6d20e8406f
Currently, the attribute cache timeout for CIFS is hardcoded to 1 second. This means that the client might have to issue a QPATHINFO/QFILEINFO call every 1 second to verify if something has changes, which seems too expensive. On the other hand, if the timeout is hardcoded to a higher value, workloads that expect strict cache coherency might see unexpected results. Making attribute cache timeout as a tunable will allow us to make a tradeoff between performance and cache metadata correctness depending on the application/workload needs. Add 'actimeo' tunable that can be used to tune the attribute cache timeout. The default timeout is set to 1 second. Also, display actimeo option value in /proc/mounts. It appears to me that 'actimeo' and the proposed (but not yet merged) 'strictcache' option cannot coexist, so care must be taken that we reset the other option if one of them is set. Changes since last post: - fix option parsing and handle possible values correcly Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
67 lines
2.8 KiB
C
67 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/rbtree.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 rb_root tlink_tree;
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spinlock_t tlink_tree_lock;
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struct tcon_link *master_tlink;
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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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unsigned long actimeo; /* attribute cache timeout (jiffies) */
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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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