diff options
Diffstat (limited to 'fs/sysfs/dir.c')
| -rw-r--r-- | fs/sysfs/dir.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index cfd290d3d6b1..bea1f4c02b9b 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -50,6 +50,32 @@ static struct sysfs_dirent * sysfs_new_dirent(struct sysfs_dirent * parent_sd, return sd; } +/** + * + * Return -EEXIST if there is already a sysfs element with the same name for + * the same parent. + * + * called with parent inode's i_mutex held + */ +int sysfs_dirent_exist(struct sysfs_dirent *parent_sd, + const unsigned char *new) +{ + struct sysfs_dirent * sd; + + list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { + if (sd->s_element) { + const unsigned char *existing = sysfs_get_name(sd); + if (strcmp(existing, new)) + continue; + else + return -EEXIST; + } + } + + return 0; +} + + int sysfs_make_dirent(struct sysfs_dirent * parent_sd, struct dentry * dentry, void * element, umode_t mode, int type) { @@ -102,7 +128,11 @@ static int create_dir(struct kobject * k, struct dentry * p, mutex_lock(&p->d_inode->i_mutex); *d = lookup_one_len(n, p, strlen(n)); if (!IS_ERR(*d)) { - error = sysfs_make_dirent(p->d_fsdata, *d, k, mode, SYSFS_DIR); + if (sysfs_dirent_exist(p->d_fsdata, n)) + error = -EEXIST; + else + error = sysfs_make_dirent(p->d_fsdata, *d, k, mode, + SYSFS_DIR); if (!error) { error = sysfs_create(*d, mode, init_dir); if (!error) { |