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Message-Id: <E2F29C99-0A2F-4F97-AC1E-863F4821CFB3@dilger.ca>
Date: Thu, 16 Mar 2017 15:46:20 -0600
From: Andreas Dilger <adilger@...ger.ca>
To: David Howells <dhowells@...hat.com>
Cc: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext4: Add statx support
On Mar 16, 2017, at 5:35 AM, David Howells <dhowells@...hat.com> 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@...romeda ~]# touch foo
> [root@...romeda ~]# chattr +ai foo
> [root@...romeda ~]# /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@...hat.com>
Reviewed-by: Andreas Dilger <adilger@...ger.ca>
> ---
>
> 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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