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Linux 4.2: total_link_count is no longer accessible

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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.

Change-Id: I90e4cb0e9004b075bff2330d165c67b7a923193f
Reviewed-on: http://gerrit.openafs.org/11926
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
This commit is contained in:
Marc Dionne 2015-07-06 11:00:13 -03:00 committed by Jeffrey Altman
parent e597b87967
commit 89aeb71a3e
2 changed files with 11 additions and 2 deletions
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1
acinclude.m4
View File

@ -958,6 +958,7 @@ 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

12
src/afs/LINUX/osi_vnodeops.c
View File

@ -1390,9 +1390,17 @@ 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);