From 923ae0ff9250430133b3310fe62c47538cf1cbc1 Mon Sep 17 00:00:00 2001 From: Ross Zwisler Date: Mon, 16 Feb 2015 15:59:38 -0800 Subject: ext4: add DAX functionality This is a port of the DAX functionality found in the current version of ext2. [matthew.r.wilcox@intel.com: heavily tweaked] [akpm@linux-foundation.org: remap_pages went away] Signed-off-by: Ross Zwisler Reviewed-by: Andreas Dilger Signed-off-by: Matthew Wilcox Cc: Boaz Harrosh Cc: Christoph Hellwig Cc: Dave Chinner Cc: Jan Kara Cc: Jens Axboe Cc: Kirill A. Shutemov Cc: Mathieu Desnoyers Cc: Randy Dunlap Cc: Theodore Ts'o Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ext4/ext4.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'fs/ext4/ext4.h') diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index a75fba67bb1f..982d934fd9ac 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -965,6 +965,11 @@ struct ext4_inode_info { #define EXT4_MOUNT_ERRORS_MASK 0x00070 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ +#ifdef CONFIG_FS_DAX +#define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ +#else +#define EXT4_MOUNT_DAX 0 +#endif #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ @@ -2578,6 +2583,7 @@ extern const struct file_operations ext4_dir_operations; /* file.c */ extern const struct inode_operations ext4_file_inode_operations; extern const struct file_operations ext4_file_operations; +extern const struct file_operations ext4_dax_file_operations; extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); /* inline.c */ -- cgit v1.2.3