diff options
Diffstat (limited to 'fs/cifs/link.c')
| -rw-r--r-- | fs/cifs/link.c | 145 |
1 files changed, 137 insertions, 8 deletions
diff --git a/fs/cifs/link.c b/fs/cifs/link.c index 5657416d3483..2ec6037f61c7 100644 --- a/fs/cifs/link.c +++ b/fs/cifs/link.c @@ -28,6 +28,10 @@ #include "cifsproto.h" #include "cifs_debug.h" #include "cifs_fs_sb.h" +#include "cifs_unicode.h" +#ifdef CONFIG_CIFS_SMB2 +#include "smb2proto.h" +#endif /* * M-F Symlink Functions - Begin @@ -401,6 +405,134 @@ cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, } /* + * SMB 2.1/SMB3 Protocol specific functions + */ +#ifdef CONFIG_CIFS_SMB2 +int +smb3_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, const unsigned char *path, + char *pbuf, unsigned int *pbytes_read) +{ + int rc; + struct cifs_fid fid; + struct cifs_open_parms oparms; + struct cifs_io_parms io_parms; + int buf_type = CIFS_NO_BUFFER; + __le16 *utf16_path; + __u8 oplock = SMB2_OPLOCK_LEVEL_II; + struct smb2_file_all_info *pfile_info = NULL; + + oparms.tcon = tcon; + oparms.cifs_sb = cifs_sb; + oparms.desired_access = GENERIC_READ; + oparms.create_options = CREATE_NOT_DIR; + if (backup_cred(cifs_sb)) + oparms.create_options |= CREATE_OPEN_BACKUP_INTENT; + oparms.disposition = FILE_OPEN; + oparms.fid = &fid; + oparms.reconnect = false; + + utf16_path = cifs_convert_path_to_utf16(path, cifs_sb); + if (utf16_path == NULL) + return -ENOMEM; + + pfile_info = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2, + GFP_KERNEL); + + if (pfile_info == NULL) { + kfree(utf16_path); + return -ENOMEM; + } + + rc = SMB2_open(xid, &oparms, utf16_path, &oplock, pfile_info, NULL); + if (rc) + goto qmf_out_open_fail; + + if (pfile_info->EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) { + /* it's not a symlink */ + rc = -ENOENT; /* Is there a better rc to return? */ + goto qmf_out; + } + + io_parms.netfid = fid.netfid; + io_parms.pid = current->tgid; + io_parms.tcon = tcon; + io_parms.offset = 0; + io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; + io_parms.persistent_fid = fid.persistent_fid; + io_parms.volatile_fid = fid.volatile_fid; + rc = SMB2_read(xid, &io_parms, pbytes_read, &pbuf, &buf_type); +qmf_out: + SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid); +qmf_out_open_fail: + kfree(utf16_path); + kfree(pfile_info); + return rc; +} + +int +smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, const unsigned char *path, + char *pbuf, unsigned int *pbytes_written) +{ + int rc; + struct cifs_fid fid; + struct cifs_open_parms oparms; + struct cifs_io_parms io_parms; + int create_options = CREATE_NOT_DIR; + __le16 *utf16_path; + __u8 oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE; + struct kvec iov[2]; + + if (backup_cred(cifs_sb)) + create_options |= CREATE_OPEN_BACKUP_INTENT; + + cifs_dbg(FYI, "%s: path: %s\n", __func__, path); + + utf16_path = cifs_convert_path_to_utf16(path, cifs_sb); + if (!utf16_path) + return -ENOMEM; + + oparms.tcon = tcon; + oparms.cifs_sb = cifs_sb; + oparms.desired_access = GENERIC_WRITE; + oparms.create_options = create_options; + oparms.disposition = FILE_CREATE; + oparms.fid = &fid; + oparms.reconnect = false; + + rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL); + if (rc) { + kfree(utf16_path); + return rc; + } + + io_parms.netfid = fid.netfid; + io_parms.pid = current->tgid; + io_parms.tcon = tcon; + io_parms.offset = 0; + io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; + io_parms.persistent_fid = fid.persistent_fid; + io_parms.volatile_fid = fid.volatile_fid; + + /* iov[0] is reserved for smb header */ + iov[1].iov_base = pbuf; + iov[1].iov_len = CIFS_MF_SYMLINK_FILE_SIZE; + + rc = SMB2_write(xid, &io_parms, pbytes_written, iov, 1); + + /* Make sure we wrote all of the symlink data */ + if ((rc == 0) && (*pbytes_written != CIFS_MF_SYMLINK_FILE_SIZE)) + rc = -EIO; + + SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid); + + kfree(utf16_path); + return rc; +} +#endif /* CONFIG_CIFS_SMB2 */ + +/* * M-F Symlink Functions - End */ @@ -435,8 +567,7 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode, if (tcon->unix_ext) rc = CIFSUnixCreateHardLink(xid, tcon, from_name, to_name, cifs_sb->local_nls, - cifs_sb->mnt_cifs_flags & - CIFS_MOUNT_MAP_SPECIAL_CHR); + cifs_remap(cifs_sb)); else { server = tcon->ses->server; if (!server->ops->create_hardlink) { @@ -461,11 +592,7 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode, spin_lock(&old_file->d_inode->i_lock); inc_nlink(old_file->d_inode); spin_unlock(&old_file->d_inode->i_lock); - /* - * BB should we make this contingent on superblock flag - * NOATIME? - */ - /* old_file->d_inode->i_ctime = CURRENT_TIME; */ + /* * parent dir timestamps will update from srv within a * second, would it really be worth it to set the parent @@ -475,7 +602,9 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode, } /* * if not oplocked will force revalidate to get info on source - * file from srv + * file from srv. Note Samba server prior to 4.2 has bug - + * not updating src file ctime on hardlinks but Windows servers + * handle it properly */ cifsInode->time = 0; |