diff options
author | Jeff Layton <jlayton@redhat.com> | 2010-09-29 19:51:11 -0400 |
---|---|---|
committer | Steve French <sfrench@us.ibm.com> | 2010-10-06 16:12:44 +0000 |
commit | 7ffec372458d163492e56e663a1b3a2d7be0a0a2 (patch) | |
tree | e404e3d1000ff41e9b27d0ecb4d6a47187e110d7 /fs/cifs/cifsglob.h | |
parent | f3983c2133e9bea9c8b4f690737d15e3e9b02491 (diff) |
cifs: add refcounted and timestamped container for holding tcons
Eventually, we'll need to track the use of tcons on a per-sb basis, so that
we know when it's ok to tear them down. Begin this conversion by adding a
new "tcon_link" struct and accessors that get it. For now, the core data
structures are untouched -- cifs_sb still just points to a single tcon and
the pointers are just cast to deal with the accessor functions. A later
patch will flesh this out.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/cifsglob.h')
-rw-r--r-- | fs/cifs/cifsglob.h | 51 |
1 files changed, 38 insertions, 13 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index c265ebdcd17..cdfd2db4e70 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -311,6 +311,44 @@ struct cifsTconInfo { }; /* + * This is a refcounted and timestamped container for a tcon pointer. The + * container holds a tcon reference. It is considered safe to free one of + * these when the tl_count goes to 0. The tl_time is the time of the last + * "get" on the container. + */ +struct tcon_link { + spinlock_t tl_lock; + u32 tl_count; + u64 tl_time; + struct cifsTconInfo *tl_tcon; +}; + +static inline struct tcon_link * +cifs_sb_tlink(struct cifs_sb_info *cifs_sb) +{ + return (struct tcon_link *)cifs_sb->ptcon; +} + +static inline struct cifsTconInfo * +tlink_tcon(struct tcon_link *tlink) +{ + return (struct cifsTconInfo *)tlink; +} + +static inline void +cifs_put_tlink(struct tcon_link *tlink) +{ + return; +} + +/* This function is always expected to succeed */ +static inline struct cifsTconInfo * +cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb) +{ + return cifs_sb->ptcon; +} + +/* * This info hangs off the cifsFileInfo structure, pointed to by llist. * This is used to track byte stream locks on the file */ @@ -413,19 +451,6 @@ CIFS_SB(struct super_block *sb) return sb->s_fs_info; } -static inline struct cifsTconInfo * -cifs_sb_tcon(struct cifs_sb_info *cifs_sb) -{ - return cifs_sb->ptcon; -} - -/* This function is always expected to succeed */ -static inline struct cifsTconInfo * -cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb) -{ - return cifs_sb->ptcon; -} - static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb) { if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) |