[PATCH] Coda FS update

Most of these changes have been tested and used in the 2.4 tree, so this
is mostly a forward port of 2.4 bugfixes.

* C99 initializers
* Added specific initializations instead of assuming that the private
  part of the inode is already initialized.
* Remove unused code.
* Moved container file to the struct file private data, this is to
* correct the session semantics model when file updates are fetched from
* the server (old 'sessions' shouldn't see the new container yet).
* Fixed consistency (and occasional oopes) when mmap-ing Coda files.
* Fixing up inode numbers in readdir, old libc5 getcwd was broken.
* Nuked upcall_stats, all of this can easily be maintained in userspace,
  and the existing code suffers from overflows in the fixed point
  calculations.

fs/coda/cnode.c

@@ -26,9 +26,9 @@ inline int coda_isnullfid(ViceFid *fid)
 }
 
 static struct inode_operations coda_symlink_inode_operations = {
-	readlink:	page_readlink,
-	follow_link:	page_follow_link,
-	setattr:	coda_setattr,
+	.readlink	= page_readlink,
+	.follow_link	= page_follow_link,
+	.setattr	= coda_setattr,
 };
 
 /* cnode.c */
@@ -85,6 +85,7 @@ struct inode * coda_iget(struct super_block * sb, ViceFid * fid,
 		cii = ITOC(inode);
 		/* we still need to set i_ino for things like stat(2) */
 		inode->i_ino = hash;
+		cii->c_mapcount = 0;
 		list_add(&cii->c_cilist, &sbi->sbi_cihead);
 		unlock_new_inode(inode);
 	}

fs/coda/coda_linux.c

@@ -29,21 +29,7 @@ int coda_fake_statfs;
 char * coda_f2s(ViceFid *f)
 {
 	static char s[60];
-	if ( f ) {
-		sprintf(s, "(%-#lx,%-#lx,%-#lx)", 
-			 f->Volume, f->Vnode, f->Unique);
-	}
-	return s;
-}
-
-/* print another fid */
-char * coda_f2s2(ViceFid *f)
-{
-	static char s[60];
-	if ( f ) {
-		sprintf(s, "(%-#lx,%-#lx,%-#lx)", 
-			 f->Volume, f->Vnode, f->Unique);
-	}
+	sprintf(s, "(%-#lx.%-#lx.%-#lx)", f->Volume, f->Vnode, f->Unique);
 	return s;
 }
 

fs/coda/dir.c

@@ -49,40 +49,42 @@ static int coda_dentry_revalidate(struct dentry *de, int);
 static int coda_dentry_delete(struct dentry *);
 
 /* support routines */
-static int coda_venus_readdir(struct file *filp, filldir_t filldir, void *dirent);
+static int coda_venus_readdir(struct file *filp, filldir_t filldir,
+			      void *dirent, struct dentry *dir);
 int coda_fsync(struct file *, struct dentry *dentry, int datasync);
 
 int coda_hasmknod;
 
 struct dentry_operations coda_dentry_operations =
 {
-	d_revalidate:	coda_dentry_revalidate,
-	d_delete:	coda_dentry_delete,
+	.d_revalidate	= coda_dentry_revalidate,
+	.d_delete	= coda_dentry_delete,
 };
 
 struct inode_operations coda_dir_inode_operations =
 {
-	create:		coda_create,
-	lookup:		coda_lookup,
-	link:		coda_link,
-	unlink:		coda_unlink,
-	symlink:	coda_symlink,
-	mkdir:		coda_mkdir,
-	rmdir:		coda_rmdir,
-	mknod:		coda_mknod,
-	rename:		coda_rename,
-	permission:	coda_permission,
-        getattr:	coda_getattr,
-	setattr:	coda_setattr,
+	.create		= coda_create,
+	.lookup		= coda_lookup,
+	.link		= coda_link,
+	.unlink		= coda_unlink,
+	.symlink	= coda_symlink,
+	.mkdir		= coda_mkdir,
+	.rmdir		= coda_rmdir,
+	.mknod		= coda_mknod,
+	.rename		= coda_rename,
+	.permission	= coda_permission,
+	.getattr	= coda_getattr,
+	.setattr	= coda_setattr,
 };
 
 struct file_operations coda_dir_operations = {
-	read:		generic_read_dir,
-	readdir:	coda_readdir,
-	open:		coda_open,
-	flush:  	coda_flush,
-	release:	coda_release,
-	fsync:		coda_fsync,
+	.llseek		= generic_file_llseek,
+	.read		= generic_read_dir,
+	.readdir	= coda_readdir,
+	.open		= coda_open,
+	.flush		= coda_flush,
+	.release	= coda_release,
+	.fsync		= coda_fsync,
 };
 
 
@@ -477,31 +479,42 @@ static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
 /* file operations for directories */
 int coda_readdir(struct file *coda_file, void *dirent, filldir_t filldir)
 {
-        int result = 0;
 	struct dentry *coda_dentry = coda_file->f_dentry;
-	struct inode *coda_inode = coda_dentry->d_inode;
-	struct coda_inode_info *cii = ITOC(coda_inode);
-	struct file *host_file = cii->c_container;
+	struct coda_file_info *cfi;
+	struct file *host_file;
+	struct inode *host_inode;
+	int ret;
 
-        BUG_ON(!host_file);
+	cfi = CODA_FTOC(coda_file);
+	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
+	host_file = cfi->cfi_container;
 
 	coda_vfs_stat.readdir++;
 
-	/* Access to both host and coda f_pos fields is serialized on the
-	 * coda_file->f_dentry->d_inode->i_sem which has already been taken by
-	 * vfs_readdir. Userspace shouldn't 'play' with the container file as
-	 * long as the file is held open. */
+	host_inode = host_file->f_dentry->d_inode;
+	down(&host_inode->i_sem);
 	host_file->f_pos = coda_file->f_pos;
 
-	if ( !host_file->f_op->readdir )
+	if (!host_file->f_op->readdir) {
 		/* Venus: we must read Venus dirents from the file */
-		result = coda_venus_readdir(host_file, filldir, dirent);
-        else
-		/* potemkin case: we were handed a directory inode */
-		result = vfs_readdir(host_file, filldir, dirent);
+		ret = coda_venus_readdir(host_file, filldir, dirent, coda_dentry);
+	} else {
+		/* potemkin case: we were handed a directory inode. */
+		/* Yuk, we can't call vfs_readdir because we are already
+		 * holding the inode semaphore. */
+		ret = -ENOTDIR;
+		if (!host_file->f_op || !host_file->f_op->readdir)
+			goto out;
 
+		ret = -ENOENT;
+		if (!IS_DEADDIR(host_inode))
+			ret = host_file->f_op->readdir(host_file, filldir, dirent);
+	}
+out:
 	coda_file->f_pos = host_file->f_pos;
-	return result;
+	up(&host_inode->i_sem);
+
+	return ret;
 }
 
 static inline unsigned int CDT2DT(unsigned char cdt)
@@ -525,20 +538,38 @@ static inline unsigned int CDT2DT(unsigned char cdt)
 
 /* support routines */
 static int coda_venus_readdir(struct file *filp, filldir_t filldir,
-			      void *getdent)
+			      void *dirent, struct dentry *dir)
 {
 	int result = 0; /* # of entries returned */
 	struct venus_dirent *vdir;
 	unsigned long vdir_size =
 	    (unsigned long)(&((struct venus_dirent *)0)->d_name);
-	int ret;
+	unsigned int type;
+	struct qstr name;
+	ino_t ino;
+	int ret, i;
 
 	vdir = (struct venus_dirent *)kmalloc(sizeof(*vdir), GFP_KERNEL);
 	if (!vdir) return -ENOMEM;
 
-	while(1) {
-		/* we use this routine to read the file into our buffer */
-		ret = kernel_read(filp, filp->f_pos, (char *)vdir,
+	i = filp->f_pos;
+	switch(i) {
+	case 0:
+		ret = filldir(dirent, ".", 1, 0, dir->d_inode->i_ino, DT_DIR);
+		if (ret < 0) break;
+		result++;
+		filp->f_pos++;
+		/* fallthrough */
+	case 1:
+		ret = filldir(dirent, "..", 2, 1, dir->d_parent->d_inode->i_ino, DT_DIR);
+		if (ret < 0) break;
+		result++;
+		filp->f_pos++;
+		/* fallthrough */
+	default:
+	while (1) {
+		/* read entries from the directory file */
+		ret = kernel_read(filp, filp->f_pos - 2, (char *)vdir,
 				  sizeof(*vdir));
 		if (ret < 0) {
 			printk("coda_venus_readdir: read dir failed %d\n", ret);
@@ -556,17 +587,32 @@ static int coda_venus_readdir(struct file *filp, filldir_t filldir,
 		/* validate whether the directory file actually makes sense */
 		if (vdir->d_reclen < vdir_size + vdir->d_namlen ||
 		    vdir->d_namlen > CODA_MAXNAMLEN) {
-		    printk("coda_venus_readdir: Invalid directory: %ld\n", 
+			printk("coda_venus_readdir: Invalid dir: %ld\n",
 			       filp->f_dentry->d_inode->i_ino);
 			ret = -EBADF;
 			break;
 		}
 
+		name.len = vdir->d_namlen;
+		name.name = vdir->d_name;
+
+		/* Make sure we skip '.' and '..', we already got those */
+		if (name.name[0] == '.' && (name.len == 1 ||
+		    (vdir->d_name[1] == '.' && name.len == 2)))
+			vdir->d_fileno = name.len = 0;
+
 		/* skip null entries */
-		if (vdir->d_fileno) {
-		    unsigned int d_type = CDT2DT(vdir->d_type);
-		    ret = filldir(getdent, vdir->d_name, vdir->d_namlen, 
-				  filp->f_pos, vdir->d_fileno, d_type); 
+		if (vdir->d_fileno && name.len) {
+			/* try to look up this entry in the dcache, that way
+			 * userspace doesn't have to worry about breaking
+			 * getcwd by having mismatched inode numbers for
+			 * internal volume mountpoints. */
+			ino = find_inode_number(dir, &name);
+			if (!ino) ino = vdir->d_fileno;
+
+			type = CDT2DT(vdir->d_type);
+			ret = filldir(dirent, name.name, name.len, filp->f_pos,
+				      ino, type); 
 			/* failure means no space for filling in this round */
 			if (ret < 0) break;
 			result++;
@@ -575,6 +621,7 @@ static int coda_venus_readdir(struct file *filp, filldir_t filldir,
 		 * we've already established it is non-zero. */
 		filp->f_pos += vdir->d_reclen;
 	}
+	} 
 	kfree(vdir);
 	return result ? result : ret;
 }
@@ -660,7 +707,7 @@ int coda_revalidate_inode(struct dentry *dentry)
 	if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) {
 		error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr);
 		if ( error )
-			goto return_bad_inode;
+			goto return_bad;
 
 		/* this inode may be lost if:
 		   - it's ino changed 
@@ -679,7 +726,7 @@ int coda_revalidate_inode(struct dentry *dentry)
 		/* the following can happen when a local fid is replaced 
 		   with a global one, here we lose and declare the inode bad */
 		if (inode->i_ino != old_ino)
-			goto return_bad_inode;
+			goto return_bad;
 		
 		coda_flag_inode_children(inode, C_FLUSH);
 		cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
@@ -689,13 +736,7 @@ int coda_revalidate_inode(struct dentry *dentry)
 	unlock_kernel();
 	return 0;
 
-return_bad_inode:
-        inode->i_mapping = &inode->i_data;
-	if (cii->c_container) {
-		fput(cii->c_container);
-		cii->c_container = NULL;
-	}
-	make_bad_inode(inode);
+return_bad:
 	unlock_kernel();
 	return -EIO;
 }

fs/coda/inode.c

@@ -8,7 +8,6 @@
  * Copyright (C) Carnegie Mellon University
  */
 
-#define __NO_VERSION__
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
@@ -47,8 +46,6 @@ static struct inode *coda_alloc_inode(struct super_block *sb)
 	memset(&ei->c_fid, 0, sizeof(struct ViceFid));
 	ei->c_flags = 0;
 	INIT_LIST_HEAD(&ei->c_cilist);
-	ei->c_container = NULL;
-	ei->c_contcount = 0;
 	memset(&ei->c_cached_cred, 0, sizeof(struct coda_cred));
 	ei->c_cached_perm = 0;
 	return &ei->vfs_inode;
@@ -88,11 +85,11 @@ void coda_destroy_inodecache(void)
 /* exported operations */
 struct super_operations coda_super_operations =
 {
-	alloc_inode:	coda_alloc_inode,
-	destroy_inode:	coda_destroy_inode,
-	clear_inode:	coda_clear_inode,
-	put_super:	coda_put_super,
-	statfs:		coda_statfs,
+	.alloc_inode	= coda_alloc_inode,
+	.destroy_inode	= coda_destroy_inode,
+	.clear_inode	= coda_clear_inode,
+	.put_super	= coda_put_super,
+	.statfs		= coda_statfs,
 };
 
 static int get_device_index(struct coda_mount_data *data)
@@ -230,10 +227,7 @@ static void coda_clear_inode(struct inode *inode)
 {
 	struct coda_inode_info *cii = ITOC(inode);
 
-	if (cii->c_container) BUG();
-	
 	list_del_init(&cii->c_cilist);
-	inode->i_mapping = &inode->i_data;
 	coda_cache_clear_inode(inode);
 }
 
@@ -273,9 +267,9 @@ int coda_setattr(struct dentry *de, struct iattr *iattr)
 }
 
 struct inode_operations coda_file_inode_operations = {
-	permission:	coda_permission,
-	getattr:	coda_getattr,
-	setattr:	coda_setattr,
+	.permission	= coda_permission,
+	.getattr	= coda_getattr,
+	.setattr	= coda_setattr,
 };
 
 static int coda_statfs(struct super_block *sb, struct statfs *buf)
@@ -314,8 +308,9 @@ static struct super_block *coda_get_sb(struct file_system_type *fs_type,
 }
 
 struct file_system_type coda_fs_type = {
-	owner:		THIS_MODULE,
-	name:		"coda",
-	get_sb:		coda_get_sb,
-	kill_sb:	kill_anon_super,
+	.owner		= THIS_MODULE,
+	.name		= "coda",
+	.get_sb		= coda_get_sb,
+	.kill_sb	= kill_anon_super,
 };
+

fs/coda/pioctl.c

@@ -14,7 +14,6 @@
 #include <linux/stat.h>
 #include <linux/errno.h>
 #include <linux/string.h>
-#define __NO_VERSION__
 #include <linux/namei.h>
 #include <linux/module.h>
 #include <asm/uaccess.h>
@@ -32,13 +31,13 @@ static int coda_pioctl(struct inode * inode, struct file * filp,
 /* exported from this file */
 struct inode_operations coda_ioctl_inode_operations =
 {
-	permission:	coda_ioctl_permission,
-	setattr:	coda_setattr,
+	.permission	= coda_ioctl_permission,
+	.setattr	= coda_setattr,
 };
 
 struct file_operations coda_ioctl_operations = {
-	owner:		THIS_MODULE,
-	ioctl:		coda_pioctl,
+	.owner		= THIS_MODULE,
+	.ioctl		= coda_pioctl,
 };
 
 /* the coda pioctl inode ops */

fs/coda/psdev.c

@@ -353,13 +353,13 @@ static int coda_psdev_release(struct inode * inode, struct file * file)
 
 
 static struct file_operations coda_psdev_fops = {
-	owner:		THIS_MODULE,
-	read:		coda_psdev_read,
-	write:		coda_psdev_write,
-	poll:		coda_psdev_poll,
-	ioctl:		coda_psdev_ioctl,
-	open:		coda_psdev_open,
-	release:	coda_psdev_release,
+	.owner		= THIS_MODULE,
+	.read		= coda_psdev_read,
+	.write		= coda_psdev_write,
+	.poll		= coda_psdev_poll,
+	.ioctl		= coda_psdev_ioctl,
+	.open		= coda_psdev_open,
+	.release	= coda_psdev_release,
 };
 
 static devfs_handle_t devfs_handle;

fs/coda/symlink.c

@@ -51,5 +51,5 @@ static int coda_symlink_filler(struct file *file, struct page *page)
 }
 
 struct address_space_operations coda_symlink_aops = {
-	readpage:	coda_symlink_filler
+	.readpage	= coda_symlink_filler,
 };

fs/coda/sysctl.c

@@ -22,7 +22,6 @@
 #include <asm/bitops.h>
 #include <asm/uaccess.h>
 #include <linux/utsname.h>
-#define __NO_VERSION__
 #include <linux/module.h>
 
 #include <linux/coda.h>
@@ -39,7 +38,6 @@ static struct ctl_table_header *fs_table_header;
 #define CODA_TIMEOUT    3       /* timeout on upcalls to become intrble */
 #define CODA_HARD       5       /* mount type "hard" or "soft" */
 #define CODA_VFS 	 6       /* vfs statistics */
-#define CODA_UPCALL 	 7       /* upcall statistics */
 #define CODA_CACHE_INV 	 9       /* cache invalidation statistics */
 #define CODA_FAKE_STATFS 10	 /* don't query venus for actual cache usage */
 
@@ -47,7 +45,6 @@ static ctl_table coda_table[] = {
  	{CODA_TIMEOUT, "timeout", &coda_timeout, sizeof(int), 0644, NULL, &proc_dointvec},
  	{CODA_HARD, "hard", &coda_hard, sizeof(int), 0644, NULL, &proc_dointvec},
  	{CODA_VFS, "vfs_stats", NULL, 0, 0644, NULL, &do_reset_coda_vfs_stats},
- 	{CODA_UPCALL, "upcall_stats", NULL, 0, 0644, NULL, &do_reset_coda_upcall_stats},
  	{CODA_CACHE_INV, "cache_inv_stats", NULL, 0, 0644, NULL, &do_reset_coda_cache_inv_stats},
  	{CODA_FAKE_STATFS, "fake_statfs", &coda_fake_statfs, sizeof(int), 0600, NULL, &proc_dointvec},
 	{ 0 }
@@ -60,152 +57,17 @@ static ctl_table fs_table[] = {
 
 struct coda_vfs_stats		coda_vfs_stat;
 struct coda_cache_inv_stats	coda_cache_inv_stat;
-struct coda_upcall_stats_entry  coda_upcall_stat[CODA_NCALLS];
-struct coda_upcallstats         coda_callstats;
-int                             coda_upcall_timestamping = 0;
-
-/* keep this in sync with coda.h! */
-char *coda_upcall_names[] = {
-	"totals      ",   /*  0 */
-	"-           ",   /*  1 */
-	"root        ",   /*  2 */
-	"open_by_fd  ",   /*  3 */
-	"open        ",   /*  4 */
-	"close       ",   /*  5 */
-	"ioctl       ",   /*  6 */
-	"getattr     ",   /*  7 */
-	"setattr     ",   /*  8 */
-	"access      ",   /*  9 */
-	"lookup      ",   /* 10 */
-	"create      ",   /* 11 */
-	"remove      ",   /* 12 */
-	"link        ",   /* 13 */
-	"rename      ",   /* 14 */
-	"mkdir       ",   /* 15 */
-	"rmdir       ",   /* 16 */
-	"readdir     ",   /* 17 */
-	"symlink     ",   /* 18 */
-	"readlink    ",   /* 19 */
-	"fsync       ",   /* 20 */
-	"-           ",   /* 21 */
-	"vget        ",   /* 22 */
-	"signal      ",   /* 23 */
-	"replace     ",   /* 24 */
-	"flush       ",   /* 25 */
-	"purgeuser   ",   /* 26 */
-	"zapfile     ",   /* 27 */
-	"zapdir      ",   /* 28 */
-	"-           ",   /* 29 */
-	"purgefid    ",   /* 30 */
-	"open_by_path",   /* 31 */
-	"resolve     ",   /* 32 */
-	"reintegrate ",   /* 33 */
-	"statfs      ",   /* 34 */
-	"store       ",   /* 35 */
-	"release     "    /* 36 */
-};
-
 
 void reset_coda_vfs_stats( void )
 {
 	memset( &coda_vfs_stat, 0, sizeof( coda_vfs_stat ) );
 }
 
-void reset_coda_upcall_stats( void )
-{
-	memset( &coda_upcall_stat, 0, sizeof( coda_upcall_stat ) );
-}
-
 void reset_coda_cache_inv_stats( void )
 {
 	memset( &coda_cache_inv_stat, 0, sizeof( coda_cache_inv_stat ) );
 }
 
-
-void do_time_stats( struct coda_upcall_stats_entry * pentry, 
-		    unsigned long runtime )
-{
-	unsigned long time = runtime;	/* time in us */
-
-	if ( pentry->count == 0 ) {
-		pentry->time_sum = pentry->time_squared_sum = 0;
-	}
-	
-	pentry->count++;
-	pentry->time_sum += time;
-	pentry->time_squared_sum += time*time;
-}
-
-
-
-void coda_upcall_stats(int opcode, long unsigned runtime) 
-{
-	struct coda_upcall_stats_entry * pentry;
-	
-	if ( opcode < 0 || opcode > CODA_NCALLS - 1) {
-		printk("Nasty opcode %d passed to coda_upcall_stats\n",
-		       opcode);
-		return;
-	}
-		
-	pentry = &coda_upcall_stat[opcode];
-	do_time_stats(pentry, runtime);
-
-        /* fill in the totals */
-	pentry = &coda_upcall_stat[0];
-	do_time_stats(pentry, runtime);
-
-}
-
-unsigned long get_time_average( const struct coda_upcall_stats_entry * pentry )
-{
-	return ( pentry->count == 0 ) ? 0 : pentry->time_sum / pentry->count;
-}
-
-static inline unsigned long absolute( unsigned long x )
-{
-	return x >= 0 ? x : -x;
-}
-
-static unsigned long sqr_root( unsigned long x )
-{
-	unsigned long y = x, r;
-	int n_bit = 0;
-  
-	if ( x == 0 )
-		return 0;
-	if ( x < 0)
-		x = -x;
-
-	while ( y ) {
-		y >>= 1;
-		n_bit++;
-	}
-  
-	r = 1 << (n_bit/2);
-  
-	while ( 1 ) {
-		r = (r + x/r)/2;
-		if ( r*r <= x && x < (r+1)*(r+1) )
-			break;
-	}
-  
-	return r;
-}
-
-unsigned long get_time_std_deviation( const struct coda_upcall_stats_entry * pentry )
-{
-	unsigned long time_avg;
-  
-	if ( pentry->count <= 1 )
-		return 0;
-  
-	time_avg = get_time_average( pentry );
-
-	return sqr_root( (pentry->time_squared_sum / pentry->count) - 
-			    time_avg * time_avg );
-}
-
 int do_reset_coda_vfs_stats( ctl_table * table, int write, struct file * filp,
 			     void * buffer, size_t * lenp )
 {
@@ -220,27 +82,6 @@ int do_reset_coda_vfs_stats( ctl_table * table, int write, struct file * filp,
 	return 0;
 }
 
-int do_reset_coda_upcall_stats( ctl_table * table, int write, 
-				struct file * filp, void * buffer, 
-				size_t * lenp )
-{
-	if ( write ) {
-        	if (*lenp > 0) {
-			char c;
-                	if (get_user(c, (char *)buffer))
-			       	return -EFAULT;
-                        coda_upcall_timestamping = (c == '1');
-                }
-		reset_coda_upcall_stats();
-
-		filp->f_pos += *lenp;
-	} else {
-		*lenp = 0;
-	}
-
-	return 0;
-}
-
 int do_reset_coda_cache_inv_stats( ctl_table * table, int write, 
 				   struct file * filp, void * buffer, 
 				   size_t * lenp )
@@ -317,52 +158,6 @@ int coda_vfs_stats_get_info( char * buffer, char ** start, off_t offset,
 	return len;
 }
 
-int coda_upcall_stats_get_info( char * buffer, char ** start, off_t offset,
-				int length)
-{
-	int len=0;
-	int i;
-	off_t begin;
-	off_t pos = 0;
-	char tmpbuf[80];
-	int tmplen = 0;
-
-	/* this works as long as we are below 1024 characters! */
-	if ( offset < 80 ) 
-		len += sprintf( buffer,"%-79s\n",	"Coda upcall statistics");
-	if ( offset < 160) 
-		len += sprintf( buffer + len,"%-79s\n",	"======================");
-	if ( offset < 240) 
-		len += sprintf( buffer + len,"%-79s\n",	"upcall              count       avg time(us)    std deviation(us)");
-	if ( offset < 320) 
-		len += sprintf( buffer + len,"%-79s\n",	"------              -----       ------------    -----------------");
-	pos = 320; 
-	for ( i = 0 ; i < CODA_NCALLS ; i++ ) {
-		tmplen += sprintf(tmpbuf,"%s    %9d       %10ld      %10ld", 
-				  coda_upcall_names[i],
-				  coda_upcall_stat[i].count, 
-				  get_time_average(&coda_upcall_stat[i]),
-				  coda_upcall_stat[i].time_squared_sum);
-		pos += 80;
-		if ( pos < offset ) 
-			continue; 
-		len += sprintf(buffer + len, "%-79s\n", tmpbuf);
-		if ( len >= length ) 
-			break; 
-	}
-  
-	begin = len- (pos - offset);
-	*start = buffer + begin;
-	len -= begin;
-
-	if ( len > length )
-		len = length;
-	if ( len < 0 )
-		len = 0;
-
-	return len;
-}
-
 int coda_cache_inv_stats_get_info( char * buffer, char ** start, off_t offset,
 				   int length)
 {
@@ -421,9 +216,7 @@ struct proc_dir_entry* proc_fs_coda;
 
 void coda_sysctl_init()
 {
-	memset(&coda_callstats, 0, sizeof(coda_callstats));
 	reset_coda_vfs_stats();
-	reset_coda_upcall_stats();
 	reset_coda_cache_inv_stats();
 
 #ifdef CONFIG_PROC_FS
@@ -431,7 +224,6 @@ void coda_sysctl_init()
 	if (proc_fs_coda) {
 		proc_fs_coda->owner = THIS_MODULE;
 		coda_proc_create("vfs_stats", coda_vfs_stats_get_info);
-		coda_proc_create("upcall_stats", coda_upcall_stats_get_info);
 		coda_proc_create("cache_inv_stats", coda_cache_inv_stats_get_info);
 	}
 #endif
@@ -454,7 +246,6 @@ void coda_sysctl_clean()
 
 #if CONFIG_PROC_FS
         remove_proc_entry("cache_inv_stats", proc_fs_coda);
-        remove_proc_entry("upcall_stats", proc_fs_coda);
         remove_proc_entry("vfs_stats", proc_fs_coda);
 	remove_proc_entry("coda", proc_root_fs);
 #endif 

fs/coda/upcall.c

@@ -171,10 +171,7 @@ int venus_store(struct super_block *sb, struct ViceFid *fid, int flags,
 	insize = SIZE(store);
 	UPARG(CODA_STORE);
 	
-	if ( cred ) {
 	memcpy(&(inp->ih.cred), cred, sizeof(*cred));
-	} else 
-		printk("CODA: store without valid file creds.\n");
 	
         inp->coda_store.VFid = *fid;
         inp->coda_store.flags = flags;
@@ -213,10 +210,7 @@ int venus_close(struct super_block *sb, struct ViceFid *fid, int flags,
 	insize = SIZE(release);
 	UPARG(CODA_CLOSE);
 	
-	if ( cred ) {
 	memcpy(&(inp->ih.cred), cred, sizeof(*cred));
-	} else 
-		printk("CODA: close without valid file creds.\n");
 	
         inp->coda_close.VFid = *fid;
         inp->coda_close.flags = flags;
@@ -620,17 +614,13 @@ int venus_statfs(struct super_block *sb, struct statfs *sfs)
  * 
  */
 
-static inline unsigned long coda_waitfor_upcall(struct upc_req *vmp,
+static inline void coda_waitfor_upcall(struct upc_req *vmp,
 				       struct venus_comm *vcommp)
 {
 	DECLARE_WAITQUEUE(wait, current);
- 	struct timeval begin = { 0, 0 }, end = { 0, 0 };
 
 	vmp->uc_posttime = jiffies;
 
-	if (coda_upcall_timestamping)
-		do_gettimeofday(&begin);
-
 	add_wait_queue(&vmp->uc_sleep, &wait);
 	for (;;) {
 		if ( !coda_hard && vmp->uc_opcode != CODA_CLOSE ) 
@@ -661,17 +651,7 @@ static inline unsigned long coda_waitfor_upcall(struct upc_req *vmp,
 	remove_wait_queue(&vmp->uc_sleep, &wait);
 	set_current_state(TASK_RUNNING);
 
-	if (coda_upcall_timestamping && begin.tv_sec != 0) {
-		do_gettimeofday(&end);
-
-		if (end.tv_usec < begin.tv_usec) {
-			end.tv_usec += 1000000; end.tv_sec--;
-		}
-		end.tv_sec  -= begin.tv_sec;
-		end.tv_usec -= begin.tv_usec;
-	}
-
-	return 	((end.tv_sec * 1000000) + end.tv_usec);
+	return;
 }
 
 
@@ -689,7 +669,6 @@ static int coda_upcall(struct coda_sb_info *sbi,
 		int inSize, int *outSize, 
 		union inputArgs *buffer) 
 {
-	unsigned long runtime; 
 	struct venus_comm *vcommp;
 	union outputArgs *out;
 	struct upc_req *req;
@@ -732,8 +711,7 @@ static int coda_upcall(struct coda_sb_info *sbi,
 	 * ENODEV.  */
 
 	/* Go to sleep.  Wake up on signals only after the timeout. */
-	runtime = coda_waitfor_upcall(req, vcommp);
-	coda_upcall_stats(((union inputArgs *)buffer)->ih.opcode, runtime);
+	coda_waitfor_upcall(req, vcommp);
 
 	if (vcommp->vc_inuse) {      /* i.e. Venus is still alive */
 	    /* Op went through, interrupt or not... */
@@ -794,8 +772,6 @@ static int coda_upcall(struct coda_sb_info *sbi,
 
  exit:
 	upc_free(req);
-	if (error) 
-	        badclstats();
 	return error;
 }
 
@@ -842,7 +818,6 @@ int coda_downcall(int opcode, union outputArgs * out, struct super_block *sb)
 	  switch (opcode) {
 
 	  case CODA_FLUSH : {
-	           clstats(CODA_FLUSH);
 		   coda_cache_clear_all(sb, NULL);
 		   shrink_dcache_sb(sb);
 		   coda_flag_inode(sb->s_root->d_inode, C_FLUSH);
@@ -855,7 +830,6 @@ int coda_downcall(int opcode, union outputArgs * out, struct super_block *sb)
 		           printk("PURGEUSER: null cred!\n");
 			   return 0;
 		   }
-		   clstats(CODA_PURGEUSER);
 		   coda_cache_clear_all(sb, cred);
 		   return(0);
 	  }
@@ -863,7 +837,6 @@ int coda_downcall(int opcode, union outputArgs * out, struct super_block *sb)
 	  case CODA_ZAPDIR : {
 	          struct inode *inode;
 		  ViceFid *fid = &out->coda_zapdir.CodaFid;
-		  clstats(CODA_ZAPDIR);
 
 		  inode = coda_fid_to_inode(fid, sb);
 		  if (inode) {
@@ -878,7 +851,6 @@ int coda_downcall(int opcode, union outputArgs * out, struct super_block *sb)
 	  case CODA_ZAPFILE : {
 	          struct inode *inode;
 		  struct ViceFid *fid = &out->coda_zapfile.CodaFid;
-		  clstats(CODA_ZAPFILE);
 		  inode = coda_fid_to_inode(fid, sb);
 		  if ( inode ) {
 	                  coda_flag_inode(inode, C_VATTR);
@@ -890,7 +862,6 @@ int coda_downcall(int opcode, union outputArgs * out, struct super_block *sb)
 	  case CODA_PURGEFID : {
 	          struct inode *inode;
 		  ViceFid *fid = &out->coda_purgefid.CodaFid;
-		  clstats(CODA_PURGEFID);
 		  inode = coda_fid_to_inode(fid, sb);
 		  if ( inode ) { 
 			coda_flag_inode_children(inode, C_PURGE);
@@ -908,7 +879,6 @@ int coda_downcall(int opcode, union outputArgs * out, struct super_block *sb)
 	          struct inode *inode;
 		  ViceFid *oldfid = &out->coda_replace.OldFid;
 		  ViceFid *newfid = &out->coda_replace.NewFid;
-		  clstats(CODA_REPLACE);
 		  inode = coda_fid_to_inode(oldfid, sb);
 		  if ( inode ) { 
 			  coda_replace_fid(inode, oldfid, newfid);

include/linux/coda_fs_i.h

@@ -20,13 +20,25 @@ struct coda_inode_info {
         struct ViceFid     c_fid;	/* Coda identifier */
         u_short	           c_flags;     /* flags (see below) */
 	struct list_head   c_cilist;    /* list of all coda inodes */
-	struct file	  *c_container; /* container file for this cnode */
-	unsigned int       c_contcount; /* refcount for container file */
+	unsigned int	   c_mapcount;  /* nr of times this inode is mapped */
         struct coda_cred   c_cached_cred; /* credentials of cached perms */
         unsigned int       c_cached_perm; /* cached access permissions */
 	struct inode	   vfs_inode;
 };
 
+/*
+ * coda fs file private data
+ */
+#define CODA_MAGIC 0xC0DAC0DA
+struct coda_file_info {
+	int		   cfi_magic;	  /* magic number */
+	struct file	  *cfi_container; /* container file for this cnode */
+	unsigned int	   cfi_mapcount;  /* nr of times this file is mapped */
+	struct coda_cred   cfi_cred;      /* credentials of opener */
+};
+
+#define CODA_FTOC(file) ((struct coda_file_info *)((file)->private_data))
+
 /* flags */
 #define C_VATTR       0x1   /* Validity of vattr in inode */
 #define C_FLUSH       0x2   /* used after a flush */

include/linux/coda_linux.h

@@ -21,6 +21,7 @@
 #include <linux/wait.h>		
 #include <linux/types.h>
 #include <linux/fs.h>
+#include <linux/coda_fs_i.h>
 
 /* operations */
 extern struct inode_operations coda_dir_inode_operations;
@@ -45,7 +46,6 @@ int coda_setattr(struct dentry *, struct iattr *);
 int coda_isnullfid(ViceFid *fid);
 
 /* global variables */
-extern int coda_access_cache;
 extern int coda_fake_statfs;
 
 /* this file:  heloers */
@@ -53,7 +53,6 @@ static __inline__ struct ViceFid *coda_i2f(struct inode *);
 static __inline__ char *coda_i2s(struct inode *);
 static __inline__ void coda_flag_inode(struct inode *, int flag);
 char *coda_f2s(ViceFid *f);
-char *coda_f2s2(ViceFid *f);
 int coda_isroot(struct inode *i);
 int coda_iscontrol(const char *name, size_t length);
 

include/linux/coda_proc.h

@@ -14,7 +14,6 @@
 
 void coda_sysctl_init(void);
 void coda_sysctl_clean(void);
-void coda_upcall_stats(int opcode, unsigned long jiffies);
 
 #include <linux/sysctl.h>
 #include <linux/coda_fs_i.h>
@@ -23,13 +22,11 @@ void coda_upcall_stats(int opcode, unsigned long jiffies);
 /* these four files are presented to show the result of the statistics:
  *
  *	/proc/fs/coda/vfs_stats
- *		      upcall_stats
  *		      cache_inv_stats
  *
  * these four files are presented to reset the statistics to 0:
  *
  *	/proc/sys/coda/vfs_stats
- *		       upcall_stats
  *		       cache_inv_stats
  */
 
@@ -61,13 +58,6 @@ struct coda_vfs_stats
 	int readlink;
 };
 
-struct coda_upcall_stats_entry 
-{
-  int count;
-  unsigned long time_sum;
-  unsigned long time_squared_sum;
-};
-
 /* cache invalidation statistics */
 struct coda_cache_inv_stats
 {
@@ -83,31 +73,16 @@ struct coda_cache_inv_stats
 /* these global variables hold the actual statistics data */
 extern struct coda_vfs_stats		coda_vfs_stat;
 extern struct coda_cache_inv_stats	coda_cache_inv_stat;
-extern int				coda_upcall_timestamping;
 
 /* reset statistics to 0 */
 void reset_coda_vfs_stats( void );
-void reset_coda_upcall_stats( void );
 void reset_coda_cache_inv_stats( void );
 
-/* some utitlities to make it easier for you to do statistics for time */
-void do_time_stats( struct coda_upcall_stats_entry * pentry, 
-		    unsigned long jiffy );
-/*
-double get_time_average( const struct coda_upcall_stats_entry * pentry );
-double get_time_std_deviation( const struct coda_upcall_stats_entry * pentry );
-*/
-unsigned long get_time_average( const struct coda_upcall_stats_entry * pentry );
-unsigned long get_time_std_deviation( const struct coda_upcall_stats_entry * pentry );
-
 /* like coda_dointvec, these functions are to be registered in the ctl_table
  * data structure for /proc/sys/... files 
  */
 int do_reset_coda_vfs_stats( ctl_table * table, int write, struct file * filp,
 			     void * buffer, size_t * lenp );
-int do_reset_coda_upcall_stats( ctl_table * table, int write, 
-				struct file * filp, void * buffer, 
-				size_t * lenp );
 int do_reset_coda_cache_inv_stats( ctl_table * table, int write, 
 				   struct file * filp, void * buffer, 
 				   size_t * lenp );
@@ -115,8 +90,6 @@ int do_reset_coda_cache_inv_stats( ctl_table * table, int write,
 /* these functions are called to form the content of /proc/fs/coda/... files */
 int coda_vfs_stats_get_info( char * buffer, char ** start, off_t offset,
 			     int length);
-int coda_upcall_stats_get_info( char * buffer, char ** start, off_t offset,
-				int length);
 int coda_cache_inv_stats_get_info( char * buffer, char ** start, off_t offset,
 				   int length);
 

include/linux/coda_psdev.h

@@ -98,27 +98,7 @@ struct upc_req {
 /*
  * Statistics
  */
-struct coda_upcallstats {
-	int	ncalls;			/* client requests */
-	int	nbadcalls;		/* upcall failures */
-	int	reqs[CODA_NCALLS];	/* count of each request */
-} ;
 
-extern struct coda_upcallstats coda_callstats;
 extern struct venus_comm coda_comms[];
 
-static inline void clstats(int opcode)
-{
-    coda_callstats.ncalls++;
-    if ( (0 <= opcode) && (opcode <= CODA_NCALLS) )
-	coda_callstats.reqs[opcode]++;
-    else
-	printk("clstats called with bad opcode %d\n", opcode); 
-}
-
-static inline void badclstats(void)
-{
-    coda_callstats.nbadcalls++;
-}
-
 #endif