forked from luck/tmp_suning_uos_patched
e9f57ebcba
Pull overlayfs updates from Miklos Szeredi: "This contains several bug fixes and a new mount option 'default_permissions' that allows read-only exported NFS filesystems to be used as lower layer" * 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs: ovl: check dentry positiveness in ovl_cleanup_whiteouts() ovl: setattr: check permissions before copy-up ovl: root: copy attr ovl: move super block magic number to magic.h ovl: use a minimal buffer in ovl_copy_xattr ovl: allow zero size xattr ovl: default permissions
203 lines
6.7 KiB
C
203 lines
6.7 KiB
C
/*
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*
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* Copyright (C) 2011 Novell Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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struct ovl_entry;
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enum ovl_path_type {
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__OVL_PATH_PURE = (1 << 0),
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__OVL_PATH_UPPER = (1 << 1),
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__OVL_PATH_MERGE = (1 << 2),
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};
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#define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER)
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#define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE)
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#define OVL_TYPE_PURE_UPPER(type) ((type) & __OVL_PATH_PURE)
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#define OVL_TYPE_MERGE_OR_LOWER(type) \
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(OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type))
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#define OVL_XATTR_PRE_NAME "trusted.overlay."
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#define OVL_XATTR_PRE_LEN 16
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#define OVL_XATTR_OPAQUE OVL_XATTR_PRE_NAME"opaque"
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static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
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{
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int err = vfs_rmdir(dir, dentry);
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pr_debug("rmdir(%pd2) = %i\n", dentry, err);
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return err;
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}
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static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry)
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{
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int err = vfs_unlink(dir, dentry, NULL);
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pr_debug("unlink(%pd2) = %i\n", dentry, err);
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return err;
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}
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static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir,
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struct dentry *new_dentry, bool debug)
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{
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int err = vfs_link(old_dentry, dir, new_dentry, NULL);
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if (debug) {
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pr_debug("link(%pd2, %pd2) = %i\n",
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old_dentry, new_dentry, err);
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}
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return err;
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}
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static inline int ovl_do_create(struct inode *dir, struct dentry *dentry,
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umode_t mode, bool debug)
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{
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int err = vfs_create(dir, dentry, mode, true);
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if (debug)
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pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
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return err;
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}
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static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry,
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umode_t mode, bool debug)
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{
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int err = vfs_mkdir(dir, dentry, mode);
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if (debug)
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pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
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return err;
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}
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static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry,
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umode_t mode, dev_t dev, bool debug)
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{
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int err = vfs_mknod(dir, dentry, mode, dev);
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if (debug) {
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pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n",
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dentry, mode, dev, err);
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}
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return err;
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}
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static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry,
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const char *oldname, bool debug)
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{
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int err = vfs_symlink(dir, dentry, oldname);
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if (debug)
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pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
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return err;
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}
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static inline int ovl_do_setxattr(struct dentry *dentry, const char *name,
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const void *value, size_t size, int flags)
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{
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int err = vfs_setxattr(dentry, name, value, size, flags);
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pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n",
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dentry, name, (int) size, (char *) value, flags, err);
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return err;
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}
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static inline int ovl_do_removexattr(struct dentry *dentry, const char *name)
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{
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int err = vfs_removexattr(dentry, name);
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pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
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return err;
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}
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static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry,
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struct inode *newdir, struct dentry *newdentry,
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unsigned int flags)
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{
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int err;
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pr_debug("rename2(%pd2, %pd2, 0x%x)\n",
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olddentry, newdentry, flags);
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err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags);
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if (err) {
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pr_debug("...rename2(%pd2, %pd2, ...) = %i\n",
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olddentry, newdentry, err);
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}
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return err;
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}
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static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry)
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{
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int err = vfs_whiteout(dir, dentry);
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pr_debug("whiteout(%pd2) = %i\n", dentry, err);
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return err;
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}
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enum ovl_path_type ovl_path_type(struct dentry *dentry);
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u64 ovl_dentry_version_get(struct dentry *dentry);
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void ovl_dentry_version_inc(struct dentry *dentry);
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void ovl_path_upper(struct dentry *dentry, struct path *path);
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void ovl_path_lower(struct dentry *dentry, struct path *path);
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enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
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int ovl_path_next(int idx, struct dentry *dentry, struct path *path);
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struct dentry *ovl_dentry_upper(struct dentry *dentry);
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struct dentry *ovl_dentry_lower(struct dentry *dentry);
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struct dentry *ovl_dentry_real(struct dentry *dentry);
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struct dentry *ovl_entry_real(struct ovl_entry *oe, bool *is_upper);
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struct vfsmount *ovl_entry_mnt_real(struct ovl_entry *oe, struct inode *inode,
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bool is_upper);
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struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry);
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bool ovl_is_default_permissions(struct inode *inode);
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void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache);
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struct dentry *ovl_workdir(struct dentry *dentry);
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int ovl_want_write(struct dentry *dentry);
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void ovl_drop_write(struct dentry *dentry);
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bool ovl_dentry_is_opaque(struct dentry *dentry);
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void ovl_dentry_set_opaque(struct dentry *dentry, bool opaque);
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bool ovl_is_whiteout(struct dentry *dentry);
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void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry);
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struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
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unsigned int flags);
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struct file *ovl_path_open(struct path *path, int flags);
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struct dentry *ovl_upper_create(struct dentry *upperdir, struct dentry *dentry,
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struct kstat *stat, const char *link);
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/* readdir.c */
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extern const struct file_operations ovl_dir_operations;
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int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
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void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list);
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void ovl_cache_free(struct list_head *list);
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/* inode.c */
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int ovl_setattr(struct dentry *dentry, struct iattr *attr);
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int ovl_permission(struct inode *inode, int mask);
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int ovl_setxattr(struct dentry *dentry, const char *name,
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const void *value, size_t size, int flags);
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ssize_t ovl_getxattr(struct dentry *dentry, const char *name,
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void *value, size_t size);
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ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
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int ovl_removexattr(struct dentry *dentry, const char *name);
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struct inode *ovl_d_select_inode(struct dentry *dentry, unsigned file_flags);
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struct inode *ovl_new_inode(struct super_block *sb, umode_t mode,
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struct ovl_entry *oe);
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static inline void ovl_copyattr(struct inode *from, struct inode *to)
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{
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to->i_uid = from->i_uid;
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to->i_gid = from->i_gid;
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}
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/* dir.c */
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extern const struct inode_operations ovl_dir_inode_operations;
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struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry);
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int ovl_create_real(struct inode *dir, struct dentry *newdentry,
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struct kstat *stat, const char *link,
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struct dentry *hardlink, bool debug);
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void ovl_cleanup(struct inode *dir, struct dentry *dentry);
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/* copy_up.c */
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int ovl_copy_up(struct dentry *dentry);
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int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
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struct path *lowerpath, struct kstat *stat);
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int ovl_copy_xattr(struct dentry *old, struct dentry *new);
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int ovl_set_attr(struct dentry *upper, struct kstat *stat);
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