From b16d21bd28db27ad9f29a31bf47b76505585de58 Mon Sep 17 00:00:00 2001 From: Anton Altaparmakov Date: Sat, 16 Oct 2004 02:01:40 +0100 Subject: [PATCH] NTFS: Add fs/ntfs/mft.[hc]::ntfs_mft_record_alloc() and various helper functions used by it. Signed-off-by: Anton Altaparmakov --- fs/ntfs/ChangeLog | 2 + fs/ntfs/mft.c | 1573 +++++++++++++++++++++++++++++++++++++++++++++ fs/ntfs/mft.h | 2 + 3 files changed, 1577 insertions(+) diff --git a/fs/ntfs/ChangeLog b/fs/ntfs/ChangeLog index 13da1337fd851..218b4c8bb947d 100644 --- a/fs/ntfs/ChangeLog +++ b/fs/ntfs/ChangeLog @@ -136,6 +136,8 @@ ToDo/Notes: - Add helpers fs/ntfs/layout.h::MK_MREF() and MK_LE_MREF(). - Modify fs/ntfs/mft.c::map_extent_mft_record() to only verify the mft record sequence number if it is specified (i.e. not zero). + - Add fs/ntfs/mft.[hc]::ntfs_mft_record_alloc() and various helper + functions used by it. 2.1.20 - Fix two stupid bugs introduced in 2.1.18 release. diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c index e3ff64fd8522c..982cf8e37ba64 100644 --- a/fs/ntfs/mft.c +++ b/fs/ntfs/mft.c @@ -995,6 +995,1579 @@ BOOL ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no, static const char *es = " Leaving inconsistent metadata. Unmount and run " "chkdsk."; +/** + * ntfs_mft_bitmap_find_and_alloc_free_rec_nolock - see name + * @vol: volume on which to search for a free mft record + * @base_ni: open base inode if allocating an extent mft record or NULL + * + * Search for a free mft record in the mft bitmap attribute on the ntfs volume + * @vol. + * + * If @base_ni is NULL start the search at the default allocator position. + * + * If @base_ni is not NULL start the search at the mft record after the base + * mft record @base_ni. + * + * Return the free mft record on success and -errno on error. An error code of + * -ENOSPC means that there are no free mft records in the currently + * initialized mft bitmap. + * + * Locking: Caller must hold vol->mftbmp_lock for writing. + */ +static int ntfs_mft_bitmap_find_and_alloc_free_rec_nolock(ntfs_volume *vol, + ntfs_inode *base_ni) +{ + s64 pass_end, ll, data_pos, pass_start, ofs, bit; + struct address_space *mftbmp_mapping; + u8 *buf, *byte; + struct page *page; + unsigned int page_ofs, size; + u8 pass, b; + + ntfs_debug("Searching for free mft record in the currently " + "initialized mft bitmap."); + mftbmp_mapping = vol->mftbmp_ino->i_mapping; + /* + * Set the end of the pass making sure we do not overflow the mft + * bitmap. + */ + pass_end = NTFS_I(vol->mft_ino)->allocated_size >> + vol->mft_record_size_bits; + ll = NTFS_I(vol->mftbmp_ino)->initialized_size << 3; + if (pass_end > ll) + pass_end = ll; + pass = 1; + if (!base_ni) + data_pos = vol->mft_data_pos; + else + data_pos = base_ni->mft_no + 1; + if (data_pos < 24) + data_pos = 24; + if (data_pos >= pass_end) { + data_pos = 24; + pass = 2; + /* This happens on a freshly formatted volume. */ + if (data_pos >= pass_end) + return -ENOSPC; + } + pass_start = data_pos; + ntfs_debug("Starting bitmap search: pass %u, pass_start 0x%llx, " + "pass_end 0x%llx, data_pos 0x%llx.", pass, + (long long)pass_start, (long long)pass_end, + (long long)data_pos); + /* Loop until a free mft record is found. */ + for (; pass <= 2;) { + /* Cap size to pass_end. */ + ofs = data_pos >> 3; + page_ofs = ofs & ~PAGE_CACHE_MASK; + size = PAGE_CACHE_SIZE - page_ofs; + ll = ((pass_end + 7) >> 3) - ofs; + if (size > ll) + size = ll; + size <<= 3; + /* + * If we are still within the active pass, search the next page + * for a zero bit. + */ + if (size) { + page = ntfs_map_page(mftbmp_mapping, + ofs >> PAGE_CACHE_SHIFT); + if (unlikely(IS_ERR(page))) { + ntfs_error(vol->sb, "Failed to read mft " + "bitmap, aborting."); + return PTR_ERR(page); + } + buf = (u8*)page_address(page) + page_ofs; + bit = data_pos & 7; + data_pos &= ~7ull; + ntfs_debug("Before inner for loop: size 0x%x, " + "data_pos 0x%llx, bit 0x%llx", size, + (long long)data_pos, (long long)bit); + for (; bit < size && data_pos + bit < pass_end; + bit &= ~7ull, bit += 8) { + byte = buf + (bit >> 3); + if (*byte == 0xff) + continue; + b = ffz((unsigned long)*byte); + if (b < 8 && b >= (bit & 7)) { + ll = data_pos + (bit & ~7ull) + b; + if (unlikely(ll > (1ll << 32))) { + ntfs_unmap_page(page); + return -ENOSPC; + } + *byte |= 1 << b; + flush_dcache_page(page); + set_page_dirty(page); + ntfs_unmap_page(page); + ntfs_debug("Done. (Found and " + "allocated mft record " + "0x%llx.)", + (long long)ll); + return ll; + } + } + ntfs_debug("After inner for loop: size 0x%x, " + "data_pos 0x%llx, bit 0x%llx", size, + (long long)data_pos, (long long)bit); + data_pos += size; + ntfs_unmap_page(page); + /* + * If the end of the pass has not been reached yet, + * continue searching the mft bitmap for a zero bit. + */ + if (data_pos < pass_end) + continue; + } + /* Do the next pass. */ + if (++pass == 2) { + /* + * Starting the second pass, in which we scan the first + * part of the zone which we omitted earlier. + */ + pass_end = pass_start; + data_pos = pass_start = 24; + ntfs_debug("pass %i, pass_start 0x%llx, pass_end " + "0x%llx.", pass, (long long)pass_start, + (long long)pass_end); + if (data_pos >= pass_end) + break; + } + } + /* No free mft records in currently initialized mft bitmap. */ + ntfs_debug("Done. (No free mft records left in currently initialized " + "mft bitmap.)"); + return -ENOSPC; +} + +/** + * ntfs_mft_bitmap_extend_allocation_nolock - extend mft bitmap by a cluster + * @vol: volume on which to extend the mft bitmap attribute + * + * Extend the mft bitmap attribute on the ntfs volume @vol by one cluster. + * + * Note: Only changes allocated_size, i.e. does not touch initialized_size or + * data_size. + * + * Return 0 on success and -errno on error. + * + * Locking: - Caller must hold vol->mftbmp_lock for writing. + * - This function takes NTFS_I(vol->mftbmp_ino)->runlist.lock for + * writing and releases it before returning. + * - This function takes vol->lcnbmp_lock for writing and releases it + * before returning. + */ +static int ntfs_mft_bitmap_extend_allocation_nolock(ntfs_volume *vol) +{ + LCN lcn; + s64 ll; + struct page *page; + ntfs_inode *mft_ni, *mftbmp_ni; + runlist_element *rl, *rl2 = NULL; + ntfs_attr_search_ctx *ctx = NULL; + MFT_RECORD *mrec; + ATTR_RECORD *a = NULL; + int ret, mp_size; + u32 old_alen = 0; + u8 *b, tb; + struct { + u8 added_cluster:1; + u8 added_run:1; + u8 mp_rebuilt:1; + } status = { 0, 0, 0 }; + + ntfs_debug("Extending mft bitmap allocation."); + mft_ni = NTFS_I(vol->mft_ino); + mftbmp_ni = NTFS_I(vol->mftbmp_ino); + /* + * Determine the last lcn of the mft bitmap. The allocated size of the + * mft bitmap cannot be zero so we are ok to do this. + * ntfs_find_vcn() returns the runlist locked on success. + */ + rl = ntfs_find_vcn(mftbmp_ni, (mftbmp_ni->allocated_size - 1) >> + vol->cluster_size_bits, TRUE); + if (unlikely(IS_ERR(rl) || !rl->length || rl->lcn < 0)) { + ntfs_error(vol->sb, "Failed to determine last allocated " + "cluster of mft bitmap attribute."); + if (!IS_ERR(rl)) { + up_write(&mftbmp_ni->runlist.lock); + ret = -EIO; + } else + ret = PTR_ERR(rl); + return ret; + } + lcn = rl->lcn + rl->length; + ntfs_debug("Last lcn of mft bitmap attribute is 0x%llx.", + (long long)lcn); + /* + * Attempt to get the cluster following the last allocated cluster by + * hand as it may be in the MFT zone so the allocator would not give it + * to us. + */ + ll = lcn >> 3; + page = ntfs_map_page(vol->lcnbmp_ino->i_mapping, + ll >> PAGE_CACHE_SHIFT); + if (IS_ERR(page)) { + up_write(&mftbmp_ni->runlist.lock); + ntfs_error(vol->sb, "Failed to read from lcn bitmap."); + return PTR_ERR(page); + } + b = (u8*)page_address(page) + (ll & ~PAGE_CACHE_MASK); + tb = 1 << (lcn & 7ull); + down_write(&vol->lcnbmp_lock); + if (*b != 0xff && !(*b & tb)) { + /* Next cluster is free, allocate it. */ + *b |= tb; + flush_dcache_page(page); + set_page_dirty(page); + up_write(&vol->lcnbmp_lock); + ntfs_unmap_page(page); + /* Update the mft bitmap runlist. */ + rl->length++; + rl[1].vcn++; + status.added_cluster = 1; + ntfs_debug("Appending one cluster to mft bitmap."); + } else { + up_write(&vol->lcnbmp_lock); + ntfs_unmap_page(page); + /* Allocate a cluster from the DATA_ZONE. */ + rl2 = ntfs_cluster_alloc(vol, rl[1].vcn, 1, lcn, DATA_ZONE); + if (IS_ERR(rl2)) { + up_write(&mftbmp_ni->runlist.lock); + ntfs_error(vol->sb, "Failed to allocate a cluster for " + "the mft bitmap."); + return PTR_ERR(rl2); + } + rl = ntfs_runlists_merge(mftbmp_ni->runlist.rl, rl2); + if (IS_ERR(rl)) { + up_write(&mftbmp_ni->runlist.lock); + ntfs_error(vol->sb, "Failed to merge runlists for mft " + "bitmap."); + if (ntfs_cluster_free_from_rl(vol, rl2)) { + ntfs_error(vol->sb, "Failed to dealocate " + "allocated cluster.%s", es); + NVolSetErrors(vol); + } + ntfs_free(rl2); + return PTR_ERR(rl); + } + mftbmp_ni->runlist.rl = rl; + status.added_run = 1; + ntfs_debug("Adding one run to mft bitmap."); + /* Find the last run in the new runlist. */ + for (; rl[1].length; rl++) + ; + } + /* + * Update the attribute record as well. Note: @rl is the last + * (non-terminator) runlist element of mft bitmap. + */ + mrec = map_mft_record(mft_ni); + if (IS_ERR(mrec)) { + ntfs_error(vol->sb, "Failed to map mft record."); + ret = PTR_ERR(mrec); + goto undo_alloc; + } + ctx = ntfs_attr_get_search_ctx(mft_ni, mrec); + if (unlikely(!ctx)) { + ntfs_error(vol->sb, "Failed to get search context."); + ret = -ENOMEM; + goto undo_alloc; + } + ret = ntfs_attr_lookup(mftbmp_ni->type, mftbmp_ni->name, + mftbmp_ni->name_len, CASE_SENSITIVE, rl[1].vcn, NULL, + 0, ctx); + if (unlikely(ret)) { + ntfs_error(vol->sb, "Failed to find last attribute extent of " + "mft bitmap attribute."); + if (ret == -ENOENT) + ret = -EIO; + goto undo_alloc; + } + a = ctx->attr; + ll = sle64_to_cpu(a->data.non_resident.lowest_vcn); + /* Search back for the previous last allocated cluster of mft bitmap. */ + for (rl2 = rl; rl2 > mftbmp_ni->runlist.rl; rl2--) { + if (ll >= rl2->vcn) + break; + } + BUG_ON(ll < rl2->vcn); + BUG_ON(ll >= rl2->vcn + rl2->length); + /* Get the size for the new mapping pairs array for this extent. */ + mp_size = ntfs_get_size_for_mapping_pairs(vol, rl2, ll); + if (unlikely(mp_size <= 0)) { + ntfs_error(vol->sb, "Get size for mapping pairs failed for " + "mft bitmap attribute extent."); + ret = mp_size; + if (!ret) + ret = -EIO; + goto undo_alloc; + } + /* Expand the attribute record if necessary. */ + old_alen = le32_to_cpu(a->length); + ret = ntfs_attr_record_resize(ctx->mrec, a, mp_size + + le16_to_cpu(a->data.non_resident.mapping_pairs_offset)); + if (unlikely(ret)) { + if (ret != -ENOSPC) { + ntfs_error(vol->sb, "Failed to resize attribute " + "record for mft bitmap attribute."); + goto undo_alloc; + } + // TODO: Deal with this by moving this extent to a new mft + // record or by starting a new extent in a new mft record or by + // moving other attributes out of this mft record. + ntfs_error(vol->sb, "Not enough space in this mft record to " + "accomodate extended mft bitmap attribute " + "extent. Cannot handle this yet."); + ret = -EOPNOTSUPP; + goto undo_alloc; + } + status.mp_rebuilt = 1; + /* Generate the mapping pairs array directly into the attr record. */ + ret = ntfs_mapping_pairs_build(vol, (u8*)a + + le16_to_cpu(a->data.non_resident.mapping_pairs_offset), + mp_size, rl2, ll, NULL); + if (unlikely(ret)) { + ntfs_error(vol->sb, "Failed to build mapping pairs array for " + "mft bitmap attribute."); + goto undo_alloc; + } + /* Update the highest_vcn. */ + a->data.non_resident.highest_vcn = cpu_to_sle64(rl[1].vcn - 1); + /* + * We now have extended the mft bitmap allocated_size by one cluster. + * Reflect this in the ntfs_inode structure and the attribute record. + */ + if (a->data.non_resident.lowest_vcn) { + /* + * We are not in the first attribute extent, switch to it, but + * first ensure the changes will make it to disk later. + */ + flush_dcache_mft_record_page(ctx->ntfs_ino); + mark_mft_record_dirty(ctx->ntfs_ino); + ntfs_attr_reinit_search_ctx(ctx); + ret = ntfs_attr_lookup(mftbmp_ni->type, mftbmp_ni->name, + mftbmp_ni->name_len, CASE_SENSITIVE, 0, NULL, + 0, ctx); + if (unlikely(ret)) { + ntfs_error(vol->sb, "Failed to find first attribute " + "extent of mft bitmap attribute."); + goto restore_undo_alloc; + } + a = ctx->attr; + } + mftbmp_ni->allocated_size += vol->cluster_size; + a->data.non_resident.allocated_size = + cpu_to_sle64(mftbmp_ni->allocated_size); + /* Ensure the changes make it to disk. */ + flush_dcache_mft_record_page(ctx->ntfs_ino); + mark_mft_record_dirty(ctx->ntfs_ino); + ntfs_attr_put_search_ctx(ctx); + unmap_mft_record(mft_ni); + up_write(&mftbmp_ni->runlist.lock); + ntfs_debug("Done."); + return 0; +restore_undo_alloc: + ntfs_attr_reinit_search_ctx(ctx); + if (ntfs_attr_lookup(mftbmp_ni->type, mftbmp_ni->name, + mftbmp_ni->name_len, CASE_SENSITIVE, rl[1].vcn, NULL, + 0, ctx)) { + ntfs_error(vol->sb, "Failed to find last attribute extent of " + "mft bitmap attribute.%s", es); + mftbmp_ni->allocated_size += vol->cluster_size; + ntfs_attr_put_search_ctx(ctx); + unmap_mft_record(mft_ni); + up_write(&mftbmp_ni->runlist.lock); + /* + * The only thing that is now wrong is ->allocated_size of the + * base attribute extent which chkdsk should be able to fix. + */ + NVolSetErrors(vol); + return ret; + } + a = ctx->attr; + a->data.non_resident.highest_vcn = cpu_to_sle64(rl[1].vcn - 2); +undo_alloc: + if (status.added_cluster) { + /* Truncate the last run in the runlist by one cluster. */ + rl->length--; + rl[1].vcn--; + } else if (status.added_run) { + lcn = rl->lcn; + /* Remove the last run from the runlist. */ + rl->lcn = rl[1].lcn; + rl->length = 0; + } + /* Deallocate the cluster. */ + down_write(&vol->lcnbmp_lock); + if (ntfs_bitmap_clear_bit(vol->lcnbmp_ino, lcn)) { + ntfs_error(vol->sb, "Failed to free allocated cluster.%s", es); + NVolSetErrors(vol); + } + up_write(&vol->lcnbmp_lock); + if (status.mp_rebuilt) { + if (ntfs_mapping_pairs_build(vol, (u8*)a + le16_to_cpu( + a->data.non_resident.mapping_pairs_offset), + old_alen - le16_to_cpu( + a->data.non_resident.mapping_pairs_offset), + rl2, ll, NULL)) { + ntfs_error(vol->sb, "Failed to restore mapping pairs " + "array.%s", es); + NVolSetErrors(vol); + } + if (ntfs_attr_record_resize(ctx->mrec, a, old_alen)) { + ntfs_error(vol->sb, "Failed to restore attribute " + "record.%s", es); + NVolSetErrors(vol); + } + flush_dcache_mft_record_page(ctx->ntfs_ino); + mark_mft_record_dirty(ctx->ntfs_ino); + } + if (ctx) + ntfs_attr_put_search_ctx(ctx); + if (!IS_ERR(mrec)) + unmap_mft_record(mft_ni); + up_write(&mftbmp_ni->runlist.lock); + return ret; +} + +/** + * ntfs_mft_bitmap_extend_initialized_nolock - extend mftbmp initialized data + * @vol: volume on which to extend the mft bitmap attribute + * + * Extend the initialized portion of the mft bitmap attribute on the ntfs + * volume @vol by 8 bytes. + * + * Note: Only changes initialized_size and data_size, i.e. requires that + * allocated_size is big enough to fit the new initialized_size. + * + * Return 0 on success and -error on error. + * + * Locking: Caller must hold vol->mftbmp_lock for writing. + */ +static int ntfs_mft_bitmap_extend_initialized_nolock(ntfs_volume *vol) +{ + s64 old_data_size, old_initialized_size; + struct inode *mftbmp_vi; + ntfs_inode *mft_ni, *mftbmp_ni; + ntfs_attr_search_ctx *ctx; + MFT_RECORD *mrec; + ATTR_RECORD *a; + int ret; + + ntfs_debug("Extending mft bitmap initiailized (and data) size."); + mft_ni = NTFS_I(vol->mft_ino); + mftbmp_vi = vol->mftbmp_ino; + mftbmp_ni = NTFS_I(mftbmp_vi); + /* Get the attribute record. */ + mrec = map_mft_record(mft_ni); + if (IS_ERR(mrec)) { + ntfs_error(vol->sb, "Failed to map mft record."); + return PTR_ERR(mrec); + } + ctx = ntfs_attr_get_search_ctx(mft_ni, mrec); + if (unlikely(!ctx)) { + ntfs_error(vol->sb, "Failed to get search context."); + ret = -ENOMEM; + goto unm_err_out; + } + ret = ntfs_attr_lookup(mftbmp_ni->type, mftbmp_ni->name, + mftbmp_ni->name_len, CASE_SENSITIVE, 0, NULL, 0, ctx); + if (unlikely(ret)) { + ntfs_error(vol->sb, "Failed to find first attribute extent of " + "mft bitmap attribute."); + if (ret == -ENOENT) + ret = -EIO; + goto put_err_out; + } + a = ctx->attr; + old_data_size = mftbmp_vi->i_size; + old_initialized_size = mftbmp_ni->initialized_size; + /* + * We can simply update the initialized_size before filling the space + * with zeroes because the caller is holding the mft bitmap lock for + * writing which ensures that no one else is trying to access the data. + */ + mftbmp_ni->initialized_size += 8; + a->data.non_resident.initialized_size = + cpu_to_sle64(mftbmp_ni->initialized_size); + if (mftbmp_ni->initialized_size > mftbmp_vi->i_size) { + mftbmp_vi->i_size = mftbmp_ni->initialized_size; + a->data.non_resident.data_size = + cpu_to_sle64(mftbmp_vi->i_size); + } + /* Ensure the changes make it to disk. */ + flush_dcache_mft_record_page(ctx->ntfs_ino); + mark_mft_record_dirty(ctx->ntfs_ino); + ntfs_attr_put_search_ctx(ctx); + unmap_mft_record(mft_ni); + /* Initialize the mft bitmap attribute value with zeroes. */ + ret = ntfs_attr_set(mftbmp_ni, old_initialized_size, 8, 0); + if (likely(!ret)) { + ntfs_debug("Done. (Wrote eight initialized bytes to mft " + "bitmap."); + return 0; + } + ntfs_error(vol->sb, "Failed to write to mft bitmap."); + /* Try to recover from the error. */ + mrec = map_mft_record(mft_ni); + if (IS_ERR(mrec)) { + ntfs_error(vol->sb, "Failed to map mft record.%s", es); + NVolSetErrors(vol); + return ret; + } + ctx = ntfs_attr_get_search_ctx(mft_ni, mrec); + if (unlikely(!ctx)) { + ntfs_error(vol->sb, "Failed to get search context.%s", es); + NVolSetErrors(vol); + goto unm_err_out; + } + if (ntfs_attr_lookup(mftbmp_ni->type, mftbmp_ni->name, + mftbmp_ni->name_len, CASE_SENSITIVE, 0, NULL, 0, ctx)) { + ntfs_error(vol->sb, "Failed to find first attribute extent of " + "mft bitmap attribute.%s", es); + NVolSetErrors(vol); +put_err_out: + ntfs_attr_put_search_ctx(ctx); +unm_err_out: + unmap_mft_record(mft_ni); + goto err_out; + } + a = ctx->attr; + mftbmp_ni->initialized_size = old_initialized_size; + a->data.non_resident.initialized_size = + cpu_to_sle64(old_initialized_size); + if (mftbmp_vi->i_size != old_data_size) { + mftbmp_vi->i_size = old_data_size; + a->data.non_resident.data_size = cpu_to_sle64(old_data_size); + } + flush_dcache_mft_record_page(ctx->ntfs_ino); + mark_mft_record_dirty(ctx->ntfs_ino); + ntfs_attr_put_search_ctx(ctx); + unmap_mft_record(mft_ni); + ntfs_debug("Restored status of mftbmp: allocated_size 0x%llx, " + "data_size 0x%llx, initialized_size 0x%llx.", + (long long)mftbmp_ni->allocated_size, + (long long)mftbmp_vi->i_size, + (long long)mftbmp_ni->initialized_size); +err_out: + return ret; +} + +/** + * ntfs_mft_data_extend_allocation_nolock - extend mft data attribute + * @vol: volume on which to extend the mft data attribute + * + * Extend the mft data attribute on the ntfs volume @vol by 16 mft records + * worth of clusters or if not enough space for this by one mft record worth + * of clusters. + * + * Note: Only changes allocated_size, i.e. does not touch initialized_size or + * data_size. + * + * Return 0 on success and -errno on error. + * + * Locking: - Caller must hold vol->mftbmp_lock for writing. + * - This function takes NTFS_I(vol->mft_ino)->runlist.lock for + * writing and releases it before returning. + * - This function calls functions which take vol->lcnbmp_lock for + * writing and release it before returning. + */ +static int ntfs_mft_data_extend_allocation_nolock(ntfs_volume *vol) +{ + LCN lcn; + VCN old_last_vcn; + s64 min_nr, nr, ll = 0; + ntfs_inode *mft_ni; + runlist_element *rl, *rl2; + ntfs_attr_search_ctx *ctx = NULL; + MFT_RECORD *mrec; + ATTR_RECORD *a = NULL; + int ret, mp_size; + u32 old_alen = 0; + BOOL mp_rebuilt = FALSE; + + ntfs_debug("Extending mft data allocation."); + mft_ni = NTFS_I(vol->mft_ino); + /* + * Determine the preferred allocation location, i.e. the last lcn of + * the mft data attribute. The allocated size of the mft data + * attribute cannot be zero so we are ok to do this. + * ntfs_find_vcn() returns the runlist locked on success. + */ + rl = ntfs_find_vcn(mft_ni, (mft_ni->allocated_size - 1) >> + vol->cluster_size_bits, TRUE); + if (unlikely(IS_ERR(rl) || !rl->length || rl->lcn < 0)) { + ntfs_error(vol->sb, "Failed to determine last allocated " + "cluster of mft data attribute."); + if (!IS_ERR(rl)) { + up_write(&mft_ni->runlist.lock); + ret = -EIO; + } else + ret = PTR_ERR(rl); + return ret; + } + lcn = rl->lcn + rl->length; + ntfs_debug("Last lcn of mft data attribute is 0x%llx.", + (long long)lcn); + /* Minimum allocation is one mft record worth of clusters. */ + min_nr = vol->mft_record_size >> vol->cluster_size_bits; + if (!min_nr) + min_nr = 1; + /* Want to allocate 16 mft records worth of clusters. */ + nr = vol->mft_record_size << 4 >> vol->cluster_size_bits; + if (!nr) + nr = min_nr; + /* Ensure we do not go above 2^32-1 mft records. */ + if (unlikely((mft_ni->allocated_size + + (nr << vol->cluster_size_bits)) >> + vol->mft_record_size_bits >= (1ll << 32))) { + nr = min_nr; + if (unlikely((mft_ni->allocated_size + + (nr << vol->cluster_size_bits)) >> + vol->mft_record_size_bits >= (1ll << 32))) { + ntfs_warning(vol->sb, "Cannot allocate mft record " + "because the maximum number of inodes " + "(2^32) has already been reached."); + up_write(&mft_ni->runlist.lock); + return -ENOSPC; + } + } + ntfs_debug("Trying mft data allocation with %s cluster count %lli.", + nr > min_nr ? "default" : "minimal", (long long)nr); + old_last_vcn = rl[1].vcn; + do { + rl2 = ntfs_cluster_alloc(vol, old_last_vcn, nr, lcn, MFT_ZONE); + if (likely(!IS_ERR(rl2))) + break; + if (PTR_ERR(rl2) != -ENOSPC || nr == min_nr) { + ntfs_error(vol->sb, "Failed to allocate the minimal " + "number of clusters (%lli) for the " + "mft data attribute.", (long long)nr); + up_write(&mft_ni->runlist.lock); + return PTR_ERR(rl2); + } + /* + * There is not enough space to do the allocation, but there + * might be enough space to do a minimal allocation so try that + * before failing. + */ + nr = min_nr; + ntfs_debug("Retrying mft data allocation with minimal cluster " + "count %lli.", (long long)nr); + } while (1); + rl = ntfs_runlists_merge(mft_ni->runlist.rl, rl2); + if (IS_ERR(rl)) { + up_write(&mft_ni->runlist.lock); + ntfs_error(vol->sb, "Failed to merge runlists for mft data " + "attribute."); + if (ntfs_cluster_free_from_rl(vol, rl2)) { + ntfs_error(vol->sb, "Failed to dealocate clusters " + "from the mft data attribute.%s", es); + NVolSetErrors(vol); + } + ntfs_free(rl2); + return PTR_ERR(rl); + } + mft_ni->runlist.rl = rl; + ntfs_debug("Allocated %lli clusters.", nr); + /* Find the last run in the new runlist. */ + for (; rl[1].length; rl++) + ; + /* Update the attribute record as well. */ + mrec = map_mft_record(mft_ni); + if (IS_ERR(mrec)) { + ntfs_error(vol->sb, "Failed to map mft record."); + ret = PTR_ERR(mrec); + goto undo_alloc; + } + ctx = ntfs_attr_get_search_ctx(mft_ni, mrec); + if (unlikely(!ctx)) { + ntfs_error(vol->sb, "Failed to get search context."); + ret = -ENOMEM; + goto undo_alloc; + } + ret = ntfs_attr_lookup(mft_ni->type, mft_ni->name, mft_ni->name_len, + CASE_SENSITIVE, rl[1].vcn, NULL, 0, ctx); + if (unlikely(ret)) { + ntfs_error(vol->sb, "Failed to find last attribute extent of " + "mft data attribute."); + if (ret == -ENOENT) + ret = -EIO; + goto undo_alloc; + } + a = ctx->attr; + ll = sle64_to_cpu(a->data.non_resident.lowest_vcn); + /* Search back for the previous last allocated cluster of mft bitmap. */ + for (rl2 = rl; rl2 > mft_ni->runlist.rl; rl2--) { + if (ll >= rl2->vcn) + break; + } + BUG_ON(ll < rl2->vcn); + BUG_ON(ll >= rl2->vcn + rl2->length); + /* Get the size for the new mapping pairs array for this extent. */ + mp_size = ntfs_get_size_for_mapping_pairs(vol, rl2, ll); + if (unlikely(mp_size <= 0)) { + ntfs_error(vol->sb, "Get size for mapping pairs failed for " + "mft data attribute extent."); + ret = mp_size; + if (!ret) + ret = -EIO; + goto undo_alloc; + } + /* Expand the attribute record if necessary. */ + old_alen = le32_to_cpu(a->length); + ret = ntfs_attr_record_resize(ctx->mrec, a, mp_size + + le16_to_cpu(a->data.non_resident.mapping_pairs_offset)); + if (unlikely(ret)) { + if (ret != -ENOSPC) { + ntfs_error(vol->sb, "Failed to resize attribute " + "record for mft data attribute."); + goto undo_alloc; + } + // TODO: Deal with this by moving this extent to a new mft + // record or by starting a new extent in a new mft record or by + // moving other attributes out of this mft record. + // Note: Use the special reserved mft records and ensure that + // this extent is not required to find the mft record in + // question. + ntfs_error(vol->sb, "Not enough space in this mft record to " + "accomodate extended mft data attribute " + "extent. Cannot handle this yet."); + ret = -EOPNOTSUPP; + goto undo_alloc; + } + mp_rebuilt = TRUE; + /* Generate the mapping pairs array directly into the attr record. */ + ret = ntfs_mapping_pairs_build(vol, (u8*)a + + le16_to_cpu(a->data.non_resident.mapping_pairs_offset), + mp_size, rl2, ll, NULL); + if (unlikely(ret)) { + ntfs_error(vol->sb, "Failed to build mapping pairs array of " + "mft data attribute."); + goto undo_alloc; + } + /* Update the highest_vcn. */ + a->data.non_resident.highest_vcn = cpu_to_sle64(rl[1].vcn - 1); + /* + * We now have extended the mft data allocated_size by nr clusters. + * Reflect this in the ntfs_inode structure and the attribute record. + * @rl is the last (non-terminator) runlist element of mft data + * attribute. + */ + if (a->data.non_resident.lowest_vcn) { + /* + * We are not in the first attribute extent, switch to it, but + * first ensure the changes will make it to disk later. + */ + flush_dcache_mft_record_page(ctx->ntfs_ino); + mark_mft_record_dirty(ctx->ntfs_ino); + ntfs_attr_reinit_search_ctx(ctx); + ret = ntfs_attr_lookup(mft_ni->type, mft_ni->name, + mft_ni->name_len, CASE_SENSITIVE, 0, NULL, 0, + ctx); + if (unlikely(ret)) { + ntfs_error(vol->sb, "Failed to find first attribute " + "extent of mft data attribute."); + goto restore_undo_alloc; + } + a = ctx->attr; + } + mft_ni->allocated_size += nr << vol->cluster_size_bits; + a->data.non_resident.allocated_size = + cpu_to_sle64(mft_ni->allocated_size); + /* Ensure the changes make it to disk. */ + flush_dcache_mft_record_page(ctx->ntfs_ino); + mark_mft_record_dirty(ctx->ntfs_ino); + ntfs_attr_put_search_ctx(ctx); + unmap_mft_record(mft_ni); + up_write(&mft_ni->runlist.lock); + ntfs_debug("Done."); + return 0; +restore_undo_alloc: + ntfs_attr_reinit_search_ctx(ctx); + if (ntfs_attr_lookup(mft_ni->type, mft_ni->name, mft_ni->name_len, + CASE_SENSITIVE, rl[1].vcn, NULL, 0, ctx)) { + ntfs_error(vol->sb, "Failed to find last attribute extent of " + "mft data attribute.%s", es); + mft_ni->allocated_size += nr << vol->cluster_size_bits; + ntfs_attr_put_search_ctx(ctx); + unmap_mft_record(mft_ni); + up_write(&mft_ni->runlist.lock); + /* + * The only thing that is now wrong is ->allocated_size of the + * base attribute extent which chkdsk should be able to fix. + */ + NVolSetErrors(vol); + return ret; + } + a = ctx->attr; + a->data.non_resident.highest_vcn = cpu_to_sle64(old_last_vcn - 1); +undo_alloc: + if (ntfs_cluster_free(vol->mft_ino, old_last_vcn, -1) < 0) { + ntfs_error(vol->sb, "Failed to free clusters from mft data " + "attribute.%s", es); + NVolSetErrors(vol); + } + if (ntfs_rl_truncate_nolock(vol, &mft_ni->runlist, old_last_vcn)) { + ntfs_error(vol->sb, "Failed to truncate mft data attribute " + "runlist.%s", es); + NVolSetErrors(vol); + } + if (mp_rebuilt) { + if (ntfs_mapping_pairs_build(vol, (u8*)a + le16_to_cpu( + a->data.non_resident.mapping_pairs_offset), + old_alen - le16_to_cpu( + a->data.non_resident.mapping_pairs_offset), + rl2, ll, NULL)) { + ntfs_error(vol->sb, "Failed to restore mapping pairs " + "array.%s", es); + NVolSetErrors(vol); + } + if (ntfs_attr_record_resize(ctx->mrec, a, old_alen)) { + ntfs_error(vol->sb, "Failed to restore attribute " + "record.%s", es); + NVolSetErrors(vol); + } + flush_dcache_mft_record_page(ctx->ntfs_ino); + mark_mft_record_dirty(ctx->ntfs_ino); + } + if (ctx) + ntfs_attr_put_search_ctx(ctx); + if (!IS_ERR(mrec)) + unmap_mft_record(mft_ni); + up_write(&mft_ni->runlist.lock); + return ret; +} + +/** + * ntfs_mft_record_layout - layout an mft record into a memory buffer + * @vol: volume to which the mft record will belong + * @mft_no: mft reference specifying the mft record number + * @m: destination buffer of size >= @vol->mft_record_size bytes + * + * Layout an empty, unused mft record with the mft record number @mft_no into + * the buffer @m. The volume @vol is needed because the mft record structure + * was modified in NTFS 3.1 so we need to know which volume version this mft + * record will be used on. + * + * Return 0 on success and -errno on error. + */ +static int ntfs_mft_record_layout(const ntfs_volume *vol, const s64 mft_no, + MFT_RECORD *m) +{ + ATTR_RECORD *a; + + ntfs_debug("Entering for mft record 0x%llx.", (long long)mft_no); + if (mft_no >= (1ll << 32)) { + ntfs_error(vol->sb, "Mft record number 0x%llx exceeds " + "maximum of 2^32.", (long long)mft_no); + return -ERANGE; + } + /* Start by clearing the whole mft record to gives us a clean slate. */ + memset(m, 0, vol->mft_record_size); + /* Aligned to 2-byte boundary. */ + if (vol->major_ver < 3 || (vol->major_ver == 3 && !vol->minor_ver)) + m->usa_ofs = cpu_to_le16((sizeof(MFT_RECORD_OLD) + 1) & ~1); + else { + m->usa_ofs = cpu_to_le16((sizeof(MFT_RECORD) + 1) & ~1); + /* + * Set the NTFS 3.1+ specific fields while we know that the + * volume version is 3.1+. + */ + m->reserved = 0; + m->mft_record_number = cpu_to_le32((u32)mft_no); + } + m->magic = magic_FILE; + if (vol->mft_record_size >= NTFS_BLOCK_SIZE) + m->usa_count = cpu_to_le16(vol->mft_record_size / + NTFS_BLOCK_SIZE + 1); + else { + m->usa_count = cpu_to_le16(1); + ntfs_warning(vol->sb, "Sector size is bigger than mft record " + "size. Setting usa_count to 1. If chkdsk " + "reports this as corruption, please email " + "linux-ntfs-dev@lists.sourceforge.net stating " + "that you saw this message and that the " + "modified file system created was corrupt. " + "Thank you."); + } + /* Set the update sequence number to 1. */ + *(le16*)((u8*)m + le16_to_cpu(m->usa_ofs)) = cpu_to_le16(1); + m->lsn = 0; + m->sequence_number = cpu_to_le16(1); + m->link_count = 0; + /* + * Place the attributes straight after the update sequence array, + * aligned to 8-byte boundary. + */ + m->attrs_offset = cpu_to_le16((le16_to_cpu(m->usa_ofs) + + (le16_to_cpu(m->usa_count) << 1) + 7) & ~7); + m->flags = 0; + /* + * Using attrs_offset plus eight bytes (for the termination attribute). + * attrs_offset is already aligned to 8-byte boundary, so no need to + * align again. + */ + m->bytes_in_use = cpu_to_le32(le16_to_cpu(m->attrs_offset) + 8); + m->bytes_allocated = cpu_to_le32(vol->mft_record_size); + m->base_mft_record = 0; + m->next_attr_instance = 0; + /* Add the termination attribute. */ + a = (ATTR_RECORD*)((u8*)m + le16_to_cpu(m->attrs_offset)); + a->type = AT_END; + a->length = 0; + ntfs_debug("Done."); + return 0; +} + +/** + * ntfs_mft_record_format - format an mft record on an ntfs volume + * @vol: volume on which to format the mft record + * @mft_no: mft record number to format + * + * Format the mft record @mft_no in $MFT/$DATA, i.e. lay out an empty, unused + * mft record into the appropriate place of the mft data attribute. This is + * used when extending the mft data attribute. + * + * Return 0 on success and -errno on error. + */ +static int ntfs_mft_record_format(const ntfs_volume *vol, const s64 mft_no) +{ + struct inode *mft_vi = vol->mft_ino; + struct page *page; + MFT_RECORD *m; + pgoff_t index, end_index; + unsigned int ofs; + int err; + + ntfs_debug("Entering for mft record 0x%llx.", (long long)mft_no); + /* + * The index into the page cache and the offset within the page cache + * page of the wanted mft record. + */ + index = mft_no << vol->mft_record_size_bits >> PAGE_CACHE_SHIFT; + ofs = (mft_no << vol->mft_record_size_bits) & ~PAGE_CACHE_MASK; + /* The maximum valid index into the page cache for $MFT's data. */ + end_index = mft_vi->i_size >> PAGE_CACHE_SHIFT; + if (unlikely(index >= end_index)) { + if (unlikely(index > end_index || ofs + vol->mft_record_size >= + (mft_vi->i_size & ~PAGE_CACHE_MASK))) { + ntfs_error(vol->sb, "Tried to format non-existing mft " + "record 0x%llx.", (long long)mft_no); + return -ENOENT; + } + } + /* Read, map, and pin the page containing the mft record. */ + page = ntfs_map_page(mft_vi->i_mapping, index); + if (unlikely(IS_ERR(page))) { + ntfs_error(vol->sb, "Failed to map page containing mft record " + "to format 0x%llx.", (long long)mft_no); + return PTR_ERR(page); + } + lock_page(page); + BUG_ON(!PageUptodate(page)); + ClearPageUptodate(page); + m = (MFT_RECORD*)((u8*)page_address(page) + ofs); + err = ntfs_mft_record_layout(vol, mft_no, m); + if (unlikely(err)) { + ntfs_error(vol->sb, "Failed to layout mft record 0x%llx.", + (long long)mft_no); + SetPageUptodate(page); + unlock_page(page); + ntfs_unmap_page(page); + return err; + } + flush_dcache_page(page); + SetPageUptodate(page); + unlock_page(page); + /* + * Make sure the mft record is written out to disk. We could use + * ilookup5() to check if an inode is in icache and so on but this is + * unnecessary as ntfs_writepage() will write the dirty record anyway. + */ + mark_ntfs_record_dirty(page, ofs); + ntfs_unmap_page(page); + ntfs_debug("Done."); + return 0; +} + +/** + * ntfs_mft_record_alloc - allocate an mft record on an ntfs volume + * @vol: [IN] volume on which to allocate the mft record + * @mode: [IN] mode if want a file or directory, i.e. base inode or 0 + * @base_ni: [IN] open base inode if allocating an extent mft record or NULL + * @mrec: [OUT] on successful return this is the mapped mft record + * + * Allocate an mft record in $MFT/$DATA of an open ntfs volume @vol. + * + * If @base_ni is NULL make the mft record a base mft record, i.e. a file or + * direvctory inode, and allocate it at the default allocator position. In + * this case @mode is the file mode as given to us by the caller. We in + * particular use @mode to distinguish whether a file or a directory is being + * created (S_IFDIR(mode) and S_IFREG(mode), respectively). + * + * If @base_ni is not NULL make the allocated mft record an extent record, + * allocate it starting at the mft record after the base mft record and attach + * the allocated and opened ntfs inode to the base inode @base_ni. In this + * case @mode must be 0 as it is meaningless for extent inodes. + * + * You need to check the return value with IS_ERR(). If false, the function + * was successful and the return value is the now opened ntfs inode of the + * allocated mft record. *@mrec is then set to the allocated, mapped, pinned, + * and locked mft record. If IS_ERR() is true, the function failed and the + * error code is obtained from PTR_ERR(return value). *@mrec is undefined in + * this case. + * + * Allocation strategy: + * + * To find a free mft record, we scan the mft bitmap for a zero bit. To + * optimize this we start scanning at the place specified by @base_ni or if + * @base_ni is NULL we start where we last stopped and we perform wrap around + * when we reach the end. Note, we do not try to allocate mft records below + * number 24 because numbers 0 to 15 are the defined system files anyway and 16 + * to 24 are special in that they are used for storing extension mft records + * for the $DATA attribute of $MFT. This is required to avoid the possibility + * of creating a runlist with a circular dependency which once written to disk + * can never be read in again. Windows will only use records 16 to 24 for + * normal files if the volume is completely out of space. We never use them + * which means that when the volume is really out of space we cannot create any + * more files while Windows can still create up to 8 small files. We can start + * doing this at some later time, it does not matter much for now. + * + * When scanning the mft bitmap, we only search up to the last allocated mft + * record. If there are no free records left in the range 24 to number of + * allocated mft records, then we extend the $MFT/$DATA attribute in order to + * create free mft records. We extend the allocated size of $MFT/$DATA by 16 + * records at a time or one cluster, if cluster size is above 16kiB. If there + * is not sufficient space to do this, we try to extend by a single mft record + * or one cluster, if cluster size is above the mft record size. + * + * No matter how many mft records we allocate, we initialize only the first + * allocated mft record, incrementing mft data size and initialized size + * accordingly, open an ntfs_inode for it and return it to the caller, unless + * there are less than 24 mft records, in which case we allocate and initialize + * mft records until we reach record 24 which we consider as the first free mft + * record for use by normal files. + * + * If during any stage we overflow the initialized data in the mft bitmap, we + * extend the initialized size (and data size) by 8 bytes, allocating another + * cluster if required. The bitmap data size has to be at least equal to the + * number of mft records in the mft, but it can be bigger, in which case the + * superflous bits are padded with zeroes. + * + * Thus, when we return successfully (IS_ERR() is false), we will have: + * - initialized / extended the mft bitmap if necessary, + * - initialized / extended the mft data if necessary, + * - set the bit corresponding to the mft record being allocated in the + * mft bitmap, + * - opened an ntfs_inode for the allocated mft record, and we will have + * - returned the ntfs_inode as well as the allocated mapped, pinned, and + * locked mft record. + * + * On error, the volume will be left in a consistent state and no record will + * be allocated. If rolling back a partial operation fails, we may leave some + * inconsistent metadata in which case we set NVolErrors() so the volume is + * left dirty when unmounted. + * + * Note, this function cannot make use of most of the normal functions, like + * for example for attribute resizing, etc, because when the run list overflows + * the base mft record and an attribute list is used, it is very important that + * the extension mft records used to store the $DATA attribute of $MFT can be + * reached without having to read the information contained inside them, as + * this would make it impossible to find them in the first place after the + * volume is unmounted. $MFT/$BITMAP probably does not need to follow this + * rule because the bitmap is not essential for finding the mft records, but on + * the other hand, handling the bitmap in this special way would make life + * easier because otherwise there might be circular invocations of functions + * when reading the bitmap. + */ +ntfs_inode *ntfs_mft_record_alloc(ntfs_volume *vol, const int mode, + ntfs_inode *base_ni, MFT_RECORD **mrec) +{ + s64 ll, bit, old_data_initialized, old_data_size; + struct inode *vi; + struct page *page; + ntfs_inode *mft_ni, *mftbmp_ni, *ni; + ntfs_attr_search_ctx *ctx; + MFT_RECORD *m; + ATTR_RECORD *a; + pgoff_t index; + unsigned int ofs; + int err; + le16 seq_no, usn; + BOOL record_formatted = FALSE; + + if (base_ni) { + ntfs_debug("Entering (allocating an extent mft record for " + "base mft record 0x%llx).", + (long long)base_ni->mft_no); + /* @mode and @base_ni are mutually exclusive. */ + BUG_ON(mode); + } else + ntfs_debug("Entering (allocating a base mft record)."); + if (mode) { + /* @mode and @base_ni are mutually exclusive. */ + BUG_ON(base_ni); + /* We only support creation of normal files and directories. */ + if (!S_ISREG(mode) && !S_ISDIR(mode)) + return ERR_PTR(-EOPNOTSUPP); + } + BUG_ON(!mrec); + mft_ni = NTFS_I(vol->mft_ino); + mftbmp_ni = NTFS_I(vol->mftbmp_ino); + down_write(&vol->mftbmp_lock); + bit = ntfs_mft_bitmap_find_and_alloc_free_rec_nolock(vol, base_ni); + if (bit >= 0) { + ntfs_debug("Found and allocated free record (#1), bit 0x%llx.", + (long long)bit); + goto have_alloc_rec; + } + if (bit != -ENOSPC) { + up_write(&vol->mftbmp_lock); + return ERR_PTR(bit); + } + /* + * No free mft records left. If the mft bitmap already covers more + * than the currently used mft records, the next records are all free, + * so we can simply allocate the first unused mft record. + * Note: We also have to make sure that the mft bitmap at least covers + * the first 24 mft records as they are special and whilst they may not + * be in use, we do not allocate from them. + */ + ll = mft_ni->initialized_size >> vol->mft_record_size_bits; + if (mftbmp_ni->initialized_size << 3 > ll && + mftbmp_ni->initialized_size > 3) { + bit = ll; + if (bit < 24) + bit = 24; + if (unlikely(bit >= (1ll << 32))) + goto max_err_out; + ntfs_debug("Found free record (#2), bit 0x%llx.", + (long long)bit); + goto found_free_rec; + } + /* + * The mft bitmap needs to be expanded until it covers the first unused + * mft record that we can allocate. + * Note: The smallest mft record we allocate is mft record 24. + */ + bit = mftbmp_ni->initialized_size << 3; + if (unlikely(bit >= (1ll << 32))) + goto max_err_out; + ntfs_debug("Status of mftbmp before extension: allocated_size 0x%llx, " + "data_size 0x%llx, initialized_size 0x%llx.", + (long long)mftbmp_ni->allocated_size, + (long long)vol->mftbmp_ino->i_size, + (long long)mftbmp_ni->initialized_size); + if (mftbmp_ni->initialized_size + 8 > mftbmp_ni->allocated_size) { + /* Need to extend bitmap by one more cluster. */ + ntfs_debug("mftbmp: initialized_size + 8 > allocated_size."); + err = ntfs_mft_bitmap_extend_allocation_nolock(vol); + if (unlikely(err)) { + up_write(&vol->mftbmp_lock); + goto err_out; + } + ntfs_debug("Status of mftbmp after allocation extension: " + "allocated_size 0x%llx, data_size 0x%llx, " + "initialized_size 0x%llx.", + (long long)mftbmp_ni->allocated_size, + (long long)vol->mftbmp_ino->i_size, + (long long)mftbmp_ni->initialized_size); + } + /* + * We now have sufficient allocated space, extend the initialized_size + * as well as the data_size if necessary and fill the new space with + * zeroes. + */ + err = ntfs_mft_bitmap_extend_initialized_nolock(vol); + if (unlikely(err)) { + up_write(&vol->mftbmp_lock); + goto err_out; + } + ntfs_debug("Status of mftbmp after initialized extention: " + "allocated_size 0x%llx, data_size 0x%llx, " + "initialized_size 0x%llx.", + (long long)mftbmp_ni->allocated_size, + (long long)vol->mftbmp_ino->i_size, + (long long)mftbmp_ni->initialized_size); + ntfs_debug("Found free record (#3), bit 0x%llx.", (long long)bit); +found_free_rec: + /* @bit is the found free mft record, allocate it in the mft bitmap. */ + ntfs_debug("At found_free_rec."); + err = ntfs_bitmap_set_bit(vol->mftbmp_ino, bit); + if (unlikely(err)) { + ntfs_error(vol->sb, "Failed to allocate bit in mft bitmap."); + up_write(&vol->mftbmp_lock); + goto err_out; + } + ntfs_debug("Set bit 0x%llx in mft bitmap.", (long long)bit); +have_alloc_rec: + /* + * The mft bitmap is now uptodate. Deal with mft data attribute now. + * Note, we keep hold of the mft bitmap lock for writing until all + * modifications to the mft data attribute are complete, too, as they + * will impact decisions for mft bitmap and mft record allocation done + * by a parallel allocation and if the lock is not maintained a + * parallel allocation could allocate the same mft record as this one. + */ + ll = (bit + 1) << vol->mft_record_size_bits; + if (ll <= mft_ni->initialized_size) { + ntfs_debug("Allocated mft record already initialized."); + goto mft_rec_already_initialized; + } + ntfs_debug("Initializing allocated mft record."); + /* + * The mft record is outside the initialized data. Extend the mft data + * attribute until it covers the allocated record. The loop is only + * actually traversed more than once when a freshly formatted volume is + * first written to so it optimizes away nicely in the common case. + */ + ntfs_debug("Status of mft data before extension: " + "allocated_size 0x%llx, data_size 0x%llx, " + "initialized_size 0x%llx.", + (long long)mft_ni->allocated_size, + (long long)vol->mft_ino->i_size, + (long long)mft_ni->initialized_size); + while (ll > mft_ni->allocated_size) { + err = ntfs_mft_data_extend_allocation_nolock(vol); + if (unlikely(err)) { + ntfs_error(vol->sb, "Failed to extend mft data " + "allocation."); + goto undo_mftbmp_alloc_nolock; + } + ntfs_debug("Status of mft data after allocation extension: " + "allocated_size 0x%llx, data_size 0x%llx, " + "initialized_size 0x%llx.", + (long long)mft_ni->allocated_size, + (long long)vol->mft_ino->i_size, + (long long)mft_ni->initialized_size); + } + /* + * Extend mft data initialized size (and data size of course) to reach + * the allocated mft record, formatting the mft records allong the way. + * Note: We only modify the ntfs_inode structure as that is all that is + * needed by ntfs_mft_record_format(). We will update the attribute + * record itself in one fell swoop later on. + */ + old_data_initialized = mft_ni->initialized_size; + old_data_size = vol->mft_ino->i_size; + while (ll > mft_ni->initialized_size) { + s64 new_initialized_size, mft_no; + + new_initialized_size = mft_ni->initialized_size + + vol->mft_record_size; + mft_no = mft_ni->initialized_size >> vol->mft_record_size_bits; + if (new_initialized_size > vol->mft_ino->i_size) + vol->mft_ino->i_size = new_initialized_size; + ntfs_debug("Initializing mft record 0x%llx.", + (long long)mft_no); + err = ntfs_mft_record_format(vol, mft_no); + if (unlikely(err)) { + ntfs_error(vol->sb, "Failed to format mft record."); + goto undo_data_init; + } + mft_ni->initialized_size = new_initialized_size; + } + record_formatted = TRUE; + /* Update the mft data attribute record to reflect the new sizes. */ + m = map_mft_record(mft_ni); + if (IS_ERR(m)) { + ntfs_error(vol->sb, "Failed to map mft record."); + err = PTR_ERR(m); + goto undo_data_init; + } + ctx = ntfs_attr_get_search_ctx(mft_ni, m); + if (unlikely(!ctx)) { + ntfs_error(vol->sb, "Failed to get search context."); + err = -ENOMEM; + unmap_mft_record(mft_ni); + goto undo_data_init; + } + err = ntfs_attr_lookup(mft_ni->type, mft_ni->name, mft_ni->name_len, + CASE_SENSITIVE, 0, NULL, 0, ctx); + if (unlikely(err)) { + ntfs_error(vol->sb, "Failed to find first attribute extent of " + "mft data attribute."); + ntfs_attr_put_search_ctx(ctx); + unmap_mft_record(mft_ni); + goto undo_data_init; + } + a = ctx->attr; + a->data.non_resident.initialized_size = + cpu_to_sle64(mft_ni->initialized_size); + a->data.non_resident.data_size = cpu_to_sle64(vol->mft_ino->i_size); + /* Ensure the changes make it to disk. */ + flush_dcache_mft_record_page(ctx->ntfs_ino); + mark_mft_record_dirty(ctx->ntfs_ino); + ntfs_attr_put_search_ctx(ctx); + unmap_mft_record(mft_ni); + ntfs_debug("Status of mft data after mft record initialization: " + "allocated_size 0x%llx, data_size 0x%llx, " + "initialized_size 0x%llx.", + (long long)mft_ni->allocated_size, + (long long)vol->mft_ino->i_size, + (long long)mft_ni->initialized_size); + BUG_ON(vol->mft_ino->i_size > mft_ni->allocated_size); + BUG_ON(mft_ni->initialized_size > vol->mft_ino->i_size); +mft_rec_already_initialized: + /* + * We can finally drop the mft bitmap lock as the mft data attribute + * has been fully updated. The only disparity left is that the + * allocated mft record still needs to be marked as in use to match the + * set bit in the mft bitmap but this is actually not a problem since + * this mft record is not referenced from anywhere yet and the fact + * that it is allocated in the mft bitmap means that no-one will try to + * allocate it either. + */ + up_write(&vol->mftbmp_lock); + /* + * We now have allocated and initialized the mft record. Calculate the + * index of and the offset within the page cache page the record is in. + */ + index = bit << vol->mft_record_size_bits >> PAGE_CACHE_SHIFT; + ofs = (bit << vol->mft_record_size_bits) & ~PAGE_CACHE_MASK; + /* Read, map, and pin the page containing the mft record. */ + page = ntfs_map_page(vol->mft_ino->i_mapping, index); + if (unlikely(IS_ERR(page))) { + ntfs_error(vol->sb, "Failed to map page containing allocated " + "mft record 0x%llx.", (long long)bit); + err = PTR_ERR(page); + goto undo_mftbmp_alloc; + } + lock_page(page); + BUG_ON(!PageUptodate(page)); + ClearPageUptodate(page); + m = (MFT_RECORD*)((u8*)page_address(page) + ofs); + /* If we just formatted the mft record no need to do it again. */ + if (!record_formatted) { + /* Sanity check that the mft record is really not in use. */ + if (ntfs_is_file_record(m->magic) && + (m->flags & MFT_RECORD_IN_USE)) { + ntfs_error(vol->sb, "Mft record 0x%llx was marked " + "free in mft bitmap but is marked " + "used itself. Corrupt filesystem. " + "Unmount and run chkdsk.", + (long long)bit); + err = -EIO; + SetPageUptodate(page); + unlock_page(page); + ntfs_unmap_page(page); + NVolSetErrors(vol); + goto undo_mftbmp_alloc; + } + /* + * We need to (re-)format the mft record, preserving the + * sequence number if it is not zero as well as the update + * sequence number if it is not zero or -1 (0xffff). This + * means we do not need to care whether or not something went + * wrong with the previous mft record. + */ + seq_no = m->sequence_number; + usn = *(le16*)((u8*)m + le16_to_cpu(m->usa_ofs)); + err = ntfs_mft_record_layout(vol, bit, m); + if (unlikely(err)) { + ntfs_error(vol->sb, "Failed to layout allocated mft " + "record 0x%llx.", (long long)bit); + SetPageUptodate(page); + unlock_page(page); + ntfs_unmap_page(page); + goto undo_mftbmp_alloc; + } + if (seq_no) + m->sequence_number = seq_no; + if (usn && le16_to_cpu(usn) != 0xffff) + *(le16*)((u8*)m + le16_to_cpu(m->usa_ofs)) = usn; + } + /* Set the mft record itself in use. */ + m->flags |= MFT_RECORD_IN_USE; + if (S_ISDIR(mode)) + m->flags |= MFT_RECORD_IS_DIRECTORY; + flush_dcache_page(page); + SetPageUptodate(page); + if (base_ni) { + /* + * Setup the base mft record in the extent mft record. This + * completes initialization of the allocated extent mft record + * and we can simply use it with map_extent_mft_record(). + */ + m->base_mft_record = MK_LE_MREF(base_ni->mft_no, + base_ni->seq_no); + /* + * Allocate an extent inode structure for the new mft record, + * attach it to the base inode @base_ni and map, pin, and lock + * its, i.e. the allocated, mft record. + */ + m = map_extent_mft_record(base_ni, bit, &ni); + if (IS_ERR(m)) { + ntfs_error(vol->sb, "Failed to map allocated extent " + "mft record 0x%llx.", (long long)bit); + err = PTR_ERR(m); + /* Set the mft record itself not in use. */ + m->flags &= cpu_to_le16( + ~le16_to_cpu(MFT_RECORD_IN_USE)); + flush_dcache_page(page); + /* Make sure the mft record is written out to disk. */ + mark_ntfs_record_dirty(page, ofs); + unlock_page(page); + ntfs_unmap_page(page); + goto undo_mftbmp_alloc; + } + /* + * Make sure the allocated mft record is written out to disk. + * No need to set the inode dirty because the caller is going + * to do that anyway after finishing with the new extent mft + * record (e.g. at a minimum a new attribute will be added to + * the mft record. + */ + mark_ntfs_record_dirty(page, ofs); + unlock_page(page); + /* + * Need to unmap the page since map_extent_mft_record() mapped + * it as well so we have it mapped twice at the moment. + */ + ntfs_unmap_page(page); + } else { + /* + * Allocate a new VFS inode and set it up. NOTE: @vi->i_nlink + * is set to 1 but the mft record->link_count is 0. The caller + * needs to bear this in mind. + */ + vi = new_inode(vol->sb); + if (unlikely(!vi)) { + err = -ENOMEM; + /* Set the mft record itself not in use. */ + m->flags &= cpu_to_le16( + ~le16_to_cpu(MFT_RECORD_IN_USE)); + flush_dcache_page(page); + /* Make sure the mft record is written out to disk. */ + mark_ntfs_record_dirty(page, ofs); + unlock_page(page); + ntfs_unmap_page(page); + goto undo_mftbmp_alloc; + } + vi->i_ino = bit; + /* + * This is the optimal IO size (for stat), not the fs block + * size. + */ + vi->i_blksize = PAGE_CACHE_SIZE; + /* + * This is for checking whether an inode has changed w.r.t. a + * file so that the file can be updated if necessary (compare + * with f_version). + */ + vi->i_version = 1; + + /* The owner and group come from the ntfs volume. */ + vi->i_uid = vol->uid; + vi->i_gid = vol->gid; + + /* Initialize the ntfs specific part of @vi. */ + ntfs_init_big_inode(vi); + ni = NTFS_I(vi); + /* + * Set the appropriate mode, attribute type, and name. For + * directories, also setup the index values to the defaults. + */ + if (S_ISDIR(mode)) { + vi->i_mode = S_IFDIR | S_IRWXUGO; + vi->i_mode &= ~vol->dmask; + + NInoSetMstProtected(ni); + ni->type = AT_INDEX_ALLOCATION; + ni->name = I30; + ni->name_len = 4; + + ni->itype.index.block_size = 4096; + ni->itype.index.block_size_bits = generic_ffs(4096) - 1; + ni->itype.index.collation_rule = COLLATION_FILE_NAME; + if (vol->cluster_size <= ni->itype.index.block_size) { + ni->itype.index.vcn_size = vol->cluster_size; + ni->itype.index.vcn_size_bits = + vol->cluster_size_bits; + } else { + ni->itype.index.vcn_size = vol->sector_size; + ni->itype.index.vcn_size_bits = + vol->sector_size_bits; + } + } else { + vi->i_mode = S_IFREG | S_IRWXUGO; + vi->i_mode &= ~vol->fmask; + + ni->type = AT_DATA; + ni->name = NULL; + ni->name_len = 0; + } + if (IS_RDONLY(vi)) + vi->i_mode &= ~S_IWUGO; + + /* Set the inode times to the current time. */ + vi->i_atime = vi->i_mtime = vi->i_ctime = current_kernel_time(); + /* + * Set the file size to 0, the ntfs inode sizes are set to 0 by + * the call to ntfs_init_big_inode() below. + */ + vi->i_size = 0; + vi->i_blocks = 0; + + /* Set the sequence number. */ + vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number); + /* + * Manually map, pin, and lock the mft record as we already + * have its page mapped and it is very easy to do. + */ + atomic_inc(&ni->count); + down(&ni->mrec_lock); + ni->page = page; + ni->page_ofs = ofs; + /* + * Make sure the allocated mft record is written out to disk. + * NOTE: We do not set the ntfs inode dirty because this would + * fail in ntfs_write_inode() because the inode does not have a + * standard information attribute yet. Also, there is no need + * to set the inode dirty because the caller is going to do + * that anyway after finishing with the new mft record (e.g. at + * a minimum some new attributes will be added to the mft + * record. + */ + mark_ntfs_record_dirty(page, ofs); + unlock_page(page); + + /* Add the inode to the inode hash for the superblock. */ + insert_inode_hash(vi); + + /* Update the default mft allocation position. */ + vol->mft_data_pos = bit + 1; + } + /* + * Return the opened, allocated inode of the allocated mft record as + * well as the mapped, pinned, and locked mft record. + */ + ntfs_debug("Returning opened, allocated %sinode 0x%llx.", + base_ni ? "extent " : "", (long long)bit); + *mrec = m; + return ni; +undo_data_init: + mft_ni->initialized_size = old_data_initialized; + vol->mft_ino->i_size = old_data_size; + goto undo_mftbmp_alloc_nolock; +undo_mftbmp_alloc: + down_write(&vol->mftbmp_lock); +undo_mftbmp_alloc_nolock: + if (ntfs_bitmap_clear_bit(vol->mftbmp_ino, bit)) { + ntfs_error(vol->sb, "Failed to clear bit in mft bitmap.%s", es); + NVolSetErrors(vol); + } + up_write(&vol->mftbmp_lock); +err_out: + return ERR_PTR(err); +max_err_out: + ntfs_warning(vol->sb, "Cannot allocate mft record because the maximum " + "number of inodes (2^32) has already been reached."); + up_write(&vol->mftbmp_lock); + return ERR_PTR(-ENOSPC); +} + /** * ntfs_extent_mft_record_free - free an extent mft record on an ntfs volume * @ni: ntfs inode of the mapped extent mft record to free diff --git a/fs/ntfs/mft.h b/fs/ntfs/mft.h index c2c7a018c3f98..407de2cef1d65 100644 --- a/fs/ntfs/mft.h +++ b/fs/ntfs/mft.h @@ -118,6 +118,8 @@ extern BOOL ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no, const MFT_RECORD *m, ntfs_inode **locked_ni); +extern ntfs_inode *ntfs_mft_record_alloc(ntfs_volume *vol, const int mode, + ntfs_inode *base_ni, MFT_RECORD **mrec); extern int ntfs_extent_mft_record_free(ntfs_inode *ni, MFT_RECORD *m); #endif /* NTFS_RW */ -- 2.53.0