[PATCH v9 14/17] ntfs3: remove legacy ntfs driver support

Namjae Jeon
2026-02-13T08:37:03Z

Reverts the following commits that introduced legacy ntfs
driver alias and related support code:

74871791ffa9 ntfs3: serve as alias for the legacy ntfs driver
1ff2e956608c fs/ntfs3: Redesign legacy ntfs support
9b872cc50daa ntfs3: add legacy ntfs file operations
d55f90e9b243 ntfs3: enforce read-only when used as legacy ntfs driver

The legacy ntfs driver has been remade as a new implementation, so the
alias and related codes in ntfs3 are no longer needed.

Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
fs/ntfs3/Kconfig | 9 -------
fs/ntfs3/dir.c | 10 --------
fs/ntfs3/file.c | 11 ---------
fs/ntfs3/inode.c | 16 ++++---------
fs/ntfs3/ntfs_fs.h | 11 ---------
fs/ntfs3/super.c | 59 +---------------------------------------------
6 files changed, 5 insertions(+), 111 deletions(-)

diff --git a/fs/ntfs3/Kconfig b/fs/ntfs3/Kconfig
index 7bc31d69f680..cdfdf51e55d7 100644
--- a/fs/ntfs3/Kconfig
+++ b/fs/ntfs3/Kconfig
@@ -46,12 +46,3 @@ config NTFS3_FS_POSIX_ACL
NOTE: this is linux only feature. Windows will ignore these ACLs.

If you don't know what Access Control Lists are, say N.
-
-config NTFS_FS
- tristate "NTFS file system support"
- select NTFS3_FS
- select BUFFER_HEAD
- select NLS
- help
- This config option is here only for backward compatibility. NTFS
- filesystem is now handled by the NTFS3 driver.
diff --git a/fs/ntfs3/dir.c b/fs/ntfs3/dir.c
index 596f8c62f033..3eab8609bb6f 100644
--- a/fs/ntfs3/dir.c
+++ b/fs/ntfs3/dir.c
@@ -632,14 +632,4 @@ const struct file_operations ntfs_dir_operations = {
#endif
.setlease = generic_setlease,
};
-
-#if IS_ENABLED(CONFIG_NTFS_FS)
-const struct file_operations ntfs_legacy_dir_operations = {
- .llseek = generic_file_llseek,
- .read = generic_read_dir,
- .iterate_shared = ntfs_readdir,
- .open = ntfs_file_open,
- .setlease = generic_setlease,
-};
-#endif
// clang-format on
diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
index 6cb4479072a6..cc8cfbb6e1d6 100644
--- a/fs/ntfs3/file.c
+++ b/fs/ntfs3/file.c
@@ -1480,15 +1480,4 @@ const struct file_operations ntfs_file_operations = {
.release = ntfs_file_release,
.setlease = generic_setlease,
};
-
-#if IS_ENABLED(CONFIG_NTFS_FS)
-const struct file_operations ntfs_legacy_file_operations = {
- .llseek = generic_file_llseek,
- .read_iter = ntfs_file_read_iter,
- .splice_read = ntfs_file_splice_read,
- .open = ntfs_file_open,
- .release = ntfs_file_release,
- .setlease = generic_setlease,
-};
-#endif
// clang-format on
diff --git a/fs/ntfs3/inode.c b/fs/ntfs3/inode.c
index edfb973e4e82..de1d6eaf179d 100644
--- a/fs/ntfs3/inode.c
+++ b/fs/ntfs3/inode.c
@@ -444,9 +444,7 @@ static struct inode *ntfs_read_mft(struct inode *inode,
* Usually a hard links to directories are disabled.
*/
inode->i_op = &ntfs_dir_inode_operations;
- inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
- &ntfs_legacy_dir_operations :
- &ntfs_dir_operations;
+ inode->i_fop = &ntfs_dir_operations;
ni->i_valid = 0;
} else if (S_ISLNK(mode)) {
ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
@@ -456,9 +454,7 @@ static struct inode *ntfs_read_mft(struct inode *inode,
} else if (S_ISREG(mode)) {
ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
inode->i_op = &ntfs_file_inode_operations;
- inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
- &ntfs_legacy_file_operations :
- &ntfs_file_operations;
+ inode->i_fop = &ntfs_file_operations;
inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
&ntfs_aops;
if (ino != MFT_REC_MFT)
@@ -1590,9 +1586,7 @@ int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,

if (S_ISDIR(mode)) {
inode->i_op = &ntfs_dir_inode_operations;
- inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
- &ntfs_legacy_dir_operations :
- &ntfs_dir_operations;
+ inode->i_fop = &ntfs_dir_operations;
} else if (S_ISLNK(mode)) {
inode->i_op = &ntfs_link_inode_operations;
inode->i_fop = NULL;
@@ -1601,9 +1595,7 @@ int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
inode_nohighmem(inode);
} else if (S_ISREG(mode)) {
inode->i_op = &ntfs_file_inode_operations;
- inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
- &ntfs_legacy_file_operations :
- &ntfs_file_operations;
+ inode->i_fop = &ntfs_file_operations;
inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
&ntfs_aops;
init_rwsem(&ni->file.run_lock);
diff --git a/fs/ntfs3/ntfs_fs.h b/fs/ntfs3/ntfs_fs.h
index f18349689458..93bec795b18a 100644
--- a/fs/ntfs3/ntfs_fs.h
+++ b/fs/ntfs3/ntfs_fs.h
@@ -502,7 +502,6 @@ struct inode *dir_search_u(struct inode *dir, const struct cpu_str *uni,
struct ntfs_fnd *fnd);
bool dir_is_empty(struct inode *dir);
extern const struct file_operations ntfs_dir_operations;
-extern const struct file_operations ntfs_legacy_dir_operations;

/* Globals from file.c */
int ntfs_getattr(struct mnt_idmap *idmap, const struct path *path,
@@ -517,7 +516,6 @@ long ntfs_compat_ioctl(struct file *filp, u32 cmd, unsigned long arg);
extern const struct inode_operations ntfs_special_inode_operations;
extern const struct inode_operations ntfs_file_inode_operations;
extern const struct file_operations ntfs_file_operations;
-extern const struct file_operations ntfs_legacy_file_operations;

/* Globals from frecord.c */
void ni_remove_mi(struct ntfs_inode *ni, struct mft_inode *mi);
@@ -1161,13 +1159,4 @@ static inline void le64_sub_cpu(__le64 *var, u64 val)
*var = cpu_to_le64(le64_to_cpu(*var) - val);
}

-#if IS_ENABLED(CONFIG_NTFS_FS)
-bool is_legacy_ntfs(struct super_block *sb);
-#else
-static inline bool is_legacy_ntfs(struct super_block *sb)
-{
- return false;
-}
-#endif
-
#endif /* _LINUX_NTFS3_NTFS_FS_H */
diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index 8b0cf0ed4f72..4e0448af3e7e 100644
--- a/fs/ntfs3/super.c
+++ b/fs/ntfs3/super.c
@@ -415,12 +415,6 @@ static int ntfs_fs_reconfigure(struct fs_context *fc)
struct ntfs_mount_options *new_opts = fc->fs_private;
int ro_rw;

- /* If ntfs3 is used as legacy ntfs enforce read-only mode. */
- if (is_legacy_ntfs(sb)) {
- fc->sb_flags |= SB_RDONLY;
- goto out;
- }
-
ro_rw = sb_rdonly(sb) && !(fc->sb_flags & SB_RDONLY);
if (ro_rw && (sbi->flags & NTFS_FLAGS_NEED_REPLAY)) {
errorf(fc,
@@ -447,7 +441,6 @@ static int ntfs_fs_reconfigure(struct fs_context *fc)
return -EINVAL;
}

-out:
sync_filesystem(sb);
swap(sbi->options, fc->fs_private);

@@ -1670,8 +1663,6 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)

ntfs_create_procdir(sb);

- if (is_legacy_ntfs(sb))
- sb->s_flags |= SB_RDONLY;
return 0;

put_inode_out:
@@ -1796,7 +1787,7 @@ static const struct fs_context_operations ntfs_context_ops = {
* This will called when mount/remount. We will first initialize
* options so that if remount we can use just that.
*/
-static int __ntfs_init_fs_context(struct fs_context *fc)
+static int ntfs_init_fs_context(struct fs_context *fc)
{
struct ntfs_mount_options *opts;
struct ntfs_sb_info *sbi;
@@ -1850,11 +1841,6 @@ static int __ntfs_init_fs_context(struct fs_context *fc)
return -ENOMEM;
}

-static int ntfs_init_fs_context(struct fs_context *fc)
-{
- return __ntfs_init_fs_context(fc);
-}
-
static void ntfs3_kill_sb(struct super_block *sb)
{
struct ntfs_sb_info *sbi = sb->s_fs_info;
@@ -1876,47 +1862,6 @@ static struct file_system_type ntfs_fs_type = {
.fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
};

-#if IS_ENABLED(CONFIG_NTFS_FS)
-static int ntfs_legacy_init_fs_context(struct fs_context *fc)
-{
- int ret;
-
- ret = __ntfs_init_fs_context(fc);
- /* If ntfs3 is used as legacy ntfs enforce read-only mode. */
- fc->sb_flags |= SB_RDONLY;
- return ret;
-}
-
-static struct file_system_type ntfs_legacy_fs_type = {
- .owner = THIS_MODULE,
- .name = "ntfs",
- .init_fs_context = ntfs_legacy_init_fs_context,
- .parameters = ntfs_fs_parameters,
- .kill_sb = ntfs3_kill_sb,
- .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
-};
-MODULE_ALIAS_FS("ntfs");
-
-static inline void register_as_ntfs_legacy(void)
-{
- int err = register_filesystem(&ntfs_legacy_fs_type);
- if (err)
- pr_warn("ntfs3: Failed to register legacy ntfs filesystem driver: %d\n", err);
-}
-
-static inline void unregister_as_ntfs_legacy(void)
-{
- unregister_filesystem(&ntfs_legacy_fs_type);
-}
-bool is_legacy_ntfs(struct super_block *sb)
-{
- return sb->s_type == &ntfs_legacy_fs_type;
-}
-#else
-static inline void register_as_ntfs_legacy(void) {}
-static inline void unregister_as_ntfs_legacy(void) {}
-#endif
-
// clang-format on

static int __init init_ntfs_fs(void)
@@ -1945,7 +1890,6 @@ static int __init init_ntfs_fs(void)
goto out1;
}

- register_as_ntfs_legacy();
err = register_filesystem(&ntfs_fs_type);
if (err)
goto out;
@@ -1965,7 +1909,6 @@ static void __exit exit_ntfs_fs(void)
rcu_barrier();
kmem_cache_destroy(ntfs_inode_cachep);
unregister_filesystem(&ntfs_fs_type);
- unregister_as_ntfs_legacy();
ntfs3_exit_bitmap();
ntfs_remove_proc_root();
}
--
2.25.1