ocfs2: add ext2 attributes

Support immutable, and other attributes.

Some renaming and other minor fixes done by myself.
Signed-off-by: Herbert Poetzl <herbert@13thfloor.at>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

fs/ocfs2/Makefile

@@ -16,6 +16,7 @@ ocfs2-objs := \
 	file.o 			\
 	heartbeat.o 		\
 	inode.o 		\
+	ioctl.o 		\
 	journal.o 		\
 	localalloc.o 		\
 	mmap.o 			\

fs/ocfs2/dlmglue.c

@@ -1330,6 +1330,7 @@ static void __ocfs2_stuff_meta_lvb(struct inode *inode)
 		cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime));
 	lvb->lvb_imtime_packed =
 		cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime));
+	lvb->lvb_iattr    = cpu_to_be32(oi->ip_attr);
 
 	mlog_meta_lvb(0, lockres);
 
@@ -1360,6 +1361,9 @@ static void ocfs2_refresh_inode_from_lvb(struct inode *inode)
 	oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters);
 	i_size_write(inode, be64_to_cpu(lvb->lvb_isize));
 
+	oi->ip_attr = be32_to_cpu(lvb->lvb_iattr);
+	ocfs2_set_inode_flags(inode);
+
 	/* fast-symlinks are a special case */
 	if (S_ISLNK(inode->i_mode) && !oi->ip_clusters)
 		inode->i_blocks = 0;
@@ -2899,8 +2903,9 @@ void ocfs2_dump_meta_lvb_info(u64 level,
 	     be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid),
 	     be16_to_cpu(lvb->lvb_imode));
 	mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, "
-	     "mtime_packed 0x%llx\n", be16_to_cpu(lvb->lvb_inlink),
+	     "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink),
 	     (long long)be64_to_cpu(lvb->lvb_iatime_packed),
 	     (long long)be64_to_cpu(lvb->lvb_ictime_packed),
-	     (long long)be64_to_cpu(lvb->lvb_imtime_packed));
+	     (long long)be64_to_cpu(lvb->lvb_imtime_packed),
+	     be32_to_cpu(lvb->lvb_iattr));
 }

fs/ocfs2/dlmglue.h

@@ -27,7 +27,7 @@
 #ifndef DLMGLUE_H
 #define DLMGLUE_H
 
-#define OCFS2_LVB_VERSION 2
+#define OCFS2_LVB_VERSION 3
 
 struct ocfs2_meta_lvb {
 	__be32       lvb_version;
@@ -40,7 +40,8 @@ struct ocfs2_meta_lvb {
 	__be64       lvb_isize;
 	__be16       lvb_imode;
 	__be16       lvb_inlink;
-	__be32       lvb_reserved[3];
+	__be32       lvb_iattr;
+	__be32       lvb_reserved[2];
 };
 
 /* ocfs2_meta_lock_full() and ocfs2_data_lock_full() 'arg_flags' flags */

fs/ocfs2/file.c

@@ -44,6 +44,7 @@
 #include "file.h"
 #include "sysfile.h"
 #include "inode.h"
+#include "ioctl.h"
 #include "journal.h"
 #include "mmap.h"
 #include "suballoc.h"
@@ -1227,10 +1228,12 @@ const struct file_operations ocfs2_fops = {
 	.open		= ocfs2_file_open,
 	.aio_read	= ocfs2_file_aio_read,
 	.aio_write	= ocfs2_file_aio_write,
+	.ioctl		= ocfs2_ioctl,
 };
 
 const struct file_operations ocfs2_dops = {
 	.read		= generic_read_dir,
 	.readdir	= ocfs2_readdir,
 	.fsync		= ocfs2_sync_file,
+	.ioctl		= ocfs2_ioctl,
 };

fs/ocfs2/inode.c

@@ -71,6 +71,26 @@ static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
 				    struct inode *inode,
 				    struct buffer_head *fe_bh);
 
+void ocfs2_set_inode_flags(struct inode *inode)
+{
+	unsigned int flags = OCFS2_I(inode)->ip_attr;
+
+	inode->i_flags &= ~(S_IMMUTABLE |
+		S_SYNC | S_APPEND | S_NOATIME | S_DIRSYNC);
+
+	if (flags & OCFS2_IMMUTABLE_FL)
+		inode->i_flags |= S_IMMUTABLE;
+
+	if (flags & OCFS2_SYNC_FL)
+		inode->i_flags |= S_SYNC;
+	if (flags & OCFS2_APPEND_FL)
+		inode->i_flags |= S_APPEND;
+	if (flags & OCFS2_NOATIME_FL)
+		inode->i_flags |= S_NOATIME;
+	if (flags & OCFS2_DIRSYNC_FL)
+		inode->i_flags |= S_DIRSYNC;
+}
+
 struct inode *ocfs2_ilookup_for_vote(struct ocfs2_super *osb,
 				     u64 blkno,
 				     int delete_vote)
@@ -260,7 +280,6 @@ int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
 		inode->i_blocks =
 			ocfs2_align_bytes_to_sectors(le64_to_cpu(fe->i_size));
 	inode->i_mapping->a_ops = &ocfs2_aops;
-	inode->i_flags |= S_NOATIME;
 	inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime);
 	inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec);
 	inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime);
@@ -276,6 +295,7 @@ int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
 
 	OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
 	OCFS2_I(inode)->ip_orphaned_slot = OCFS2_INVALID_SLOT;
+	OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr);
 
 	if (create_ino)
 		inode->i_ino = ino_from_blkno(inode->i_sb,
@@ -330,6 +350,9 @@ int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
 	ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_data_lockres,
 				  OCFS2_LOCK_TYPE_DATA, inode);
 
+	ocfs2_set_inode_flags(inode);
+	inode->i_flags |= S_NOATIME;
+
 	status = 0;
 bail:
 	mlog_exit(status);
@@ -1131,6 +1154,7 @@ int ocfs2_mark_inode_dirty(struct ocfs2_journal_handle *handle,
 
 	spin_lock(&OCFS2_I(inode)->ip_lock);
 	fe->i_clusters = cpu_to_le32(OCFS2_I(inode)->ip_clusters);
+	fe->i_attr = cpu_to_le32(OCFS2_I(inode)->ip_attr);
 	spin_unlock(&OCFS2_I(inode)->ip_lock);
 
 	fe->i_size = cpu_to_le64(i_size_read(inode));
@@ -1169,6 +1193,8 @@ void ocfs2_refresh_inode(struct inode *inode,
 	spin_lock(&OCFS2_I(inode)->ip_lock);
 
 	OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
+	OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr);
+	ocfs2_set_inode_flags(inode);
 	i_size_write(inode, le64_to_cpu(fe->i_size));
 	inode->i_nlink = le16_to_cpu(fe->i_links_count);
 	inode->i_uid = le32_to_cpu(fe->i_uid);

fs/ocfs2/inode.h

@@ -56,6 +56,7 @@ struct ocfs2_inode_info
 	struct ocfs2_journal_handle	*ip_handle;
 
 	u32				ip_flags; /* see below */
+	u32				ip_attr; /* inode attributes */
 
 	/* protected by recovery_lock. */
 	struct inode			*ip_next_orphan;
@@ -142,4 +143,6 @@ int ocfs2_mark_inode_dirty(struct ocfs2_journal_handle *handle,
 int ocfs2_aio_read(struct file *file, struct kiocb *req, struct iocb *iocb);
 int ocfs2_aio_write(struct file *file, struct kiocb *req, struct iocb *iocb);
 
+void ocfs2_set_inode_flags(struct inode *inode);
+
 #endif /* OCFS2_INODE_H */

fs/ocfs2/ioctl.c

+/*
+ * linux/fs/ocfs2/ioctl.c
+ *
+ * Copyright (C) 2006 Herbert Poetzl
+ * adapted from Remy Card's ext2/ioctl.c
+ */
+
+#include <linux/fs.h>
+#include <linux/mount.h>
+
+#define MLOG_MASK_PREFIX ML_INODE
+#include <cluster/masklog.h>
+
+#include "ocfs2.h"
+#include "alloc.h"
+#include "dlmglue.h"
+#include "inode.h"
+#include "journal.h"
+
+#include "ocfs2_fs.h"
+#include <linux/ext2_fs.h>
+
+static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
+{
+	int status;
+
+	status = ocfs2_meta_lock(inode, NULL, NULL, 0);
+	if (status < 0) {
+		mlog_errno(status);
+		return status;
+	}
+	*flags = OCFS2_I(inode)->ip_attr;
+	ocfs2_meta_unlock(inode, 0);
+
+	mlog_exit(status);
+	return status;
+}
+
+static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
+				unsigned mask)
+{
+	struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
+	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+	struct ocfs2_journal_handle *handle = NULL;
+	struct buffer_head *bh = NULL;
+	unsigned oldflags;
+	int status;
+
+	mutex_lock(&inode->i_mutex);
+
+	status = ocfs2_meta_lock(inode, NULL, &bh, 1);
+	if (status < 0) {
+		mlog_errno(status);
+		goto bail;
+	}
+
+	status = -EROFS;
+	if (IS_RDONLY(inode))
+		goto bail_unlock;
+
+	status = -EACCES;
+	if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+		goto bail_unlock;
+
+	if (!S_ISDIR(inode->i_mode))
+		flags &= ~OCFS2_DIRSYNC_FL;
+
+	handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
+	if (IS_ERR(handle)) {
+		status = PTR_ERR(handle);
+		mlog_errno(status);
+		goto bail_unlock;
+	}
+
+	oldflags = ocfs2_inode->ip_attr;
+	flags = flags & mask;
+	flags |= oldflags & ~mask;
+
+	/*
+	 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
+	 * the relevant capability.
+	 */
+	status = -EPERM;
+	if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
+		(OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
+		if (!capable(CAP_LINUX_IMMUTABLE))
+			goto bail_unlock;
+	}
+
+	ocfs2_inode->ip_attr = flags;
+	ocfs2_set_inode_flags(inode);
+
+	status = ocfs2_mark_inode_dirty(handle, inode, bh);
+	if (status < 0)
+		mlog_errno(status);
+
+	ocfs2_commit_trans(handle);
+bail_unlock:
+	ocfs2_meta_unlock(inode, 1);
+bail:
+	mutex_unlock(&inode->i_mutex);
+
+	if (bh)
+		brelse(bh);
+
+	mlog_exit(status);
+	return status;
+}
+
+int ocfs2_ioctl(struct inode * inode, struct file * filp,
+	unsigned int cmd, unsigned long arg)
+{
+	unsigned int flags;
+	int status;
+
+	switch (cmd) {
+	case OCFS2_IOC_GETFLAGS:
+		status = ocfs2_get_inode_attr(inode, &flags);
+		if (status < 0)
+			return status;
+
+		flags &= OCFS2_FL_VISIBLE;
+		return put_user(flags, (int __user *) arg);
+	case OCFS2_IOC_SETFLAGS:
+		if (get_user(flags, (int __user *) arg))
+			return -EFAULT;
+
+		return ocfs2_set_inode_attr(inode, flags,
+			OCFS2_FL_MODIFIABLE);
+	default:
+		return -ENOTTY;
+	}
+}
+

fs/ocfs2/ioctl.h

+/*
+ * ioctl.h
+ *
+ * Function prototypes
+ *
+ * Copyright (C) 2006 Herbert Poetzl
+ *
+ */
+
+#ifndef OCFS2_IOCTL_H
+#define OCFS2_IOCTL_H
+
+int ocfs2_ioctl(struct inode * inode, struct file * filp,
+	unsigned int cmd, unsigned long arg);
+
+#endif /* OCFS2_IOCTL_H */

fs/ocfs2/ocfs2_fs.h

@@ -114,6 +114,26 @@
 #define OCFS2_CHAIN_FL		(0x00000400)	/* Chain allocator */
 #define OCFS2_DEALLOC_FL	(0x00000800)	/* Truncate log */
 
+/* Inode attributes, keep in sync with EXT2 */
+#define OCFS2_SECRM_FL		(0x00000001)	/* Secure deletion */
+#define OCFS2_UNRM_FL		(0x00000002)	/* Undelete */
+#define OCFS2_COMPR_FL		(0x00000004)	/* Compress file */
+#define OCFS2_SYNC_FL		(0x00000008)	/* Synchronous updates */
+#define OCFS2_IMMUTABLE_FL	(0x00000010)	/* Immutable file */
+#define OCFS2_APPEND_FL		(0x00000020)	/* writes to file may only append */
+#define OCFS2_NODUMP_FL		(0x00000040)	/* do not dump file */
+#define OCFS2_NOATIME_FL	(0x00000080)	/* do not update atime */
+#define OCFS2_DIRSYNC_FL	(0x00010000)	/* dirsync behaviour (directories only) */
+
+#define OCFS2_FL_VISIBLE	(0x000100FF)	/* User visible flags */
+#define OCFS2_FL_MODIFIABLE	(0x000100FF)	/* User modifiable flags */
+
+/*
+ * ioctl commands
+ */
+#define OCFS2_IOC_GETFLAGS	_IOR('f', 1, long)
+#define OCFS2_IOC_SETFLAGS	_IOW('f', 2, long)
+
 /*
  * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
  */
@@ -399,7 +419,9 @@ struct ocfs2_dinode {
 	__le32 i_atime_nsec;
 	__le32 i_ctime_nsec;
 	__le32 i_mtime_nsec;
-/*70*/	__le64 i_reserved1[9];
+	__le32 i_attr;
+	__le32 i_reserved1;
+/*70*/	__le64 i_reserved2[8];
 /*B8*/	union {
 		__le64 i_pad1;		/* Generic way to refer to this
 					   64bit union */