^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2011 Novell Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/xattr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/rbtree.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/cred.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/ratelimit.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "overlayfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct ovl_cache_entry {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) unsigned int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) unsigned int type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) u64 real_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) u64 ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct list_head l_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct rb_node node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct ovl_cache_entry *next_maybe_whiteout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) bool is_upper;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) bool is_whiteout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) char name[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct ovl_dir_cache {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) long refcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) u64 version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct list_head entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct rb_root root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct ovl_readdir_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct dir_context ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) bool is_lowest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct rb_root *root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct list_head *list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct list_head middle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct ovl_cache_entry *first_maybe_whiteout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) int count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) bool is_upper;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) bool d_type_supported;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct ovl_dir_file {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) bool is_real;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) bool is_upper;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct ovl_dir_cache *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) struct list_head *cursor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct file *realfile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct file *upperfile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static struct ovl_cache_entry *ovl_cache_entry_from_node(struct rb_node *n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return rb_entry(n, struct ovl_cache_entry, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) static bool ovl_cache_entry_find_link(const char *name, int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct rb_node ***link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct rb_node **parent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) bool found = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct rb_node **newp = *link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) while (!found && *newp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) int cmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct ovl_cache_entry *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) *parent = *newp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) tmp = ovl_cache_entry_from_node(*newp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) cmp = strncmp(name, tmp->name, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (cmp > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) newp = &tmp->node.rb_right;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) else if (cmp < 0 || len < tmp->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) newp = &tmp->node.rb_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) found = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) *link = newp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) static struct ovl_cache_entry *ovl_cache_entry_find(struct rb_root *root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) const char *name, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct rb_node *node = root->rb_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) int cmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) while (node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) struct ovl_cache_entry *p = ovl_cache_entry_from_node(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) cmp = strncmp(name, p->name, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (cmp > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) node = p->node.rb_right;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) else if (cmp < 0 || len < p->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) node = p->node.rb_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static bool ovl_calc_d_ino(struct ovl_readdir_data *rdd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) struct ovl_cache_entry *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) /* Don't care if not doing ovl_iter() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (!rdd->dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /* Always recalc d_ino when remapping lower inode numbers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (ovl_xino_bits(rdd->dentry->d_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) /* Always recalc d_ino for parent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (strcmp(p->name, "..") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) /* If this is lower, then native d_ino will do */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) if (!rdd->is_upper)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) * Recalc d_ino for '.' and for all entries if dir is impure (contains
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * copied up entries)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if ((p->name[0] == '.' && p->len == 1) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) ovl_test_flag(OVL_IMPURE, d_inode(rdd->dentry)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static struct ovl_cache_entry *ovl_cache_entry_new(struct ovl_readdir_data *rdd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) const char *name, int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) u64 ino, unsigned int d_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) struct ovl_cache_entry *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) size_t size = offsetof(struct ovl_cache_entry, name[len + 1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) p = kmalloc(size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (!p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) memcpy(p->name, name, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) p->name[len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) p->len = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) p->type = d_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) p->real_ino = ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) p->ino = ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) /* Defer setting d_ino for upper entry to ovl_iterate() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) if (ovl_calc_d_ino(rdd, p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) p->ino = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) p->is_upper = rdd->is_upper;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) p->is_whiteout = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (d_type == DT_CHR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) p->next_maybe_whiteout = rdd->first_maybe_whiteout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) rdd->first_maybe_whiteout = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) static int ovl_cache_entry_add_rb(struct ovl_readdir_data *rdd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) const char *name, int len, u64 ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) unsigned int d_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) struct rb_node **newp = &rdd->root->rb_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) struct rb_node *parent = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) struct ovl_cache_entry *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) if (ovl_cache_entry_find_link(name, len, &newp, &parent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) p = ovl_cache_entry_new(rdd, name, len, ino, d_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (p == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) rdd->err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) list_add_tail(&p->l_node, rdd->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) rb_link_node(&p->node, parent, newp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) rb_insert_color(&p->node, rdd->root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static int ovl_fill_lowest(struct ovl_readdir_data *rdd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) const char *name, int namelen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) loff_t offset, u64 ino, unsigned int d_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) struct ovl_cache_entry *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) p = ovl_cache_entry_find(rdd->root, name, namelen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) if (p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) list_move_tail(&p->l_node, &rdd->middle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) p = ovl_cache_entry_new(rdd, name, namelen, ino, d_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (p == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) rdd->err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) list_add_tail(&p->l_node, &rdd->middle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return rdd->err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) void ovl_cache_free(struct list_head *list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) struct ovl_cache_entry *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) struct ovl_cache_entry *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) list_for_each_entry_safe(p, n, list, l_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) kfree(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) INIT_LIST_HEAD(list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) void ovl_dir_cache_free(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) struct ovl_dir_cache *cache = ovl_dir_cache(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (cache) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) ovl_cache_free(&cache->entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) kfree(cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) static void ovl_cache_put(struct ovl_dir_file *od, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) struct ovl_dir_cache *cache = od->cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) WARN_ON(cache->refcount <= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) cache->refcount--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) if (!cache->refcount) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (ovl_dir_cache(d_inode(dentry)) == cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) ovl_set_dir_cache(d_inode(dentry), NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) ovl_cache_free(&cache->entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) kfree(cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) static int ovl_fill_merge(struct dir_context *ctx, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) int namelen, loff_t offset, u64 ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) unsigned int d_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) struct ovl_readdir_data *rdd =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) container_of(ctx, struct ovl_readdir_data, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) rdd->count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (!rdd->is_lowest)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return ovl_cache_entry_add_rb(rdd, name, namelen, ino, d_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) return ovl_fill_lowest(rdd, name, namelen, offset, ino, d_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) static int ovl_check_whiteouts(struct dentry *dir, struct ovl_readdir_data *rdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) struct ovl_cache_entry *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) const struct cred *old_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) old_cred = ovl_override_creds(rdd->dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) err = down_write_killable(&dir->d_inode->i_rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) while (rdd->first_maybe_whiteout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) p = rdd->first_maybe_whiteout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) rdd->first_maybe_whiteout = p->next_maybe_whiteout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) dentry = lookup_one_len(p->name, dir, p->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (!IS_ERR(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) p->is_whiteout = ovl_is_whiteout(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) dput(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) inode_unlock(dir->d_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) ovl_revert_creds(rdd->dentry->d_sb, old_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) static inline int ovl_dir_read(struct path *realpath,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) struct ovl_readdir_data *rdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) struct file *realfile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) realfile = ovl_path_open(realpath, O_RDONLY | O_LARGEFILE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (IS_ERR(realfile))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return PTR_ERR(realfile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) rdd->first_maybe_whiteout = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) rdd->ctx.pos = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) rdd->count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) rdd->err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) err = iterate_dir(realfile, &rdd->ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (err >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) err = rdd->err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) } while (!err && rdd->count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (!err && rdd->first_maybe_whiteout && rdd->dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) err = ovl_check_whiteouts(realpath->dentry, rdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) fput(realfile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) static void ovl_dir_reset(struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) struct ovl_dir_file *od = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) struct ovl_dir_cache *cache = od->cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) struct dentry *dentry = file->f_path.dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) bool is_real;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) if (cache && ovl_dentry_version_get(dentry) != cache->version) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) ovl_cache_put(od, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) od->cache = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) od->cursor = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) is_real = ovl_dir_is_real(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) if (od->is_real != is_real) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) /* is_real can only become false when dir is copied up */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) if (WARN_ON(is_real))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) od->is_real = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) static int ovl_dir_read_merged(struct dentry *dentry, struct list_head *list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) struct rb_root *root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) struct path realpath;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) struct ovl_readdir_data rdd = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) .ctx.actor = ovl_fill_merge,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) .dentry = dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) .list = list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) .root = root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) .is_lowest = false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) int idx, next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) for (idx = 0; idx != -1; idx = next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) next = ovl_path_next(idx, dentry, &realpath);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) rdd.is_upper = ovl_dentry_upper(dentry) == realpath.dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) if (next != -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) err = ovl_dir_read(&realpath, &rdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) * Insert lowest layer entries before upper ones, this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) * allows offsets to be reasonably constant
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) list_add(&rdd.middle, rdd.list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) rdd.is_lowest = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) err = ovl_dir_read(&realpath, &rdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) list_del(&rdd.middle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) static void ovl_seek_cursor(struct ovl_dir_file *od, loff_t pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) struct list_head *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) loff_t off = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) list_for_each(p, &od->cache->entries) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) if (off >= pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) off++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) /* Cursor is safe since the cache is stable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) od->cursor = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) static struct ovl_dir_cache *ovl_cache_get(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) struct ovl_dir_cache *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) cache = ovl_dir_cache(d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) if (cache && ovl_dentry_version_get(dentry) == cache->version) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) WARN_ON(!cache->refcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) cache->refcount++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) return cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) ovl_set_dir_cache(d_inode(dentry), NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) cache = kzalloc(sizeof(struct ovl_dir_cache), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) if (!cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) cache->refcount = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) INIT_LIST_HEAD(&cache->entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) cache->root = RB_ROOT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) res = ovl_dir_read_merged(dentry, &cache->entries, &cache->root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (res) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) ovl_cache_free(&cache->entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) kfree(cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) return ERR_PTR(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) cache->version = ovl_dentry_version_get(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) ovl_set_dir_cache(d_inode(dentry), cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) return cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) /* Map inode number to lower fs unique range */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) static u64 ovl_remap_lower_ino(u64 ino, int xinobits, int fsid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) const char *name, int namelen, bool warn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) unsigned int xinoshift = 64 - xinobits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) if (unlikely(ino >> xinoshift)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) if (warn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) pr_warn_ratelimited("d_ino too big (%.*s, ino=%llu, xinobits=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) namelen, name, ino, xinobits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) return ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) * The lowest xinobit is reserved for mapping the non-peresistent inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) * numbers range, but this range is only exposed via st_ino, not here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) return ino | ((u64)fsid) << (xinoshift + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) * Set d_ino for upper entries. Non-upper entries should always report
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) * the uppermost real inode ino and should not call this function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) * When not all layer are on same fs, report real ino also for upper.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * When all layers are on the same fs, and upper has a reference to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) * copy up origin, call vfs_getattr() on the overlay entry to make
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) * sure that d_ino will be consistent with st_ino from stat(2).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) static int ovl_cache_update_ino(struct path *path, struct ovl_cache_entry *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) struct dentry *dir = path->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) struct dentry *this = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) enum ovl_path_type type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) u64 ino = p->real_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) int xinobits = ovl_xino_bits(dir->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (!ovl_same_dev(dir->d_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) if (p->name[0] == '.') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) if (p->len == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) this = dget(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) goto get;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) if (p->len == 2 && p->name[1] == '.') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) /* we shall not be moved */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) this = dget(dir->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) goto get;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) this = lookup_one_len(p->name, dir, p->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if (IS_ERR_OR_NULL(this) || !this->d_inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) if (IS_ERR(this)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) err = PTR_ERR(this);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) this = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) get:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) type = ovl_path_type(this);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) if (OVL_TYPE_ORIGIN(type)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) struct kstat stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) struct path statpath = *path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) statpath.dentry = this;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) err = vfs_getattr(&statpath, &stat, STATX_INO, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) * Directory inode is always on overlay st_dev.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) * Non-dir with ovl_same_dev() could be on pseudo st_dev in case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) * of xino bits overflow.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) WARN_ON_ONCE(S_ISDIR(stat.mode) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) dir->d_sb->s_dev != stat.dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) ino = stat.ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) } else if (xinobits && !OVL_TYPE_UPPER(type)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) ino = ovl_remap_lower_ino(ino, xinobits,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) ovl_layer_lower(this)->fsid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) p->name, p->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) ovl_xino_warn(dir->d_sb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) p->ino = ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) dput(this);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) pr_warn_ratelimited("failed to look up (%s) for ino (%i)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) p->name, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) static int ovl_fill_plain(struct dir_context *ctx, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) int namelen, loff_t offset, u64 ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) unsigned int d_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) struct ovl_cache_entry *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) struct ovl_readdir_data *rdd =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) container_of(ctx, struct ovl_readdir_data, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) rdd->count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) p = ovl_cache_entry_new(rdd, name, namelen, ino, d_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) if (p == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) rdd->err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) list_add_tail(&p->l_node, rdd->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) static int ovl_dir_read_impure(struct path *path, struct list_head *list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) struct rb_root *root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) struct path realpath;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) struct ovl_cache_entry *p, *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) struct ovl_readdir_data rdd = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) .ctx.actor = ovl_fill_plain,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) .list = list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) .root = root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) INIT_LIST_HEAD(list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) *root = RB_ROOT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) ovl_path_upper(path->dentry, &realpath);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) err = ovl_dir_read(&realpath, &rdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) list_for_each_entry_safe(p, n, list, l_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) if (strcmp(p->name, ".") != 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) strcmp(p->name, "..") != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) err = ovl_cache_update_ino(path, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) if (p->ino == p->real_ino) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) list_del(&p->l_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) kfree(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) struct rb_node **newp = &root->rb_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) struct rb_node *parent = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) if (WARN_ON(ovl_cache_entry_find_link(p->name, p->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) &newp, &parent)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) rb_link_node(&p->node, parent, newp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) rb_insert_color(&p->node, root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) static struct ovl_dir_cache *ovl_cache_get_impure(struct path *path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) struct dentry *dentry = path->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) struct ovl_fs *ofs = OVL_FS(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) struct ovl_dir_cache *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) cache = ovl_dir_cache(d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) if (cache && ovl_dentry_version_get(dentry) == cache->version)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) return cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) /* Impure cache is not refcounted, free it here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) ovl_dir_cache_free(d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) ovl_set_dir_cache(d_inode(dentry), NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) cache = kzalloc(sizeof(struct ovl_dir_cache), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) if (!cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) res = ovl_dir_read_impure(path, &cache->entries, &cache->root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) if (res) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) ovl_cache_free(&cache->entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) kfree(cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) return ERR_PTR(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) if (list_empty(&cache->entries)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) * A good opportunity to get rid of an unneeded "impure" flag.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) * Removing the "impure" xattr is best effort.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) if (!ovl_want_write(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) ovl_do_removexattr(ofs, ovl_dentry_upper(dentry),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) OVL_XATTR_IMPURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) ovl_drop_write(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) ovl_clear_flag(OVL_IMPURE, d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) kfree(cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) cache->version = ovl_dentry_version_get(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) ovl_set_dir_cache(d_inode(dentry), cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) return cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) struct ovl_readdir_translate {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) struct dir_context *orig_ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) struct ovl_dir_cache *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) struct dir_context ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) u64 parent_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) int fsid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) int xinobits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) bool xinowarn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) static int ovl_fill_real(struct dir_context *ctx, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) int namelen, loff_t offset, u64 ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) unsigned int d_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) struct ovl_readdir_translate *rdt =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) container_of(ctx, struct ovl_readdir_translate, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) struct dir_context *orig_ctx = rdt->orig_ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) if (rdt->parent_ino && strcmp(name, "..") == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) ino = rdt->parent_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) } else if (rdt->cache) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) struct ovl_cache_entry *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) p = ovl_cache_entry_find(&rdt->cache->root, name, namelen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) if (p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) ino = p->ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) } else if (rdt->xinobits) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) ino = ovl_remap_lower_ino(ino, rdt->xinobits, rdt->fsid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) name, namelen, rdt->xinowarn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) return orig_ctx->actor(orig_ctx, name, namelen, offset, ino, d_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) static bool ovl_is_impure_dir(struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) struct ovl_dir_file *od = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) struct inode *dir = d_inode(file->f_path.dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) * Only upper dir can be impure, but if we are in the middle of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) * iterating a lower real dir, dir could be copied up and marked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) * impure. We only want the impure cache if we started iterating
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) * a real upper dir to begin with.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) return od->is_upper && ovl_test_flag(OVL_IMPURE, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) static int ovl_iterate_real(struct file *file, struct dir_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) struct ovl_dir_file *od = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) struct dentry *dir = file->f_path.dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) const struct ovl_layer *lower_layer = ovl_layer_lower(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) struct ovl_readdir_translate rdt = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) .ctx.actor = ovl_fill_real,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) .orig_ctx = ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) .xinobits = ovl_xino_bits(dir->d_sb),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) .xinowarn = ovl_xino_warn(dir->d_sb),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) if (rdt.xinobits && lower_layer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) rdt.fsid = lower_layer->fsid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) if (OVL_TYPE_MERGE(ovl_path_type(dir->d_parent))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) struct kstat stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) struct path statpath = file->f_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) statpath.dentry = dir->d_parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) err = vfs_getattr(&statpath, &stat, STATX_INO, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) WARN_ON_ONCE(dir->d_sb->s_dev != stat.dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) rdt.parent_ino = stat.ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) if (ovl_is_impure_dir(file)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) rdt.cache = ovl_cache_get_impure(&file->f_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) if (IS_ERR(rdt.cache))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) return PTR_ERR(rdt.cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) err = iterate_dir(od->realfile, &rdt.ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) ctx->pos = rdt.ctx.pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) static int ovl_iterate(struct file *file, struct dir_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) struct ovl_dir_file *od = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) struct dentry *dentry = file->f_path.dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) struct ovl_cache_entry *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) const struct cred *old_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) old_cred = ovl_override_creds(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) if (!ctx->pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) ovl_dir_reset(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) if (od->is_real) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) * If parent is merge, then need to adjust d_ino for '..', if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) * dir is impure then need to adjust d_ino for copied up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) * entries.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) if (ovl_xino_bits(dentry->d_sb) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) (ovl_same_fs(dentry->d_sb) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) (ovl_is_impure_dir(file) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) OVL_TYPE_MERGE(ovl_path_type(dentry->d_parent))))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) err = ovl_iterate_real(file, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) err = iterate_dir(od->realfile, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) if (!od->cache) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) struct ovl_dir_cache *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) cache = ovl_cache_get(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) err = PTR_ERR(cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) if (IS_ERR(cache))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) od->cache = cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) ovl_seek_cursor(od, ctx->pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) while (od->cursor != &od->cache->entries) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) p = list_entry(od->cursor, struct ovl_cache_entry, l_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) if (!p->is_whiteout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) if (!p->ino) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) err = ovl_cache_update_ino(&file->f_path, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) if (!dir_emit(ctx, p->name, p->len, p->ino, p->type))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) od->cursor = p->l_node.next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) ctx->pos++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) ovl_revert_creds(dentry->d_sb, old_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) static loff_t ovl_dir_llseek(struct file *file, loff_t offset, int origin)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) loff_t res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) struct ovl_dir_file *od = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) inode_lock(file_inode(file));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) if (!file->f_pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) ovl_dir_reset(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) if (od->is_real) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) res = vfs_llseek(od->realfile, offset, origin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) file->f_pos = od->realfile->f_pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) res = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) switch (origin) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) case SEEK_CUR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) offset += file->f_pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) case SEEK_SET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) if (offset < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) if (offset != file->f_pos) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) file->f_pos = offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) if (od->cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) ovl_seek_cursor(od, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) res = offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) inode_unlock(file_inode(file));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) static struct file *ovl_dir_open_realfile(const struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) struct path *realpath)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) struct file *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) const struct cred *old_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) old_cred = ovl_override_creds(file_inode(file)->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) res = ovl_path_open(realpath, O_RDONLY | (file->f_flags & O_LARGEFILE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) ovl_revert_creds(file_inode(file)->i_sb, old_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) * Like ovl_real_fdget(), returns upperfile if dir was copied up since open.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) * Unlike ovl_real_fdget(), this caches upperfile in file->private_data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) * TODO: use same abstract type for file->private_data of dir and file so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) * upperfile could also be cached for files as well.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) struct file *ovl_dir_real_file(const struct file *file, bool want_upper)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) struct ovl_dir_file *od = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) struct dentry *dentry = file->f_path.dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) struct file *old, *realfile = od->realfile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) if (!OVL_TYPE_UPPER(ovl_path_type(dentry)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) return want_upper ? NULL : realfile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) * Need to check if we started out being a lower dir, but got copied up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) if (!od->is_upper) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) realfile = READ_ONCE(od->upperfile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) if (!realfile) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) struct path upperpath;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) ovl_path_upper(dentry, &upperpath);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) realfile = ovl_dir_open_realfile(file, &upperpath);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) if (IS_ERR(realfile))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) return realfile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) old = cmpxchg_release(&od->upperfile, NULL, realfile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) if (old) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) fput(realfile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) realfile = old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) return realfile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) static int ovl_dir_fsync(struct file *file, loff_t start, loff_t end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) int datasync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) struct file *realfile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) err = ovl_sync_status(OVL_FS(file->f_path.dentry->d_sb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) if (err <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) realfile = ovl_dir_real_file(file, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) err = PTR_ERR_OR_ZERO(realfile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) /* Nothing to sync for lower */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) if (!realfile || err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) return vfs_fsync_range(realfile, start, end, datasync);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) static int ovl_dir_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) struct ovl_dir_file *od = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) if (od->cache) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) inode_lock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) ovl_cache_put(od, file->f_path.dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) inode_unlock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) fput(od->realfile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) if (od->upperfile)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) fput(od->upperfile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) kfree(od);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) static int ovl_dir_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) struct path realpath;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) struct file *realfile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) struct ovl_dir_file *od;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) enum ovl_path_type type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) od = kzalloc(sizeof(struct ovl_dir_file), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) if (!od)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) type = ovl_path_real(file->f_path.dentry, &realpath);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) realfile = ovl_dir_open_realfile(file, &realpath);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) if (IS_ERR(realfile)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) kfree(od);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) return PTR_ERR(realfile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) od->realfile = realfile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) od->is_real = ovl_dir_is_real(file->f_path.dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) od->is_upper = OVL_TYPE_UPPER(type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) file->private_data = od;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) const struct file_operations ovl_dir_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) .read = generic_read_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) .open = ovl_dir_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) .iterate = ovl_iterate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) .llseek = ovl_dir_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) .fsync = ovl_dir_fsync,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) .release = ovl_dir_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) .unlocked_ioctl = ovl_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) .compat_ioctl = ovl_compat_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) struct ovl_cache_entry *p, *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) struct rb_root root = RB_ROOT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) const struct cred *old_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) old_cred = ovl_override_creds(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) err = ovl_dir_read_merged(dentry, list, &root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) ovl_revert_creds(dentry->d_sb, old_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) list_for_each_entry_safe(p, n, list, l_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) * Select whiteouts in upperdir, they should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) * be cleared when deleting this directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) if (p->is_whiteout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) if (p->is_upper)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) goto del_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) if (p->name[0] == '.') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) if (p->len == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) goto del_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) if (p->len == 2 && p->name[1] == '.')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) goto del_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) err = -ENOTEMPTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) del_entry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) list_del(&p->l_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) kfree(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) struct ovl_cache_entry *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) inode_lock_nested(upper->d_inode, I_MUTEX_CHILD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) list_for_each_entry(p, list, l_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) if (WARN_ON(!p->is_whiteout || !p->is_upper))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) dentry = lookup_one_len(p->name, upper, p->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) if (IS_ERR(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) pr_err("lookup '%s/%.*s' failed (%i)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) upper->d_name.name, p->len, p->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) (int) PTR_ERR(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) if (dentry->d_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) ovl_cleanup(upper->d_inode, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) dput(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) inode_unlock(upper->d_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) static int ovl_check_d_type(struct dir_context *ctx, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) int namelen, loff_t offset, u64 ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) unsigned int d_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) struct ovl_readdir_data *rdd =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) container_of(ctx, struct ovl_readdir_data, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) /* Even if d_type is not supported, DT_DIR is returned for . and .. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) if (!strncmp(name, ".", namelen) || !strncmp(name, "..", namelen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) if (d_type != DT_UNKNOWN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) rdd->d_type_supported = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) * Returns 1 if d_type is supported, 0 not supported/unknown. Negative values
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) * if error is encountered.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) int ovl_check_d_type_supported(struct path *realpath)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) struct ovl_readdir_data rdd = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) .ctx.actor = ovl_check_d_type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) .d_type_supported = false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) err = ovl_dir_read(realpath, &rdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) return rdd.d_type_supported;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) #define OVL_INCOMPATDIR_NAME "incompat"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) static int ovl_workdir_cleanup_recurse(struct path *path, int level)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) struct inode *dir = path->dentry->d_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) LIST_HEAD(list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) struct rb_root root = RB_ROOT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) struct ovl_cache_entry *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) struct ovl_readdir_data rdd = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) .ctx.actor = ovl_fill_merge,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) .dentry = NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) .list = &list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) .root = &root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) .is_lowest = false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) bool incompat = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) * The "work/incompat" directory is treated specially - if it is not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) * empty, instead of printing a generic error and mounting read-only,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) * we will error about incompat features and fail the mount.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) * When called from ovl_indexdir_cleanup(), path->dentry->d_name.name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) * starts with '#'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) if (level == 2 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) !strcmp(path->dentry->d_name.name, OVL_INCOMPATDIR_NAME))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) incompat = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) err = ovl_dir_read(path, &rdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) inode_lock_nested(dir, I_MUTEX_PARENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) list_for_each_entry(p, &list, l_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) if (p->name[0] == '.') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) if (p->len == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) if (p->len == 2 && p->name[1] == '.')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) } else if (incompat) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) pr_err("overlay with incompat feature '%s' cannot be mounted\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) p->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) dentry = lookup_one_len(p->name, path->dentry, p->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) if (IS_ERR(dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) if (dentry->d_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) err = ovl_workdir_cleanup(dir, path->mnt, dentry, level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) dput(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) inode_unlock(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) ovl_cache_free(&list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) int ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) struct dentry *dentry, int level)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) if (!d_is_dir(dentry) || level > 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) return ovl_cleanup(dir, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) err = ovl_do_rmdir(dir, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) struct path path = { .mnt = mnt, .dentry = dentry };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) inode_unlock(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) err = ovl_workdir_cleanup_recurse(&path, level + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) inode_lock_nested(dir, I_MUTEX_PARENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) err = ovl_cleanup(dir, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) int ovl_indexdir_cleanup(struct ovl_fs *ofs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) struct dentry *indexdir = ofs->indexdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) struct dentry *index = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) struct inode *dir = indexdir->d_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) struct path path = { .mnt = ovl_upper_mnt(ofs), .dentry = indexdir };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) LIST_HEAD(list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) struct rb_root root = RB_ROOT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) struct ovl_cache_entry *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) struct ovl_readdir_data rdd = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) .ctx.actor = ovl_fill_merge,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) .dentry = NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) .list = &list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) .root = &root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) .is_lowest = false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) err = ovl_dir_read(&path, &rdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) inode_lock_nested(dir, I_MUTEX_PARENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) list_for_each_entry(p, &list, l_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) if (p->name[0] == '.') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) if (p->len == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) if (p->len == 2 && p->name[1] == '.')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) index = lookup_one_len(p->name, indexdir, p->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) if (IS_ERR(index)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) err = PTR_ERR(index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) index = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) /* Cleanup leftover from index create/cleanup attempt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) if (index->d_name.name[0] == '#') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) err = ovl_workdir_cleanup(dir, path.mnt, index, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) err = ovl_verify_index(ofs, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) } else if (err == -ESTALE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) /* Cleanup stale index entries */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) err = ovl_cleanup(dir, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) } else if (err != -ENOENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) * Abort mount to avoid corrupting the index if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) * an incompatible index entry was found or on out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) * of memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) } else if (ofs->config.nfs_export) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) * Whiteout orphan index to block future open by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) * handle after overlay nlink dropped to zero.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) err = ovl_cleanup_and_whiteout(ofs, dir, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) /* Cleanup orphan index entries */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) err = ovl_cleanup(dir, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) next:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) dput(index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) index = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) dput(index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) inode_unlock(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) ovl_cache_free(&list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) pr_err("failed index dir cleanup (%i)\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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