Skip to content

L
linux
Commit 060a98d5 authored by Alexander Viro's avatar Alexander Viro Committed by Linus Torvalds
Browse files
Options

[PATCH] removal of fcb horror 

	"fcb" killed; stuff that used to be handled by it (block/char/regular)
moved into the same union where the rest of cases are handled.
parent e98181ff
Show whitespace changes
Inline Side-by-side
Showing with 90 additions and 114 deletions
fs/devfs/base.c
View file @ 060a98d5
......@@ -763,26 +763,25 @@ struct directory_type
struct file_type
{
struct file_operations *ops;
unsigned long size;
};
struct device_type
struct bdev_type
{
struct block_device_operations *ops;
unsigned short major;
unsigned short minor;
unsigned char autogen:1;
unsigned char removable:1;
};
struct fcb_type /* File, char, block type */
struct cdev_type
{
void *ops;
union
{
struct file_type file;
struct device_type device;
}
u;
unsigned char removable:1; /* Belongs in device_type, but save space */
unsigned char autogen:1; /* Belongs in device_type, but save space */
struct file_operations *ops;
unsigned short major;
unsigned short minor;
unsigned char autogen:1;
};
struct symlink_type
......@@ -812,7 +811,9 @@ struct devfs_entry
union
{
struct directory_type dir;
struct fcb_type fcb;
struct file_type file;
struct bdev_type bdev;
struct cdev_type cdev;
struct symlink_type symlink;
const char *name; /* Only used for (mode == 0) */
}
......@@ -935,12 +936,17 @@ void devfs_put (devfs_handle_t de)
de->name, de, de->parent,
de->parent ? de->parent->name : "no parent");
if ( S_ISLNK (de->mode) ) kfree (de->u.symlink.linkname);
if ( ( S_ISCHR (de->mode) || S_ISBLK (de->mode) ) && de->u.fcb.autogen )
if ( S_ISCHR (de->mode) && de->u.cdev.autogen )
{
devfs_dealloc_devnum ( S_ISCHR (de->mode) ? DEVFS_SPECIAL_CHR :
DEVFS_SPECIAL_BLK,
mk_kdev (de->u.fcb.u.device.major,
de->u.fcb.u.device.minor) );
devfs_dealloc_devnum ( DEVFS_SPECIAL_CHR,
mk_kdev (de->u.cdev.major,
de->u.cdev.minor) );
}
if ( S_ISBLK (de->mode) && de->u.bdev.autogen )
{
devfs_dealloc_devnum ( DEVFS_SPECIAL_BLK,
mk_kdev (de->u.bdev.major,
de->u.bdev.minor) );
}
WRITE_ENTRY_MAGIC (de, 0);
#ifdef CONFIG_DEVFS_DEBUG
......@@ -1108,17 +1114,17 @@ static struct devfs_entry *_devfs_get_root_entry (void)
if ( ( new = _devfs_alloc_entry (".devfsd", 0, S_IFCHR |S_IRUSR |S_IWUSR) )
== NULL ) return NULL;
devnum = devfs_alloc_devnum (DEVFS_SPECIAL_CHR);
new->u.fcb.u.device.major = major (devnum);
new->u.fcb.u.device.minor = minor (devnum);
new->u.fcb.ops = &devfsd_fops;
new->u.cdev.major = major (devnum);
new->u.cdev.minor = minor (devnum);
new->u.cdev.ops = &devfsd_fops;
_devfs_append_entry (root_entry, new, FALSE, NULL);
#ifdef CONFIG_DEVFS_DEBUG
if ( ( new = _devfs_alloc_entry (".stat", 0, S_IFCHR | S_IRUGO | S_IWUGO) )
== NULL ) return NULL;
devnum = devfs_alloc_devnum (DEVFS_SPECIAL_CHR);
new->u.fcb.u.device.major = major (devnum);
new->u.fcb.u.device.minor = minor (devnum);
new->u.fcb.ops = &stat_fops;
new->u.cdev.major = major (devnum);
new->u.cdev.minor = minor (devnum);
new->u.cdev.ops = &stat_fops;
_devfs_append_entry (root_entry, new, FALSE, NULL);
#endif
return root_entry;
......@@ -1521,14 +1527,20 @@ devfs_handle_t devfs_register (devfs_handle_t dir, const char *name,
if ( !kdev_none (devnum) ) devfs_dealloc_devnum (devtype, devnum);
return NULL;
}
if ( S_ISCHR (mode) || S_ISBLK (mode) )
{
de->u.fcb.u.device.major = major;
de->u.fcb.u.device.minor = minor;
de->u.fcb.autogen = kdev_none (devnum) ? FALSE : TRUE;
}
else if ( !S_ISREG (mode) )
{
if (S_ISCHR (mode)) {
de->u.cdev.major = major;
de->u.cdev.minor = minor;
de->u.cdev.autogen = kdev_none (devnum) ? FALSE : TRUE;
de->u.cdev.ops = ops;
} else if (S_ISBLK (mode)) {
de->u.bdev.major = major;
de->u.bdev.minor = minor;
de->u.bdev.autogen = kdev_none (devnum) ? FALSE : TRUE;
de->u.bdev.ops = ops;
if (flags & DEVFS_FL_REMOVABLE) de->u.bdev.removable = TRUE;
} else if ( S_ISREG (mode) ) {
de->u.file.ops = ops;
} else {
PRINTK ("(%s): illegal mode: %x\n", name, mode);
devfs_put (de);
devfs_put (dir);
......@@ -1545,10 +1557,8 @@ devfs_handle_t devfs_register (devfs_handle_t dir, const char *name,
de->inode.uid = 0;
de->inode.gid = 0;
}
de->u.fcb.ops = ops;
if (flags & DEVFS_FL_REMOVABLE) de->u.fcb.removable = TRUE;
if ( ( err = _devfs_append_entry (dir, de, de->u.fcb.removable, NULL) )
!= 0 )
err = _devfs_append_entry(dir, de, flags & DEVFS_FL_REMOVABLE, NULL);
if (err)
{
PRINTK ("(%s): could not append to parent, err: %d\n", name, err);
devfs_put (dir);
......@@ -1584,8 +1594,7 @@ static int _devfs_unhook (struct devfs_entry *de)
else de->next->prev = de->prev;
de->prev = de; /* Indicate we're unhooked */
de->next = NULL; /* Force early termination for <devfs_readdir> */
if ( ( S_ISREG (de->mode) || S_ISCHR (de->mode) || S_ISBLK (de->mode) ) &&
de->u.fcb.removable )
if (S_ISBLK (de->mode) && de->u.bdev.removable )
--parent->u.dir.num_removable;
return TRUE;
} /* End Function _devfs_unhook */
......@@ -1872,53 +1881,30 @@ int devfs_generate_path (devfs_handle_t de, char *path, int buflen)
* The use count for the module owning the operations will be incremented.
*/
void *devfs_get_ops (devfs_handle_t de)
static struct file_operations *devfs_get_ops (devfs_handle_t de)
{
struct module *owner;
struct file_operations *ops;
if (de == NULL) return NULL;
VERIFY_ENTRY (de);
if ( !S_ISCHR (de->mode) && !S_ISBLK (de->mode) && !S_ISREG (de->mode) )
if (S_ISCHR (de->mode))
ops = de->u.cdev.ops;
else
ops = de->u.file.ops;
if (!ops)
return NULL;
if (de->u.fcb.ops == NULL) return NULL;
owner = ops->owner;
read_lock (&de->parent->u.dir.lock); /* Prevent module from unloading */
if (de->next == de) owner = NULL; /* Ops pointer is already stale */
else if ( S_ISCHR (de->mode) || S_ISREG (de->mode) )
owner = ( (struct file_operations *) de->u.fcb.ops )->owner;
else owner = ( (struct block_device_operations *) de->u.fcb.ops )->owner;
if ( (de->next == de) || !try_inc_mod_count (owner) )
{ /* Entry is already unhooked or module is unloading */
read_unlock (&de->parent->u.dir.lock);
return NULL;
}
read_unlock (&de->parent->u.dir.lock); /* Module can continue unloading*/
return de->u.fcb.ops;
return ops;
} /* End Function devfs_get_ops */
/**
* devfs_put_ops - Put the device operations for a devfs entry.
* @de: The handle to the device entry.
*
* The use count for the module owning the operations will be decremented.
*/
void devfs_put_ops (devfs_handle_t de)
{
struct module *owner;
if (de == NULL) return;
VERIFY_ENTRY (de);
if ( !S_ISCHR (de->mode) && !S_ISBLK (de->mode) && !S_ISREG (de->mode) )
return;
if (de->u.fcb.ops == NULL) return;
if ( S_ISCHR (de->mode) || S_ISREG (de->mode) )
owner = ( (struct file_operations *) de->u.fcb.ops )->owner;
else owner = ( (struct block_device_operations *) de->u.fcb.ops )->owner;
if (owner) __MOD_DEC_USE_COUNT (owner);
} /* End Function devfs_put_ops */
/**
* devfs_set_file_size - Set the file size for a devfs regular file.
* @de: The handle to the device entry.
......@@ -1932,8 +1918,8 @@ int devfs_set_file_size (devfs_handle_t de, unsigned long size)
if (de == NULL) return -EINVAL;
VERIFY_ENTRY (de);
if ( !S_ISREG (de->mode) ) return -EINVAL;
if (de->u.fcb.u.file.size == size) return 0;
de->u.fcb.u.file.size = size;
if (de->u.file.size == size) return 0;
de->u.file.size = size;
if (de->inode.dentry == NULL) return 0;
if (de->inode.dentry->d_inode == NULL) return 0;
de->inode.dentry->d_inode->i_size = size;
......@@ -2119,7 +2105,6 @@ EXPORT_SYMBOL(devfs_get_handle);
EXPORT_SYMBOL(devfs_remove);
EXPORT_SYMBOL(devfs_get_handle_from_inode);
EXPORT_SYMBOL(devfs_generate_path);
EXPORT_SYMBOL(devfs_get_ops);
EXPORT_SYMBOL(devfs_set_file_size);
EXPORT_SYMBOL(devfs_get_info);
EXPORT_SYMBOL(devfs_set_info);
......@@ -2177,7 +2162,7 @@ static int check_disc_changed (struct devfs_entry *de)
{
int tmp;
int retval = 0;
dev_t dev = MKDEV(de->u.fcb.u.device.major, de->u.fcb.u.device.minor);
dev_t dev = MKDEV(de->u.bdev.major, de->u.bdev.minor);
extern int warn_no_part;
if (!S_ISBLK(de->mode))
......@@ -2209,7 +2194,7 @@ static void scan_dir_for_removable (struct devfs_entry *dir)
{
for (de = dir->u.dir.first; de != NULL; de = de->next)
{
if (S_ISBLK (de->mode) && de->u.fcb.removable) break;
if (S_ISBLK (de->mode) && de->u.bdev.removable) break;
}
devfs_get (de);
}
......@@ -2244,7 +2229,7 @@ static int get_removable_partition (struct devfs_entry *dir, const char *name,
}
for (de = dir->u.dir.first; de != NULL; de = de->next)
{
if (!S_ISBLK (de->mode) || !de->u.fcb.removable) continue;
if (!S_ISBLK (de->mode) || !de->u.bdev.removable) continue;
if (strcmp (de->name, "disc") == 0) break;
/* Support for names where the partition is appended to the disc name
*/
......@@ -2326,7 +2311,6 @@ static struct inode *_devfs_get_vfs_inode (struct super_block *sb,
struct devfs_entry *de,
struct dentry *dentry)
{
int is_fcb = FALSE;
struct inode *inode;
if (de->prev == de) return NULL; /* Quick check to see if unhooked */
......@@ -2358,24 +2342,21 @@ static struct inode *_devfs_get_vfs_inode (struct super_block *sb,
inode->i_rdev = NODEV;
if ( S_ISCHR (de->mode) )
{
inode->i_rdev = mk_kdev (de->u.fcb.u.device.major,
de->u.fcb.u.device.minor);
inode->i_rdev = mk_kdev (de->u.cdev.major,
de->u.cdev.minor);
inode->i_cdev = cdget ( kdev_t_to_nr (inode->i_rdev) );
is_fcb = TRUE;
}
else if ( S_ISBLK (de->mode) )
{
inode->i_rdev = mk_kdev (de->u.fcb.u.device.major,
de->u.fcb.u.device.minor);
inode->i_rdev = mk_kdev (de->u.bdev.major,
de->u.bdev.minor);
if (bd_acquire (inode) != 0)
PRINTK ("(%d): no block device from bdget()\n",(int)inode->i_ino);
is_fcb = TRUE;
}
else if ( S_ISFIFO (de->mode) ) inode->i_fop = &def_fifo_fops;
else if ( S_ISREG (de->mode) )
{
inode->i_size = de->u.fcb.u.file.size;
is_fcb = TRUE;
inode->i_size = de->u.file.size;
}
else if ( S_ISDIR (de->mode) )
{
......@@ -2466,25 +2447,20 @@ static int devfs_readdir (struct file *file, void *dirent, filldir_t filldir)
static int devfs_open (struct inode *inode, struct file *file)
{
int err;
struct fcb_type *df;
int err = -ENODEV;
struct devfs_entry *de;
struct fs_info *fs_info = inode->i_sb->s_fs_info;
void *ops;
struct file_operations *ops;
de = get_devfs_entry_from_vfs_inode (inode);
if (de == NULL) return -ENODEV;
if ( S_ISDIR (de->mode) ) return 0;
df = &de->u.fcb;
file->private_data = de->info;
ops = devfs_get_ops (de); /* Now have module refcount */
if ( S_ISBLK (inode->i_mode) )
{
file->f_op = &def_blk_fops;
err = def_blk_fops.open (inode, file); /* Module refcount unchanged */
}
else
{
} else if (S_ISCHR(inode->i_mode)) {
ops = devfs_get_ops (de); /* Now have module refcount */
file->f_op = ops;
if (file->f_op)
{
......@@ -2493,9 +2469,15 @@ static int devfs_open (struct inode *inode, struct file *file)
unlock_kernel ();
}
else
{ /* Fallback to legacy scheme (I don't have a module refcount) */
if ( S_ISCHR (inode->i_mode) ) err = chrdev_open (inode, file);
else err = -ENODEV;
err = chrdev_open (inode, file);
} else if (S_ISREG(inode->i_mode)) {
ops = devfs_get_ops (de); /* Now have module refcount */
file->f_op = ops;
if (file->f_op)
{
lock_kernel ();
err = file->f_op->open ? (*file->f_op->open) (inode, file) : 0;
unlock_kernel ();
}
}
return err;
......@@ -2865,10 +2847,12 @@ static int devfs_mknod (struct inode *dir, struct dentry *dentry, int mode,
de = _devfs_alloc_entry (dentry->d_name.name, dentry->d_name.len, mode);
if (!de) return -ENOMEM;
de->vfs_deletable = TRUE;
if ( S_ISBLK (mode) || S_ISCHR (mode) )
{
de->u.fcb.u.device.major = MAJOR (rdev);
de->u.fcb.u.device.minor = MINOR (rdev);
if (S_ISCHR (mode)) {
de->u.cdev.major = MAJOR (rdev);
de->u.cdev.minor = MINOR (rdev);
} else if (S_ISBLK (mode)) {
de->u.bdev.major = MAJOR (rdev);
de->u.bdev.minor = MINOR (rdev);
}
if ( ( err = _devfs_append_entry (parent, de, FALSE, NULL) ) != 0 )
return err;
......@@ -3021,10 +3005,12 @@ static ssize_t devfsd_read (struct file *file, char *buf, size_t len,
info->uid = entry->uid;
info->gid = entry->gid;
de = entry->de;
if ( S_ISCHR (de->mode) || S_ISBLK (de->mode) )
{
info->major = de->u.fcb.u.device.major;
info->minor = de->u.fcb.u.device.minor;
if (S_ISCHR(de->mode)) {
info->major = de->u.cdev.major;
info->minor = de->u.cdev.minor;
} else if (S_ISBLK (de->mode)) {
info->major = de->u.bdev.major;
info->minor = de->u.bdev.minor;
}
pos = devfs_generate_path (de, info->devname, DEVFS_PATHLEN);
if (pos < 0) return pos;
......
include/linux/devfs_fs_kernel.h
View file @ 060a98d5
......@@ -57,8 +57,6 @@ extern devfs_handle_t devfs_get_handle (devfs_handle_t dir, const char *name,
int traverse_symlinks);
extern devfs_handle_t devfs_get_handle_from_inode (struct inode *inode);
extern int devfs_generate_path (devfs_handle_t de, char *path, int buflen);
extern void *devfs_get_ops (devfs_handle_t de);
extern void devfs_put_ops (devfs_handle_t de);
extern int devfs_set_file_size (devfs_handle_t de, unsigned long size);
extern void *devfs_get_info (devfs_handle_t de);
extern int devfs_set_info (devfs_handle_t de, void *info);
......@@ -140,14 +138,6 @@ static inline int devfs_generate_path (devfs_handle_t de, char *path,
{
return -ENOSYS;
}
static inline void *devfs_get_ops (devfs_handle_t de)
{
return NULL;
}
static inline void devfs_put_ops (devfs_handle_t de)
{
return;
}
static inline int devfs_set_file_size (devfs_handle_t de, unsigned long size)
{
return -ENOSYS;
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7