diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/Kconfig | 6 | ||||
| -rw-r--r-- | fs/exec.c | 2 | ||||
| -rw-r--r-- | fs/locks.c | 9 | ||||
| -rw-r--r-- | fs/proc/base.c | 21 |
4 files changed, 29 insertions, 9 deletions
diff --git a/fs/Kconfig b/fs/Kconfig index 2524629dc83..f9b5842c8d2 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -842,6 +842,12 @@ config TMPFS config HUGETLBFS bool "HugeTLB file system support" depends X86 || IA64 || PPC64 || SPARC64 || SUPERH || BROKEN + help + hugetlbfs is a filesystem backing for HugeTLB pages, based on + ramfs. For architectures that support it, say Y here and read + <file:Documentation/vm/hugetlbpage.txt> for details. + + If unsure, say N. config HUGETLB_PAGE def_bool HUGETLBFS diff --git a/fs/exec.c b/fs/exec.c index 4121bb55973..3a79d97ac23 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -712,7 +712,7 @@ static int de_thread(struct task_struct *tsk) attach_pid(current, PIDTYPE_PID, current->pid); attach_pid(current, PIDTYPE_PGID, current->signal->pgrp); attach_pid(current, PIDTYPE_SID, current->signal->session); - list_add_tail(¤t->tasks, &init_task.tasks); + list_add_tail_rcu(¤t->tasks, &init_task.tasks); current->group_leader = current; leader->group_leader = current; diff --git a/fs/locks.c b/fs/locks.c index dda83d6cd48..efad798824d 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -2230,7 +2230,12 @@ void steal_locks(fl_owner_t from) lock_kernel(); j = 0; - rcu_read_lock(); + + /* + * We are not taking a ref to the file structures, so + * we need to acquire ->file_lock. + */ + spin_lock(&files->file_lock); fdt = files_fdtable(files); for (;;) { unsigned long set; @@ -2248,7 +2253,7 @@ void steal_locks(fl_owner_t from) set >>= 1; } } - rcu_read_unlock(); + spin_unlock(&files->file_lock); unlock_kernel(); } EXPORT_SYMBOL(steal_locks); diff --git a/fs/proc/base.c b/fs/proc/base.c index a3a3eecef68..6cc77dc3f3f 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -297,16 +297,20 @@ static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsm files = get_files_struct(task); if (files) { - rcu_read_lock(); + /* + * We are not taking a ref to the file structure, so we must + * hold ->file_lock. + */ + spin_lock(&files->file_lock); file = fcheck_files(files, fd); if (file) { *mnt = mntget(file->f_vfsmnt); *dentry = dget(file->f_dentry); - rcu_read_unlock(); + spin_unlock(&files->file_lock); put_files_struct(files); return 0; } - rcu_read_unlock(); + spin_unlock(&files->file_lock); put_files_struct(files); } return -ENOENT; @@ -1523,7 +1527,12 @@ static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, if (!files) goto out_unlock; inode->i_mode = S_IFLNK; - rcu_read_lock(); + + /* + * We are not taking a ref to the file structure, so we must + * hold ->file_lock. + */ + spin_lock(&files->file_lock); file = fcheck_files(files, fd); if (!file) goto out_unlock2; @@ -1531,7 +1540,7 @@ static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, inode->i_mode |= S_IRUSR | S_IXUSR; if (file->f_mode & 2) inode->i_mode |= S_IWUSR | S_IXUSR; - rcu_read_unlock(); + spin_unlock(&files->file_lock); put_files_struct(files); inode->i_op = &proc_pid_link_inode_operations; inode->i_size = 64; @@ -1541,7 +1550,7 @@ static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, return NULL; out_unlock2: - rcu_read_unlock(); + spin_unlock(&files->file_lock); put_files_struct(files); out_unlock: iput(inode); |