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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>
This commit is contained in:
Chao Yu 2016-09-05 12:28:27 +08:00 committed by Jaegeuk Kim
parent 6ab2a3085e
commit 7732c26ac3
1 changed files with 9 additions and 4 deletions
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13
fs/f2fs/namei.c
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@ -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;
}
/*