#include #include #include #include #include #include #include "internal.h" /* * Replace the fs->{rootmnt,root} with {mnt,dentry}. Put the old values. * It can block. */ void set_fs_root(struct fs_struct *fs, const struct path *path) { struct path old_root; path_get(path); spin_lock(&fs->lock); write_seqcount_begin(&fs->seq); old_root = fs->root; fs->root = *path; write_seqcount_end(&fs->seq); spin_unlock(&fs->lock); if (old_root.dentry) path_put(&old_root); } /* * Replace the fs->{pwdmnt,pwd} with {mnt,dentry}. Put the old values. * It can block. */ void set_fs_pwd(struct fs_struct *fs, const struct path *path) { struct path old_pwd; path_get(path); spin_lock(&fs->lock); write_seqcount_begin(&fs->seq); old_pwd = fs->pwd; fs->pwd = *path; write_seqcount_end(&fs->seq); spin_unlock(&fs->lock); if (old_pwd.dentry) path_put(&old_pwd); } static inline int replace_path(struct path *p, const struct path *old, const struct path *new) { if (likely(p->dentry != old->dentry || p->mnt != old->mnt)) return 0; *p = *new; return 1; } void chroot_fs_refs(const struct path *old_root, const struct path *new_root) { struct task_struct *g, *p; struct fs_struct *fs; int count = 0; read_lock(&tasklist_lock); do_each_thread(g, p) { task_lock(p); fs = p->fs; if (fs) { int hits = 0; spin_lock(&fs->lock); write_seqcount_begin(&fs->seq); hits += replace_path(&fs->root, old_root, new_root); hits += replace_path(&fs->pwd, old_root, new_root); write_seqcount_end(&fs->seq); while (hits--) { count++; path_get(new_root); } spin_unlock(&fs->lock); } task_unlock(p); } while_each_thread(g, p); read_unlock(&tasklist_lock); while (count--) path_put(old_root); } void free_fs_struct(struct fs_struct *fs) { path_put(&fs->root); path_put(&fs->pwd); kmem_cache_free(fs_cachep, fs); } void exit_fs(struct task_struct *tsk) { struct fs_struct *fs = tsk->fs; if (fs) { int kill; task_lock(tsk); spin_lock(&fs->lock); tsk->fs = NULL; kill = !--fs->users; spin_unlock(&fs->lock); task_unlock(tsk); if (kill) free_fs_struct(fs); } } struct fs_struct *copy_fs_struct(struct fs_struct *old) { struct fs_struct *fs = kmem_cache_alloc(fs_cachep, GFP_KERNEL); /* We don't need to lock fs - think why ;-) */ if (fs) { fs->users = 1; fs->in_exec = 0; spin_lock_init(&fs->lock); seqcount_init(&fs->seq); fs->umask = old->umask; spin_lock(&old->lock); fs->root = old->root; path_get(&fs->root); fs->pwd = old->pwd; path_get(&fs->pwd); spin_unlock(&old->lock); } return fs; } int unshare_fs_struct(void) { struct fs_struct *fs = current->fs; struct fs_struct *new_fs = copy_fs_struct(fs); int kill; if (!new_fs) return -ENOMEM; task_lock(current); spin_lock(&fs->lock); kill = !--fs->users; current->fs = new_fs; spin_unlock(&fs->lock); task_unlock(current); if (kill) free_fs_struct(fs); return 0; } EXPORT_SYMBOL_GPL(unshare_fs_struct); int current_umask(void) { return current->fs->umask; } EXPORT_SYMBOL(current_umask); /* to be mentioned only in INIT_TASK */ struct fs_struct init_fs = { .users = 1, .lock = __SPIN_LOCK_UNLOCKED(init_fs.lock), .seq = SEQCNT_ZERO(init_fs.seq), .umask = 0022, }; ight'>Size -rw-r--r--ati_pcigart.h692log plain d---------bridge111log plain -rw-r--r--drmP.h25758log plain -rw-r--r--drm_agpsupport.h3867log plain -rw-r--r--drm_atomic.h14443log plain -rw-r--r--drm_atomic_helper.h10607log plain -rw-r--r--drm_auth.h2260log plain -rw-r--r--drm_blend.h2700log plain -rw-r--r--drm_bridge.h7977log plain -rw-r--r--drm_cache.h1763log plain -rw-r--r--drm_color_mgmt.h2166log plain -rw-r--r--drm_connector.h28613log plain -rw-r--r--drm_crtc.h28999log plain -rw-r--r--drm_crtc_helper.h3301log plain -rw-r--r--drm_debugfs_crc.h2670log plain -rw-r--r--drm_displayid.h2850log plain -rw-r--r--drm_dp_dual_mode_helper.h4532log plain -rw-r--r--drm_dp_helper.h30638log plain -rw-r--r--drm_dp_mst_helper.h16260log plain -rw-r--r--drm_drv.h14861log plain -rw-r--r--drm_edid.h14335log plain -rw-r--r--drm_encoder.h8160log plain -rw-r--r--drm_encoder_slave.h6583log plain -rw-r--r--drm_fb_cma_helper.h1929log plain -rw-r--r--drm_fb_helper.h15125log plain -rw-r--r--drm_fixed.h4825log plain -rw-r--r--drm_flip_work.h3071log plain -rw-r--r--drm_fourcc.h2748log plain -rw-r--r--drm_framebuffer.h9623log plain -rw-r--r--drm_gem.h8052log plain -rw-r--r--drm_gem_cma_helper.h2286log plain -rw-r--r--drm_global.h2011log plain -rw-r--r--drm_hashtab.h3139log plain -rw-r--r--drm_irq.h6323log plain -rw-r--r--drm_legacy.h6933log plain -rw-r--r--drm_mem_util.h2468log plain -rw-r--r--drm_mipi_dsi.h10327log plain -rw-r--r--drm_mm.h11462log plain -rw-r--r--drm_mode_config.h23728log plain -rw-r--r--drm_mode_object.h4911log plain -rw-r--r--drm_modes.h17078log plain -rw-r--r--drm_modeset_helper.h1576log plain -rw-r--r--drm_modeset_helper_vtables.h41180log plain -rw-r--r--drm_modeset_lock.h4241log plain -rw-r--r--drm_of.h2034log plain -rw-r--r--drm_os_linux.h2230log plain -rw-r--r--drm_panel.h7079log plain -rw-r--r--drm_pciids.h68035log plain -rw-r--r--drm_plane.h19435log plain -rw-r--r--drm_plane_helper.h3186log plain -rw-r--r--drm_print.h3232log plain -rw-r--r--drm_property.h11460log plain -rw-r--r--drm_rect.h5103log plain -rw-r--r--drm_simple_kms_helper.h4090log plain -rw-r--r--drm_sysfs.h300log plain -rw-r--r--drm_vma_manager.h7840log plain -rw-r--r--gma_drm.h1033log plain d---------i2c109log plain