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fs_parse: handle optional arguments sanely

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Don't bother with "mixed" options that would allow both the
form with and without argument (i.e. both -o foo and -o foo=bar).
Rather than trying to shove both into a single fs_parameter_spec,
allow having with-argument and no-argument specs with the same
name and teach fs_parse to handle that.

There are very few options of that sort, and they are actually
easier to handle that way - callers end up with less postprocessing.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2019-12-17 20:03:59 -05:00
parent d7167b1499
commit 48ce73b1be
5 changed files with 81 additions and 120 deletions
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1
include/linux/fs_parser.h
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@ -49,7 +49,6 @@ struct fs_parameter_spec {
u8 opt; /* Option number (returned by fs_parse()) */
enum fs_parameter_type type:8; /* The desired parameter type */
unsigned short flags;
#define fs_param_v_optional 0x0001 /* The value is optional */
#define fs_param_neg_with_no 0x0002 /* "noxxx" is negative param */
#define fs_param_neg_with_empty 0x0004 /* "xxx=" is negative param */
#define fs_param_deprecated 0x0008 /* The param is deprecated */