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[PATCH vfs-2.6 1/6] vfs: replace parent == dentry->d_parent by IS_ROOT() 

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
This commit is contained in:
OGAWA Hirofumi 2008-10-16 07:50:27 +09:00 committed by Al Viro
parent 9fbb76ce0f
commit 871c0067d5
2 changed files with 14 additions and 11 deletions
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21
fs/dcache.c
View File

@ -174,9 +174,12 @@ static struct dentry *d_kill(struct dentry *dentry)
dentry_stat.nr_dentry--; /* For d_free, below */ dentry_stat.nr_dentry--; /* For d_free, below */
/*drops the locks, at that point nobody can reach this dentry */ /*drops the locks, at that point nobody can reach this dentry */
dentry_iput(dentry); dentry_iput(dentry);
parent = dentry->d_parent; if (IS_ROOT(dentry))
parent = NULL;
else
parent = dentry->d_parent;
d_free(dentry); d_free(dentry);
return dentry == parent ? NULL : parent; return parent;
} }
/* /*
@ -666,11 +669,12 @@ static void shrink_dcache_for_umount_subtree(struct dentry *dentry)
BUG(); BUG();
} }
parent = dentry->d_parent; if (IS_ROOT(dentry))
if (parent == dentry)
parent = NULL; parent = NULL;
else else {
parent = dentry->d_parent;
atomic_dec(&parent->d_count); atomic_dec(&parent->d_count);
}
list_del(&dentry->d_u.d_child); list_del(&dentry->d_u.d_child);
detached++; detached++;
@ -1723,7 +1727,7 @@ static int d_isparent(struct dentry *p1, struct dentry *p2)
{ {
struct dentry *p; struct dentry *p;
for (p = p2; p->d_parent != p; p = p->d_parent) { for (p = p2; !IS_ROOT(p); p = p->d_parent) {
if (p->d_parent == p1) if (p->d_parent == p1)
return 1; return 1;
} }
@ -2168,10 +2172,9 @@ int is_subdir(struct dentry * new_dentry, struct dentry * old_dentry)
seq = read_seqbegin(&rename_lock); seq = read_seqbegin(&rename_lock);
for (;;) { for (;;) {
if (new_dentry != old_dentry) { if (new_dentry != old_dentry) {
struct dentry * parent = new_dentry->d_parent; if (IS_ROOT(new_dentry))
if (parent == new_dentry)
break; break;
new_dentry = parent; new_dentry = new_dentry->d_parent;
continue; continue;
} }
result = 1; result = 1;

4
fs/namei.c
View File

@ -1454,7 +1454,7 @@ struct dentry *lock_rename(struct dentry *p1, struct dentry *p2)
mutex_lock(&p1->d_inode->i_sb->s_vfs_rename_mutex); mutex_lock(&p1->d_inode->i_sb->s_vfs_rename_mutex);
for (p = p1; p->d_parent != p; p = p->d_parent) { for (p = p1; !IS_ROOT(p); p = p->d_parent) {
if (p->d_parent == p2) { if (p->d_parent == p2) {
mutex_lock_nested(&p2->d_inode->i_mutex, I_MUTEX_PARENT); mutex_lock_nested(&p2->d_inode->i_mutex, I_MUTEX_PARENT);
mutex_lock_nested(&p1->d_inode->i_mutex, I_MUTEX_CHILD); mutex_lock_nested(&p1->d_inode->i_mutex, I_MUTEX_CHILD);
@ -1462,7 +1462,7 @@ struct dentry *lock_rename(struct dentry *p1, struct dentry *p2)
} }
} }
for (p = p2; p->d_parent != p; p = p->d_parent) { for (p = p2; !IS_ROOT(p); p = p->d_parent) {
if (p->d_parent == p1) { if (p->d_parent == p1) {
mutex_lock_nested(&p1->d_inode->i_mutex, I_MUTEX_PARENT); mutex_lock_nested(&p1->d_inode->i_mutex, I_MUTEX_PARENT);
mutex_lock_nested(&p2->d_inode->i_mutex, I_MUTEX_CHILD); mutex_lock_nested(&p2->d_inode->i_mutex, I_MUTEX_CHILD);