Commit 608712fe authored by Jeff Layton's avatar Jeff Layton Committed by Steve French
Browse files

cifs: fix flags handling in cifs_posix_open 



The way flags are passed and converted for cifs_posix_open is rather
non-sensical. Some callers call cifs_posix_convert_flags on the flags
before they pass them to cifs_posix_open, whereas some don't. Two flag
conversion steps is just confusing though.

Change the function instead to clearly expect input in f_flags format,
and fix the callers to pass that in. Then, have cifs_posix_open call
cifs_convert_posix_flags to do the conversion. Move cifs_posix_open to
file.c as well so we can keep cifs_convert_posix_flags as a static
function.

Fix it also to not ignore O_CREAT, O_EXCL and O_TRUNC, and instead have
cifs_reopen_file mask those bits off before calling cifs_posix_open.

Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
Reviewed-by: default avatarSuresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
parent 2f4f26fc

fs/cifs/cifsproto.h

+1 −1
Original line number Diff line number Diff line
@@ -111,7 +111,7 @@ extern struct cifsFileInfo *cifs_new_fileinfo(struct inode *newinode, 
				unsigned int oflags, __u32 oplock);

extern int cifs_posix_open(char *full_path, struct inode **pinode,

				struct super_block *sb,

				int mode, int oflags,

				int mode, unsigned int f_flags,

				__u32 *poplock, __u16 *pnetfid, int xid);

void cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr);

extern void cifs_unix_basic_to_fattr(struct cifs_fattr *fattr,

fs/cifs/dir.c

+6 −93
Original line number Diff line number Diff line
@@ -181,93 +181,6 @@ cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle, struct file *file, 
	return pCifsFile;

}



int cifs_posix_open(char *full_path, struct inode **pinode,

			struct super_block *sb, int mode, int oflags,

			__u32 *poplock, __u16 *pnetfid, int xid)

{

	int rc;

	FILE_UNIX_BASIC_INFO *presp_data;

	__u32 posix_flags = 0;

	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);

	struct cifs_fattr fattr;

	struct tcon_link *tlink;

	struct cifsTconInfo *tcon;



	cFYI(1, "posix open %s", full_path);



	presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);

	if (presp_data == NULL)

		return -ENOMEM;



/* So far cifs posix extensions can only map the following flags.

   There are other valid fmode oflags such as FMODE_LSEEK, FMODE_PREAD, but

   so far we do not seem to need them, and we can treat them as local only */

	if ((oflags & (FMODE_READ | FMODE_WRITE)) ==

		(FMODE_READ | FMODE_WRITE))

		posix_flags = SMB_O_RDWR;

	else if (oflags & FMODE_READ)

		posix_flags = SMB_O_RDONLY;

	else if (oflags & FMODE_WRITE)

		posix_flags = SMB_O_WRONLY;

	if (oflags & O_CREAT)

		posix_flags |= SMB_O_CREAT;

	if (oflags & O_EXCL)

		posix_flags |= SMB_O_EXCL;

	if (oflags & O_TRUNC)

		posix_flags |= SMB_O_TRUNC;

	/* be safe and imply O_SYNC for O_DSYNC */

	if (oflags & O_DSYNC)

		posix_flags |= SMB_O_SYNC;

	if (oflags & O_DIRECTORY)

		posix_flags |= SMB_O_DIRECTORY;

	if (oflags & O_NOFOLLOW)

		posix_flags |= SMB_O_NOFOLLOW;

	if (oflags & O_DIRECT)

		posix_flags |= SMB_O_DIRECT;



	mode &= ~current_umask();



	tlink = cifs_sb_tlink(cifs_sb);

	if (IS_ERR(tlink)) {

		rc = PTR_ERR(tlink);

		goto posix_open_ret;

	}



	tcon = tlink_tcon(tlink);

	rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,

			     poplock, full_path, cifs_sb->local_nls,

			     cifs_sb->mnt_cifs_flags &

					CIFS_MOUNT_MAP_SPECIAL_CHR);

	cifs_put_tlink(tlink);



	if (rc)

		goto posix_open_ret;



	if (presp_data->Type == cpu_to_le32(-1))

		goto posix_open_ret; /* open ok, caller does qpathinfo */



	if (!pinode)

		goto posix_open_ret; /* caller does not need info */



	cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);



	/* get new inode and set it up */

	if (*pinode == NULL) {

		cifs_fill_uniqueid(sb, &fattr);

		*pinode = cifs_iget(sb, &fattr);

		if (!*pinode) {

			rc = -ENOMEM;

			goto posix_open_ret;

		}

	} else {

		cifs_fattr_to_inode(*pinode, &fattr);

	}



posix_open_ret:

	kfree(presp_data);

	return rc;

}



static void setup_cifs_dentry(struct cifsTconInfo *tcon,

			      struct dentry *direntry,

			      struct inode *newinode)
@@ -321,9 +234,9 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode, 
		oplock = REQ_OPLOCK;



	if (nd && (nd->flags & LOOKUP_OPEN))

		oflags = nd->intent.open.flags;

		oflags = nd->intent.open.file->f_flags;

	else

		oflags = FMODE_READ | SMB_O_CREAT;

		oflags = O_RDONLY | O_CREAT;



	full_path = build_path_from_dentry(direntry);

	if (full_path == NULL) {
@@ -359,9 +272,9 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode, 
		/* if the file is going to stay open, then we

		   need to set the desired access properly */

		desiredAccess = 0;

		if (oflags & FMODE_READ)

		if (OPEN_FMODE(oflags) & FMODE_READ)

			desiredAccess |= GENERIC_READ; /* is this too little? */

		if (oflags & FMODE_WRITE)

		if (OPEN_FMODE(oflags) & FMODE_WRITE)

			desiredAccess |= GENERIC_WRITE;



		if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
@@ -716,11 +629,11 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, 
	if (pTcon->unix_ext) {

		if (nd && !(nd->flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY)) &&

		     (nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open &&

		     (nd->intent.open.flags & O_CREAT)) {

		     (nd->intent.open.file->f_flags & O_CREAT)) {

			rc = cifs_posix_open(full_path, &newInode,

					parent_dir_inode->i_sb,

					nd->intent.open.create_mode,

					nd->intent.open.flags, &oplock,

					nd->intent.open.file->f_flags, &oplock,

					&fileHandle, xid);

			/*

			 * The check below works around a bug in POSIX

fs/cifs/file.c

+88 −25
Original line number Diff line number Diff line
@@ -60,34 +60,32 @@ static inline int cifs_convert_flags(unsigned int flags) 
		FILE_READ_DATA);

}



static inline fmode_t cifs_posix_convert_flags(unsigned int flags)

static u32 cifs_posix_convert_flags(unsigned int flags)

{

	fmode_t posix_flags = 0;

	u32 posix_flags = 0;



	if ((flags & O_ACCMODE) == O_RDONLY)

		posix_flags = FMODE_READ;

		posix_flags = SMB_O_RDONLY;

	else if ((flags & O_ACCMODE) == O_WRONLY)

		posix_flags = FMODE_WRITE;

	else if ((flags & O_ACCMODE) == O_RDWR) {

		/* GENERIC_ALL is too much permission to request

		   can cause unnecessary access denied on create */

		/* return GENERIC_ALL; */

		posix_flags = FMODE_READ | FMODE_WRITE;

	}

	/* can not map O_CREAT or O_EXCL or O_TRUNC flags when

	   reopening a file.  They had their effect on the original open */

	if (flags & O_APPEND)

		posix_flags |= (fmode_t)O_APPEND;

		posix_flags = SMB_O_WRONLY;

	else if ((flags & O_ACCMODE) == O_RDWR)

		posix_flags = SMB_O_RDWR;



	if (flags & O_CREAT)

		posix_flags |= SMB_O_CREAT;

	if (flags & O_EXCL)

		posix_flags |= SMB_O_EXCL;

	if (flags & O_TRUNC)

		posix_flags |= SMB_O_TRUNC;

	/* be safe and imply O_SYNC for O_DSYNC */

	if (flags & O_DSYNC)

		posix_flags |= (fmode_t)O_DSYNC;

	if (flags & __O_SYNC)

		posix_flags |= (fmode_t)__O_SYNC;

		posix_flags |= SMB_O_SYNC;

	if (flags & O_DIRECTORY)

		posix_flags |= (fmode_t)O_DIRECTORY;

		posix_flags |= SMB_O_DIRECTORY;

	if (flags & O_NOFOLLOW)

		posix_flags |= (fmode_t)O_NOFOLLOW;

		posix_flags |= SMB_O_NOFOLLOW;

	if (flags & O_DIRECT)

		posix_flags |= (fmode_t)O_DIRECT;

		posix_flags |= SMB_O_DIRECT;



	return posix_flags;

}
@@ -159,6 +157,68 @@ client_can_cache: 
	return rc;

}



int cifs_posix_open(char *full_path, struct inode **pinode,

			struct super_block *sb, int mode, unsigned int f_flags,

			__u32 *poplock, __u16 *pnetfid, int xid)

{

	int rc;

	FILE_UNIX_BASIC_INFO *presp_data;

	__u32 posix_flags = 0;

	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);

	struct cifs_fattr fattr;

	struct tcon_link *tlink;

	struct cifsTconInfo *tcon;



	cFYI(1, "posix open %s", full_path);



	presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);

	if (presp_data == NULL)

		return -ENOMEM;



	tlink = cifs_sb_tlink(cifs_sb);

	if (IS_ERR(tlink)) {

		rc = PTR_ERR(tlink);

		goto posix_open_ret;

	}



	tcon = tlink_tcon(tlink);

	mode &= ~current_umask();



	posix_flags = cifs_posix_convert_flags(f_flags);

	rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,

			     poplock, full_path, cifs_sb->local_nls,

			     cifs_sb->mnt_cifs_flags &

					CIFS_MOUNT_MAP_SPECIAL_CHR);

	cifs_put_tlink(tlink);



	if (rc)

		goto posix_open_ret;



	if (presp_data->Type == cpu_to_le32(-1))

		goto posix_open_ret; /* open ok, caller does qpathinfo */



	if (!pinode)

		goto posix_open_ret; /* caller does not need info */



	cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);



	/* get new inode and set it up */

	if (*pinode == NULL) {

		cifs_fill_uniqueid(sb, &fattr);

		*pinode = cifs_iget(sb, &fattr);

		if (!*pinode) {

			rc = -ENOMEM;

			goto posix_open_ret;

		}

	} else {

		cifs_fattr_to_inode(*pinode, &fattr);

	}



posix_open_ret:

	kfree(presp_data);

	return rc;

}



int cifs_open(struct inode *inode, struct file *file)

{

	int rc = -EACCES;
@@ -205,12 +265,10 @@ int cifs_open(struct inode *inode, struct file *file) 
	    (tcon->ses->capabilities & CAP_UNIX) &&

	    (CIFS_UNIX_POSIX_PATH_OPS_CAP &

			le64_to_cpu(tcon->fsUnixInfo.Capability))) {

		int oflags = (int) cifs_posix_convert_flags(file->f_flags);

		oflags |= SMB_O_CREAT;

		/* can not refresh inode info since size could be stale */

		rc = cifs_posix_open(full_path, &inode, inode->i_sb,

				cifs_sb->mnt_file_mode /* ignored */,

				oflags, &oplock, &netfid, xid);

				file->f_flags, &oplock, &netfid, xid);

		if (rc == 0) {

			cFYI(1, "posix open succeeded");
@@ -426,8 +484,13 @@ reopen_error_exit: 
	if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&

	    (CIFS_UNIX_POSIX_PATH_OPS_CAP &

			le64_to_cpu(tcon->fsUnixInfo.Capability))) {

		int oflags = (int) cifs_posix_convert_flags(file->f_flags);

		/* can not refresh inode info since size could be stale */



		/*

		 * O_CREAT, O_EXCL and O_TRUNC already had their effect on the

		 * original open. Must mask them off for a reopen.

		 */

		unsigned int oflags = file->f_flags & ~(O_CREAT|O_EXCL|O_TRUNC);



		rc = cifs_posix_open(full_path, NULL, inode->i_sb,

				cifs_sb->mnt_file_mode /* ignored */,

				oflags, &oplock, &netfid, xid);

CRA Git | Maintained and supported by SUSTech CRA and CCSE