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/ext3/file.c | 19 ++++++++++++++++++-
fs/ext3/inode.c | 5 +++++
include/linux/ext3_fs.h | 1 +
3 files changed, 24 insertions(+), 1 deletions(-)
diff --git a/fs/ext3/file.c b/fs/ext3/file.c
index acc4913..09e22e4 100644
--- a/fs/ext3/file.c
+++ b/fs/ext3/file.c
@@ -106,6 +106,23 @@ force_commit:
return ret;
}
+static struct vm_operations_struct ext3_file_vm_ops = {
+ .fault = filemap_fault,
+ .page_mkwrite = ext3_page_mkwrite,
+};
+
+static int ext3_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 = &ext3_file_vm_ops;
+ vma->vm_flags |= VM_CAN_NONLINEAR;
+ return 0;
+}
+
const struct file_operations ext3_file_operations = {
.llseek = generic_file_llseek,
.read = do_sync_read,
@@ -116,7 +133,7 @@ const struct file_operations ext3_file_operations = {
#ifdef CONFIG_COMPAT
.compat_ioctl = ext3_compat_ioctl,
#endif
- .mmap = generic_file_mmap,
+ .mmap = ext3_file_mmap,
.open = generic_file_open,
.release = ext3_release_file,
.fsync = ext3_sync_file,
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index eb95670..2293506 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -3306,3 +3306,8 @@ int ext3_change_inode_journal_flag(struct inode *inode, int val)
return err;
}
+
+int ext3_page_mkwrite(struct vm_area_struct *vma, struct page *page)
+{
+ return block_page_mkwrite(vma, page, ext3_get_block);
+}
diff --git a/include/linux/ext3_fs.h b/include/linux/ext3_fs.h
index 36c5403..715c35e 100644
--- a/include/linux/ext3_fs.h
+++ b/include/linux/ext3_fs.h
@@ -836,6 +836,7 @@ extern void ext3_truncate (struct inode *);
extern void ext3_set_inode_flags(struct inode *);
extern void ext3_get_inode_flags(struct ext3_inode_info *);
extern void ext3_set_aops(struct inode *inode);
+extern int ext3_page_mkwrite(struct vm_area_struct *vma, struct page *page);
/* ioctl.c */
extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
--
1.5.5.rc0.16.g02b00.dirty
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