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Merge branch 'debugfs_automount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Browse Source 
Pull debugfs patches from Al Viro:
 "debugfs patches, mostly to make it possible for something like tracefs
  to be transparently automounted on given directory in debugfs.

  New primitive in there is debugfs_create_automount(name, parent, func,
  arg), which creates a directory and makes its ->d_automount() return
  func(arg).  Another missing primitive was debugfs_create_file_size() -
  open-coded in quite a few places.  Dave's patch adds it and converts
  the open-code instances to calling it"

* 'debugfs_automount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  debugfs: Provide a file creation function that also takes an initial size
  new primitive: debugfs_create_automount()
  debugfs: split end_creating() into success and failure cases
  debugfs: take mode-dependent parts of debugfs_get_inode() into callers
  fold debugfs_mknod() into callers
  fold debugfs_create() into caller
  fold debugfs_mkdir() into caller
  debugfs_mknod(): get rid useless arguments
  fold debugfs_link() into caller
  debugfs: kill __create_file()
  debugfs: split the beginning and the end of __create_file() off
  debugfs_{mkdir,create,link}(): get rid of redundant argument
This commit is contained in:
Linus Torvalds 2015-02-17 15:18:19 -08:00
commit c6b1de1b64
6 changed files with 212 additions and 165 deletions
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35
drivers/infiniband/hw/cxgb4/device.c
View File

@ -700,37 +700,24 @@ static const struct file_operations ep_debugfs_fops = {
static int setup_debugfs(struct c4iw_dev *devp)
{
struct dentry *de;
if (!devp->debugfs_root)
return -1;
de = debugfs_create_file("qps", S_IWUSR, devp->debugfs_root,
(void *)devp, &qp_debugfs_fops);
if (de && de->d_inode)
de->d_inode->i_size = 4096;
debugfs_create_file_size("qps", S_IWUSR, devp->debugfs_root,
(void *)devp, &qp_debugfs_fops, 4096);
de = debugfs_create_file("stags", S_IWUSR, devp->debugfs_root,
(void *)devp, &stag_debugfs_fops);
if (de && de->d_inode)
de->d_inode->i_size = 4096;
debugfs_create_file_size("stags", S_IWUSR, devp->debugfs_root,
(void *)devp, &stag_debugfs_fops, 4096);
de = debugfs_create_file("stats", S_IWUSR, devp->debugfs_root,
(void *)devp, &stats_debugfs_fops);
if (de && de->d_inode)
de->d_inode->i_size = 4096;
debugfs_create_file_size("stats", S_IWUSR, devp->debugfs_root,
(void *)devp, &stats_debugfs_fops, 4096);
de = debugfs_create_file("eps", S_IWUSR, devp->debugfs_root,
(void *)devp, &ep_debugfs_fops);
if (de && de->d_inode)
de->d_inode->i_size = 4096;
debugfs_create_file_size("eps", S_IWUSR, devp->debugfs_root,
(void *)devp, &ep_debugfs_fops, 4096);
if (c4iw_wr_log) {
de = debugfs_create_file("wr_log", S_IWUSR, devp->debugfs_root,
(void *)devp, &wr_log_debugfs_fops);
if (de && de->d_inode)
de->d_inode->i_size = 4096;
}
if (c4iw_wr_log)
debugfs_create_file_size("wr_log", S_IWUSR, devp->debugfs_root,
(void *)devp, &wr_log_debugfs_fops, 4096);
return 0;
}

9
drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
View File

@ -1950,12 +1950,9 @@ static void set_debugfs_file_size(struct dentry *de, loff_t size)
static void add_debugfs_mem(struct adapter *adap, const char *name,
unsigned int idx, unsigned int size_mb)
{
struct dentry *de;
de = debugfs_create_file(name, S_IRUSR, adap->debugfs_root,
(void *)adap + idx, &mem_debugfs_fops);
if (de && de->d_inode)
de->d_inode->i_size = size_mb << 20;
debugfs_create_file_size(name, S_IRUSR, adap->debugfs_root,
(void *)adap + idx, &mem_debugfs_fops,
size_mb << 20);
}
/* Add an array of Debug FS files.

9
drivers/scsi/csiostor/csio_init.c
View File

@ -113,12 +113,9 @@ static const struct file_operations csio_mem_debugfs_fops = {
void csio_add_debugfs_mem(struct csio_hw *hw, const char *name,
unsigned int idx, unsigned int size_mb)
{
struct dentry *de;
de = debugfs_create_file(name, S_IRUSR, hw->debugfs_root,
(void *)hw + idx, &csio_mem_debugfs_fops);
if (de && de->d_inode)
de->d_inode->i_size = size_mb << 20;
debugfs_create_file_size(name, S_IRUSR, hw->debugfs_root,
(void *)hw + idx, &csio_mem_debugfs_fops,
size_mb << 20);
}
static int csio_setup_debugfs(struct csio_hw *hw)

15
drivers/usb/gadget/udc/atmel_usba_udc.c
View File

@ -265,14 +265,17 @@ static void usba_init_debugfs(struct usba_udc *udc)
goto err_root;
udc->debugfs_root = root;
regs = debugfs_create_file("regs", 0400, root, udc, &regs_dbg_fops);
if (!regs)
goto err_regs;
regs_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,
CTRL_IOMEM_ID);
regs->d_inode->i_size = resource_size(regs_resource);
udc->debugfs_regs = regs;
if (regs_resource) {
regs = debugfs_create_file_size("regs", 0400, root, udc,
&regs_dbg_fops,
resource_size(regs_resource));
if (!regs)
goto err_regs;
udc->debugfs_regs = regs;
}
usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));

291
fs/debugfs/inode.c
View File

@ -34,93 +34,16 @@ static struct vfsmount *debugfs_mount;
static int debugfs_mount_count;
static bool debugfs_registered;
static struct inode *debugfs_get_inode(struct super_block *sb, umode_t mode, dev_t dev,
void *data, const struct file_operations *fops)
static struct inode *debugfs_get_inode(struct super_block *sb)
{
struct inode *inode = new_inode(sb);
if (inode) {
inode->i_ino = get_next_ino();
inode->i_mode = mode;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
switch (mode & S_IFMT) {
default:
init_special_inode(inode, mode, dev);
break;
case S_IFREG:
inode->i_fop = fops ? fops : &debugfs_file_operations;
inode->i_private = data;
break;
case S_IFLNK:
inode->i_op = &debugfs_link_operations;
inode->i_private = data;
break;
case S_IFDIR:
inode->i_op = &simple_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
/* directory inodes start off with i_nlink == 2
* (for "." entry) */
inc_nlink(inode);
break;
}
}
return inode;
}
/* SMP-safe */
static int debugfs_mknod(struct inode *dir, struct dentry *dentry,
umode_t mode, dev_t dev, void *data,
const struct file_operations *fops)
{
struct inode *inode;
int error = -EPERM;
if (dentry->d_inode)
return -EEXIST;
inode = debugfs_get_inode(dir->i_sb, mode, dev, data, fops);
if (inode) {
d_instantiate(dentry, inode);
dget(dentry);
error = 0;
}
return error;
}
static int debugfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
int res;
mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR;
res = debugfs_mknod(dir, dentry, mode, 0, NULL, NULL);
if (!res) {
inc_nlink(dir);
fsnotify_mkdir(dir, dentry);
}
return res;
}
static int debugfs_link(struct inode *dir, struct dentry *dentry, umode_t mode,
void *data)
{
mode = (mode & S_IALLUGO) | S_IFLNK;
return debugfs_mknod(dir, dentry, mode, 0, data, NULL);
}
static int debugfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
void *data, const struct file_operations *fops)
{
int res;
mode = (mode & S_IALLUGO) | S_IFREG;
res = debugfs_mknod(dir, dentry, mode, 0, data, fops);
if (!res)
fsnotify_create(dir, dentry);
return res;
}
static inline int debugfs_positive(struct dentry *dentry)
{
return dentry->d_inode && !d_unhashed(dentry);
@ -252,6 +175,18 @@ static const struct super_operations debugfs_super_operations = {
.show_options = debugfs_show_options,
};
static struct vfsmount *debugfs_automount(struct path *path)
{
struct vfsmount *(*f)(void *);
f = (struct vfsmount *(*)(void *))path->dentry->d_fsdata;
return f(path->dentry->d_inode->i_private);
}
static const struct dentry_operations debugfs_dops = {
.d_delete = always_delete_dentry,
.d_automount = debugfs_automount,
};
static int debug_fill_super(struct super_block *sb, void *data, int silent)
{
static struct tree_descr debug_files[] = {{""}};
@ -276,6 +211,7 @@ static int debug_fill_super(struct super_block *sb, void *data, int silent)
goto fail;
sb->s_op = &debugfs_super_operations;
sb->s_d_op = &debugfs_dops;
debugfs_apply_options(sb);
@ -302,11 +238,9 @@ static struct file_system_type debug_fs_type = {
};
MODULE_ALIAS_FS("debugfs");
static struct dentry *__create_file(const char *name, umode_t mode,
struct dentry *parent, void *data,
const struct file_operations *fops)
static struct dentry *start_creating(const char *name, struct dentry *parent)
{
struct dentry *dentry = NULL;
struct dentry *dentry;
int error;
pr_debug("debugfs: creating file '%s'\n",name);
@ -314,7 +248,7 @@ static struct dentry *__create_file(const char *name, umode_t mode,
error = simple_pin_fs(&debug_fs_type, &debugfs_mount,
&debugfs_mount_count);
if (error)
goto exit;
return ERR_PTR(error);
/* If the parent is not specified, we create it in the root.
* We need the root dentry to do this, which is in the super
@ -326,31 +260,26 @@ static struct dentry *__create_file(const char *name, umode_t mode,
mutex_lock(&parent->d_inode->i_mutex);
dentry = lookup_one_len(name, parent, strlen(name));
if (!IS_ERR(dentry)) {
switch (mode & S_IFMT) {
case S_IFDIR:
error = debugfs_mkdir(parent->d_inode, dentry, mode);
break;
case S_IFLNK:
error = debugfs_link(parent->d_inode, dentry, mode,
data);
break;
default:
error = debugfs_create(parent->d_inode, dentry, mode,
data, fops);
break;
}
if (!IS_ERR(dentry) && dentry->d_inode) {
dput(dentry);
} else
error = PTR_ERR(dentry);
mutex_unlock(&parent->d_inode->i_mutex);
if (error) {
dentry = NULL;
simple_release_fs(&debugfs_mount, &debugfs_mount_count);
dentry = ERR_PTR(-EEXIST);
}
exit:
if (IS_ERR(dentry))
mutex_unlock(&parent->d_inode->i_mutex);
return dentry;
}
static struct dentry *failed_creating(struct dentry *dentry)
{
mutex_unlock(&dentry->d_parent->d_inode->i_mutex);
dput(dentry);
simple_release_fs(&debugfs_mount, &debugfs_mount_count);
return NULL;
}
static struct dentry *end_creating(struct dentry *dentry)
{
mutex_unlock(&dentry->d_parent->d_inode->i_mutex);
return dentry;
}
@ -384,18 +313,70 @@ struct dentry *debugfs_create_file(const char *name, umode_t mode,
struct dentry *parent, void *data,
const struct file_operations *fops)
{
switch (mode & S_IFMT) {
case S_IFREG:
case 0:
break;
default:
BUG();
}
struct dentry *dentry;
struct inode *inode;
return __create_file(name, mode, parent, data, fops);
if (!(mode & S_IFMT))
mode |= S_IFREG;
BUG_ON(!S_ISREG(mode));
dentry = start_creating(name, parent);
if (IS_ERR(dentry))
return NULL;
inode = debugfs_get_inode(dentry->d_sb);
if (unlikely(!inode))
return failed_creating(dentry);
inode->i_mode = mode;
inode->i_fop = fops ? fops : &debugfs_file_operations;
inode->i_private = data;
d_instantiate(dentry, inode);
fsnotify_create(dentry->d_parent->d_inode, dentry);
return end_creating(dentry);
}
EXPORT_SYMBOL_GPL(debugfs_create_file);
/**
* debugfs_create_file_size - create a file in the debugfs filesystem
* @name: a pointer to a string containing the name of the file to create.
* @mode: the permission that the file should have.
* @parent: a pointer to the parent dentry for this file. This should be a
* directory dentry if set. If this parameter is NULL, then the
* file will be created in the root of the debugfs filesystem.
* @data: a pointer to something that the caller will want to get to later
* on. The inode.i_private pointer will point to this value on
* the open() call.
* @fops: a pointer to a struct file_operations that should be used for
* this file.
* @file_size: initial file size
*
* This is the basic "create a file" function for debugfs. It allows for a
* wide range of flexibility in creating a file, or a directory (if you want
* to create a directory, the debugfs_create_dir() function is
* recommended to be used instead.)
*
* This function will return a pointer to a dentry if it succeeds. This
* pointer must be passed to the debugfs_remove() function when the file is
* to be removed (no automatic cleanup happens if your module is unloaded,
* you are responsible here.) If an error occurs, %NULL will be returned.
*
* If debugfs is not enabled in the kernel, the value -%ENODEV will be
* returned.
*/
struct dentry *debugfs_create_file_size(const char *name, umode_t mode,
struct dentry *parent, void *data,
const struct file_operations *fops,
loff_t file_size)
{
struct dentry *de = debugfs_create_file(name, mode, parent, data, fops);
if (de)
de->d_inode->i_size = file_size;
return de;
}
EXPORT_SYMBOL_GPL(debugfs_create_file_size);
/**
* debugfs_create_dir - create a directory in the debugfs filesystem
* @name: a pointer to a string containing the name of the directory to
@ -416,11 +397,64 @@ EXPORT_SYMBOL_GPL(debugfs_create_file);
*/
struct dentry *debugfs_create_dir(const char *name, struct dentry *parent)
{
return __create_file(name, S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
parent, NULL, NULL);
struct dentry *dentry = start_creating(name, parent);
struct inode *inode;
if (IS_ERR(dentry))
return NULL;
inode = debugfs_get_inode(dentry->d_sb);
if (unlikely(!inode))
return failed_creating(dentry);
inode->i_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
inode->i_op = &simple_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
/* directory inodes start off with i_nlink == 2 (for "." entry) */
inc_nlink(inode);
d_instantiate(dentry, inode);
inc_nlink(dentry->d_parent->d_inode);
fsnotify_mkdir(dentry->d_parent->d_inode, dentry);
return end_creating(dentry);
}
EXPORT_SYMBOL_GPL(debugfs_create_dir);
/**
* debugfs_create_automount - create automount point in the debugfs filesystem
* @name: a pointer to a string containing the name of the file to create.
* @parent: a pointer to the parent dentry for this file. This should be a
* directory dentry if set. If this parameter is NULL, then the
* file will be created in the root of the debugfs filesystem.
* @f: function to be called when pathname resolution steps on that one.
* @data: opaque argument to pass to f().
*
* @f should return what ->d_automount() would.
*/
struct dentry *debugfs_create_automount(const char *name,
struct dentry *parent,
struct vfsmount *(*f)(void *),
void *data)
{
struct dentry *dentry = start_creating(name, parent);
struct inode *inode;
if (IS_ERR(dentry))
return NULL;
inode = debugfs_get_inode(dentry->d_sb);
if (unlikely(!inode))
return failed_creating(dentry);
inode->i_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
inode->i_flags |= S_AUTOMOUNT;
inode->i_private = data;
dentry->d_fsdata = (void *)f;
d_instantiate(dentry, inode);
return end_creating(dentry);
}
EXPORT_SYMBOL(debugfs_create_automount);
/**
* debugfs_create_symlink- create a symbolic link in the debugfs filesystem
* @name: a pointer to a string containing the name of the symbolic link to
@ -447,17 +481,28 @@ EXPORT_SYMBOL_GPL(debugfs_create_dir);
struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
const char *target)
{
struct dentry *result;
char *link;
link = kstrdup(target, GFP_KERNEL);
struct dentry *dentry;
struct inode *inode;
char *link = kstrdup(target, GFP_KERNEL);
if (!link)
return NULL;
result = __create_file(name, S_IFLNK | S_IRWXUGO, parent, link, NULL);
if (!result)
dentry = start_creating(name, parent);
if (IS_ERR(dentry)) {
kfree(link);
return result;
return NULL;
}
inode = debugfs_get_inode(dentry->d_sb);
if (unlikely(!inode)) {
kfree(link);
return failed_creating(dentry);
}
inode->i_mode = S_IFLNK | S_IRWXUGO;
inode->i_op = &debugfs_link_operations;
inode->i_private = link;
d_instantiate(dentry, inode);
return end_creating(dentry);
}
EXPORT_SYMBOL_GPL(debugfs_create_symlink);

18
include/linux/debugfs.h
View File

@ -51,11 +51,21 @@ struct dentry *debugfs_create_file(const char *name, umode_t mode,
struct dentry *parent, void *data,
const struct file_operations *fops);
struct dentry *debugfs_create_file_size(const char *name, umode_t mode,
struct dentry *parent, void *data,
const struct file_operations *fops,
loff_t file_size);
struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
const char *dest);
struct dentry *debugfs_create_automount(const char *name,
struct dentry *parent,
struct vfsmount *(*f)(void *),
void *data);
void debugfs_remove(struct dentry *dentry);
void debugfs_remove_recursive(struct dentry *dentry);
@ -124,6 +134,14 @@ static inline struct dentry *debugfs_create_file(const char *name, umode_t mode,
return ERR_PTR(-ENODEV);
}
static inline struct dentry *debugfs_create_file_size(const char *name, umode_t mode,
struct dentry *parent, void *data,
const struct file_operations *fops,
loff_t file_size)
{
return ERR_PTR(-ENODEV);
}
static inline struct dentry *debugfs_create_dir(const char *name,
struct dentry *parent)
{