patch-2.1.90 linux/fs/coda/inode.c

• Lines: 370
• Date: Tue Mar 17 21:19:05 1998
• Orig file: v2.1.89/linux/fs/coda/inode.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.89/linux/fs/coda/inode.c linux/fs/coda/inode.c
@@ -0,0 +1,369 @@
+/*
+ * Super block/filesystem wide operations
+ *
+ * Copryright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and 
+ * Michael Callahan <callahan@maths.ox.ac.uk> 
+ * 
+ * Rewritten for Linux 2.1.  Peter Braam <braam@cs.cmu.edu>
+ * Copyright (C) Carnegie Mellon University
+ */
+
+#define __NO_VERSION__
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/locks.h>
+#include <linux/unistd.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/locks.h>
+#include <linux/string.h>
+#include <asm/uaccess.h>
+#include <linux/vmalloc.h>
+#include <asm/segment.h>
+
+#include <linux/coda.h>
+#include <linux/coda_linux.h>
+#include <linux/coda_psdev.h>
+#include <linux/coda_fs_i.h>
+#include <linux/coda_cache.h>
+
+
+/* VFS super_block ops */
+static struct super_block *coda_read_super(struct super_block *, void *, int);
+static void coda_read_inode(struct inode *);
+static int  coda_notify_change(struct dentry *dentry, struct iattr *attr);
+static void coda_put_inode(struct inode *);
+static void coda_delete_inode(struct inode *);
+static void coda_put_super(struct super_block *);
+static int coda_statfs(struct super_block *sb, struct statfs *buf, 
+		       int bufsiz);
+
+/* helper functions */
+static inline struct vcomm *coda_psinode2vcomm(struct inode *inode);
+static int coda_get_psdev(void *, struct inode **);
+static struct coda_sb_info *coda_psinode2sbi(struct inode *inode);
+
+/* exported operations */
+struct super_operations coda_super_operations =
+{
+	coda_read_inode,        /* read_inode */
+	NULL,                   /* write_inode */
+	coda_put_inode,	        /* put_inode */
+	coda_delete_inode,      /* delete_inode */
+	coda_notify_change,	/* notify_change */
+	coda_put_super,	        /* put_super */
+	NULL,			/* write_super */
+	coda_statfs,   		/* statfs */
+	NULL			/* remount_fs */
+};
+
+/*
+ * globals
+ */
+struct coda_sb_info coda_super_info[MAX_CODADEVS];
+
+
+static struct super_block * coda_read_super(struct super_block *sb, 
+					    void *data, int silent)
+{
+        struct inode *psdev = 0, *root = 0; 
+	struct coda_sb_info *sbi = NULL;
+	struct vcomm *vc = NULL;
+        ViceFid fid;
+	kdev_t dev = sb->s_dev;
+        int error;
+
+	ENTRY;
+        MOD_INC_USE_COUNT; 
+        if (coda_get_psdev(data, &psdev))
+                goto error;
+
+        vc = coda_psinode2vcomm(psdev);
+        if ( !vc )
+	        goto error;
+	vc->vc_sb = sb;
+	vc->vc_inuse = 1;
+
+	sbi = coda_psinode2sbi(psdev);
+	if ( !sbi )
+	        goto error;
+        sbi->sbi_psdev = psdev;
+	sbi->sbi_vcomm = vc;
+	INIT_LIST_HEAD(&(sbi->sbi_cchead));
+	INIT_LIST_HEAD(&(sbi->sbi_volroothead));
+
+        lock_super(sb);
+        sb->u.generic_sbp = sbi;
+        sb->s_blocksize = 1024;	/* XXXXX  what do we put here?? */
+        sb->s_blocksize_bits = 10;
+        sb->s_magic = CODA_SUPER_MAGIC;
+        sb->s_dev = dev;
+        sb->s_op = &coda_super_operations;
+
+	/* get root fid from Venus: this needs the root inode */
+	error = venus_rootfid(sb, &fid);
+	if ( error ) {
+	        printk("coda_read_super: coda_get_rootfid failed with %d\n",
+		       error);
+		sb->s_dev = 0;
+	        unlock_super(sb);
+		goto error;
+	}	  
+	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
+	
+	/* make root inode */
+        error = coda_cnode_make(&root, &fid, sb);
+        if ( error || !root ) {
+	    printk("Failure of coda_cnode_make for root: error %d\n", error);
+	    sb->s_dev = 0;
+	    unlock_super(sb);
+	    goto error;
+	} 
+
+	printk("coda_read_super: rootinode is %ld dev %d\n", 
+	       root->i_ino, root->i_dev);
+	sbi->sbi_root = root;
+	sb->s_root = d_alloc_root(root, NULL);
+	unlock_super(sb);
+	EXIT;  
+        return sb;
+
+error:
+EXIT;  
+	MOD_DEC_USE_COUNT;
+	if (sbi) {
+		sbi->sbi_vcomm = NULL;
+		sbi->sbi_root = NULL;
+	}
+	if ( vc ) {
+		vc->vc_sb = NULL;
+		vc->vc_inuse = 0;
+	}
+        if (root) {
+                iput(root);
+        }
+        sb->s_dev = 0;
+        return NULL;
+}
+
+static void coda_put_super(struct super_block *sb)
+{
+        struct coda_sb_info *sb_info;
+
+        ENTRY;
+
+        lock_super(sb);
+
+        sb->s_dev = 0;
+	coda_cache_clear_all(sb);
+	sb_info = coda_sbp(sb);
+	sb_info->sbi_vcomm->vc_inuse = 0;
+	sb_info->sbi_vcomm->vc_sb = NULL;
+	printk("Coda: Bye bye.\n");
+	memset(sb_info, 0, sizeof(* sb_info));
+
+        unlock_super(sb);
+        MOD_DEC_USE_COUNT;
+	EXIT;
+}
+
+/* all filling in of inodes postponed until lookup */
+static void coda_read_inode(struct inode *inode)
+{
+	struct coda_inode_info *cii;
+	ENTRY;
+	cii = ITOC(inode);
+	cii->c_magic = 0;
+	return;
+}
+
+static void coda_put_inode(struct inode *in) 
+{
+	ENTRY;
+
+        CDEBUG(D_INODE,"ino: %ld, count %d\n", in->i_ino, in->i_count);
+
+	if ( in->i_count == 1 ) 
+		in->i_nlink = 0;
+		
+}
+
+static void coda_delete_inode(struct inode *inode)
+{
+        struct coda_inode_info *cii;
+        struct inode *open_inode;
+
+        ENTRY;
+        CDEBUG(D_SUPER, " inode->ino: %ld, count: %d\n", 
+	       inode->i_ino, inode->i_count);        
+
+        cii = ITOC(inode);
+	if ( inode->i_ino == CTL_INO || cii->c_magic != CODA_CNODE_MAGIC ) {
+	        clear_inode(inode);
+		return;
+	}
+
+
+	if ( coda_fid_is_volroot(&cii->c_fid) )
+		list_del(&cii->c_volrootlist);
+
+        open_inode = cii->c_ovp;
+        if ( open_inode ) {
+                CDEBUG(D_SUPER, "DELINO cached file: ino %ld count %d.\n",  
+		       open_inode->i_ino,  open_inode->i_count);
+                cii->c_ovp = NULL;
+                iput(open_inode);
+        }
+	
+	coda_cache_clear_inode(inode);
+
+	inode->u.generic_ip = NULL;
+        clear_inode(inode);
+	EXIT;
+}
+
+static int  coda_notify_change(struct dentry *de, struct iattr *iattr)
+{
+	struct inode *inode = de->d_inode;
+        struct coda_inode_info *cii;
+        struct coda_vattr vattr;
+        int error;
+	
+	ENTRY;
+        memset(&vattr, 0, sizeof(vattr)); 
+        cii = ITOC(inode);
+        CHECK_CNODE(cii);
+
+        coda_iattr_to_vattr(iattr, &vattr);
+        vattr.va_type = C_VNON; /* cannot set type */
+	CDEBUG(D_SUPER, "vattr.va_mode %o\n", vattr.va_mode);
+
+        error = venus_setattr(inode->i_sb, &cii->c_fid, &vattr);
+
+        if ( !error ) {
+	        coda_vattr_to_iattr(inode, &vattr); 
+		coda_cache_clear_inode(inode);
+        }
+	CDEBUG(D_SUPER, "inode.i_mode %o, error %d\n", 
+	       inode->i_mode, error);
+
+	EXIT;
+        return error;
+}
+
+/*  we need _something_ for this routine. Let's mimic AFS */
+static int coda_statfs(struct super_block *sb, struct statfs *buf, 
+		       int bufsiz)
+{
+	struct statfs tmp;
+
+	tmp.f_type = CODA_SUPER_MAGIC;
+	tmp.f_bsize = 1024;
+	tmp.f_blocks = 9000000;
+	tmp.f_bfree = 9000000;
+	tmp.f_bavail = 9000000 ;
+	tmp.f_files = 9000000;
+	tmp.f_ffree = 9000000;
+	tmp.f_namelen = 0;
+	copy_to_user(buf, &tmp, bufsiz);
+	return 0; 
+}
+
+
+/* init_coda: used by filesystems.c to register coda */
+
+struct file_system_type coda_fs_type = {
+   "coda", 0, coda_read_super, NULL
+};
+
+int init_coda_fs(void)
+{
+	return register_filesystem(&coda_fs_type);
+}
+
+/* MODULE stuff is in psdev.c */
+
+/*  helpers */
+static inline struct vcomm *coda_psinode2vcomm(struct inode *inode) 
+{
+        
+	unsigned int minor = MINOR(inode->i_rdev);
+	CDEBUG(D_PSDEV,"minor %d\n", minor);
+	if ( minor < MAX_CODADEVS ) 
+	      return &(psdev_vcomm[minor]);
+	else
+	      return NULL;
+}
+
+static struct coda_sb_info *coda_psinode2sbi(struct inode *inode) 
+{
+	unsigned int minor = MINOR(inode->i_rdev);
+
+	CDEBUG(D_PSDEV,"minor %d\n", minor);
+	if ( (minor >= 0) && (minor < MAX_CODADEVS)) 
+	        return &(coda_super_info[minor]);
+	else
+	        return NULL;
+}
+
+/* name lookup for psdev passed in by mount */
+static int coda_get_psdev(void *data, struct inode **res_dev)
+{
+        char **psdev_path;
+        struct inode *psdev = 0;
+	struct dentry *ent=NULL;
+
+ 
+	if ( ! data ) { 
+		printk("coda_get_psdev: no data!\n");
+		return 1;
+	} 
+
+	psdev_path = data;
+        ent = namei((char *) *psdev_path);
+        if (IS_ERR(ent)) {
+		printk("namei error %ld for %d\n", PTR_ERR(ent), 
+		       (int) psdev_path);
+		return 1;
+        }
+	psdev = ent->d_inode;
+
+        if (!S_ISCHR(psdev->i_mode)) {
+		printk("not a character device\n");
+		return 1;
+        }
+	CDEBUG(D_PSDEV,"major %d, minor %d, count %d\n", 
+	       MAJOR(psdev->i_rdev), 
+	       MINOR(psdev->i_rdev), psdev->i_count);
+        
+        if (MAJOR(psdev->i_rdev) != CODA_PSDEV_MAJOR) {
+		printk("device %d not a Coda PSDEV device\n", 
+		       MAJOR(psdev->i_rdev));
+		return 1;
+        }
+
+        if (MINOR(psdev->i_rdev) >= MAX_CODADEVS) { 
+		printk("minor %d not an allocated Coda PSDEV\n", 
+		       psdev->i_rdev);
+		return 1;
+        }
+
+        if (psdev->i_count < 1) {
+		printk("coda device minor %d not open (i_count = %d)\n", 
+		       MINOR(psdev->i_rdev), psdev->i_count);
+		return 1;
+        }
+        
+        *res_dev = psdev;
+	EXIT;  
+        return 0;
+}