Btrfs: introduce common define for max number of mirrors

Readahead already has a define for the max number of mirrors. Scrub
needs such a define now, the rest of the code will need something
like this soon. Therefore the define was added to ctree.h and removed
from the readahead code.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index 22db04550f6a..dc5d33146fdb 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -54,7 +54,6 @@
  * than the 2 started one after another.
  */
 
-#define MAX_MIRRORS 2
 #define MAX_IN_FLIGHT 6
 
 struct reada_extctl {
@@ -71,7 +70,7 @@ struct reada_extent {
         struct list_head        extctl;
         struct kref             refcnt;
         spinlock_t              lock;
-        struct reada_zone       *zones[MAX_MIRRORS];
+        struct reada_zone       *zones[BTRFS_MAX_MIRRORS];
         int                     nzones;
         struct btrfs_device     *scheduled_for;
 };
@@ -84,7 +83,8 @@ struct reada_zone {
         spinlock_t              lock;
         int                     locked;
         struct btrfs_device     *device;
-        struct btrfs_device     *devs[MAX_MIRRORS]; /* full list, incl self */
+        struct btrfs_device     *devs[BTRFS_MAX_MIRRORS]; /* full list, incl
+                                                           * self */
         int                     ndevs;
         struct kref             refcnt;
 };
@@ -365,9 +365,9 @@ again:
         if (ret || !bbio || length < blocksize)
                 goto error;
 
-        if (bbio->num_stripes > MAX_MIRRORS) {
+        if (bbio->num_stripes > BTRFS_MAX_MIRRORS) {
                 printk(KERN_ERR "btrfs readahead: more than %d copies not "
-                                "supported", MAX_MIRRORS);
+                                "supported", BTRFS_MAX_MIRRORS);
                 goto error;
         }