From 17efa372cfe4d189705edf6cd4fbe283827a5dc7 Mon Sep 17 00:00:00 2001 From: Wendy Cheng Date: Thu, 17 Jan 2008 11:10:12 -0500 Subject: 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 Cc: Lon Hohberger Cc: Christoph Hellwig Signed-off-by: J. Bruce Fields fs/lockd/svcsubs.c | 66 +++++++++++++++++++++++++++++++++++++++----- fs/nfsd/nfsctl.c | 65 +++++++++++++++++++++++++++++++++++++++++++ include/linux/lockd/lockd.h | 7 ++++ 3 files changed, 131 insertions(+), 7 deletions(-) --- fs/nfsd/nfsctl.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'fs/nfsd') diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index 7706f6c9ab8a..42f3820ee8f5 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}, -- cgit v1.2.3