Commit 7732c26a authored Sep 05, 2016 by Chao Yu Committed by Jaegeuk Kim Sep 07, 2016

f2fs: fix to detect temporary name of multimedia file



Some applications may create multimeida file with temporary name like
'*.jpg.tmp' or '*.mp4.tmp', then rename to '*.jpg' or '*.mp4'.

Now, f2fs can only detect multimedia filename with specified format:
"filename + '.' + extension", so it will make f2fs missing to detect
multimedia file with special temporary name, result in failing to set
cold flag on file.

This patch enhances detection flow for enabling lookup extension in the
middle of temporary filename.

Reported-by: Xue Liu <liuxueliu.liu@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent 6ab2a308

fs/f2fs/namei.c

+9 −4

Original line number	Diff line number	Diff line
		@@ -91,18 +91,23 @@ static int is_multimedia_file(const unsigned char s, const char sub)
		{
		size_t slen = strlen(s);
		size_t sublen = strlen(sub);
		int i;

		/*
		* filename format of multimedia file should be defined as:
		* "filename + '.' + extension".
		* "filename + '.' + extension + (optional: '.' + temp extension)".
		*/
		if (slen < sublen + 2)
		return 0;

		if (s[slen - sublen - 1] != '.')
		return 0;
		for (i = 1; i < slen - sublen; i++) {
		if (s[i] != '.')
		continue;
		if (!strncasecmp(s + i + 1, sub, sublen))
		return 1;
		}

		return !strncasecmp(s + slen - sublen, sub, sublen);
		return 0;
		}

		/*

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