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smb/server: implement FSCTL_SET_COMPRESSION ioctl handler

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Example:

  1. client: smbinfo setcompression no /mnt/file
  2. client: smbinfo getcompression /mnt/file
             Compression: 0 (NONE)
  3. client: smbinfo setcompression lznt1 /mnt/file
  4. client: smbinfo getcompression /mnt/file
             Compression: 2 (LZNT1)
  5. client: smbinfo setcompression default /mnt/file
  6. client: smbinfo getcompression /mnt/file
             Compression: 2 (LZNT1)

Signed-off-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
ChenXiaoSong 2026-06-08 14:01:26 +00:00 committed by Steve French
parent c91f4543dd
commit 7eeb7b6772
4 changed files with 100 additions and 1 deletions
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2
fs/smb/common/smbfsctl.h
View File

@ -62,7 +62,7 @@
#define FSCTL_UNLOCK_VOLUME 0x0009001C
#define FSCTL_IS_PATHNAME_VALID 0x0009002C /* BB add struct */
#define FSCTL_GET_COMPRESSION 0x0009003C
#define FSCTL_SET_COMPRESSION 0x0009C040 /* BB add struct */
#define FSCTL_SET_COMPRESSION 0x0009C040
#define FSCTL_QUERY_FAT_BPB 0x00090058 /* BB add struct */
/* Verify the next FSCTL number, we had it as 0x00090090 before */
#define FSCTL_FILESYSTEM_GET_STATS 0x00090060 /* BB add struct */

28
fs/smb/server/smb2pdu.c
View File

@ -8382,6 +8382,34 @@ int smb2_ioctl(struct ksmbd_work *work)
rsp->VolatileFileId = req->VolatileFileId;
break;
}
case FSCTL_SET_COMPRESSION: {
struct compress_ioctl *cmpr_req;
struct ksmbd_file *fp;
if (in_buf_len < sizeof(struct compress_ioctl)) {
ret = -EINVAL;
goto out;
}
if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
ksmbd_debug(SMB, "User does not have write permission\n");
ret = -EACCES;
goto out;
}
cmpr_req = (struct compress_ioctl *)buffer;
fp = ksmbd_lookup_fd_fast(work, id);
if (!fp) {
ret = -ENOENT;
goto out;
}
ret = ksmbd_vfs_set_compression(work, fp, le16_to_cpu(cmpr_req->CompressionState));
ksmbd_fd_put(work, fp);
if (ret)
goto out;
break;
}
case FSCTL_CREATE_OR_GET_OBJECT_ID:
{
struct file_object_buf_type1_ioctl_rsp *obj_buf;

70
fs/smb/server/vfs.c
View File

@ -1922,3 +1922,73 @@ int ksmbd_vfs_get_compression(struct ksmbd_file *fp, u16 *fmt)
out:
return rc;
}
int ksmbd_vfs_set_compression(struct ksmbd_work *work, struct ksmbd_file *fp, u16 fmt)
{
struct file_kattr fa;
struct dentry *dentry = fp->filp->f_path.dentry;
struct mnt_idmap *idmap = file_mnt_idmap(fp->filp);
u32 flags;
__le32 old_fattr;
int rc;
if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
rc = -EACCES;
goto out;
}
rc = vfs_fileattr_get(dentry, &fa);
if (rc)
goto out;
flags = fa.flags;
if (fmt == COMPRESSION_FORMAT_NONE) {
flags &= ~FS_COMPR_FL;
} else if (fmt == COMPRESSION_FORMAT_DEFAULT ||
fmt == COMPRESSION_FORMAT_LZNT1) {
flags |= FS_COMPR_FL;
} else {
rc = -EINVAL;
goto out;
}
if (flags != fa.flags) {
fileattr_fill_flags(&fa, flags);
rc = mnt_want_write_file(fp->filp);
if (rc)
goto out;
rc = vfs_fileattr_set(idmap, dentry, &fa);
mnt_drop_write_file(fp->filp);
if (rc)
goto out;
}
old_fattr = fp->f_ci->m_fattr;
if (fmt == COMPRESSION_FORMAT_NONE)
fp->f_ci->m_fattr &= ~FILE_ATTRIBUTE_COMPRESSED_LE;
else
fp->f_ci->m_fattr |= FILE_ATTRIBUTE_COMPRESSED_LE;
if (fp->f_ci->m_fattr != old_fattr &&
test_share_config_flag(work->tcon->share_conf,
KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
struct xattr_dos_attrib da;
rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da);
if (rc <= 0) {
rc = 0;
goto out;
}
da.attr = le32_to_cpu(fp->f_ci->m_fattr);
rc = ksmbd_vfs_set_dos_attrib_xattr(idmap,
&fp->filp->f_path,
&da, true);
if (rc)
rc = 0;
}
out:
return rc;
}

1
fs/smb/server/vfs.h
View File

@ -170,4 +170,5 @@ int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap,
struct inode *parent_inode);
void ksmbd_vfs_update_compressed_fattr(struct dentry *dentry, __le32 *fattr);
int ksmbd_vfs_get_compression(struct ksmbd_file *fp, u16 *fmt);
int ksmbd_vfs_set_compression(struct ksmbd_work *work, struct ksmbd_file *fp, u16 fmt);
#endif /* __KSMBD_VFS_H__ */