ReceiveTempSMS
/
Sweden-Number
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

server: Use the file descriptor instead of the file object where possible in memory mappings.

This commit is contained in:
Alexandre Julliard 2009-11-23 16:03:37 +01:00
parent d57692d86b
commit 0f4068ac6f
1 changed files with 18 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
server/mapping.c
View File

@ -128,14 +128,11 @@ static void init_page_size(void)
/* extend a file beyond the current end of file */
static int extend_file( struct file *file, file_pos_t new_size )
static int grow_file( int unix_fd, file_pos_t new_size )
{
static const char zero;
int unix_fd = get_file_unix_fd( file );
off_t size = new_size;
if (unix_fd == -1) return 0;
if (sizeof(new_size) > sizeof(size) && size != new_size)
{
set_error( STATUS_INVALID_PARAMETER );
@ -152,30 +149,13 @@ static int extend_file( struct file *file, file_pos_t new_size )
return 0;
}
/* try to grow the file to the specified size */
static int grow_file( struct file *file, file_pos_t size )
{
struct stat st;
int unix_fd = get_file_unix_fd( file );
if (unix_fd == -1) return 0;
if (fstat( unix_fd, &st ) == -1)
{
file_set_error();
return 0;
}
if (st.st_size >= size) return 1; /* already large enough */
return extend_file( file, size );
}
/* find the shared PE mapping for a given mapping */
static struct file *get_shared_file( struct mapping *mapping )
{
struct mapping *ptr;
LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
if (is_same_file( ptr->file, mapping->file ))
if (is_same_file_fd( ptr->fd, mapping->fd ))
return (struct file *)grab_object( ptr->shared_file );
return NULL;
}
@ -301,8 +281,8 @@ static int build_shared_mapping( struct mapping *mapping, int fd,
/* create a temp file for the mapping */
if (!(mapping->shared_file = create_temp_file( FILE_GENERIC_READ|FILE_GENERIC_WRITE ))) return 0;
if (!grow_file( mapping->shared_file, total_size )) goto error;
if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
if (!grow_file( shared_fd, total_size )) goto error;
if (!(buffer = malloc( max_size ))) goto error;
@ -343,7 +323,7 @@ static int build_shared_mapping( struct mapping *mapping, int fd,
}
/* retrieve the mapping parameters for an executable (PE) image */
static int get_image_params( struct mapping *mapping )
static int get_image_params( struct mapping *mapping, int unix_fd )
{
IMAGE_DOS_HEADER dos;
IMAGE_SECTION_HEADER *sec = NULL;
@ -357,14 +337,11 @@ static int get_image_params( struct mapping *mapping )
IMAGE_OPTIONAL_HEADER64 hdr64;
} opt;
} nt;
struct fd *fd;
off_t pos;
int unix_fd, size;
int size;
/* load the headers */
if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
pos = dos.e_lfanew;
@ -406,33 +383,22 @@ static int get_image_params( struct mapping *mapping )
mapping->protect = VPROT_IMAGE;
free( sec );
release_object( fd );
return 1;
error:
free( sec );
release_object( fd );
set_error( STATUS_INVALID_FILE_FOR_SECTION );
return 0;
}
/* get the size of the unix file associated with the mapping */
static inline int get_file_size( struct file *file, mem_size_t *size )
{
struct stat st;
int unix_fd = get_file_unix_fd( file );
if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
*size = st.st_size;
return 1;
}
static struct object *create_mapping( struct directory *root, const struct unicode_str *name,
unsigned int attr, mem_size_t size, int protect,
obj_handle_t handle, const struct security_descriptor *sd )
{
struct mapping *mapping;
int access = 0;
int unix_fd;
struct stat st;
if (!page_mask) init_page_size();
@ -464,24 +430,26 @@ static struct object *create_mapping( struct directory *root, const struct unico
}
if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
mapping->fd = get_obj_fd( (struct object *)mapping->file );
if ((unix_fd = get_unix_fd( mapping->fd )) == -1) goto error;
if (protect & VPROT_IMAGE)
{
if (!get_image_params( mapping )) goto error;
if (!get_image_params( mapping, unix_fd )) goto error;
return &mapping->obj;
}
if (fstat( unix_fd, &st ) == -1)
{
file_set_error();
goto error;
}
if (!size)
{
if (!get_file_size( mapping->file, &size )) goto error;
if (!size)
if (!(size = st.st_size))
{
set_error( STATUS_MAPPED_FILE_SIZE_ZERO );
goto error;
}
}
else
{
if (!grow_file( mapping->file, size )) goto error;
}
else if (st.st_size < size && !grow_file( unix_fd, size )) goto error;
}
else /* Anonymous mapping (no associated file) */
{
@ -498,7 +466,8 @@ static struct object *create_mapping( struct directory *root, const struct unico
}
if (!(mapping->file = create_temp_file( access ))) goto error;
mapping->fd = get_obj_fd( (struct object *)mapping->file );
if (!grow_file( mapping->file, size )) goto error;
if ((unix_fd = get_unix_fd( mapping->fd )) == -1) goto error;
if (!grow_file( unix_fd, size )) goto error;
}
mapping->size = (size + page_mask) & ~((mem_size_t)page_mask);
mapping->protect = protect;