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authorMarc Eshel <eshel@almaden.ibm.com>2007-01-15 18:33:36 -0500
committerJ. Bruce Fields <bfields@citi.umich.edu>2007-07-18 19:17:19 -0400
commit60446067ba7a8e890a91db3b4a7436fe0ebd2dee (patch)
tree17ce000f5f70ef7f53a94ce594d15f10fa964cd0
parent4698afe8e3a725576366f86560a8a8242b21b9f7 (diff)
gfs2: stop giving out non-cluster-coherent leases
Since gfs2 can't prevent conflicting opens or leases on other nodes, we probably shouldn't allow it to give out leases at all. Put the newly defined lease operation into use in gfs2 by turning off lease, unless we're using the "nolock' locking module (in which case all locking is local anyway). Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Cc: Steven Whitehouse <swhiteho@redhat.com>
-rw-r--r--fs/gfs2/ops_file.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c
index 196d83266e3..1a5e8e893d7 100644
--- a/fs/gfs2/ops_file.c
+++ b/fs/gfs2/ops_file.c
@@ -489,6 +489,29 @@ static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
}
/**
+ * gfs2_setlease - acquire/release a file lease
+ * @file: the file pointer
+ * @arg: lease type
+ * @fl: file lock
+ *
+ * Returns: errno
+ */
+
+static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
+
+ /*
+ * We don't currently have a way to enforce a lease across the whole
+ * cluster; until we do, disable leases (by just returning -EINVAL),
+ * unless the administrator has requested purely local locking.
+ */
+ if (!sdp->sd_args.ar_localflocks)
+ return -EINVAL;
+ return setlease(file, arg, fl);
+}
+
+/**
* gfs2_lock - acquire/release a posix lock on a file
* @file: the file pointer
* @cmd: either modify or retrieve lock state, possibly wait
@@ -638,6 +661,7 @@ const struct file_operations gfs2_file_fops = {
.flock = gfs2_flock,
.splice_read = generic_file_splice_read,
.splice_write = generic_file_splice_write,
+ .setlease = gfs2_setlease,
};
const struct file_operations gfs2_dir_fops = {