On 05/12/2013 02:08 PM, Ivana Varekova wrote:
> Seems ok for me, Jan could you look at it pleas?
> Ivana
>
> ----- Original Message -----
>> From: "Peter Schiffer" <pschi...@redhat.com>
>> To: libcg-devel@lists.sourceforge.net
>> Sent: Monday, February 11, 2013 6:09:02 PM
>> Subject: [Libcg-devel] [PATCH] Make cg_mkdir_p() function compatible with
>> read-only fs
>>
>> mkdir(2) function returns EROFS error even when the path already exists on
>> the
>> read only file system, so it is impossible to determine whether the path
>> already
>> exists on this kind of fs only be return code from the mkdir(2). To make
>> cg_mkdir_p() compatible with the ro fs, the function checks whether the path
>> exists with stat(2) before trying to create it.
>>
>> Signed-off-by: Peter Schiffer <pschi...@redhat.com>
>> ---
>> 0 files changed
>>
>> diff --git a/src/api.c b/src/api.c
>> index 11cd1b4..4acdc30 100644
>> --- a/src/api.c
>> +++ b/src/api.c
>> @@ -1271,6 +1271,7 @@ int cg_mkdir_p(const char *path)
>> int i = 0;
>> char pos;
>> int ret = 0;
>> + struct stat st;
>>
>> real_path = strdup(path);
>> if (!real_path) {
>> @@ -1287,6 +1288,10 @@ int cg_mkdir_p(const char *path)
>> i++;
>> pos = real_path[i];
>> real_path[i] = '\0'; /* Temporarily overwrite "/" */
>> + if (stat(real_path, &st) == 0) { /* Continue if
>> dir exists */
>> + real_path[i] = pos;
>> + continue;
>> + }
I think this code is racy. There can be a change between stat() and
mkdir(). Shouldn't mkdir() return EEXIST is the directory already
exists? Please check/test it. If it still returns EROFS in this case,
then I ack this patch, there is no other way how to do it.
>> ret = mkdir(real_path, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
>> real_path[i] = pos;
>> if (ret) {
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