We would like to get notified when we are doing a write on mmap
section. The changes are needed to handle ENOSPC when writing to an
mmap section of files with holes.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
---
fs/ext2/ext2.h | 1 +
fs/ext2/file.c | 21 ++++++++++++++++++++-
fs/ext2/inode.c | 5 +++++
3 files changed, 26 insertions(+), 1 deletions(-)
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 47d88da..cc2e106 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -136,6 +136,7 @@ extern void ext2_get_inode_flags(struct ext2_inode_info *);
int __ext2_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata);
+extern int ext2_page_mkwrite(struct vm_area_struct *vma, struct page *page);
/* ioctl.c */
extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index 5f2fa9c..d539dcf 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -18,6 +18,7 @@
* (jj@xxxxxxxxxxxxxxxxxxxxxx)
*/
+#include <linux/mm.h>
#include <linux/time.h>
#include "ext2.h"
#include "xattr.h"
@@ -38,6 +39,24 @@ static int ext2_release_file (struct inode * inode, struct file * filp)
return 0;
}
+static struct vm_operations_struct ext2_file_vm_ops = {
+ .fault = filemap_fault,
+ .page_mkwrite = ext2_page_mkwrite,
+};
+
+static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct address_space *mapping = file->f_mapping;
+
+ if (!mapping->a_ops->readpage)
+ return -ENOEXEC;
+ file_accessed(file);
+ vma->vm_ops = &ext2_file_vm_ops;
+ vma->vm_flags |= VM_CAN_NONLINEAR;
+ return 0;
+}
+
+
/*
* We have mostly NULL's here: the current defaults are ok for
* the ext2 filesystem.
@@ -52,7 +71,7 @@ static int ext2_release_file (struct inode * inode, struct file * filp)
#ifdef CONFIG_COMPAT
.compat_ioctl = ext2_compat_ioctl,
#endif
- .mmap = generic_file_mmap,
+ .mmap = ext2_file_mmap,
.open = generic_file_open,
.release = ext2_release_file,
.fsync = ext2_sync_file,
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 384fc0d..d4c5c23 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -1443,3 +1443,8 @@ int ext2_setattr(struct dentry *dentry, struct iattr *iattr)
error = ext2_acl_chmod(inode);
return error;
}
+
+int ext2_page_mkwrite(struct vm_area_struct *vma, struct page *page)
+{
+ return block_page_mkwrite(vma, page, ext2_get_block);
+}
--
1.5.5.1.357.g1af8b.dirty
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