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-rw-r--r--fs/coda/inode.c369
1 files changed, 369 insertions, 0 deletions
diff --git a/fs/coda/inode.c b/fs/coda/inode.c
new file mode 100644
index 000000000..96d07e265
--- /dev/null
+++ b/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;
+}
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