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btrfs: add helper for string match ignoring leading/trailing whitespace

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Add a generic helper to match the string in a given buffer, and ignore
the leading and trailing whitespace.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ rename variables, add comments ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2020-10-28 21:14:45 +08:00 committed by David Sterba
parent 88090ad36a
commit aaefed2078
1 changed files with 19 additions and 0 deletions
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19
fs/btrfs/sysfs.c
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@ -888,6 +888,25 @@ static ssize_t btrfs_generation_show(struct kobject *kobj,
}
BTRFS_ATTR(, generation, btrfs_generation_show);
/*
* Look for an exact string @string in @buffer with possible leading or
* trailing whitespace
*/
static bool strmatch(const char *buffer, const char *string)
{
const size_t len = strlen(string);
/* Skip leading whitespace */
buffer = skip_spaces(buffer);
/* Match entire string, check if the rest is whitespace or empty */
if (strncmp(string, buffer, len) == 0 &&
strlen(skip_spaces(buffer + len)) == 0)
return true;
return false;
}
static const struct attribute *btrfs_attrs[] = {
BTRFS_ATTR_PTR(, label),
BTRFS_ATTR_PTR(, nodesize),