Initial import

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;
+}