From 03dd4cb26d967f9588437b0fc9cc0e8353322bb7 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Fri, 25 Mar 2016 03:53:42 -0300 Subject: Linux-libre 4.5-gnu --- fs/aufs/rdu.c | 375 ---------------------------------------------------------- 1 file changed, 375 deletions(-) delete mode 100644 fs/aufs/rdu.c (limited to 'fs/aufs/rdu.c') diff --git a/fs/aufs/rdu.c b/fs/aufs/rdu.c deleted file mode 100644 index a9e9e9893..000000000 --- a/fs/aufs/rdu.c +++ /dev/null @@ -1,375 +0,0 @@ -/* - * Copyright (C) 2005-2016 Junjiro R. Okajima - */ - -/* - * readdir in userspace. - */ - -#include -#include -#include -#include "aufs.h" - -/* bits for struct aufs_rdu.flags */ -#define AuRdu_CALLED 1 -#define AuRdu_CONT (1 << 1) -#define AuRdu_FULL (1 << 2) -#define au_ftest_rdu(flags, name) ((flags) & AuRdu_##name) -#define au_fset_rdu(flags, name) \ - do { (flags) |= AuRdu_##name; } while (0) -#define au_fclr_rdu(flags, name) \ - do { (flags) &= ~AuRdu_##name; } while (0) - -struct au_rdu_arg { - struct dir_context ctx; - struct aufs_rdu *rdu; - union au_rdu_ent_ul ent; - unsigned long end; - - struct super_block *sb; - int err; -}; - -static int au_rdu_fill(struct dir_context *ctx, const char *name, int nlen, - loff_t offset, u64 h_ino, unsigned int d_type) -{ - int err, len; - struct au_rdu_arg *arg = container_of(ctx, struct au_rdu_arg, ctx); - struct aufs_rdu *rdu = arg->rdu; - struct au_rdu_ent ent; - - err = 0; - arg->err = 0; - au_fset_rdu(rdu->cookie.flags, CALLED); - len = au_rdu_len(nlen); - if (arg->ent.ul + len < arg->end) { - ent.ino = h_ino; - ent.bindex = rdu->cookie.bindex; - ent.type = d_type; - ent.nlen = nlen; - if (unlikely(nlen > AUFS_MAX_NAMELEN)) - ent.type = DT_UNKNOWN; - - /* unnecessary to support mmap_sem since this is a dir */ - err = -EFAULT; - if (copy_to_user(arg->ent.e, &ent, sizeof(ent))) - goto out; - if (copy_to_user(arg->ent.e->name, name, nlen)) - goto out; - /* the terminating NULL */ - if (__put_user(0, arg->ent.e->name + nlen)) - goto out; - err = 0; - /* AuDbg("%p, %.*s\n", arg->ent.p, nlen, name); */ - arg->ent.ul += len; - rdu->rent++; - } else { - err = -EFAULT; - au_fset_rdu(rdu->cookie.flags, FULL); - rdu->full = 1; - rdu->tail = arg->ent; - } - -out: - /* AuTraceErr(err); */ - return err; -} - -static int au_rdu_do(struct file *h_file, struct au_rdu_arg *arg) -{ - int err; - loff_t offset; - struct au_rdu_cookie *cookie = &arg->rdu->cookie; - - /* we don't have to care (FMODE_32BITHASH | FMODE_64BITHASH) for ext4 */ - offset = vfsub_llseek(h_file, cookie->h_pos, SEEK_SET); - err = offset; - if (unlikely(offset != cookie->h_pos)) - goto out; - - err = 0; - do { - arg->err = 0; - au_fclr_rdu(cookie->flags, CALLED); - /* smp_mb(); */ - err = vfsub_iterate_dir(h_file, &arg->ctx); - if (err >= 0) - err = arg->err; - } while (!err - && au_ftest_rdu(cookie->flags, CALLED) - && !au_ftest_rdu(cookie->flags, FULL)); - cookie->h_pos = h_file->f_pos; - -out: - AuTraceErr(err); - return err; -} - -static int au_rdu(struct file *file, struct aufs_rdu *rdu) -{ - int err; - aufs_bindex_t bend; - struct au_rdu_arg arg = { - .ctx = { - .actor = au_rdu_fill - } - }; - struct dentry *dentry; - struct inode *inode; - struct file *h_file; - struct au_rdu_cookie *cookie = &rdu->cookie; - - err = !access_ok(VERIFY_WRITE, rdu->ent.e, rdu->sz); - if (unlikely(err)) { - err = -EFAULT; - AuTraceErr(err); - goto out; - } - rdu->rent = 0; - rdu->tail = rdu->ent; - rdu->full = 0; - arg.rdu = rdu; - arg.ent = rdu->ent; - arg.end = arg.ent.ul; - arg.end += rdu->sz; - - err = -ENOTDIR; - if (unlikely(!file->f_op->iterate)) - goto out; - - err = security_file_permission(file, MAY_READ); - AuTraceErr(err); - if (unlikely(err)) - goto out; - - dentry = file->f_path.dentry; - inode = d_inode(dentry); -#if 1 - mutex_lock(&inode->i_mutex); -#else - err = mutex_lock_killable(&inode->i_mutex); - AuTraceErr(err); - if (unlikely(err)) - goto out; -#endif - - arg.sb = inode->i_sb; - err = si_read_lock(arg.sb, AuLock_FLUSH | AuLock_NOPLM); - if (unlikely(err)) - goto out_mtx; - err = au_alive_dir(dentry); - if (unlikely(err)) - goto out_si; - /* todo: reval? */ - fi_read_lock(file); - - err = -EAGAIN; - if (unlikely(au_ftest_rdu(cookie->flags, CONT) - && cookie->generation != au_figen(file))) - goto out_unlock; - - err = 0; - if (!rdu->blk) { - rdu->blk = au_sbi(arg.sb)->si_rdblk; - if (!rdu->blk) - rdu->blk = au_dir_size(file, /*dentry*/NULL); - } - bend = au_fbstart(file); - if (cookie->bindex < bend) - cookie->bindex = bend; - bend = au_fbend_dir(file); - /* AuDbg("b%d, b%d\n", cookie->bindex, bend); */ - for (; !err && cookie->bindex <= bend; - cookie->bindex++, cookie->h_pos = 0) { - h_file = au_hf_dir(file, cookie->bindex); - if (!h_file) - continue; - - au_fclr_rdu(cookie->flags, FULL); - err = au_rdu_do(h_file, &arg); - AuTraceErr(err); - if (unlikely(au_ftest_rdu(cookie->flags, FULL) || err)) - break; - } - AuDbg("rent %llu\n", rdu->rent); - - if (!err && !au_ftest_rdu(cookie->flags, CONT)) { - rdu->shwh = !!au_opt_test(au_sbi(arg.sb)->si_mntflags, SHWH); - au_fset_rdu(cookie->flags, CONT); - cookie->generation = au_figen(file); - } - - ii_read_lock_child(inode); - fsstack_copy_attr_atime(inode, au_h_iptr(inode, au_ibstart(inode))); - ii_read_unlock(inode); - -out_unlock: - fi_read_unlock(file); -out_si: - si_read_unlock(arg.sb); -out_mtx: - mutex_unlock(&inode->i_mutex); -out: - AuTraceErr(err); - return err; -} - -static int au_rdu_ino(struct file *file, struct aufs_rdu *rdu) -{ - int err; - ino_t ino; - unsigned long long nent; - union au_rdu_ent_ul *u; - struct au_rdu_ent ent; - struct super_block *sb; - - err = 0; - nent = rdu->nent; - u = &rdu->ent; - sb = file->f_path.dentry->d_sb; - si_read_lock(sb, AuLock_FLUSH); - while (nent-- > 0) { - /* unnecessary to support mmap_sem since this is a dir */ - err = copy_from_user(&ent, u->e, sizeof(ent)); - if (!err) - err = !access_ok(VERIFY_WRITE, &u->e->ino, sizeof(ino)); - if (unlikely(err)) { - err = -EFAULT; - AuTraceErr(err); - break; - } - - /* AuDbg("b%d, i%llu\n", ent.bindex, ent.ino); */ - if (!ent.wh) - err = au_ino(sb, ent.bindex, ent.ino, ent.type, &ino); - else - err = au_wh_ino(sb, ent.bindex, ent.ino, ent.type, - &ino); - if (unlikely(err)) { - AuTraceErr(err); - break; - } - - err = __put_user(ino, &u->e->ino); - if (unlikely(err)) { - err = -EFAULT; - AuTraceErr(err); - break; - } - u->ul += au_rdu_len(ent.nlen); - } - si_read_unlock(sb); - - return err; -} - -/* ---------------------------------------------------------------------- */ - -static int au_rdu_verify(struct aufs_rdu *rdu) -{ - AuDbg("rdu{%llu, %p, %u | %u | %llu, %u, %u | " - "%llu, b%d, 0x%x, g%u}\n", - rdu->sz, rdu->ent.e, rdu->verify[AufsCtlRduV_SZ], - rdu->blk, - rdu->rent, rdu->shwh, rdu->full, - rdu->cookie.h_pos, rdu->cookie.bindex, rdu->cookie.flags, - rdu->cookie.generation); - - if (rdu->verify[AufsCtlRduV_SZ] == sizeof(*rdu)) - return 0; - - AuDbg("%u:%u\n", - rdu->verify[AufsCtlRduV_SZ], (unsigned int)sizeof(*rdu)); - return -EINVAL; -} - -long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -{ - long err, e; - struct aufs_rdu rdu; - void __user *p = (void __user *)arg; - - err = copy_from_user(&rdu, p, sizeof(rdu)); - if (unlikely(err)) { - err = -EFAULT; - AuTraceErr(err); - goto out; - } - err = au_rdu_verify(&rdu); - if (unlikely(err)) - goto out; - - switch (cmd) { - case AUFS_CTL_RDU: - err = au_rdu(file, &rdu); - if (unlikely(err)) - break; - - e = copy_to_user(p, &rdu, sizeof(rdu)); - if (unlikely(e)) { - err = -EFAULT; - AuTraceErr(err); - } - break; - case AUFS_CTL_RDU_INO: - err = au_rdu_ino(file, &rdu); - break; - - default: - /* err = -ENOTTY; */ - err = -EINVAL; - } - -out: - AuTraceErr(err); - return err; -} - -#ifdef CONFIG_COMPAT -long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -{ - long err, e; - struct aufs_rdu rdu; - void __user *p = compat_ptr(arg); - - /* todo: get_user()? */ - err = copy_from_user(&rdu, p, sizeof(rdu)); - if (unlikely(err)) { - err = -EFAULT; - AuTraceErr(err); - goto out; - } - rdu.ent.e = compat_ptr(rdu.ent.ul); - err = au_rdu_verify(&rdu); - if (unlikely(err)) - goto out; - - switch (cmd) { - case AUFS_CTL_RDU: - err = au_rdu(file, &rdu); - if (unlikely(err)) - break; - - rdu.ent.ul = ptr_to_compat(rdu.ent.e); - rdu.tail.ul = ptr_to_compat(rdu.tail.e); - e = copy_to_user(p, &rdu, sizeof(rdu)); - if (unlikely(e)) { - err = -EFAULT; - AuTraceErr(err); - } - break; - case AUFS_CTL_RDU_INO: - err = au_rdu_ino(file, &rdu); - break; - - default: - /* err = -ENOTTY; */ - err = -EINVAL; - } - -out: - AuTraceErr(err); - return err; -} -#endif -- cgit v1.2.3-54-g00ecf