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author | Mark Fasheh <mfasheh@suse.com> | 2008-07-22 01:29:16 +0400 |
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committer | Mark Fasheh <mfasheh@suse.com> | 2008-10-14 00:57:57 +0400 |
commit | 53da4939f349d4edd283b043219221ca5b78e4d4 (patch) | |
tree | 3e0f8e1bd5474822431cffd1e449df9b639e1772 /fs/ocfs2/stackglue.h | |
parent | a447c0932445f92ce6f4c1bd020f62c5097a7842 (diff) | |
download | linux-53da4939f349d4edd283b043219221ca5b78e4d4.tar.xz |
ocfs2: POSIX file locks support
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>
Diffstat (limited to 'fs/ocfs2/stackglue.h')
-rw-r--r-- | fs/ocfs2/stackglue.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/fs/ocfs2/stackglue.h b/fs/ocfs2/stackglue.h index db56281dd1be..c571af375ef8 100644 --- a/fs/ocfs2/stackglue.h +++ b/fs/ocfs2/stackglue.h @@ -28,6 +28,10 @@ #include "dlm/dlmapi.h" #include <linux/dlm.h> +/* Needed for plock-related prototypes */ +struct file; +struct file_lock; + /* * dlmconstants.h does not have a LOCAL flag. We hope to remove it * some day, but right now we need it. Let's fake it. This value is larger @@ -187,6 +191,17 @@ struct ocfs2_stack_operations { void *(*lock_lvb)(union ocfs2_dlm_lksb *lksb); /* + * Cluster-aware posix locks + * + * This is NULL for stacks which do not support posix locks. + */ + int (*plock)(struct ocfs2_cluster_connection *conn, + u64 ino, + struct file *file, + int cmd, + struct file_lock *fl); + + /* * This is an optoinal debugging hook. If provided, the * stack can dump debugging information about this lock. */ @@ -240,6 +255,10 @@ int ocfs2_dlm_lock_status(union ocfs2_dlm_lksb *lksb); void *ocfs2_dlm_lvb(union ocfs2_dlm_lksb *lksb); void ocfs2_dlm_dump_lksb(union ocfs2_dlm_lksb *lksb); +int ocfs2_stack_supports_plocks(void); +int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino, + struct file *file, int cmd, struct file_lock *fl); + void ocfs2_stack_glue_set_locking_protocol(struct ocfs2_locking_protocol *proto); |