diff options
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.patch | 69 |
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 000000000000..62c70e1961df --- /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 + |