X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Fcoda%2Fdir.c;h=f89ff083079ba5b8fd1595f233c3c9b949d472de;hb=488fd99588bf23da951b524a806e44feaa1aa366;hp=56a3b76b91cadd37ca32412d6ae6406591c0d09a;hpb=d728900cd5502927158db747c653007cf72e2e49;p=linux-2.6

diff --git a/fs/coda/dir.c b/fs/coda/dir.c
index 56a3b76b91..f89ff08307 100644
--- a/fs/coda/dir.c
+++ b/fs/coda/dir.c
@@ -25,7 +25,6 @@
 #include <linux/coda_psdev.h>
 #include <linux/coda_fs_i.h>
 #include <linux/coda_cache.h>
-#include <linux/coda_proc.h>
 
 #include "coda_int.h"
 
@@ -43,15 +42,15 @@ static int coda_rename(struct inode *old_inode, struct dentry *old_dentry,
                        struct inode *new_inode, struct dentry *new_dentry);
 
 /* dir file-ops */
-static int coda_readdir(struct file *file, void *dirent, filldir_t filldir);
+static int coda_readdir(struct file *file, void *buf, filldir_t filldir);
 
 /* dentry ops */
 static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd);
 static int coda_dentry_delete(struct dentry *);
 
 /* support routines */
-static int coda_venus_readdir(struct file *filp, filldir_t filldir,
-			      void *dirent, struct dentry *dir);
+static int coda_venus_readdir(struct file *coda_file, void *buf,
+			      filldir_t filldir);
 
 /* same as fs/bad_inode.c */
 static int coda_return_EIO(void)
@@ -87,7 +86,6 @@ const 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,
 };
@@ -97,58 +95,45 @@ const struct file_operations coda_dir_operations = {
 /* access routines: lookup, readlink, permission */
 static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, struct nameidata *nd)
 {
-	struct inode *res_inode = NULL;
+	struct inode *inode = NULL;
 	struct CodaFid resfid = { { 0, } };
-	int dropme = 0; /* to indicate entry should not be cached */
 	int type = 0;
 	int error = 0;
 	const char *name = entry->d_name.name;
 	size_t length = entry->d_name.len;
-	
-	if ( length > CODA_MAXNAMLEN ) {
-	        printk("name too long: lookup, %s (%*s)\n", 
+
+	if (length > CODA_MAXNAMLEN) {
+		printk(KERN_ERR "name too long: lookup, %s (%*s)\n",
 		       coda_i2s(dir), (int)length, name);
 		return ERR_PTR(-ENAMETOOLONG);
 	}
 
+	/* control object, create inode on the fly */
+	if (coda_isroot(dir) && coda_iscontrol(name, length)) {
+		error = coda_cnode_makectl(&inode, dir->i_sb);
+		type = CODA_NOCACHE;
+		goto exit;
+	}
+
 	lock_kernel();
-        /* control object, create inode on the fly */
-        if (coda_isroot(dir) && coda_iscontrol(name, length)) {
-	        error = coda_cnode_makectl(&res_inode, dir->i_sb);
-		dropme = 1;
-                goto exit;
-        }
 
-	error = venus_lookup(dir->i_sb, coda_i2f(dir), 
-			     (const char *)name, length, &type, &resfid);
+	error = venus_lookup(dir->i_sb, coda_i2f(dir), name, length,
+			     &type, &resfid);
+	if (!error)
+		error = coda_cnode_make(&inode, &resfid, dir->i_sb);
 
-	res_inode = NULL;
-	if (!error) {
-		if (type & CODA_NOCACHE) {
-			type &= (~CODA_NOCACHE);
-			dropme = 1;
-		}
+	unlock_kernel();
 
-	    	error = coda_cnode_make(&res_inode, &resfid, dir->i_sb);
-		if (error) {
-			unlock_kernel();
-			return ERR_PTR(error);
-		}
-	} else if (error != -ENOENT) {
-		unlock_kernel();
+	if (error && error != -ENOENT)
 		return ERR_PTR(error);
-	}
 
 exit:
-	entry->d_time = 0;
 	entry->d_op = &coda_dentry_operations;
-	d_add(entry, res_inode);
-	if ( dropme ) {
-		d_drop(entry);
-		coda_flag_inode(res_inode, C_VATTR);
-	}
-	unlock_kernel();
-        return NULL;
+
+	if (inode && (type & CODA_NOCACHE))
+		coda_flag_inode(inode, C_VATTR | C_PURGE);
+
+	return d_splice_alias(inode, entry);
 }
 
 
@@ -161,8 +146,6 @@ int coda_permission(struct inode *inode, int mask, struct nameidata *nd)
 
 	lock_kernel();
 
-	coda_vfs_stat.permission++;
-
 	if (coda_cache_check(inode, mask))
 		goto out; 
 
@@ -219,7 +202,6 @@ static int coda_create(struct inode *dir, struct dentry *de, int mode, struct na
 	struct coda_vattr attrs;
 
 	lock_kernel();
-	coda_vfs_stat.create++;
 
 	if (coda_isroot(dir) && coda_iscontrol(name, length)) {
 		unlock_kernel();
@@ -259,7 +241,6 @@ static int coda_mkdir(struct inode *dir, struct dentry *de, int mode)
 	struct CodaFid newfid;
 
 	lock_kernel();
-	coda_vfs_stat.mkdir++;
 
 	if (coda_isroot(dir) && coda_iscontrol(name, len)) {
 		unlock_kernel();
@@ -301,7 +282,6 @@ static int coda_link(struct dentry *source_de, struct inode *dir_inode,
 	int error;
 
 	lock_kernel();
-	coda_vfs_stat.link++;
 
 	if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) {
 		unlock_kernel();
@@ -333,10 +313,9 @@ static int coda_symlink(struct inode *dir_inode, struct dentry *de,
         const char *name = de->d_name.name;
 	int len = de->d_name.len;
 	int symlen;
-        int error=0;
-        
+	int error = 0;
+
 	lock_kernel();
-	coda_vfs_stat.symlink++;
 
 	if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) {
 		unlock_kernel();
@@ -373,7 +352,6 @@ int coda_unlink(struct inode *dir, struct dentry *de)
 	int len = de->d_name.len;
 
 	lock_kernel();
-	coda_vfs_stat.unlink++;
 
 	error = venus_remove(dir->i_sb, coda_i2f(dir), name, len);
 	if ( error ) {
@@ -391,28 +369,22 @@ int coda_rmdir(struct inode *dir, struct dentry *de)
 {
 	const char *name = de->d_name.name;
 	int len = de->d_name.len;
-        int error;
+	int error;
 
 	lock_kernel();
-	coda_vfs_stat.rmdir++;
 
-	if (!d_unhashed(de)) {
-		unlock_kernel();
-		return -EBUSY;
-	}
 	error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len);
+	if (!error) {
+		/* VFS may delete the child */
+		if (de->d_inode)
+		    de->d_inode->i_nlink = 0;
 
-	if ( error ) {
-		unlock_kernel();
-		return error;
+		/* fix the link count of the parent */
+		coda_dir_drop_nlink(dir);
+		coda_dir_update_mtime(dir);
 	}
-
-	coda_dir_drop_nlink(dir);
-	coda_dir_update_mtime(dir);
-	drop_nlink(de->d_inode);
-	d_delete(de);
 	unlock_kernel();
-	return 0;
+	return error;
 }
 
 /* rename */
@@ -426,7 +398,6 @@ static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
 	int error;
 
 	lock_kernel();
-	coda_vfs_stat.rename++;
 
 	error = venus_rename(old_dir->i_sb, coda_i2f(old_dir),
 			     coda_i2f(new_dir), old_length, new_length,
@@ -453,44 +424,41 @@ 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 coda_readdir(struct file *coda_file, void *buf, filldir_t filldir)
 {
-	struct dentry *coda_dentry = coda_file->f_path.dentry;
 	struct coda_file_info *cfi;
 	struct file *host_file;
-	struct inode *host_inode;
 	int ret;
 
 	cfi = CODA_FTOC(coda_file);
 	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
 	host_file = cfi->cfi_container;
 
-	coda_vfs_stat.readdir++;
-
-	host_inode = host_file->f_path.dentry->d_inode;
-	mutex_lock(&host_inode->i_mutex);
-	host_file->f_pos = coda_file->f_pos;
-
-	if (!host_file->f_op->readdir) {
-		/* Venus: we must read Venus dirents from the file */
-		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;
+	if (!host_file->f_op)
+		return -ENOTDIR;
+
+	if (host_file->f_op->readdir)
+	{
+		/* potemkin case: we were handed a directory inode.
+		 * We can't use vfs_readdir because we have to keep the file
+		 * position in sync between the coda_file and the host_file.
+		 * and as such we need grab the inode mutex. */
+		struct inode *host_inode = host_file->f_path.dentry->d_inode;
+
+		mutex_lock(&host_inode->i_mutex);
+		host_file->f_pos = coda_file->f_pos;
 
 		ret = -ENOENT;
 		if (!IS_DEADDIR(host_inode)) {
-			ret = host_file->f_op->readdir(host_file, dirent, filldir);
+			ret = host_file->f_op->readdir(host_file, buf, filldir);
 			file_accessed(host_file);
 		}
+
+		coda_file->f_pos = host_file->f_pos;
+		mutex_unlock(&host_inode->i_mutex);
 	}
-out:
-	coda_file->f_pos = host_file->f_pos;
-	mutex_unlock(&host_inode->i_mutex);
+	else /* Venus: we must read Venus dirents from a file */
+		ret = coda_venus_readdir(coda_file, buf, filldir);
 
 	return ret;
 }
@@ -515,57 +483,68 @@ static inline unsigned int CDT2DT(unsigned char cdt)
 }
 
 /* support routines */
-static int coda_venus_readdir(struct file *filp, filldir_t filldir,
-			      void *dirent, struct dentry *dir)
+static int coda_venus_readdir(struct file *coda_file, void *buf,
+			      filldir_t filldir)
 {
 	int result = 0; /* # of entries returned */
+	struct coda_file_info *cfi;
+	struct coda_inode_info *cii;
+	struct file *host_file;
+	struct dentry *de;
 	struct venus_dirent *vdir;
 	unsigned long vdir_size =
 	    (unsigned long)(&((struct venus_dirent *)0)->d_name);
 	unsigned int type;
 	struct qstr name;
 	ino_t ino;
-	int ret, i;
+	int ret;
+
+	cfi = CODA_FTOC(coda_file);
+	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
+	host_file = cfi->cfi_container;
+
+	de = coda_file->f_path.dentry;
+	cii = ITOC(de->d_inode);
 
 	vdir = kmalloc(sizeof(*vdir), GFP_KERNEL);
 	if (!vdir) return -ENOMEM;
 
-	i = filp->f_pos;
-	switch(i) {
-	case 0:
-		ret = filldir(dirent, ".", 1, 0, dir->d_inode->i_ino, DT_DIR);
-		if (ret < 0) break;
+	if (coda_file->f_pos == 0) {
+		ret = filldir(buf, ".", 1, 0, de->d_inode->i_ino, DT_DIR);
+		if (ret < 0)
+			goto out;
 		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;
+		coda_file->f_pos++;
+	}
+	if (coda_file->f_pos == 1) {
+		ret = filldir(buf, "..", 2, 1, de->d_parent->d_inode->i_ino, DT_DIR);
+		if (ret < 0)
+			goto out;
 		result++;
-		filp->f_pos++;
-		/* fallthrough */
-	default:
+		coda_file->f_pos++;
+	}
 	while (1) {
 		/* read entries from the directory file */
-		ret = kernel_read(filp, filp->f_pos - 2, (char *)vdir,
+		ret = kernel_read(host_file, coda_file->f_pos - 2, (char *)vdir,
 				  sizeof(*vdir));
 		if (ret < 0) {
-			printk("coda_venus_readdir: read dir failed %d\n", ret);
+			printk(KERN_ERR "coda readdir: read dir %s failed %d\n",
+			       coda_f2s(&cii->c_fid), ret);
 			break;
 		}
 		if (ret == 0) break; /* end of directory file reached */
 
 		/* catch truncated reads */
 		if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) {
-			printk("coda_venus_readdir: short read: %ld\n",
-			       filp->f_path.dentry->d_inode->i_ino);
+			printk(KERN_ERR "coda readdir: short read on %s\n",
+			       coda_f2s(&cii->c_fid));
 			ret = -EBADF;
 			break;
 		}
 		/* validate whether the directory file actually makes sense */
 		if (vdir->d_reclen < vdir_size + vdir->d_namlen) {
-			printk("coda_venus_readdir: Invalid dir: %ld\n",
-			       filp->f_path.dentry->d_inode->i_ino);
+			printk(KERN_ERR "coda readdir: invalid dir %s\n",
+			       coda_f2s(&cii->c_fid));
 			ret = -EBADF;
 			break;
 		}
@@ -584,21 +563,21 @@ static int coda_venus_readdir(struct file *filp, filldir_t filldir,
 			 * userspace doesn't have to worry about breaking
 			 * getcwd by having mismatched inode numbers for
 			 * internal volume mountpoints. */
-			ino = find_inode_number(dir, &name);
+			ino = find_inode_number(de, &name);
 			if (!ino) ino = vdir->d_fileno;
 
 			type = CDT2DT(vdir->d_type);
-			ret = filldir(dirent, name.name, name.len, filp->f_pos,
-				      ino, type); 
+			ret = filldir(buf, name.name, name.len,
+				      coda_file->f_pos, ino, type);
 			/* failure means no space for filling in this round */
 			if (ret < 0) break;
 			result++;
 		}
 		/* we'll always have progress because d_reclen is unsigned and
 		 * we've already established it is non-zero. */
-		filp->f_pos += vdir->d_reclen;
+		coda_file->f_pos += vdir->d_reclen;
 	}
-	} 
+out:
 	kfree(vdir);
 	return result ? result : ret;
 }