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-rw-r--r--fs/ramfs/file-nommu.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index 2efc57173fd7..266531343aae 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -131,6 +131,8 @@ static int ramfs_nommu_check_mappings(struct inode *inode,
struct vm_area_struct *vma;
struct prio_tree_iter iter;
+ down_write(&nommu_region_sem);
+
/* search for VMAs that fall within the dead zone */
vma_prio_tree_foreach(vma, &iter, &inode->i_mapping->i_mmap,
newsize >> PAGE_SHIFT,
@@ -138,10 +140,13 @@ static int ramfs_nommu_check_mappings(struct inode *inode,
) {
/* found one - only interested if it's shared out of the page
* cache */
- if (vma->vm_flags & VM_SHARED)
+ if (vma->vm_flags & VM_SHARED) {
+ up_write(&nommu_region_sem);
return -ETXTBSY; /* not quite true, but near enough */
+ }
}
+ up_write(&nommu_region_sem);
return 0;
}