patch-2.1.70 linux/fs/coda/super.c

• Lines: 613
• Date: Tue Dec 2 14:24:04 1997
• Orig file: v2.1.69/linux/fs/coda/super.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.69/linux/fs/coda/super.c linux/fs/coda/super.c
@@ -0,0 +1,612 @@
+/*
+ * Super block/filesystem wide operations
+ *
+ * Peter J. Braam <braam@maths.ox.ac.uk>, 
+ * Michael Callahan <callahan@maths.ox.ac.uk> Aug 1996
+ * Rewritten for Linux 2.1.57 Peter Braam <braam@cs.cmu.edu>
+ */
+
+#define __NO_VERSION__
+#include <linux/config.h>
+#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_cnode.h>
+#include <linux/coda_namecache.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 inode *inode, 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 */
+void print_vattr( struct coda_vattr *attr );
+static inline struct coda_sb_info *coda_psinode2sb(struct inode *inode);
+static inline struct vcomm *coda_psinode2vcomm(struct inode *inode);
+static int coda_get_psdev(void *, struct inode **);
+static void coda_vattr_to_iattr(struct inode *, struct coda_vattr *);
+static void coda_iattr_to_vattr(struct iattr *, struct coda_vattr *);
+int coda_fetch_inode(struct inode *, struct coda_vattr *);
+
+extern inline struct vcomm *coda_psdev_vcomm(struct inode *inode);
+extern int coda_cnode_make(struct inode **inode, ViceFid *fid, 
+			   struct super_block *sb);
+extern struct cnode *coda_cnode_alloc(void);
+extern void coda_cnode_free(struct cnode *);
+char *coda_f2s(struct ViceFid *, char *);
+
+extern int cfsnc_initialized;
+extern int coda_debug;
+extern int coda_print_entry;
+
+extern struct inode_operations coda_file_inode_operations;
+extern struct inode_operations coda_dir_inode_operations;
+extern struct inode_operations coda_ioctl_inode_operations;
+extern struct inode_operations coda_symlink_inode_operations;
+/* 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;
+        ViceFid fid;
+	kdev_t dev = sb->s_dev;
+        int error;
+	char str[50];
+
+ENTRY;
+        MOD_INC_USE_COUNT; 
+        if (coda_get_psdev(data, &psdev))
+                goto exit;
+
+        vc = coda_psinode2vcomm(psdev);
+        if ( !vc )
+	        goto exit;
+
+	sbi = coda_psinode2sb(psdev);
+	if ( !sbi )
+	        goto exit;
+
+        sbi->sbi_psdev = psdev;
+	sbi->sbi_vcomm = vc;
+
+        lock_super(sb);
+        sb->u.generic_sbp = sbi;
+        sb->s_blocksize = 1024;	/* XXXXX */
+        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 ) {
+	        unlock_super(sb);
+	        printk("coda_read_super: coda_get_rootfid failed with %d\n",
+		   error);
+		goto exit;
+	}	  
+	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid, str));
+	
+        error = coda_cnode_make(&root, &fid, sb);
+        if ( error || !root ) {
+	    printk("Failure of coda_cnode_make for root: error %d\n", error);
+	    unlock_super(sb);
+	    sb->s_dev = 0;
+	    root = NULL;
+	    goto exit;
+	} 
+
+	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);
+        return sb;
+EXIT;  
+
+exit:
+	MOD_DEC_USE_COUNT;
+	sbi->sbi_vcomm = NULL;
+	sbi->sbi_root = NULL;
+        if (root) {
+                iput(root);
+                coda_cnode_free(ITOC(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;
+	sb_info = coda_sbp(sb);
+	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)
+{
+        inode->u.generic_ip = NULL;
+	/*	inode->i_blksize = inode->i_sb->s_blocksize;
+	inode->i_mode = 0;
+	inode->i_op = NULL;
+	NFS_CACHEINV(inode); */
+}
+
+static void coda_put_inode(struct inode *inode) 
+{
+        CDEBUG(D_INODE,"ino: %ld, cnp: %x\n", inode->i_ino,
+	       (int) inode->u.generic_ip);
+}
+
+static void coda_delete_inode(struct inode *inode)
+{
+        struct cnode *cnp;
+        struct inode *open_inode;
+
+        ENTRY;
+        CDEBUG(D_SUPER, " inode->ino: %ld, count: %d\n", 
+	       inode->i_ino, inode->i_count);        
+
+	if ( inode->i_ino == CTL_INO ) {
+	        clear_inode(inode);
+		return;
+	}
+
+        cnp = ITOC(inode);
+
+        open_inode = cnp->c_ovp;
+        if ( open_inode ) {
+                CDEBUG(D_SUPER, "DELINO cached file: ino %ld count %d.\n",  
+		       open_inode->i_ino,  open_inode->i_count);
+                cnp->c_ovp = NULL;
+		cnp->c_odentry.d_inode = NULL;
+                iput( open_inode );
+        }
+	inode->u.generic_ip = NULL;
+        coda_cnode_free(cnp);
+        clear_inode(inode);
+EXIT;
+}
+
+static int  coda_notify_change(struct inode *inode, struct iattr *iattr)
+{
+        struct cnode *cnp;
+        struct coda_vattr vattr;
+        int error;
+ENTRY;
+        memset(&vattr, 0, sizeof(vattr)); 
+        cnp = ITOC(inode);
+        CHECK_CNODE(cnp);
+
+        coda_iattr_to_vattr(iattr, &vattr);
+        vattr.va_type = VNON; /* cannot set type */
+	CDEBUG(D_SUPER, "vattr.va_mode %o\n", vattr.va_mode);
+
+        error = venus_setattr(inode->i_sb, &cnp->c_fid, &vattr);
+
+        if ( !error ) {
+	        coda_vattr_to_iattr(inode, &vattr); 
+		cfsnc_zapfid(&(cnp->c_fid));
+        }
+	CDEBUG(D_SUPER, "inode.i_mode %o, error %d\n", 
+	       inode->i_mode, error);
+
+	EXIT;
+        return error;
+}
+
+/*  we need _something_ */
+static int coda_statfs(struct super_block *sb, struct statfs *buf, 
+		       int bufsiz)
+{
+	struct statfs tmp;
+
+#define NB_SFS_SIZ 0x895440
+
+	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);
+}
+
+
+/* utility functions below */
+static void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)
+{
+        int inode_type;
+        /* inode's i_dev, i_flags, i_ino are set by iget 
+           XXX: is this all we need ??
+           */
+        switch (attr->va_type) {
+        case VNON:
+                inode_type  = 0;
+                break;
+        case VREG:
+                inode_type = S_IFREG;
+                break;
+        case VDIR:
+                inode_type = S_IFDIR;
+                break;
+        case VLNK:
+                inode_type = S_IFLNK;
+                break;
+        default:
+                inode_type = 0;
+        }
+	inode->i_mode |= inode_type;
+
+	if (attr->va_mode != (u_short) -1)
+	        inode->i_mode = attr->va_mode | inode_type;
+        if (attr->va_uid != -1) 
+	        inode->i_uid = (uid_t) attr->va_uid;
+        if (attr->va_gid != -1)
+	        inode->i_gid = (gid_t) attr->va_gid;
+	if (attr->va_nlink != -1)
+	        inode->i_nlink = attr->va_nlink;
+	if (attr->va_size != -1)
+	        inode->i_size = attr->va_size;
+	/*  XXX This needs further study */
+	/*
+        inode->i_blksize = attr->va_blocksize;
+	inode->i_blocks = attr->va_size/attr->va_blocksize 
+	  + (attr->va_size % attr->va_blocksize ? 1 : 0); 
+	  */
+	if (attr->va_atime.tv_sec != -1) 
+	        inode->i_atime = attr->va_atime.tv_sec;
+	if (attr->va_mtime.tv_sec != -1)
+	        inode->i_mtime = attr->va_mtime.tv_sec;
+        if (attr->va_ctime.tv_sec != -1)
+	        inode->i_ctime = attr->va_ctime.tv_sec;
+}
+/* 
+ * BSD sets attributes that need not be modified to -1. 
+ * Linux uses the valid field to indicate what should be
+ * looked at.  The BSD type field needs to be deduced from linux 
+ * mode.
+ * So we have to do some translations here.
+ */
+
+void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
+{
+        umode_t mode;
+        unsigned int valid;
+
+        /* clean out */        
+        vattr->va_mode = (umode_t) -1;
+        vattr->va_uid = (vuid_t) -1; 
+        vattr->va_gid = (vgid_t) -1;
+        vattr->va_size = (off_t) -1;
+	vattr->va_atime.tv_sec = (time_t) -1;
+        vattr->va_mtime.tv_sec  = (time_t) -1;
+	vattr->va_ctime.tv_sec  = (time_t) -1;
+	vattr->va_atime.tv_nsec =  (time_t) -1;
+        vattr->va_mtime.tv_nsec = (time_t) -1;
+	vattr->va_ctime.tv_nsec = (time_t) -1;
+        vattr->va_type = VNON;
+	vattr->va_fileid = (long)-1;
+	vattr->va_gen = (long)-1;
+	vattr->va_bytes = (long)-1;
+	vattr->va_fsid = (long)-1;
+	vattr->va_nlink = (short)-1;
+	vattr->va_blocksize = (long)-1;
+	vattr->va_rdev = (dev_t)-1;
+        vattr->va_flags = 0;
+
+        /* determine the type */
+        mode = iattr->ia_mode;
+                if ( S_ISDIR(mode) ) {
+                vattr->va_type = VDIR; 
+        } else if ( S_ISREG(mode) ) {
+                vattr->va_type = VREG;
+        } else if ( S_ISLNK(mode) ) {
+                vattr->va_type = VLNK;
+        } else {
+                /* don't do others */
+                vattr->va_type = VNON;
+        }
+
+        /* set those vattrs that need change */
+        valid = iattr->ia_valid;
+        if ( valid & ATTR_MODE ) {
+                vattr->va_mode = iattr->ia_mode;
+	}
+        if ( valid & ATTR_UID ) {
+                vattr->va_uid = (vuid_t) iattr->ia_uid;
+	}
+        if ( valid & ATTR_GID ) {
+                vattr->va_gid = (vgid_t) iattr->ia_gid;
+	}
+        if ( valid & ATTR_SIZE ) {
+                vattr->va_size = iattr->ia_size;
+	}
+        if ( valid & ATTR_ATIME ) {
+                vattr->va_atime.tv_sec = iattr->ia_atime;
+                vattr->va_atime.tv_nsec = 0;
+	}
+        if ( valid & ATTR_MTIME ) {
+                vattr->va_mtime.tv_sec = iattr->ia_mtime;
+                vattr->va_mtime.tv_nsec = 0;
+	}
+        if ( valid & ATTR_CTIME ) {
+                vattr->va_ctime.tv_sec = iattr->ia_ctime;
+                vattr->va_ctime.tv_nsec = 0;
+	}
+        
+}
+  
+
+void print_vattr(struct coda_vattr *attr)
+{
+    char *typestr;
+
+    switch (attr->va_type) {
+    case VNON:
+	typestr = "VNON";
+	break;
+    case VREG:
+	typestr = "VREG";
+	break;
+    case VDIR:
+	typestr = "VDIR";
+	break;
+    case VBLK:
+	typestr = "VBLK";
+	break;
+    case VCHR:
+	typestr = "VCHR";
+	break;
+    case VLNK:
+	typestr = "VLNK";
+	break;
+    case VSOCK:
+	typestr = "VSCK";
+	break;
+    case VFIFO:
+	typestr = "VFFO";
+	break;
+    case VBAD:
+	typestr = "VBAD";
+	break;
+    default:
+	typestr = "????";
+	break;
+    }
+
+
+    printk("attr: type %s (%o)  mode %o uid %d gid %d fsid %d rdev %d\n",
+	      typestr, (int)attr->va_type, (int)attr->va_mode, (int)attr->va_uid, 
+	      (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev);
+    
+    printk("      fileid %d nlink %d size %d blocksize %d bytes %d\n",
+	      (int)attr->va_fileid, (int)attr->va_nlink, 
+	      (int)attr->va_size,
+	      (int)attr->va_blocksize,(int)attr->va_bytes);
+    printk("      gen %ld flags %ld vaflags %d\n",
+	      attr->va_gen, attr->va_flags, attr->va_vaflags);
+    printk("      atime sec %d nsec %d\n",
+	      (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec);
+    printk("      mtime sec %d nsec %d\n",
+	      (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec);
+    printk("      ctime sec %d nsec %d\n",
+	      (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec);
+}
+
+/*   */
+int coda_fetch_inode (struct inode *inode, struct coda_vattr *attr)
+{
+        struct cnode *cp;
+        int ino, error=0;
+        CDEBUG(D_SUPER, "fetch for ino: %ld\n", inode->i_ino);
+
+        ino = inode->i_ino;
+        if (!ino)
+                printk("coda_fetch_inode: inode called with i_ino = 0 (don't worry)\n");
+
+        inode->i_op = NULL;
+        inode->i_mode = 0;
+
+        cp = ITOC(inode);
+        CHECK_CNODE(cp);
+
+        /* root inode  */
+        if (cp->c_fid.Volume == 0 &&
+            cp->c_fid.Vnode == 0 &&
+            cp->c_fid.Unique == 0) {
+	        inode->i_ino = 1;
+		inode->i_op = NULL;
+		return 0;
+        }
+        
+        if (IS_CTL_FID( &(cp->c_fid) )) {
+                /* This is the special magic control file.  
+		   Venus doesn't want
+                   to hear a GETATTR about this! */
+                inode->i_op = &coda_ioctl_inode_operations;
+                return 0;
+        }
+
+        if ( ! attr ) {
+                printk("coda_fetch_inode: called with NULL vattr, ino %ld\n",
+		       inode->i_ino);
+                return -1; /* XXX */
+        }
+
+        if (coda_debug & D_SUPER ) print_vattr(attr);
+        coda_vattr_to_iattr(inode, attr);
+
+        if (S_ISREG(inode->i_mode))
+                inode->i_op = &coda_file_inode_operations;
+        else if (S_ISDIR(inode->i_mode))
+                inode->i_op = &coda_dir_inode_operations;
+        else if (S_ISLNK(inode->i_mode))
+                inode->i_op = &coda_symlink_inode_operations;
+        else {
+                printk ("coda_read_inode: what kind of inode is this? i_mode = %o\n", inode->i_mode);
+                inode->i_op = NULL;
+        }
+        return error;
+}
+
+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 inline struct coda_sb_info *
+coda_psinode2sb(struct inode *inode) 
+{
+	unsigned int minor = MINOR(inode->i_rdev);
+
+CDEBUG(D_PSDEV,"minor %d\n", minor);
+	if ( minor < MAX_CODADEVS ) 
+	        return &(coda_super_info[minor]);
+	else
+	        return NULL;
+}
+
+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_read_super: no data!\n");
+		goto error;
+	} else {
+		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);
+		goto error;
+        }
+	psdev = ent->d_inode;
+        
+
+        if (!S_ISCHR(psdev->i_mode)) {
+		printk("not a character device\n");
+		goto error;
+        }
+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));
+		goto error;
+        }
+
+        if (MINOR(psdev->i_rdev) >= MAX_CODADEVS) { 
+		printk("minor %d not an allocated Coda PSDEV\n", 
+		       psdev->i_rdev);
+		goto error;
+        }
+
+        if (psdev->i_count < 1) {
+		printk("coda device minor %d not open (i_count = %d)\n", 
+		       MINOR(psdev->i_rdev), psdev->i_count);
+		goto error;
+        }
+        
+        *res_dev = psdev;
+
+        return 0;
+      
+EXIT;  
+error:
+        return 1;
+}