Messages in this thread Patch in this message | | | From | (Eric W. Biederman) | Date | Thu, 03 Jul 2008 18:09:04 -0700 | Subject | [PATCH 04/15] sysfs: Implement __sysfs_get_dentry |
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This function is similar but much simpler to sysfs_get_dentry returns a sysfs dentry if one curently exists.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Benjamin Thery <benjamin.thery@bull.net> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com> Acked-by: Tejun Heo <tj@kernel.org> --- fs/sysfs/dir.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 files changed, 39 insertions(+), 0 deletions(-)
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index 69c40ed..df9934a 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -764,6 +764,45 @@ void sysfs_remove_dir(struct kobject * kobj) __sysfs_remove_dir(sd); } +/** + * __sysfs_get_dentry - get dentry for the given sysfs_dirent + * @sb: superblock of the dentry to return + * @sd: sysfs_dirent of interest + * + * Get dentry for @sd. Only return a dentry if one currently + * exists. + * + * LOCKING: + * Kernel thread context (may sleep) + * + * RETURNS: + * Pointer to found dentry on success, NULL on failure. + */ +static struct dentry *__sysfs_get_dentry(struct super_block *sb, + struct sysfs_dirent *sd) +{ + struct inode *inode; + struct dentry *dentry = NULL; + + inode = ilookup5_nowait(sysfs_sb, sd->s_ino, sysfs_ilookup_test, sd); + if (inode && !(inode->i_state & I_NEW)) { + struct dentry *alias; + spin_lock(&dcache_lock); + list_for_each_entry(alias, &inode->i_dentry, d_alias) { + if (!IS_ROOT(alias) && d_unhashed(alias)) + continue; + if (alias->d_sb != sb) + continue; + dentry = alias; + dget_locked(dentry); + break; + } + spin_unlock(&dcache_lock); + } + iput(inode); + return dentry; +} + int sysfs_rename_dir(struct kobject * kobj, const char *new_name) { struct sysfs_dirent *sd = kobj->sd; -- 1.5.3.rc6.17.g1911
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