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| author | Tejun Heo <htejun@gmail.com> | 2007-06-14 03:45:15 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-07-11 16:09:04 -0700 |
| commit | 2b29ac252afff87b8465b064ca2d9740cf1f6e52 (patch) | |
| tree | 9f4930db68ace50adc7c11feba12aafe34e2cdbe /fs/sysfs/dir.c | |
| parent | aecdcedaab49ca40620dc7dd70f67ee7269a66c9 (diff) | |
| download | linux-2b29ac252afff87b8465b064ca2d9740cf1f6e52.tar.gz linux-2b29ac252afff87b8465b064ca2d9740cf1f6e52.tar.bz2 linux-2b29ac252afff87b8465b064ca2d9740cf1f6e52.zip | |
sysfs: reimplement symlink using sysfs_dirent tree
sysfs symlink is implemented by referencing dentry and kobject from
sysfs_dirent - symlink entry references kobject, dentry is used to
walk the tree. This complicates object lifetimes rules and is
dangerous - for example, there is no way to tell to which module the
target of a symlink belongs and referencing that kobject can make it
linger after the module is gone.
This patch reimplements symlink using only sysfs_dirent tree. sd for
a symlink points and holds reference to the target sysfs_dirent and
all walking is done using sysfs_dirent tree. Simpler and safer.
Please read the following message for more info.
http://article.gmane.org/gmane.linux.kernel/510293
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs/dir.c')
| -rw-r--r-- | fs/sysfs/dir.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index e9fddcc59447..2a94dc36d166 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -54,7 +54,7 @@ void release_sysfs_dirent(struct sysfs_dirent * sd) parent_sd = sd->s_parent; if (sd->s_type & SYSFS_KOBJ_LINK) - kobject_put(sd->s_elem.symlink.target_kobj); + sysfs_put(sd->s_elem.symlink.target_sd); if (sd->s_type & SYSFS_COPY_NAME) kfree(sd->s_name); kfree(sd->s_iattr); |