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authorMatt Helsley <matthltc@us.ibm.com>2008-04-29 01:01:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 08:06:17 -0700
commit925d1c401fa6cfd0df5d2e37da8981494ccdec07 (patch)
tree4f3b7a09311cd99783b822350628125e44f9902d /fs/proc/internal.h
parente93b4ea20adb20f1f1f07f10ba5d7dd739d2843e (diff)
downloadop-kernel-dev-925d1c401fa6cfd0df5d2e37da8981494ccdec07.zip
op-kernel-dev-925d1c401fa6cfd0df5d2e37da8981494ccdec07.tar.gz
procfs task exe symlink
The kernel implements readlink of /proc/pid/exe by getting the file from the first executable VMA. Then the path to the file is reconstructed and reported as the result. Because of the VMA walk the code is slightly different on nommu systems. This patch avoids separate /proc/pid/exe code on nommu systems. Instead of walking the VMAs to find the first executable file-backed VMA we store a reference to the exec'd file in the mm_struct. That reference would prevent the filesystem holding the executable file from being unmounted even after unmapping the VMAs. So we track the number of VM_EXECUTABLE VMAs and drop the new reference when the last one is unmapped. This avoids pinning the mounted filesystem. [akpm@linux-foundation.org: improve comments] [yamamoto@valinux.co.jp: fix dup_mmap] Signed-off-by: Matt Helsley <matthltc@us.ibm.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: David Howells <dhowells@redhat.com> Cc:"Eric W. Biederman" <ebiederm@xmission.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc/internal.h')
-rw-r--r--fs/proc/internal.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index bc72f5c..45abb98 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -48,7 +48,6 @@ extern int maps_protect;
extern void create_seq_entry(char *name, mode_t mode,
const struct file_operations *f);
-extern int proc_exe_link(struct inode *, struct path *);
extern int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task);
extern int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
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