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Date: Thu, 16 Oct 2014 14:32:53 +0200
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Matthew Wilcox <matthew.r.wilcox@...el.com>
Cc: linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 18/21] ext2: Get rid of most mentions of XIP in ext2
On 25-Sep-2014 04:33:35 PM, Matthew Wilcox wrote:
> To help people transition, accept the 'xip' mount option (and report it
> in /proc/mounts), but print a message encouraging people to switch over
> to the 'dax' option.
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> ---
> fs/ext2/ext2.h | 13 +++++++------
> fs/ext2/file.c | 2 +-
> fs/ext2/inode.c | 6 +++---
> fs/ext2/namei.c | 8 ++++----
> fs/ext2/super.c | 25 ++++++++++++++++---------
> 5 files changed, 31 insertions(+), 23 deletions(-)
>
> diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
> index b8b1c11..46133a0 100644
> --- a/fs/ext2/ext2.h
> +++ b/fs/ext2/ext2.h
> @@ -380,14 +380,15 @@ struct ext2_inode {
> #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
> #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */
> #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */
> -#ifdef CONFIG_FS_DAX
> -#define EXT2_MOUNT_XIP 0x010000 /* Execute in place */
> -#else
> -#define EXT2_MOUNT_XIP 0
> -#endif
> +#define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */
> #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
> #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
> #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */
> +#ifdef CONFIG_FS_DAX
> +#define EXT2_MOUNT_DAX 0x100000 /* Direct Access */
> +#else
> +#define EXT2_MOUNT_DAX 0
> +#endif
>
>
> #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
> @@ -789,7 +790,7 @@ extern int ext2_fsync(struct file *file, loff_t start, loff_t end,
> int datasync);
> extern const struct inode_operations ext2_file_inode_operations;
> extern const struct file_operations ext2_file_operations;
> -extern const struct file_operations ext2_xip_file_operations;
> +extern const struct file_operations ext2_dax_file_operations;
>
> /* inode.c */
> extern const struct address_space_operations ext2_aops;
> diff --git a/fs/ext2/file.c b/fs/ext2/file.c
> index 46b333d..5b8cab5 100644
> --- a/fs/ext2/file.c
> +++ b/fs/ext2/file.c
> @@ -110,7 +110,7 @@ const struct file_operations ext2_file_operations = {
> };
>
> #ifdef CONFIG_FS_DAX
> -const struct file_operations ext2_xip_file_operations = {
> +const struct file_operations ext2_dax_file_operations = {
> .llseek = generic_file_llseek,
> .read = new_sync_read,
> .write = new_sync_write,
> diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
> index 034fd42..6434bc0 100644
> --- a/fs/ext2/inode.c
> +++ b/fs/ext2/inode.c
> @@ -1286,7 +1286,7 @@ 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))
> + if (test_opt(inode->i_sb, DAX))
> inode->i_flags |= S_DAX;
> }
>
> @@ -1388,9 +1388,9 @@ struct inode *ext2_iget (struct super_block *sb, unsigned long ino)
>
> if (S_ISREG(inode->i_mode)) {
> inode->i_op = &ext2_file_inode_operations;
> - if (test_opt(inode->i_sb, XIP)) {
> + if (test_opt(inode->i_sb, DAX)) {
> inode->i_mapping->a_ops = &ext2_aops;
> - inode->i_fop = &ext2_xip_file_operations;
> + inode->i_fop = &ext2_dax_file_operations;
> } else if (test_opt(inode->i_sb, NOBH)) {
> inode->i_mapping->a_ops = &ext2_nobh_aops;
> inode->i_fop = &ext2_file_operations;
> diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
> index 0db888c..148f6e3 100644
> --- a/fs/ext2/namei.c
> +++ b/fs/ext2/namei.c
> @@ -104,9 +104,9 @@ static int ext2_create (struct inode * dir, struct dentry * dentry, umode_t mode
> return PTR_ERR(inode);
>
> inode->i_op = &ext2_file_inode_operations;
> - if (test_opt(inode->i_sb, XIP)) {
> + if (test_opt(inode->i_sb, DAX)) {
> inode->i_mapping->a_ops = &ext2_aops;
> - inode->i_fop = &ext2_xip_file_operations;
> + inode->i_fop = &ext2_dax_file_operations;
> } else if (test_opt(inode->i_sb, NOBH)) {
> inode->i_mapping->a_ops = &ext2_nobh_aops;
> inode->i_fop = &ext2_file_operations;
> @@ -125,9 +125,9 @@ static int ext2_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
> return PTR_ERR(inode);
>
> inode->i_op = &ext2_file_inode_operations;
> - if (test_opt(inode->i_sb, XIP)) {
> + if (test_opt(inode->i_sb, DAX)) {
> inode->i_mapping->a_ops = &ext2_aops;
> - inode->i_fop = &ext2_xip_file_operations;
> + inode->i_fop = &ext2_dax_file_operations;
> } else if (test_opt(inode->i_sb, NOBH)) {
> inode->i_mapping->a_ops = &ext2_nobh_aops;
> inode->i_fop = &ext2_file_operations;
> diff --git a/fs/ext2/super.c b/fs/ext2/super.c
> index feb53d8..8b9debf 100644
> --- a/fs/ext2/super.c
> +++ b/fs/ext2/super.c
> @@ -290,6 +290,8 @@ static int ext2_show_options(struct seq_file *seq, struct dentry *root)
> #ifdef CONFIG_FS_DAX
> if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
> seq_puts(seq, ",xip");
> + if (sbi->s_mount_opt & EXT2_MOUNT_DAX)
> + seq_puts(seq, ",dax");
> #endif
>
> if (!test_opt(sb, RESERVATION))
> @@ -393,7 +395,7 @@ enum {
> Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
> Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
> Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
> - Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
> + Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota,
> Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
> };
>
> @@ -422,6 +424,7 @@ static const match_table_t tokens = {
> {Opt_acl, "acl"},
> {Opt_noacl, "noacl"},
> {Opt_xip, "xip"},
> + {Opt_dax, "dax"},
> {Opt_grpquota, "grpquota"},
> {Opt_ignore, "noquota"},
> {Opt_quota, "quota"},
> @@ -549,10 +552,14 @@ static int parse_options(char *options, struct super_block *sb)
> break;
> #endif
> case Opt_xip:
> + ext2_msg(sb, KERN_INFO, "use dax instead of xip");
> + set_opt(sbi->s_mount_opt, XIP);
> + /* Fall through */
> + case Opt_dax:
> #ifdef CONFIG_FS_DAX
> - set_opt (sbi->s_mount_opt, XIP);
> + set_opt(sbi->s_mount_opt, DAX);
> #else
> - ext2_msg(sb, KERN_INFO, "xip option not supported");
> + ext2_msg(sb, KERN_INFO, "dax option not supported");
> #endif
> break;
>
> @@ -896,15 +903,15 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
>
> blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
>
> - if (sbi->s_mount_opt & EXT2_MOUNT_XIP) {
> + if (sbi->s_mount_opt & EXT2_MOUNT_DAX) {
> if (blocksize != PAGE_SIZE) {
> ext2_msg(sb, KERN_ERR,
> - "error: unsupported blocksize for xip");
> + "error: unsupported blocksize for dax");
> goto failed_mount;
> }
> if (!sb->s_bdev->bd_disk->fops->direct_access) {
> ext2_msg(sb, KERN_ERR,
> - "error: device does not support xip");
> + "error: device does not support dax");
> goto failed_mount;
> }
> }
> @@ -1276,10 +1283,10 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
> ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
>
> es = sbi->s_es;
> - if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT2_MOUNT_XIP) {
> + if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
> ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
> - "xip flag with busy inodes while remounting");
> - sbi->s_mount_opt ^= EXT2_MOUNT_XIP;
> + "dax flag with busy inodes while remounting");
> + sbi->s_mount_opt ^= EXT2_MOUNT_DAX;
> }
> if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
> spin_unlock(&sbi->s_lock);
> --
> 2.1.0
>
> --
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>
>
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
Key fingerprint: 2A0B 4ED9 15F2 D3FA 45F5 B162 1728 0A97 8118 6ACF
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