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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 2/4] statx: Ext4: Return enhanced file attributes From: David Howells To: linux-fsdevel@vger.kernel.org Cc: dhowells@redhat.com, linux-kernel@vger.kernel.org Date: Thu, 17 Nov 2016 13:35:11 +0000 Message-ID: <147938971095.13574.11430139440468763433.stgit@warthog.procyon.org.uk> In-Reply-To: <147938969703.13574.10295364502230379833.stgit@warthog.procyon.org.uk> References: <147938969703.13574.10295364502230379833.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Thu, 17 Nov 2016 13:35:12 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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) The inode i_version as stx_version if a file with I_VERSION set or a directory, setting STATX_VERSION. (3) Certain FS_xxx_FL flags are copied 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----) IO-blocksize: blksize=4096 Signed-off-by: David Howells --- fs/ext4/ext4.h | 2 ++ fs/ext4/file.c | 2 +- fs/ext4/inode.c | 38 +++++++++++++++++++++++++++++++++++--- fs/ext4/namei.c | 2 ++ fs/ext4/symlink.c | 2 ++ 5 files changed, 42 insertions(+), 4 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 282a51b07c57..f65e4a560c4c 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2485,6 +2485,8 @@ extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat); extern void ext4_evict_inode(struct inode *); extern void ext4_clear_inode(struct inode *); +extern int ext4_file_getattr(struct vfsmount *mnt, struct dentry *dentry, + struct kstat *stat); 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 2a822d30e73f..20bab4b0d6fc 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -705,7 +705,7 @@ 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 9c064727ed62..91a49cbc4c63 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5229,11 +5229,43 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) { - struct inode *inode; - unsigned long long delalloc_blocks; + struct inode *inode = d_inode(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; + } + + if (S_ISDIR(inode->i_mode) || IS_I_VERSION(inode)) { + stat->result_mask |= STATX_VERSION; + stat->version = inode->i_version; + } + + ext4_get_inode_flags(ei); + flags = ei->i_flags & EXT4_FL_USER_VISIBLE; + stat->attributes |= flags & (EXT4_IMMUTABLE_FL | EXT4_NODUMP_FL); + 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; - inode = d_inode(dentry); generic_fillattr(inode, stat); + return 0; +} + +int ext4_file_getattr(struct vfsmount *mnt, struct dentry *dentry, + struct kstat *stat) +{ + struct inode *inode = dentry->d_inode; + u64 delalloc_blocks; + + ext4_getattr(mnt, dentry, stat); /* * 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 104f8bfba718..e115281fb8c5 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -3882,6 +3882,7 @@ 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, @@ -3890,6 +3891,7 @@ 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 557b3b0d668c..209b833633e2 100644 --- a/fs/ext4/symlink.c +++ b/fs/ext4/symlink.c @@ -93,6 +93,7 @@ const struct inode_operations ext4_symlink_inode_operations = { .readlink = generic_readlink, .get_link = page_get_link, .setattr = ext4_setattr, + .getattr = ext4_getattr, .listxattr = ext4_listxattr, }; @@ -100,5 +101,6 @@ const struct inode_operations ext4_fast_symlink_inode_operations = { .readlink = generic_readlink, .get_link = simple_get_link, .setattr = ext4_setattr, + .getattr = ext4_getattr, .listxattr = ext4_listxattr, };