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https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
fs/ntfs3: Refactoring attr_set_size to restore after errors
Added comments to code Added two undo labels for restoring after errors Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov
parent
c12df45ee6
commit
0e5b044cbf
1 changed files with 129 additions and 57 deletions
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@ -173,7 +173,6 @@ int attr_allocate_clusters(struct ntfs_sb_info *sbi, struct runs_tree *run,
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{
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int err;
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CLST flen, vcn0 = vcn, pre = pre_alloc ? *pre_alloc : 0;
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struct wnd_bitmap *wnd = &sbi->used.bitmap;
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size_t cnt = run->count;
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for (;;) {
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@ -196,9 +195,7 @@ int attr_allocate_clusters(struct ntfs_sb_info *sbi, struct runs_tree *run,
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/* Add new fragment into run storage. */
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if (!run_add_entry(run, vcn, lcn, flen, opt == ALLOCATE_MFT)) {
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/* Undo last 'ntfs_look_for_free_space' */
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down_write_nested(&wnd->rw_lock, BITMAP_MUTEX_CLUSTERS);
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wnd_set_free(wnd, lcn, flen);
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up_write(&wnd->rw_lock);
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mark_as_free_ex(sbi, lcn, len, false);
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err = -ENOMEM;
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goto out;
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}
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@ -419,40 +416,44 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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struct mft_inode *mi, *mi_b;
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CLST alen, vcn, lcn, new_alen, old_alen, svcn, evcn;
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CLST next_svcn, pre_alloc = -1, done = 0;
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bool is_ext;
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bool is_ext, is_bad = false;
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u32 align;
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struct MFT_REC *rec;
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again:
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alen = 0;
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le_b = NULL;
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attr_b = ni_find_attr(ni, NULL, &le_b, type, name, name_len, NULL,
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&mi_b);
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if (!attr_b) {
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err = -ENOENT;
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goto out;
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goto bad_inode;
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}
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if (!attr_b->non_res) {
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err = attr_set_size_res(ni, attr_b, le_b, mi_b, new_size, run,
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&attr_b);
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if (err || !attr_b->non_res)
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goto out;
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if (err)
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return err;
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/* Return if file is still resident. */
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if (!attr_b->non_res)
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goto ok1;
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/* Layout of records may be changed, so do a full search. */
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goto again;
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}
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is_ext = is_attr_ext(attr_b);
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again_1:
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align = sbi->cluster_size;
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if (is_ext)
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align <<= attr_b->nres.c_unit;
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old_valid = le64_to_cpu(attr_b->nres.valid_size);
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old_size = le64_to_cpu(attr_b->nres.data_size);
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old_alloc = le64_to_cpu(attr_b->nres.alloc_size);
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again_1:
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old_alen = old_alloc >> cluster_bits;
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new_alloc = (new_size + align - 1) & ~(u64)(align - 1);
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@ -475,24 +476,27 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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mi = mi_b;
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} else if (!le_b) {
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err = -EINVAL;
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goto out;
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goto bad_inode;
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} else {
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le = le_b;
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attr = ni_find_attr(ni, attr_b, &le, type, name, name_len, &vcn,
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&mi);
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if (!attr) {
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err = -EINVAL;
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goto out;
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goto bad_inode;
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}
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next_le_1:
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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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/*
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* Here we have:
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* attr,mi,le - last attribute segment (containing 'vcn').
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* attr_b,mi_b,le_b - base (primary) attribute segment.
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*/
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next_le:
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rec = mi->mrec;
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err = attr_load_runs(attr, ni, run, NULL);
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if (err)
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goto out;
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@ -507,6 +511,13 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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goto ok;
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}
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/*
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* Add clusters. In simple case we have to:
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* - allocate space (vcn, lcn, len)
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* - update packed run in 'mi'
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* - update attr->nres.evcn
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* - update attr_b->nres.data_size/attr_b->nres.alloc_size
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*/
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to_allocate = new_alen - old_alen;
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add_alloc_in_same_attr_seg:
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lcn = 0;
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@ -520,9 +531,11 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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pre_alloc = 0;
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if (type == ATTR_DATA && !name_len &&
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sbi->options->prealloc) {
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CLST new_alen2 = bytes_to_cluster(
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sbi, get_pre_allocated(new_size));
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pre_alloc = new_alen2 - new_alen;
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pre_alloc =
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bytes_to_cluster(
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sbi,
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get_pre_allocated(new_size)) -
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new_alen;
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}
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/* Get the last LCN to allocate from. */
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@ -580,7 +593,7 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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pack_runs:
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err = mi_pack_runs(mi, attr, run, vcn - svcn);
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if (err)
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goto out;
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goto undo_1;
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next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
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new_alloc_tmp = (u64)next_svcn << cluster_bits;
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@ -614,7 +627,7 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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if (type == ATTR_LIST) {
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err = ni_expand_list(ni);
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if (err)
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goto out;
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goto undo_2;
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if (next_svcn < vcn)
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goto pack_runs;
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@ -624,8 +637,9 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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if (!ni->attr_list.size) {
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err = ni_create_attr_list(ni);
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/* In case of error layout of records is not changed. */
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if (err)
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goto out;
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goto undo_2;
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/* Layout of records is changed. */
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}
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@ -638,8 +652,24 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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err = ni_insert_nonresident(ni, type, name, name_len, run,
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next_svcn, vcn - next_svcn,
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attr_b->flags, &attr, &mi, NULL);
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if (err)
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goto out;
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/*
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* Layout of records maybe changed.
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* Find base attribute to update.
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*/
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le_b = NULL;
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attr_b = ni_find_attr(ni, NULL, &le_b, type, name, name_len,
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NULL, &mi_b);
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if (!attr_b) {
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err = -EINVAL;
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goto bad_inode;
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}
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if (err) {
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/* ni_insert_nonresident failed. */
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attr = NULL;
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goto undo_2;
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}
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if (!is_mft)
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run_truncate_head(run, evcn + 1);
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@ -647,38 +677,31 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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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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le_b = NULL;
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/*
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* Layout of records maybe changed.
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* Find base attribute to update.
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* Attribute is in consistency state.
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* Save this point to restore to if next steps fail.
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*/
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attr_b = ni_find_attr(ni, NULL, &le_b, type, name, name_len,
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NULL, &mi_b);
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if (!attr_b) {
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err = -ENOENT;
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goto out;
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}
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attr_b->nres.alloc_size = cpu_to_le64((u64)vcn << cluster_bits);
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attr_b->nres.data_size = attr_b->nres.alloc_size;
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attr_b->nres.valid_size = attr_b->nres.alloc_size;
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old_valid = old_size = old_alloc = (u64)vcn << cluster_bits;
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attr_b->nres.valid_size = attr_b->nres.data_size =
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attr_b->nres.alloc_size = cpu_to_le64(old_size);
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mi_b->dirty = true;
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goto again_1;
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}
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if (new_size != old_size ||
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(new_alloc != old_alloc && !keep_prealloc)) {
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/*
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* Truncate clusters. In simple case we have to:
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* - update packed run in 'mi'
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* - update attr->nres.evcn
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* - update attr_b->nres.data_size/attr_b->nres.alloc_size
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* - mark and trim clusters as free (vcn, lcn, len)
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*/
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CLST dlen = 0;
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vcn = max(svcn, new_alen);
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new_alloc_tmp = (u64)vcn << cluster_bits;
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alen = 0;
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err = run_deallocate_ex(sbi, run, vcn, evcn - vcn + 1, &alen,
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true);
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if (err)
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goto out;
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run_truncate(run, vcn);
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if (vcn > svcn) {
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err = mi_pack_runs(mi, attr, run, vcn - svcn);
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if (err)
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@ -697,7 +720,7 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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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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goto bad_inode;
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}
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le = (struct ATTR_LIST_ENTRY *)((u8 *)le - le_sz);
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@ -723,13 +746,21 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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attr_b->nres.valid_size =
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attr_b->nres.alloc_size;
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}
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if (is_ext)
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le64_sub_cpu(&attr_b->nres.total_size,
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((u64)alen << cluster_bits));
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mi_b->dirty = true;
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err = run_deallocate_ex(sbi, run, vcn, evcn - vcn + 1, &dlen,
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true);
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if (err)
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goto out;
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if (is_ext) {
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/* dlen - really deallocated clusters. */
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le64_sub_cpu(&attr_b->nres.total_size,
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((u64)dlen << cluster_bits));
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}
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run_truncate(run, vcn);
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if (new_alloc_tmp <= new_alloc)
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goto ok;
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@ -747,7 +778,7 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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if (le->type != type || le->name_len != name_len ||
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memcmp(le_name(le), name, name_len * sizeof(short))) {
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err = -EINVAL;
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goto out;
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goto bad_inode;
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}
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err = ni_load_mi(ni, le, &mi);
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@ -757,7 +788,7 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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attr = mi_find_attr(mi, NULL, type, name, name_len, &le->id);
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if (!attr) {
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err = -EINVAL;
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goto out;
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goto bad_inode;
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}
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goto next_le_1;
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}
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@ -772,13 +803,13 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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}
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}
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out:
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if (!err && attr_b && ret)
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ok1:
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if (ret)
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*ret = attr_b;
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/* Update inode_set_bytes. */
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if (!err && ((type == ATTR_DATA && !name_len) ||
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(type == ATTR_ALLOC && name == I30_NAME))) {
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if (((type == ATTR_DATA && !name_len) ||
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(type == ATTR_ALLOC && name == I30_NAME))) {
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bool dirty = false;
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if (ni->vfs_inode.i_size != new_size) {
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@ -786,7 +817,7 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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dirty = true;
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}
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if (attr_b && attr_b->non_res) {
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if (attr_b->non_res) {
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new_alloc = le64_to_cpu(attr_b->nres.alloc_size);
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if (inode_get_bytes(&ni->vfs_inode) != new_alloc) {
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inode_set_bytes(&ni->vfs_inode, new_alloc);
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@ -800,6 +831,47 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
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}
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}
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return 0;
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undo_2:
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vcn -= alen;
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attr_b->nres.data_size = cpu_to_le64(old_size);
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attr_b->nres.valid_size = cpu_to_le64(old_valid);
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attr_b->nres.alloc_size = cpu_to_le64(old_alloc);
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/* Restore 'attr' and 'mi'. */
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if (attr)
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goto restore_run;
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if (le64_to_cpu(attr_b->nres.svcn) <= svcn &&
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svcn <= le64_to_cpu(attr_b->nres.evcn)) {
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attr = attr_b;
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le = le_b;
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mi = mi_b;
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} else if (!le_b) {
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err = -EINVAL;
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goto bad_inode;
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} else {
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le = le_b;
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attr = ni_find_attr(ni, attr_b, &le, type, name, name_len,
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&svcn, &mi);
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if (!attr)
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goto bad_inode;
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}
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restore_run:
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if (mi_pack_runs(mi, attr, run, evcn - svcn + 1))
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is_bad = true;
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undo_1:
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run_deallocate_ex(sbi, run, vcn, alen, NULL, false);
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run_truncate(run, vcn);
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out:
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if (is_bad) {
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bad_inode:
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_ntfs_bad_inode(&ni->vfs_inode);
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}
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return err;
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}
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