From: Peter Staubach Allow file systems to inform the file system independent layers that they don't support file leases. The problem is that some file system such as NFSv2 and NFSv3 do not have sufficient support to be able to support leases correctly. In particular for these two file systems, there is no over the wire protocol support. Currently, these two file systems fail the fcntl(F_SETLEASE) call accidently, due to a reference counting difference. These file systems should fail more consciously, with a proper error to indicate that the call is invalid for them. Cc: Trond Myklebust Signed-off-by: Andrew Morton --- fs/locks.c | 2 ++ fs/nfs/super.c | 2 ++ include/linux/fs.h | 2 ++ 3 files changed, 6 insertions(+) diff -puN fs/locks.c~allow-file-system-to-configure-for-no-leases fs/locks.c --- a/fs/locks.c~allow-file-system-to-configure-for-no-leases +++ a/fs/locks.c @@ -1477,6 +1477,8 @@ int fcntl_setlease(unsigned int fd, stru error = security_file_lock(filp, arg); if (error) return error; + if (IS_NO_LEASES(inode)) + return -EINVAL; locks_init_lock(&fl); error = lease_init(filp, arg, &fl); diff -puN fs/nfs/super.c~allow-file-system-to-configure-for-no-leases fs/nfs/super.c --- a/fs/nfs/super.c~allow-file-system-to-configure-for-no-leases +++ a/fs/nfs/super.c @@ -545,6 +545,8 @@ static inline void nfs_initialise_sb(str sb->s_magic = NFS_SUPER_MAGIC; + sb->s_flags |= MS_NO_LEASES; + /* We probably want something more informative here */ snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); diff -puN include/linux/fs.h~allow-file-system-to-configure-for-no-leases include/linux/fs.h --- a/include/linux/fs.h~allow-file-system-to-configure-for-no-leases +++ a/include/linux/fs.h @@ -123,6 +123,7 @@ extern int dir_notify_enable; #define MS_SLAVE (1<<19) /* change to slave */ #define MS_SHARED (1<<20) /* change to shared */ #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ +#define MS_NO_LEASES (1<<22) /* fs does not support leases */ #define MS_ACTIVE (1<<30) #define MS_NOUSER (1<<31) @@ -182,6 +183,7 @@ extern int dir_notify_enable; #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) +#define IS_NO_LEASES(inode) __IS_FLG(inode, MS_NO_LEASES) /* the read-only stuff doesn't really belong here, but any other place is probably as bad and I don't want to create yet another include file. */ _