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vfs: have chdir retry lookup and call once on ESTALE error 

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Jeff Layton 2012-12-11 12:10:12 -05:00 committed by Al Viro
parent 87fa55952b
commit 0291c0a551
1 changed files with 7 additions and 2 deletions
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9
fs/open.c
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@ -394,8 +394,9 @@ SYSCALL_DEFINE1(chdir, const char __user *, filename)
{
struct path path;
int error;
error = user_path_dir(filename, &path);
unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
retry:
error = user_path_at(AT_FDCWD, filename, lookup_flags, &path);
if (error)
goto out;
@ -407,6 +408,10 @@ SYSCALL_DEFINE1(chdir, const char __user *, filename)
dput_and_out:
path_put(&path);
if (retry_estale(error, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
out:
return error;
}