[Bug 11588] better handling for --preallocate with --sparse

[samba-bugs at samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=11588

--- Comment #14 from Theodore Ts'o <tytso at mit.edu> ---
>I believe "on the same file handle" is the unusual prerequisite to trigger the >behavior described by Wayne.

I was fairly sure that was a red herring, so I was trying to save myself some
time, but no, it doesn't replicate even if you use the same file descriptor....

<tytso at callcc> {/usr/projects/linux/ext4}   (origin)
1009% strace /tmp/test-fallocate 
execve("/tmp/test-fallocate", ["/tmp/test-fallocate"], [/* 64 vars */]) = 0
brk(NULL)                               = 0x187e000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f20e7d2a000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=101609, ...}) = 0
mmap(NULL, 101609, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f20e7d11000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\3\2\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1685264, ...}) = 0
mmap(NULL, 3791264, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0x7f20e776d000
mprotect(0x7f20e7902000, 2093056, PROT_NONE) = 0
mmap(0x7f20e7b01000, 24576, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x194000) = 0x7f20e7b01000
mmap(0x7f20e7b07000, 14752, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f20e7b07000
close(3)                                = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f20e7d0f000
arch_prctl(ARCH_SET_FS, 0x7f20e7d0f700) = 0
mprotect(0x7f20e7b01000, 16384, PROT_READ) = 0
mprotect(0x7f20e7d2d000, 4096, PROT_READ) = 0
munmap(0x7f20e7d11000, 101609)          = 0
open("test-file", O_WRONLY|O_CREAT|O_TRUNC, 0700) = 3
fallocate(3, 0, 0, 1048576)             = 0
fallocate(3, FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE, 32768, 32768) = 0
close(3)                                = 0
exit_group(0)                           = ?
+++ exited with 0 +++
<tytso at callcc> {/usr/projects/linux/ext4}   (origin)
1010% filefrag  -v test-file
Filesystem type is: ef53
File size of test-file is 1048576 (256 blocks of 4096 bytes)
 ext:     logical_offset:        physical_offset: length:   expected: flags:
   0:        0..       7:   62130432..  62130439:      8:             unwritten
   1:       16..     255:   62130448..  62130687:    240:            
last,unwritten,eof
test-file: 1 extent found

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