Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/fs/file_table.c b/fs/file_table.c
new file mode 100644
index 0000000..03d83cb
--- /dev/null
+++ b/fs/file_table.c
@@ -0,0 +1,255 @@
+/*
+ * linux/fs/file_table.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/file.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/smp_lock.h>
+#include <linux/fs.h>
+#include <linux/security.h>
+#include <linux/eventpoll.h>
+#include <linux/mount.h>
+#include <linux/cdev.h>
+
+/* sysctl tunables... */
+struct files_stat_struct files_stat = {
+ .max_files = NR_FILE
+};
+
+EXPORT_SYMBOL(files_stat); /* Needed by unix.o */
+
+/* public. Not pretty! */
+ __cacheline_aligned_in_smp DEFINE_SPINLOCK(files_lock);
+
+static DEFINE_SPINLOCK(filp_count_lock);
+
+/* slab constructors and destructors are called from arbitrary
+ * context and must be fully threaded - use a local spinlock
+ * to protect files_stat.nr_files
+ */
+void filp_ctor(void * objp, struct kmem_cache_s *cachep, unsigned long cflags)
+{
+ if ((cflags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+ SLAB_CTOR_CONSTRUCTOR) {
+ unsigned long flags;
+ spin_lock_irqsave(&filp_count_lock, flags);
+ files_stat.nr_files++;
+ spin_unlock_irqrestore(&filp_count_lock, flags);
+ }
+}
+
+void filp_dtor(void * objp, struct kmem_cache_s *cachep, unsigned long dflags)
+{
+ unsigned long flags;
+ spin_lock_irqsave(&filp_count_lock, flags);
+ files_stat.nr_files--;
+ spin_unlock_irqrestore(&filp_count_lock, flags);
+}
+
+static inline void file_free(struct file *f)
+{
+ kmem_cache_free(filp_cachep, f);
+}
+
+/* Find an unused file structure and return a pointer to it.
+ * Returns NULL, if there are no more free file structures or
+ * we run out of memory.
+ */
+struct file *get_empty_filp(void)
+{
+static int old_max;
+ struct file * f;
+
+ /*
+ * Privileged users can go above max_files
+ */
+ if (files_stat.nr_files < files_stat.max_files ||
+ capable(CAP_SYS_ADMIN)) {
+ f = kmem_cache_alloc(filp_cachep, GFP_KERNEL);
+ if (f) {
+ memset(f, 0, sizeof(*f));
+ if (security_file_alloc(f)) {
+ file_free(f);
+ goto fail;
+ }
+ eventpoll_init_file(f);
+ atomic_set(&f->f_count, 1);
+ f->f_uid = current->fsuid;
+ f->f_gid = current->fsgid;
+ rwlock_init(&f->f_owner.lock);
+ /* f->f_version: 0 */
+ INIT_LIST_HEAD(&f->f_list);
+ f->f_maxcount = INT_MAX;
+ return f;
+ }
+ }
+
+ /* Ran out of filps - report that */
+ if (files_stat.max_files >= old_max) {
+ printk(KERN_INFO "VFS: file-max limit %d reached\n",
+ files_stat.max_files);
+ old_max = files_stat.max_files;
+ } else {
+ /* Big problems... */
+ printk(KERN_WARNING "VFS: filp allocation failed\n");
+ }
+fail:
+ return NULL;
+}
+
+EXPORT_SYMBOL(get_empty_filp);
+
+void fastcall fput(struct file *file)
+{
+ if (atomic_dec_and_test(&file->f_count))
+ __fput(file);
+}
+
+EXPORT_SYMBOL(fput);
+
+/* __fput is called from task context when aio completion releases the last
+ * last use of a struct file *. Do not use otherwise.
+ */
+void fastcall __fput(struct file *file)
+{
+ struct dentry *dentry = file->f_dentry;
+ struct vfsmount *mnt = file->f_vfsmnt;
+ struct inode *inode = dentry->d_inode;
+
+ might_sleep();
+ /*
+ * The function eventpoll_release() should be the first called
+ * in the file cleanup chain.
+ */
+ eventpoll_release(file);
+ locks_remove_flock(file);
+
+ if (file->f_op && file->f_op->release)
+ file->f_op->release(inode, file);
+ security_file_free(file);
+ if (unlikely(inode->i_cdev != NULL))
+ cdev_put(inode->i_cdev);
+ fops_put(file->f_op);
+ if (file->f_mode & FMODE_WRITE)
+ put_write_access(inode);
+ file_kill(file);
+ file->f_dentry = NULL;
+ file->f_vfsmnt = NULL;
+ file_free(file);
+ dput(dentry);
+ mntput(mnt);
+}
+
+struct file fastcall *fget(unsigned int fd)
+{
+ struct file *file;
+ struct files_struct *files = current->files;
+
+ spin_lock(&files->file_lock);
+ file = fcheck_files(files, fd);
+ if (file)
+ get_file(file);
+ spin_unlock(&files->file_lock);
+ return file;
+}
+
+EXPORT_SYMBOL(fget);
+
+/*
+ * Lightweight file lookup - no refcnt increment if fd table isn't shared.
+ * You can use this only if it is guranteed that the current task already
+ * holds a refcnt to that file. That check has to be done at fget() only
+ * and a flag is returned to be passed to the corresponding fput_light().
+ * There must not be a cloning between an fget_light/fput_light pair.
+ */
+struct file fastcall *fget_light(unsigned int fd, int *fput_needed)
+{
+ struct file *file;
+ struct files_struct *files = current->files;
+
+ *fput_needed = 0;
+ if (likely((atomic_read(&files->count) == 1))) {
+ file = fcheck_files(files, fd);
+ } else {
+ spin_lock(&files->file_lock);
+ file = fcheck_files(files, fd);
+ if (file) {
+ get_file(file);
+ *fput_needed = 1;
+ }
+ spin_unlock(&files->file_lock);
+ }
+ return file;
+}
+
+
+void put_filp(struct file *file)
+{
+ if (atomic_dec_and_test(&file->f_count)) {
+ security_file_free(file);
+ file_kill(file);
+ file_free(file);
+ }
+}
+
+void file_move(struct file *file, struct list_head *list)
+{
+ if (!list)
+ return;
+ file_list_lock();
+ list_move(&file->f_list, list);
+ file_list_unlock();
+}
+
+void file_kill(struct file *file)
+{
+ if (!list_empty(&file->f_list)) {
+ file_list_lock();
+ list_del_init(&file->f_list);
+ file_list_unlock();
+ }
+}
+
+int fs_may_remount_ro(struct super_block *sb)
+{
+ struct list_head *p;
+
+ /* Check that no files are currently opened for writing. */
+ file_list_lock();
+ list_for_each(p, &sb->s_files) {
+ struct file *file = list_entry(p, struct file, f_list);
+ struct inode *inode = file->f_dentry->d_inode;
+
+ /* File with pending delete? */
+ if (inode->i_nlink == 0)
+ goto too_bad;
+
+ /* Writeable file? */
+ if (S_ISREG(inode->i_mode) && (file->f_mode & FMODE_WRITE))
+ goto too_bad;
+ }
+ file_list_unlock();
+ return 1; /* Tis' cool bro. */
+too_bad:
+ file_list_unlock();
+ return 0;
+}
+
+void __init files_init(unsigned long mempages)
+{
+ int n;
+ /* One file with associated inode and dcache is very roughly 1K.
+ * Per default don't use more than 10% of our memory for files.
+ */
+
+ n = (mempages * (PAGE_SIZE / 1024)) / 10;
+ files_stat.max_files = n;
+ if (files_stat.max_files < NR_FILE)
+ files_stat.max_files = NR_FILE;
+}