Merge tag 'ntfs3_for_6.12' of https://github.com/Paragon-Software-Group/linux-ntfs3

Pull ntfs3 updates from Konstantin Komarov:
"New:
   - implement fallocate for compressed files
   - add support for the compression attribute
   - optimize large writes to sparse files

 Fixes:
   - fix several potential deadlock scenarios
   - fix various internal bugs detected by syzbot
   - add checks before accessing NTFS structures during parsing
   - correct the format of output messages

  Refactoring:
   - replace fsparam_flag_no with fsparam_flag in options parser
   - remove unused functions and macros"

* tag 'ntfs3_for_6.12' of https://github.com/Paragon-Software-Group/linux-ntfs3: (25 commits)
  fs/ntfs3: Format output messages like others fs in kernel
  fs/ntfs3: Additional check in ntfs_file_release
  fs/ntfs3: Fix general protection fault in run_is_mapped_full
  fs/ntfs3: Sequential field availability check in mi_enum_attr()
  fs/ntfs3: Additional check in ni_clear()
  fs/ntfs3: Fix possible deadlock in mi_read
  ntfs3: Change to non-blocking allocation in ntfs_d_hash
  fs/ntfs3: Remove unused al_delete_le
  fs/ntfs3: Rename ntfs3_setattr into ntfs_setattr
  fs/ntfs3: Replace fsparam_flag_no -> fsparam_flag
  fs/ntfs3: Add support for the compression attribute
  fs/ntfs3: Implement fallocate for compressed files
  fs/ntfs3: Make checks in run_unpack more clear
  fs/ntfs3: Add rough attr alloc_size check
  fs/ntfs3: Stale inode instead of bad
  fs/ntfs3: Refactor enum_rstbl to suppress static checker
  fs/ntfs3: Fix sparse warning in ni_fiemap
  fs/ntfs3: Fix warning possible deadlock in ntfs_set_state
  fs/ntfs3: Fix sparse warning for bigendian
  fs/ntfs3: Separete common code for file_read/write iter/splice
  ...

Author: torvalds

fs/ntfs3/attrib.c

@@ -976,15 +976,17 @@ int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn,
 		goto out;
 
 	/* Check for compressed frame. */
-	err = attr_is_frame_compressed(ni, attr, vcn >> NTFS_LZNT_CUNIT, &hint);
+	err = attr_is_frame_compressed(ni, attr_b, vcn >> NTFS_LZNT_CUNIT,
+				       &hint);
 	if (err)
 		goto out;
 
 	if (hint) {
 		/* if frame is compressed - don't touch it. */
 		*lcn = COMPRESSED_LCN;
-		*len = hint;
-		err = -EOPNOTSUPP;
+		/* length to the end of frame. */
+		*len = NTFS_LZNT_CLUSTERS - (vcn & (NTFS_LZNT_CLUSTERS - 1));
+		err = 0;
 		goto out;
 	}
 
@@ -1027,16 +1029,16 @@ int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn,
 
 		/* Check if 'vcn' and 'vcn0' in different attribute segments. */
 		if (vcn < svcn || evcn1 <= vcn) {
-			/* Load attribute for truncated vcn. */
-			attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0,
-					    &vcn, &mi);
-			if (!attr) {
+			struct ATTRIB *attr2;
+			/* Load runs for truncated vcn. */
+			attr2 = ni_find_attr(ni, attr_b, &le_b, ATTR_DATA, NULL,
+					     0, &vcn, &mi);
+			if (!attr2) {
 				err = -EINVAL;
 				goto out;
 			}
-			svcn = le64_to_cpu(attr->nres.svcn);
-			evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
-			err = attr_load_runs(attr, ni, run, NULL);
+			evcn1 = le64_to_cpu(attr2->nres.evcn) + 1;
+			err = attr_load_runs(attr2, ni, run, NULL);
 			if (err)
 				goto out;
 		}
@@ -1517,6 +1519,9 @@ int attr_wof_frame_info(struct ntfs_inode *ni, struct ATTRIB *attr,
 
 /*
  * attr_is_frame_compressed - Used to detect compressed frame.
+ *
+ * attr - base (primary) attribute segment.
+ * Only base segments contains valid 'attr->nres.c_unit'
  */
 int attr_is_frame_compressed(struct ntfs_inode *ni, struct ATTRIB *attr,
 			     CLST frame, CLST *clst_data)
@@ -2600,3 +2605,74 @@ int attr_force_nonresident(struct ntfs_inode *ni)
 
 	return err;
 }
+
+/*
+ * Change the compression of data attribute
+ */
+int attr_set_compress(struct ntfs_inode *ni, bool compr)
+{
+	struct ATTRIB *attr;
+	struct mft_inode *mi;
+
+	attr = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0, NULL, &mi);
+	if (!attr)
+		return -ENOENT;
+
+	if (is_attr_compressed(attr) == !!compr) {
+		/* Already required compressed state. */
+		return 0;
+	}
+
+	if (attr->non_res) {
+		u16 run_off;
+		u32 run_size;
+		char *run;
+
+		if (attr->nres.data_size) {
+			/*
+			 * There are rare cases when it possible to change
+			 * compress state without big changes.
+			 * TODO: Process these cases.
+			 */
+			return -EOPNOTSUPP;
+		}
+
+		run_off = le16_to_cpu(attr->nres.run_off);
+		run_size = le32_to_cpu(attr->size) - run_off;
+		run = Add2Ptr(attr, run_off);
+
+		if (!compr) {
+			/* remove field 'attr->nres.total_size'. */
+			memmove(run - 8, run, run_size);
+			run_off -= 8;
+		}
+
+		if (!mi_resize_attr(mi, attr, compr ? +8 : -8)) {
+			/*
+			 * Ignore rare case when there are no 8 bytes in record with attr.
+			 * TODO: split attribute.
+			 */
+			return -EOPNOTSUPP;
+		}
+
+		if (compr) {
+			/* Make a gap for 'attr->nres.total_size'. */
+			memmove(run + 8, run, run_size);
+			run_off += 8;
+			attr->nres.total_size = attr->nres.alloc_size;
+		}
+		attr->nres.run_off = cpu_to_le16(run_off);
+	}
+
+	/* Update data attribute flags. */
+	if (compr) {
+		attr->flags |= ATTR_FLAG_COMPRESSED;
+		attr->nres.c_unit = NTFS_LZNT_CUNIT;
+	} else {
+		attr->flags &= ~ATTR_FLAG_COMPRESSED;
+		attr->nres.c_unit = 0;
+	}
+	mi->dirty = true;
+
+	return 0;
+}

fs/ntfs3/attrlist.c

@@ -382,59 +382,6 @@ bool al_remove_le(struct ntfs_inode *ni, struct ATTR_LIST_ENTRY *le)
 	return true;
 }
 
-/*
- * al_delete_le - Delete first le from the list which matches its parameters.
- */
-bool al_delete_le(struct ntfs_inode *ni, enum ATTR_TYPE type, CLST vcn,
-		  const __le16 *name, u8 name_len, const struct MFT_REF *ref)
-{
-	u16 size;
-	struct ATTR_LIST_ENTRY *le;
-	size_t off;
-	typeof(ni->attr_list) *al = &ni->attr_list;
-
-	/* Scan forward to the first le that matches the input. */
-	le = al_find_ex(ni, NULL, type, name, name_len, &vcn);
-	if (!le)
-		return false;
-
-	off = PtrOffset(al->le, le);
-
-next:
-	if (off >= al->size)
-		return false;
-	if (le->type != type)
-		return false;
-	if (le->name_len != name_len)
-		return false;
-	if (name_len && ntfs_cmp_names(le_name(le), name_len, name, name_len,
-				       ni->mi.sbi->upcase, true))
-		return false;
-	if (le64_to_cpu(le->vcn) != vcn)
-		return false;
-
-	/*
-	 * The caller specified a segment reference, so we have to
-	 * scan through the matching entries until we find that segment
-	 * reference or we run of matching entries.
-	 */
-	if (ref && memcmp(ref, &le->ref, sizeof(*ref))) {
-		off += le16_to_cpu(le->size);
-		le = Add2Ptr(al->le, off);
-		goto next;
-	}
-
-	/* Save on stack the size of 'le'. */
-	size = le16_to_cpu(le->size);
-	/* Delete the le. */
-	memmove(le, Add2Ptr(le, size), al->size - (off + size));
-
-	al->size -= size;
-	al->dirty = true;
-
-	return true;
-}
-
 int al_update(struct ntfs_inode *ni, int sync)
 {
 	int err;