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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 results in an
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@dubeyko.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
bd2c003532