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sysfs: implement SYSFS_FLAG_REMOVED flag

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Implement SYSFS_FLAG_REMOVED flag which currently is used only to
improve sanity check in sysfs_deactivate().  The flag will be used to
make directory entries reclamiable.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Tejun Heo 2007-06-14 04:27:22 +09:00 committed by Greg Kroah-Hartman
parent b402d72cf7
commit 380e6fbb72
3 changed files with 5 additions and 1 deletions
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4
fs/sysfs/dir.c
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@ -171,7 +171,7 @@ void sysfs_deactivate(struct sysfs_dirent *sd)
DECLARE_COMPLETION_ONSTACK(wait); DECLARE_COMPLETION_ONSTACK(wait);
int v; int v;
BUG_ON(sd->s_sibling); BUG_ON(sd->s_sibling || !(sd->s_flags & SYSFS_FLAG_REMOVED));
sd->s_sibling = (void *)&wait; sd->s_sibling = (void *)&wait;
/* atomic_add_return() is a mb(), put_active() will always see /* atomic_add_return() is a mb(), put_active() will always see
@ -506,6 +506,7 @@ static void remove_dir(struct dentry * d)
mutex_lock(&parent->d_inode->i_mutex); mutex_lock(&parent->d_inode->i_mutex);
sysfs_unlink_sibling(sd); sysfs_unlink_sibling(sd);
sd->s_flags |= SYSFS_FLAG_REMOVED;
pr_debug(" o %s removing done (%d)\n",d->d_name.name, pr_debug(" o %s removing done (%d)\n",d->d_name.name,
atomic_read(&d->d_count)); atomic_read(&d->d_count));
@ -540,6 +541,7 @@ static void __sysfs_remove_dir(struct dentry *dentry)
struct sysfs_dirent *sd = *pos; struct sysfs_dirent *sd = *pos;
if (sysfs_type(sd) && (sysfs_type(sd) & SYSFS_NOT_PINNED)) { if (sysfs_type(sd) && (sysfs_type(sd) & SYSFS_NOT_PINNED)) {
sd->s_flags |= SYSFS_FLAG_REMOVED;
*pos = sd->s_sibling; *pos = sd->s_sibling;
sd->s_sibling = removed; sd->s_sibling = removed;
removed = sd; removed = sd;

1
fs/sysfs/inode.c
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@ -296,6 +296,7 @@ int sysfs_hash_and_remove(struct dentry * dir, const char * name)
if (!sysfs_type(sd)) if (!sysfs_type(sd))
continue; continue;
if (!strcmp(sd->s_name, name)) { if (!strcmp(sd->s_name, name)) {
sd->s_flags |= SYSFS_FLAG_REMOVED;
*pos = sd->s_sibling; *pos = sd->s_sibling;
sd->s_sibling = NULL; sd->s_sibling = NULL;
found = 1; found = 1;

1
include/linux/sysfs.h
View File

@ -84,6 +84,7 @@ struct sysfs_ops {
#define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK) #define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK)
#define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK #define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK
#define SYSFS_FLAG_REMOVED 0x0100
#ifdef CONFIG_SYSFS #ifdef CONFIG_SYSFS