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Add an AT_NO_AUTOMOUNT flag to suppress terminal automount

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Add an AT_NO_AUTOMOUNT flag to suppress terminal automounting of automount
point directories.  This can be used by fstatat() users to permit the
gathering of attributes on an automount point and also prevent
mass-automounting of a directory of automount points by ls.

Signed-off-by: David Howells <[email protected]>
Acked-by: Ian Kent <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
David Howells 2011-01-14 18:45:31 +00:00 • committed by Al Viro
commit 6f45b65672
4 changed files with 12 additions and 1 deletions
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4
fs/stat.c
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@ -75,11 +75,13 @@ int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
int error = -EINVAL;
int lookup_flags = 0;
if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT)) != 0)
goto out;
if (!(flag & AT_SYMLINK_NOFOLLOW))
lookup_flags |= LOOKUP_FOLLOW;
if (flag & AT_NO_AUTOMOUNT)
lookup_flags |= LOOKUP_NO_AUTOMOUNT;
error = user_path_at(dfd, filename, lookup_flags, &path);
if (error)