On Tue 29-11-11 10:40:59, Josef Bacik wrote:
> The fault code has been calling file_update_time after ->page_mkwrite after it
> drops the page lock, but this is annoying because this calls mark_inode_dirty
> which can fail in Btrfs, so we want to be able to do these updates in
> ->page_mkwrite so we can get an error back to the user. So get rid of the
> file_update_time calls in the fault code and push it into everybody who has a
> ->page_mkwrite. I didn't do this for ubifs because it appears that ubifs
> already updates the time itself in ->page_mkwrite, presumebly for the same
> reasons as btrfs, so I left it as is. Thanks,
But this effectively disables atime updates on mmaped writes for ext2,
ext3, and similar filesystems which is a no-go IMHO.
Honza
>
> Signed-off-by: Josef Bacik <jo...@redhat.com>
> ---
> fs/9p/vfs_file.c | 1 +
> fs/btrfs/inode.c | 1 +
> fs/buffer.c | 1 +
> fs/ceph/addr.c | 1 +
> fs/cifs/file.c | 1 +
> fs/ext4/inode.c | 1 +
> fs/fuse/file.c | 1 +
> fs/gfs2/file.c | 1 +
> fs/nfs/file.c | 1 +
> fs/nilfs2/file.c | 1 +
> fs/ocfs2/mmap.c | 1 +
> fs/sysfs/bin.c | 1 +
> kernel/events/core.c | 1 +
> mm/memory.c | 8 --------
> security/selinux/selinuxfs.c | 1 +
> 15 files changed, 14 insertions(+), 8 deletions(-)
>
> diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
> index 62857a8..ae2968f 100644
> --- a/fs/9p/vfs_file.c
> +++ b/fs/9p/vfs_file.c
> @@ -610,6 +610,7 @@ v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct
> vm_fault *vmf)
> P9_DPRINTK(P9_DEBUG_VFS, "page %p fid %lx\n",
> page, (unsigned long)filp->private_data);
>
> + file_update_time(filp);
> v9inode = V9FS_I(inode);
> /* make sure the cache has finished storing the page */
> v9fs_fscache_wait_on_page_write(inode, page);
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index e16215f..c272b91 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -6313,6 +6313,7 @@ int btrfs_page_mkwrite(struct vm_area_struct *vma,
> struct vm_fault *vmf)
> }
>
> ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */
> + file_update_time(vma->vm_file);
> again:
> lock_page(page);
> size = i_size_read(inode);
> diff --git a/fs/buffer.c b/fs/buffer.c
> index 1a80b04..c949a11 100644
> --- a/fs/buffer.c
> +++ b/fs/buffer.c
> @@ -2347,6 +2347,7 @@ int __block_page_mkwrite(struct vm_area_struct *vma,
> struct vm_fault *vmf,
> loff_t size;
> int ret;
>
> + file_update_time(vma->vm_file);
> lock_page(page);
> size = i_size_read(inode);
> if ((page->mapping != inode->i_mapping) ||
> diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
> index 5a3953d..1cf89aa 100644
> --- a/fs/ceph/addr.c
> +++ b/fs/ceph/addr.c
> @@ -1137,6 +1137,7 @@ static int ceph_page_mkwrite(struct vm_area_struct
> *vma, struct vm_fault *vmf)
> dout("page_mkwrite %p %llu~%llu page %p idx %lu\n", inode,
> off, len, page, page->index);
>
> + file_update_time(vma->vm_file);
> lock_page(page);
>
> ret = VM_FAULT_NOPAGE;
> diff --git a/fs/cifs/file.c b/fs/cifs/file.c
> index 9f41a10..410b11c 100644
> --- a/fs/cifs/file.c
> +++ b/fs/cifs/file.c
> @@ -1910,6 +1910,7 @@ cifs_page_mkwrite(struct vm_area_struct *vma, struct
> vm_fault *vmf)
> {
> struct page *page = vmf->page;
>
> + file_update_time(vma->vm_file);
> lock_page(page);
> return VM_FAULT_LOCKED;
> }
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 986e238..e995f2c 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -4372,6 +4372,7 @@ int ext4_page_mkwrite(struct vm_area_struct *vma,
> struct vm_fault *vmf)
> goto out_ret;
> }
>
> + file_update_time(vma->vm_file);
> lock_page(page);
> size = i_size_read(inode);
> /* Page got truncated from under us? */
> diff --git a/fs/fuse/file.c b/fs/fuse/file.c
> index 594f07a..4f92651 100644
> --- a/fs/fuse/file.c
> +++ b/fs/fuse/file.c
> @@ -1323,6 +1323,7 @@ static int fuse_page_mkwrite(struct vm_area_struct
> *vma, struct vm_fault *vmf)
> */
> struct inode *inode = vma->vm_file->f_mapping->host;
>
> + file_update_time(vma->vm_file);
> fuse_wait_on_page_writeback(inode, page->index);
> return 0;
> }
> diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
> index edeb9e8..ba22704 100644
> --- a/fs/gfs2/file.c
> +++ b/fs/gfs2/file.c
> @@ -359,6 +359,7 @@ static int gfs2_page_mkwrite(struct vm_area_struct *vma,
> struct vm_fault *vmf)
> struct gfs2_alloc *al;
> int ret;
>
> + file_update_time(vma->vm_file);
> gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
> ret = gfs2_glock_nq(&gh);
> if (ret)
> diff --git a/fs/nfs/file.c b/fs/nfs/file.c
> index 28b8c3f..bfa0c48 100644
> --- a/fs/nfs/file.c
> +++ b/fs/nfs/file.c
> @@ -571,6 +571,7 @@ static int nfs_vm_page_mkwrite(struct vm_area_struct
> *vma, struct vm_fault *vmf)
> filp->f_mapping->host->i_ino,
> (long long)page_offset(page));
>
> + file_update_time(filp);
> /* make sure the cache has finished storing the page */
> nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page);
>
> diff --git a/fs/nilfs2/file.c b/fs/nilfs2/file.c
> index 2660152..d1ab350 100644
> --- a/fs/nilfs2/file.c
> +++ b/fs/nilfs2/file.c
> @@ -70,6 +70,7 @@ static int nilfs_page_mkwrite(struct vm_area_struct *vma,
> struct vm_fault *vmf)
> if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
> return VM_FAULT_SIGBUS; /* -ENOSPC */
>
> + file_update_time(vma->vm_file);
> lock_page(page);
> if (page->mapping != inode->i_mapping ||
> page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
> diff --git a/fs/ocfs2/mmap.c b/fs/ocfs2/mmap.c
> index 3e9393c..27c59e5 100644
> --- a/fs/ocfs2/mmap.c
> +++ b/fs/ocfs2/mmap.c
> @@ -141,6 +141,7 @@ static int ocfs2_page_mkwrite(struct vm_area_struct *vma,
> struct vm_fault *vmf)
>
> ocfs2_block_signals(&oldset);
>
> + file_update_time(vma->vm_file);
> /*
> * The cluster locks taken will block a truncate from another
> * node. Taking the data lock will also ensure that we don't
> diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
> index a475983..4879bfb 100644
> --- a/fs/sysfs/bin.c
> +++ b/fs/sysfs/bin.c
> @@ -225,6 +225,7 @@ static int bin_page_mkwrite(struct vm_area_struct *vma,
> struct vm_fault *vmf)
> if (!sysfs_get_active(attr_sd))
> return VM_FAULT_SIGBUS;
>
> + file_update_time(file);
> ret = 0;
> if (bb->vm_ops->page_mkwrite)
> ret = bb->vm_ops->page_mkwrite(vma, vmf);
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index 0f85778..abbaee4 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -3466,6 +3466,7 @@ static int perf_mmap_fault(struct vm_area_struct *vma,
> struct vm_fault *vmf)
> struct ring_buffer *rb;
> int ret = VM_FAULT_SIGBUS;
>
> + file_update_time(vma->vm_file);
> if (vmf->flags & FAULT_FLAG_MKWRITE) {
> if (vmf->pgoff == 0)
> ret = 0;
> diff --git a/mm/memory.c b/mm/memory.c
> index a56e3ba..8e4686f 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -2619,10 +2619,6 @@ reuse:
> }
> }
>
> - /* file_update_time outside page_lock */
> - if (vma->vm_file)
> - file_update_time(vma->vm_file);
> -
> return ret;
> }
>
> @@ -3303,10 +3299,6 @@ static int __do_fault(struct mm_struct *mm, struct
> vm_area_struct *vma,
> */
> balance_dirty_pages_ratelimited(mapping);
> }
> -
> - /* file_update_time outside page_lock */
> - if (vma->vm_file)
> - file_update_time(vma->vm_file);
> } else {
> unlock_page(vmf.page);
> if (anon)
> diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
> index 55d92cb..e5f4be1 100644
> --- a/security/selinux/selinuxfs.c
> +++ b/security/selinux/selinuxfs.c
> @@ -458,6 +458,7 @@ static int sel_mmap_policy_fault(struct vm_area_struct
> *vma,
> unsigned long offset;
> struct page *page;
>
> + file_update_time(vma->vm_file);
> if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
> return VM_FAULT_SIGBUS;
>
> --
> 1.7.5.2
>
> --
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--
Jan Kara <j...@suse.cz>
SUSE Labs, CR
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