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One more workaround for a missing NFS lock daemon.

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This commit is contained in:
Alexandre Julliard 2003-07-03 18:12:02 +00:00
parent fac288394a
commit b23aa94321
1 changed files with 15 additions and 3 deletions
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18
server/fd.c
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@ -67,6 +67,7 @@ struct fd
struct object *user; /* object using this file descriptor */
struct list locks; /* list of locks on this fd */
int unix_fd; /* unix file descriptor */
int fs_locks; /* can we use filesystem locks for this fd? */
int poll_index; /* index of fd in poll array */
};
@ -460,10 +461,11 @@ static int file_lock_signaled( struct object *obj, struct thread *thread )
}
/* set (or remove) a Unix lock if possible for the given range */
static int set_unix_lock( const struct fd *fd, file_pos_t start, file_pos_t end, int type )
static int set_unix_lock( struct fd *fd, file_pos_t start, file_pos_t end, int type )
{
struct flock fl;
if (!fd->fs_locks) return 1; /* no fs locks possible for this fd */
for (;;)
{
if (start == end) return 1; /* can't set zero-byte lock */
@ -477,11 +479,19 @@ static int set_unix_lock( const struct fd *fd, file_pos_t start, file_pos_t end,
switch(errno)
{
case EACCES:
/* check whether locks work at all on this file system */
if (fcntl( fd->unix_fd, F_GETLK, &fl ) != -1)
{
set_error( STATUS_FILE_LOCK_CONFLICT );
return 0;
}
/* fall through */
case EIO:
case ENOLCK:
/* no locking on this fs, just ignore it */
fd->fs_locks = 0;
return 1;
case EACCES:
case EAGAIN:
set_error( STATUS_FILE_LOCK_CONFLICT );
return 0;
@ -517,7 +527,7 @@ inline static int lock_overlaps( struct file_lock *lock, file_pos_t start, file_
}
/* remove Unix locks for all bytes in the specified area that are no longer locked */
static void remove_unix_locks( const struct fd *fd, file_pos_t start, file_pos_t end )
static void remove_unix_locks( struct fd *fd, file_pos_t start, file_pos_t end )
{
struct hole
{
@ -531,6 +541,7 @@ static void remove_unix_locks( const struct fd *fd, file_pos_t start, file_pos_t
int count = 0;
if (!fd->inode) return;
if (!fd->fs_locks) return;
if (start == end || start > max_unix_offset) return;
if (!end || end > max_unix_offset) end = max_unix_offset + 1;
@ -805,6 +816,7 @@ struct fd *alloc_fd( const struct fd_ops *fd_user_ops, struct object *user )
fd->inode = NULL;
fd->closed = NULL;
fd->unix_fd = -1;
fd->fs_locks = 1;
fd->poll_index = -1;
list_init( &fd->inode_entry );
list_init( &fd->locks );