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    SubjectRe: linux-2.6.25: 'mkdir -p' does not work with rootdir as mount point inside a read only filesystem
    On Mon, May 05, 2008 at 08:27:57AM +0200, Lothar Waßmann wrote:
    > I'm using busybox 1.0 (on an embedded PXA320 system).

    OK

    > > stat64("/dev/a/b/c", 0xbf9175dc) = -1 ENOENT (No such file or directory)
    > > umask(0) = 022
    > > open(".", O_RDONLY|O_LARGEFILE|O_DIRECTORY) = 3
    > > chdir("/") = 0
    > > mkdir("dev", 0755) = -1 EEXIST (File exists)
    > > stat64("dev", {st_mode=S_IFDIR|0755, st_size=17080, ...}) = 0
    > > chdir("dev") = 0
    > > mkdir("a", 0755) = 0
    > > chdir("a") = 0
    > > mkdir("b", 0755) = 0
    > > chdir("b") = 0
    > > umask(022) = 0
    > > mkdir("c", 0777) = 0
    > > fchdir(3) = 0
    > > close(3) = 0
    > >
    > This is what strace shows in my case:
    > mkdir("/", 0777) = -1 EEXIST (File exists)
    > stat64("/", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
    > mkdir("/dev/", 0777) = -1 EROFS (Read-only file system)
    > umask(022) = 022
    > write(2, "mkdir: ", 7mkdir: ) = 7
    > write(2, "Cannot create directory `/dev/\'", 31Cannot create directory `/dev/') = 31
    > write(2, ": Read-only file system\n", 24: Read-only file system
    > ) = 24
    > io_submit(0x1, 0x1, 0xfbad2088 <unfinished ... exit status 1>

    So you should send this trace to the busybox maintainer. It
    obviously exhibits a small but easily fixable bug in the
    program ; it should check whether the directory exists in
    case of error. It seems it only checks for EEXIST.

    What puzzles me is why you have this problem only with a new kernel.
    I suspect that previous ones did report EEXIST and now we report
    EROFS for an existing directory on an ro fs.

    Willy

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