From: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
Subject: [PATCH] hfsplus: fix remount issue
Current implementation of HFS+ driver has small issue
with remount option. Namely, for example, you are
unable to remount from RO mode into RW mode by means
of command "mount -o remount,rw /dev/loop0 /mnt/hfsplus".
Trying to execute sequence of commands is resulted
with error message:
mount /dev/loop0 /mnt/hfsplus
mount -o remount,ro /dev/loop0 /mnt/hfsplus
mount -o remount,rw /dev/loop0 /mnt/hfsplus
mount: you must specify the filesystem type
mount -t hfsplus -o remount,rw /dev/loop0 /mnt/hfsplus
mount: /mnt/hfsplus not mounted or bad option
The reason of such issue is failure of mount syscall:
mount("/dev/loop0", "/mnt/hfsplus", 0x2282a60, MS_MGC_VAL|MS_REMOUNT, NULL) = -1 EINVAL (Invalid argument)
Namely, hfsplus_parse_options_remount() method receives
empty "input" argument and return false in such case.
As a result, hfsplus_remount() returns -EINVAL error
code.
This patch fixes the issue by means of return true
for the case of empty "input" argument in
hfsplus_parse_options_remount() method.
Signed-off-by: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
CC: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
CC: Christoph Hellwig <hch@xxxxxxxxxxxxx>
---
fs/hfsplus/options.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/hfsplus/options.c b/fs/hfsplus/options.c
index 4ad835e..60829cd 100644
--- a/fs/hfsplus/options.c
+++ b/fs/hfsplus/options.c
@@ -76,7 +76,7 @@ int hfsplus_parse_options_remount(char *input, struct hfsplus_sb_info *sbi)
int token;
if (!input)
- return 0;
+ return 1;
while ((p = strsep(&input, ",")) != NULL) {
if (!*p)
--
1.7.9.5
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