btrfs: update timestamps on truncate()

truncate() vs. ftruncate() differ in the VFS; truncate()
doesn't set (ATTR_CTIME | ATTR_MTIME), and it's up to the
fs to do the timestamp updates if the size changes.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3d2c64d4734ac73ee056d9b9a300c4e965fb9d61..9bc6c40b182dd0b0d249a7c982330b67ecc49574 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -88,7 +88,7 @@ static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
        [S_IFLNK >> S_SHIFT]    = BTRFS_FT_SYMLINK,
 };
 
-static int btrfs_setsize(struct inode *inode, loff_t newsize);
+static int btrfs_setsize(struct inode *inode, struct iattr *attr);
 static int btrfs_truncate(struct inode *inode);
 static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent);
 static noinline int cow_file_range(struct inode *inode,
@@ -3761,16 +3761,27 @@ next:
        return err;
 }
 
-static int btrfs_setsize(struct inode *inode, loff_t newsize)
+static int btrfs_setsize(struct inode *inode, struct iattr *attr)
 {
        struct btrfs_root *root = BTRFS_I(inode)->root;
        struct btrfs_trans_handle *trans;
        loff_t oldsize = i_size_read(inode);
+       loff_t newsize = attr->ia_size;
+       int mask = attr->ia_valid;
        int ret;
 
        if (newsize == oldsize)
                return 0;
 
+       /*
+        * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
+        * special case where we need to update the times despite not having
+        * 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) {
                truncate_pagecache(inode, oldsize, newsize);
                ret = btrfs_cont_expand(inode, oldsize, newsize);
@@ -3843,7 +3854,7 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
                return err;
 
        if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) {
-               err = btrfs_setsize(inode, attr->ia_size);
+               err = btrfs_setsize(inode, attr);
                if (err)
                        return err;
        }