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mm: Make default vm_ops provide ->page_mkwrite handler

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Make default vm_ops provide ->page_mkwrite handler. Currently it only updates
file's modification times and gets locked page but later it will also handle
filesystem freezing.

BugLink: https://bugs.launchpad.net/bugs/897421
Tested-by: Kamal Mostafa <[email protected]>
Tested-by: Peter M. Petrakis <[email protected]>
Tested-by: Dann Frazier <[email protected]>
Tested-by: Massimo Morana <[email protected]>
Signed-off-by: Jan Kara <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Jan Kara 2012-06-12 16:20:29 +02:00 • committed by Al Viro
commit 4fcf1c6205
3 changed files with 21 additions and 0 deletions
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19
mm/filemap.c
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@ -1712,8 +1712,27 @@ page_not_uptodate:
}
EXPORT_SYMBOL(filemap_fault);
int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct page *page = vmf->page;
struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
int ret = VM_FAULT_LOCKED;
file_update_time(vma->vm_file);
lock_page(page);
if (page->mapping != inode->i_mapping) {
unlock_page(page);
ret = VM_FAULT_NOPAGE;
goto out;
}
out:
return ret;
}
EXPORT_SYMBOL(filemap_page_mkwrite);
const struct vm_operations_struct generic_file_vm_ops = {
.fault = filemap_fault,
.page_mkwrite = filemap_page_mkwrite,
};
/* This is used for a general mmap of a disk file */