Merge branch 'for-4.18/dax' into libnvdimm-for-next
[muen/linux.git] / fs / xfs / xfs_file.c
index f5695dc314f109a82ee856087ed36dcc440e0c36..19b0c3e0e232203ffb2c8f7c60d640424542b2b7 100644 (file)
@@ -838,22 +838,26 @@ xfs_file_fallocate(
                if (error)
                        goto out_unlock;
        } else if (mode & FALLOC_FL_INSERT_RANGE) {
-               unsigned int blksize_mask = i_blocksize(inode) - 1;
+               unsigned int    blksize_mask = i_blocksize(inode) - 1;
+               loff_t          isize = i_size_read(inode);
 
-               new_size = i_size_read(inode) + len;
                if (offset & blksize_mask || len & blksize_mask) {
                        error = -EINVAL;
                        goto out_unlock;
                }
 
-               /* check the new inode size does not wrap through zero */
-               if (new_size > inode->i_sb->s_maxbytes) {
+               /*
+                * New inode size must not exceed ->s_maxbytes, accounting for
+                * possible signed overflow.
+                */
+               if (inode->i_sb->s_maxbytes - isize < len) {
                        error = -EFBIG;
                        goto out_unlock;
                }
+               new_size = isize + len;
 
                /* Offset should be less than i_size */
-               if (offset >= i_size_read(inode)) {
+               if (offset >= isize) {
                        error = -EINVAL;
                        goto out_unlock;
                }
@@ -936,8 +940,18 @@ xfs_file_dedupe_range(
        struct file     *dst_file,
        u64             dst_loff)
 {
+       struct inode    *srci = file_inode(src_file);
+       u64             max_dedupe;
        int             error;
 
+       /*
+        * Since we have to read all these pages in to compare them, cut
+        * it off at MAX_RW_COUNT/2 rounded down to the nearest block.
+        * That means we won't do more than MAX_RW_COUNT IO per request.
+        */
+       max_dedupe = (MAX_RW_COUNT >> 1) & ~(i_blocksize(srci) - 1);
+       if (len > max_dedupe)
+               len = max_dedupe;
        error = xfs_reflink_remap_range(src_file, loff, dst_file, dst_loff,
                                     len, true);
        if (error)