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fs/ntfs3: Restore correct state after ENOSPC in attr_data_get_block
Added new function ntfs_check_for_free_space. Added undo mechanism in attr_data_get_block. Fixes xfstest generic/083 Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov
parent
0ad9dfcb8d
commit
910013f7c7
@ -891,8 +891,10 @@ int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn,
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struct ATTR_LIST_ENTRY *le, *le_b;
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struct mft_inode *mi, *mi_b;
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CLST hint, svcn, to_alloc, evcn1, next_svcn, asize, end, vcn0, alen;
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CLST alloc, evcn;
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unsigned fr;
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u64 total_size;
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u64 total_size, total_size0;
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int step = 0;
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if (new)
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*new = false;
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@ -932,7 +934,12 @@ int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn,
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asize = le64_to_cpu(attr_b->nres.alloc_size) >> cluster_bits;
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if (vcn >= asize) {
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err = -EINVAL;
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if (new) {
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err = -EINVAL;
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} else {
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*len = 1;
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*lcn = SPARSE_LCN;
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}
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goto out;
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}
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@ -1036,10 +1043,12 @@ int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn,
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if (err)
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goto out;
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*new = true;
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step = 1;
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end = vcn + alen;
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total_size = le64_to_cpu(attr_b->nres.total_size) +
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((u64)alen << cluster_bits);
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/* Save 'total_size0' to restore if error. */
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total_size0 = le64_to_cpu(attr_b->nres.total_size);
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total_size = total_size0 + ((u64)alen << cluster_bits);
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if (vcn != vcn0) {
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if (!run_lookup_entry(run, vcn0, lcn, len, NULL)) {
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@ -1081,7 +1090,7 @@ int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn,
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if (!ni->attr_list.size) {
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err = ni_create_attr_list(ni);
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if (err)
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goto out;
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goto undo1;
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/* Layout of records is changed. */
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le_b = NULL;
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attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL,
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@ -1098,67 +1107,83 @@ int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn,
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}
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}
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/*
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* The code below may require additional cluster (to extend attribute list)
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* and / or one MFT record
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* It is too complex to undo operations if -ENOSPC occurs deep inside
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* in 'ni_insert_nonresident'.
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* Return in advance -ENOSPC here if there are no free cluster and no free MFT.
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*/
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if (!ntfs_check_for_free_space(sbi, 1, 1)) {
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/* Undo step 1. */
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err = -ENOSPC;
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goto undo1;
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}
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step = 2;
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svcn = evcn1;
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/* Estimate next attribute. */
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attr = ni_find_attr(ni, attr, &le, ATTR_DATA, NULL, 0, &svcn, &mi);
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if (attr) {
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CLST alloc = bytes_to_cluster(
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sbi, le64_to_cpu(attr_b->nres.alloc_size));
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CLST evcn = le64_to_cpu(attr->nres.evcn);
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if (!attr) {
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/* Insert new attribute segment. */
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goto ins_ext;
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}
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if (end < next_svcn)
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end = next_svcn;
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while (end > evcn) {
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/* Remove segment [svcn : evcn). */
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mi_remove_attr(NULL, mi, attr);
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/* Try to update existed attribute segment. */
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alloc = bytes_to_cluster(sbi, le64_to_cpu(attr_b->nres.alloc_size));
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evcn = le64_to_cpu(attr->nres.evcn);
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if (!al_remove_le(ni, le)) {
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err = -EINVAL;
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goto out;
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}
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if (end < next_svcn)
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end = next_svcn;
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while (end > evcn) {
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/* Remove segment [svcn : evcn). */
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mi_remove_attr(NULL, mi, attr);
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if (evcn + 1 >= alloc) {
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/* Last attribute segment. */
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evcn1 = evcn + 1;
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goto ins_ext;
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}
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if (ni_load_mi(ni, le, &mi)) {
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attr = NULL;
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goto out;
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}
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attr = mi_find_attr(mi, NULL, ATTR_DATA, NULL, 0,
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&le->id);
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if (!attr) {
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err = -EINVAL;
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goto out;
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}
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svcn = le64_to_cpu(attr->nres.svcn);
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evcn = le64_to_cpu(attr->nres.evcn);
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if (!al_remove_le(ni, le)) {
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err = -EINVAL;
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goto out;
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}
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if (end < svcn)
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end = svcn;
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if (evcn + 1 >= alloc) {
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/* Last attribute segment. */
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evcn1 = evcn + 1;
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goto ins_ext;
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}
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err = attr_load_runs(attr, ni, run, &end);
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if (err)
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if (ni_load_mi(ni, le, &mi)) {
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attr = NULL;
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goto out;
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}
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evcn1 = evcn + 1;
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attr->nres.svcn = cpu_to_le64(next_svcn);
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err = mi_pack_runs(mi, attr, run, evcn1 - next_svcn);
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if (err)
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attr = mi_find_attr(mi, NULL, ATTR_DATA, NULL, 0, &le->id);
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if (!attr) {
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err = -EINVAL;
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goto out;
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le->vcn = cpu_to_le64(next_svcn);
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ni->attr_list.dirty = true;
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mi->dirty = true;
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next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
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}
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svcn = le64_to_cpu(attr->nres.svcn);
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evcn = le64_to_cpu(attr->nres.evcn);
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}
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if (end < svcn)
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end = svcn;
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err = attr_load_runs(attr, ni, run, &end);
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if (err)
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goto out;
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evcn1 = evcn + 1;
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attr->nres.svcn = cpu_to_le64(next_svcn);
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err = mi_pack_runs(mi, attr, run, evcn1 - next_svcn);
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if (err)
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goto out;
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le->vcn = cpu_to_le64(next_svcn);
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ni->attr_list.dirty = true;
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mi->dirty = true;
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next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
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ins_ext:
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if (evcn1 > next_svcn) {
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err = ni_insert_nonresident(ni, ATTR_DATA, NULL, 0, run,
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@ -1170,10 +1195,26 @@ int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn,
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ok:
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run_truncate_around(run, vcn);
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out:
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if (err && step > 1) {
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/* Too complex to restore. */
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_ntfs_bad_inode(&ni->vfs_inode);
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}
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up_write(&ni->file.run_lock);
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ni_unlock(ni);
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return err;
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undo1:
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/* Undo step1. */
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attr_b->nres.total_size = cpu_to_le64(total_size0);
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inode_set_bytes(&ni->vfs_inode, total_size0);
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if (run_deallocate_ex(sbi, run, vcn, alen, NULL, false) ||
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!run_add_entry(run, vcn, SPARSE_LCN, alen, false) ||
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mi_pack_runs(mi, attr, run, max(end, evcn1) - svcn)) {
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_ntfs_bad_inode(&ni->vfs_inode);
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}
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goto out;
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}
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int attr_data_read_resident(struct ntfs_inode *ni, struct page *page)
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@ -443,6 +443,39 @@ int ntfs_look_for_free_space(struct ntfs_sb_info *sbi, CLST lcn, CLST len,
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return err;
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}
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/*
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* ntfs_check_for_free_space
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*
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* Check if it is possible to allocate 'clen' clusters and 'mlen' Mft records
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*/
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bool ntfs_check_for_free_space(struct ntfs_sb_info *sbi, CLST clen, CLST mlen)
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{
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size_t free, zlen, avail;
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struct wnd_bitmap *wnd;
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wnd = &sbi->used.bitmap;
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down_read_nested(&wnd->rw_lock, BITMAP_MUTEX_CLUSTERS);
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free = wnd_zeroes(wnd);
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zlen = wnd_zone_len(wnd);
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up_read(&wnd->rw_lock);
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if (free < zlen + clen)
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return false;
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avail = free - (zlen + clen);
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wnd = &sbi->mft.bitmap;
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down_read_nested(&wnd->rw_lock, BITMAP_MUTEX_MFT);
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free = wnd_zeroes(wnd);
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zlen = wnd_zone_len(wnd);
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up_read(&wnd->rw_lock);
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if (free >= zlen + mlen)
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return true;
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return avail >= bytes_to_cluster(sbi, mlen << sbi->record_bits);
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}
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/*
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* ntfs_extend_mft - Allocate additional MFT records.
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*
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@ -588,6 +588,7 @@ int ntfs_loadlog_and_replay(struct ntfs_inode *ni, struct ntfs_sb_info *sbi);
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int ntfs_look_for_free_space(struct ntfs_sb_info *sbi, CLST lcn, CLST len,
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CLST *new_lcn, CLST *new_len,
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enum ALLOCATE_OPT opt);
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bool ntfs_check_for_free_space(struct ntfs_sb_info *sbi, CLST clen, CLST mlen);
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int ntfs_look_free_mft(struct ntfs_sb_info *sbi, CLST *rno, bool mft,
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struct ntfs_inode *ni, struct mft_inode **mi);
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void ntfs_mark_rec_free(struct ntfs_sb_info *sbi, CLST rno, bool is_mft);
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