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On Tue, Nov 19, 2013 at 07:17:07AM -0800, Christoph Hellwig wrote:
> Currently notify_change directly updates i_version for size updates,
> which not only is counter to how all other fields are updated through
> struct iattr, but also breaks XFS, which need inode updates to happen
> under its own lock, and synchronized to the structure that gets written
> to the log.
>
> Remove the update in the common code, and it to btrfs and ext4,
> XFS already does a proper updaste internally and currently gets a
> double update with the existing code.
>
> IMHO this is 3.13 and -stable material and should go in through the XFS
> tree.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
>
> Index: xfs/fs/attr.c
> ===================================================================
> --- xfs.orig/fs/attr.c 2013-11-19 16:08:42.275415189 +0100
> +++ xfs/fs/attr.c 2013-11-19 16:08:51.803414994 +0100
> @@ -182,11 +182,6 @@ int notify_change(struct dentry * dentry
> return -EPERM;
> }
>
> - if ((ia_valid & ATTR_SIZE) && IS_I_VERSION(inode)) {
> - if (attr->ia_size != inode->i_size)
> - inode_inc_iversion(inode);
> - }
> -
> if ((ia_valid & ATTR_MODE)) {
> umode_t amode = attr->ia_mode;
> /* Flag setting protected by i_mutex */
> Index: xfs/fs/btrfs/inode.c
> ===================================================================
> --- xfs.orig/fs/btrfs/inode.c 2013-11-19 16:08:42.275415189 +0100
> +++ xfs/fs/btrfs/inode.c 2013-11-19 16:08:51.803414994 +0100
> @@ -4345,8 +4345,12 @@ static int btrfs_setsize(struct inode *i
> * these flags set. For all other operations the VFS set these flags
> * explicitly if it wants a timestamp update.
> */
> - if (newsize != oldsize && (!(mask & (ATTR_CTIME | ATTR_MTIME))))
> - inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
> + if (newsize != oldsize) {
> + inode_inc_iversion(inode);
> + if (!(mask & (ATTR_CTIME | ATTR_MTIME)))
> + inode->i_ctime = inode->i_mtime =
> + current_fs_time(inode->i_sb);
> + }
>
> if (newsize > oldsize) {
> truncate_pagecache(inode, newsize);
> Index: xfs/fs/ext4/inode.c
> ===================================================================
> --- xfs.orig/fs/ext4/inode.c 2013-11-19 16:08:42.275415189 +0100
> +++ xfs/fs/ext4/inode.c 2013-11-19 16:08:51.803414994 +0100
> @@ -4594,6 +4594,10 @@ int ext4_setattr(struct dentry *dentry,
> if (attr->ia_size > sbi->s_bitmap_maxbytes)
> return -EFBIG;
> }
> +
> + if (IS_I_VERSION(inode) && attr->ia_size != inode->i_size)
> + inode_inc_iversion(inode);
> +
> if (S_ISREG(inode->i_mode) &&
> (attr->ia_size < inode->i_size)) {
> if (ext4_should_order_data(inode)) {
>
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