/* * fs/cifs/xattr.c * * Copyright (c) International Business Machines Corp., 2003 * Author(s): Steve French (sfrench@us.ibm.com) * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published * by the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/fs.h> #include <linux/posix_acl_xattr.h> #include "cifsfs.h" #include "cifspdu.h" #include "cifsglob.h" #include "cifsproto.h" #include "cifs_debug.h" #define MAX_EA_VALUE_SIZE 65535 #define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib" #define CIFS_XATTR_USER_PREFIX "user." #define CIFS_XATTR_SYSTEM_PREFIX "system." #define CIFS_XATTR_OS2_PREFIX "os2." #define CIFS_XATTR_SECURITY_PREFIX ".security" #define CIFS_XATTR_TRUSTED_PREFIX "trusted." #define XATTR_TRUSTED_PREFIX_LEN 8 #define XATTR_SECURITY_PREFIX_LEN 9 /* BB need to add server (Samba e.g) support for security and trusted prefix */ int cifs_removexattr(struct dentry * direntry, const char * ea_name) { int rc = -EOPNOTSUPP; #ifdef CONFIG_CIFS_XATTR int xid; struct cifs_sb_info *cifs_sb; struct cifsTconInfo *pTcon; struct super_block * sb; char * full_path; if(direntry == NULL) return -EIO; if(direntry->d_inode == NULL) return -EIO; sb = direntry->d_inode->i_sb; if(sb == NULL) return -EIO; xid = GetXid(); cifs_sb = CIFS_SB(sb); pTcon = cifs_sb->tcon; down(&sb->s_vfs_rename_sem); full_path = build_path_from_dentry(direntry); up(&sb->s_vfs_rename_sem); if(full_path == NULL) { FreeXid(xid); return -ENOMEM; } if(ea_name == NULL) { cFYI(1,("Null xattr names not supported")); } else if(strncmp(ea_name,CIFS_XATTR_USER_PREFIX,5) && (strncmp(ea_name,CIFS_XATTR_OS2_PREFIX,4))) { cFYI(1,("illegal xattr namespace %s (only user namespace supported)",ea_name)); /* BB what if no namespace prefix? */ /* Should we just pass them to server, except for system and perhaps security prefixes? */ } else { if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) goto remove_ea_exit; ea_name+=5; /* skip past user. prefix */ rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,NULL, (__u16)0, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); } remove_ea_exit: if (full_path) kfree(full_path); FreeXid(xid); #endif return rc; } int cifs_setxattr(struct dentry * direntry, const char * ea_name, const void * ea_value, size_t value_size, int flags) { int rc = -EOPNOTSUPP; #ifdef CONFIG_CIFS_XATTR int xid; struct cifs_sb_info *cifs_sb; struct cifsTconInfo *pTcon; struct super_block * sb; char * full_path; if(direntry == NULL) return -EIO; if(direntry->d_inode == NULL) return -EIO; sb = direntry->d_inode->i_sb; if(sb == NULL) return -EIO; xid = GetXid(); cifs_sb = CIFS_SB(sb); pTcon = cifs_sb->tcon; down(&sb->s_vfs_rename_sem); full_path = build_path_from_dentry(direntry); up(&sb->s_vfs_rename_sem); if(full_path == NULL) { FreeXid(xid); return -ENOMEM; } /* return dos attributes as pseudo xattr */ /* return alt name if available as pseudo attr */ /* if proc/fs/cifs/streamstoxattr is set then search server for EAs or streams to returns as xattrs */ if(value_size > MAX_EA_VALUE_SIZE) { cFYI(1,("size of EA value too large")); if(full_path) kfree(full_path); FreeXid(xid); return -EOPNOTSUPP; } if(ea_name == NULL) { cFYI(1,("Null xattr names not supported")); } else if(strncmp(ea_name,CIFS_XATTR_USER_PREFIX,5) == 0) { if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) goto set_ea_exit; if(strncmp(ea_name,CIFS_XATTR_DOS_ATTRIB,14) == 0) { cFYI(1,("attempt to set cifs inode metadata")); } ea_name += 5; /* skip past user. prefix */ rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,ea_value, (__u16)value_size, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); } else if(strncmp(ea_name, CIFS_XATTR_OS2_PREFIX,4) == 0) { if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) goto set_ea_exit; ea_name += 4; /* skip past os2. prefix */ rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,ea_value, (__u16)value_size, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); } else { int temp; temp = strncmp(ea_name,POSIX_ACL_XATTR_ACCESS, strlen(POSIX_ACL_XATTR_ACCESS)); if (temp == 0) { #ifdef CONFIG_CIFS_POSIX if(sb->s_flags & MS_POSIXACL) rc = CIFSSMBSetPosixACL(xid, pTcon,full_path, ea_value, (const int)value_size, ACL_TYPE_ACCESS,cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); cFYI(1,("set POSIX ACL rc %d",rc)); #else cFYI(1,("set POSIX ACL not supported")); #endif } else if(strncmp(ea_name,POSIX_ACL_XATTR_DEFAULT,strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) { #ifdef CONFIG_CIFS_POSIX if(sb->s_flags & MS_POSIXACL) rc = CIFSSMBSetPosixACL(xid, pTcon,full_path, ea_value, (const int)value_size, ACL_TYPE_DEFAULT, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); cFYI(1,("set POSIX default ACL rc %d",rc)); #else cFYI(1,("set default POSIX ACL not supported")); #endif } else { cFYI(1,("illegal xattr request %s (only user namespace supported)",ea_name)); /* BB what if no namespace prefix? */ /* Should we just pass them to server, except for system and perhaps security prefixes? */ } } set_ea_exit: if (full_path) kfree(full_path); FreeXid(xid); #endif return rc; } ssize_t cifs_getxattr(struct dentry * direntry, const char * ea_name, void * ea_value, size_t buf_size) { ssize_t rc = -EOPNOTSUPP; #ifdef CONFIG_CIFS_XATTR int xid; struct cifs_sb_info *cifs_sb; struct cifsTconInfo *pTcon; struct super_block * sb; char * full_path; if(direntry == NULL) return -EIO; if(direntry->d_inode == NULL) return -EIO; sb = direntry->d_inode->i_sb; if(sb == NULL) return -EIO; xid = GetXid(); cifs_sb = CIFS_SB(sb); pTcon = cifs_sb->tcon; down(&sb->s_vfs_rename_sem); full_path = build_path_from_dentry(direntry); up(&sb->s_vfs_rename_sem); if(full_path == NULL) { FreeXid(xid); return -ENOMEM; } /* return dos attributes as pseudo xattr */ /* return alt name if available as pseudo attr */ if(ea_name == NULL) { cFYI(1,("Null xattr names not supported")); } else if(strncmp(ea_name,CIFS_XATTR_USER_PREFIX,5) == 0) { if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) goto get_ea_exit; if(strncmp(ea_name,CIFS_XATTR_DOS_ATTRIB,14) == 0) { cFYI(1,("attempt to query cifs inode metadata")); /* revalidate/getattr then populate from inode */ } /* BB add else when above is implemented */ ea_name += 5; /* skip past user. prefix */ rc = CIFSSMBQueryEA(xid,pTcon,full_path,ea_name,ea_value, buf_size, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); } else if(strncmp(ea_name, CIFS_XATTR_OS2_PREFIX,4) == 0) { if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) goto get_ea_exit; ea_name += 4; /* skip past os2. prefix */ rc = CIFSSMBQueryEA(xid,pTcon,full_path,ea_name,ea_value, buf_size, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); } else if(strncmp(ea_name,POSIX_ACL_XATTR_ACCESS,strlen(POSIX_ACL_XATTR_ACCESS)) == 0) { #ifdef CONFIG_CIFS_POSIX if(sb->s_flags & MS_POSIXACL) rc = CIFSSMBGetPosixACL(xid, pTcon, full_path, ea_value, buf_size, ACL_TYPE_ACCESS, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); #else cFYI(1,("query POSIX ACL not supported yet")); #endif /* CONFIG_CIFS_POSIX */ } else if(strncmp(ea_name,POSIX_ACL_XATTR_DEFAULT,strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) { #ifdef CONFIG_CIFS_POSIX if(sb->s_flags & MS_POSIXACL) rc = CIFSSMBGetPosixACL(xid, pTcon, full_path, ea_value, buf_size, ACL_TYPE_DEFAULT, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); #else cFYI(1,("query POSIX default ACL not supported yet")); #endif } else if(strncmp(ea_name, CIFS_XATTR_TRUSTED_PREFIX,XATTR_TRUSTED_PREFIX_LEN) == 0) { cFYI(1,("Trusted xattr namespace not supported yet")); } else if(strncmp(ea_name, CIFS_XATTR_SECURITY_PREFIX,XATTR_SECURITY_PREFIX_LEN) == 0) { cFYI(1,("Security xattr namespace not supported yet")); } else { cFYI(1,("illegal xattr name request %s (only user namespace supported)",ea_name)); } /* We could add an additional check for streams ie if proc/fs/cifs/streamstoxattr is set then search server for EAs or streams to returns as xattrs */ if(rc == -EINVAL) rc = -EOPNOTSUPP; get_ea_exit: if (full_path) kfree(full_path); FreeXid(xid); #endif return rc; } ssize_t cifs_listxattr(struct dentry * direntry, char * data, size_t buf_size) { ssize_t rc = -EOPNOTSUPP; #ifdef CONFIG_CIFS_XATTR int xid; struct cifs_sb_info *cifs_sb; struct cifsTconInfo *pTcon; struct super_block * sb; char * full_path; if(direntry == NULL) return -EIO; if(direntry->d_inode == NULL) return -EIO; sb = direntry->d_inode->i_sb; if(sb == NULL) return -EIO; xid = GetXid(); cifs_sb = CIFS_SB(sb); pTcon = cifs_sb->tcon; down(&sb->s_vfs_rename_sem); full_path = build_path_from_dentry(direntry); up(&sb->s_vfs_rename_sem); if(full_path == NULL) { FreeXid(xid); return -ENOMEM; } /* return dos attributes as pseudo xattr */ /* return alt name if available as pseudo attr */ /* if proc/fs/cifs/streamstoxattr is set then search server for EAs or streams to returns as xattrs */ rc = CIFSSMBQAllEAs(xid,pTcon,full_path,data,buf_size, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); if (full_path) kfree(full_path); FreeXid(xid); #endif return rc; }