Merge tag 'ntfs3_for_6.10' of https://github.com/Paragon-Software-Group/linux-ntfs3

Pull ntfs3 updates from Konstantin Komarov:
 "Fixes:
   - reusing of the file index (could cause the file to be trimmed)
   - infinite dir enumeration
   - taking DOS names into account during link counting
   - le32_to_cpu conversion, 32 bit overflow, NULL check
   - some code was refactored

  Changes:
   - removed max link count info display during driver init

  Remove:
   - atomic_open has been removed for lack of use"

* tag 'ntfs3_for_6.10' of https://github.com/Paragon-Software-Group/linux-ntfs3:
  fs/ntfs3: Break dir enumeration if directory contents error
  fs/ntfs3: Fix case when index is reused during tree transformation
  fs/ntfs3: Mark volume as dirty if xattr is broken
  fs/ntfs3: Always make file nonresident on fallocate call
  fs/ntfs3: Redesign ntfs_create_inode to return error code instead of inode
  fs/ntfs3: Use variable length array instead of fixed size
  fs/ntfs3: Use 64 bit variable to avoid 32 bit overflow
  fs/ntfs3: Check 'folio' pointer for NULL
  fs/ntfs3: Missed le32_to_cpu conversion
  fs/ntfs3: Remove max link count info display during driver init
  fs/ntfs3: Taking DOS names into account during link counting
  fs/ntfs3: remove atomic_open
  fs/ntfs3: use kcalloc() instead of kzalloc()

13 files changed, 98 insertions, 154 deletions

diff --git a/fs/ntfs3/attrib.c b/fs/ntfs3/attrib.c
index 7aadf5010999..8e6bcdf99770 100644
--- a/fs/ntfs3/attrib.c
+++ b/fs/ntfs3/attrib.c
@@ -2558,3 +2558,35 @@ undo_insert_range:
 
 	goto out;
 }
+
+/*
+ * attr_force_nonresident
+ *
+ * Convert default data attribute into non resident form.
+ */
+int attr_force_nonresident(struct ntfs_inode *ni)
+{
+	int err;
+	struct ATTRIB *attr;
+	struct ATTR_LIST_ENTRY *le = NULL;
+	struct mft_inode *mi;
+
+	attr = ni_find_attr(ni, NULL, &le, ATTR_DATA, NULL, 0, NULL, &mi);
+	if (!attr) {
+		ntfs_bad_inode(&ni->vfs_inode, "no data attribute");
+		return -ENOENT;
+	}
+
+	if (attr->non_res) {
+		/* Already non resident. */
+		return 0;
+	}
+
+	down_write(&ni->file.run_lock);
+	err = attr_make_nonresident(ni, attr, le, mi,
+				    le32_to_cpu(attr->res.data_size),
+				    &ni->file.run, &attr, NULL);
+	up_write(&ni->file.run_lock);
+
+	return err;
+}
diff --git a/fs/ntfs3/dir.c b/fs/ntfs3/dir.c
index 263635199b60..1937e8e612f8 100644
--- a/fs/ntfs3/dir.c
+++ b/fs/ntfs3/dir.c
@@ -475,6 +475,7 @@ static int ntfs_readdir(struct file *file, struct dir_context *ctx)
 		vbo = (u64)bit << index_bits;
 		if (vbo >= i_size) {
 			ntfs_inode_err(dir, "Looks like your dir is corrupt");
+			ctx->pos = eod;
 			err = -EINVAL;
 			goto out;
 		}
diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
index b73969e05052..2f903b6ce157 100644
--- a/fs/ntfs3/file.c
+++ b/fs/ntfs3/file.c
@@ -578,6 +578,15 @@ static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
 		/* Check new size. */
 		u8 cluster_bits = sbi->cluster_bits;
 
+		/* Be sure file is non resident. */
+		if (is_resident(ni)) {
+			ni_lock(ni);
+			err = attr_force_nonresident(ni);
+			ni_unlock(ni);
+			if (err)
+				goto out;
+		}
+
 		/* generic/213: expected -ENOSPC instead of -EFBIG. */
 		if (!is_supported_holes) {
 			loff_t to_alloc = new_size - inode_get_bytes(inode);
diff --git a/fs/ntfs3/frecord.c b/fs/ntfs3/frecord.c
index 7f27382e0ce2..0008670939a4 100644
--- a/fs/ntfs3/frecord.c
+++ b/fs/ntfs3/frecord.c
@@ -2636,7 +2636,7 @@ int ni_read_frame(struct ntfs_inode *ni, u64 frame_vbo, struct page **pages,
 		goto out1;
 	}
 
-	pages_disk = kzalloc(npages_disk * sizeof(struct page *), GFP_NOFS);
+	pages_disk = kcalloc(npages_disk, sizeof(*pages_disk), GFP_NOFS);
 	if (!pages_disk) {
 		err = -ENOMEM;
 		goto out2;
diff --git a/fs/ntfs3/fslog.c b/fs/ntfs3/fslog.c
index 855519713bf7..d7807d255dfe 100644
--- a/fs/ntfs3/fslog.c
+++ b/fs/ntfs3/fslog.c
@@ -517,7 +517,7 @@ static inline bool is_rst_area_valid(const struct RESTART_HDR *rhdr)
 		seq_bits -= 1;
 	}
 
-	if (seq_bits != ra->seq_num_bits)
+	if (seq_bits != le32_to_cpu(ra->seq_num_bits))
 		return false;
 
 	/* The log page data offset and record header length must be quad-aligned. */
@@ -1184,7 +1184,8 @@ out:
 static int log_read_rst(struct ntfs_log *log, bool first,
 			struct restart_info *info)
 {
-	u32 skip, vbo;
+	u32 skip;
+	u64 vbo;
 	struct RESTART_HDR *r_page = NULL;
 
 	/* Determine which restart area we are looking for. */
diff --git a/fs/ntfs3/index.c b/fs/ntfs3/index.c
index 43796aaa3d97..d0f15bbf78f6 100644
--- a/fs/ntfs3/index.c
+++ b/fs/ntfs3/index.c
@@ -1534,6 +1534,11 @@ static int indx_add_allocate(struct ntfs_index *indx, struct ntfs_inode *ni,
 		goto out1;
 	}
 
+	if (data_size <= le64_to_cpu(alloc->nres.data_size)) {
+		/* Reuse index. */
+		goto out;
+	}
+
 	/* Increase allocation. */
 	err = attr_set_size(ni, ATTR_ALLOC, in->name, in->name_len,
 			    &indx->alloc_run, data_size, &data_size, true,
@@ -1547,6 +1552,7 @@ static int indx_add_allocate(struct ntfs_index *indx, struct ntfs_inode *ni,
 	if (in->name == I30_NAME)
 		i_size_write(&ni->vfs_inode, data_size);
 
+out:
 	*vbn = bit << indx->idx2vbn_bits;
 
 	return 0;
diff --git a/fs/ntfs3/inode.c b/fs/ntfs3/inode.c
index d273eda1cf45..0f1664db94ad 100644
--- a/fs/ntfs3/inode.c
+++ b/fs/ntfs3/inode.c
@@ -37,7 +37,7 @@ static struct inode *ntfs_read_mft(struct inode *inode,
 	bool is_dir;
 	unsigned long ino = inode->i_ino;
 	u32 rp_fa = 0, asize, t32;
-	u16 roff, rsize, names = 0;
+	u16 roff, rsize, names = 0, links = 0;
 	const struct ATTR_FILE_NAME *fname = NULL;
 	const struct INDEX_ROOT *root;
 	struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
@@ -200,11 +200,12 @@ next_attr:
 		    rsize < SIZEOF_ATTRIBUTE_FILENAME)
 			goto out;
 
+		names += 1;
 		fname = Add2Ptr(attr, roff);
 		if (fname->type == FILE_NAME_DOS)
 			goto next_attr;
 
-		names += 1;
+		links += 1;
 		if (name && name->len == fname->name_len &&
 		    !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
 					NULL, false))
@@ -429,7 +430,7 @@ end_enum:
 		ni->mi.dirty = true;
 	}
 
-	set_nlink(inode, names);
+	set_nlink(inode, links);
 
 	if (S_ISDIR(mode)) {
 		ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
@@ -576,13 +577,18 @@ static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
 	clear_buffer_uptodate(bh);
 
 	if (is_resident(ni)) {
-		ni_lock(ni);
-		err = attr_data_read_resident(ni, &folio->page);
-		ni_unlock(ni);
-
-		if (!err)
-			set_buffer_uptodate(bh);
+		bh->b_blocknr = RESIDENT_LCN;
 		bh->b_size = block_size;
+		if (!folio) {
+			err = 0;
+		} else {
+			ni_lock(ni);
+			err = attr_data_read_resident(ni, &folio->page);
+			ni_unlock(ni);
+
+			if (!err)
+				set_buffer_uptodate(bh);
+		}
 		return err;
 	}
 
@@ -1216,11 +1222,10 @@ out:
  *
  * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
  */
-struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
-				struct dentry *dentry,
-				const struct cpu_str *uni, umode_t mode,
-				dev_t dev, const char *symname, u32 size,
-				struct ntfs_fnd *fnd)
+int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
+		      struct dentry *dentry, const struct cpu_str *uni,
+		      umode_t mode, dev_t dev, const char *symname, u32 size,
+		      struct ntfs_fnd *fnd)
 {
 	int err;
 	struct super_block *sb = dir->i_sb;
@@ -1245,6 +1250,9 @@ struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
 	struct REPARSE_DATA_BUFFER *rp = NULL;
 	bool rp_inserted = false;
 
+	/* New file will be resident or non resident. */
+	const bool new_file_resident = 1;
+
 	if (!fnd)
 		ni_lock_dir(dir_ni);
 
@@ -1484,7 +1492,7 @@ struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
 		attr->size = cpu_to_le32(SIZEOF_RESIDENT);
 		attr->name_off = SIZEOF_RESIDENT_LE;
 		attr->res.data_off = SIZEOF_RESIDENT_LE;
-	} else if (S_ISREG(mode)) {
+	} else if (!new_file_resident && S_ISREG(mode)) {
 		/*
 		 * Regular file. Create empty non resident data attribute.
 		 */
@@ -1727,12 +1735,10 @@ out1:
 	if (!fnd)
 		ni_unlock(dir_ni);
 
-	if (err)
-		return ERR_PTR(err);
-
-	unlock_new_inode(inode);
+	if (!err)
+		unlock_new_inode(inode);
 
-	return inode;
+	return err;
 }
 
 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
diff --git a/fs/ntfs3/namei.c b/fs/ntfs3/namei.c
index 084d19d78397..71498421ce60 100644
--- a/fs/ntfs3/namei.c
+++ b/fs/ntfs3/namei.c
@@ -107,12 +107,8 @@ static struct dentry *ntfs_lookup(struct inode *dir, struct dentry *dentry,
 static int ntfs_create(struct mnt_idmap *idmap, struct inode *dir,
 		       struct dentry *dentry, umode_t mode, bool excl)
 {
-	struct inode *inode;
-
-	inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFREG | mode, 0,
-				  NULL, 0, NULL);
-
-	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
+	return ntfs_create_inode(idmap, dir, dentry, NULL, S_IFREG | mode, 0,
+				 NULL, 0, NULL);
 }
 
 /*
@@ -123,12 +119,8 @@ static int ntfs_create(struct mnt_idmap *idmap, struct inode *dir,
 static int ntfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
 		      struct dentry *dentry, umode_t mode, dev_t rdev)
 {
-	struct inode *inode;
-
-	inode = ntfs_create_inode(idmap, dir, dentry, NULL, mode, rdev, NULL, 0,
-				  NULL);
-
-	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
+	return ntfs_create_inode(idmap, dir, dentry, NULL, mode, rdev, NULL, 0,
+				 NULL);
 }
 
 /*
@@ -200,15 +192,12 @@ static int ntfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
 			struct dentry *dentry, const char *symname)
 {
 	u32 size = strlen(symname);
-	struct inode *inode;
 
 	if (unlikely(ntfs3_forced_shutdown(dir->i_sb)))
 		return -EIO;
 
-	inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFLNK | 0777, 0,
-				  symname, size, NULL);
-
-	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
+	return ntfs_create_inode(idmap, dir, dentry, NULL, S_IFLNK | 0777, 0,
+				 symname, size, NULL);
 }
 
 /*
@@ -217,12 +206,8 @@ static int ntfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
 static int ntfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 		      struct dentry *dentry, umode_t mode)
 {
-	struct inode *inode;
-
-	inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFDIR | mode, 0,
-				  NULL, 0, NULL);
-
-	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
+	return ntfs_create_inode(idmap, dir, dentry, NULL, S_IFDIR | mode, 0,
+				 NULL, 0, NULL);
 }
 
 /*
@@ -358,95 +343,6 @@ out:
 	return err;
 }
 
-/*
- * ntfs_atomic_open
- *
- * inode_operations::atomic_open
- */
-static int ntfs_atomic_open(struct inode *dir, struct dentry *dentry,
-			    struct file *file, u32 flags, umode_t mode)
-{
-	int err;
-	struct inode *inode;
-	struct ntfs_fnd *fnd = NULL;
-	struct ntfs_inode *ni = ntfs_i(dir);
-	struct dentry *d = NULL;
-	struct cpu_str *uni = __getname();
-	bool locked = false;
-
-	if (!uni)
-		return -ENOMEM;
-
-	err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name,
-				dentry->d_name.len, uni, NTFS_NAME_LEN,
-				UTF16_HOST_ENDIAN);
-	if (err < 0)
-		goto out;
-
-#ifdef CONFIG_NTFS3_FS_POSIX_ACL
-	if (IS_POSIXACL(dir)) {
-		/*
-		 * Load in cache current acl to avoid ni_lock(dir):
-		 * ntfs_create_inode -> ntfs_init_acl -> posix_acl_create ->
-		 * ntfs_get_acl -> ntfs_get_acl_ex -> ni_lock
-		 */
-		struct posix_acl *p = get_inode_acl(dir, ACL_TYPE_DEFAULT);
-
-		if (IS_ERR(p)) {
-			err = PTR_ERR(p);
-			goto out;
-		}
-		posix_acl_release(p);
-	}
-#endif
-
-	if (d_in_lookup(dentry)) {
-		ni_lock_dir(ni);
-		locked = true;
-		fnd = fnd_get();
-		if (!fnd) {
-			err = -ENOMEM;
-			goto out1;
-		}
-
-		d = d_splice_alias(dir_search_u(dir, uni, fnd), dentry);
-		if (IS_ERR(d)) {
-			err = PTR_ERR(d);
-			d = NULL;
-			goto out2;
-		}
-
-		if (d)
-			dentry = d;
-	}
-
-	if (!(flags & O_CREAT) || d_really_is_positive(dentry)) {
-		err = finish_no_open(file, d);
-		goto out2;
-	}
-
-	file->f_mode |= FMODE_CREATED;
-
-	/*
-	 * fnd contains tree's path to insert to.
-	 * If fnd is not NULL then dir is locked.
-	 */
-	inode = ntfs_create_inode(file_mnt_idmap(file), dir, dentry, uni,
-				  mode, 0, NULL, 0, fnd);
-	err = IS_ERR(inode) ? PTR_ERR(inode) :
-			      finish_open(file, dentry, ntfs_file_open);
-	dput(d);
-
-out2:
-	fnd_put(fnd);
-out1:
-	if (locked)
-		ni_unlock(ni);
-out:
-	__putname(uni);
-	return err;
-}
-
 struct dentry *ntfs3_get_parent(struct dentry *child)
 {
 	struct inode *inode = d_inode(child);
@@ -612,7 +508,6 @@ const struct inode_operations ntfs_dir_inode_operations = {
 	.setattr	= ntfs3_setattr,
 	.getattr	= ntfs_getattr,
 	.listxattr	= ntfs_listxattr,
-	.atomic_open	= ntfs_atomic_open,
 	.fiemap		= ntfs_fiemap,
 };
 
diff --git a/fs/ntfs3/ntfs.h b/fs/ntfs3/ntfs.h
index 9c7478150a03..3d6143c7abc0 100644
--- a/fs/ntfs3/ntfs.h
+++ b/fs/ntfs3/ntfs.h
@@ -59,7 +59,7 @@ struct GUID {
 struct cpu_str {
 	u8 len;
 	u8 unused;
-	u16 name[10];
+	u16 name[];
 };
 
 struct le_str {
diff --git a/fs/ntfs3/ntfs_fs.h b/fs/ntfs3/ntfs_fs.h
index c018fad4c037..f9ed6d2b065d 100644
--- a/fs/ntfs3/ntfs_fs.h
+++ b/fs/ntfs3/ntfs_fs.h
@@ -452,6 +452,7 @@ int attr_allocate_frame(struct ntfs_inode *ni, CLST frame, size_t compr_size,
 int attr_collapse_range(struct ntfs_inode *ni, u64 vbo, u64 bytes);
 int attr_insert_range(struct ntfs_inode *ni, u64 vbo, u64 bytes);
 int attr_punch_hole(struct ntfs_inode *ni, u64 vbo, u64 bytes, u32 *frame_size);
+int attr_force_nonresident(struct ntfs_inode *ni);
 
 /* Functions from attrlist.c */
 void al_destroy(struct ntfs_inode *ni);
@@ -716,11 +717,10 @@ int ntfs_sync_inode(struct inode *inode);
 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
 		      struct inode *i2);
 int inode_write_data(struct inode *inode, const void *data, size_t bytes);
-struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
-				struct dentry *dentry,
-				const struct cpu_str *uni, umode_t mode,
-				dev_t dev, const char *symname, u32 size,
-				struct ntfs_fnd *fnd);
+int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
+		      struct dentry *dentry, const struct cpu_str *uni,
+		      umode_t mode, dev_t dev, const char *symname, u32 size,
+		      struct ntfs_fnd *fnd);
 int ntfs_link_inode(struct inode *inode, struct dentry *dentry);
 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry);
 void ntfs_evict_inode(struct inode *inode);
diff --git a/fs/ntfs3/record.c b/fs/ntfs3/record.c
index 6aa3a9d44df1..6c76503edc20 100644
--- a/fs/ntfs3/record.c
+++ b/fs/ntfs3/record.c
@@ -534,16 +534,9 @@ bool mi_remove_attr(struct ntfs_inode *ni, struct mft_inode *mi,
 	if (aoff + asize > used)
 		return false;
 
-	if (ni && is_attr_indexed(attr)) {
+	if (ni && is_attr_indexed(attr) && attr->type == ATTR_NAME) {
 		u16 links = le16_to_cpu(ni->mi.mrec->hard_links);
-		struct ATTR_FILE_NAME *fname =
-			attr->type != ATTR_NAME ?
-				NULL :
-				resident_data_ex(attr,
-						 SIZEOF_ATTRIBUTE_FILENAME);
-		if (fname && fname->type == FILE_NAME_DOS) {
-			/* Do not decrease links count deleting DOS name. */
-		} else if (!links) {
+		if (!links) {
 			/* minor error. Not critical. */
 		} else {
 			ni->mi.mrec->hard_links = cpu_to_le16(links - 1);
diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index f41e01c5676a..27fbde2701b6 100644
--- a/fs/ntfs3/super.c
+++ b/fs/ntfs3/super.c
@@ -1861,8 +1861,6 @@ static int __init init_ntfs_fs(void)
 {
 	int err;
 
-	pr_info("ntfs3: Max link count %u\n", NTFS_LINK_MAX);
-
 	if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL))
 		pr_info("ntfs3: Enabled Linux POSIX ACLs support\n");
 	if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER))
diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c
index 53e7d1fa036a..73785dece7a7 100644
--- a/fs/ntfs3/xattr.c
+++ b/fs/ntfs3/xattr.c
@@ -219,8 +219,11 @@ static ssize_t ntfs_list_ea(struct ntfs_inode *ni, char *buffer,
 		if (!ea->name_len)
 			break;
 
-		if (ea->name_len > ea_size)
+		if (ea->name_len > ea_size) {
+			ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_ERROR);
+			err = -EINVAL; /* corrupted fs */
 			break;
+		}
 
 		if (buffer) {
 			/* Check if we can use field ea->name */