summarylogtreecommitdiffstats
path: root/0003-Linux-4.2-total_link_count-is-no-longer-accessible.patch
diff options
context:
space:
mode:
Diffstat (limited to '0003-Linux-4.2-total_link_count-is-no-longer-accessible.patch')
-rw-r--r--0003-Linux-4.2-total_link_count-is-no-longer-accessible.patch69
1 files changed, 69 insertions, 0 deletions
diff --git a/0003-Linux-4.2-total_link_count-is-no-longer-accessible.patch b/0003-Linux-4.2-total_link_count-is-no-longer-accessible.patch
new file mode 100644
index 00000000000..62c70e1961d
--- /dev/null
+++ b/0003-Linux-4.2-total_link_count-is-no-longer-accessible.patch
@@ -0,0 +1,69 @@
+From e123ace58e2c574cd2eb50ec28f8fe616f9ca69d Mon Sep 17 00:00:00 2001
+From: Marc Dionne <marc.dionne@your-file-system.com>
+Date: Mon, 6 Jul 2015 11:00:13 -0300
+Subject: [PATCH 3/6] Linux 4.2: total_link_count is no longer accessible
+
+The value is now stored in the nameidata structure which
+is private to fs/namei.c, so we can't modify it here.
+
+The effect is that using a path that contains 40+ directories
+may fail with ELOOP, depending on which directories in the
+path were previously used. After a directory is accessed once
+its D_AUTOMOUNT flag is reset and it will no longer count
+against the symlink limit in later path lookups.
+
+Reviewed-on: http://gerrit.openafs.org/11926
+Tested-by: BuildBot <buildbot@rampaginggeek.com>
+Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
+(cherry picked from commit 89aeb71a3e23c944f58cfa9572e9eae4d2130d37)
+
+Change-Id: Ib6282f3029c4112c510217eacf270a56d679fccd
+Reviewed-on: http://gerrit.openafs.org/11949
+Tested-by: BuildBot <buildbot@rampaginggeek.com>
+Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
+Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
+(cherry picked from commit 2e5ba7e16c6797a39323173ce17a1db698526c2c)
+---
+ acinclude.m4 | 1 +
+ src/afs/LINUX/osi_vnodeops.c | 12 ++++++++++--
+ 2 files changed, 11 insertions(+), 2 deletions(-)
+
+diff --git a/acinclude.m4 b/acinclude.m4
+index a99592a..c924d90 100644
+--- a/acinclude.m4
++++ b/acinclude.m4
+@@ -902,6 +902,7 @@ case $AFS_SYSNAME in *_linux* | *_umlinux*)
+ AC_CHECK_LINUX_STRUCT([task_struct], [sigmask_lock], [sched.h])
+ AC_CHECK_LINUX_STRUCT([task_struct], [tgid], [sched.h])
+ AC_CHECK_LINUX_STRUCT([task_struct], [thread_info], [sched.h])
++ AC_CHECK_LINUX_STRUCT([task_struct], [total_link_count], [sched.h])
+ LINUX_SCHED_STRUCT_TASK_STRUCT_HAS_SIGNAL_RLIM
+
+ dnl Check for typed structure elements
+diff --git a/src/afs/LINUX/osi_vnodeops.c b/src/afs/LINUX/osi_vnodeops.c
+index a8f0074..a878eb4 100644
+--- a/src/afs/LINUX/osi_vnodeops.c
++++ b/src/afs/LINUX/osi_vnodeops.c
+@@ -1385,9 +1385,17 @@ afs_dentry_automount(afs_linux_path_t *path)
+ {
+ struct dentry *target;
+
+- /* avoid symlink resolution limits when resolving; we cannot contribute to
+- * an infinite symlink loop */
++ /*
++ * Avoid symlink resolution limits when resolving; we cannot contribute to
++ * an infinite symlink loop.
++ *
++ * On newer kernels the field has moved to the private nameidata structure
++ * so we can't adjust it here. This may cause ELOOP when using a path with
++ * 40 or more directories that are not already in the dentry cache.
++ */
++#if defined(STRUCT_TASK_STRUCT_HAS_TOTAL_LINK_COUNT)
+ current->total_link_count--;
++#endif
+
+ target = canonical_dentry(path->dentry->d_inode);
+
+--
+2.5.1
+