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authorUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
committerUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
commita334319f6530564d22e775935d9c91663623a1b4 (patch)
treeb5877475619e4c938e98757d518bb1e9cbead751 /sysdeps/posix/posix_fallocate64.c
parent0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (diff)
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(CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.
Diffstat (limited to 'sysdeps/posix/posix_fallocate64.c')
-rw-r--r--sysdeps/posix/posix_fallocate64.c47
1 files changed, 12 insertions, 35 deletions
diff --git a/sysdeps/posix/posix_fallocate64.c b/sysdeps/posix/posix_fallocate64.c
index 64ca9ae83d..0eba4161a5 100644
--- a/sysdeps/posix/posix_fallocate64.c
+++ b/sysdeps/posix/posix_fallocate64.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2000, 2003, 2004, 2005 Free Software Foundation, Inc.
+/* Copyright (C) 2000, 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -29,8 +29,9 @@ __posix_fallocate64_l64 (int fd, __off64_t offset, __off64_t len)
{
struct stat64 st;
struct statfs64 f;
+ size_t step;
- /* `off64_t' is a signed type. Therefore we can determine whether
+ /* `off64_tī is a signed type. Therefore we can determine whether
OFFSET + LEN is too large if it is a negative value. */
if (offset < 0 || len < 0)
return EINVAL;
@@ -46,48 +47,24 @@ __posix_fallocate64_l64 (int fd, __off64_t offset, __off64_t len)
if (! S_ISREG (st.st_mode))
return ENODEV;
- if (len == 0)
- {
- if (st.st_size < offset)
- {
- int ret = __ftruncate64 (fd, offset);
-
- if (ret != 0)
- ret = errno;
- return ret;
- }
- return 0;
- }
-
/* We have to know the block size of the filesystem to get at least some
sort of performance. */
if (__fstatfs64 (fd, &f) != 0)
return errno;
- /* Try to play safe. */
- if (f.f_bsize == 0)
- f.f_bsize = 512;
+ /* Align OFFSET to block size and adjust LEN. */
+ step = (offset + f.f_bsize - 1) % ~f.f_bsize;
+ offset += step;
/* Write something to every block. */
- for (offset += (len - 1) % f.f_bsize; len > 0; offset += f.f_bsize)
+ while (len > step)
{
- len -= f.f_bsize;
-
- if (offset < st.st_size)
- {
- unsigned char c;
- ssize_t rsize = __libc_pread64 (fd, &c, 1, offset);
-
- if (rsize < 0)
- return errno;
- /* If there is a non-zero byte, the block must have been
- allocated already. */
- else if (rsize == 1 && c != 0)
- continue;
- }
-
- if (__libc_pwrite64 (fd, "", 1, offset) != 1)
+ len -= step;
+
+ if (__pwrite64 (fd, "", 1, offset) != 1)
return errno;
+
+ offset += step;
}
return 0;