusters
- *
- * On success return 0 and on error return -1 with errno set to the error code.
- */
-int ntfs_cluster_free_from_rl(ntfs_volume *vol, runlist *rl)
-{
- ntfs_log_trace("Entering.\n");
-
- for (; rl->length; rl++) {
-
- ntfs_log_trace("Dealloc lcn 0x%llx, len 0x%llx.\n",
- (long long)rl->lcn, (long long)rl->length);
-
- if (rl->lcn >= 0 && ntfs_bitmap_clear_run(vol->lcnbmp_na,
- rl->lcn, rl->length)) {
- int eo = errno;
- ntfs_log_trace("Eeek! Deallocation of clusters failed.\n");
- errno = eo;
- return -1;
- }
- }
- return 0;
-}
-
-/**
- * ntfs_cluster_free - free clusters on an ntfs volume
- * @vol: mounted ntfs volume on which to free the clusters
- * @na: attribute whose runlist describes the clusters to free
- * @start_vcn: vcn in @rl at which to start freeing clusters
- * @count: number of clusters to free or -1 for all clusters
- *
- * Free @count clusters starting at the cluster @start_vcn in the runlist
- * described by the attribute @na from the mounted ntfs volume @vol.
- *
- * If @count is -1, all clusters from @start_vcn to the end of the runlist
- * are deallocated.
- *
- * On success return the number of deallocated clusters (not counting sparse
- * clusters) and on error return -1 with errno set to the error code.
- */
-int ntfs_cluster_free(ntfs_volume *vol, ntfs_attr *na, VCN start_vcn, s64 count)
-{
- runlist *rl;
- s64 nr_freed, delta, to_free;
-
- if (!vol || !vol->lcnbmp_na || !na || start_vcn < 0 ||
- (count < 0 && count != -1)) {
- ntfs_log_trace("Invalid arguments!\n");
- errno = EINVAL;
- return -1;
- }
- ntfs_log_trace("Entering for inode 0x%llx, attr 0x%x, count 0x%llx, "
- "vcn 0x%llx.\n", (unsigned long long)na->ni->mft_no,
- na->type, (long long)count, (long long)start_vcn);
-
- rl = ntfs_attr_find_vcn(na, start_vcn);
- if (!rl) {
- if (errno == ENOENT)
- return 0;
- else
- return -1;
- }
-
- if (rl->lcn < 0 && rl->lcn != LCN_HOLE) {
- errno = EIO;
- return -1;
- }
-
- /* Find the starting cluster inside the run that needs freeing. */
- delta = start_vcn - rl->vcn;
-
- /* The number of clusters in this run that need freeing. */
- to_free = rl->length - delta;
- if (count >= 0 && to_free > count)
- to_free = count;
-
- if (rl->lcn != LCN_HOLE) {
- /* Do the actual freeing of the clusters in this run. */
- if (ntfs_bitmap_clear_run(vol->lcnbmp_na, rl->lcn + delta,
- to_free))
- return -1;
- /* We have freed @to_free real clusters. */
- nr_freed = to_free;
- } else {
- /* No real clusters were freed. */
- nr_freed = 0;
- }
-
- /* Go to the next run and adjust the number of clusters left to free. */
- ++rl;
- if (count >= 0)
- count -= to_free;
-
- /*
- * Loop over the remaining runs, using @count as a capping value, and
- * free them.
- */
- for (; rl->length && count != 0; ++rl) {
- // FIXME: Need to try ntfs_attr_map_runlist() for attribute
- // list support! (AIA)
- if (rl->lcn < 0 && rl->lcn != LCN_HOLE) {
- // FIXME: Eeek! We need rollback! (AIA)
- ntfs_log_trace("Eeek! invalid lcn (= %lli). Should attempt "
- "to map runlist! Leaving inconsistent "
- "metadata!\n", (long long)rl->lcn);
- errno = EIO;
- return -1;
- }
-
- /* The number of clusters in this run that need freeing. */
- to_free = rl->length;
- if (count >= 0 && to_free > count)
- to_free = count;
-
- if (rl->lcn != LCN_HOLE) {
- /* Do the actual freeing of the clusters in the run. */
- if (ntfs_bitmap_clear_run(vol->lcnbmp_na, rl->lcn,
- to_free)) {
- int eo = errno;
-
- // FIXME: Eeek! We need rollback! (AIA)
- ntfs_log_trace("Eeek! bitmap clear run failed. "
- "Leaving inconsistent metadata!\n");
- errno = eo;
- return -1;
- }
- /* We have freed @to_free real clusters. */
- nr_freed += to_free;
- }
-
- if (count >= 0)
- count -= to_free;
- }
-
- if (count != -1 && count != 0) {
- // FIXME: Eeek! BUG()
- ntfs_log_trace("Eeek! count still not zero (= %lli). Leaving "
- "inconsistent metadata!\n", (long long)count);
- errno = EIO;
- return -1;
- }
-
- /* Done. Return the number of actual clusters that were freed. */
- return nr_freed;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2025-08-07 11:21:31 +0000