busybox.git/util-linux/mount.c, branch master

Update applet size estimates

2023-07-10T15:25:21+00:00

Signed-off-by: Denys Vlasenko

Remove "select PLATFORM_LINUX"

2022-11-29T13:14:06+00:00

Signed-off-by: Denys Vlasenko

Fix non-Linux builds

2022-11-29T13:10:22+00:00

Various tools are Linuxish and should thus only attempted to build on
Linux only. Some features are also Linux-only.

Also, libresolv is used on all GNU platforms, notably GNU/Hurd and
GNU/kfreeBSD.

Signed-off-by: Samuel Thibault 
Signed-off-by: Denys Vlasenko

mount: "mount -o rw ...." should not fall back to RO mount

2021-10-08T00:20:10+00:00

The reported case was an attempt to remount,rw a CD-ROM:

  mount -o remount,rw /mnt/sr0

which "succeeded" by falling back to RO:

  mount("/dev/sr0", "/mnt/sr0", 0x412862, MS_REMOUNT|MS_SILENT|MS_RELATIME, "nojoliet,check=s,map=n,blocksize"...) = -1 EROFS (Read-only file system)
  ...
  mount("/dev/sr0", "/mnt/sr0", 0x412862, MS_RDONLY|MS_REMOUNT|MS_SILENT|MS_RELATIME, "nojoliet,check=s,map=n,blocksize"...) = 0

Clearly, not what was intended!

function                                             old     new   delta
parse_mount_options                                  241     267     +26
mount_main                                          1198    1211     +13
singlemount                                         1301    1313     +12
inetd_main                                          1919    1911      -8
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/1 up/down: 51/-8)              Total: 43 bytes

Signed-off-by: Denys Vlasenko

mount: code shrink

2021-08-23T00:31:26+00:00

function                                             old     new   delta
append_mount_options                                 174     157     -17

Signed-off-by: Denys Vlasenko

mount: with -w, do not fall back to read-only mounts

2021-08-23T00:30:13+00:00

function                                             old     new   delta
mount_it_now                                         364     358      -6

Signed-off-by: Denys Vlasenko

mount: Surround syslog.h with the config check

2020-12-25T17:15:37+00:00

This lets bb mount build for limited targets without syslog.h,
as long as the parts using it like NFS are disabled.

Signed-off-by: Lauri Kasanen 
Signed-off-by: Denys Vlasenko

mount: fix incorrect "success" exitcode if loop device setup fails

2020-12-09T19:56:43+00:00

When mounting, in parallel, multiple loop devices (squashfs for the
submitter's case), the following behavior can be observed:

stat64(/path/to/image, {st_mode=S_IFREG|0644, st_size=4096, ...}) = 0
openat(AT_FDCWD, /path/to/image, O_RDWR|O_LARGEFILE) = 3
openat(AT_FDCWD, /dev/loop-control, O_RDWR|O_LARGEFILE|O_CLOEXEC) = 4
ioctl(4, LOOP_CTL_GET_FREE)             = 12
close(4)                                = 0
openat(AT_FDCWD, /dev/loop12, O_RDWR|O_LARGEFILE) = 4
ioctl(4, LOOP_GET_STATUS64, {lo_offset=0, lo_number=12, lo_flags=LO_FLAGS_AUTOCLEAR, lo_file_name=/path/to/image, ...}) = 0
close(4)                                = 0
close(3)                                = 0
write(2, "mount: can't setup loop device\n", 31mount: can't setup loop device
) = 31
exit_group(0)                           = ?
+++ exited with 0 +++

The ioctl LOOP_CTL_GET_FREE has resulted in the same result for
a competing mount process. The subsequent ioctl LOOP_GET_STATUS64
fails, having succeeded for the competing mount process.

Signed-off-by: Denys Vlasenko

mount: implement -o nosymfollow, remove bogus -o union

2020-12-06T20:56:22+00:00

The (1 << 8) MS_ flag is MS_NOSYMFOLLOW, not MS_UNION.
As far as I see in git history of kernel and util-linux,
MS_UNION did not ever exist.
Why did it appear in our tree in 2009?...

function                                             old     new   delta
mount_option_str                                     379     385      +6

Signed-off-by: Denys Vlasenko

mount: add -o nostrictatime and -o [no]lazytime

2020-12-06T19:59:41+00:00

function                                             old     new   delta
mount_option_str                                     345     379     +34
mount_options                                        176     188     +12
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 46/0)               Total: 46 bytes

Signed-off-by: Denys Vlasenko