/* * Copyright (C) 2011 Novell Inc. * Copyright (C) 2016 Red Hat, Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. */ #include #include #include #include #include "overlayfs.h" #include "ovl_entry.h" int ovl_want_write(struct dentry *dentry) { struct ovl_fs *ofs = dentry->d_sb->s_fs_info; return mnt_want_write(ofs->upper_mnt); } void ovl_drop_write(struct dentry *dentry) { struct ovl_fs *ofs = dentry->d_sb->s_fs_info; mnt_drop_write(ofs->upper_mnt); } struct dentry *ovl_workdir(struct dentry *dentry) { struct ovl_fs *ofs = dentry->d_sb->s_fs_info; return ofs->workdir; } const struct cred *ovl_override_creds(struct super_block *sb) { struct ovl_fs *ofs = sb->s_fs_info; return override_creds(ofs->creator_cred); } struct ovl_entry *ovl_alloc_entry(unsigned int numlower) { size_t size = offsetof(struct ovl_entry, lowerstack[numlower]); struct ovl_entry *oe = kzalloc(size, GFP_KERNEL); if (oe) oe->numlower = numlower; return oe; } bool ovl_dentry_remote(struct dentry *dentry) { return dentry->d_flags & (DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE | DCACHE_OP_REAL); } bool ovl_dentry_weird(struct dentry *dentry) { return dentry->d_flags & (DCACHE_NEED_AUTOMOUNT | DCACHE_MANAGE_TRANSIT | DCACHE_OP_HASH | DCACHE_OP_COMPARE); } enum ovl_path_type ovl_path_type(struct dentry *dentry) { struct ovl_entry *oe = dentry->d_fsdata; enum ovl_path_type type = 0; if (oe->__upperdentry) { type = __OVL_PATH_UPPER; /* * Non-dir dentry can hold lower dentry from previous * location. */ if (oe->numlower && d_is_dir(dentry)) type |= __OVL_PATH_MERGE; } else { if (oe->numlower > 1) type |= __OVL_PATH_MERGE; } return type; } void ovl_path_upper(struct dentry *dentry, struct path *path) { struct ovl_fs *ofs = dentry->d_sb->s_fs_info; struct ovl_entry *oe = dentry->d_fsdata; path->mnt = ofs->upper_mnt; path->dentry = ovl_upperdentry_dereference(oe); } void ovl_path_lower(struct dentry *dentry, struct path *path) { struct ovl_entry *oe = dentry->d_fsdata; *path = oe->numlower ? oe->lowerstack[0] : (struct path) { NULL, NULL }; } enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path) { enum ovl_path_type type = ovl_path_type(dentry); if (!OVL_TYPE_UPPER(type)) ovl_path_lower(dentry, path); else ovl_path_upper(dentry, path); return type; } struct dentry *ovl_dentry_upper(struct dentry *dentry) { struct ovl_entry *oe = dentry->d_fsdata; return ovl_upperdentry_dereference(oe); } static struct dentry *__ovl_dentry_lower(struct ovl_entry *oe) { return oe->numlower ? oe->lowerstack[0].dentry : NULL; } struct dentry *ovl_dentry_lower(struct dentry *dentry) { struct ovl_entry *oe = dentry->d_fsdata; return __ovl_dentry_lower(oe); } struct dentry *ovl_dentry_real(struct dentry *dentry) { struct ovl_entry *oe = dentry->d_fsdata; struct dentry *realdentry; realdentry = ovl_upperdentry_dereference(oe); if (!realdentry) realdentry = __ovl_dentry_lower(oe); return realdentry; } struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry) { struct ovl_entry *oe = dentry->d_fsdata; return oe->cache; } void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache) { struct ovl_entry *oe = dentry->d_fsdata; oe->cache = cache; } bool ovl_dentry_is_opaque(struct dentry *dentry) { struct ovl_entry *oe = dentry->d_fsdata; return oe->opaque; } bool ovl_dentry_is_whiteout(struct dentry *dentry) { return !dentry->d_inode && ovl_dentry_is_opaque(dentry); } void ovl_dentry_set_opaque(struct dentry *dentry) { struct ovl_entry *oe = dentry->d_fsdata; oe->opaque = true; } bool ovl_redirect_dir(struct super_block *sb) { struct ovl_fs *ofs = sb->s_fs_info; return ofs->config.redirect_dir; } void ovl_clear_redirect_dir(struct super_block *sb) { struct ovl_fs *ofs = sb->s_fs_info; ofs->config.redirect_dir = false; } const char *ovl_dentry_get_redirect(struct dentry *dentry) { struct ovl_entry *oe = dentry->d_fsdata; return oe->redirect; } void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect) { struct ovl_entry *oe = dentry->d_fsdata; kfree(oe->redirect); oe->redirect = redirect; } void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry) { struct ovl_entry *oe = dentry->d_fsdata; WARN_ON(!inode_is_locked(upperdentry->d_parent->d_inode)); WARN_ON(oe->__upperdentry); /* * Make sure upperdentry is consistent before making it visible to * ovl_upperdentry_dereference(). */ smp_wmb(); oe->__upperdentry = upperdentry; } void ovl_inode_init(struct inode *inode, struct inode *realinode, bool is_upper) { WRITE_ONCE(inode->i_private, (unsigned long) realinode | (is_upper ? OVL_ISUPPER_MASK : 0)); } void ovl_inode_update(struct inode *inode, struct inode *upperinode) { WARN_ON(!upperinode); WARN_ON(!inode_unhashed(inode)); WRITE_ONCE(inode->i_private, (unsigned long) upperinode | OVL_ISUPPER_MASK); if (!S_ISDIR(upperinode->i_mode)) __insert_inode_hash(inode, (unsigned long) upperinode); } void ovl_dentry_version_inc(struct dentry *dentry) { struct ovl_entry *oe = dentry->d_fsdata; WARN_ON(!inode_is_locked(dentry->d_inode)); oe->version++; } u64 ovl_dentry_version_get(struct dentry *dentry) { struct ovl_entry *oe = dentry->d_fsdata; WARN_ON(!inode_is_locked(dentry->d_inode)); return oe->version; } bool ovl_is_whiteout(struct dentry *dentry) { struct inode *inode = dentry->d_inode; return inode && IS_WHITEOUT(inode); } struct file *ovl_path_open(struct path *path, int flags) { return dentry_open(path, flags | O_NOATIME, current_cred()); } ad2bb&id2=ec026b5020688a8bde5fae9a69ae3c59b66ba3ae'>diff)parent8413299cb3933dade6186bbee8363f190032107e (diff)
Merge tag 'sti-dt-for-v4.10-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/pchotard/sti into fixes
STi DT fix: Since v4.10-rc1, xhci is complaining in loop with : [ 801.953836] usb usb6-port1: Cannot enable. Maybe the USB cable is bad? [ 801.960455] xhci-hcd xhci-hcd.0.auto: Cannot set link state. [ 801.966611] usb usb6-port1: cannot disable (err = -32) set property "snps,dis_u3_susphy_quirk" in DT fix it. * tag 'sti-dt-for-v4.10-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/pchotard/sti: ARM: dts: STiH407-family: set snps,dis_u3_susphy_quirk Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'include')