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server: Reuse existing file descriptor objects for duplicate file mappings.

This commit is contained in:
Alexandre Julliard 2011-04-19 17:19:31 +02:00
parent 55bfd2ef0d
commit 200f8d958f
3 changed files with 22 additions and 4 deletions
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14
server/fd.c
View File

@ -1670,6 +1670,20 @@ failed:
return NULL;
}
/* find an existing fd object that can be reused for a mapping */
struct fd *get_fd_object_for_mapping( struct fd *fd, unsigned int access, unsigned int sharing )
{
struct fd *fd_ptr;
if (!fd->inode) return NULL;
LIST_FOR_EACH_ENTRY( fd_ptr, &fd->inode->open, struct fd, inode_entry )
if (fd_ptr->access == access && fd_ptr->sharing == sharing)
return (struct fd *)grab_object( fd_ptr );
return NULL;
}
/* set the status to return when the fd has no associated unix fd */
void set_no_fd_status( struct fd *fd, unsigned int status )
{

1
server/file.h
View File

@ -61,6 +61,7 @@ extern struct fd *create_anonymous_fd( const struct fd_ops *fd_user_ops,
int unix_fd, struct object *user, unsigned int options );
extern struct fd *dup_fd_object( struct fd *orig, unsigned int access, unsigned int sharing,
unsigned int options );
extern struct fd *get_fd_object_for_mapping( struct fd *fd, unsigned int access, unsigned int sharing );
extern void *get_fd_user( struct fd *fd );
extern void set_fd_user( struct fd *fd, const struct fd_ops *ops, struct object *user );
extern unsigned int get_fd_options( struct fd *fd );

11
server/mapping.c
View File

@ -496,6 +496,7 @@ static struct object *create_mapping( struct directory *root, const struct unico
if (handle)
{
const unsigned int sharing = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
unsigned int mapping_access = FILE_MAPPING_ACCESS;
if (!(protect & VPROT_COMMITTED))
@ -509,14 +510,16 @@ static struct object *create_mapping( struct directory *root, const struct unico
/* file sharing rules for mappings are different so we use magic the access rights */
if (protect & VPROT_IMAGE) mapping_access |= FILE_MAPPING_IMAGE;
else if (protect & VPROT_WRITE) mapping_access |= FILE_MAPPING_WRITE;
mapping->fd = dup_fd_object( fd, mapping_access,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
FILE_SYNCHRONOUS_IO_NONALERT );
if (!(mapping->fd = get_fd_object_for_mapping( fd, mapping_access, sharing )))
{
mapping->fd = dup_fd_object( fd, mapping_access, sharing, FILE_SYNCHRONOUS_IO_NONALERT );
if (mapping->fd) set_fd_user( mapping->fd, &mapping_fd_ops, NULL );
}
release_object( file );
release_object( fd );
if (!mapping->fd) goto error;
set_fd_user( mapping->fd, &mapping_fd_ops, &mapping->obj );
if ((unix_fd = get_unix_fd( mapping->fd )) == -1) goto error;
if (protect & VPROT_IMAGE)
{