xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ocfs2: POSIX file locks support

Browse Source 
This is actually pretty easy since fs/dlm already handles the bulk of the
work. The Ocfs2 userspace cluster stack module already uses fs/dlm as the
underlying lock manager, so I only had to add the right calls.

Cluster-aware POSIX locks ("plocks") can be turned off by the same means at
UNIX locks - mount with 'noflocks', or create a local-only Ocfs2 volume.
Internally, the file system uses two sets of file_operations, depending on
whether cluster aware plocks is required. This turns out to be easier than
implementing local-only versions of ->lock.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Mark Fasheh
2008-07-21 14:29:16 -07:00
parent a447c09324
commit 53da4939f3
8 changed files with 155 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
fs/ocfs2/stackglue.c
View File

@@ -288,6 +288,26 @@ void ocfs2_dlm_dump_lksb(union ocfs2_dlm_lksb *lksb)
}
EXPORT_SYMBOL_GPL(ocfs2_dlm_dump_lksb);
int ocfs2_stack_supports_plocks(void)
{
return !!(active_stack && active_stack->sp_ops->plock);
}
EXPORT_SYMBOL_GPL(ocfs2_stack_supports_plocks);
/*
* ocfs2_plock() can only be safely called if
* ocfs2_stack_supports_plocks() returned true
*/
int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino,
struct file *file, int cmd, struct file_lock *fl)
{
WARN_ON_ONCE(active_stack->sp_ops->plock == NULL);
if (active_stack->sp_ops->plock)
return active_stack->sp_ops->plock(conn, ino, file, cmd, fl);
return -EOPNOTSUPP;
}
EXPORT_SYMBOL_GPL(ocfs2_plock);
int ocfs2_cluster_connect(const char *stack_name,
const char *group,
int grouplen,