Do you remember which xfstests this fixes?
Also any ideas on whether we still need a fix for deleting an empty or
nonexistent xattr?
On Thu, Jun 20, 2019 at 7:03 PM Ronnie Sahlberg <lsahlber@xxxxxxxxxx> wrote:
>
> We store xattrs as Extended Attributes for SMB.
> Some servers treat the EA names as case-insensitive as well as converting them to all upper-case.
>
> This addresses that issue by adding a new mount option to convert all EA names to/from
> hexadecimal representation.
>
> Signed-off-by: Ronnie Sahlberg <lsahlber@xxxxxxxxxx>
> ---
> fs/cifs/cifs_fs_sb.h | 1 +
> fs/cifs/cifsfs.c | 3 +++
> fs/cifs/cifsglob.h | 3 ++-
> fs/cifs/connect.c | 7 +++++++
> fs/cifs/smb2ops.c | 58 ++++++++++++++++++++++++++++++++++++++++------------
> 5 files changed, 58 insertions(+), 14 deletions(-)
>
> diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h
> index ed49222abecb..11fb5f4d2b0e 100644
> --- a/fs/cifs/cifs_fs_sb.h
> +++ b/fs/cifs/cifs_fs_sb.h
> @@ -52,6 +52,7 @@
> #define CIFS_MOUNT_UID_FROM_ACL 0x2000000 /* try to get UID via special SID */
> #define CIFS_MOUNT_NO_HANDLE_CACHE 0x4000000 /* disable caching dir handles */
> #define CIFS_MOUNT_NO_DFS 0x8000000 /* disable DFS resolving */
> +#define CIFS_MOUNT_ENCODED_XATTR 0x10000000 /* encode the xattr names */
>
> struct cifs_sb_info {
> struct rb_root tlink_tree;
> diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
> index d06edebf3a73..c3c837ee3c4e 100644
> --- a/fs/cifs/cifsfs.c
> +++ b/fs/cifs/cifsfs.c
> @@ -471,6 +471,9 @@ cifs_show_options(struct seq_file *s, struct dentry *root)
> else
> seq_puts(s, ",noforcegid");
>
> + if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_ENCODED_XATTR)
> + seq_puts(s, ",endodedxattr");
> +
> cifs_show_address(s, tcon->ses->server);
>
> if (!tcon->unix_ext)
> diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
> index 4777b3c4a92c..b479207f7f74 100644
> --- a/fs/cifs/cifsglob.h
> +++ b/fs/cifs/cifsglob.h
> @@ -585,6 +585,7 @@ struct smb_vol {
> bool resilient:1; /* noresilient not required since not fored for CA */
> bool domainauto:1;
> bool rdma:1;
> + bool encoded_xattr:1;
> unsigned int bsize;
> unsigned int rsize;
> unsigned int wsize;
> @@ -617,7 +618,7 @@ struct smb_vol {
> CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
> CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
> CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \
> - CIFS_MOUNT_NO_DFS)
> + CIFS_MOUNT_NO_DFS|CIFS_MOUNT_ENCODED_XATTR)
>
> /**
> * Generic VFS superblock mount flags (s_flags) to consider when
> diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
> index 51f272377ae1..f955b28a9b38 100644
> --- a/fs/cifs/connect.c
> +++ b/fs/cifs/connect.c
> @@ -97,6 +97,7 @@ enum {
> Opt_persistent, Opt_nopersistent,
> Opt_resilient, Opt_noresilient,
> Opt_domainauto, Opt_rdma,
> + Opt_encodedxattr,
>
> /* Mount options which take numeric value */
> Opt_backupuid, Opt_backupgid, Opt_uid,
> @@ -194,6 +195,7 @@ static const match_table_t cifs_mount_option_tokens = {
> { Opt_noresilient, "noresilienthandles"},
> { Opt_domainauto, "domainauto"},
> { Opt_rdma, "rdma"},
> + { Opt_encodedxattr, "encodedxattr" },
>
> { Opt_backupuid, "backupuid=%s" },
> { Opt_backupgid, "backupgid=%s" },
> @@ -1911,6 +1913,9 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
> case Opt_rdma:
> vol->rdma = true;
> break;
> + case Opt_encodedxattr:
> + vol->encoded_xattr = 1;
> + break;
>
> /* Numeric Values */
> case Opt_backupuid:
> @@ -3986,6 +3991,8 @@ int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
> cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
> if (pvolume_info->override_gid)
> cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
> + if (pvolume_info->encoded_xattr)
> + cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_ENCODED_XATTR;
> if (pvolume_info->dynperm)
> cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
> if (pvolume_info->fsc)
> diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
> index 376577cc4159..e2684a6627bb 100644
> --- a/fs/cifs/smb2ops.c
> +++ b/fs/cifs/smb2ops.c
> @@ -891,7 +891,8 @@ smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
> static ssize_t
> move_smb2_ea_to_cifs(char *dst, size_t dst_size,
> struct smb2_file_full_ea_info *src, size_t src_size,
> - const unsigned char *ea_name)
> + const unsigned char *ea_name,
> + struct cifs_sb_info *cifs_sb)
> {
> int rc = 0;
> unsigned int ea_name_len = ea_name ? strlen(ea_name) : 0;
> @@ -905,6 +906,18 @@ move_smb2_ea_to_cifs(char *dst, size_t dst_size,
> value = &src->ea_data[src->ea_name_length + 1];
> value_len = (size_t)le16_to_cpu(src->ea_value_length);
>
> + if (cifs_sb->mnt_cifs_flags | CIFS_MOUNT_ENCODED_XATTR) {
> + if (name_len & 0x01) {
> + rc = -EINVAL;
> + goto out;
> + }
> + name_len = name_len / 2;
> + if (hex2bin(name, name, name_len)) {
> + rc = -EINVAL;
> + goto out;
> + }
> + }
> +
> if (name_len == 0)
> break;
>
> @@ -1018,7 +1031,8 @@ smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
> info = (struct smb2_file_full_ea_info *)(
> le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
> rc = move_smb2_ea_to_cifs(ea_data, buf_size, info,
> - le32_to_cpu(rsp->OutputBufferLength), ea_name);
> + le32_to_cpu(rsp->OutputBufferLength),
> + ea_name, cifs_sb);
>
> qeas_exit:
> kfree(utf16_path);
> @@ -1029,13 +1043,14 @@ smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
>
> static int
> smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
> - const char *path, const char *ea_name, const void *ea_value,
> + const char *path, const char *name, const void *ea_value,
> const __u16 ea_value_len, const struct nls_table *nls_codepage,
> struct cifs_sb_info *cifs_sb)
> {
> struct cifs_ses *ses = tcon->ses;
> __le16 *utf16_path = NULL;
> - int ea_name_len = strlen(ea_name);
> + char *ea_name = (char *)name;
> + int ea_name_len = strlen(name);
> int flags = 0;
> int len;
> struct smb_rqst rqst[3];
> @@ -1050,21 +1065,36 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
> void *data[1];
> struct smb2_file_full_ea_info *ea = NULL;
> struct kvec close_iov[1];
> - int rc;
> + int i, rc;
> +
> + memset(rqst, 0, sizeof(rqst));
> + resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
> + memset(rsp_iov, 0, sizeof(rsp_iov));
>
> if (smb3_encryption_required(tcon))
> flags |= CIFS_TRANSFORM_REQ;
>
> - if (ea_name_len > 255)
> - return -EINVAL;
> + /* Do we need to encode the name in hex ? */
> + if (cifs_sb->mnt_cifs_flags | CIFS_MOUNT_ENCODED_XATTR) {
> + ea_name = kzalloc(ea_name_len * 2 + 1, GFP_KERNEL);
> + if (ea_name == NULL) {
> + rc = -ENOMEM;
> + goto sea_exit;
> + }
> + bin2hex(ea_name, name, ea_name_len);
> + ea_name_len = 2 * ea_name_len;
> + }
>
> - utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
> - if (!utf16_path)
> - return -ENOMEM;
> + if (ea_name_len > 255) {
> + rc = -EINVAL;
> + goto sea_exit;
> + }
>
> - memset(rqst, 0, sizeof(rqst));
> - resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
> - memset(rsp_iov, 0, sizeof(rsp_iov));
> + utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
> + if (!utf16_path) {
> + rc = -ENOMEM;
> + goto sea_exit;
> + }
>
> if (ses->server->ops->query_all_EAs) {
> if (!ea_value) {
> @@ -1137,6 +1167,8 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
> resp_buftype, rsp_iov);
>
> sea_exit:
> + if (cifs_sb->mnt_cifs_flags | CIFS_MOUNT_ENCODED_XATTR)
> + kfree(ea_name);
> kfree(ea);
> kfree(utf16_path);
> SMB2_open_free(&rqst[0]);
> --
> 2.13.6
>
--
Thanks,
Steve
