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authorDan Williams <dan.j.williams@intel.com>2015-09-29 15:48:11 -0400
committerDan Williams <dan.j.williams@intel.com>2015-11-16 09:43:54 -0800
commitef83b6e8f40bb24b92ad73b5889732346e54a793 (patch)
tree06d073d15242055b42c3621b6a34fdcdaf9c61ed /fs
parentLinux 4.4-rc1 (diff)
downloadlinux-dev-ef83b6e8f40bb24b92ad73b5889732346e54a793.tar.xz
linux-dev-ef83b6e8f40bb24b92ad73b5889732346e54a793.zip
ext2, ext4: warn when mounting with dax enabled
Similar to XFS warn when mounting DAX while it is still considered under development. Also, aspects of the DAX implementation, for example synchronization against multiple faults and faults causing block allocation, depend on the correct implementation in the filesystem. The maturity of a given DAX implementation is filesystem specific. Cc: <stable@vger.kernel.org> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Matthew Wilcox <willy@linux.intel.com> Cc: linux-ext4@vger.kernel.org Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reported-by: Dave Chinner <david@fromorbit.com> Acked-by: Jan Kara <jack@suse.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext2/super.c2
-rw-r--r--fs/ext4/super.c6
2 files changed, 7 insertions, 1 deletions
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 3a71cea68420..748d35afc902 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -569,6 +569,8 @@ static int parse_options(char *options, struct super_block *sb)
/* Fall through */
case Opt_dax:
#ifdef CONFIG_FS_DAX
+ ext2_msg(sb, KERN_WARNING,
+ "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
set_opt(sbi->s_mount_opt, DAX);
#else
ext2_msg(sb, KERN_INFO, "dax option not supported");
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 753f4e68b820..c9ab67da6e5a 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1664,8 +1664,12 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
}
sbi->s_jquota_fmt = m->mount_opt;
#endif
-#ifndef CONFIG_FS_DAX
} else if (token == Opt_dax) {
+#ifdef CONFIG_FS_DAX
+ ext4_msg(sb, KERN_WARNING,
+ "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
+ sbi->s_mount_opt |= m->mount_opt;
+#else
ext4_msg(sb, KERN_INFO, "dax option not supported");
return -1;
#endif