diff options
| -rw-r--r-- | src/copy.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/src/copy.c b/src/copy.c index f6f9ea6f2..3db07b5b4 100644 --- a/src/copy.c +++ b/src/copy.c @@ -764,6 +764,23 @@ fchmod_or_lchmod (int desc, char const *name, mode_t mode) return lchmod (name, mode); } +#ifndef HAVE_STRUCT_STAT_ST_BLOCKS +# define HAVE_STRUCT_STAT_ST_BLOCKS 0 +#endif + +/* Use a heuristic to determine whether stat buffer SB comes from a file + with sparse blocks. If the file has fewer blocks than would normally + be needed for a file of its size, then at least one of the blocks in + the file is a hole. In that case, return true. */ +static bool +is_probably_sparse (struct stat const *sb) +{ + return (HAVE_STRUCT_STAT_ST_BLOCKS + && S_ISREG (sb->st_mode) + && ST_NBLOCKS (*sb) < sb->st_size / ST_NBLOCKSIZE); +} + + /* Copy a regular file from SRC_NAME to DST_NAME. If the source file contains holes, copies holes and blocks of zeros in the source file as holes in the destination file. @@ -984,15 +1001,13 @@ copy_reg (char const *src_name, char const *dst_name, if (x->sparse_mode == SPARSE_ALWAYS) make_holes = true; -#if HAVE_STRUCT_STAT_ST_BLOCKS /* Use a heuristic to determine whether SRC_NAME contains any sparse blocks. If the file has fewer blocks than would normally be needed for a file of its size, then at least one of the blocks in the file is a hole. */ - if (x->sparse_mode == SPARSE_AUTO && S_ISREG (src_open_sb.st_mode) - && ST_NBLOCKS (src_open_sb) < src_open_sb.st_size / ST_NBLOCKSIZE) + if (x->sparse_mode == SPARSE_AUTO + && is_probably_sparse (&src_open_sb)) make_holes = true; -#endif } /* If not making a sparse file, try to use a more-efficient |