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Diffstat (limited to 'fs/configfs')
-rw-r--r--fs/configfs/configfs_internal.h14
-rw-r--r--fs/configfs/dir.c222
-rw-r--r--fs/configfs/file.c259
-rw-r--r--fs/configfs/inode.c6
-rw-r--r--fs/configfs/symlink.c22
5 files changed, 442 insertions, 81 deletions
diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h
index b65d1ef53..ccc31fa6f 100644
--- a/fs/configfs/configfs_internal.h
+++ b/fs/configfs/configfs_internal.h
@@ -53,13 +53,14 @@ struct configfs_dirent {
#define CONFIGFS_ROOT 0x0001
#define CONFIGFS_DIR 0x0002
#define CONFIGFS_ITEM_ATTR 0x0004
+#define CONFIGFS_ITEM_BIN_ATTR 0x0008
#define CONFIGFS_ITEM_LINK 0x0020
#define CONFIGFS_USET_DIR 0x0040
#define CONFIGFS_USET_DEFAULT 0x0080
#define CONFIGFS_USET_DROPPING 0x0100
#define CONFIGFS_USET_IN_MKDIR 0x0200
#define CONFIGFS_USET_CREATING 0x0400
-#define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR)
+#define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR | CONFIGFS_ITEM_BIN_ATTR)
extern struct mutex configfs_symlink_mutex;
extern spinlock_t configfs_dirent_lock;
@@ -72,6 +73,8 @@ extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *,
extern int configfs_create(struct dentry *, umode_t mode, void (*init)(struct inode *));
extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
+extern int configfs_create_bin_file(struct config_item *,
+ const struct configfs_bin_attribute *);
extern int configfs_make_dirent(struct configfs_dirent *,
struct dentry *, void *, umode_t, int);
extern int configfs_dirent_is_ready(struct configfs_dirent *);
@@ -88,7 +91,7 @@ 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_file_operations;
-extern const struct file_operations bin_fops;
+extern const struct file_operations configfs_bin_file_operations;
extern const struct inode_operations configfs_dir_inode_operations;
extern const struct inode_operations configfs_root_inode_operations;
extern const struct inode_operations configfs_symlink_inode_operations;
@@ -119,6 +122,13 @@ static inline struct configfs_attribute * to_attr(struct dentry * dentry)
return ((struct configfs_attribute *) sd->s_element);
}
+static inline struct configfs_bin_attribute *to_bin_attr(struct dentry *dentry)
+{
+ struct configfs_attribute *attr = to_attr(dentry);
+
+ return container_of(attr, struct configfs_bin_attribute, cb_attr);
+}
+
static inline struct config_item *configfs_get_config_item(struct dentry *dentry)
{
struct config_item * item = NULL;
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index a7a1b218f..f419519ec 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -255,6 +255,12 @@ static void configfs_init_file(struct inode * inode)
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)
{
inode->i_op = &configfs_symlink_inode_operations;
@@ -423,7 +429,9 @@ static int configfs_attach_attr(struct configfs_dirent * sd, struct dentry * den
spin_unlock(&configfs_dirent_lock);
error = configfs_create(dentry, (attr->ca_mode & S_IALLUGO) | S_IFREG,
- configfs_init_file);
+ (sd->s_type & CONFIGFS_ITEM_BIN_ATTR) ?
+ configfs_init_bin_file :
+ configfs_init_file);
if (error) {
configfs_put(sd);
return error;
@@ -583,6 +591,7 @@ static int populate_attrs(struct config_item *item)
{
struct config_item_type *t = item->ci_type;
struct configfs_attribute *attr;
+ struct configfs_bin_attribute *bin_attr;
int error = 0;
int i;
@@ -594,6 +603,13 @@ static int populate_attrs(struct config_item *item)
break;
}
}
+ if (t->ct_bin_attrs) {
+ for (i = 0; (bin_attr = t->ct_bin_attrs[i]) != NULL; i++) {
+ error = configfs_create_bin_file(item, bin_attr);
+ if (error)
+ break;
+ }
+ }
if (error)
detach_attrs(item);
@@ -624,13 +640,13 @@ static void detach_groups(struct config_group *group)
child = sd->s_dentry;
- mutex_lock(&d_inode(child)->i_mutex);
+ inode_lock(d_inode(child));
configfs_detach_group(sd->s_element);
d_inode(child)->i_flags |= S_DEAD;
dont_mount(child);
- mutex_unlock(&d_inode(child)->i_mutex);
+ inode_unlock(d_inode(child));
d_delete(child);
dput(child);
@@ -818,11 +834,11 @@ static int configfs_attach_item(struct config_item *parent_item,
* the VFS may already have hit and used them. Thus,
* we must lock them as rmdir() would.
*/
- mutex_lock(&d_inode(dentry)->i_mutex);
+ inode_lock(d_inode(dentry));
configfs_remove_dir(item);
d_inode(dentry)->i_flags |= S_DEAD;
dont_mount(dentry);
- mutex_unlock(&d_inode(dentry)->i_mutex);
+ inode_unlock(d_inode(dentry));
d_delete(dentry);
}
}
@@ -858,7 +874,7 @@ static int configfs_attach_group(struct config_item *parent_item,
* We must also lock the inode to remove it safely in case of
* error, as rmdir() would.
*/
- mutex_lock_nested(&d_inode(dentry)->i_mutex, I_MUTEX_CHILD);
+ inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD);
configfs_adjust_dir_dirent_depth_before_populate(sd);
ret = populate_groups(to_config_group(item));
if (ret) {
@@ -867,7 +883,7 @@ static int configfs_attach_group(struct config_item *parent_item,
dont_mount(dentry);
}
configfs_adjust_dir_dirent_depth_after_populate(sd);
- mutex_unlock(&d_inode(dentry)->i_mutex);
+ inode_unlock(d_inode(dentry));
if (ret)
d_delete(dentry);
}
@@ -1054,11 +1070,55 @@ out:
return ret;
}
+static int configfs_do_depend_item(struct dentry *subsys_dentry,
+ struct config_item *target)
+{
+ struct configfs_dirent *p;
+ int ret;
+
+ spin_lock(&configfs_dirent_lock);
+ /* Scan the tree, return 0 if found */
+ ret = configfs_depend_prep(subsys_dentry, target);
+ if (ret)
+ goto out_unlock_dirent_lock;
+
+ /*
+ * We are sure that the item is not about to be removed by rmdir(), and
+ * not in the middle of attachment by mkdir().
+ */
+ p = target->ci_dentry->d_fsdata;
+ p->s_dependent_count += 1;
+
+out_unlock_dirent_lock:
+ spin_unlock(&configfs_dirent_lock);
+
+ return ret;
+}
+
+static inline struct configfs_dirent *
+configfs_find_subsys_dentry(struct configfs_dirent *root_sd,
+ struct config_item *subsys_item)
+{
+ struct configfs_dirent *p;
+ struct configfs_dirent *ret = NULL;
+
+ list_for_each_entry(p, &root_sd->s_children, s_sibling) {
+ if (p->s_type & CONFIGFS_DIR &&
+ p->s_element == subsys_item) {
+ ret = p;
+ break;
+ }
+ }
+
+ return ret;
+}
+
+
int configfs_depend_item(struct configfs_subsystem *subsys,
struct config_item *target)
{
int ret;
- struct configfs_dirent *p, *root_sd, *subsys_sd = NULL;
+ struct configfs_dirent *subsys_sd;
struct config_item *s_item = &subsys->su_group.cg_item;
struct dentry *root;
@@ -1075,43 +1135,19 @@ int configfs_depend_item(struct configfs_subsystem *subsys,
* subsystem is really registered, and so we need to lock out
* configfs_[un]register_subsystem().
*/
- mutex_lock(&d_inode(root)->i_mutex);
-
- root_sd = root->d_fsdata;
-
- list_for_each_entry(p, &root_sd->s_children, s_sibling) {
- if (p->s_type & CONFIGFS_DIR) {
- if (p->s_element == s_item) {
- subsys_sd = p;
- break;
- }
- }
- }
+ inode_lock(d_inode(root));
+ subsys_sd = configfs_find_subsys_dentry(root->d_fsdata, s_item);
if (!subsys_sd) {
ret = -ENOENT;
goto out_unlock_fs;
}
/* Ok, now we can trust subsys/s_item */
+ ret = configfs_do_depend_item(subsys_sd->s_dentry, target);
- spin_lock(&configfs_dirent_lock);
- /* Scan the tree, return 0 if found */
- ret = configfs_depend_prep(subsys_sd->s_dentry, target);
- if (ret)
- goto out_unlock_dirent_lock;
-
- /*
- * We are sure that the item is not about to be removed by rmdir(), and
- * not in the middle of attachment by mkdir().
- */
- p = target->ci_dentry->d_fsdata;
- p->s_dependent_count += 1;
-
-out_unlock_dirent_lock:
- spin_unlock(&configfs_dirent_lock);
out_unlock_fs:
- mutex_unlock(&d_inode(root)->i_mutex);
+ inode_unlock(d_inode(root));
/*
* If we succeeded, the fs is pinned via other methods. If not,
@@ -1128,8 +1164,7 @@ EXPORT_SYMBOL(configfs_depend_item);
* configfs_depend_item() because we know that that the client driver is
* pinned, thus the subsystem is pinned, and therefore configfs is pinned.
*/
-void configfs_undepend_item(struct configfs_subsystem *subsys,
- struct config_item *target)
+void configfs_undepend_item(struct config_item *target)
{
struct configfs_dirent *sd;
@@ -1152,6 +1187,79 @@ void configfs_undepend_item(struct configfs_subsystem *subsys,
}
EXPORT_SYMBOL(configfs_undepend_item);
+/*
+ * caller_subsys is a caller's subsystem not target's. This is used to
+ * determine if we should lock root and check subsys or not. When we are
+ * in the same subsystem as our target there is no need to do locking as
+ * we know that subsys is valid and is not unregistered during this function
+ * as we are called from callback of one of his children and VFS holds a lock
+ * on some inode. Otherwise we have to lock our root to ensure that target's
+ * subsystem it is not unregistered during this function.
+ */
+int configfs_depend_item_unlocked(struct configfs_subsystem *caller_subsys,
+ struct config_item *target)
+{
+ struct configfs_subsystem *target_subsys;
+ struct config_group *root, *parent;
+ struct configfs_dirent *subsys_sd;
+ int ret = -ENOENT;
+
+ /* Disallow this function for configfs root */
+ if (configfs_is_root(target))
+ return -EINVAL;
+
+ parent = target->ci_group;
+ /*
+ * This may happen when someone is trying to depend root
+ * directory of some subsystem
+ */
+ if (configfs_is_root(&parent->cg_item)) {
+ target_subsys = to_configfs_subsystem(to_config_group(target));
+ root = parent;
+ } else {
+ target_subsys = parent->cg_subsys;
+ /* Find a cofnigfs root as we may need it for locking */
+ for (root = parent; !configfs_is_root(&root->cg_item);
+ root = root->cg_item.ci_group)
+ ;
+ }
+
+ if (target_subsys != caller_subsys) {
+ /*
+ * We are in other configfs subsystem, so we have to do
+ * additional locking to prevent other subsystem from being
+ * unregistered
+ */
+ inode_lock(d_inode(root->cg_item.ci_dentry));
+
+ /*
+ * As we are trying to depend item from other subsystem
+ * we have to check if this subsystem is still registered
+ */
+ subsys_sd = configfs_find_subsys_dentry(
+ root->cg_item.ci_dentry->d_fsdata,
+ &target_subsys->su_group.cg_item);
+ if (!subsys_sd)
+ goto out_root_unlock;
+ } else {
+ subsys_sd = target_subsys->su_group.cg_item.ci_dentry->d_fsdata;
+ }
+
+ /* Now we can execute core of depend item */
+ ret = configfs_do_depend_item(subsys_sd->s_dentry, target);
+
+ if (target_subsys != caller_subsys)
+out_root_unlock:
+ /*
+ * We were called from subsystem other than our target so we
+ * took some locks so now it's time to release them
+ */
+ inode_unlock(d_inode(root->cg_item.ci_dentry));
+
+ return ret;
+}
+EXPORT_SYMBOL(configfs_depend_item_unlocked);
+
static int configfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
int ret = 0;
@@ -1453,7 +1561,7 @@ int configfs_rename_dir(struct config_item * item, const char *new_name)
down_write(&configfs_rename_sem);
parent = item->parent->dentry;
- mutex_lock(&d_inode(parent)->i_mutex);
+ inode_lock(d_inode(parent));
new_dentry = lookup_one_len(new_name, parent, strlen(new_name));
if (!IS_ERR(new_dentry)) {
@@ -1469,7 +1577,7 @@ int configfs_rename_dir(struct config_item * item, const char *new_name)
error = -EEXIST;
dput(new_dentry);
}
- mutex_unlock(&d_inode(parent)->i_mutex);
+ inode_unlock(d_inode(parent));
up_write(&configfs_rename_sem);
return error;
@@ -1482,7 +1590,7 @@ static int configfs_dir_open(struct inode *inode, struct file *file)
struct configfs_dirent * parent_sd = dentry->d_fsdata;
int err;
- mutex_lock(&d_inode(dentry)->i_mutex);
+ inode_lock(d_inode(dentry));
/*
* Fake invisibility if dir belongs to a group/default groups hierarchy
* being attached
@@ -1495,7 +1603,7 @@ static int configfs_dir_open(struct inode *inode, struct file *file)
else
err = 0;
}
- mutex_unlock(&d_inode(dentry)->i_mutex);
+ inode_unlock(d_inode(dentry));
return err;
}
@@ -1505,11 +1613,11 @@ static int configfs_dir_close(struct inode *inode, struct file *file)
struct dentry * dentry = file->f_path.dentry;
struct configfs_dirent * cursor = file->private_data;
- mutex_lock(&d_inode(dentry)->i_mutex);
+ inode_lock(d_inode(dentry));
spin_lock(&configfs_dirent_lock);
list_del_init(&cursor->s_sibling);
spin_unlock(&configfs_dirent_lock);
- mutex_unlock(&d_inode(dentry)->i_mutex);
+ inode_unlock(d_inode(dentry));
release_configfs_dirent(cursor);
@@ -1590,7 +1698,7 @@ static loff_t configfs_dir_lseek(struct file *file, loff_t offset, int whence)
{
struct dentry * dentry = file->f_path.dentry;
- mutex_lock(&d_inode(dentry)->i_mutex);
+ inode_lock(d_inode(dentry));
switch (whence) {
case 1:
offset += file->f_pos;
@@ -1598,7 +1706,7 @@ static loff_t configfs_dir_lseek(struct file *file, loff_t offset, int whence)
if (offset >= 0)
break;
default:
- mutex_unlock(&d_inode(dentry)->i_mutex);
+ inode_unlock(d_inode(dentry));
return -EINVAL;
}
if (offset != file->f_pos) {
@@ -1624,7 +1732,7 @@ static loff_t configfs_dir_lseek(struct file *file, loff_t offset, int whence)
spin_unlock(&configfs_dirent_lock);
}
}
- mutex_unlock(&d_inode(dentry)->i_mutex);
+ inode_unlock(d_inode(dentry));
return offset;
}
@@ -1659,14 +1767,14 @@ int configfs_register_group(struct config_group *parent_group,
parent = parent_group->cg_item.ci_dentry;
- mutex_lock_nested(&d_inode(parent)->i_mutex, I_MUTEX_PARENT);
+ inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
ret = create_default_group(parent_group, group);
if (!ret) {
spin_lock(&configfs_dirent_lock);
configfs_dir_set_ready(group->cg_item.ci_dentry->d_fsdata);
spin_unlock(&configfs_dirent_lock);
}
- mutex_unlock(&d_inode(parent)->i_mutex);
+ inode_unlock(d_inode(parent));
return ret;
}
EXPORT_SYMBOL(configfs_register_group);
@@ -1683,7 +1791,7 @@ void configfs_unregister_group(struct config_group *group)
struct dentry *dentry = group->cg_item.ci_dentry;
struct dentry *parent = group->cg_item.ci_parent->ci_dentry;
- mutex_lock_nested(&d_inode(parent)->i_mutex, I_MUTEX_PARENT);
+ inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
spin_lock(&configfs_dirent_lock);
configfs_detach_prep(dentry, NULL);
spin_unlock(&configfs_dirent_lock);
@@ -1692,7 +1800,7 @@ void configfs_unregister_group(struct config_group *group)
d_inode(dentry)->i_flags |= S_DEAD;
dont_mount(dentry);
d_delete(dentry);
- mutex_unlock(&d_inode(parent)->i_mutex);
+ inode_unlock(d_inode(parent));
dput(dentry);
@@ -1764,7 +1872,7 @@ int configfs_register_subsystem(struct configfs_subsystem *subsys)
sd = root->d_fsdata;
link_group(to_config_group(sd->s_element), group);
- mutex_lock_nested(&d_inode(root)->i_mutex, I_MUTEX_PARENT);
+ inode_lock_nested(d_inode(root), I_MUTEX_PARENT);
err = -ENOMEM;
dentry = d_alloc_name(root, group->cg_item.ci_name);
@@ -1784,7 +1892,7 @@ int configfs_register_subsystem(struct configfs_subsystem *subsys)
}
}
- mutex_unlock(&d_inode(root)->i_mutex);
+ inode_unlock(d_inode(root));
if (err) {
unlink_group(group);
@@ -1805,9 +1913,9 @@ void configfs_unregister_subsystem(struct configfs_subsystem *subsys)
return;
}
- mutex_lock_nested(&d_inode(root)->i_mutex,
+ inode_lock_nested(d_inode(root),
I_MUTEX_PARENT);
- mutex_lock_nested(&d_inode(dentry)->i_mutex, I_MUTEX_CHILD);
+ inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD);
mutex_lock(&configfs_symlink_mutex);
spin_lock(&configfs_dirent_lock);
if (configfs_detach_prep(dentry, NULL)) {
@@ -1818,11 +1926,11 @@ void configfs_unregister_subsystem(struct configfs_subsystem *subsys)
configfs_detach_group(&group->cg_item);
d_inode(dentry)->i_flags |= S_DEAD;
dont_mount(dentry);
- mutex_unlock(&d_inode(dentry)->i_mutex);
+ inode_unlock(d_inode(dentry));
d_delete(dentry);
- mutex_unlock(&d_inode(root)->i_mutex);
+ inode_unlock(d_inode(root));
dput(dentry);
diff --git a/fs/configfs/file.c b/fs/configfs/file.c
index d39099ea7..33b7ee34e 100644
--- a/fs/configfs/file.c
+++ b/fs/configfs/file.c
@@ -28,6 +28,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/mutex.h>
+#include <linux/vmalloc.h>
#include <asm/uaccess.h>
#include <linux/configfs.h>
@@ -48,6 +49,10 @@ struct configfs_buffer {
struct configfs_item_operations * ops;
struct mutex mutex;
int needs_read_fill;
+ bool read_in_progress;
+ bool write_in_progress;
+ char *bin_buffer;
+ int bin_buffer_size;
};
@@ -123,6 +128,87 @@ out:
return retval;
}
+/**
+ * configfs_read_bin_file - read a binary attribute.
+ * @file: file pointer.
+ * @buf: buffer to fill.
+ * @count: number of bytes to read.
+ * @ppos: starting offset in file.
+ *
+ * Userspace wants to read a binary attribute file. The attribute
+ * descriptor is in the file's ->d_fsdata. The target item is in the
+ * directory's ->d_fsdata.
+ *
+ * We check whether we need to refill the buffer. If so we will
+ * call the attributes' attr->read() twice. The first time we
+ * will pass a NULL as a buffer pointer, which the attributes' method
+ * will use to return the size of the buffer required. If no error
+ * occurs we will allocate the buffer using vmalloc and call
+ * attr->read() again passing that buffer as an argument.
+ * Then we just copy to user-space using simple_read_from_buffer.
+ */
+
+static ssize_t
+configfs_read_bin_file(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct configfs_buffer *buffer = file->private_data;
+ struct dentry *dentry = file->f_path.dentry;
+ struct config_item *item = to_item(dentry->d_parent);
+ struct configfs_bin_attribute *bin_attr = to_bin_attr(dentry);
+ ssize_t retval = 0;
+ ssize_t len = min_t(size_t, count, PAGE_SIZE);
+
+ mutex_lock(&buffer->mutex);
+
+ /* we don't support switching read/write modes */
+ if (buffer->write_in_progress) {
+ retval = -ETXTBSY;
+ goto out;
+ }
+ buffer->read_in_progress = 1;
+
+ if (buffer->needs_read_fill) {
+ /* perform first read with buf == NULL to get extent */
+ len = bin_attr->read(item, NULL, 0);
+ if (len <= 0) {
+ retval = len;
+ goto out;
+ }
+
+ /* do not exceed the maximum value */
+ if (bin_attr->cb_max_size && len > bin_attr->cb_max_size) {
+ retval = -EFBIG;
+ goto out;
+ }
+
+ buffer->bin_buffer = vmalloc(len);
+ if (buffer->bin_buffer == NULL) {
+ retval = -ENOMEM;
+ goto out;
+ }
+ buffer->bin_buffer_size = len;
+
+ /* perform second read to fill buffer */
+ len = bin_attr->read(item, buffer->bin_buffer, len);
+ if (len < 0) {
+ retval = len;
+ vfree(buffer->bin_buffer);
+ buffer->bin_buffer_size = 0;
+ buffer->bin_buffer = NULL;
+ goto out;
+ }
+
+ buffer->needs_read_fill = 0;
+ }
+
+ retval = simple_read_from_buffer(buf, count, ppos, buffer->bin_buffer,
+ buffer->bin_buffer_size);
+out:
+ mutex_unlock(&buffer->mutex);
+ return retval;
+}
+
/**
* fill_write_buffer - copy buffer from userspace.
@@ -209,10 +295,80 @@ configfs_write_file(struct file *file, const char __user *buf, size_t count, lof
return len;
}
-static int check_perm(struct inode * inode, struct file * file)
+/**
+ * configfs_write_bin_file - write a binary attribute.
+ * @file: file pointer
+ * @buf: data to write
+ * @count: number of bytes
+ * @ppos: starting offset
+ *
+ * Writing to a binary attribute file is similar to a normal read.
+ * We buffer the consecutive writes (binary attribute files do not
+ * support lseek) in a continuously growing buffer, but we don't
+ * commit until the close of the file.
+ */
+
+static ssize_t
+configfs_write_bin_file(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct configfs_buffer *buffer = file->private_data;
+ struct dentry *dentry = file->f_path.dentry;
+ struct configfs_bin_attribute *bin_attr = to_bin_attr(dentry);
+ void *tbuf = NULL;
+ ssize_t len;
+
+ mutex_lock(&buffer->mutex);
+
+ /* we don't support switching read/write modes */
+ if (buffer->read_in_progress) {
+ len = -ETXTBSY;
+ goto out;
+ }
+ buffer->write_in_progress = 1;
+
+ /* buffer grows? */
+ if (*ppos + count > buffer->bin_buffer_size) {
+
+ if (bin_attr->cb_max_size &&
+ *ppos + count > bin_attr->cb_max_size) {
+ len = -EFBIG;
+ }
+
+ tbuf = vmalloc(*ppos + count);
+ if (tbuf == NULL) {
+ len = -ENOMEM;
+ goto out;
+ }
+
+ /* copy old contents */
+ if (buffer->bin_buffer) {
+ memcpy(tbuf, buffer->bin_buffer,
+ buffer->bin_buffer_size);
+ vfree(buffer->bin_buffer);
+ }
+
+ /* clear the new area */
+ memset(tbuf + buffer->bin_buffer_size, 0,
+ *ppos + count - buffer->bin_buffer_size);
+ buffer->bin_buffer = tbuf;
+ buffer->bin_buffer_size = *ppos + count;
+ }
+
+ len = simple_write_to_buffer(buffer->bin_buffer,
+ buffer->bin_buffer_size, ppos, buf, count);
+ if (len > 0)
+ *ppos += len;
+out:
+ mutex_unlock(&buffer->mutex);
+ return len;
+}
+
+static int check_perm(struct inode * inode, struct file * file, int type)
{
struct config_item *item = configfs_get_config_item(file->f_path.dentry->d_parent);
struct configfs_attribute * attr = to_attr(file->f_path.dentry);
+ struct configfs_bin_attribute *bin_attr = NULL;
struct configfs_buffer * buffer;
struct configfs_item_operations * ops = NULL;
int error = 0;
@@ -220,6 +376,9 @@ static int check_perm(struct inode * inode, struct file * file)
if (!item || !attr)
goto Einval;
+ if (type & CONFIGFS_ITEM_BIN_ATTR)
+ bin_attr = to_bin_attr(file->f_path.dentry);
+
/* Grab the module reference for this attribute if we have one */
if (!try_module_get(attr->ca_owner)) {
error = -ENODEV;
@@ -236,9 +395,14 @@ static int check_perm(struct inode * inode, struct file * file)
* and we must have a store method.
*/
if (file->f_mode & FMODE_WRITE) {
- if (!(inode->i_mode & S_IWUGO) || !attr->store)
+ if (!(inode->i_mode & S_IWUGO))
+ goto Eaccess;
+
+ if ((type & CONFIGFS_ITEM_ATTR) && !attr->store)
goto Eaccess;
+ if ((type & CONFIGFS_ITEM_BIN_ATTR) && !bin_attr->write)
+ goto Eaccess;
}
/* File needs read support.
@@ -246,7 +410,13 @@ static int check_perm(struct inode * inode, struct file * file)
* must be a show method for it.
*/
if (file->f_mode & FMODE_READ) {
- if (!(inode->i_mode & S_IRUGO) || !attr->show)
+ if (!(inode->i_mode & S_IRUGO))
+ goto Eaccess;
+
+ if ((type & CONFIGFS_ITEM_ATTR) && !attr->show)
+ goto Eaccess;
+
+ if ((type & CONFIGFS_ITEM_BIN_ATTR) && !bin_attr->read)
goto Eaccess;
}
@@ -260,6 +430,8 @@ static int check_perm(struct inode * inode, struct file * file)
}
mutex_init(&buffer->mutex);
buffer->needs_read_fill = 1;
+ buffer->read_in_progress = 0;
+ buffer->write_in_progress = 0;
buffer->ops = ops;
file->private_data = buffer;
goto Done;
@@ -277,12 +449,7 @@ static int check_perm(struct inode * inode, struct file * file)
return error;
}
-static int configfs_open_file(struct inode * inode, struct file * filp)
-{
- return check_perm(inode,filp);
-}
-
-static int configfs_release(struct inode * inode, struct file * filp)
+static int configfs_release(struct inode *inode, struct file *filp)
{
struct config_item * item = to_item(filp->f_path.dentry->d_parent);
struct configfs_attribute * attr = to_attr(filp->f_path.dentry);
@@ -303,6 +470,47 @@ static int configfs_release(struct inode * inode, struct file * filp)
return 0;
}
+static int configfs_open_file(struct inode *inode, struct file *filp)
+{
+ return check_perm(inode, filp, CONFIGFS_ITEM_ATTR);
+}
+
+static int configfs_open_bin_file(struct inode *inode, struct file *filp)
+{
+ return check_perm(inode, filp, CONFIGFS_ITEM_BIN_ATTR);
+}
+
+static int configfs_release_bin_file(struct inode *inode, struct file *filp)
+{
+ struct configfs_buffer *buffer = filp->private_data;
+ struct dentry *dentry = filp->f_path.dentry;
+ struct config_item *item = to_item(dentry->d_parent);
+ struct configfs_bin_attribute *bin_attr = to_bin_attr(dentry);
+ ssize_t len = 0;
+ int ret;
+
+ buffer->read_in_progress = 0;
+
+ if (buffer->write_in_progress) {
+ buffer->write_in_progress = 0;
+
+ len = bin_attr->write(item, buffer->bin_buffer,
+ buffer->bin_buffer_size);
+
+ /* vfree on NULL is safe */
+ vfree(buffer->bin_buffer);
+ buffer->bin_buffer = NULL;
+ buffer->bin_buffer_size = 0;
+ buffer->needs_read_fill = 1;
+ }
+
+ ret = configfs_release(inode, filp);
+ if (len < 0)
+ return len;
+ return ret;
+}
+
+
const struct file_operations configfs_file_operations = {
.read = configfs_read_file,
.write = configfs_write_file,
@@ -311,6 +519,14 @@ const struct file_operations configfs_file_operations = {
.release = configfs_release,
};
+const struct file_operations configfs_bin_file_operations = {
+ .read = configfs_read_bin_file,
+ .write = configfs_write_bin_file,
+ .llseek = NULL, /* bin file is not seekable */
+ .open = configfs_open_bin_file,
+ .release = configfs_release_bin_file,
+};
+
/**
* configfs_create_file - create an attribute file for an item.
* @item: item we're creating for.
@@ -324,11 +540,32 @@ int configfs_create_file(struct config_item * item, const struct configfs_attrib
umode_t mode = (attr->ca_mode & S_IALLUGO) | S_IFREG;
int error = 0;
- mutex_lock_nested(&d_inode(dir)->i_mutex, I_MUTEX_NORMAL);
+ inode_lock_nested(d_inode(dir), I_MUTEX_NORMAL);
error = configfs_make_dirent(parent_sd, NULL, (void *) attr, mode,
CONFIGFS_ITEM_ATTR);
- mutex_unlock(&d_inode(dir)->i_mutex);
+ inode_unlock(d_inode(dir));
return error;
}
+/**
+ * configfs_create_bin_file - create a binary attribute file for an item.
+ * @item: item we're creating for.
+ * @attr: atrribute descriptor.
+ */
+
+int configfs_create_bin_file(struct config_item *item,
+ const struct configfs_bin_attribute *bin_attr)
+{
+ struct dentry *dir = item->ci_dentry;
+ struct configfs_dirent *parent_sd = dir->d_fsdata;
+ umode_t mode = (bin_attr->cb_attr.ca_mode & S_IALLUGO) | S_IFREG;
+ int error = 0;
+
+ inode_lock_nested(dir->d_inode, I_MUTEX_NORMAL);
+ error = configfs_make_dirent(parent_sd, NULL, (void *) bin_attr, mode,
+ CONFIGFS_ITEM_BIN_ATTR);
+ inode_unlock(dir->d_inode);
+
+ return error;
+}
diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c
index eae87575e..cee087d8f 100644
--- a/fs/configfs/inode.c
+++ b/fs/configfs/inode.c
@@ -218,7 +218,7 @@ const unsigned char * configfs_get_name(struct configfs_dirent *sd)
if (sd->s_type & (CONFIGFS_DIR | CONFIGFS_ITEM_LINK))
return sd->s_dentry->d_name.name;
- if (sd->s_type & CONFIGFS_ITEM_ATTR) {
+ if (sd->s_type & (CONFIGFS_ITEM_ATTR | CONFIGFS_ITEM_BIN_ATTR)) {
attr = sd->s_element;
return attr->ca_name;
}
@@ -255,7 +255,7 @@ void configfs_hash_and_remove(struct dentry * dir, const char * name)
/* no inode means this hasn't been made visible yet */
return;
- mutex_lock(&d_inode(dir)->i_mutex);
+ inode_lock(d_inode(dir));
list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
if (!sd->s_element)
continue;
@@ -268,5 +268,5 @@ void configfs_hash_and_remove(struct dentry * dir, const char * name)
break;
}
}
- mutex_unlock(&d_inode(dir)->i_mutex);
+ inode_unlock(d_inode(dir));
}
diff --git a/fs/configfs/symlink.c b/fs/configfs/symlink.c
index ec5c8325b..db6d69289 100644
--- a/fs/configfs/symlink.c
+++ b/fs/configfs/symlink.c
@@ -279,27 +279,33 @@ static int configfs_getlink(struct dentry *dentry, char * path)
}
-static const char *configfs_follow_link(struct dentry *dentry, void **cookie)
+static const char *configfs_get_link(struct dentry *dentry,
+ struct inode *inode,
+ struct delayed_call *done)
{
- unsigned long page = get_zeroed_page(GFP_KERNEL);
+ char *body;
int error;
- if (!page)
+ if (!dentry)
+ return ERR_PTR(-ECHILD);
+
+ body = kzalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!body)
return ERR_PTR(-ENOMEM);
- error = configfs_getlink(dentry, (char *)page);
+ error = configfs_getlink(dentry, body);
if (!error) {
- return *cookie = (void *)page;
+ set_delayed_call(done, kfree_link, body);
+ return body;
}
- free_page(page);
+ kfree(body);
return ERR_PTR(error);
}
const struct inode_operations configfs_symlink_inode_operations = {
- .follow_link = configfs_follow_link,
+ .get_link = configfs_get_link,
.readlink = generic_readlink,
- .put_link = free_page_put_link,
.setattr = configfs_setattr,
};
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-15 23:19:15 +0000