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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>
This commit is contained in:
Dan Williams 2015-09-29 15:48:11 -04:00
parent 8005c49d9a
commit ef83b6e8f4
2 changed files with 7 additions and 1 deletions
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2
fs/ext2/super.c
View File

@ -569,6 +569,8 @@ static int parse_options(char *options, struct super_block *sb)
/* Fall through */ /* Fall through */
case Opt_dax: case Opt_dax:
#ifdef CONFIG_FS_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); set_opt(sbi->s_mount_opt, DAX);
#else #else
ext2_msg(sb, KERN_INFO, "dax option not supported"); ext2_msg(sb, KERN_INFO, "dax option not supported");

6
fs/ext4/super.c
View File

@ -1664,8 +1664,12 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
} }
sbi->s_jquota_fmt = m->mount_opt; sbi->s_jquota_fmt = m->mount_opt;
#endif #endif
#ifndef CONFIG_FS_DAX
} else if (token == Opt_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"); ext4_msg(sb, KERN_INFO, "dax option not supported");
return -1; return -1;
#endif #endif