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authorSteffen Trumtrar2020-07-29 10:43:53 +0200
committerDenys Vlasenko2020-10-01 00:31:11 +0200
commit6561e07460acc5b38af99aa5e80283dc04953eca (patch)
treec73a8a3194c18fa52b712de4e8b3a304470725b4 /libbb/loop.c
parentabefc3c276ac2450f756c5232745a145bd14dbdf (diff)
downloadbusybox-6561e07460acc5b38af99aa5e80283dc04953eca.zip
busybox-6561e07460acc5b38af99aa5e80283dc04953eca.tar.gz
mount: support the sizelimit and offset option for loop devices
Starting with linux kernel v5.4 squashfs has a more strict parameter checking implemented. Unlike util-linux mount, busybox never supported the sizelimit option but simply forwards it to the kernel. Since v5.4 mounting will fail with squashfs: Unknown parameter 'sizelimit' Support the sizelimit parameter by setting it in the LOOP_SET_STATUS64 structure before handing it to the kernel. While at it also add support for the offset option, which currently will always be set to 0. function old new delta cut_out_ull_opt - 167 +167 singlemount 1230 1266 +36 set_loop 834 862 +28 losetup_main 479 483 +4 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 3/0 up/down: 235/0) Total: 235 bytes Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb/loop.c')
-rw-r--r--libbb/loop.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/libbb/loop.c b/libbb/loop.c
index ada0c76..85b2724 100644
--- a/libbb/loop.c
+++ b/libbb/loop.c
@@ -102,7 +102,8 @@ int FAST_FUNC get_free_loop(void)
* search will re-use an existing loop device already bound to that
* file/offset if it finds one.
*/
-int FAST_FUNC set_loop(char **device, const char *file, unsigned long long offset, unsigned flags)
+int FAST_FUNC set_loop(char **device, const char *file, unsigned long long offset,
+ unsigned long long sizelimit, unsigned flags)
{
char dev[LOOP_NAMESIZE];
char *try;
@@ -185,6 +186,7 @@ int FAST_FUNC set_loop(char **device, const char *file, unsigned long long offse
memset(&loopinfo, 0, sizeof(loopinfo));
safe_strncpy((char *)loopinfo.lo_file_name, file, LO_NAME_SIZE);
loopinfo.lo_offset = offset;
+ loopinfo.lo_sizelimit = sizelimit;
/*
* Used by mount to set LO_FLAGS_AUTOCLEAR.
* LO_FLAGS_READ_ONLY is not set because RO is controlled by open type of the file.