all: use mapping_set_gfp_mask() everywhere

brick_say.c

@@ -12,6 +12,8 @@
 // messaging
 
 #include <linux/fs.h>
+#include <linux/blkdev.h>
+#include <linux/file.h>
 #include <linux/sched.h>
 #include <linux/preempt.h>
 #include <linux/hardirq.h>
@@ -518,6 +520,7 @@ EXPORT_SYMBOL_GPL(brick_say_to);
 static
 void try_open_file(struct file **file, char *filename, bool creat)
 {
+	struct address_space *mapping;
 	int flags = O_APPEND | O_WRONLY | O_LARGEFILE;
 	int prot = 0600;
 
@@ -527,6 +530,8 @@ void try_open_file(struct file **file, char *filename, bool creat)
 	*file = filp_open(filename, flags, prot);
 	if (unlikely(IS_ERR(*file))) {
 		*file = NULL;
+	} else if ((mapping = (*file)->f_mapping)) {
+		mapping_set_gfp_mask(mapping, mapping_gfp_mask(mapping) & ~(__GFP_IO | __GFP_FS));
 	}
 }
 

mars_bio.c

@@ -653,6 +653,7 @@ static int bio_switch(struct bio_brick *brick)
 			const char *path = brick->brick_path;
 			int flags = O_RDWR | O_EXCL | O_LARGEFILE;
 			int prot = 0600;
+			struct address_space *mapping;
 			struct inode *inode;
 			struct request_queue *q;
 			mm_segment_t oldfs;
@@ -668,7 +669,7 @@ static int bio_switch(struct bio_brick *brick)
 				goto done;
 			}
 			
-			if (unlikely(!brick->filp->f_mapping ||
+			if (unlikely(!(mapping = brick->filp->f_mapping) ||
 				     !(inode = brick->filp->f_mapping->host))) {
 				MARS_ERR("internal problem with '%s'\n", path);
 				status = -EINVAL;
@@ -680,6 +681,8 @@ static int bio_switch(struct bio_brick *brick)
 				goto done;
 			}
 
+			mapping_set_gfp_mask(mapping, mapping_gfp_mask(mapping) & ~(__GFP_IO | __GFP_FS));
+
 			q = bdev_get_queue(inode->i_bdev);
 			if (unlikely(!q)) {
 				MARS_ERR("internal queue '%s' does not exist\n", path);

mars_sio.c

@@ -572,6 +572,7 @@ static int sio_switch(struct sio_brick *brick)
 		MARS_INF("using O_DIRECT on %s\n", path);
 	}
 	if (brick->power.button) {
+		struct address_space *mapping;
 		int index;
 
 		mars_power_led_off((void*)brick, false);
@@ -589,13 +590,11 @@ static int sio_switch(struct sio_brick *brick)
 			output->filp = NULL;
 			return err;
 		}
-#if 0
+
-		{
+		if ((mapping = output->filp->f_mapping)) {
-			struct address_space *mapping = output->filp->f_mapping;
+			mapping_set_gfp_mask(mapping, mapping_gfp_mask(mapping) & ~(__GFP_IO | __GFP_FS));
-			int old_gfp_mask = mapping_gfp_mask(mapping);
-			mapping_set_gfp_mask(mapping, old_gfp_mask & ~(__GFP_IO|__GFP_FS));
 		}
-#endif
+
 		MARS_INF("opened file '%s' as %p\n", path, output->filp);
 
 		output->index = 0;

sy_old/sy_generic.c

@@ -9,6 +9,7 @@
 #include <linux/string.h>
 #include <linux/uaccess.h>
 #include <linux/file.h>
+#include <linux/blkdev.h>
 #include <linux/fs.h>
 #include <linux/utsname.h>
 
@@ -614,6 +615,7 @@ err_mem0:
 static int _mars_readdir(struct mars_cookie *cookie)
 {
 	struct file *f;
+	struct address_space *mapping;
         mm_segment_t oldfs;
 	int status = 0;
 
@@ -624,6 +626,9 @@ static int _mars_readdir(struct mars_cookie *cookie)
 	if (unlikely(IS_ERR(f))) {
 		return PTR_ERR(f);
 	}
+	if ((mapping = f->f_mapping)) {
+		mapping_set_gfp_mask(mapping, mapping_gfp_mask(mapping) & ~(__GFP_IO | __GFP_FS));
+	}
 
 	for (;;) {
 		status = vfs_readdir(f, mars_filler, cookie);