lib: added {big,page}_alloc_zero routines

[libucw.git] / lib / fb-mmap.c

diff --git a/lib/fb-mmap.c b/lib/fb-mmap.c
index 85dc27ee2c10566e4d77d222acad39e87d495a4c..1e610c9c9d18b99bf2eba577f850d765d7fc8a24 100644 (file)
--- a/lib/fb-mmap.c
+++ b/lib/fb-mmap.c
@@ -40,6 +40,7 @@ struct fb_mmap {
   sh_off_t file_size;
   sh_off_t file_extend;
   sh_off_t window_pos;
   sh_off_t file_size;
   sh_off_t file_extend;
   sh_off_t window_pos;

+  uns window_size;

   int mode;
 };
 #define FB_MMAP(f) ((struct fb_mmap *)(f)->is_fastbuf)
   int mode;
 };
 #define FB_MMAP(f) ((struct fb_mmap *)(f)->is_fastbuf)


@@ -51,15 +52,15 @@ bfmm_map_window(struct fastbuf *f)
   sh_off_t pos0 = f->pos & ~(sh_off_t)(CPU_PAGE_SIZE-1);
   int l = MIN((sh_off_t)mmap_window_size, F->file_extend - pos0);
   uns ll = ALIGN_TO(l, CPU_PAGE_SIZE);
   sh_off_t pos0 = f->pos & ~(sh_off_t)(CPU_PAGE_SIZE-1);
   int l = MIN((sh_off_t)mmap_window_size, F->file_extend - pos0);
   uns ll = ALIGN_TO(l, CPU_PAGE_SIZE);

-  uns oll = ALIGN_TO(f->bufend - f->buffer, CPU_PAGE_SIZE);

   int prot = ((F->mode & O_ACCMODE) == O_RDONLY) ? PROT_READ : (PROT_READ | PROT_WRITE);
 
   DBG(" ... Mapping %x(%x)+%x(%x) len=%x extend=%x", (int)pos0, (int)f->pos, ll, l, (int)F->file_size, (int)F->file_extend);
   int prot = ((F->mode & O_ACCMODE) == O_RDONLY) ? PROT_READ : (PROT_READ | PROT_WRITE);
 
   DBG(" ... Mapping %x(%x)+%x(%x) len=%x extend=%x", (int)pos0, (int)f->pos, ll, l, (int)F->file_size, (int)F->file_extend);

-  if (ll != oll && f->buffer)
+  if (ll != F->window_size && f->buffer)

     {
     {

-      munmap(f->buffer, oll);
+      munmap(f->buffer, F->window_size);

       f->buffer = NULL;
     }
       f->buffer = NULL;
     }

+  F->window_size = ll;

   if (!f->buffer)
     f->buffer = sh_mmap(NULL, ll, prot, MAP_SHARED, F->fd, pos0);
   else
   if (!f->buffer)
     f->buffer = sh_mmap(NULL, ll, prot, MAP_SHARED, F->fd, pos0);
   else


@@ -117,7 +118,7 @@ bfmm_spout(struct fastbuf *f)
   DBG(" -> %p %p %p(%x) %p", f->buffer, f->bptr, f->bstop, (int)f->pos, f->bufend);
 }
 
   DBG(" -> %p %p %p(%x) %p", f->buffer, f->bptr, f->bstop, (int)f->pos, f->bufend);
 }
 

-static void
+static int

 bfmm_seek(struct fastbuf *f, sh_off_t pos, int whence)
 {
   if (whence == SEEK_END)
 bfmm_seek(struct fastbuf *f, sh_off_t pos, int whence)
 {
   if (whence == SEEK_END)


@@ -126,8 +127,9 @@ bfmm_seek(struct fastbuf *f, sh_off_t pos, int whence)
     ASSERT(whence == SEEK_SET);
   ASSERT(pos >= 0 && pos <= FB_MMAP(f)->file_size);
   f->pos = pos;
     ASSERT(whence == SEEK_SET);
   ASSERT(pos >= 0 && pos <= FB_MMAP(f)->file_size);
   f->pos = pos;

-  f->bptr = f->bstop = f->bufend;      /* force refill/spout call */
+  f->bptr = f->bstop = f->bufend = f->buffer;  /* force refill/spout call */

   DBG("Seek -> %p %p %p(%x) %p", f->buffer, f->bptr, f->bstop, (int)f->pos, f->bufend);
   DBG("Seek -> %p %p %p(%x) %p", f->buffer, f->bptr, f->bstop, (int)f->pos, f->bufend);

+  return 1;

 }
 
 static void
 }
 
 static void


@@ -136,7 +138,7 @@ bfmm_close(struct fastbuf *f)
   struct fb_mmap *F = FB_MMAP(f);
 
   if (f->buffer)
   struct fb_mmap *F = FB_MMAP(f);
 
   if (f->buffer)

-    munmap(f->buffer, ALIGN_TO(f->bufend-f->buffer, CPU_PAGE_SIZE));
+    munmap(f->buffer, F->window_size);

   if (F->file_extend > F->file_size &&
       sh_ftruncate(F->fd, F->file_size))
     die("ftruncate(%s): %m", f->name);
   if (F->file_extend > F->file_size &&
       sh_ftruncate(F->fd, F->file_size))
     die("ftruncate(%s): %m", f->name);


@@ -164,7 +166,7 @@ bfmm_config(struct fastbuf *f, uns item, int value)
     }
 }
 
     }
 }
 

-static struct fastbuf *
+struct fastbuf *

 bfmmopen_internal(int fd, byte *name, uns mode)
 {
   int namelen = strlen(name) + 1;
 bfmmopen_internal(int fd, byte *name, uns mode)
 {
   int namelen = strlen(name) + 1;


@@ -188,20 +190,6 @@ bfmmopen_internal(int fd, byte *name, uns mode)
   return f;
 }
 
   return f;
 }
 

-struct fastbuf *
-bopen_mm(byte *name, uns mode)
-{
-  int fd;
-
-  if ((mode & O_ACCMODE) == O_WRONLY)
-    mode = (mode & ~O_ACCMODE) | O_RDWR;
-  fd = sh_open(name, mode, 0666);
-  if (fd < 0)
-    die("Unable to %s file %s: %m",
-       (mode & O_CREAT) ? "create" : "open", name);
-  return bfmmopen_internal(fd, name, mode);
-}
-

 #ifdef TEST
 
 int main(int argc, char **argv)
 #ifdef TEST
 
 int main(int argc, char **argv)