Commit c9fe5630 authored by Linus Torvalds's avatar Linus Torvalds

Merge tag 'configfs-for-5.4' of git://git.infradead.org/users/hch/configfs

Pull configfs updates from Christoph Hellwig:

 - fix a symlink deadlock (Al Viro)

 - various cleanups (Al Viro, me)

* tag 'configfs-for-5.4' of git://git.infradead.org/users/hch/configfs:
  configfs: calculate the symlink target only once
  configfs: make configfs_create() return inode
  configfs: factor dirent removal into helpers
  configfs: fix a deadlock in configfs_symlink()
parents 7e3d2c82 e9c03af2
...@@ -34,7 +34,7 @@ struct configfs_dirent { ...@@ -34,7 +34,7 @@ struct configfs_dirent {
int s_dependent_count; int s_dependent_count;
struct list_head s_sibling; struct list_head s_sibling;
struct list_head s_children; struct list_head s_children;
struct list_head s_links; int s_links;
void * s_element; void * s_element;
int s_type; int s_type;
umode_t s_mode; umode_t s_mode;
...@@ -66,7 +66,7 @@ extern struct kmem_cache *configfs_dir_cachep; ...@@ -66,7 +66,7 @@ extern struct kmem_cache *configfs_dir_cachep;
extern int configfs_is_root(struct config_item *item); extern int configfs_is_root(struct config_item *item);
extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *); extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *);
extern int configfs_create(struct dentry *, umode_t mode, void (*init)(struct inode *)); extern struct inode *configfs_create(struct dentry *, umode_t mode);
extern int configfs_create_file(struct config_item *, const struct configfs_attribute *); extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
extern int configfs_create_bin_file(struct config_item *, extern int configfs_create_bin_file(struct config_item *,
...@@ -84,7 +84,6 @@ extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr); ...@@ -84,7 +84,6 @@ extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr);
extern struct dentry *configfs_pin_fs(void); extern struct dentry *configfs_pin_fs(void);
extern void configfs_release_fs(void); extern void configfs_release_fs(void);
extern struct rw_semaphore configfs_rename_sem;
extern const struct file_operations configfs_dir_operations; extern const struct file_operations configfs_dir_operations;
extern const struct file_operations configfs_file_operations; extern const struct file_operations configfs_file_operations;
extern const struct file_operations configfs_bin_file_operations; extern const struct file_operations configfs_bin_file_operations;
...@@ -97,14 +96,8 @@ extern int configfs_symlink(struct inode *dir, struct dentry *dentry, ...@@ -97,14 +96,8 @@ extern int configfs_symlink(struct inode *dir, struct dentry *dentry,
const char *symname); const char *symname);
extern int configfs_unlink(struct inode *dir, struct dentry *dentry); extern int configfs_unlink(struct inode *dir, struct dentry *dentry);
struct configfs_symlink { int configfs_create_link(struct configfs_dirent *target, struct dentry *parent,
struct list_head sl_list; struct dentry *dentry, char *body);
struct config_item *sl_target;
};
extern int configfs_create_link(struct configfs_symlink *sl,
struct dentry *parent,
struct dentry *dentry);
static inline struct config_item * to_item(struct dentry * dentry) static inline struct config_item * to_item(struct dentry * dentry)
{ {
...@@ -132,10 +125,6 @@ static inline struct config_item *configfs_get_config_item(struct dentry *dentry ...@@ -132,10 +125,6 @@ static inline struct config_item *configfs_get_config_item(struct dentry *dentry
spin_lock(&dentry->d_lock); spin_lock(&dentry->d_lock);
if (!d_unhashed(dentry)) { if (!d_unhashed(dentry)) {
struct configfs_dirent * sd = dentry->d_fsdata; struct configfs_dirent * sd = dentry->d_fsdata;
if (sd->s_type & CONFIGFS_ITEM_LINK) {
struct configfs_symlink * sl = sd->s_element;
item = config_item_get(sl->sl_target);
} else
item = config_item_get(sd->s_element); item = config_item_get(sd->s_element);
} }
spin_unlock(&dentry->d_lock); spin_unlock(&dentry->d_lock);
......
...@@ -22,7 +22,6 @@ ...@@ -22,7 +22,6 @@
#include <linux/configfs.h> #include <linux/configfs.h>
#include "configfs_internal.h" #include "configfs_internal.h"
DECLARE_RWSEM(configfs_rename_sem);
/* /*
* Protects mutations of configfs_dirent linkage together with proper i_mutex * Protects mutations of configfs_dirent linkage together with proper i_mutex
* Also protects mutations of symlinks linkage to target configfs_dirent * Also protects mutations of symlinks linkage to target configfs_dirent
...@@ -191,7 +190,6 @@ static struct configfs_dirent *configfs_new_dirent(struct configfs_dirent *paren ...@@ -191,7 +190,6 @@ static struct configfs_dirent *configfs_new_dirent(struct configfs_dirent *paren
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
atomic_set(&sd->s_count, 1); atomic_set(&sd->s_count, 1);
INIT_LIST_HEAD(&sd->s_links);
INIT_LIST_HEAD(&sd->s_children); INIT_LIST_HEAD(&sd->s_children);
sd->s_element = element; sd->s_element = element;
sd->s_type = type; sd->s_type = type;
...@@ -253,30 +251,16 @@ int configfs_make_dirent(struct configfs_dirent * parent_sd, ...@@ -253,30 +251,16 @@ int configfs_make_dirent(struct configfs_dirent * parent_sd,
return 0; return 0;
} }
static void init_dir(struct inode * inode) static void configfs_remove_dirent(struct dentry *dentry)
{ {
inode->i_op = &configfs_dir_inode_operations; struct configfs_dirent *sd = dentry->d_fsdata;
inode->i_fop = &configfs_dir_operations;
/* directory inodes start off with i_nlink == 2 (for "." entry) */
inc_nlink(inode);
}
static void configfs_init_file(struct inode * inode)
{
inode->i_size = PAGE_SIZE;
inode->i_fop = &configfs_file_operations;
}
static void configfs_init_bin_file(struct inode *inode)
{
inode->i_size = 0;
inode->i_fop = &configfs_bin_file_operations;
}
static void init_symlink(struct inode * inode) if (!sd)
{ return;
inode->i_op = &configfs_symlink_inode_operations; spin_lock(&configfs_dirent_lock);
list_del_init(&sd->s_sibling);
spin_unlock(&configfs_dirent_lock);
configfs_put(sd);
} }
/** /**
...@@ -294,6 +278,7 @@ static int configfs_create_dir(struct config_item *item, struct dentry *dentry, ...@@ -294,6 +278,7 @@ static int configfs_create_dir(struct config_item *item, struct dentry *dentry,
int error; int error;
umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO; umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO;
struct dentry *p = dentry->d_parent; struct dentry *p = dentry->d_parent;
struct inode *inode;
BUG_ON(!item); BUG_ON(!item);
...@@ -308,20 +293,24 @@ static int configfs_create_dir(struct config_item *item, struct dentry *dentry, ...@@ -308,20 +293,24 @@ static int configfs_create_dir(struct config_item *item, struct dentry *dentry,
return error; return error;
configfs_set_dir_dirent_depth(p->d_fsdata, dentry->d_fsdata); configfs_set_dir_dirent_depth(p->d_fsdata, dentry->d_fsdata);
error = configfs_create(dentry, mode, init_dir); inode = configfs_create(dentry, mode);
if (!error) { if (IS_ERR(inode))
goto out_remove;
inode->i_op = &configfs_dir_inode_operations;
inode->i_fop = &configfs_dir_operations;
/* directory inodes start off with i_nlink == 2 (for "." entry) */
inc_nlink(inode);
d_instantiate(dentry, inode);
/* already hashed */
dget(dentry); /* pin directory dentries in core */
inc_nlink(d_inode(p)); inc_nlink(d_inode(p));
item->ci_dentry = dentry; item->ci_dentry = dentry;
} else { return 0;
struct configfs_dirent *sd = dentry->d_fsdata;
if (sd) { out_remove:
spin_lock(&configfs_dirent_lock); configfs_remove_dirent(dentry);
list_del_init(&sd->s_sibling); return PTR_ERR(inode);
spin_unlock(&configfs_dirent_lock);
configfs_put(sd);
}
}
return error;
} }
/* /*
...@@ -362,41 +351,40 @@ int configfs_dirent_is_ready(struct configfs_dirent *sd) ...@@ -362,41 +351,40 @@ int configfs_dirent_is_ready(struct configfs_dirent *sd)
return ret; return ret;
} }
int configfs_create_link(struct configfs_symlink *sl, int configfs_create_link(struct configfs_dirent *target, struct dentry *parent,
struct dentry *parent, struct dentry *dentry, char *body)
struct dentry *dentry)
{ {
int err = 0; int err = 0;
umode_t mode = S_IFLNK | S_IRWXUGO; umode_t mode = S_IFLNK | S_IRWXUGO;
struct configfs_dirent *p = parent->d_fsdata; struct configfs_dirent *p = parent->d_fsdata;
struct inode *inode;
err = configfs_make_dirent(p, dentry, sl, mode, err = configfs_make_dirent(p, dentry, target, mode, CONFIGFS_ITEM_LINK,
CONFIGFS_ITEM_LINK, p->s_frag); p->s_frag);
if (!err) { if (err)
err = configfs_create(dentry, mode, init_symlink);
if (err) {
struct configfs_dirent *sd = dentry->d_fsdata;
if (sd) {
spin_lock(&configfs_dirent_lock);
list_del_init(&sd->s_sibling);
spin_unlock(&configfs_dirent_lock);
configfs_put(sd);
}
}
}
return err; return err;
inode = configfs_create(dentry, mode);
if (IS_ERR(inode))
goto out_remove;
inode->i_link = body;
inode->i_op = &configfs_symlink_inode_operations;
d_instantiate(dentry, inode);
dget(dentry); /* pin link dentries in core */
return 0;
out_remove:
configfs_remove_dirent(dentry);
return PTR_ERR(inode);
} }
static void remove_dir(struct dentry * d) static void remove_dir(struct dentry * d)
{ {
struct dentry * parent = dget(d->d_parent); struct dentry * parent = dget(d->d_parent);
struct configfs_dirent * sd;
sd = d->d_fsdata; configfs_remove_dirent(d);
spin_lock(&configfs_dirent_lock);
list_del_init(&sd->s_sibling);
spin_unlock(&configfs_dirent_lock);
configfs_put(sd);
if (d_really_is_positive(d)) if (d_really_is_positive(d))
simple_rmdir(d_inode(parent),d); simple_rmdir(d_inode(parent),d);
...@@ -437,20 +425,27 @@ static void configfs_remove_dir(struct config_item * item) ...@@ -437,20 +425,27 @@ static void configfs_remove_dir(struct config_item * item)
static int configfs_attach_attr(struct configfs_dirent * sd, struct dentry * dentry) static int configfs_attach_attr(struct configfs_dirent * sd, struct dentry * dentry)
{ {
struct configfs_attribute * attr = sd->s_element; struct configfs_attribute * attr = sd->s_element;
int error; struct inode *inode;
spin_lock(&configfs_dirent_lock); spin_lock(&configfs_dirent_lock);
dentry->d_fsdata = configfs_get(sd); dentry->d_fsdata = configfs_get(sd);
sd->s_dentry = dentry; sd->s_dentry = dentry;
spin_unlock(&configfs_dirent_lock); spin_unlock(&configfs_dirent_lock);
error = configfs_create(dentry, (attr->ca_mode & S_IALLUGO) | S_IFREG, inode = configfs_create(dentry, (attr->ca_mode & S_IALLUGO) | S_IFREG);
(sd->s_type & CONFIGFS_ITEM_BIN_ATTR) ? if (IS_ERR(inode)) {
configfs_init_bin_file :
configfs_init_file);
if (error)
configfs_put(sd); configfs_put(sd);
return error; return PTR_ERR(inode);
}
if (sd->s_type & CONFIGFS_ITEM_BIN_ATTR) {
inode->i_size = 0;
inode->i_fop = &configfs_bin_file_operations;
} else {
inode->i_size = PAGE_SIZE;
inode->i_fop = &configfs_file_operations;
}
d_add(dentry, inode);
return 0;
} }
static struct dentry * configfs_lookup(struct inode *dir, static struct dentry * configfs_lookup(struct inode *dir,
...@@ -520,7 +515,7 @@ static int configfs_detach_prep(struct dentry *dentry, struct dentry **wait) ...@@ -520,7 +515,7 @@ static int configfs_detach_prep(struct dentry *dentry, struct dentry **wait)
parent_sd->s_type |= CONFIGFS_USET_DROPPING; parent_sd->s_type |= CONFIGFS_USET_DROPPING;
ret = -EBUSY; ret = -EBUSY;
if (!list_empty(&parent_sd->s_links)) if (parent_sd->s_links)
goto out; goto out;
ret = 0; ret = 0;
...@@ -1578,44 +1573,6 @@ const struct inode_operations configfs_root_inode_operations = { ...@@ -1578,44 +1573,6 @@ const struct inode_operations configfs_root_inode_operations = {
.setattr = configfs_setattr, .setattr = configfs_setattr,
}; };
#if 0
int configfs_rename_dir(struct config_item * item, const char *new_name)
{
int error = 0;
struct dentry * new_dentry, * parent;
if (!strcmp(config_item_name(item), new_name))
return -EINVAL;
if (!item->parent)
return -EINVAL;
down_write(&configfs_rename_sem);
parent = item->parent->dentry;
inode_lock(d_inode(parent));
new_dentry = lookup_one_len(new_name, parent, strlen(new_name));
if (!IS_ERR(new_dentry)) {
if (d_really_is_negative(new_dentry)) {
error = config_item_set_name(item, "%s", new_name);
if (!error) {
d_add(new_dentry, NULL);
d_move(item->dentry, new_dentry);
}
else
d_delete(new_dentry);
} else
error = -EEXIST;
dput(new_dentry);
}
inode_unlock(d_inode(parent));
up_write(&configfs_rename_sem);
return error;
}
#endif
static int configfs_dir_open(struct inode *inode, struct file *file) static int configfs_dir_open(struct inode *inode, struct file *file)
{ {
struct dentry * dentry = file->f_path.dentry; struct dentry * dentry = file->f_path.dentry;
......
...@@ -164,41 +164,27 @@ static void configfs_set_inode_lock_class(struct configfs_dirent *sd, ...@@ -164,41 +164,27 @@ static void configfs_set_inode_lock_class(struct configfs_dirent *sd,
#endif /* CONFIG_LOCKDEP */ #endif /* CONFIG_LOCKDEP */
int configfs_create(struct dentry * dentry, umode_t mode, void (*init)(struct inode *)) struct inode *configfs_create(struct dentry *dentry, umode_t mode)
{ {
int error = 0;
struct inode *inode = NULL; struct inode *inode = NULL;
struct configfs_dirent *sd; struct configfs_dirent *sd;
struct inode *p_inode; struct inode *p_inode;
if (!dentry) if (!dentry)
return -ENOENT; return ERR_PTR(-ENOENT);
if (d_really_is_positive(dentry)) if (d_really_is_positive(dentry))
return -EEXIST; return ERR_PTR(-EEXIST);
sd = dentry->d_fsdata; sd = dentry->d_fsdata;
inode = configfs_new_inode(mode, sd, dentry->d_sb); inode = configfs_new_inode(mode, sd, dentry->d_sb);
if (!inode) if (!inode)
return -ENOMEM; return ERR_PTR(-ENOMEM);
p_inode = d_inode(dentry->d_parent); p_inode = d_inode(dentry->d_parent);
p_inode->i_mtime = p_inode->i_ctime = current_time(p_inode); p_inode->i_mtime = p_inode->i_ctime = current_time(p_inode);
configfs_set_inode_lock_class(sd, inode); configfs_set_inode_lock_class(sd, inode);
return inode;
init(inode);
if (S_ISDIR(mode) || S_ISLNK(mode)) {
/*
* ->symlink(), ->mkdir(), configfs_register_subsystem() or
* create_default_group() - already hashed.
*/
d_instantiate(dentry, inode);
dget(dentry); /* pin link and directory dentries in core */
} else {
/* ->lookup() */
d_add(dentry, inode);
}
return error;
} }
/* /*
......
...@@ -28,9 +28,18 @@ static struct vfsmount *configfs_mount = NULL; ...@@ -28,9 +28,18 @@ static struct vfsmount *configfs_mount = NULL;
struct kmem_cache *configfs_dir_cachep; struct kmem_cache *configfs_dir_cachep;
static int configfs_mnt_count = 0; static int configfs_mnt_count = 0;
static void configfs_free_inode(struct inode *inode)
{
if (S_ISLNK(inode->i_mode))
kfree(inode->i_link);
free_inode_nonrcu(inode);
}
static const struct super_operations configfs_ops = { static const struct super_operations configfs_ops = {
.statfs = simple_statfs, .statfs = simple_statfs,
.drop_inode = generic_delete_inode, .drop_inode = generic_delete_inode,
.free_inode = configfs_free_inode,
}; };
static struct config_group configfs_root_group = { static struct config_group configfs_root_group = {
......
...@@ -55,41 +55,63 @@ static void fill_item_path(struct config_item * item, char * buffer, int length) ...@@ -55,41 +55,63 @@ static void fill_item_path(struct config_item * item, char * buffer, int length)
} }
} }
static int configfs_get_target_path(struct config_item *item,
struct config_item *target, char *path)
{
int depth, size;
char *s;
depth = item_depth(item);
size = item_path_length(target) + depth * 3 - 1;
if (size > PATH_MAX)
return -ENAMETOOLONG;
pr_debug("%s: depth = %d, size = %d\n", __func__, depth, size);
for (s = path; depth--; s += 3)
strcpy(s,"../");
fill_item_path(target, path, size);
pr_debug("%s: path = '%s'\n", __func__, path);
return 0;
}
static int create_link(struct config_item *parent_item, static int create_link(struct config_item *parent_item,
struct config_item *item, struct config_item *item,
struct dentry *dentry) struct dentry *dentry)
{ {
struct configfs_dirent *target_sd = item->ci_dentry->d_fsdata; struct configfs_dirent *target_sd = item->ci_dentry->d_fsdata;
struct configfs_symlink *sl; char *body;
int ret; int ret;
ret = -ENOENT;
if (!configfs_dirent_is_ready(target_sd)) if (!configfs_dirent_is_ready(target_sd))
goto out; return -ENOENT;
ret = -ENOMEM;
sl = kmalloc(sizeof(struct configfs_symlink), GFP_KERNEL); body = kzalloc(PAGE_SIZE, GFP_KERNEL);
if (sl) { if (!body)
return -ENOMEM;
configfs_get(target_sd);
spin_lock(&configfs_dirent_lock); spin_lock(&configfs_dirent_lock);
if (target_sd->s_type & CONFIGFS_USET_DROPPING) { if (target_sd->s_type & CONFIGFS_USET_DROPPING) {
spin_unlock(&configfs_dirent_lock); spin_unlock(&configfs_dirent_lock);
kfree(sl); configfs_put(target_sd);
kfree(body);
return -ENOENT; return -ENOENT;
} }
sl->sl_target = config_item_get(item); target_sd->s_links++;
list_add(&sl->sl_list, &target_sd->s_links);
spin_unlock(&configfs_dirent_lock); spin_unlock(&configfs_dirent_lock);
ret = configfs_create_link(sl, parent_item->ci_dentry, ret = configfs_get_target_path(item, item, body);
dentry); if (!ret)
ret = configfs_create_link(target_sd, parent_item->ci_dentry,
dentry, body);
if (ret) { if (ret) {
spin_lock(&configfs_dirent_lock); spin_lock(&configfs_dirent_lock);
list_del_init(&sl->sl_list); target_sd->s_links--;
spin_unlock(&configfs_dirent_lock); spin_unlock(&configfs_dirent_lock);
config_item_put(item); configfs_put(target_sd);
kfree(sl); kfree(body);
}
} }
out:
return ret; return ret;
} }
...@@ -131,9 +153,8 @@ int configfs_symlink(struct inode *dir, struct dentry *dentry, const char *symna ...@@ -131,9 +153,8 @@ int configfs_symlink(struct inode *dir, struct dentry *dentry, const char *symna
* Fake invisibility if dir belongs to a group/default groups hierarchy * Fake invisibility if dir belongs to a group/default groups hierarchy
* being attached * being attached
*/ */
ret = -ENOENT;
if (!configfs_dirent_is_ready(sd)) if (!configfs_dirent_is_ready(sd))
goto out; return -ENOENT;
parent_item = configfs_get_config_item(dentry->d_parent); parent_item = configfs_get_config_item(dentry->d_parent);
type = parent_item->ci_type; type = parent_item->ci_type;
...@@ -143,10 +164,41 @@ int configfs_symlink(struct inode *dir, struct dentry *dentry, const char *symna ...@@ -143,10 +164,41 @@ int configfs_symlink(struct inode *dir, struct dentry *dentry, const char *symna
!type->ct_item_ops->allow_link) !type->ct_item_ops->allow_link)
goto out_put; goto out_put;
/*
* This is really sick. What they wanted was a hybrid of
* link(2) and symlink(2) - they wanted the target resolved
* at syscall time (as link(2) would've done), be a directory
* (which link(2) would've refused to do) *AND* be a deep
* fucking magic, making the target busy from rmdir POV.
* symlink(2) is nothing of that sort, and the locking it
* gets matches the normal symlink(2) semantics. Without
* attempts to resolve the target (which might very well
* not even exist yet) done prior to locking the parent
* directory. This perversion, OTOH, needs to resolve
* the target, which would lead to obvious deadlocks if
* attempted with any directories locked.
*
* Unfortunately, that garbage is userland ABI and we should've
* said "no" back in 2005. Too late now, so we get to
* play very ugly games with locking.
*
* Try *ANYTHING* of that sort in new code, and you will
* really regret it. Just ask yourself - what could a BOFH
* do to me and do I want to find it out first-hand?
*
* AV, a thoroughly annoyed bastard.
*/
inode_unlock(dir);
ret = get_target(symname, &path, &target_item, dentry->d_sb); ret = get_target(symname, &path, &target_item, dentry->d_sb);
inode_lock(dir);
if (ret) if (ret)
goto out_put; goto out_put;
if (dentry->d_inode || d_unhashed(dentry))
ret = -EEXIST;
else
ret = inode_permission(dir, MAY_WRITE | MAY_EXEC);
if (!ret)
ret = type->ct_item_ops->allow_link(parent_item, target_item); ret = type->ct_item_ops->allow_link(parent_item, target_item);
if (!ret) { if (!ret) {
mutex_lock(&configfs_symlink_mutex); mutex_lock(&configfs_symlink_mutex);
...@@ -162,15 +214,12 @@ int configfs_symlink(struct inode *dir, struct dentry *dentry, const char *symna ...@@ -162,15 +214,12 @@ int configfs_symlink(struct inode *dir, struct dentry *dentry, const char *symna
out_put: out_put:
config_item_put(parent_item); config_item_put(parent_item);
out:
return ret; return ret;
} }
int configfs_unlink(struct inode *dir, struct dentry *dentry) int configfs_unlink(struct inode *dir, struct dentry *dentry)
{ {
struct configfs_dirent *sd = dentry->d_fsdata; struct configfs_dirent *sd = dentry->d_fsdata, *target_sd;
struct configfs_symlink *sl;
struct config_item *parent_item; struct config_item *parent_item;
const struct config_item_type *type; const struct config_item_type *type;
int ret; int ret;
...@@ -179,7 +228,7 @@ int configfs_unlink(struct inode *dir, struct dentry *dentry) ...@@ -179,7 +228,7 @@ int configfs_unlink(struct inode *dir, struct dentry *dentry)
if (!(sd->s_type & CONFIGFS_ITEM_LINK)) if (!(sd->s_type & CONFIGFS_ITEM_LINK))
goto out; goto out;
sl = sd->s_element; target_sd = sd->s_element;
parent_item = configfs_get_config_item(dentry->d_parent); parent_item = configfs_get_config_item(dentry->d_parent);
type = parent_item->ci_type; type = parent_item->ci_type;
...@@ -193,21 +242,18 @@ int configfs_unlink(struct inode *dir, struct dentry *dentry) ...@@ -193,21 +242,18 @@ int configfs_unlink(struct inode *dir, struct dentry *dentry)
/* /*
* drop_link() must be called before * drop_link() must be called before
* list_del_init(&sl->sl_list), so that the order of * decrementing target's ->s_links, so that the order of
* drop_link(this, target) and drop_item(target) is preserved. * drop_link(this, target) and drop_item(target) is preserved.
*/ */
if (type && type->ct_item_ops && if (type && type->ct_item_ops &&
type->ct_item_ops->drop_link) type->ct_item_ops->drop_link)
type->ct_item_ops->drop_link(parent_item, type->ct_item_ops->drop_link(parent_item,
sl->sl_target); target_sd->s_element);
spin_lock(&configfs_dirent_lock); spin_lock(&configfs_dirent_lock);
list_del_init(&sl->sl_list); target_sd->s_links--;
spin_unlock(&configfs_dirent_lock); spin_unlock(&configfs_dirent_lock);
configfs_put(target_sd);
/* Put reference from create_link() */
config_item_put(sl->sl_target);
kfree(sl);
config_item_put(parent_item); config_item_put(parent_item);
...@@ -217,79 +263,8 @@ int configfs_unlink(struct inode *dir, struct dentry *dentry) ...@@ -217,79 +263,8 @@ int configfs_unlink(struct inode *dir, struct dentry *dentry)
return ret; return ret;
} }
static int configfs_get_target_path(struct config_item * item, struct config_item * target,
char *path)
{
char * s;
int depth, size;
depth = item_depth(item);
size = item_path_length(target) + depth * 3 - 1;
if (size > PATH_MAX)
return -ENAMETOOLONG;
pr_debug("%s: depth = %d, size = %d\n", __func__, depth, size);
for (s = path; depth--; s += 3)
strcpy(s,"../");
fill_item_path(target, path, size);
pr_debug("%s: path = '%s'\n", __func__, path);
return 0;
}
static int configfs_getlink(struct dentry *dentry, char * path)
{
struct config_item *item, *target_item;
int error = 0;
item = configfs_get_config_item(dentry->d_parent);
if (!item)
return -EINVAL;
target_item = configfs_get_config_item(dentry);
if (!target_item) {
config_item_put(item);
return -EINVAL;
}
down_read(&configfs_rename_sem);
error = configfs_get_target_path(item, target_item, path);
up_read(&configfs_rename_sem);
config_item_put(item);
config_item_put(target_item);
return error;
}
static const char *configfs_get_link(struct dentry *dentry,
struct inode *inode,
struct delayed_call *done)
{
char *body;
int error;
if (!dentry)
return ERR_PTR(-ECHILD);
body = kzalloc(PAGE_SIZE, GFP_KERNEL);
if (!body)
return ERR_PTR(-ENOMEM);
error = configfs_getlink(dentry, body);
if (!error) {
set_delayed_call(done, kfree_link, body);
return body;
}
kfree(body);
return ERR_PTR(error);
}
const struct inode_operations configfs_symlink_inode_operations = { const struct inode_operations configfs_symlink_inode_operations = {
.get_link = configfs_get_link, .get_link = simple_get_link,
.setattr = configfs_setattr, .setattr = configfs_setattr,
}; };
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