d7c86ff8cd
Filesystems aren't really supposed to do anything with a vfsmount. It's considered a layering violation since vfsmounts are entirely managed at the VFS layer. CIFS currently keeps an active reference to a vfsmount in order to prevent the superblock vanishing before an oplock break has completed. What we really want to do instead is to keep sb->s_active high until the oplock break has completed. This patch borrows the scheme that NFS uses for handling sillyrenames. An atomic_t is added to the cifs_sb_info. When it transitions from 0 to 1, an extra reference to the superblock is taken (by bumping the s_active value). When it transitions from 1 to 0, that reference is dropped and a the superblock teardown may proceed if there are no more references to it. Also, the vfsmount pointer is removed from cifsFileInfo and from cifs_new_fileinfo, and some bogus forward declarations are removed from cifsfs.h. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Acked-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
66 lines
2.8 KiB
C
66 lines
2.8 KiB
C
/*
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* fs/cifs/cifs_fs_sb.h
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*
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* Copyright (c) International Business Machines Corp., 2002,2004
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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*/
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#include <linux/radix-tree.h>
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#ifndef _CIFS_FS_SB_H
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#define _CIFS_FS_SB_H
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#include <linux/backing-dev.h>
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#define CIFS_MOUNT_NO_PERM 1 /* do not do client vfs_perm check */
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#define CIFS_MOUNT_SET_UID 2 /* set current's euid in create etc. */
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#define CIFS_MOUNT_SERVER_INUM 4 /* inode numbers from uniqueid from server */
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#define CIFS_MOUNT_DIRECT_IO 8 /* do not write nor read through page cache */
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#define CIFS_MOUNT_NO_XATTR 0x10 /* if set - disable xattr support */
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#define CIFS_MOUNT_MAP_SPECIAL_CHR 0x20 /* remap illegal chars in filenames */
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#define CIFS_MOUNT_POSIX_PATHS 0x40 /* Negotiate posix pathnames if possible*/
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#define CIFS_MOUNT_UNX_EMUL 0x80 /* Network compat with SFUnix emulation */
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#define CIFS_MOUNT_NO_BRL 0x100 /* No sending byte range locks to srv */
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#define CIFS_MOUNT_CIFS_ACL 0x200 /* send ACL requests to non-POSIX srv */
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#define CIFS_MOUNT_OVERR_UID 0x400 /* override uid returned from server */
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#define CIFS_MOUNT_OVERR_GID 0x800 /* override gid returned from server */
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#define CIFS_MOUNT_DYNPERM 0x1000 /* allow in-memory only mode setting */
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#define CIFS_MOUNT_NOPOSIXBRL 0x2000 /* mandatory not posix byte range lock */
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#define CIFS_MOUNT_NOSSYNC 0x4000 /* don't do slow SMBflush on every sync*/
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#define CIFS_MOUNT_FSCACHE 0x8000 /* local caching enabled */
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#define CIFS_MOUNT_MF_SYMLINKS 0x10000 /* Minshall+French Symlinks enabled */
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#define CIFS_MOUNT_MULTIUSER 0x20000 /* multiuser mount */
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struct cifs_sb_info {
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struct radix_tree_root tlink_tree;
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#define CIFS_TLINK_MASTER_TAG 0 /* is "master" (mount) tcon */
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spinlock_t tlink_tree_lock;
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struct nls_table *local_nls;
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unsigned int rsize;
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unsigned int wsize;
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atomic_t active;
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uid_t mnt_uid;
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gid_t mnt_gid;
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mode_t mnt_file_mode;
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mode_t mnt_dir_mode;
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unsigned int mnt_cifs_flags;
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int prepathlen;
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char *prepath; /* relative path under the share to mount to */
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#ifdef CONFIG_CIFS_DFS_UPCALL
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char *mountdata; /* mount options received at mount time */
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#endif
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struct backing_dev_info bdi;
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struct delayed_work prune_tlinks;
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};
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#endif /* _CIFS_FS_SB_H */
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