From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/fs/kernfs/inode.c | 372 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 372 insertions(+) create mode 100644 kernel/fs/kernfs/inode.c (limited to 'kernel/fs/kernfs/inode.c') diff --git a/kernel/fs/kernfs/inode.c b/kernel/fs/kernfs/inode.c new file mode 100644 index 000000000..756dd56aa --- /dev/null +++ b/kernel/fs/kernfs/inode.c @@ -0,0 +1,372 @@ +/* + * fs/kernfs/inode.c - kernfs inode implementation + * + * Copyright (c) 2001-3 Patrick Mochel + * Copyright (c) 2007 SUSE Linux Products GmbH + * Copyright (c) 2007, 2013 Tejun Heo + * + * This file is released under the GPLv2. + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "kernfs-internal.h" + +static const struct address_space_operations kernfs_aops = { + .readpage = simple_readpage, + .write_begin = simple_write_begin, + .write_end = simple_write_end, +}; + +static const struct inode_operations kernfs_iops = { + .permission = kernfs_iop_permission, + .setattr = kernfs_iop_setattr, + .getattr = kernfs_iop_getattr, + .setxattr = kernfs_iop_setxattr, + .removexattr = kernfs_iop_removexattr, + .getxattr = kernfs_iop_getxattr, + .listxattr = kernfs_iop_listxattr, +}; + +static struct kernfs_iattrs *kernfs_iattrs(struct kernfs_node *kn) +{ + static DEFINE_MUTEX(iattr_mutex); + struct kernfs_iattrs *ret; + struct iattr *iattrs; + + mutex_lock(&iattr_mutex); + + if (kn->iattr) + goto out_unlock; + + kn->iattr = kzalloc(sizeof(struct kernfs_iattrs), GFP_KERNEL); + if (!kn->iattr) + goto out_unlock; + iattrs = &kn->iattr->ia_iattr; + + /* assign default attributes */ + iattrs->ia_mode = kn->mode; + iattrs->ia_uid = GLOBAL_ROOT_UID; + iattrs->ia_gid = GLOBAL_ROOT_GID; + iattrs->ia_atime = iattrs->ia_mtime = iattrs->ia_ctime = CURRENT_TIME; + + simple_xattrs_init(&kn->iattr->xattrs); +out_unlock: + ret = kn->iattr; + mutex_unlock(&iattr_mutex); + return ret; +} + +static int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr) +{ + struct kernfs_iattrs *attrs; + struct iattr *iattrs; + unsigned int ia_valid = iattr->ia_valid; + + attrs = kernfs_iattrs(kn); + if (!attrs) + return -ENOMEM; + + iattrs = &attrs->ia_iattr; + + if (ia_valid & ATTR_UID) + iattrs->ia_uid = iattr->ia_uid; + if (ia_valid & ATTR_GID) + iattrs->ia_gid = iattr->ia_gid; + if (ia_valid & ATTR_ATIME) + iattrs->ia_atime = iattr->ia_atime; + if (ia_valid & ATTR_MTIME) + iattrs->ia_mtime = iattr->ia_mtime; + if (ia_valid & ATTR_CTIME) + iattrs->ia_ctime = iattr->ia_ctime; + if (ia_valid & ATTR_MODE) { + umode_t mode = iattr->ia_mode; + iattrs->ia_mode = kn->mode = mode; + } + return 0; +} + +/** + * kernfs_setattr - set iattr on a node + * @kn: target node + * @iattr: iattr to set + * + * Returns 0 on success, -errno on failure. + */ +int kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr) +{ + int ret; + + mutex_lock(&kernfs_mutex); + ret = __kernfs_setattr(kn, iattr); + mutex_unlock(&kernfs_mutex); + return ret; +} + +int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr) +{ + struct inode *inode = d_inode(dentry); + struct kernfs_node *kn = dentry->d_fsdata; + int error; + + if (!kn) + return -EINVAL; + + mutex_lock(&kernfs_mutex); + error = inode_change_ok(inode, iattr); + if (error) + goto out; + + error = __kernfs_setattr(kn, iattr); + if (error) + goto out; + + /* this ignores size changes */ + setattr_copy(inode, iattr); + +out: + mutex_unlock(&kernfs_mutex); + return error; +} + +static int kernfs_node_setsecdata(struct kernfs_node *kn, void **secdata, + u32 *secdata_len) +{ + struct kernfs_iattrs *attrs; + void *old_secdata; + size_t old_secdata_len; + + attrs = kernfs_iattrs(kn); + if (!attrs) + return -ENOMEM; + + old_secdata = attrs->ia_secdata; + old_secdata_len = attrs->ia_secdata_len; + + attrs->ia_secdata = *secdata; + attrs->ia_secdata_len = *secdata_len; + + *secdata = old_secdata; + *secdata_len = old_secdata_len; + return 0; +} + +int kernfs_iop_setxattr(struct dentry *dentry, const char *name, + const void *value, size_t size, int flags) +{ + struct kernfs_node *kn = dentry->d_fsdata; + struct kernfs_iattrs *attrs; + void *secdata; + int error; + u32 secdata_len = 0; + + attrs = kernfs_iattrs(kn); + if (!attrs) + return -ENOMEM; + + if (!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN)) { + const char *suffix = name + XATTR_SECURITY_PREFIX_LEN; + error = security_inode_setsecurity(d_inode(dentry), suffix, + value, size, flags); + if (error) + return error; + error = security_inode_getsecctx(d_inode(dentry), + &secdata, &secdata_len); + if (error) + return error; + + mutex_lock(&kernfs_mutex); + error = kernfs_node_setsecdata(kn, &secdata, &secdata_len); + mutex_unlock(&kernfs_mutex); + + if (secdata) + security_release_secctx(secdata, secdata_len); + return error; + } else if (!strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN)) { + return simple_xattr_set(&attrs->xattrs, name, value, size, + flags); + } + + return -EINVAL; +} + +int kernfs_iop_removexattr(struct dentry *dentry, const char *name) +{ + struct kernfs_node *kn = dentry->d_fsdata; + struct kernfs_iattrs *attrs; + + attrs = kernfs_iattrs(kn); + if (!attrs) + return -ENOMEM; + + return simple_xattr_remove(&attrs->xattrs, name); +} + +ssize_t kernfs_iop_getxattr(struct dentry *dentry, const char *name, void *buf, + size_t size) +{ + struct kernfs_node *kn = dentry->d_fsdata; + struct kernfs_iattrs *attrs; + + attrs = kernfs_iattrs(kn); + if (!attrs) + return -ENOMEM; + + return simple_xattr_get(&attrs->xattrs, name, buf, size); +} + +ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size) +{ + struct kernfs_node *kn = dentry->d_fsdata; + struct kernfs_iattrs *attrs; + + attrs = kernfs_iattrs(kn); + if (!attrs) + return -ENOMEM; + + return simple_xattr_list(&attrs->xattrs, buf, size); +} + +static inline void set_default_inode_attr(struct inode *inode, umode_t mode) +{ + inode->i_mode = mode; + inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; +} + +static inline void set_inode_attr(struct inode *inode, struct iattr *iattr) +{ + inode->i_uid = iattr->ia_uid; + inode->i_gid = iattr->ia_gid; + inode->i_atime = iattr->ia_atime; + inode->i_mtime = iattr->ia_mtime; + inode->i_ctime = iattr->ia_ctime; +} + +static void kernfs_refresh_inode(struct kernfs_node *kn, struct inode *inode) +{ + struct kernfs_iattrs *attrs = kn->iattr; + + inode->i_mode = kn->mode; + if (attrs) { + /* + * kernfs_node has non-default attributes get them from + * persistent copy in kernfs_node. + */ + set_inode_attr(inode, &attrs->ia_iattr); + security_inode_notifysecctx(inode, attrs->ia_secdata, + attrs->ia_secdata_len); + } + + if (kernfs_type(kn) == KERNFS_DIR) + set_nlink(inode, kn->dir.subdirs + 2); +} + +int kernfs_iop_getattr(struct vfsmount *mnt, struct dentry *dentry, + struct kstat *stat) +{ + struct kernfs_node *kn = dentry->d_fsdata; + struct inode *inode = d_inode(dentry); + + mutex_lock(&kernfs_mutex); + kernfs_refresh_inode(kn, inode); + mutex_unlock(&kernfs_mutex); + + generic_fillattr(inode, stat); + return 0; +} + +static void kernfs_init_inode(struct kernfs_node *kn, struct inode *inode) +{ + kernfs_get(kn); + inode->i_private = kn; + inode->i_mapping->a_ops = &kernfs_aops; + inode->i_op = &kernfs_iops; + + set_default_inode_attr(inode, kn->mode); + kernfs_refresh_inode(kn, inode); + + /* initialize inode according to type */ + switch (kernfs_type(kn)) { + case KERNFS_DIR: + inode->i_op = &kernfs_dir_iops; + inode->i_fop = &kernfs_dir_fops; + if (kn->flags & KERNFS_EMPTY_DIR) + make_empty_dir_inode(inode); + break; + case KERNFS_FILE: + inode->i_size = kn->attr.size; + inode->i_fop = &kernfs_file_fops; + break; + case KERNFS_LINK: + inode->i_op = &kernfs_symlink_iops; + break; + default: + BUG(); + } + + unlock_new_inode(inode); +} + +/** + * kernfs_get_inode - get inode for kernfs_node + * @sb: super block + * @kn: kernfs_node to allocate inode for + * + * Get inode for @kn. If such inode doesn't exist, a new inode is + * allocated and basics are initialized. New inode is returned + * locked. + * + * LOCKING: + * Kernel thread context (may sleep). + * + * RETURNS: + * Pointer to allocated inode on success, NULL on failure. + */ +struct inode *kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn) +{ + struct inode *inode; + + inode = iget_locked(sb, kn->ino); + if (inode && (inode->i_state & I_NEW)) + kernfs_init_inode(kn, inode); + + return inode; +} + +/* + * The kernfs_node serves as both an inode and a directory entry for + * kernfs. To prevent the kernfs inode numbers from being freed + * prematurely we take a reference to kernfs_node from the kernfs inode. A + * super_operations.evict_inode() implementation is needed to drop that + * reference upon inode destruction. + */ +void kernfs_evict_inode(struct inode *inode) +{ + struct kernfs_node *kn = inode->i_private; + + truncate_inode_pages_final(&inode->i_data); + clear_inode(inode); + kernfs_put(kn); +} + +int kernfs_iop_permission(struct inode *inode, int mask) +{ + struct kernfs_node *kn; + + if (mask & MAY_NOT_BLOCK) + return -ECHILD; + + kn = inode->i_private; + + mutex_lock(&kernfs_mutex); + kernfs_refresh_inode(kn, inode); + mutex_unlock(&kernfs_mutex); + + return generic_permission(inode, mask); +} -- cgit 1.2.3-korg