On Sun 23-03-14 15:08:31, Matthew Wilcox wrote:
> Use an inode flag to tag inodes which should avoid using the page cache.
> Convert ext2 to use it instead of mapping_is_xip().
The patch looks good. You can add:
Reviewed-by: Jan Kara <jack@xxxxxxx>
Honza
>
> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx>
> ---
> fs/ext2/inode.c | 9 ++++++---
> fs/ext2/xip.h | 2 --
> include/linux/fs.h | 6 ++++++
> 3 files changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
> index 94ed3684..e7d3192 100644
> --- a/fs/ext2/inode.c
> +++ b/fs/ext2/inode.c
> @@ -731,7 +731,7 @@ static int ext2_get_blocks(struct inode *inode,
> goto cleanup;
> }
>
> - if (ext2_use_xip(inode->i_sb)) {
> + if (IS_DAX(inode)) {
> /*
> * we need to clear the block
> */
> @@ -1201,7 +1201,7 @@ static int ext2_setsize(struct inode *inode, loff_t newsize)
>
> inode_dio_wait(inode);
>
> - if (mapping_is_xip(inode->i_mapping))
> + if (IS_DAX(inode))
> error = xip_truncate_page(inode->i_mapping, newsize);
> else if (test_opt(inode->i_sb, NOBH))
> error = nobh_truncate_page(inode->i_mapping,
> @@ -1273,7 +1273,8 @@ void ext2_set_inode_flags(struct inode *inode)
> {
> unsigned int flags = EXT2_I(inode)->i_flags;
>
> - inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
> + inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
> + S_DIRSYNC | S_DAX);
> if (flags & EXT2_SYNC_FL)
> inode->i_flags |= S_SYNC;
> if (flags & EXT2_APPEND_FL)
> @@ -1284,6 +1285,8 @@ void ext2_set_inode_flags(struct inode *inode)
> inode->i_flags |= S_NOATIME;
> if (flags & EXT2_DIRSYNC_FL)
> inode->i_flags |= S_DIRSYNC;
> + if (test_opt(inode->i_sb, XIP))
> + inode->i_flags |= S_DAX;
> }
>
> /* Propagate flags from i_flags to EXT2_I(inode)->i_flags */
> diff --git a/fs/ext2/xip.h b/fs/ext2/xip.h
> index 18b34d2..29be737 100644
> --- a/fs/ext2/xip.h
> +++ b/fs/ext2/xip.h
> @@ -16,9 +16,7 @@ static inline int ext2_use_xip (struct super_block *sb)
> }
> int ext2_get_xip_mem(struct address_space *, pgoff_t, int,
> void **, unsigned long *);
> -#define mapping_is_xip(map) unlikely(map->a_ops->get_xip_mem)
> #else
> -#define mapping_is_xip(map) 0
> #define ext2_xip_verify_sb(sb) do { } while (0)
> #define ext2_use_xip(sb) 0
> #define ext2_clear_xip_target(inode, chain) 0
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 23b2a35..47fd219 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -1644,6 +1644,7 @@ struct super_operations {
> #define S_IMA 1024 /* Inode has an associated IMA struct */
> #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
> #define S_NOSEC 4096 /* no suid or xattr security attributes */
> +#define S_DAX 8192 /* Direct Access, avoiding the page cache */
>
> /*
> * Note that nosuid etc flags are inode-specific: setting some file-system
> @@ -1681,6 +1682,11 @@ struct super_operations {
> #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
> #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
> #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
> +#ifdef CONFIG_FS_XIP
> +#define IS_DAX(inode) ((inode)->i_flags & S_DAX)
> +#else
> +#define IS_DAX(inode) 0
> +#endif
>
> /*
> * Inode state bits. Protected by inode->i_lock
> --
> 1.9.0
>
> --
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--
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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