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authorWendy Cheng <wcheng@redhat.com>2008-01-17 11:10:12 -0500
committerJ. Bruce Fields <bfields@citi.umich.edu>2008-04-25 13:00:11 -0400
commit17efa372cfe4d189705edf6cd4fbe283827a5dc7 (patch)
treedcf10b96b079fff6edebbf451a32608ce6032663 /fs/nfsd/nfsctl.c
parent4373ea84c84d8a96e99d3da99e813d3e36d1bd11 (diff)
lockd: unlock lockd locks held for a certain filesystem
Add /proc/fs/nfsd/unlock_filesystem, which allows e.g.: shell> echo /mnt/sfs1 > /proc/fs/nfsd/unlock_filesystem so that a filesystem can be unmounted before allowing a peer nfsd to take over nfs service for the filesystem. Signed-off-by: S. Wendy Cheng <wcheng@redhat.com> Cc: Lon Hohberger <lhh@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> fs/lockd/svcsubs.c | 66 +++++++++++++++++++++++++++++++++++++++----- fs/nfsd/nfsctl.c | 65 +++++++++++++++++++++++++++++++++++++++++++ include/linux/lockd/lockd.h | 7 ++++ 3 files changed, 131 insertions(+), 7 deletions(-)
Diffstat (limited to 'fs/nfsd/nfsctl.c')
-rw-r--r--fs/nfsd/nfsctl.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 7706f6c9ab8..42f3820ee8f 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -56,6 +56,7 @@ enum {
NFSD_List,
NFSD_Fh,
NFSD_FO_UnlockIP,
+ NFSD_FO_UnlockFS,
NFSD_Threads,
NFSD_Pool_Threads,
NFSD_Versions,
@@ -93,6 +94,7 @@ static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
#endif
static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size);
+static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size);
static ssize_t (*write_op[])(struct file *, char *, size_t) = {
[NFSD_Svc] = write_svc,
@@ -104,6 +106,7 @@ static ssize_t (*write_op[])(struct file *, char *, size_t) = {
[NFSD_Getfs] = write_getfs,
[NFSD_Fh] = write_filehandle,
[NFSD_FO_UnlockIP] = failover_unlock_ip,
+ [NFSD_FO_UnlockFS] = failover_unlock_fs,
[NFSD_Threads] = write_threads,
[NFSD_Pool_Threads] = write_pool_threads,
[NFSD_Versions] = write_versions,
@@ -329,6 +332,33 @@ static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size)
return nlmsvc_unlock_all_by_ip(server_ip);
}
+static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size)
+{
+ struct nameidata nd;
+ char *fo_path;
+ int error;
+
+ /* sanity check */
+ if (size == 0)
+ return -EINVAL;
+
+ if (buf[size-1] != '\n')
+ return -EINVAL;
+
+ fo_path = buf;
+ if (qword_get(&buf, fo_path, size) < 0)
+ return -EINVAL;
+
+ error = path_lookup(fo_path, 0, &nd);
+ if (error)
+ return error;
+
+ error = nlmsvc_unlock_all_by_sb(nd.path.mnt->mnt_sb);
+
+ path_put(&nd.path);
+ return error;
+}
+
static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
{
/* request is:
@@ -733,6 +763,8 @@ static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
[NFSD_FO_UnlockIP] = {"unlock_ip",
&transaction_ops, S_IWUSR|S_IRUSR},
+ [NFSD_FO_UnlockFS] = {"unlock_filesystem",
+ &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},