From 9a49e221a64111535f65e9c8804db24d11eaff8b Mon Sep 17 00:00:00 2001 From: Paulo Alcantara Date: Thu, 17 Aug 2023 12:34:07 -0300 Subject: [PATCH] smb: client: do not query reparse points twice on symlinks Save a roundtrip by getting the reparse point tag and buffer at once in ->query_reparse_point() and then pass the buffer down to ->query_symlink(). Signed-off-by: Paulo Alcantara (SUSE) Signed-off-by: Steve French --- fs/smb/client/cifsglob.h | 20 ++++-- fs/smb/client/inode.c | 19 ++++-- fs/smb/client/smb1ops.c | 11 ++-- fs/smb/client/smb2ops.c | 166 +++++++---------------------------------------- 4 files changed, 55 insertions(+), 161 deletions(-) diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h index 95e62502cb01..639a61417b08 100644 --- a/fs/smb/client/cifsglob.h +++ b/fs/smb/client/cifsglob.h @@ -336,10 +336,13 @@ struct smb_version_operations { /* query file data from the server */ int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon, struct cifsFileInfo *cfile, struct cifs_open_info_data *data); - /* query reparse tag from srv to determine which type of special file */ - int (*query_reparse_tag)(const unsigned int xid, struct cifs_tcon *tcon, - struct cifs_sb_info *cifs_sb, const char *path, - __u32 *reparse_tag); + /* query reparse point to determine which type of special file */ + int (*query_reparse_point)(const unsigned int xid, + struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, + const char *full_path, + u32 *tag, struct kvec *rsp, + int *rsp_buftype); /* get server index number */ int (*get_srv_inum)(const unsigned int xid, struct cifs_tcon *tcon, struct cifs_sb_info *cifs_sb, const char *full_path, u64 *uniqueid, @@ -388,9 +391,12 @@ struct smb_version_operations { const char *, const char *, struct cifs_sb_info *); /* query symlink target */ - int (*query_symlink)(const unsigned int, struct cifs_tcon *, - struct cifs_sb_info *, const char *, - char **, bool); + int (*query_symlink)(const unsigned int xid, + struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, + const char *full_path, + char **target_path, + struct kvec *rsp_iov); /* open a file for non-posix mounts */ int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, void *buf); diff --git a/fs/smb/client/inode.c b/fs/smb/client/inode.c index 51e2916730cf..96a09818aa5b 100644 --- a/fs/smb/client/inode.c +++ b/fs/smb/client/inode.c @@ -428,7 +428,7 @@ int cifs_get_inode_info_unix(struct inode **pinode, if (!server->ops->query_symlink) return -EOPNOTSUPP; rc = server->ops->query_symlink(xid, tcon, cifs_sb, full_path, - &fattr.cf_symlink_target, false); + &fattr.cf_symlink_target, NULL); if (rc) { cifs_dbg(FYI, "%s: query_symlink: %d\n", __func__, rc); goto cgiiu_exit; @@ -988,17 +988,21 @@ static int query_reparse(struct cifs_open_info_data *data, { struct TCP_Server_Info *server = tcon->ses->server; struct cifs_sb_info *cifs_sb = CIFS_SB(sb); - bool reparse_point = data->reparse_point; + struct kvec rsp_iov, *iov = NULL; + int rsp_buftype = CIFS_NO_BUFFER; u32 tag = data->reparse_tag; int rc = 0; - if (!tag && server->ops->query_reparse_tag) { - server->ops->query_reparse_tag(xid, tcon, cifs_sb, - full_path, &tag); + if (!tag && server->ops->query_reparse_point) { + rc = server->ops->query_reparse_point(xid, tcon, cifs_sb, + full_path, &tag, + &rsp_iov, &rsp_buftype); + if (!rc) + iov = &rsp_iov; } switch ((data->reparse_tag = tag)) { case 0: /* SMB1 symlink */ - reparse_point = false; + iov = NULL; fallthrough; case IO_REPARSE_TAG_NFS: case IO_REPARSE_TAG_SYMLINK: @@ -1006,10 +1010,11 @@ static int query_reparse(struct cifs_open_info_data *data, rc = server->ops->query_symlink(xid, tcon, cifs_sb, full_path, &data->symlink_target, - reparse_point); + iov); } break; } + free_rsp_buf(rsp_buftype, rsp_iov.iov_base); return rc; } diff --git a/fs/smb/client/smb1ops.c b/fs/smb/client/smb1ops.c index 094ef4fe2219..9bf8735cdd1e 100644 --- a/fs/smb/client/smb1ops.c +++ b/fs/smb/client/smb1ops.c @@ -972,13 +972,16 @@ cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon, #endif } -static int -cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon, - struct cifs_sb_info *cifs_sb, const char *full_path, - char **target_path, bool is_reparse_point) +static int cifs_query_symlink(const unsigned int xid, + struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, + const char *full_path, + char **target_path, + struct kvec *rsp_iov) { int rc; int oplock = 0; + bool is_reparse_point = !!rsp_iov; struct cifs_fid fid; struct cifs_open_parms oparms; diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c index 0f62bc373ad0..5eb2720f4aa7 100644 --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -2948,153 +2948,30 @@ parse_reparse_point(struct reparse_data_buffer *buf, } } -static int -smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon, - struct cifs_sb_info *cifs_sb, const char *full_path, - char **target_path, bool is_reparse_point) +static int smb2_query_symlink(const unsigned int xid, + struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, + const char *full_path, + char **target_path, + struct kvec *rsp_iov) { - int rc; - __le16 *utf16_path = NULL; - __u8 oplock = SMB2_OPLOCK_LEVEL_NONE; - struct cifs_open_parms oparms; - struct cifs_fid fid; - struct kvec err_iov = {NULL, 0}; - struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses); - int flags = CIFS_CP_CREATE_CLOSE_OP; - struct smb_rqst rqst[3]; - int resp_buftype[3]; - struct kvec rsp_iov[3]; - struct kvec open_iov[SMB2_CREATE_IOV_SIZE]; - struct kvec io_iov[SMB2_IOCTL_IOV_SIZE]; - struct kvec close_iov[1]; - struct smb2_create_rsp *create_rsp; - struct smb2_ioctl_rsp *ioctl_rsp; - struct reparse_data_buffer *reparse_buf; - int create_options = is_reparse_point ? OPEN_REPARSE_POINT : 0; - u32 plen; + struct reparse_data_buffer *buf; + struct smb2_ioctl_rsp *io = rsp_iov->iov_base; + u32 plen = le32_to_cpu(io->OutputCount); cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path); - *target_path = NULL; - - if (smb3_encryption_required(tcon)) - flags |= CIFS_TRANSFORM_REQ; - - 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(full_path, cifs_sb); - if (!utf16_path) - return -ENOMEM; - - /* Open */ - memset(&open_iov, 0, sizeof(open_iov)); - rqst[0].rq_iov = open_iov; - rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE; - - oparms = (struct cifs_open_parms) { - .tcon = tcon, - .path = full_path, - .desired_access = FILE_READ_ATTRIBUTES, - .disposition = FILE_OPEN, - .create_options = cifs_create_options(cifs_sb, create_options), - .fid = &fid, - }; - - rc = SMB2_open_init(tcon, server, - &rqst[0], &oplock, &oparms, utf16_path); - if (rc) - goto querty_exit; - smb2_set_next_command(tcon, &rqst[0]); - - - /* IOCTL */ - memset(&io_iov, 0, sizeof(io_iov)); - rqst[1].rq_iov = io_iov; - rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE; - - rc = SMB2_ioctl_init(tcon, server, - &rqst[1], fid.persistent_fid, - fid.volatile_fid, FSCTL_GET_REPARSE_POINT, NULL, 0, - CIFSMaxBufSize - - MAX_SMB2_CREATE_RESPONSE_SIZE - - MAX_SMB2_CLOSE_RESPONSE_SIZE); - if (rc) - goto querty_exit; - - smb2_set_next_command(tcon, &rqst[1]); - smb2_set_related(&rqst[1]); - - - /* Close */ - memset(&close_iov, 0, sizeof(close_iov)); - rqst[2].rq_iov = close_iov; - rqst[2].rq_nvec = 1; - - rc = SMB2_close_init(tcon, server, - &rqst[2], COMPOUND_FID, COMPOUND_FID, false); - if (rc) - goto querty_exit; - - smb2_set_related(&rqst[2]); - - rc = compound_send_recv(xid, tcon->ses, server, - flags, 3, rqst, - resp_buftype, rsp_iov); - - create_rsp = rsp_iov[0].iov_base; - if (create_rsp && create_rsp->hdr.Status) - err_iov = rsp_iov[0]; - ioctl_rsp = rsp_iov[1].iov_base; - - /* - * Open was successful and we got an ioctl response. - */ - if ((rc == 0) && (is_reparse_point)) { - /* See MS-FSCC 2.3.23 */ - - reparse_buf = (struct reparse_data_buffer *) - ((char *)ioctl_rsp + - le32_to_cpu(ioctl_rsp->OutputOffset)); - plen = le32_to_cpu(ioctl_rsp->OutputCount); - - if (plen + le32_to_cpu(ioctl_rsp->OutputOffset) > - rsp_iov[1].iov_len) { - cifs_tcon_dbg(VFS, "srv returned invalid ioctl len: %d\n", - plen); - rc = -EIO; - goto querty_exit; - } - - rc = parse_reparse_point(reparse_buf, plen, target_path, - cifs_sb); - goto querty_exit; - } - - if (!rc || !err_iov.iov_base) { - rc = -ENOENT; - goto querty_exit; - } - - rc = smb2_parse_symlink_response(cifs_sb, &err_iov, target_path); - - querty_exit: - cifs_dbg(FYI, "query symlink rc %d\n", rc); - kfree(utf16_path); - SMB2_open_free(&rqst[0]); - SMB2_ioctl_free(&rqst[1]); - SMB2_close_free(&rqst[2]); - free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base); - free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base); - free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base); - return rc; + buf = (struct reparse_data_buffer *)((u8 *)io + + le32_to_cpu(io->OutputOffset)); + return parse_reparse_point(buf, plen, target_path, cifs_sb); } -int -smb2_query_reparse_tag(const unsigned int xid, struct cifs_tcon *tcon, - struct cifs_sb_info *cifs_sb, const char *full_path, - __u32 *tag) +static int smb2_query_reparse_point(const unsigned int xid, + struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, + const char *full_path, + u32 *tag, struct kvec *rsp, + int *rsp_buftype) { int rc; __le16 *utf16_path = NULL; @@ -3205,6 +3082,9 @@ smb2_query_reparse_tag(const unsigned int xid, struct cifs_tcon *tcon, goto query_rp_exit; } *tag = le32_to_cpu(reparse_buf->ReparseTag); + *rsp = rsp_iov[1]; + *rsp_buftype = resp_buftype[1]; + resp_buftype[1] = CIFS_NO_BUFFER; } query_rp_exit: @@ -5503,7 +5383,7 @@ struct smb_version_operations smb30_operations = { .echo = SMB2_echo, .query_path_info = smb2_query_path_info, /* WSL tags introduced long after smb2.1, enable for SMB3, 3.11 only */ - .query_reparse_tag = smb2_query_reparse_tag, + .query_reparse_point = smb2_query_reparse_point, .get_srv_inum = smb2_get_srv_inum, .query_file_info = smb2_query_file_info, .set_path_size = smb2_set_path_size, @@ -5616,7 +5496,7 @@ struct smb_version_operations smb311_operations = { .can_echo = smb2_can_echo, .echo = SMB2_echo, .query_path_info = smb2_query_path_info, - .query_reparse_tag = smb2_query_reparse_tag, + .query_reparse_point = smb2_query_reparse_point, .get_srv_inum = smb2_get_srv_inum, .query_file_info = smb2_query_file_info, .set_path_size = smb2_set_path_size, -- 2.11.0