Commit c18c842b authored by Steve French's avatar Steve French
Browse files

[CIFS] Allow disabling CIFS Unix Extensions as mount option 



Previously the only way to do this was to umount all mounts to that server,
turn off a proc setting (/proc/fs/cifs/LinuxExtensionsEnabled).

Fixes Samba bugzilla bug number: 4582 (and also 2008)

Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
parent 63135e08

fs/cifs/cifsfs.c

+2 −2
Original line number Diff line number Diff line
@@ -316,10 +316,10 @@ cifs_show_options(struct seq_file *s, struct vfsmount *m) 
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)

			seq_printf(s, ",posixpaths");

		if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) ||

		   !(cifs_sb->tcon->ses->capabilities & CAP_UNIX))

		   !(cifs_sb->tcon->unix_ext))

			seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);

		if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) ||

		   !(cifs_sb->tcon->ses->capabilities & CAP_UNIX))

		   !(cifs_sb->tcon->unix_ext))

			seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);

		seq_printf(s, ",rsize=%d", cifs_sb->rsize);

		seq_printf(s, ",wsize=%d", cifs_sb->wsize);

fs/cifs/cifsglob.h

+3 −1
Original line number Diff line number Diff line
@@ -281,7 +281,9 @@ struct cifsTconInfo { 
	FILE_SYSTEM_UNIX_INFO fsUnixInfo;

	unsigned retry:1;

	unsigned nocase:1;

	/* BB add field for back pointer to sb struct? */

	unsigned unix_ext:1; /* if off disable Linux extensions to CIFS protocol

				for this mount even if server would support */

	/* BB add field for back pointer to sb struct(s)? */

};



/*

fs/cifs/cifssmb.c

+6 −15
Original line number Diff line number Diff line
@@ -3638,15 +3638,6 @@ int CIFSFindNext(const int xid, struct cifsTconInfo *tcon, 
	pSMB->SearchHandle = searchHandle;      /* always kept as le */

	pSMB->SearchCount =

		cpu_to_le16(CIFSMaxBufSize / sizeof (FILE_UNIX_INFO));

	/* test for Unix extensions */

/*	if (tcon->ses->capabilities & CAP_UNIX) {

		pSMB->InformationLevel = cpu_to_le16(SMB_FIND_FILE_UNIX);

		psrch_inf->info_level = SMB_FIND_FILE_UNIX;

	} else {

		pSMB->InformationLevel =

		   cpu_to_le16(SMB_FIND_FILE_DIRECTORY_INFO);

		psrch_inf->info_level = SMB_FIND_FILE_DIRECTORY_INFO;

	} */

	pSMB->InformationLevel = cpu_to_le16(psrch_inf->info_level);

	pSMB->ResumeKey = psrch_inf->resume_key;

	pSMB->SearchFlags =

fs/cifs/connect.c

+24 −7
Original line number Diff line number Diff line
@@ -85,6 +85,7 @@ struct smb_vol { 
	unsigned direct_io:1;

	unsigned remap:1;   /* set to remap seven reserved chars in filenames */

	unsigned posix_paths:1;   /* unset to not ask for posix pathnames. */

	unsigned no_linux_ext:1;

	unsigned sfu_emul:1;

	unsigned nullauth:1; /* attempt to authenticate with null user */

	unsigned nocase;     /* request case insensitive filenames */
@@ -1192,6 +1193,10 @@ cifs_parse_mount_options(char *options, const char *devname, 
			vol->posix_paths = 1;

		} else if (strnicmp(data, "noposixpaths", 12) == 0) {

			vol->posix_paths = 0;

		} else if (strnicmp(data, "nounix", 6) == 0) {

			vol->no_linux_ext = 1;

		} else if (strnicmp(data, "nolinux", 7) == 0) {

			vol->no_linux_ext = 1;

		} else if ((strnicmp(data, "nocase", 6) == 0) ||

			   (strnicmp(data, "ignorecase", 10)  == 0)) {

			vol->nocase = 1;
@@ -1665,6 +1670,18 @@ void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon, 
	 * and once without posixacls or posix paths? */

	__u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);



	if (vol_info && vol_info->no_linux_ext) {

		tcon->fsUnixInfo.Capability = 0;

		tcon->unix_ext = 0; /* Unix Extensions disabled */

		cFYI(1, ("Linux protocol extensions disabled"));

		return;

	} else if (vol_info)

		tcon->unix_ext = 1; /* Unix Extensions supported */



	if (tcon->unix_ext == 0) {

		cFYI(1, ("Unix extensions disabled so not set on reconnect"));

		return;

	}



	if (!CIFSSMBQFSUnixInfo(xid, tcon)) {

		__u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
@@ -1678,10 +1695,6 @@ void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon, 
				cap &= ~CIFS_UNIX_POSIX_ACL_CAP;

			if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0)

				cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;









		}



		cap &= CIFS_UNIX_CAP_MASK;
@@ -2176,13 +2189,17 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb, 


		/* tell server which Unix caps we support */

		if (tcon->ses->capabilities & CAP_UNIX)

			/* reset of caps checks mount to see if unix extensions

			   disabled for just this mount */

			reset_cifs_unix_caps(xid, tcon, sb, &volume_info);

		else if (cifs_sb->rsize > (1024 * 127)) {

		else

			tcon->unix_ext = 0; /* server does not support them */



		if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {

			cifs_sb->rsize = 1024 * 127;

#ifdef CONFIG_CIFS_DEBUG2

			cFYI(1, ("no very large read support, rsize 127K"));

			cFYI(1, ("no very large read support, rsize now 127K"));

#endif



		}

		if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))

			cifs_sb->wsize = min(cifs_sb->wsize,

fs/cifs/dir.c

+5 −6
Original line number Diff line number Diff line
@@ -207,8 +207,7 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode, 
	} else {

		/* If Open reported that we actually created a file

		then we now have to set the mode if possible */

		if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&

			(oplock & CIFS_CREATE_ACTION)) {

		if ((pTcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {

			mode &= ~current->fs->umask;

			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {

				CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
@@ -235,8 +234,8 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode, 
			/* Could set r/o dos attribute if mode & 0222 == 0 */

		}



	/* BB server might mask mode so we have to query for Unix case*/

		if (pTcon->ses->capabilities & CAP_UNIX)

		/* server might mask mode so we have to query for it */

		if (pTcon->unix_ext)

			rc = cifs_get_inode_info_unix(&newinode, full_path,

						 inode->i_sb, xid);

		else {
@@ -337,7 +336,7 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, 
	full_path = build_path_from_dentry(direntry);

	if (full_path == NULL)

		rc = -ENOMEM;

	else if (pTcon->ses->capabilities & CAP_UNIX) {

	else if (pTcon->unix_ext) {

		mode &= ~current->fs->umask;

		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {

			rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
@@ -491,7 +490,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, 
	cFYI(1,

	     (" Full path: %s inode = 0x%p", full_path, direntry->d_inode));



	if (pTcon->ses->capabilities & CAP_UNIX)

	if (pTcon->unix_ext)

		rc = cifs_get_inode_info_unix(&newInode, full_path,

					      parent_dir_inode->i_sb, xid);

	else