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Commit 2c6292ae authored by Al Viro's avatar Al Viro
Browse files

cifs: don't pass superblock to cifs_mount() 



To close sget() races we'll need to be able to set cifs_sb up before
we get the superblock, so we'll want to be able to do cifs_mount()
earlier.  Fortunately, it's easy to do - setting ->s_maxbytes can
be done in cifs_read_super(), ditto for ->s_time_gran and as for
putting MS_POSIXACL into ->s_flags, we can mirror it in ->mnt_cifs_flags
until cifs_read_super() is called.  Kill unused 'devname' argument,
while we are at it...

Acked-by: default avatarPavel Shilovsky <piastryyy@gmail.com>
Reviewed-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent ca171baa

fs/cifs/cifs_fs_sb.h

+1 −0
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ 
#define CIFS_MOUNT_MULTIUSER	0x20000 /* multiuser mount */

#define CIFS_MOUNT_STRICT_IO	0x40000 /* strict cache mode */

#define CIFS_MOUNT_RWPIDFORWARD	0x80000 /* use pid forwarding for rw */

#define CIFS_MOUNT_POSIXACL	0x100000 /* mirror of MS_POSIXACL in mnt_cifs_flags */



struct cifs_sb_info {

	struct rb_root tlink_tree;

fs/cifs/cifsfs.c

+12 −1
Original line number Diff line number Diff line
@@ -116,7 +116,7 @@ cifs_read_super(struct super_block *sb, struct smb_vol *volume_info, 
	spin_lock_init(&cifs_sb->tlink_tree_lock);

	cifs_sb->tlink_tree = RB_ROOT;



	rc = cifs_mount(sb, cifs_sb, volume_info, devname);

	rc = cifs_mount(cifs_sb, volume_info);



	if (rc) {

		if (!silent)
@@ -124,6 +124,17 @@ cifs_read_super(struct super_block *sb, struct smb_vol *volume_info, 
		return rc;

	}



	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)

		sb->s_flags |= MS_POSIXACL;



	if (cifs_sb_master_tcon(cifs_sb)->ses->capabilities & CAP_LARGE_FILES)

		sb->s_maxbytes = MAX_LFS_FILESIZE;

	else

		sb->s_maxbytes = MAX_NON_LFS;



	/* BB FIXME fix time_gran to be larger for LANMAN sessions */

	sb->s_time_gran = 100;



	sb->s_magic = CIFS_MAGIC_NUMBER;

	sb->s_op = &cifs_super_ops;

	sb->s_bdi = &cifs_sb->bdi;

fs/cifs/cifsproto.h

+3 −3
Original line number Diff line number Diff line
@@ -157,8 +157,7 @@ extern int cifs_match_super(struct super_block *, void *); 
extern void cifs_cleanup_volume_info(struct smb_vol **pvolume_info);

extern int cifs_setup_volume_info(struct smb_vol **pvolume_info,

				  char *mount_data, const char *devname);

extern int cifs_mount(struct super_block *, struct cifs_sb_info *,

		      struct smb_vol *, const char *);

extern int cifs_mount(struct cifs_sb_info *, struct smb_vol *);

extern int cifs_umount(struct super_block *, struct cifs_sb_info *);

extern void cifs_dfs_release_automount_timer(void);

void cifs_proc_init(void);
@@ -218,7 +217,8 @@ extern int get_dfs_path(int xid, struct cifs_ses *pSesInfo, 
			struct dfs_info3_param **preferrals,

			int remap);

extern void reset_cifs_unix_caps(int xid, struct cifs_tcon *tcon,

				 struct super_block *sb, struct smb_vol *vol);

				 struct cifs_sb_info *cifs_sb,

				 struct smb_vol *vol);

extern int CIFSSMBQFSInfo(const int xid, struct cifs_tcon *tcon,

			struct kstatfs *FSData);

extern int SMBOldQFSInfo(const int xid, struct cifs_tcon *tcon,

fs/cifs/connect.c

+10 −18
Original line number Diff line number Diff line
@@ -2546,7 +2546,7 @@ ip_connect(struct TCP_Server_Info *server) 
}



void reset_cifs_unix_caps(int xid, struct cifs_tcon *tcon,

			  struct super_block *sb, struct smb_vol *vol_info)

			  struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)

{

	/* if we are reconnecting then should we check to see if

	 * any requested capabilities changed locally e.g. via
@@ -2600,22 +2600,23 @@ void reset_cifs_unix_caps(int xid, struct cifs_tcon *tcon, 
			cap &= ~CIFS_UNIX_POSIX_ACL_CAP;

		else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {

			cFYI(1, "negotiated posix acl support");

			if (sb)

				sb->s_flags |= MS_POSIXACL;

			if (cifs_sb)

				cifs_sb->mnt_cifs_flags |=

					CIFS_MOUNT_POSIXACL;

		}



		if (vol_info && vol_info->posix_paths == 0)

			cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;

		else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {

			cFYI(1, "negotiate posix pathnames");

			if (sb)

				CIFS_SB(sb)->mnt_cifs_flags |=

			if (cifs_sb)

				cifs_sb->mnt_cifs_flags |=

					CIFS_MOUNT_POSIX_PATHS;

		}



		if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {

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

			if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {

				CIFS_SB(sb)->rsize = 127 * 1024;

				cifs_sb->rsize = 127 * 1024;

				cFYI(DBG2, "larger reads not supported by srv");

			}

		}
@@ -2971,8 +2972,7 @@ int cifs_setup_volume_info(struct smb_vol **pvolume_info, char *mount_data, 
}



int

cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,

	   struct smb_vol *volume_info, const char *devname)

cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)

{

	int rc = 0;

	int xid;
@@ -3026,14 +3026,6 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb, 
		goto mount_fail_check;

	}



	if (pSesInfo->capabilities & CAP_LARGE_FILES)

		sb->s_maxbytes = MAX_LFS_FILESIZE;

	else

		sb->s_maxbytes = MAX_NON_LFS;



	/* BB FIXME fix time_gran to be larger for LANMAN sessions */

	sb->s_time_gran = 100;



	/* search for existing tcon to this server share */

	tcon = cifs_get_tcon(pSesInfo, volume_info);

	if (IS_ERR(tcon)) {
@@ -3046,7 +3038,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb, 
	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);

		reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);

		if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&

		    (le64_to_cpu(tcon->fsUnixInfo.Capability) &

		     CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {