[PATCH] inode-diet: Eliminate i_blksize from the inode structure

[safe/jmp/linux-2.6] / fs / hostfs / hostfs_kern.c

diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 14a0d33..322e876 100644 (file)
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -8,14 +8,12 @@
 
 #include <linux/stddef.h>
 #include <linux/fs.h>
-#include <linux/version.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/pagemap.h>
 #include <linux/blkdev.h>
 #include <linux/list.h>
-#include <linux/root_dev.h>
 #include <linux/statfs.h>
 #include <linux/kdev_t.h>
 #include <asm/uaccess.h>
@@ -23,7 +21,6 @@
 #include "kern_util.h"
 #include "kern.h"
 #include "user_util.h"
-#include "2_5compat.h"
 #include "init.h"
 
 struct hostfs_inode_info {
@@ -57,7 +54,7 @@ static int append = 0;
 
 static struct inode_operations hostfs_iops;
 static struct inode_operations hostfs_dir_iops;
-static struct address_space_operations hostfs_link_aops;
+static const struct address_space_operations hostfs_link_aops;
 
 #ifndef MODULE
 static int __init hostfs_args(char *options, int *add)
@@ -159,10 +156,7 @@ static int read_name(struct inode *ino, char *name)
        ino->i_mode = i_mode;
        ino->i_nlink = i_nlink;
        ino->i_size = i_size;
-       ino->i_blksize = i_blksize;
        ino->i_blocks = i_blocks;
-       if((ino->i_sb->s_dev == ROOT_DEV) && (ino->i_uid == getuid()))
-               ino->i_uid = 0;
        return(0);
 }
 
@@ -244,7 +238,7 @@ static int read_inode(struct inode *ino)
        return(err);
 }
 
-int hostfs_statfs(struct super_block *sb, struct kstatfs *sf)
+int hostfs_statfs(struct dentry *dentry, struct kstatfs *sf)
 {
        /* do_statfs uses struct statfs64 internally, but the linux kernel
         * struct statfs still has 32-bit versions for most of these fields,
@@ -257,7 +251,7 @@ int hostfs_statfs(struct super_block *sb, struct kstatfs *sf)
        long long f_files;
        long long f_ffree;
 
-       err = do_statfs(HOSTFS_I(sb->s_root->d_inode)->host_filename,
+       err = do_statfs(HOSTFS_I(dentry->d_sb->s_root->d_inode)->host_filename,
                        &sf->f_bsize, &f_blocks, &f_bfree, &f_bavail, &f_files,
                        &f_ffree, &sf->f_fsid, sizeof(sf->f_fsid),
                        &sf->f_namelen, sf->f_spare);
@@ -288,6 +282,7 @@ static struct inode *hostfs_alloc_inode(struct super_block *sb)
 
 static void hostfs_delete_inode(struct inode *inode)
 {
+       truncate_inode_pages(&inode->i_data, 0);
        if(HOSTFS_I(inode)->fd != -1) {
                close_file(&HOSTFS_I(inode)->fd);
                HOSTFS_I(inode)->fd = -1;
@@ -297,8 +292,7 @@ static void hostfs_delete_inode(struct inode *inode)
 
 static void hostfs_destroy_inode(struct inode *inode)
 {
-       if(HOSTFS_I(inode)->host_filename)
-               kfree(HOSTFS_I(inode)->host_filename);
+       kfree(HOSTFS_I(inode)->host_filename);
 
        /*XXX: This should not happen, probably. The check is here for
         * additional safety.*/
@@ -386,10 +380,10 @@ int hostfs_file_open(struct inode *ino, struct file *file)
 
 int hostfs_fsync(struct file *file, struct dentry *dentry, int datasync)
 {
-       return(0);
+       return fsync_file(HOSTFS_I(dentry->d_inode)->fd, datasync);
 }
 
-static struct file_operations hostfs_file_fops = {
+static const struct file_operations hostfs_file_fops = {
        .llseek         = generic_file_llseek,
        .read           = generic_file_read,
        .sendfile       = generic_file_sendfile,
@@ -404,7 +398,7 @@ static struct file_operations hostfs_file_fops = {
        .fsync          = hostfs_fsync,
 };
 
-static struct file_operations hostfs_dir_fops = {
+static const struct file_operations hostfs_dir_fops = {
        .llseek         = generic_file_llseek,
        .readdir        = hostfs_readdir,
        .read           = generic_read_dir,
@@ -506,11 +500,16 @@ int hostfs_commit_write(struct file *file, struct page *page, unsigned from,
        long long start;
        int err = 0;
 
-       start = (long long) (page->index << PAGE_CACHE_SHIFT) + from;
+       start = (((long long) page->index) << PAGE_CACHE_SHIFT) + from;
        buffer = kmap(page);
        err = write_file(FILE_HOSTFS_I(file)->fd, &start, buffer + from,
                         to - from);
        if(err > 0) err = 0;
+
+       /* Actually, if !err, write_file has added to-from to start, so, despite
+        * the appearance, we are comparing i_size against the _last_ written
+        * location, as we should. */
+
        if(!err && (start > inode->i_size))
                inode->i_size = start;
 
@@ -518,7 +517,7 @@ int hostfs_commit_write(struct file *file, struct page *page, unsigned from,
        return(err);
 }
 
-static struct address_space_operations hostfs_aops = {
+static const struct address_space_operations hostfs_aops = {
        .writepage      = hostfs_writepage,
        .readpage       = hostfs_readpage,
        .set_page_dirty = __set_page_dirty_nobuffers,
@@ -796,11 +795,6 @@ int hostfs_rename(struct inode *from_ino, struct dentry *from,
        return(err);
 }
 
-void hostfs_truncate(struct inode *ino)
-{
-       not_implemented();
-}
-
 int hostfs_permission(struct inode *ino, int desired, struct nameidata *nd)
 {
        char *name;
@@ -842,16 +836,10 @@ int hostfs_setattr(struct dentry *dentry, struct iattr *attr)
                attrs.ia_mode = attr->ia_mode;
        }
        if(attr->ia_valid & ATTR_UID){
-               if((dentry->d_inode->i_sb->s_dev == ROOT_DEV) &&
-                  (attr->ia_uid == 0))
-                       attr->ia_uid = getuid();
                attrs.ia_valid |= HOSTFS_ATTR_UID;
                attrs.ia_uid = attr->ia_uid;
        }
        if(attr->ia_valid & ATTR_GID){
-               if((dentry->d_inode->i_sb->s_dev == ROOT_DEV) &&
-                  (attr->ia_gid == 0))
-                       attr->ia_gid = getgid();
                attrs.ia_valid |= HOSTFS_ATTR_GID;
                attrs.ia_gid = attr->ia_gid;
        }
@@ -903,7 +891,6 @@ static struct inode_operations hostfs_iops = {
        .rmdir          = hostfs_rmdir,
        .mknod          = hostfs_mknod,
        .rename         = hostfs_rename,
-       .truncate       = hostfs_truncate,
        .permission     = hostfs_permission,
        .setattr        = hostfs_setattr,
        .getattr        = hostfs_getattr,
@@ -919,7 +906,6 @@ static struct inode_operations hostfs_dir_iops = {
        .rmdir          = hostfs_rmdir,
        .mknod          = hostfs_mknod,
        .rename         = hostfs_rename,
-       .truncate       = hostfs_truncate,
        .permission     = hostfs_permission,
        .setattr        = hostfs_setattr,
        .getattr        = hostfs_getattr,
@@ -928,10 +914,8 @@ static struct inode_operations hostfs_dir_iops = {
 int hostfs_link_readpage(struct file *file, struct page *page)
 {
        char *buffer, *name;
-       long long start;
        int err;
 
-       start = page->index << PAGE_CACHE_SHIFT;
        buffer = kmap(page);
        name = inode_name(page->mapping->host, 0);
        if(name == NULL) return(-ENOMEM);
@@ -950,7 +934,7 @@ int hostfs_link_readpage(struct file *file, struct page *page)
        return(err);
 }
 
-static struct address_space_operations hostfs_link_aops = {
+static const struct address_space_operations hostfs_link_aops = {
        .readpage       = hostfs_link_readpage,
 };
 
@@ -1008,11 +992,11 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent)
        return(err);
 }
 
-static struct super_block *hostfs_read_sb(struct file_system_type *type,
-                                            int flags, const char *dev_name,
-                                            void *data)
+static int hostfs_read_sb(struct file_system_type *type,
+                         int flags, const char *dev_name,
+                         void *data, struct vfsmount *mnt)
 {
-       return(get_sb_nodev(type, flags, data, hostfs_fill_sb_common));
+       return get_sb_nodev(type, flags, data, hostfs_fill_sb_common, mnt);
 }
 
 static struct file_system_type hostfs_type = {