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| author | Eric W. Biederman <ebiederm@xmission.com> | 2010-02-12 19:22:25 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-03-07 17:04:52 -0800 |
| commit | 7cb32942d91a501b2df944928ccc9e6590ab237b (patch) | |
| tree | 7c6ff2a82705d7dda8a566702f3bab981d03bf54 /fs/sysfs/symlink.c | |
| parent | 19c38b632d4554329986021fd66bdea468cf452c (diff) | |
| download | linux-7cb32942d91a501b2df944928ccc9e6590ab237b.tar.gz | |
sysfs: Implement sysfs_rename_link
Because of rename ordering problems we occassionally give false warnings about invalid sysfs operations. So using sysfs_rename create a sysfs_rename_link function that doesn't need strange workarounds. Cc: Benjamin Thery <benjamin.thery@bull.net> Cc: Daniel Lezcano <dlezcano@fr.ibm.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs/symlink.c')
| -rw-r--r-- | fs/sysfs/symlink.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c index c5eff49fa41b..1b9a3a1e8a17 100644 --- a/fs/sysfs/symlink.c +++ b/fs/sysfs/symlink.c @@ -123,6 +123,44 @@ void sysfs_remove_link(struct kobject * kobj, const char * name) sysfs_hash_and_remove(parent_sd, name); } +/** + * sysfs_rename_link - rename symlink in object's directory. + * @kobj: object we're acting for. + * @targ: object we're pointing to. + * @old: previous name of the symlink. + * @new: new name of the symlink. + * + * A helper function for the common rename symlink idiom. + */ +int sysfs_rename_link(struct kobject *kobj, struct kobject *targ, + const char *old, const char *new) +{ + struct sysfs_dirent *parent_sd, *sd = NULL; + int result; + + if (!kobj) + parent_sd = &sysfs_root; + else + parent_sd = kobj->sd; + + result = -ENOENT; + sd = sysfs_get_dirent(parent_sd, old); + if (!sd) + goto out; + + result = -EINVAL; + if (sysfs_type(sd) != SYSFS_KOBJ_LINK) + goto out; + if (sd->s_symlink.target_sd->s_dir.kobj != targ) + goto out; + + result = sysfs_rename(sd, parent_sd, new); + +out: + sysfs_put(sd); + return result; +} + static int sysfs_get_target_path(struct sysfs_dirent *parent_sd, struct sysfs_dirent *target_sd, char *path) { |