diff options
Diffstat (limited to 'fs/ntfs/lcnalloc.c')
| -rw-r--r-- | fs/ntfs/lcnalloc.c | 1000 |
1 files changed, 0 insertions, 1000 deletions
diff --git a/fs/ntfs/lcnalloc.c b/fs/ntfs/lcnalloc.c deleted file mode 100644 index eda9972e6159..000000000000 --- a/fs/ntfs/lcnalloc.c +++ /dev/null @@ -1,1000 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * lcnalloc.c - Cluster (de)allocation code. Part of the Linux-NTFS project. - * - * Copyright (c) 2004-2005 Anton Altaparmakov - */ - -#ifdef NTFS_RW - -#include <linux/pagemap.h> - -#include "lcnalloc.h" -#include "debug.h" -#include "bitmap.h" -#include "inode.h" -#include "volume.h" -#include "attrib.h" -#include "malloc.h" -#include "aops.h" -#include "ntfs.h" - -/** - * ntfs_cluster_free_from_rl_nolock - free clusters from runlist - * @vol: mounted ntfs volume on which to free the clusters - * @rl: runlist describing the clusters to free - * - * Free all the clusters described by the runlist @rl on the volume @vol. In - * the case of an error being returned, at least some of the clusters were not - * freed. - * - * Return 0 on success and -errno on error. - * - * Locking: - The volume lcn bitmap must be locked for writing on entry and is - * left locked on return. - */ -int ntfs_cluster_free_from_rl_nolock(ntfs_volume *vol, - const runlist_element *rl) -{ - struct inode *lcnbmp_vi = vol->lcnbmp_ino; - int ret = 0; - - ntfs_debug("Entering."); - if (!rl) - return 0; - for (; rl->length; rl++) { - int err; - - if (rl->lcn < 0) - continue; - err = ntfs_bitmap_clear_run(lcnbmp_vi, rl->lcn, rl->length); - if (unlikely(err && (!ret || ret == -ENOMEM) && ret != err)) - ret = err; - } - ntfs_debug("Done."); - return ret; -} - -/** - * 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 - * @is_extension: if 'true', this is an attribute extension - * - * 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 or - * MFT_ZONE for allocation of clusters for the master file table, i.e. the - * $MFT/$DATA attribute. - * - * @start_vcn specifies the vcn of the first allocated cluster. This makes - * merging the resulting runlist with the old runlist easier. - * - * If @is_extension is 'true', the caller is allocating clusters to extend an - * attribute and if it is 'false', the caller is allocating clusters to fill a - * hole in an attribute. Practically the difference is that if @is_extension - * is 'true' the returned runlist will be terminated with LCN_ENOENT and if - * @is_extension is 'false' the runlist will be terminated with - * LCN_RL_NOT_MAPPED. - * - * You need to check the return value with IS_ERR(). If this is false, the - * function was successful and the return value is a runlist describing the - * allocated cluster(s). If IS_ERR() is true, the function failed and - * PTR_ERR() gives you 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 does not 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 NT, 2) cause reduction in - * fragmentation, 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) - * - * Locking: - The volume lcn bitmap must be unlocked on entry and is unlocked - * on return. - * - This function takes the volume lcn bitmap lock for writing and - * modifies the bitmap contents. - */ -runlist_element *ntfs_cluster_alloc(ntfs_volume *vol, const VCN start_vcn, - const s64 count, const LCN start_lcn, - const NTFS_CLUSTER_ALLOCATION_ZONES zone, - const bool is_extension) -{ - 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; - loff_t i_size; - struct inode *lcnbmp_vi; - runlist_element *rl = NULL; - struct address_space *mapping; - struct page *page = NULL; - u8 *buf, *byte; - int err = 0, rlpos, rlsize, buf_size; - u8 pass, done_zones, search_zone, need_writeback = 0, bit; - - ntfs_debug("Entering for start_vcn 0x%llx, count 0x%llx, start_lcn " - "0x%llx, zone %s_ZONE.", (unsigned long long)start_vcn, - (unsigned long long)count, - (unsigned long long)start_lcn, - zone == MFT_ZONE ? "MFT" : "DATA"); - BUG_ON(!vol); - lcnbmp_vi = vol->lcnbmp_ino; - BUG_ON(!lcnbmp_vi); - BUG_ON(start_vcn < 0); - BUG_ON(count < 0); - BUG_ON(start_lcn < -1); - BUG_ON(zone < FIRST_ZONE); - BUG_ON(zone > LAST_ZONE); - - /* Return NULL if @count is zero. */ - if (!count) - return NULL; - /* Take the lcnbmp lock for writing. */ - down_write(&vol->lcnbmp_lock); - /* - * 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; - mapping = lcnbmp_vi->i_mapping; - i_size = i_size_read(lcnbmp_vi); - while (1) { - ntfs_debug("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.", - done_zones, search_zone, pass, - (unsigned long long)zone_start, - (unsigned long long)zone_end, - (unsigned long long)bmp_initial_pos, - (unsigned long long)bmp_pos, rlpos, rlsize); - /* Loop until we run out of free clusters. */ - last_read_pos = bmp_pos >> 3; - ntfs_debug("last_read_pos 0x%llx.", - (unsigned long long)last_read_pos); - if (last_read_pos > i_size) { - ntfs_debug("End of attribute reached. " - "Skipping to zone_pass_done."); - goto zone_pass_done; - } - if (likely(page)) { - if (need_writeback) { - ntfs_debug("Marking page dirty."); - flush_dcache_page(page); - set_page_dirty(page); - need_writeback = 0; - } - ntfs_unmap_page(page); - } - page = ntfs_map_page(mapping, last_read_pos >> - PAGE_SHIFT); - if (IS_ERR(page)) { - err = PTR_ERR(page); - ntfs_error(vol->sb, "Failed to map page."); - goto out; - } - buf_size = last_read_pos & ~PAGE_MASK; - buf = page_address(page) + buf_size; - buf_size = PAGE_SIZE - buf_size; - if (unlikely(last_read_pos + buf_size > i_size)) - buf_size = i_size - last_read_pos; - buf_size <<= 3; - lcn = bmp_pos & 7; - bmp_pos &= ~(LCN)7; - ntfs_debug("Before inner while loop: buf_size %i, lcn 0x%llx, " - "bmp_pos 0x%llx, need_writeback %i.", buf_size, - (unsigned long long)lcn, - (unsigned long long)bmp_pos, need_writeback); - while (lcn < buf_size && lcn + bmp_pos < zone_end) { - byte = buf + (lcn >> 3); - ntfs_debug("In inner while loop: buf_size %i, " - "lcn 0x%llx, bmp_pos 0x%llx, " - "need_writeback %i, byte ofs 0x%x, " - "*byte 0x%x.", buf_size, - (unsigned long long)lcn, - (unsigned long long)bmp_pos, - need_writeback, - (unsigned int)(lcn >> 3), - (unsigned int)*byte); - /* Skip full bytes. */ - if (*byte == 0xff) { - lcn = (lcn + 8) & ~(LCN)7; - ntfs_debug("Continuing while loop 1."); - continue; - } - bit = 1 << (lcn & 7); - ntfs_debug("bit 0x%x.", bit); - /* If the bit is already set, go onto the next one. */ - if (*byte & bit) { - lcn++; - ntfs_debug("Continuing while loop 2."); - continue; - } - /* - * Allocate more memory if needed, including space for - * the terminator element. - * ntfs_malloc_nofs() operates on whole pages only. - */ - if ((rlpos + 2) * sizeof(*rl) > rlsize) { - runlist_element *rl2; - - ntfs_debug("Reallocating memory."); - if (!rl) - ntfs_debug("First free bit is at LCN " - "0x%llx.", - (unsigned long long) - (lcn + bmp_pos)); - rl2 = ntfs_malloc_nofs(rlsize + (int)PAGE_SIZE); - if (unlikely(!rl2)) { - err = -ENOMEM; - ntfs_error(vol->sb, "Failed to " - "allocate memory."); - goto out; - } - memcpy(rl2, rl, rlsize); - ntfs_free(rl); - rl = rl2; - rlsize += PAGE_SIZE; - ntfs_debug("Reallocated memory, rlsize 0x%x.", - rlsize); - } - /* Allocate the bitmap bit. */ - *byte |= bit; - /* We need to write this bitmap page to disk. */ - need_writeback = 1; - ntfs_debug("*byte 0x%x, need_writeback is set.", - (unsigned int)*byte); - /* - * Coalesce with previous run if adjacent LCNs. - * Otherwise, append a new run. - */ - ntfs_debug("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.", - (unsigned long long)(lcn + bmp_pos), - 1ULL, (unsigned long long)prev_lcn, - (unsigned long long)lcn, - (unsigned long long)bmp_pos, - (unsigned long long)prev_run_len, - rlpos); - if (prev_lcn == lcn + bmp_pos - prev_run_len && rlpos) { - ntfs_debug("Coalescing to run (lcn 0x%llx, " - "len 0x%llx).", - (unsigned long long) - rl[rlpos - 1].lcn, - (unsigned long long) - rl[rlpos - 1].length); - rl[rlpos - 1].length = ++prev_run_len; - ntfs_debug("Run now (lcn 0x%llx, len 0x%llx), " - "prev_run_len 0x%llx.", - (unsigned long long) - rl[rlpos - 1].lcn, - (unsigned long long) - rl[rlpos - 1].length, - (unsigned long long) - prev_run_len); - } else { - if (likely(rlpos)) { - ntfs_debug("Adding new run, (previous " - "run lcn 0x%llx, " - "len 0x%llx).", - (unsigned long long) - rl[rlpos - 1].lcn, - (unsigned long long) - rl[rlpos - 1].length); - rl[rlpos].vcn = rl[rlpos - 1].vcn + - prev_run_len; - } else { - ntfs_debug("Adding new run, is first " - "run."); - 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_debug("Done. Updating current zone " - "position, tc 0x%llx, " - "search_zone %i.", - (unsigned long long)tc, - search_zone); - switch (search_zone) { - case 1: - ntfs_debug("Before checks, " - "vol->mft_zone_pos " - "0x%llx.", - (unsigned 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_debug("After checks, " - "vol->mft_zone_pos " - "0x%llx.", - (unsigned long long) - vol->mft_zone_pos); - break; - case 2: - ntfs_debug("Before checks, " - "vol->data1_zone_pos " - "0x%llx.", - (unsigned 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_debug("After checks, " - "vol->data1_zone_pos " - "0x%llx.", - (unsigned long long) - vol->data1_zone_pos); - break; - case 4: - ntfs_debug("Before checks, " - "vol->data2_zone_pos " - "0x%llx.", - (unsigned 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_debug("After checks, " - "vol->data2_zone_pos " - "0x%llx.", - (unsigned long long) - vol->data2_zone_pos); - break; - default: - BUG(); - } - ntfs_debug("Finished. Going to out."); - goto out; - } - lcn++; - } - bmp_pos += buf_size; - ntfs_debug("After inner while loop: buf_size 0x%x, lcn " - "0x%llx, bmp_pos 0x%llx, need_writeback %i.", - buf_size, (unsigned long long)lcn, - (unsigned long long)bmp_pos, need_writeback); - if (bmp_pos < zone_end) { - ntfs_debug("Continuing outer while loop, " - "bmp_pos 0x%llx, zone_end 0x%llx.", - (unsigned long long)bmp_pos, - (unsigned long long)zone_end); - continue; - } -zone_pass_done: /* Finished with the current zone pass. */ - ntfs_debug("At zone_pass_done, pass %i.", 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: - BUG(); - } - /* Sanity check. */ - if (zone_end < zone_start) - zone_end = zone_start; - bmp_pos = zone_start; - ntfs_debug("Continuing outer while loop, pass 2, " - "zone_start 0x%llx, zone_end 0x%llx, " - "bmp_pos 0x%llx.", - (unsigned long long)zone_start, - (unsigned long long)zone_end, - (unsigned long long)bmp_pos); - continue; - } /* pass == 2 */ -done_zones_check: - ntfs_debug("At done_zones_check, search_zone %i, done_zones " - "before 0x%x, done_zones after 0x%x.", - search_zone, done_zones, - done_zones | search_zone); - done_zones |= search_zone; - if (done_zones < 7) { - ntfs_debug("Switching zone."); - /* Now switch to the next zone we haven't done yet. */ - pass = 1; - switch (search_zone) { - case 1: - ntfs_debug("Switching from mft zone to data1 " - "zone."); - /* Update mft zone position. */ - if (rlpos) { - LCN tc; - - ntfs_debug("Before checks, " - "vol->mft_zone_pos " - "0x%llx.", - (unsigned 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_debug("After checks, " - "vol->mft_zone_pos " - "0x%llx.", - (unsigned 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_debug("Switching from data1 zone to " - "data2 zone."); - /* Update data1 zone position. */ - if (rlpos) { - LCN tc; - - ntfs_debug("Before checks, " - "vol->data1_zone_pos " - "0x%llx.", - (unsigned 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_debug("After checks, " - "vol->data1_zone_pos " - "0x%llx.", - (unsigned 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_debug("Switching from data2 zone to " - "data1 zone."); - /* Update data2 zone position. */ - if (rlpos) { - LCN tc; - - ntfs_debug("Before checks, " - "vol->data2_zone_pos " - "0x%llx.", - (unsigned 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_debug("After checks, " - "vol->data2_zone_pos " - "0x%llx.", - (unsigned long long) - vol->data2_zone_pos); - } - /* Switch from data2 zone to data1 zone. */ - goto switch_to_data1_zone; - default: - BUG(); - } - ntfs_debug("After zone switch, search_zone %i, " - "pass %i, bmp_initial_pos 0x%llx, " - "zone_start 0x%llx, zone_end 0x%llx.", - search_zone, pass, - (unsigned long long)bmp_initial_pos, - (unsigned long long)zone_start, - (unsigned long long)zone_end); - bmp_pos = zone_start; - if (zone_start == zone_end) { - ntfs_debug("Empty zone, going to " - "done_zones_check."); - /* Empty zone. Don't bother searching it. */ - goto done_zones_check; - } - ntfs_debug("Continuing outer while loop."); - continue; - } /* done_zones == 7 */ - ntfs_debug("All zones are finished."); - /* - * 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_debug("vol->mft_zone_start 0x%llx, vol->mft_zone_end " - "0x%llx, mft_zone_size 0x%llx.", - (unsigned long long)vol->mft_zone_start, - (unsigned long long)vol->mft_zone_end, - (unsigned long long)mft_zone_size); - if (zone == MFT_ZONE || mft_zone_size <= 0) { - ntfs_debug("No free clusters left, going to out."); - /* Really no more space left on device. */ - err = -ENOSPC; - goto out; - } /* zone == DATA_ZONE && mft_zone_size > 0 */ - ntfs_debug("Shrinking mft zone."); - 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_debug("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.", - (unsigned long long)mft_zone_size, - (unsigned long long)vol->mft_zone_start, - (unsigned long long)vol->mft_zone_end, - (unsigned long long)vol->mft_zone_pos, - done_zones, (unsigned long long)zone_start, - (unsigned long long)zone_end, - (unsigned long long)vol->data1_zone_pos); - } - ntfs_debug("After outer while loop."); -out: - ntfs_debug("At out."); - /* Add runlist terminator element. */ - if (likely(rl)) { - rl[rlpos].vcn = rl[rlpos - 1].vcn + rl[rlpos - 1].length; - rl[rlpos].lcn = is_extension ? LCN_ENOENT : LCN_RL_NOT_MAPPED; - rl[rlpos].length = 0; - } - if (likely(page && !IS_ERR(page))) { - if (need_writeback) { - ntfs_debug("Marking page dirty."); - flush_dcache_page(page); - set_page_dirty(page); - need_writeback = 0; - } - ntfs_unmap_page(page); - } - if (likely(!err)) { - up_write(&vol->lcnbmp_lock); - ntfs_debug("Done."); - return rl; - } - ntfs_error(vol->sb, "Failed to allocate clusters, aborting " - "(error %i).", err); - if (rl) { - int err2; - - if (err == -ENOSPC) - ntfs_debug("Not enough space to complete allocation, " - "err -ENOSPC, first free lcn 0x%llx, " - "could allocate up to 0x%llx " - "clusters.", - (unsigned long long)rl[0].lcn, - (unsigned long long)(count - clusters)); - /* Deallocate all allocated clusters. */ - ntfs_debug("Attempting rollback..."); - err2 = ntfs_cluster_free_from_rl_nolock(vol, rl); - if (err2) { - ntfs_error(vol->sb, "Failed to rollback (error %i). " - "Leaving inconsistent metadata! " - "Unmount and run chkdsk.", err2); - NVolSetErrors(vol); - } - /* Free the runlist. */ - ntfs_free(rl); - } else if (err == -ENOSPC) - ntfs_debug("No space left at all, err = -ENOSPC, first free " - "lcn = 0x%llx.", - (long long)vol->data1_zone_pos); - up_write(&vol->lcnbmp_lock); - return ERR_PTR(err); -} - -/** - * __ntfs_cluster_free - free clusters on an ntfs volume - * @ni: ntfs inode whose runlist describes the clusters to free - * @start_vcn: vcn in the runlist of @ni at which to start freeing clusters - * @count: number of clusters to free or -1 for all clusters - * @ctx: active attribute search context if present or NULL if not - * @is_rollback: true if this is a rollback operation - * - * Free @count clusters starting at the cluster @start_vcn in the runlist - * described by the vfs inode @ni. - * - * If @count is -1, all clusters from @start_vcn to the end of the runlist are - * deallocated. Thus, to completely free all clusters in a runlist, use - * @start_vcn = 0 and @count = -1. - * - * If @ctx is specified, it is an active search context of @ni and its base mft - * record. This is needed when __ntfs_cluster_free() encounters unmapped - * runlist fragments and allows their mapping. If you do not have the mft - * record mapped, you can specify @ctx as NULL and __ntfs_cluster_free() will - * perform the necessary mapping and unmapping. - * - * Note, __ntfs_cluster_free() saves the state of @ctx on entry and restores it - * before returning. Thus, @ctx will be left pointing to the same attribute on - * return as on entry. However, the actual pointers in @ctx may point to - * different memory locations on return, so you must remember to reset any - * cached pointers from the @ctx, i.e. after the call to __ntfs_cluster_free(), - * you will probably want to do: - * m = ctx->mrec; - * a = ctx->attr; - * Assuming you cache ctx->attr in a variable @a of type ATTR_RECORD * and that - * you cache ctx->mrec in a variable @m of type MFT_RECORD *. - * - * @is_rollback should always be 'false', it is for internal use to rollback - * errors. You probably want to use ntfs_cluster_free() instead. - * - * Note, __ntfs_cluster_free() does not modify the runlist, so you have to - * remove from the runlist or mark sparse the freed runs later. - * - * Return the number of deallocated clusters (not counting sparse ones) on - * success and -errno on error. - * - * WARNING: If @ctx is supplied, regardless of whether success or failure is - * returned, you need to check IS_ERR(@ctx->mrec) and if 'true' the @ctx - * is no longer valid, i.e. you need to either call - * ntfs_attr_reinit_search_ctx() or ntfs_attr_put_search_ctx() on it. - * In that case PTR_ERR(@ctx->mrec) will give you the error code for - * why the mapping of the old inode failed. - * - * Locking: - The runlist described by @ni must be locked for writing on entry - * and is locked on return. Note the runlist may be modified when - * needed runlist fragments need to be mapped. - * - The volume lcn bitmap must be unlocked on entry and is unlocked - * on return. - * - This function takes the volume lcn bitmap lock for writing and - * modifies the bitmap contents. - * - If @ctx is NULL, the base mft record of @ni must not be mapped on - * entry and it will be left unmapped on return. - * - If @ctx is not NULL, the base mft record must be mapped on entry - * and it will be left mapped on return. - */ -s64 __ntfs_cluster_free(ntfs_inode *ni, const VCN start_vcn, s64 count, - ntfs_attr_search_ctx *ctx, const bool is_rollback) -{ - s64 delta, to_free, total_freed, real_freed; - ntfs_volume *vol; - struct inode *lcnbmp_vi; - runlist_element *rl; - int err; - - BUG_ON(!ni); - ntfs_debug("Entering for i_ino 0x%lx, start_vcn 0x%llx, count " - "0x%llx.%s", ni->mft_no, (unsigned long long)start_vcn, - (unsigned long long)count, - is_rollback ? " (rollback)" : ""); - vol = ni->vol; - lcnbmp_vi = vol->lcnbmp_ino; - BUG_ON(!lcnbmp_vi); - BUG_ON(start_vcn < 0); - BUG_ON(count < -1); - /* - * Lock the lcn bitmap for writing but only if not rolling back. We - * must hold the lock all the way including through rollback otherwise - * rollback is not possible because once we have cleared a bit and - * dropped the lock, anyone could have set the bit again, thus - * allocating the cluster for another use. - */ - if (likely(!is_rollback)) - down_write(&vol->lcnbmp_lock); - - total_freed = real_freed = 0; - - rl = ntfs_attr_find_vcn_nolock(ni, start_vcn, ctx); - if (IS_ERR(rl)) { - if (!is_rollback) - ntfs_error(vol->sb, "Failed to find first runlist " - "element (error %li), aborting.", - PTR_ERR(rl)); - err = PTR_ERR(rl); - goto err_out; - } - if (unlikely(rl->lcn < LCN_HOLE)) { - if (!is_rollback) - ntfs_error(vol->sb, "First runlist element has " - "invalid lcn, aborting."); - err = -EIO; - goto err_out; - } - /* 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 (likely(rl->lcn >= 0)) { - /* Do the actual freeing of the clusters in this run. */ - err = ntfs_bitmap_set_bits_in_run(lcnbmp_vi, rl->lcn + delta, - to_free, likely(!is_rollback) ? 0 : 1); - if (unlikely(err)) { - if (!is_rollback) - ntfs_error(vol->sb, "Failed to clear first run " - "(error %i), aborting.", err); - goto err_out; - } - /* We have freed @to_free real clusters. */ - real_freed = to_free; - }; - /* Go to the next run and adjust the number of clusters left to free. */ - ++rl; - if (count >= 0) - count -= to_free; - - /* Keep track of the total "freed" clusters, including sparse ones. */ - total_freed = to_free; - /* - * Loop over the remaining runs, using @count as a capping value, and - * free them. - */ - for (; rl->length && count != 0; ++rl) { - if (unlikely(rl->lcn < LCN_HOLE)) { - VCN vcn; - - /* Attempt to map runlist. */ - vcn = rl->vcn; - rl = ntfs_attr_find_vcn_nolock(ni, vcn, ctx); - if (IS_ERR(rl)) { - err = PTR_ERR(rl); - if (!is_rollback) - ntfs_error(vol->sb, "Failed to map " - "runlist fragment or " - "failed to find " - "subsequent runlist " - "element."); - goto err_out; - } - if (unlikely(rl->lcn < LCN_HOLE)) { - if (!is_rollback) - ntfs_error(vol->sb, "Runlist element " - "has invalid lcn " - "(0x%llx).", - (unsigned long long) - rl->lcn); - err = -EIO; - goto err_out; - } - } - /* The number of clusters in this run that need freeing. */ - to_free = rl->length; - if (count >= 0 && to_free > count) - to_free = count; - - if (likely(rl->lcn >= 0)) { - /* Do the actual freeing of the clusters in the run. */ - err = ntfs_bitmap_set_bits_in_run(lcnbmp_vi, rl->lcn, - to_free, likely(!is_rollback) ? 0 : 1); - if (unlikely(err)) { - if (!is_rollback) - ntfs_error(vol->sb, "Failed to clear " - "subsequent run."); - goto err_out; - } - /* We have freed @to_free real clusters. */ - real_freed += to_free; - } - /* Adjust the number of clusters left to free. */ - if (count >= 0) - count -= to_free; - - /* Update the total done clusters. */ - total_freed += to_free; - } - if (likely(!is_rollback)) - up_write(&vol->lcnbmp_lock); - - BUG_ON(count > 0); - - /* We are done. Return the number of actually freed clusters. */ - ntfs_debug("Done."); - return real_freed; -err_out: - if (is_rollback) - return err; - /* If no real clusters were freed, no need to rollback. */ - if (!real_freed) { - up_write(&vol->lcnbmp_lock); - return err; - } - /* - * Attempt to rollback and if that succeeds just return the error code. - * If rollback fails, set the volume errors flag, emit an error - * message, and return the error code. - */ - delta = __ntfs_cluster_free(ni, start_vcn, total_freed, ctx, true); - if (delta < 0) { - ntfs_error(vol->sb, "Failed to rollback (error %i). Leaving " - "inconsistent metadata! Unmount and run " - "chkdsk.", (int)delta); - NVolSetErrors(vol); - } - up_write(&vol->lcnbmp_lock); - ntfs_error(vol->sb, "Aborting (error %i).", err); - return err; -} - -#endif /* NTFS_RW */ |