Coda: push BKL regions into coda_upcall()

Now that shared inode state is locked using the cii->c_lock, the BKL is
only used to protect the upcall queues used to communicate with the
userspace cache manager. The remaining state is all local and we can
push the lock further down into coda_upcall().

Signed-off-by: Yoshihisa Abe <yoshiabe@cs.cmu.edu>
Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 42 insertions, 107 deletions

diff --git a/fs/coda/dir.c b/fs/coda/dir.c
index 69fbbea..96fbeab 100644
--- a/fs/coda/dir.c
+++ b/fs/coda/dir.c
@@ -17,7 +17,6 @@
 #include <linux/stat.h>
 #include <linux/errno.h>
 #include <linux/string.h>
-#include <linux/smp_lock.h>
 #include <linux/spinlock.h>
 
 #include <asm/uaccess.h>
@@ -117,15 +116,11 @@ static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, struc
 		goto exit;
 	}
 
-	lock_kernel();
-
 	error = venus_lookup(dir->i_sb, coda_i2f(dir), name, length,
 			     &type, &resfid);
 	if (!error)
 		error = coda_cnode_make(&inode, &resfid, dir->i_sb);
 
-	unlock_kernel();
-
 	if (error && error != -ENOENT)
 		return ERR_PTR(error);
 
@@ -141,28 +136,24 @@ exit:
 
 int coda_permission(struct inode *inode, int mask)
 {
-        int error = 0;
+	int error;
 
 	mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
  
 	if (!mask)
-		return 0; 
+		return 0;
 
 	if ((mask & MAY_EXEC) && !execute_ok(inode))
 		return -EACCES;
 
-	lock_kernel();
-
 	if (coda_cache_check(inode, mask))
-		goto out; 
+		return 0;
 
-        error = venus_access(inode->i_sb, coda_i2f(inode), mask);
+	error = venus_access(inode->i_sb, coda_i2f(inode), mask);
     
 	if (!error)
 		coda_cache_enter(inode, mask);
 
- out:
-	unlock_kernel();
 	return error;
 }
 
@@ -201,41 +192,34 @@ static inline void coda_dir_drop_nlink(struct inode *dir)
 /* creation routines: create, mknod, mkdir, link, symlink */
 static int coda_create(struct inode *dir, struct dentry *de, int mode, struct nameidata *nd)
 {
-        int error=0;
+	int error;
 	const char *name=de->d_name.name;
 	int length=de->d_name.len;
 	struct inode *inode;
 	struct CodaFid newfid;
 	struct coda_vattr attrs;
 
-	lock_kernel();
-
-	if (coda_isroot(dir) && coda_iscontrol(name, length)) {
-		unlock_kernel();
+	if (coda_isroot(dir) && coda_iscontrol(name, length))
 		return -EPERM;
-	}
 
 	error = venus_create(dir->i_sb, coda_i2f(dir), name, length, 
 				0, mode, &newfid, &attrs);
-
-        if ( error ) {
-		unlock_kernel();
-		d_drop(de);
-		return error;
-	}
+	if (error)
+		goto err_out;
 
 	inode = coda_iget(dir->i_sb, &newfid, &attrs);
-	if ( IS_ERR(inode) ) {
-		unlock_kernel();
-		d_drop(de);
-		return PTR_ERR(inode);
+	if (IS_ERR(inode)) {
+		error = PTR_ERR(inode);
+		goto err_out;
 	}
 
 	/* invalidate the directory cnode's attributes */
 	coda_dir_update_mtime(dir);
-	unlock_kernel();
 	d_instantiate(de, inode);
 	return 0;
+err_out:
+	d_drop(de);
+	return error;
 }
 
 static int coda_mkdir(struct inode *dir, struct dentry *de, int mode)
@@ -247,36 +231,29 @@ static int coda_mkdir(struct inode *dir, struct dentry *de, int mode)
 	int error;
 	struct CodaFid newfid;
 
-	lock_kernel();
-
-	if (coda_isroot(dir) && coda_iscontrol(name, len)) {
-		unlock_kernel();
+	if (coda_isroot(dir) && coda_iscontrol(name, len))
 		return -EPERM;
-	}
 
 	attrs.va_mode = mode;
 	error = venus_mkdir(dir->i_sb, coda_i2f(dir), 
 			       name, len, &newfid, &attrs);
-        
-        if ( error ) {
-		unlock_kernel();
-		d_drop(de);
-		return error;
-        }
+	if (error)
+		goto err_out;
          
 	inode = coda_iget(dir->i_sb, &newfid, &attrs);
-	if ( IS_ERR(inode) ) {
-		unlock_kernel();
-		d_drop(de);
-		return PTR_ERR(inode);
+	if (IS_ERR(inode)) {
+		error = PTR_ERR(inode);
+		goto err_out;
 	}
 
 	/* invalidate the directory cnode's attributes */
 	coda_dir_inc_nlink(dir);
 	coda_dir_update_mtime(dir);
-	unlock_kernel();
 	d_instantiate(de, inode);
 	return 0;
+err_out:
+	d_drop(de);
+	return error;
 }
 
 /* try to make de an entry in dir_inodde linked to source_de */ 
@@ -288,52 +265,38 @@ static int coda_link(struct dentry *source_de, struct inode *dir_inode,
 	int len = de->d_name.len;
 	int error;
 
-	lock_kernel();
-
-	if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) {
-		unlock_kernel();
+	if (coda_isroot(dir_inode) && coda_iscontrol(name, len))
 		return -EPERM;
-	}
 
 	error = venus_link(dir_inode->i_sb, coda_i2f(inode),
 			   coda_i2f(dir_inode), (const char *)name, len);
-
 	if (error) {
 		d_drop(de);
-		goto out;
+		return error;
 	}
 
 	coda_dir_update_mtime(dir_inode);
 	atomic_inc(&inode->i_count);
 	d_instantiate(de, inode);
 	inc_nlink(inode);
-
-out:
-	unlock_kernel();
-	return(error);
+	return 0;
 }
 
 
 static int coda_symlink(struct inode *dir_inode, struct dentry *de,
 			const char *symname)
 {
-        const char *name = de->d_name.name;
+	const char *name = de->d_name.name;
 	int len = de->d_name.len;
 	int symlen;
-	int error = 0;
-
-	lock_kernel();
+	int error;
 
-	if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) {
-		unlock_kernel();
+	if (coda_isroot(dir_inode) && coda_iscontrol(name, len))
 		return -EPERM;
-	}
 
 	symlen = strlen(symname);
-	if ( symlen > CODA_MAXPATHLEN ) {
-		unlock_kernel();
+	if (symlen > CODA_MAXPATHLEN)
 		return -ENAMETOOLONG;
-	}
 
 	/*
 	 * This entry is now negative. Since we do not create
@@ -344,10 +307,9 @@ static int coda_symlink(struct inode *dir_inode, struct dentry *de,
 			      symname, symlen);
 
 	/* mtime is no good anymore */
-	if ( !error )
+	if (!error)
 		coda_dir_update_mtime(dir_inode);
 
-	unlock_kernel();
 	return error;
 }
 
@@ -358,17 +320,12 @@ static int coda_unlink(struct inode *dir, struct dentry *de)
 	const char *name = de->d_name.name;
 	int len = de->d_name.len;
 
-	lock_kernel();
-
 	error = venus_remove(dir->i_sb, coda_i2f(dir), name, len);
-	if ( error ) {
-		unlock_kernel();
+	if (error)
 		return error;
-	}
 
 	coda_dir_update_mtime(dir);
 	drop_nlink(de->d_inode);
-	unlock_kernel();
 	return 0;
 }
 
@@ -378,8 +335,6 @@ static int coda_rmdir(struct inode *dir, struct dentry *de)
 	int len = de->d_name.len;
 	int error;
 
-	lock_kernel();
-
 	error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len);
 	if (!error) {
 		/* VFS may delete the child */
@@ -390,7 +345,6 @@ static int coda_rmdir(struct inode *dir, struct dentry *de)
 		coda_dir_drop_nlink(dir);
 		coda_dir_update_mtime(dir);
 	}
-	unlock_kernel();
 	return error;
 }
 
@@ -404,15 +358,12 @@ static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
 	int new_length = new_dentry->d_name.len;
 	int error;
 
-	lock_kernel();
-
 	error = venus_rename(old_dir->i_sb, coda_i2f(old_dir),
 			     coda_i2f(new_dir), old_length, new_length,
 			     (const char *) old_name, (const char *)new_name);
-
-	if ( !error ) {
-		if ( new_dentry->d_inode ) {
-			if ( S_ISDIR(new_dentry->d_inode->i_mode) ) {
+	if (!error) {
+		if (new_dentry->d_inode) {
+			if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 				coda_dir_drop_nlink(old_dir);
 				coda_dir_inc_nlink(new_dir);
 			}
@@ -424,8 +375,6 @@ static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
 			coda_flag_inode(new_dir, C_VATTR);
 		}
 	}
-	unlock_kernel();
-
 	return error;
 }
 
@@ -595,10 +544,7 @@ static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd)
 	struct inode *inode = de->d_inode;
 	struct coda_inode_info *cii;
 
-	if (!inode)
-		return 1;
-	lock_kernel();
-	if (coda_isroot(inode))
+	if (!inode || coda_isroot(inode))
 		goto out;
 	if (is_bad_inode(inode))
 		goto bad;
@@ -621,12 +567,9 @@ static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd)
 	spin_lock(&cii->c_lock);
 	cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
 	spin_unlock(&cii->c_lock);
-
 bad:
-	unlock_kernel();
 	return 0;
 out:
-	unlock_kernel();
 	return 1;
 }
 
@@ -659,20 +602,19 @@ static int coda_dentry_delete(struct dentry * dentry)
 int coda_revalidate_inode(struct dentry *dentry)
 {
 	struct coda_vattr attr;
-	int error = 0;
+	int error;
 	int old_mode;
 	ino_t old_ino;
 	struct inode *inode = dentry->d_inode;
 	struct coda_inode_info *cii = ITOC(inode);
 
-	lock_kernel();
-	if ( !cii->c_flags )
-		goto ok;
+	if (!cii->c_flags)
+		return 0;
 
 	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;
+		if (error)
+			return -EIO;
 
 		/* this inode may be lost if:
 		   - it's ino changed 
@@ -691,7 +633,7 @@ 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;
+			return -EIO;
 		
 		coda_flag_inode_children(inode, C_FLUSH);
 
@@ -699,12 +641,5 @@ int coda_revalidate_inode(struct dentry *dentry)
 		cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
 		spin_unlock(&cii->c_lock);
 	}
-
-ok:
-	unlock_kernel();
 	return 0;
-
-return_bad:
-	unlock_kernel();
-	return -EIO;
 }