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Commit 724d9f1c authored by Pavel Shilovsky's avatar Pavel Shilovsky Committed by Steve French
Browse files

CIFS: Simplify mount code for further shared sb capability 



Reorganize code to get mount option at first and when get a superblock.
This lets us use shared superblock model further for equal mounts.

Signed-off-by: default avatarPavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
parent 37bb04e5

fs/cifs/cifsfs.c

+57 −31
Original line number Diff line number Diff line
@@ -104,19 +104,16 @@ cifs_sb_deactive(struct super_block *sb) 
}



static int

cifs_read_super(struct super_block *sb, void *data,

		const char *devname, int silent)

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

		void *data, struct smb_vol *volume_info, const char *devname,

		int silent)

{

	struct inode *inode;

	struct cifs_sb_info *cifs_sb;

	int rc = 0;



	/* BB should we make this contingent on mount parm? */

	sb->s_flags |= MS_NODIRATIME | MS_NOATIME;

	sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);

	cifs_sb = CIFS_SB(sb);

	if (cifs_sb == NULL)

		return -ENOMEM;

	sb->s_fs_info = cifs_sb;



	spin_lock_init(&cifs_sb->tlink_tree_lock);

	cifs_sb->tlink_tree = RB_ROOT;
@@ -128,22 +125,10 @@ cifs_read_super(struct super_block *sb, void *data, 
	}

	cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages;



	/*

	 * Copy mount params to sb for use in submounts. Better to do

	 * the copy here and deal with the error before cleanup gets

	 * complicated post-mount.

	 */

	if (data) {

		cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);

		if (cifs_sb->mountdata == NULL) {

			bdi_destroy(&cifs_sb->bdi);

			kfree(sb->s_fs_info);

			sb->s_fs_info = NULL;

			return -ENOMEM;

		}

	}

	if (data)

		cifs_sb->mountdata = data;



	rc = cifs_mount(sb, cifs_sb, devname);

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



	if (rc) {

		if (!silent)
@@ -565,23 +550,64 @@ cifs_do_mount(struct file_system_type *fs_type, 
{

	int rc;

	struct super_block *sb;



	sb = sget(fs_type, NULL, set_anon_super, NULL);

	struct cifs_sb_info *cifs_sb;

	struct smb_vol *volume_info;

	struct dentry *root;

	char *copied_data = NULL;



	cFYI(1, "Devname: %s flags: %d ", dev_name, flags);



	if (IS_ERR(sb))

		return ERR_CAST(sb);

	rc = cifs_setup_volume_info(&volume_info, (char *)data, dev_name);

	if (rc)

		return ERR_PTR(rc);



	cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);

	if (cifs_sb == NULL) {

		root = ERR_PTR(-ENOMEM);

		goto out;

	}



	cifs_setup_cifs_sb(volume_info, cifs_sb);



	sb = sget(fs_type, NULL, set_anon_super, NULL);

	if (IS_ERR(sb)) {

		kfree(cifs_sb);

		root = ERR_CAST(sb);

		goto out;

	}



	sb->s_flags = flags;



	rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);

	/*

	 * Copy mount params for use in submounts. Better to do

	 * the copy here and deal with the error before cleanup gets

	 * complicated post-mount.

	 */

	copied_data = kstrndup(data, PAGE_SIZE, GFP_KERNEL);

	if (copied_data == NULL) {

		root = ERR_PTR(-ENOMEM);

		goto err_out;

	}



	rc = cifs_read_super(sb, cifs_sb, copied_data, volume_info, dev_name,

			     flags & MS_SILENT ? 1 : 0);

	if (rc) {

		deactivate_locked_super(sb);

		return ERR_PTR(rc);

		root = ERR_PTR(rc);

		goto err_out;

	}



	sb->s_flags |= MS_ACTIVE;

	return dget(sb->s_root);



	root = dget(sb->s_root);

out:

	cifs_cleanup_volume_info(&volume_info);

	return root;



err_out:

	kfree(cifs_sb);

	deactivate_locked_super(sb);

	cifs_cleanup_volume_info(&volume_info);

	return root;

}



static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,

fs/cifs/cifsproto.h

+7 −1
Original line number Diff line number Diff line
@@ -150,8 +150,14 @@ extern struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *, struct inode *, 
extern int set_cifs_acl(struct cifs_ntsd *, __u32, struct inode *,

				const char *);



extern void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,

			       struct cifs_sb_info *cifs_sb);

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 *,

			const char *);

		      struct smb_vol *, const char *);

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

extern void cifs_dfs_release_automount_timer(void);

void cifs_proc_init(void);

fs/cifs/connect.c

+50 −39
Original line number Diff line number Diff line
@@ -2614,7 +2614,7 @@ convert_delimiter(char *path, char delim) 
	}

}



static void setup_cifs_sb(struct smb_vol *pvolume_info,

void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,

			struct cifs_sb_info *cifs_sb)

{

	INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
@@ -2671,6 +2671,7 @@ static void setup_cifs_sb(struct smb_vol *pvolume_info, 
		cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);



	cifs_sb->actimeo = pvolume_info->actimeo;

	cifs_sb->local_nls = pvolume_info->local_nls;



	if (pvolume_info->noperm)

		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
@@ -2747,8 +2748,8 @@ is_path_accessible(int xid, struct cifsTconInfo *tcon, 
	return rc;

}



static void

cleanup_volume_info(struct smb_vol **pvolume_info)

void

cifs_cleanup_volume_info(struct smb_vol **pvolume_info)

{

	struct smb_vol *volume_info;
@@ -2854,40 +2855,13 @@ expand_dfs_referral(int xid, struct cifsSesInfo *pSesInfo, 
}

#endif



int

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

int cifs_setup_volume_info(struct smb_vol **pvolume_info, char *mount_data,

			   const char *devname)

{

	int rc;

	int xid;

	struct smb_vol *volume_info;

	struct cifsSesInfo *pSesInfo;

	struct cifsTconInfo *tcon;

	struct TCP_Server_Info *srvTcp;

	char   *full_path;

	struct tcon_link *tlink;

#ifdef CONFIG_CIFS_DFS_UPCALL

	int referral_walks_count = 0;

try_mount_again:

	/* cleanup activities if we're chasing a referral */

	if (referral_walks_count) {

		if (tcon)

			cifs_put_tcon(tcon);

		else if (pSesInfo)

			cifs_put_smb_ses(pSesInfo);



		cleanup_volume_info(&volume_info);

		FreeXid(xid);

	}

#endif

	rc = 0;

	tcon = NULL;

	pSesInfo = NULL;

	srvTcp = NULL;

	full_path = NULL;

	tlink = NULL;

	int rc = 0;



	xid = GetXid();

	*pvolume_info = NULL;



	volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);

	if (!volume_info) {
@@ -2895,7 +2869,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb, 
		goto out;

	}



	if (cifs_parse_mount_options(cifs_sb->mountdata, devname,

	if (cifs_parse_mount_options(mount_data, devname,

				     volume_info)) {

		rc = -EINVAL;

		goto out;
@@ -2928,7 +2902,46 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb, 
			goto out;

		}

	}

	cifs_sb->local_nls = volume_info->local_nls;



	*pvolume_info = volume_info;

	return rc;

out:

	cifs_cleanup_volume_info(&volume_info);

	return rc;

}



int

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

	   struct smb_vol *volume_info, const char *devname)

{

	int rc = 0;

	int xid;

	struct cifsSesInfo *pSesInfo;

	struct cifsTconInfo *tcon;

	struct TCP_Server_Info *srvTcp;

	char   *full_path;

	struct tcon_link *tlink;

#ifdef CONFIG_CIFS_DFS_UPCALL

	int referral_walks_count = 0;

try_mount_again:

	/* cleanup activities if we're chasing a referral */

	if (referral_walks_count) {

		if (tcon)

			cifs_put_tcon(tcon);

		else if (pSesInfo)

			cifs_put_smb_ses(pSesInfo);



		cifs_cleanup_volume_info(&volume_info);

		FreeXid(xid);

	}

#endif

	tcon = NULL;

	pSesInfo = NULL;

	srvTcp = NULL;

	full_path = NULL;

	tlink = NULL;



	xid = GetXid();



	/* get a reference to a tcp session */

	srvTcp = cifs_get_tcp_session(volume_info);
@@ -2945,7 +2958,6 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb, 
		goto mount_fail_check;

	}



	setup_cifs_sb(volume_info, cifs_sb);

	if (pSesInfo->capabilities & CAP_LARGE_FILES)

		sb->s_maxbytes = MAX_LFS_FILESIZE;

	else
@@ -3101,7 +3113,6 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb, 
	password will be freed at unmount time) */

out:

	/* zero out password before freeing */

	cleanup_volume_info(&volume_info);

	FreeXid(xid);

	return rc;

}