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-rw-r--r--fs/cifs/xattr.c424
1 files changed, 424 insertions, 0 deletions
diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c
new file mode 100644
index 000000000..ff9e1f8b1
--- /dev/null
+++ b/fs/cifs/xattr.c
@@ -0,0 +1,424 @@
+/*
+ * 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 <linux/slab.h>
+#include <linux/xattr.h>
+#include "cifsfs.h"
+#include "cifspdu.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
+#include "cifs_fs_sb.h"
+#include "cifs_unicode.h"
+
+#define MAX_EA_VALUE_SIZE 65535
+#define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
+#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
+
+/* 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
+ unsigned int xid;
+ struct cifs_sb_info *cifs_sb;
+ struct tcon_link *tlink;
+ struct cifs_tcon *pTcon;
+ struct super_block *sb;
+ char *full_path = NULL;
+
+ if (direntry == NULL)
+ return -EIO;
+ if (d_really_is_negative(direntry))
+ return -EIO;
+ sb = d_inode(direntry)->i_sb;
+ if (sb == NULL)
+ return -EIO;
+
+ cifs_sb = CIFS_SB(sb);
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink))
+ return PTR_ERR(tlink);
+ pTcon = tlink_tcon(tlink);
+
+ xid = get_xid();
+
+ full_path = build_path_from_dentry(direntry);
+ if (full_path == NULL) {
+ rc = -ENOMEM;
+ goto remove_ea_exit;
+ }
+ if (ea_name == NULL) {
+ cifs_dbg(FYI, "Null xattr names not supported\n");
+ } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
+ && (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN))) {
+ cifs_dbg(FYI,
+ "illegal xattr request %s (only user namespace supported)\n",
+ 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 += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
+ if (pTcon->ses->server->ops->set_EA)
+ rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
+ full_path, ea_name, NULL, (__u16)0,
+ cifs_sb->local_nls, cifs_remap(cifs_sb));
+ }
+remove_ea_exit:
+ kfree(full_path);
+ free_xid(xid);
+ cifs_put_tlink(tlink);
+#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
+ unsigned int xid;
+ struct cifs_sb_info *cifs_sb;
+ struct tcon_link *tlink;
+ struct cifs_tcon *pTcon;
+ struct super_block *sb;
+ char *full_path;
+
+ if (direntry == NULL)
+ return -EIO;
+ if (d_really_is_negative(direntry))
+ return -EIO;
+ sb = d_inode(direntry)->i_sb;
+ if (sb == NULL)
+ return -EIO;
+
+ cifs_sb = CIFS_SB(sb);
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink))
+ return PTR_ERR(tlink);
+ pTcon = tlink_tcon(tlink);
+
+ xid = get_xid();
+
+ full_path = build_path_from_dentry(direntry);
+ if (full_path == NULL) {
+ rc = -ENOMEM;
+ goto set_ea_exit;
+ }
+ /* 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) {
+ cifs_dbg(FYI, "size of EA value too large\n");
+ rc = -EOPNOTSUPP;
+ goto set_ea_exit;
+ }
+
+ if (ea_name == NULL) {
+ cifs_dbg(FYI, "Null xattr names not supported\n");
+ } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
+ == 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)
+ cifs_dbg(FYI, "attempt to set cifs inode metadata\n");
+
+ ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
+ if (pTcon->ses->server->ops->set_EA)
+ rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
+ full_path, ea_name, ea_value, (__u16)value_size,
+ cifs_sb->local_nls, cifs_remap(cifs_sb));
+ } else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN)
+ == 0) {
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
+ goto set_ea_exit;
+
+ ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
+ if (pTcon->ses->server->ops->set_EA)
+ rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
+ full_path, ea_name, ea_value, (__u16)value_size,
+ cifs_sb->local_nls, cifs_remap(cifs_sb));
+ } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
+ strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
+#ifdef CONFIG_CIFS_ACL
+ struct cifs_ntsd *pacl;
+ pacl = kmalloc(value_size, GFP_KERNEL);
+ if (!pacl) {
+ rc = -ENOMEM;
+ } else {
+ memcpy(pacl, ea_value, value_size);
+ if (pTcon->ses->server->ops->set_acl)
+ rc = pTcon->ses->server->ops->set_acl(pacl,
+ value_size, d_inode(direntry),
+ full_path, CIFS_ACL_DACL);
+ else
+ rc = -EOPNOTSUPP;
+ if (rc == 0) /* force revalidate of the inode */
+ CIFS_I(d_inode(direntry))->time = 0;
+ kfree(pacl);
+ }
+#else
+ cifs_dbg(FYI, "Set CIFS ACL not supported yet\n");
+#endif /* CONFIG_CIFS_ACL */
+ } 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_remap(cifs_sb));
+ cifs_dbg(FYI, "set POSIX ACL rc %d\n", rc);
+#else
+ cifs_dbg(FYI, "set POSIX ACL not supported\n");
+#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_remap(cifs_sb));
+ cifs_dbg(FYI, "set POSIX default ACL rc %d\n", rc);
+#else
+ cifs_dbg(FYI, "set default POSIX ACL not supported\n");
+#endif
+ } else {
+ cifs_dbg(FYI, "illegal xattr request %s (only user namespace supported)\n",
+ 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);
+ free_xid(xid);
+ cifs_put_tlink(tlink);
+#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
+ unsigned int xid;
+ struct cifs_sb_info *cifs_sb;
+ struct tcon_link *tlink;
+ struct cifs_tcon *pTcon;
+ struct super_block *sb;
+ char *full_path;
+
+ if (direntry == NULL)
+ return -EIO;
+ if (d_really_is_negative(direntry))
+ return -EIO;
+ sb = d_inode(direntry)->i_sb;
+ if (sb == NULL)
+ return -EIO;
+
+ cifs_sb = CIFS_SB(sb);
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink))
+ return PTR_ERR(tlink);
+ pTcon = tlink_tcon(tlink);
+
+ xid = get_xid();
+
+ full_path = build_path_from_dentry(direntry);
+ if (full_path == NULL) {
+ rc = -ENOMEM;
+ goto get_ea_exit;
+ }
+ /* return dos attributes as pseudo xattr */
+ /* return alt name if available as pseudo attr */
+ if (ea_name == NULL) {
+ cifs_dbg(FYI, "Null xattr names not supported\n");
+ } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
+ == 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) {
+ cifs_dbg(FYI, "attempt to query cifs inode metadata\n");
+ /* revalidate/getattr then populate from inode */
+ } /* BB add else when above is implemented */
+ ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
+ if (pTcon->ses->server->ops->query_all_EAs)
+ rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
+ full_path, ea_name, ea_value, buf_size,
+ cifs_sb->local_nls, cifs_remap(cifs_sb));
+ } else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
+ goto get_ea_exit;
+
+ ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
+ if (pTcon->ses->server->ops->query_all_EAs)
+ rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
+ full_path, ea_name, ea_value, buf_size,
+ cifs_sb->local_nls, cifs_remap(cifs_sb));
+ } 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_remap(cifs_sb));
+#else
+ cifs_dbg(FYI, "Query POSIX ACL not supported yet\n");
+#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_remap(cifs_sb));
+#else
+ cifs_dbg(FYI, "Query POSIX default ACL not supported yet\n");
+#endif /* CONFIG_CIFS_POSIX */
+ } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
+ strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
+#ifdef CONFIG_CIFS_ACL
+ u32 acllen;
+ struct cifs_ntsd *pacl;
+
+ if (pTcon->ses->server->ops->get_acl == NULL)
+ goto get_ea_exit; /* rc already EOPNOTSUPP */
+
+ pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
+ d_inode(direntry), full_path, &acllen);
+ if (IS_ERR(pacl)) {
+ rc = PTR_ERR(pacl);
+ cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
+ __func__, rc);
+ } else {
+ if (ea_value) {
+ if (acllen > buf_size)
+ acllen = -ERANGE;
+ else
+ memcpy(ea_value, pacl, acllen);
+ }
+ rc = acllen;
+ kfree(pacl);
+ }
+#else
+ cifs_dbg(FYI, "Query CIFS ACL not supported yet\n");
+#endif /* CONFIG_CIFS_ACL */
+ } else if (strncmp(ea_name,
+ XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
+ cifs_dbg(FYI, "Trusted xattr namespace not supported yet\n");
+ } else if (strncmp(ea_name,
+ XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) {
+ cifs_dbg(FYI, "Security xattr namespace not supported yet\n");
+ } else
+ cifs_dbg(FYI,
+ "illegal xattr request %s (only user namespace supported)\n",
+ 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);
+ free_xid(xid);
+ cifs_put_tlink(tlink);
+#endif
+ return rc;
+}
+
+ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
+{
+ ssize_t rc = -EOPNOTSUPP;
+#ifdef CONFIG_CIFS_XATTR
+ unsigned int xid;
+ struct cifs_sb_info *cifs_sb;
+ struct tcon_link *tlink;
+ struct cifs_tcon *pTcon;
+ struct super_block *sb;
+ char *full_path;
+
+ if (direntry == NULL)
+ return -EIO;
+ if (d_really_is_negative(direntry))
+ return -EIO;
+ sb = d_inode(direntry)->i_sb;
+ if (sb == NULL)
+ return -EIO;
+
+ cifs_sb = CIFS_SB(sb);
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
+ return -EOPNOTSUPP;
+
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink))
+ return PTR_ERR(tlink);
+ pTcon = tlink_tcon(tlink);
+
+ xid = get_xid();
+
+ full_path = build_path_from_dentry(direntry);
+ if (full_path == NULL) {
+ rc = -ENOMEM;
+ goto list_ea_exit;
+ }
+ /* 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 (pTcon->ses->server->ops->query_all_EAs)
+ rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
+ full_path, NULL, data, buf_size,
+ cifs_sb->local_nls, cifs_remap(cifs_sb));
+list_ea_exit:
+ kfree(full_path);
+ free_xid(xid);
+ cifs_put_tlink(tlink);
+#endif
+ return rc;
+}
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