diff options
| author | Jan Kara <jack@suse.cz> | 2012-06-12 16:20:29 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-07-31 01:02:48 +0400 |
| commit | 4fcf1c6205fcfc7a226a144ae4d83b7f5415cab8 (patch) | |
| tree | e0a8ee8640c670123e09a8a041a3ed00c89a0d60 | |
| parent | 41c4d25f78c01ede13efee1f2e979f3f35dd26f6 (diff) | |
| download | op-kernel-dev-4fcf1c6205fcfc7a226a144ae4d83b7f5415cab8.zip op-kernel-dev-4fcf1c6205fcfc7a226a144ae4d83b7f5415cab8.tar.gz | |
mm: Make default vm_ops provide ->page_mkwrite handler
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 <kamal@canonical.com>
Tested-by: Peter M. Petrakis <peter.petrakis@canonical.com>
Tested-by: Dann Frazier <dann.frazier@canonical.com>
Tested-by: Massimo Morana <massimo.morana@canonical.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | include/linux/mm.h | 1 | ||||
| -rw-r--r-- | mm/filemap.c | 19 | ||||
| -rw-r--r-- | mm/filemap_xip.c | 1 |
3 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index b36d08c..15987d8 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1411,6 +1411,7 @@ extern void truncate_inode_pages_range(struct address_space *, /* generic vm_area_ops exported for stackable file systems */ extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); +extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); /* mm/page-writeback.c */ int write_one_page(struct page *page, int wait); diff --git a/mm/filemap.c b/mm/filemap.c index a4a5260..51efee6 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -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 */ diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c index 213ca1f..80b34ef 100644 --- a/mm/filemap_xip.c +++ b/mm/filemap_xip.c @@ -304,6 +304,7 @@ out: static const struct vm_operations_struct xip_file_vm_ops = { .fault = xip_file_fault, + .page_mkwrite = filemap_page_mkwrite, }; int xip_file_mmap(struct file * file, struct vm_area_struct * vma) |
