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>

9 files changed, 217 insertions, 6 deletions

diff --git a/fs/ocfs2/Makefile b/fs/ocfs2/Makefile
index 7d3be845a614..9fb8132f19b0 100644
--- a/fs/ocfs2/Makefile
+++ b/fs/ocfs2/Makefile
@@ -16,6 +16,7 @@ ocfs2-objs := \
         file.o                  \
         heartbeat.o             \
         inode.o                 \
+        ioctl.o                 \
         journal.o               \
         localalloc.o            \
         mmap.o                  \
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 762eb1fbb34d..151b41781eab 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/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));
 }
diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h
index 8f2d1db2d9ea..243ae862ece5 100644
--- a/fs/ocfs2/dlmglue.h
+++ b/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 */
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index a9559c874530..2bbfa17090cf 100644
--- a/fs/ocfs2/file.c
+++ b/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,
 };
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 327a5b7b86ed..3f496c41fea8 100644
--- a/fs/ocfs2/inode.c
+++ b/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);
diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h
index 35140f6cf840..4d1e53992566 100644
--- a/fs/ocfs2/inode.h
+++ b/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 */
diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
new file mode 100644
index 000000000000..68f4806d3a35
--- /dev/null
+++ b/fs/ocfs2/ioctl.c
@@ -0,0 +1,134 @@
+/*
+ * 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;
+        }
+}
+
diff --git a/fs/ocfs2/ioctl.h b/fs/ocfs2/ioctl.h
new file mode 100644
index 000000000000..4a7c82931dba
--- /dev/null
+++ b/fs/ocfs2/ioctl.h
@@ -0,0 +1,16 @@
+/*
+ * 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 */
diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index c5b1ac547c15..3330a5dc6be2 100644
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/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 */