The famfs inode and super operations are pretty much generic.
This commit builds but is still too incomplete to run
Signed-off-by: John Groves <john@xxxxxxxxxx>
---
fs/famfs/famfs_inode.c | 113 +++++++++++++++++++++++++++++++++++++++--
1 file changed, 110 insertions(+), 3 deletions(-)
diff --git a/fs/famfs/famfs_inode.c b/fs/famfs/famfs_inode.c
index 61306240fc0b..e00e9cdecadf 100644
--- a/fs/famfs/famfs_inode.c
+++ b/fs/famfs/famfs_inode.c
@@ -28,6 +28,9 @@
#define FAMFS_DEFAULT_MODE 0755
+static const struct inode_operations famfs_file_inode_operations;
+static const struct inode_operations famfs_dir_inode_operations;
+
static struct inode *famfs_get_inode(struct super_block *sb,
const struct inode *dir,
umode_t mode, dev_t dev)
@@ -52,11 +55,11 @@ static struct inode *famfs_get_inode(struct super_block *sb,
init_special_inode(inode, mode, dev);
break;
case S_IFREG:
- inode->i_op = NULL /* famfs_file_inode_operations */;
+ inode->i_op = &famfs_file_inode_operations;
inode->i_fop = NULL /* &famfs_file_operations */;
break;
case S_IFDIR:
- inode->i_op = NULL /* famfs_dir_inode_operations */;
+ inode->i_op = &famfs_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
/* Directory inodes start off with i_nlink == 2 (for ".") */
@@ -70,6 +73,110 @@ static struct inode *famfs_get_inode(struct super_block *sb,
return inode;
}
+/***************************************************************************
+ * famfs inode_operations: these are currently pretty much boilerplate
+ */
+
+static const struct inode_operations famfs_file_inode_operations = {
+ /* All generic */
+ .setattr = simple_setattr,
+ .getattr = simple_getattr,
+};
+
+/*
+ * File creation. Allocate an inode, and we're done..
+ */
+static int
+famfs_mknod(struct mnt_idmap *idmap, struct inode *dir, struct dentry *dentry,
+ umode_t mode, dev_t dev)
+{
+ struct famfs_fs_info *fsi = dir->i_sb->s_fs_info;
+ struct timespec64 tv;
+ struct inode *inode;
+
+ if (fsi->deverror)
+ return -ENODEV;
+
+ inode = famfs_get_inode(dir->i_sb, dir, mode, dev);
+ if (!inode)
+ return -ENOSPC;
+
+ d_instantiate(dentry, inode);
+ dget(dentry); /* Extra count - pin the dentry in core */
+ tv = inode_set_ctime_current(inode);
+ inode_set_mtime_to_ts(inode, tv);
+ inode_set_atime_to_ts(inode, tv);
+
+ return 0;
+}
+
+static int famfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
+ struct dentry *dentry, umode_t mode)
+{
+ struct famfs_fs_info *fsi = dir->i_sb->s_fs_info;
+ int rc;
+
+ if (fsi->deverror)
+ return -ENODEV;
+
+ rc = famfs_mknod(&nop_mnt_idmap, dir, dentry, mode | S_IFDIR, 0);
+ if (rc)
+ return rc;
+
+ inc_nlink(dir);
+
+ return 0;
+}
+
+static int famfs_create(struct mnt_idmap *idmap, struct inode *dir,
+ struct dentry *dentry, umode_t mode, bool excl)
+{
+ struct famfs_fs_info *fsi = dir->i_sb->s_fs_info;
+
+ if (fsi->deverror)
+ return -ENODEV;
+
+ return famfs_mknod(&nop_mnt_idmap, dir, dentry, mode | S_IFREG, 0);
+}
+
+static const struct inode_operations famfs_dir_inode_operations = {
+ .create = famfs_create,
+ .lookup = simple_lookup,
+ .link = simple_link,
+ .unlink = simple_unlink,
+ .mkdir = famfs_mkdir,
+ .rmdir = simple_rmdir,
+ .rename = simple_rename,
+};
+
+/*****************************************************************************
+ * famfs super_operations
+ *
+ * TODO: implement a famfs_statfs() that shows size, free and available space,
+ * etc.
+ */
+
+/*
+ * famfs_show_options() - Display the mount options in /proc/mounts.
+ */
+static int famfs_show_options(struct seq_file *m, struct dentry *root)
+{
+ struct famfs_fs_info *fsi = root->d_sb->s_fs_info;
+
+ if (fsi->mount_opts.mode != FAMFS_DEFAULT_MODE)
+ seq_printf(m, ",mode=%o", fsi->mount_opts.mode);
+
+ return 0;
+}
+
+static const struct super_operations famfs_super_ops = {
+ .statfs = simple_statfs,
+ .drop_inode = generic_delete_inode,
+ .show_options = famfs_show_options,
+};
+
+/*****************************************************************************/
+
/*
* famfs dax_operations (for char dax)
*/
@@ -103,7 +210,7 @@ famfs_fill_super(struct super_block *sb, struct fs_context *fc)
sb->s_blocksize = PAGE_SIZE;
sb->s_blocksize_bits = PAGE_SHIFT;
sb->s_magic = FAMFS_SUPER_MAGIC;
- sb->s_op = NULL /* famfs_super_ops */;
+ sb->s_op = &famfs_super_ops;
sb->s_time_gran = 1;
return rc;
--
2.43.0
