Re: [PATCH] ext4: Add statx support

[Andreas Dilger]

On Mar 16, 2017, at 5:35 AM, David Howells <dhowells@xxxxxxxxxx> wrote:
> 
> Return enhanced file attributes from the Ext4 filesystem.  This includes
> the following:
> 
> (1) The inode creation time (i_crtime) as stx_btime, setting STATX_BTIME.
> 
> (2) Certain FS_xxx_FL flags are mapped to stx_attribute flags.
> 
> This requires that all ext4 inodes have a getattr call, not just some of
> them, so to this end, split the ext4_getattr() function and only call part
> of it where appropriate.
> 
> Example output:
> 
> 	[root@andromeda ~]# touch foo
> 	[root@andromeda ~]# chattr +ai foo
> 	[root@andromeda ~]# /tmp/test-statx foo
> 	statx(foo) = 0
> 	results=fff
> 	  Size: 0               Blocks: 0          IO Block: 4096    regular file
> 	Device: 08:12           Inode: 2101950     Links: 1
> 	Access: (0644/-rw-r--r--)  Uid:     0   Gid:     0
> 	Access: 2016-02-11 17:08:29.031795451+0000
> 	Modify: 2016-02-11 17:08:29.031795451+0000
> 	Change: 2016-02-11 17:11:11.987790114+0000
> 	 Birth: 2016-02-11 17:08:29.031795451+0000
> 	Attributes: 0000000000000030 (-------- -------- -------- -------- -------- -------- -------- --ai----)
> 
> Signed-off-by: David Howells <dhowells@xxxxxxxxxx>

Reviewed-by: Andreas Dilger <adilger@xxxxxxxxx>

> ---
> 
> fs/ext4/ext4.h    |    1 +
> fs/ext4/file.c    |    2 +-
> fs/ext4/inode.c   |   36 +++++++++++++++++++++++++++++++++---
> fs/ext4/namei.c   |    2 ++
> fs/ext4/symlink.c |    2 ++
> 5 files changed, 39 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index f493af666591..fb69ee2388db 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -2466,6 +2466,7 @@ extern int  ext4_setattr(struct dentry *, struct iattr *);
> extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
> extern void ext4_evict_inode(struct inode *);
> extern void ext4_clear_inode(struct inode *);
> +extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);

(style) should this wrap at 80 columns?

> extern int  ext4_sync_inode(handle_t *, struct inode *);
> extern void ext4_dirty_inode(struct inode *, int);
> extern int ext4_change_inode_journal_flag(struct inode *, int);
> diff --git a/fs/ext4/file.c b/fs/ext4/file.c
> index 8210c1f43556..cefa9835f275 100644
> --- a/fs/ext4/file.c
> +++ b/fs/ext4/file.c
> @@ -744,7 +744,7 @@ const struct file_operations ext4_file_operations = {
> 
> const struct inode_operations ext4_file_inode_operations = {
> 	.setattr	= ext4_setattr,
> -	.getattr	= ext4_getattr,
> +	.getattr	= ext4_file_getattr,
> 	.listxattr	= ext4_listxattr,
> 	.get_acl	= ext4_get_acl,
> 	.set_acl	= ext4_set_acl,
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 7385e6a6b6cb..5450e1eade1d 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -5390,11 +5390,41 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
> int ext4_getattr(const struct path *path, struct kstat *stat,
> 		 u32 request_mask, unsigned int query_flags)
> {
> -	struct inode *inode;
> -	unsigned long long delalloc_blocks;
> +	struct inode *inode = d_inode(path->dentry);
> +	struct ext4_inode *raw_inode;
> +	struct ext4_inode_info *ei = EXT4_I(inode);
> +	unsigned int flags;
> +
> +	if (EXT4_FITS_IN_INODE(raw_inode, ei, i_crtime)) {
> +		stat->result_mask |= STATX_BTIME;
> +		stat->btime.tv_sec = ei->i_crtime.tv_sec;
> +		stat->btime.tv_nsec = ei->i_crtime.tv_nsec;
> +	}
> +
> +	ext4_get_inode_flags(ei);
> +	flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
> +	if (flags & EXT4_APPEND_FL)
> +		stat->attributes |= STATX_ATTR_APPEND;
> +	if (flags & EXT4_COMPR_FL)
> +		stat->attributes |= STATX_ATTR_COMPRESSED;
> +	if (flags & EXT4_ENCRYPT_FL)
> +		stat->attributes |= STATX_ATTR_ENCRYPTED;
> +	if (flags & EXT4_IMMUTABLE_FL)
> +		stat->attributes |= STATX_ATTR_IMMUTABLE;
> +	if (flags & EXT4_NODUMP_FL)
> +		stat->attributes |= STATX_ATTR_NODUMP;
> 
> -	inode = d_inode(path->dentry);
> 	generic_fillattr(inode, stat);
> +	return 0;
> +}
> +
> +int ext4_file_getattr(const struct path *path, struct kstat *stat,
> +		      u32 request_mask, unsigned int query_flags)
> +{
> +	struct inode *inode = d_inode(path->dentry);
> +	u64 delalloc_blocks;
> +
> +	ext4_getattr(path, stat, request_mask, query_flags);
> 
> 	/*
> 	 * If there is inline data in the inode, the inode will normally not
> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> index 6ad612c576fc..07e5e1405771 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -3912,6 +3912,7 @@ const struct inode_operations ext4_dir_inode_operations = {
> 	.tmpfile	= ext4_tmpfile,
> 	.rename		= ext4_rename2,
> 	.setattr	= ext4_setattr,
> +	.getattr	= ext4_getattr,
> 	.listxattr	= ext4_listxattr,
> 	.get_acl	= ext4_get_acl,
> 	.set_acl	= ext4_set_acl,
> @@ -3920,6 +3921,7 @@ const struct inode_operations ext4_dir_inode_operations = {
> 
> const struct inode_operations ext4_special_inode_operations = {
> 	.setattr	= ext4_setattr,
> +	.getattr	= ext4_getattr,
> 	.listxattr	= ext4_listxattr,
> 	.get_acl	= ext4_get_acl,
> 	.set_acl	= ext4_set_acl,
> diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
> index 73b184d161fc..4c6b23a0603e 100644
> --- a/fs/ext4/symlink.c
> +++ b/fs/ext4/symlink.c
> @@ -91,11 +91,13 @@ const struct inode_operations ext4_encrypted_symlink_inode_operations = {
> const struct inode_operations ext4_symlink_inode_operations = {
> 	.get_link	= page_get_link,
> 	.setattr	= ext4_setattr,
> +	.getattr	= ext4_getattr,
> 	.listxattr	= ext4_listxattr,
> };
> 
> const struct inode_operations ext4_fast_symlink_inode_operations = {
> 	.get_link	= simple_get_link,
> 	.setattr	= ext4_setattr,
> +	.getattr	= ext4_getattr,
> 	.listxattr	= ext4_listxattr,
> };
> 


Cheers, Andreas

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