/* * fs/cifs/xattr.c * * Copyright (c) International Business Machines Corp., 2003, 2007 * 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; full_path = build_path_from_dentry(direntry); 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 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? */ } 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: 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; full_path = build_path_from_dentry(direntry); 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")); 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: 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; full_path = build_path_from_dentry(direntry); 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); #ifdef CONFIG_CIFS_EXPERIMENTAL else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) { __u16 fid; int oplock = 0; struct cifs_ntsd *pacl = NULL; __u32 buflen = 0; if (experimEnabled) rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, GENERIC_READ, 0, &fid, &oplock, NULL, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); /* else rc is EOPNOTSUPP from above */ if (rc == 0) { rc = CIFSSMBGetCIFSACL(xid, pTcon, fid, &pacl, &buflen); CIFSSMBClose(xid, pTcon, fid); } } #endif /* EXPERIMENTAL */ #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 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: 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; cifs_sb = CIFS_SB(sb); pTcon = cifs_sb->tcon; if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) return -EOPNOTSUPP; xid = GetXid(); full_path = build_path_from_dentry(direntry); 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); kfree(full_path); FreeXid(xid); #endif return rc; }