[GFS2] Use vmalloc() in dir code

When allocating memory to sort directory entries, use vmalloc()
rather than kmalloc() since for larger directories, the required
size can easily be graeter than the 128k maximum of kmalloc().

Also adding the first steps towards getting the AOP_TRUNCATED_PAGE
return code get in the glock code by flagging all places where we
request a glock and we are holding a page lock.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index fe6c5adc5df..eb68cdd41d4 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -61,6 +61,7 @@
 #include <linux/sort.h>
 #include <linux/gfs2_ondisk.h>
 #include <linux/crc32.h>
+#include <linux/vmalloc.h>
 #include <asm/semaphore.h>
 
 #include "gfs2.h"
@@ -1290,7 +1291,7 @@ static int gfs2_dir_read_leaf(struct inode *inode, u64 *offset, void *opaque,
                 return 0;
 
         error = -ENOMEM;
-        larr = kmalloc((leaves + entries) * sizeof(void*), GFP_KERNEL);
+        larr = vmalloc((leaves + entries) * sizeof(void*));
         if (!larr)
                 goto out;
         darr = (const struct gfs2_dirent **)(larr + leaves);
@@ -1323,7 +1324,7 @@ static int gfs2_dir_read_leaf(struct inode *inode, u64 *offset, void *opaque,
 out_kfree:
         for(i = 0; i < leaf; i++)
                 brelse(larr[i]);
-        kfree(larr);
+        vfree(larr);
 out:
         return error;
 }