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authorDavid S. Miller <davem@davemloft.net>2012-07-19 11:17:30 -0700
committerDavid S. Miller <davem@davemloft.net>2012-07-19 11:17:30 -0700
commitabaa72d7fd9a20a67b62e6afa0e746e27851dc33 (patch)
treeebe4134fcc93a6e205e6004b3e652d7a62281651 /mm/madvise.c
parent67da22d23fa6f3324e03bcd0580b914b2e4afbf3 (diff)
parent3e4b9459fb0e149c6b74c9e89399a8fc39a92b44 (diff)
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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Conflicts: drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
Diffstat (limited to 'mm/madvise.c')
-rw-r--r--mm/madvise.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/mm/madvise.c b/mm/madvise.c
index deff1b6..14d260f 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -15,6 +15,7 @@
#include <linux/sched.h>
#include <linux/ksm.h>
#include <linux/fs.h>
+#include <linux/file.h>
/*
* Any behaviour which results in changes to the vma->vm_flags needs to
@@ -204,14 +205,16 @@ static long madvise_remove(struct vm_area_struct *vma,
{
loff_t offset;
int error;
+ struct file *f;
*prev = NULL; /* tell sys_madvise we drop mmap_sem */
if (vma->vm_flags & (VM_LOCKED|VM_NONLINEAR|VM_HUGETLB))
return -EINVAL;
- if (!vma->vm_file || !vma->vm_file->f_mapping
- || !vma->vm_file->f_mapping->host) {
+ f = vma->vm_file;
+
+ if (!f || !f->f_mapping || !f->f_mapping->host) {
return -EINVAL;
}
@@ -221,11 +224,18 @@ static long madvise_remove(struct vm_area_struct *vma,
offset = (loff_t)(start - vma->vm_start)
+ ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
- /* filesystem's fallocate may need to take i_mutex */
+ /*
+ * Filesystem's fallocate may need to take i_mutex. We need to
+ * explicitly grab a reference because the vma (and hence the
+ * vma's reference to the file) can go away as soon as we drop
+ * mmap_sem.
+ */
+ get_file(f);
up_read(&current->mm->mmap_sem);
- error = do_fallocate(vma->vm_file,
+ error = do_fallocate(f,
FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
offset, end - start);
+ fput(f);
down_read(&current->mm->mmap_sem);
return error;
}