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Diffstat (limited to 'fs/sysfs')
-rw-r--r--fs/sysfs/dir.c10
-rw-r--r--fs/sysfs/file.c78
-rw-r--r--fs/sysfs/group.c26
-rw-r--r--fs/sysfs/symlink.c88
4 files changed, 85 insertions, 117 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 337162935d2..4948d9bc405 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -440,7 +440,7 @@ int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
/**
* sysfs_remove_one - remove sysfs_dirent from parent
* @acxt: addrm context to use
- * @sd: sysfs_dirent to be added
+ * @sd: sysfs_dirent to be removed
*
* Mark @sd removed and drop nlink of parent inode if @sd is a
* directory. @sd is unlinked from the children list.
@@ -678,8 +678,10 @@ static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry,
sd = sysfs_find_dirent(parent_sd, dentry->d_name.name);
/* no such entry */
- if (!sd)
+ if (!sd) {
+ ret = ERR_PTR(-ENOENT);
goto out_unlock;
+ }
/* attach dentry and inode */
inode = sysfs_get_inode(sd);
@@ -781,6 +783,7 @@ int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
old_dentry = sysfs_get_dentry(sd);
if (IS_ERR(old_dentry)) {
error = PTR_ERR(old_dentry);
+ old_dentry = NULL;
goto out;
}
@@ -848,6 +851,7 @@ int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj)
old_dentry = sysfs_get_dentry(sd);
if (IS_ERR(old_dentry)) {
error = PTR_ERR(old_dentry);
+ old_dentry = NULL;
goto out;
}
old_parent = old_dentry->d_parent;
@@ -855,6 +859,7 @@ int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj)
new_parent = sysfs_get_dentry(new_parent_sd);
if (IS_ERR(new_parent)) {
error = PTR_ERR(new_parent);
+ new_parent = NULL;
goto out;
}
@@ -878,7 +883,6 @@ again:
error = 0;
d_add(new_dentry, NULL);
d_move(old_dentry, new_dentry);
- dput(new_dentry);
/* Remove from old parent's list and insert into new parent's list. */
sysfs_unlink_sibling(sd);
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 4045bdcc4b3..a271c87c447 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -20,43 +20,6 @@
#include "sysfs.h"
-#define to_sattr(a) container_of(a,struct subsys_attribute, attr)
-
-/*
- * Subsystem file operations.
- * These operations allow subsystems to have files that can be
- * read/written.
- */
-static ssize_t
-subsys_attr_show(struct kobject * kobj, struct attribute * attr, char * page)
-{
- struct kset *kset = to_kset(kobj);
- struct subsys_attribute * sattr = to_sattr(attr);
- ssize_t ret = -EIO;
-
- if (sattr->show)
- ret = sattr->show(kset, page);
- return ret;
-}
-
-static ssize_t
-subsys_attr_store(struct kobject * kobj, struct attribute * attr,
- const char * page, size_t count)
-{
- struct kset *kset = to_kset(kobj);
- struct subsys_attribute * sattr = to_sattr(attr);
- ssize_t ret = -EIO;
-
- if (sattr->store)
- ret = sattr->store(kset, page, count);
- return ret;
-}
-
-static struct sysfs_ops subsys_sysfs_ops = {
- .show = subsys_attr_show,
- .store = subsys_attr_store,
-};
-
/*
* There's one sysfs_buffer for each open file and one
* sysfs_open_dirent for each sysfs_dirent with one or more open
@@ -66,7 +29,7 @@ static struct sysfs_ops subsys_sysfs_ops = {
* sysfs_dirent->s_attr.open points to sysfs_open_dirent. s_attr.open
* is protected by sysfs_open_dirent_lock.
*/
-static spinlock_t sysfs_open_dirent_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(sysfs_open_dirent_lock);
struct sysfs_open_dirent {
atomic_t refcnt;
@@ -354,31 +317,23 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
{
struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
struct kobject *kobj = attr_sd->s_parent->s_dir.kobj;
- struct sysfs_buffer * buffer;
- struct sysfs_ops * ops = NULL;
- int error;
+ struct sysfs_buffer *buffer;
+ struct sysfs_ops *ops;
+ int error = -EACCES;
/* need attr_sd for attr and ops, its parent for kobj */
if (!sysfs_get_active_two(attr_sd))
return -ENODEV;
- /* if the kobject has no ktype, then we assume that it is a subsystem
- * itself, and use ops for it.
- */
- if (kobj->kset && kobj->kset->ktype)
- ops = kobj->kset->ktype->sysfs_ops;
- else if (kobj->ktype)
+ /* every kobject with an attribute needs a ktype assigned */
+ if (kobj->ktype && kobj->ktype->sysfs_ops)
ops = kobj->ktype->sysfs_ops;
- else
- ops = &subsys_sysfs_ops;
-
- error = -EACCES;
-
- /* No sysfs operations, either from having no subsystem,
- * or the subsystem have no operations.
- */
- if (!ops)
+ else {
+ printk(KERN_ERR "missing sysfs attribute operations for "
+ "kobject: %s\n", kobject_name(kobj));
+ WARN_ON(1);
goto err_out;
+ }
/* File needs write support.
* The inode's perms must say it's ok,
@@ -568,7 +523,11 @@ int sysfs_add_file_to_group(struct kobject *kobj,
struct sysfs_dirent *dir_sd;
int error;
- dir_sd = sysfs_get_dirent(kobj->sd, group);
+ if (group)
+ dir_sd = sysfs_get_dirent(kobj->sd, group);
+ else
+ dir_sd = sysfs_get(kobj->sd);
+
if (!dir_sd)
return -ENOENT;
@@ -656,7 +615,10 @@ void sysfs_remove_file_from_group(struct kobject *kobj,
{
struct sysfs_dirent *dir_sd;
- dir_sd = sysfs_get_dirent(kobj->sd, group);
+ if (group)
+ dir_sd = sysfs_get_dirent(kobj->sd, group);
+ else
+ dir_sd = sysfs_get(kobj->sd);
if (dir_sd) {
sysfs_hash_and_remove(dir_sd, attr->name);
sysfs_put(dir_sd);
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c
index d1972374655..0871c3dadce 100644
--- a/fs/sysfs/group.c
+++ b/fs/sysfs/group.c
@@ -16,25 +16,31 @@
#include "sysfs.h"
-static void remove_files(struct sysfs_dirent *dir_sd,
+static void remove_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
const struct attribute_group *grp)
{
struct attribute *const* attr;
+ int i;
- for (attr = grp->attrs; *attr; attr++)
- sysfs_hash_and_remove(dir_sd, (*attr)->name);
+ for (i = 0, attr = grp->attrs; *attr; i++, attr++)
+ if (!grp->is_visible ||
+ grp->is_visible(kobj, *attr, i))
+ sysfs_hash_and_remove(dir_sd, (*attr)->name);
}
-static int create_files(struct sysfs_dirent *dir_sd,
+static int create_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
const struct attribute_group *grp)
{
struct attribute *const* attr;
- int error = 0;
+ int error = 0, i;
- for (attr = grp->attrs; *attr && !error; attr++)
- error = sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR);
+ for (i = 0, attr = grp->attrs; *attr && !error; i++, attr++)
+ if (!grp->is_visible ||
+ grp->is_visible(kobj, *attr, i))
+ error |=
+ sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR);
if (error)
- remove_files(dir_sd, grp);
+ remove_files(dir_sd, kobj, grp);
return error;
}
@@ -54,7 +60,7 @@ int sysfs_create_group(struct kobject * kobj,
} else
sd = kobj->sd;
sysfs_get(sd);
- error = create_files(sd, grp);
+ error = create_files(sd, kobj, grp);
if (error) {
if (grp->name)
sysfs_remove_subdir(sd);
@@ -75,7 +81,7 @@ void sysfs_remove_group(struct kobject * kobj,
} else
sd = sysfs_get(dir_sd);
- remove_files(sd, grp);
+ remove_files(sd, kobj, grp);
if (grp->name)
sysfs_remove_subdir(sd);
diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index 3eac20c63c4..5f66c446615 100644
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -19,39 +19,6 @@
#include "sysfs.h"
-static int object_depth(struct sysfs_dirent *sd)
-{
- int depth = 0;
-
- for (; sd->s_parent; sd = sd->s_parent)
- depth++;
-
- return depth;
-}
-
-static int object_path_length(struct sysfs_dirent * sd)
-{
- int length = 1;
-
- for (; sd->s_parent; sd = sd->s_parent)
- length += strlen(sd->s_name) + 1;
-
- return length;
-}
-
-static void fill_object_path(struct sysfs_dirent *sd, char *buffer, int length)
-{
- --length;
- for (; sd->s_parent; sd = sd->s_parent) {
- int cur = strlen(sd->s_name);
-
- /* back up enough to print this bus id with '/' */
- length -= cur;
- strncpy(buffer + length, sd->s_name, cur);
- *(buffer + --length) = '/';
- }
-}
-
/**
* sysfs_create_link - create symlink between two objects.
* @kobj: object whose directory we're creating the link in.
@@ -112,7 +79,6 @@ int sysfs_create_link(struct kobject * kobj, struct kobject * target, const char
return error;
}
-
/**
* sysfs_remove_link - remove symlink in object's directory.
* @kobj: object we're acting for.
@@ -124,24 +90,54 @@ void sysfs_remove_link(struct kobject * kobj, const char * name)
sysfs_hash_and_remove(kobj->sd, name);
}
-static int sysfs_get_target_path(struct sysfs_dirent * parent_sd,
- struct sysfs_dirent * target_sd, char *path)
+static int sysfs_get_target_path(struct sysfs_dirent *parent_sd,
+ struct sysfs_dirent *target_sd, char *path)
{
- char * s;
- int depth, size;
+ struct sysfs_dirent *base, *sd;
+ char *s = path;
+ int len = 0;
+
+ /* go up to the root, stop at the base */
+ base = parent_sd;
+ while (base->s_parent) {
+ sd = target_sd->s_parent;
+ while (sd->s_parent && base != sd)
+ sd = sd->s_parent;
+
+ if (base == sd)
+ break;
+
+ strcpy(s, "../");
+ s += 3;
+ base = base->s_parent;
+ }
+
+ /* determine end of target string for reverse fillup */
+ sd = target_sd;
+ while (sd->s_parent && sd != base) {
+ len += strlen(sd->s_name) + 1;
+ sd = sd->s_parent;
+ }
- depth = object_depth(parent_sd);
- size = object_path_length(target_sd) + depth * 3 - 1;
- if (size > PATH_MAX)
+ /* check limits */
+ if (len < 2)
+ return -EINVAL;
+ len--;
+ if ((s - path) + len > PATH_MAX)
return -ENAMETOOLONG;
- pr_debug("%s: depth = %d, size = %d\n", __FUNCTION__, depth, size);
+ /* reverse fillup of target string from target to base */
+ sd = target_sd;
+ while (sd->s_parent && sd != base) {
+ int slen = strlen(sd->s_name);
- for (s = path; depth--; s += 3)
- strcpy(s,"../");
+ len -= slen;
+ strncpy(s + len, sd->s_name, slen);
+ if (len)
+ s[--len] = '/';
- fill_object_path(target_sd, path, size);
- pr_debug("%s: path = '%s'\n", __FUNCTION__, path);
+ sd = sd->s_parent;
+ }
return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-15 08:02:43 +0000