diff options
Diffstat (limited to 'bin/cp')
| -rw-r--r-- | bin/cp/utils.c | 58 |
1 files changed, 28 insertions, 30 deletions
diff --git a/bin/cp/utils.c b/bin/cp/utils.c index 2d8987f..03ddbbc 100644 --- a/bin/cp/utils.c +++ b/bin/cp/utils.c @@ -137,41 +137,39 @@ copy_file(const FTSENT *entp, int dne) * Mmap and write if less than 8M (the limit is so we don't totally * trash memory on big files. This is really a minor hack, but it * wins some CPU back. + * Some filesystems, such as smbnetfs, don't support mmap, + * so this is a best-effort attempt. */ #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED if (S_ISREG(fs->st_mode) && fs->st_size > 0 && - fs->st_size <= 8 * 1048576) { - if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, - MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { + fs->st_size <= 8 * 1024 * 1024 && + (p = mmap(NULL, (size_t)fs->st_size, PROT_READ, + MAP_SHARED, from_fd, (off_t)0)) != MAP_FAILED) { + wtotal = 0; + for (bufp = p, wresid = fs->st_size; ; + bufp += wcount, wresid -= (size_t)wcount) { + wcount = write(to_fd, bufp, wresid); + if (wcount <= 0) + break; + wtotal += wcount; + if (info) { + info = 0; + (void)fprintf(stderr, + "%s -> %s %3d%%\n", + entp->fts_path, to.p_path, + cp_pct(wtotal, fs->st_size)); + } + if (wcount >= (ssize_t)wresid) + break; + } + if (wcount != (ssize_t)wresid) { + warn("%s", to.p_path); + rval = 1; + } + /* Some systems don't unmap on close(2). */ + if (munmap(p, fs->st_size) < 0) { warn("%s", entp->fts_path); rval = 1; - } else { - wtotal = 0; - for (bufp = p, wresid = fs->st_size; ; - bufp += wcount, wresid -= (size_t)wcount) { - wcount = write(to_fd, bufp, wresid); - if (wcount <= 0) - break; - wtotal += wcount; - if (info) { - info = 0; - (void)fprintf(stderr, - "%s -> %s %3d%%\n", - entp->fts_path, to.p_path, - cp_pct(wtotal, fs->st_size)); - } - if (wcount >= (ssize_t)wresid) - break; - } - if (wcount != (ssize_t)wresid) { - warn("%s", to.p_path); - rval = 1; - } - /* Some systems don't unmap on close(2). */ - if (munmap(p, fs->st_size) < 0) { - warn("%s", entp->fts_path); - rval = 1; - } } } else #endif |
