| /* |
| * 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 = FALSE; |
| 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; |
| } |