123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944945946947948949950951952953954955956957958959960961962963964965966967968969970971972973974975976977978979980981982983984985986987988989990991992993994995996997998999100010011002100310041005100610071008100910101011101210131014101510161017101810191020102110221023102410251026102710281029103010311032103310341035103610371038103910401041104210431044104510461047104810491050105110521053105410551056105710581059106010611062106310641065106610671068106910701071107210731074107510761077107810791080108110821083108410851086108710881089109010911092109310941095109610971098109911001101110211031104110511061107110811091110111111121113111411151116111711181119112011211122112311241125112611271128112911301131113211331134113511361137113811391140114111421143114411451146114711481149115011511152115311541155115611571158115911601161116211631164116511661167116811691170117111721173117411751176117711781179118011811182118311841185118611871188118911901191119211931194119511961197119811991200120112021203120412051206120712081209121012111212121312141215121612171218121912201221122212231224122512261227122812291230123112321233123412351236123712381239124012411242124312441245124612471248124912501251125212531254125512561257125812591260126112621263126412651266126712681269127012711272127312741275127612771278127912801281128212831284128512861287128812891290129112921293129412951296129712981299130013011302130313041305130613071308130913101311131213131314131513161317131813191320132113221323132413251326132713281329133013311332133313341335133613371338133913401341134213431344134513461347134813491350135113521353135413551356135713581359136013611362136313641365136613671368136913701371137213731374137513761377137813791380138113821383138413851386138713881389139013911392139313941395139613971398139914001401140214031404140514061407140814091410141114121413141414151416141714181419142014211422142314241425142614271428142914301431143214331434143514361437143814391440144114421443144414451446144714481449145014511452145314541455145614571458145914601461146214631464146514661467146814691470147114721473147414751476147714781479148014811482148314841485148614871488148914901491149214931494149514961497149814991500150115021503150415051506150715081509151015111512151315141515151615171518151915201521152215231524152515261527152815291530153115321533153415351536153715381539154015411542154315441545154615471548154915501551155215531554155515561557155815591560156115621563156415651566156715681569157015711572157315741575157615771578157915801581158215831584158515861587158815891590159115921593159415951596159715981599160016011602160316041605160616071608160916101611161216131614161516161617161816191620162116221623162416251626162716281629163016311632163316341635163616371638163916401641164216431644164516461647164816491650165116521653165416551656165716581659166016611662166316641665166616671668166916701671 |
- // SPDX-License-Identifier: GPL-2.0-only
- /* * This file is part of UBIFS.
- *
- * Copyright (C) 2006-2008 Nokia Corporation.
- * Copyright (C) 2006, 2007 University of Szeged, Hungary
- *
- * Authors: Artem Bityutskiy (Битюцкий Артём)
- * Adrian Hunter
- * Zoltan Sogor
- */
- /*
- * This file implements directory operations.
- *
- * All FS operations in this file allocate budget before writing anything to the
- * media. If they fail to allocate it, the error is returned. The only
- * exceptions are 'ubifs_unlink()' and 'ubifs_rmdir()' which keep working even
- * if they unable to allocate the budget, because deletion %-ENOSPC failure is
- * not what users are usually ready to get. UBIFS budgeting subsystem has some
- * space reserved for these purposes.
- *
- * All operations in this file write all inodes which they change straight
- * away, instead of marking them dirty. For example, 'ubifs_link()' changes
- * @i_size of the parent inode and writes the parent inode together with the
- * target inode. This was done to simplify file-system recovery which would
- * otherwise be very difficult to do. The only exception is rename which marks
- * the re-named inode dirty (because its @i_ctime is updated) but does not
- * write it, but just marks it as dirty.
- */
- #include "ubifs.h"
- /**
- * inherit_flags - inherit flags of the parent inode.
- * @dir: parent inode
- * @mode: new inode mode flags
- *
- * This is a helper function for 'ubifs_new_inode()' which inherits flag of the
- * parent directory inode @dir. UBIFS inodes inherit the following flags:
- * o %UBIFS_COMPR_FL, which is useful to switch compression on/of on
- * sub-directory basis;
- * o %UBIFS_SYNC_FL - useful for the same reasons;
- * o %UBIFS_DIRSYNC_FL - similar, but relevant only to directories.
- *
- * This function returns the inherited flags.
- */
- static int inherit_flags(const struct inode *dir, umode_t mode)
- {
- int flags;
- const struct ubifs_inode *ui = ubifs_inode(dir);
- if (!S_ISDIR(dir->i_mode))
- /*
- * The parent is not a directory, which means that an extended
- * attribute inode is being created. No flags.
- */
- return 0;
- flags = ui->flags & (UBIFS_COMPR_FL | UBIFS_SYNC_FL | UBIFS_DIRSYNC_FL);
- if (!S_ISDIR(mode))
- /* The "DIRSYNC" flag only applies to directories */
- flags &= ~UBIFS_DIRSYNC_FL;
- return flags;
- }
- /**
- * ubifs_new_inode - allocate new UBIFS inode object.
- * @c: UBIFS file-system description object
- * @dir: parent directory inode
- * @mode: inode mode flags
- *
- * This function finds an unused inode number, allocates new inode and
- * initializes it. Returns new inode in case of success and an error code in
- * case of failure.
- */
- struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir,
- umode_t mode)
- {
- int err;
- struct inode *inode;
- struct ubifs_inode *ui;
- bool encrypted = false;
- inode = new_inode(c->vfs_sb);
- ui = ubifs_inode(inode);
- if (!inode)
- return ERR_PTR(-ENOMEM);
- /*
- * Set 'S_NOCMTIME' to prevent VFS form updating [mc]time of inodes and
- * marking them dirty in file write path (see 'file_update_time()').
- * UBIFS has to fully control "clean <-> dirty" transitions of inodes
- * to make budgeting work.
- */
- inode->i_flags |= S_NOCMTIME;
- inode_init_owner(inode, dir, mode);
- inode->i_mtime = inode->i_atime = inode->i_ctime =
- current_time(inode);
- inode->i_mapping->nrpages = 0;
- err = fscrypt_prepare_new_inode(dir, inode, &encrypted);
- if (err) {
- ubifs_err(c, "fscrypt_prepare_new_inode failed: %i", err);
- goto out_iput;
- }
- switch (mode & S_IFMT) {
- case S_IFREG:
- inode->i_mapping->a_ops = &ubifs_file_address_operations;
- inode->i_op = &ubifs_file_inode_operations;
- inode->i_fop = &ubifs_file_operations;
- break;
- case S_IFDIR:
- inode->i_op = &ubifs_dir_inode_operations;
- inode->i_fop = &ubifs_dir_operations;
- inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ;
- break;
- case S_IFLNK:
- inode->i_op = &ubifs_symlink_inode_operations;
- break;
- case S_IFSOCK:
- case S_IFIFO:
- case S_IFBLK:
- case S_IFCHR:
- inode->i_op = &ubifs_file_inode_operations;
- break;
- default:
- BUG();
- }
- ui->flags = inherit_flags(dir, mode);
- ubifs_set_inode_flags(inode);
- if (S_ISREG(mode))
- ui->compr_type = c->default_compr;
- else
- ui->compr_type = UBIFS_COMPR_NONE;
- ui->synced_i_size = 0;
- spin_lock(&c->cnt_lock);
- /* Inode number overflow is currently not supported */
- if (c->highest_inum >= INUM_WARN_WATERMARK) {
- if (c->highest_inum >= INUM_WATERMARK) {
- spin_unlock(&c->cnt_lock);
- ubifs_err(c, "out of inode numbers");
- err = -EINVAL;
- goto out_iput;
- }
- ubifs_warn(c, "running out of inode numbers (current %lu, max %u)",
- (unsigned long)c->highest_inum, INUM_WATERMARK);
- }
- inode->i_ino = ++c->highest_inum;
- /*
- * The creation sequence number remains with this inode for its
- * lifetime. All nodes for this inode have a greater sequence number,
- * and so it is possible to distinguish obsolete nodes belonging to a
- * previous incarnation of the same inode number - for example, for the
- * purpose of rebuilding the index.
- */
- ui->creat_sqnum = ++c->max_sqnum;
- spin_unlock(&c->cnt_lock);
- if (encrypted) {
- err = fscrypt_set_context(inode, NULL);
- if (err) {
- ubifs_err(c, "fscrypt_set_context failed: %i", err);
- goto out_iput;
- }
- }
- return inode;
- out_iput:
- make_bad_inode(inode);
- iput(inode);
- return ERR_PTR(err);
- }
- static int dbg_check_name(const struct ubifs_info *c,
- const struct ubifs_dent_node *dent,
- const struct fscrypt_name *nm)
- {
- if (!dbg_is_chk_gen(c))
- return 0;
- if (le16_to_cpu(dent->nlen) != fname_len(nm))
- return -EINVAL;
- if (memcmp(dent->name, fname_name(nm), fname_len(nm)))
- return -EINVAL;
- return 0;
- }
- static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
- unsigned int flags)
- {
- int err;
- union ubifs_key key;
- struct inode *inode = NULL;
- struct ubifs_dent_node *dent = NULL;
- struct ubifs_info *c = dir->i_sb->s_fs_info;
- struct fscrypt_name nm;
- dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino);
- err = fscrypt_prepare_lookup(dir, dentry, &nm);
- generic_set_encrypted_ci_d_ops(dentry);
- if (err == -ENOENT)
- return d_splice_alias(NULL, dentry);
- if (err)
- return ERR_PTR(err);
- if (fname_len(&nm) > UBIFS_MAX_NLEN) {
- inode = ERR_PTR(-ENAMETOOLONG);
- goto done;
- }
- dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
- if (!dent) {
- inode = ERR_PTR(-ENOMEM);
- goto done;
- }
- if (fname_name(&nm) == NULL) {
- if (nm.hash & ~UBIFS_S_KEY_HASH_MASK)
- goto done; /* ENOENT */
- dent_key_init_hash(c, &key, dir->i_ino, nm.hash);
- err = ubifs_tnc_lookup_dh(c, &key, dent, nm.minor_hash);
- } else {
- dent_key_init(c, &key, dir->i_ino, &nm);
- err = ubifs_tnc_lookup_nm(c, &key, dent, &nm);
- }
- if (err) {
- if (err == -ENOENT)
- dbg_gen("not found");
- else
- inode = ERR_PTR(err);
- goto done;
- }
- if (dbg_check_name(c, dent, &nm)) {
- inode = ERR_PTR(-EINVAL);
- goto done;
- }
- inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum));
- if (IS_ERR(inode)) {
- /*
- * This should not happen. Probably the file-system needs
- * checking.
- */
- err = PTR_ERR(inode);
- ubifs_err(c, "dead directory entry '%pd', error %d",
- dentry, err);
- ubifs_ro_mode(c, err);
- goto done;
- }
- if (IS_ENCRYPTED(dir) &&
- (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
- !fscrypt_has_permitted_context(dir, inode)) {
- ubifs_warn(c, "Inconsistent encryption contexts: %lu/%lu",
- dir->i_ino, inode->i_ino);
- iput(inode);
- inode = ERR_PTR(-EPERM);
- }
- done:
- kfree(dent);
- fscrypt_free_filename(&nm);
- return d_splice_alias(inode, dentry);
- }
- static int ubifs_prepare_create(struct inode *dir, struct dentry *dentry,
- struct fscrypt_name *nm)
- {
- if (fscrypt_is_nokey_name(dentry))
- return -ENOKEY;
- return fscrypt_setup_filename(dir, &dentry->d_name, 0, nm);
- }
- static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
- bool excl)
- {
- struct inode *inode;
- struct ubifs_info *c = dir->i_sb->s_fs_info;
- struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
- .dirtied_ino = 1 };
- struct ubifs_inode *dir_ui = ubifs_inode(dir);
- struct fscrypt_name nm;
- int err, sz_change;
- /*
- * Budget request settings: new inode, new direntry, changing the
- * parent directory inode.
- */
- dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
- dentry, mode, dir->i_ino);
- err = ubifs_budget_space(c, &req);
- if (err)
- return err;
- err = ubifs_prepare_create(dir, dentry, &nm);
- if (err)
- goto out_budg;
- sz_change = CALC_DENT_SIZE(fname_len(&nm));
- inode = ubifs_new_inode(c, dir, mode);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- goto out_fname;
- }
- err = ubifs_init_security(dir, inode, &dentry->d_name);
- if (err)
- goto out_inode;
- mutex_lock(&dir_ui->ui_mutex);
- dir->i_size += sz_change;
- dir_ui->ui_size = dir->i_size;
- dir->i_mtime = dir->i_ctime = inode->i_ctime;
- err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
- if (err)
- goto out_cancel;
- mutex_unlock(&dir_ui->ui_mutex);
- ubifs_release_budget(c, &req);
- fscrypt_free_filename(&nm);
- insert_inode_hash(inode);
- d_instantiate(dentry, inode);
- return 0;
- out_cancel:
- dir->i_size -= sz_change;
- dir_ui->ui_size = dir->i_size;
- mutex_unlock(&dir_ui->ui_mutex);
- out_inode:
- make_bad_inode(inode);
- iput(inode);
- out_fname:
- fscrypt_free_filename(&nm);
- out_budg:
- ubifs_release_budget(c, &req);
- ubifs_err(c, "cannot create regular file, error %d", err);
- return err;
- }
- static int do_tmpfile(struct inode *dir, struct dentry *dentry,
- umode_t mode, struct inode **whiteout)
- {
- struct inode *inode;
- struct ubifs_info *c = dir->i_sb->s_fs_info;
- struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
- .dirtied_ino = 1};
- struct ubifs_budget_req ino_req = { .dirtied_ino = 1 };
- struct ubifs_inode *ui, *dir_ui = ubifs_inode(dir);
- int err, instantiated = 0;
- struct fscrypt_name nm;
- /*
- * Budget request settings: new inode, new direntry, changing the
- * parent directory inode.
- * Allocate budget separately for new dirtied inode, the budget will
- * be released via writeback.
- */
- dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
- dentry, mode, dir->i_ino);
- err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
- if (err)
- return err;
- err = ubifs_budget_space(c, &req);
- if (err) {
- fscrypt_free_filename(&nm);
- return err;
- }
- err = ubifs_budget_space(c, &ino_req);
- if (err) {
- ubifs_release_budget(c, &req);
- fscrypt_free_filename(&nm);
- return err;
- }
- inode = ubifs_new_inode(c, dir, mode);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- goto out_budg;
- }
- ui = ubifs_inode(inode);
- if (whiteout) {
- init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
- ubifs_assert(c, inode->i_op == &ubifs_file_inode_operations);
- }
- err = ubifs_init_security(dir, inode, &dentry->d_name);
- if (err)
- goto out_inode;
- mutex_lock(&ui->ui_mutex);
- insert_inode_hash(inode);
- if (whiteout) {
- mark_inode_dirty(inode);
- drop_nlink(inode);
- *whiteout = inode;
- } else {
- d_tmpfile(dentry, inode);
- }
- ubifs_assert(c, ui->dirty);
- instantiated = 1;
- mutex_unlock(&ui->ui_mutex);
- mutex_lock(&dir_ui->ui_mutex);
- err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
- if (err)
- goto out_cancel;
- mutex_unlock(&dir_ui->ui_mutex);
- ubifs_release_budget(c, &req);
- return 0;
- out_cancel:
- mutex_unlock(&dir_ui->ui_mutex);
- out_inode:
- make_bad_inode(inode);
- if (!instantiated)
- iput(inode);
- else if (whiteout)
- iput(*whiteout);
- out_budg:
- ubifs_release_budget(c, &req);
- if (!instantiated)
- ubifs_release_budget(c, &ino_req);
- fscrypt_free_filename(&nm);
- ubifs_err(c, "cannot create temporary file, error %d", err);
- return err;
- }
- static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry,
- umode_t mode)
- {
- return do_tmpfile(dir, dentry, mode, NULL);
- }
- /**
- * vfs_dent_type - get VFS directory entry type.
- * @type: UBIFS directory entry type
- *
- * This function converts UBIFS directory entry type into VFS directory entry
- * type.
- */
- static unsigned int vfs_dent_type(uint8_t type)
- {
- switch (type) {
- case UBIFS_ITYPE_REG:
- return DT_REG;
- case UBIFS_ITYPE_DIR:
- return DT_DIR;
- case UBIFS_ITYPE_LNK:
- return DT_LNK;
- case UBIFS_ITYPE_BLK:
- return DT_BLK;
- case UBIFS_ITYPE_CHR:
- return DT_CHR;
- case UBIFS_ITYPE_FIFO:
- return DT_FIFO;
- case UBIFS_ITYPE_SOCK:
- return DT_SOCK;
- default:
- BUG();
- }
- return 0;
- }
- /*
- * The classical Unix view for directory is that it is a linear array of
- * (name, inode number) entries. Linux/VFS assumes this model as well.
- * Particularly, 'readdir()' call wants us to return a directory entry offset
- * which later may be used to continue 'readdir()'ing the directory or to
- * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this
- * model because directory entries are identified by keys, which may collide.
- *
- * UBIFS uses directory entry hash value for directory offsets, so
- * 'seekdir()'/'telldir()' may not always work because of possible key
- * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work
- * properly by means of saving full directory entry name in the private field
- * of the file description object.
- *
- * This means that UBIFS cannot support NFS which requires full
- * 'seekdir()'/'telldir()' support.
- */
- static int ubifs_readdir(struct file *file, struct dir_context *ctx)
- {
- int fstr_real_len = 0, err = 0;
- struct fscrypt_name nm;
- struct fscrypt_str fstr = {0};
- union ubifs_key key;
- struct ubifs_dent_node *dent;
- struct inode *dir = file_inode(file);
- struct ubifs_info *c = dir->i_sb->s_fs_info;
- bool encrypted = IS_ENCRYPTED(dir);
- dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos);
- if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2)
- /*
- * The directory was seek'ed to a senseless position or there
- * are no more entries.
- */
- return 0;
- if (encrypted) {
- err = fscrypt_prepare_readdir(dir);
- if (err)
- return err;
- err = fscrypt_fname_alloc_buffer(UBIFS_MAX_NLEN, &fstr);
- if (err)
- return err;
- fstr_real_len = fstr.len;
- }
- if (file->f_version == 0) {
- /*
- * The file was seek'ed, which means that @file->private_data
- * is now invalid. This may also be just the first
- * 'ubifs_readdir()' invocation, in which case
- * @file->private_data is NULL, and the below code is
- * basically a no-op.
- */
- kfree(file->private_data);
- file->private_data = NULL;
- }
- /*
- * 'generic_file_llseek()' unconditionally sets @file->f_version to
- * zero, and we use this for detecting whether the file was seek'ed.
- */
- file->f_version = 1;
- /* File positions 0 and 1 correspond to "." and ".." */
- if (ctx->pos < 2) {
- ubifs_assert(c, !file->private_data);
- if (!dir_emit_dots(file, ctx)) {
- if (encrypted)
- fscrypt_fname_free_buffer(&fstr);
- return 0;
- }
- /* Find the first entry in TNC and save it */
- lowest_dent_key(c, &key, dir->i_ino);
- fname_len(&nm) = 0;
- dent = ubifs_tnc_next_ent(c, &key, &nm);
- if (IS_ERR(dent)) {
- err = PTR_ERR(dent);
- goto out;
- }
- ctx->pos = key_hash_flash(c, &dent->key);
- file->private_data = dent;
- }
- dent = file->private_data;
- if (!dent) {
- /*
- * The directory was seek'ed to and is now readdir'ed.
- * Find the entry corresponding to @ctx->pos or the closest one.
- */
- dent_key_init_hash(c, &key, dir->i_ino, ctx->pos);
- fname_len(&nm) = 0;
- dent = ubifs_tnc_next_ent(c, &key, &nm);
- if (IS_ERR(dent)) {
- err = PTR_ERR(dent);
- goto out;
- }
- ctx->pos = key_hash_flash(c, &dent->key);
- file->private_data = dent;
- }
- while (1) {
- dbg_gen("ino %llu, new f_pos %#x",
- (unsigned long long)le64_to_cpu(dent->inum),
- key_hash_flash(c, &dent->key));
- ubifs_assert(c, le64_to_cpu(dent->ch.sqnum) >
- ubifs_inode(dir)->creat_sqnum);
- fname_len(&nm) = le16_to_cpu(dent->nlen);
- fname_name(&nm) = dent->name;
- if (encrypted) {
- fstr.len = fstr_real_len;
- err = fscrypt_fname_disk_to_usr(dir, key_hash_flash(c,
- &dent->key),
- le32_to_cpu(dent->cookie),
- &nm.disk_name, &fstr);
- if (err)
- goto out;
- } else {
- fstr.len = fname_len(&nm);
- fstr.name = fname_name(&nm);
- }
- if (!dir_emit(ctx, fstr.name, fstr.len,
- le64_to_cpu(dent->inum),
- vfs_dent_type(dent->type))) {
- if (encrypted)
- fscrypt_fname_free_buffer(&fstr);
- return 0;
- }
- /* Switch to the next entry */
- key_read(c, &dent->key, &key);
- dent = ubifs_tnc_next_ent(c, &key, &nm);
- if (IS_ERR(dent)) {
- err = PTR_ERR(dent);
- goto out;
- }
- kfree(file->private_data);
- ctx->pos = key_hash_flash(c, &dent->key);
- file->private_data = dent;
- cond_resched();
- }
- out:
- kfree(file->private_data);
- file->private_data = NULL;
- if (encrypted)
- fscrypt_fname_free_buffer(&fstr);
- if (err != -ENOENT)
- ubifs_err(c, "cannot find next direntry, error %d", err);
- else
- /*
- * -ENOENT is a non-fatal error in this context, the TNC uses
- * it to indicate that the cursor moved past the current directory
- * and readdir() has to stop.
- */
- err = 0;
- /* 2 is a special value indicating that there are no more direntries */
- ctx->pos = 2;
- return err;
- }
- /* Free saved readdir() state when the directory is closed */
- static int ubifs_dir_release(struct inode *dir, struct file *file)
- {
- kfree(file->private_data);
- file->private_data = NULL;
- return 0;
- }
- /**
- * lock_2_inodes - a wrapper for locking two UBIFS inodes.
- * @inode1: first inode
- * @inode2: second inode
- *
- * We do not implement any tricks to guarantee strict lock ordering, because
- * VFS has already done it for us on the @i_mutex. So this is just a simple
- * wrapper function.
- */
- static void lock_2_inodes(struct inode *inode1, struct inode *inode2)
- {
- mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
- mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
- }
- /**
- * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes.
- * @inode1: first inode
- * @inode2: second inode
- */
- static void unlock_2_inodes(struct inode *inode1, struct inode *inode2)
- {
- mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
- mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
- }
- static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
- struct dentry *dentry)
- {
- struct ubifs_info *c = dir->i_sb->s_fs_info;
- struct inode *inode = d_inode(old_dentry);
- struct ubifs_inode *ui = ubifs_inode(inode);
- struct ubifs_inode *dir_ui = ubifs_inode(dir);
- int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
- struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2,
- .dirtied_ino_d = ALIGN(ui->data_len, 8) };
- struct fscrypt_name nm;
- /*
- * Budget request settings: new direntry, changing the target inode,
- * changing the parent inode.
- */
- dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu",
- dentry, inode->i_ino,
- inode->i_nlink, dir->i_ino);
- ubifs_assert(c, inode_is_locked(dir));
- ubifs_assert(c, inode_is_locked(inode));
- err = fscrypt_prepare_link(old_dentry, dir, dentry);
- if (err)
- return err;
- err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
- if (err)
- return err;
- err = dbg_check_synced_i_size(c, inode);
- if (err)
- goto out_fname;
- err = ubifs_budget_space(c, &req);
- if (err)
- goto out_fname;
- lock_2_inodes(dir, inode);
- /* Handle O_TMPFILE corner case, it is allowed to link a O_TMPFILE. */
- if (inode->i_nlink == 0)
- ubifs_delete_orphan(c, inode->i_ino);
- inc_nlink(inode);
- ihold(inode);
- inode->i_ctime = current_time(inode);
- dir->i_size += sz_change;
- dir_ui->ui_size = dir->i_size;
- dir->i_mtime = dir->i_ctime = inode->i_ctime;
- err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
- if (err)
- goto out_cancel;
- unlock_2_inodes(dir, inode);
- ubifs_release_budget(c, &req);
- d_instantiate(dentry, inode);
- fscrypt_free_filename(&nm);
- return 0;
- out_cancel:
- dir->i_size -= sz_change;
- dir_ui->ui_size = dir->i_size;
- drop_nlink(inode);
- if (inode->i_nlink == 0)
- ubifs_add_orphan(c, inode->i_ino);
- unlock_2_inodes(dir, inode);
- ubifs_release_budget(c, &req);
- iput(inode);
- out_fname:
- fscrypt_free_filename(&nm);
- return err;
- }
- static int ubifs_unlink(struct inode *dir, struct dentry *dentry)
- {
- struct ubifs_info *c = dir->i_sb->s_fs_info;
- struct inode *inode = d_inode(dentry);
- struct ubifs_inode *dir_ui = ubifs_inode(dir);
- int err, sz_change, budgeted = 1;
- struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
- unsigned int saved_nlink = inode->i_nlink;
- struct fscrypt_name nm;
- /*
- * Budget request settings: deletion direntry, deletion inode (+1 for
- * @dirtied_ino), changing the parent directory inode. If budgeting
- * fails, go ahead anyway because we have extra space reserved for
- * deletions.
- */
- dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu",
- dentry, inode->i_ino,
- inode->i_nlink, dir->i_ino);
- err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
- if (err)
- return err;
- err = ubifs_purge_xattrs(inode);
- if (err)
- return err;
- sz_change = CALC_DENT_SIZE(fname_len(&nm));
- ubifs_assert(c, inode_is_locked(dir));
- ubifs_assert(c, inode_is_locked(inode));
- err = dbg_check_synced_i_size(c, inode);
- if (err)
- goto out_fname;
- err = ubifs_budget_space(c, &req);
- if (err) {
- if (err != -ENOSPC)
- goto out_fname;
- budgeted = 0;
- }
- lock_2_inodes(dir, inode);
- inode->i_ctime = current_time(dir);
- drop_nlink(inode);
- dir->i_size -= sz_change;
- dir_ui->ui_size = dir->i_size;
- dir->i_mtime = dir->i_ctime = inode->i_ctime;
- err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
- if (err)
- goto out_cancel;
- unlock_2_inodes(dir, inode);
- if (budgeted)
- ubifs_release_budget(c, &req);
- else {
- /* We've deleted something - clean the "no space" flags */
- c->bi.nospace = c->bi.nospace_rp = 0;
- smp_wmb();
- }
- fscrypt_free_filename(&nm);
- return 0;
- out_cancel:
- dir->i_size += sz_change;
- dir_ui->ui_size = dir->i_size;
- set_nlink(inode, saved_nlink);
- unlock_2_inodes(dir, inode);
- if (budgeted)
- ubifs_release_budget(c, &req);
- out_fname:
- fscrypt_free_filename(&nm);
- return err;
- }
- /**
- * check_dir_empty - check if a directory is empty or not.
- * @dir: VFS inode object of the directory to check
- *
- * This function checks if directory @dir is empty. Returns zero if the
- * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes
- * in case of of errors.
- */
- int ubifs_check_dir_empty(struct inode *dir)
- {
- struct ubifs_info *c = dir->i_sb->s_fs_info;
- struct fscrypt_name nm = { 0 };
- struct ubifs_dent_node *dent;
- union ubifs_key key;
- int err;
- lowest_dent_key(c, &key, dir->i_ino);
- dent = ubifs_tnc_next_ent(c, &key, &nm);
- if (IS_ERR(dent)) {
- err = PTR_ERR(dent);
- if (err == -ENOENT)
- err = 0;
- } else {
- kfree(dent);
- err = -ENOTEMPTY;
- }
- return err;
- }
- static int ubifs_rmdir(struct inode *dir, struct dentry *dentry)
- {
- struct ubifs_info *c = dir->i_sb->s_fs_info;
- struct inode *inode = d_inode(dentry);
- int err, sz_change, budgeted = 1;
- struct ubifs_inode *dir_ui = ubifs_inode(dir);
- struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
- struct fscrypt_name nm;
- /*
- * Budget request settings: deletion direntry, deletion inode and
- * changing the parent inode. If budgeting fails, go ahead anyway
- * because we have extra space reserved for deletions.
- */
- dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry,
- inode->i_ino, dir->i_ino);
- ubifs_assert(c, inode_is_locked(dir));
- ubifs_assert(c, inode_is_locked(inode));
- err = ubifs_check_dir_empty(d_inode(dentry));
- if (err)
- return err;
- err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
- if (err)
- return err;
- err = ubifs_purge_xattrs(inode);
- if (err)
- return err;
- sz_change = CALC_DENT_SIZE(fname_len(&nm));
- err = ubifs_budget_space(c, &req);
- if (err) {
- if (err != -ENOSPC)
- goto out_fname;
- budgeted = 0;
- }
- lock_2_inodes(dir, inode);
- inode->i_ctime = current_time(dir);
- clear_nlink(inode);
- drop_nlink(dir);
- dir->i_size -= sz_change;
- dir_ui->ui_size = dir->i_size;
- dir->i_mtime = dir->i_ctime = inode->i_ctime;
- err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
- if (err)
- goto out_cancel;
- unlock_2_inodes(dir, inode);
- if (budgeted)
- ubifs_release_budget(c, &req);
- else {
- /* We've deleted something - clean the "no space" flags */
- c->bi.nospace = c->bi.nospace_rp = 0;
- smp_wmb();
- }
- fscrypt_free_filename(&nm);
- return 0;
- out_cancel:
- dir->i_size += sz_change;
- dir_ui->ui_size = dir->i_size;
- inc_nlink(dir);
- set_nlink(inode, 2);
- unlock_2_inodes(dir, inode);
- if (budgeted)
- ubifs_release_budget(c, &req);
- out_fname:
- fscrypt_free_filename(&nm);
- return err;
- }
- static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
- {
- struct inode *inode;
- struct ubifs_inode *dir_ui = ubifs_inode(dir);
- struct ubifs_info *c = dir->i_sb->s_fs_info;
- int err, sz_change;
- struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
- .dirtied_ino = 1};
- struct fscrypt_name nm;
- /*
- * Budget request settings: new inode, new direntry and changing parent
- * directory inode.
- */
- dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
- dentry, mode, dir->i_ino);
- err = ubifs_budget_space(c, &req);
- if (err)
- return err;
- err = ubifs_prepare_create(dir, dentry, &nm);
- if (err)
- goto out_budg;
- sz_change = CALC_DENT_SIZE(fname_len(&nm));
- inode = ubifs_new_inode(c, dir, S_IFDIR | mode);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- goto out_fname;
- }
- err = ubifs_init_security(dir, inode, &dentry->d_name);
- if (err)
- goto out_inode;
- mutex_lock(&dir_ui->ui_mutex);
- insert_inode_hash(inode);
- inc_nlink(inode);
- inc_nlink(dir);
- dir->i_size += sz_change;
- dir_ui->ui_size = dir->i_size;
- dir->i_mtime = dir->i_ctime = inode->i_ctime;
- err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
- if (err) {
- ubifs_err(c, "cannot create directory, error %d", err);
- goto out_cancel;
- }
- mutex_unlock(&dir_ui->ui_mutex);
- ubifs_release_budget(c, &req);
- d_instantiate(dentry, inode);
- fscrypt_free_filename(&nm);
- return 0;
- out_cancel:
- dir->i_size -= sz_change;
- dir_ui->ui_size = dir->i_size;
- drop_nlink(dir);
- mutex_unlock(&dir_ui->ui_mutex);
- out_inode:
- make_bad_inode(inode);
- iput(inode);
- out_fname:
- fscrypt_free_filename(&nm);
- out_budg:
- ubifs_release_budget(c, &req);
- return err;
- }
- static int ubifs_mknod(struct inode *dir, struct dentry *dentry,
- umode_t mode, dev_t rdev)
- {
- struct inode *inode;
- struct ubifs_inode *ui;
- struct ubifs_inode *dir_ui = ubifs_inode(dir);
- struct ubifs_info *c = dir->i_sb->s_fs_info;
- union ubifs_dev_desc *dev = NULL;
- int sz_change;
- int err, devlen = 0;
- struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
- .dirtied_ino = 1 };
- struct fscrypt_name nm;
- /*
- * Budget request settings: new inode, new direntry and changing parent
- * directory inode.
- */
- dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino);
- if (S_ISBLK(mode) || S_ISCHR(mode)) {
- dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
- if (!dev)
- return -ENOMEM;
- devlen = ubifs_encode_dev(dev, rdev);
- }
- req.new_ino_d = ALIGN(devlen, 8);
- err = ubifs_budget_space(c, &req);
- if (err) {
- kfree(dev);
- return err;
- }
- err = ubifs_prepare_create(dir, dentry, &nm);
- if (err) {
- kfree(dev);
- goto out_budg;
- }
- sz_change = CALC_DENT_SIZE(fname_len(&nm));
- inode = ubifs_new_inode(c, dir, mode);
- if (IS_ERR(inode)) {
- kfree(dev);
- err = PTR_ERR(inode);
- goto out_fname;
- }
- init_special_inode(inode, inode->i_mode, rdev);
- inode->i_size = ubifs_inode(inode)->ui_size = devlen;
- ui = ubifs_inode(inode);
- ui->data = dev;
- ui->data_len = devlen;
- err = ubifs_init_security(dir, inode, &dentry->d_name);
- if (err)
- goto out_inode;
- mutex_lock(&dir_ui->ui_mutex);
- dir->i_size += sz_change;
- dir_ui->ui_size = dir->i_size;
- dir->i_mtime = dir->i_ctime = inode->i_ctime;
- err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
- if (err)
- goto out_cancel;
- mutex_unlock(&dir_ui->ui_mutex);
- ubifs_release_budget(c, &req);
- insert_inode_hash(inode);
- d_instantiate(dentry, inode);
- fscrypt_free_filename(&nm);
- return 0;
- out_cancel:
- dir->i_size -= sz_change;
- dir_ui->ui_size = dir->i_size;
- mutex_unlock(&dir_ui->ui_mutex);
- out_inode:
- make_bad_inode(inode);
- iput(inode);
- out_fname:
- fscrypt_free_filename(&nm);
- out_budg:
- ubifs_release_budget(c, &req);
- return err;
- }
- static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
- const char *symname)
- {
- struct inode *inode;
- struct ubifs_inode *ui;
- struct ubifs_inode *dir_ui = ubifs_inode(dir);
- struct ubifs_info *c = dir->i_sb->s_fs_info;
- int err, sz_change, len = strlen(symname);
- struct fscrypt_str disk_link;
- struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
- .new_ino_d = ALIGN(len, 8),
- .dirtied_ino = 1 };
- struct fscrypt_name nm;
- dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry,
- symname, dir->i_ino);
- err = fscrypt_prepare_symlink(dir, symname, len, UBIFS_MAX_INO_DATA,
- &disk_link);
- if (err)
- return err;
- /*
- * Budget request settings: new inode, new direntry and changing parent
- * directory inode.
- */
- err = ubifs_budget_space(c, &req);
- if (err)
- return err;
- err = ubifs_prepare_create(dir, dentry, &nm);
- if (err)
- goto out_budg;
- sz_change = CALC_DENT_SIZE(fname_len(&nm));
- inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- goto out_fname;
- }
- ui = ubifs_inode(inode);
- ui->data = kmalloc(disk_link.len, GFP_NOFS);
- if (!ui->data) {
- err = -ENOMEM;
- goto out_inode;
- }
- if (IS_ENCRYPTED(inode)) {
- disk_link.name = ui->data; /* encrypt directly into ui->data */
- err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
- if (err)
- goto out_inode;
- } else {
- memcpy(ui->data, disk_link.name, disk_link.len);
- inode->i_link = ui->data;
- }
- /*
- * The terminating zero byte is not written to the flash media and it
- * is put just to make later in-memory string processing simpler. Thus,
- * data length is @disk_link.len - 1, not @disk_link.len.
- */
- ui->data_len = disk_link.len - 1;
- inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1;
- err = ubifs_init_security(dir, inode, &dentry->d_name);
- if (err)
- goto out_inode;
- mutex_lock(&dir_ui->ui_mutex);
- dir->i_size += sz_change;
- dir_ui->ui_size = dir->i_size;
- dir->i_mtime = dir->i_ctime = inode->i_ctime;
- err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
- if (err)
- goto out_cancel;
- mutex_unlock(&dir_ui->ui_mutex);
- insert_inode_hash(inode);
- d_instantiate(dentry, inode);
- err = 0;
- goto out_fname;
- out_cancel:
- dir->i_size -= sz_change;
- dir_ui->ui_size = dir->i_size;
- mutex_unlock(&dir_ui->ui_mutex);
- out_inode:
- make_bad_inode(inode);
- iput(inode);
- out_fname:
- fscrypt_free_filename(&nm);
- out_budg:
- ubifs_release_budget(c, &req);
- return err;
- }
- /**
- * lock_4_inodes - a wrapper for locking three UBIFS inodes.
- * @inode1: first inode
- * @inode2: second inode
- * @inode3: third inode
- * @inode4: fouth inode
- *
- * This function is used for 'ubifs_rename()' and @inode1 may be the same as
- * @inode2 whereas @inode3 and @inode4 may be %NULL.
- *
- * We do not implement any tricks to guarantee strict lock ordering, because
- * VFS has already done it for us on the @i_mutex. So this is just a simple
- * wrapper function.
- */
- static void lock_4_inodes(struct inode *inode1, struct inode *inode2,
- struct inode *inode3, struct inode *inode4)
- {
- mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
- if (inode2 != inode1)
- mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
- if (inode3)
- mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3);
- if (inode4)
- mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4);
- }
- /**
- * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename.
- * @inode1: first inode
- * @inode2: second inode
- * @inode3: third inode
- * @inode4: fouth inode
- */
- static void unlock_4_inodes(struct inode *inode1, struct inode *inode2,
- struct inode *inode3, struct inode *inode4)
- {
- if (inode4)
- mutex_unlock(&ubifs_inode(inode4)->ui_mutex);
- if (inode3)
- mutex_unlock(&ubifs_inode(inode3)->ui_mutex);
- if (inode1 != inode2)
- mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
- mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
- }
- static int do_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry,
- unsigned int flags)
- {
- struct ubifs_info *c = old_dir->i_sb->s_fs_info;
- struct inode *old_inode = d_inode(old_dentry);
- struct inode *new_inode = d_inode(new_dentry);
- struct inode *whiteout = NULL;
- struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode);
- struct ubifs_inode *whiteout_ui = NULL;
- int err, release, sync = 0, move = (new_dir != old_dir);
- int is_dir = S_ISDIR(old_inode->i_mode);
- int unlink = !!new_inode, new_sz, old_sz;
- struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
- .dirtied_ino = 3 };
- struct ubifs_budget_req ino_req = { .dirtied_ino = 1,
- .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) };
- struct timespec64 time;
- unsigned int saved_nlink;
- struct fscrypt_name old_nm, new_nm;
- /*
- * Budget request settings: deletion direntry, new direntry, removing
- * the old inode, and changing old and new parent directory inodes.
- *
- * However, this operation also marks the target inode as dirty and
- * does not write it, so we allocate budget for the target inode
- * separately.
- */
- dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x",
- old_dentry, old_inode->i_ino, old_dir->i_ino,
- new_dentry, new_dir->i_ino, flags);
- if (unlink) {
- ubifs_assert(c, inode_is_locked(new_inode));
- err = ubifs_purge_xattrs(new_inode);
- if (err)
- return err;
- }
- if (unlink && is_dir) {
- err = ubifs_check_dir_empty(new_inode);
- if (err)
- return err;
- }
- err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &old_nm);
- if (err)
- return err;
- err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &new_nm);
- if (err) {
- fscrypt_free_filename(&old_nm);
- return err;
- }
- new_sz = CALC_DENT_SIZE(fname_len(&new_nm));
- old_sz = CALC_DENT_SIZE(fname_len(&old_nm));
- err = ubifs_budget_space(c, &req);
- if (err) {
- fscrypt_free_filename(&old_nm);
- fscrypt_free_filename(&new_nm);
- return err;
- }
- err = ubifs_budget_space(c, &ino_req);
- if (err) {
- fscrypt_free_filename(&old_nm);
- fscrypt_free_filename(&new_nm);
- ubifs_release_budget(c, &req);
- return err;
- }
- if (flags & RENAME_WHITEOUT) {
- union ubifs_dev_desc *dev = NULL;
- struct ubifs_budget_req wht_req;
- dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
- if (!dev) {
- err = -ENOMEM;
- goto out_release;
- }
- err = do_tmpfile(old_dir, old_dentry, S_IFCHR | WHITEOUT_MODE, &whiteout);
- if (err) {
- kfree(dev);
- goto out_release;
- }
- spin_lock(&whiteout->i_lock);
- whiteout->i_state |= I_LINKABLE;
- spin_unlock(&whiteout->i_lock);
- whiteout_ui = ubifs_inode(whiteout);
- whiteout_ui->data = dev;
- whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0));
- ubifs_assert(c, !whiteout_ui->dirty);
- memset(&wht_req, 0, sizeof(struct ubifs_budget_req));
- wht_req.dirtied_ino = 1;
- wht_req.dirtied_ino_d = ALIGN(whiteout_ui->data_len, 8);
- /*
- * To avoid deadlock between space budget (holds ui_mutex and
- * waits wb work) and writeback work(waits ui_mutex), do space
- * budget before ubifs inodes locked.
- */
- err = ubifs_budget_space(c, &wht_req);
- if (err) {
- iput(whiteout);
- goto out_release;
- }
- /* Add the old_dentry size to the old_dir size. */
- old_sz -= CALC_DENT_SIZE(fname_len(&old_nm));
- }
- lock_4_inodes(old_dir, new_dir, new_inode, whiteout);
- /*
- * Like most other Unix systems, set the @i_ctime for inodes on a
- * rename.
- */
- time = current_time(old_dir);
- old_inode->i_ctime = time;
- /* We must adjust parent link count when renaming directories */
- if (is_dir) {
- if (move) {
- /*
- * @old_dir loses a link because we are moving
- * @old_inode to a different directory.
- */
- drop_nlink(old_dir);
- /*
- * @new_dir only gains a link if we are not also
- * overwriting an existing directory.
- */
- if (!unlink)
- inc_nlink(new_dir);
- } else {
- /*
- * @old_inode is not moving to a different directory,
- * but @old_dir still loses a link if we are
- * overwriting an existing directory.
- */
- if (unlink)
- drop_nlink(old_dir);
- }
- }
- old_dir->i_size -= old_sz;
- ubifs_inode(old_dir)->ui_size = old_dir->i_size;
- old_dir->i_mtime = old_dir->i_ctime = time;
- new_dir->i_mtime = new_dir->i_ctime = time;
- /*
- * And finally, if we unlinked a direntry which happened to have the
- * same name as the moved direntry, we have to decrement @i_nlink of
- * the unlinked inode and change its ctime.
- */
- if (unlink) {
- /*
- * Directories cannot have hard-links, so if this is a
- * directory, just clear @i_nlink.
- */
- saved_nlink = new_inode->i_nlink;
- if (is_dir)
- clear_nlink(new_inode);
- else
- drop_nlink(new_inode);
- new_inode->i_ctime = time;
- } else {
- new_dir->i_size += new_sz;
- ubifs_inode(new_dir)->ui_size = new_dir->i_size;
- }
- /*
- * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode
- * is dirty, because this will be done later on at the end of
- * 'ubifs_rename()'.
- */
- if (IS_SYNC(old_inode)) {
- sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
- if (unlink && IS_SYNC(new_inode))
- sync = 1;
- }
- if (whiteout) {
- inc_nlink(whiteout);
- mark_inode_dirty(whiteout);
- spin_lock(&whiteout->i_lock);
- whiteout->i_state &= ~I_LINKABLE;
- spin_unlock(&whiteout->i_lock);
- iput(whiteout);
- }
- err = ubifs_jnl_rename(c, old_dir, old_inode, &old_nm, new_dir,
- new_inode, &new_nm, whiteout, sync);
- if (err)
- goto out_cancel;
- unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
- ubifs_release_budget(c, &req);
- mutex_lock(&old_inode_ui->ui_mutex);
- release = old_inode_ui->dirty;
- mark_inode_dirty_sync(old_inode);
- mutex_unlock(&old_inode_ui->ui_mutex);
- if (release)
- ubifs_release_budget(c, &ino_req);
- if (IS_SYNC(old_inode))
- err = old_inode->i_sb->s_op->write_inode(old_inode, NULL);
- fscrypt_free_filename(&old_nm);
- fscrypt_free_filename(&new_nm);
- return err;
- out_cancel:
- if (unlink) {
- set_nlink(new_inode, saved_nlink);
- } else {
- new_dir->i_size -= new_sz;
- ubifs_inode(new_dir)->ui_size = new_dir->i_size;
- }
- old_dir->i_size += old_sz;
- ubifs_inode(old_dir)->ui_size = old_dir->i_size;
- if (is_dir) {
- if (move) {
- inc_nlink(old_dir);
- if (!unlink)
- drop_nlink(new_dir);
- } else {
- if (unlink)
- inc_nlink(old_dir);
- }
- }
- if (whiteout) {
- drop_nlink(whiteout);
- iput(whiteout);
- }
- unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
- out_release:
- ubifs_release_budget(c, &ino_req);
- ubifs_release_budget(c, &req);
- fscrypt_free_filename(&old_nm);
- fscrypt_free_filename(&new_nm);
- return err;
- }
- static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry)
- {
- struct ubifs_info *c = old_dir->i_sb->s_fs_info;
- struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
- .dirtied_ino = 2 };
- int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
- struct inode *fst_inode = d_inode(old_dentry);
- struct inode *snd_inode = d_inode(new_dentry);
- struct timespec64 time;
- int err;
- struct fscrypt_name fst_nm, snd_nm;
- ubifs_assert(c, fst_inode && snd_inode);
- err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &fst_nm);
- if (err)
- return err;
- err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &snd_nm);
- if (err) {
- fscrypt_free_filename(&fst_nm);
- return err;
- }
- lock_4_inodes(old_dir, new_dir, NULL, NULL);
- time = current_time(old_dir);
- fst_inode->i_ctime = time;
- snd_inode->i_ctime = time;
- old_dir->i_mtime = old_dir->i_ctime = time;
- new_dir->i_mtime = new_dir->i_ctime = time;
- if (old_dir != new_dir) {
- if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) {
- inc_nlink(new_dir);
- drop_nlink(old_dir);
- }
- else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) {
- drop_nlink(new_dir);
- inc_nlink(old_dir);
- }
- }
- err = ubifs_jnl_xrename(c, old_dir, fst_inode, &fst_nm, new_dir,
- snd_inode, &snd_nm, sync);
- unlock_4_inodes(old_dir, new_dir, NULL, NULL);
- ubifs_release_budget(c, &req);
- fscrypt_free_filename(&fst_nm);
- fscrypt_free_filename(&snd_nm);
- return err;
- }
- static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry,
- unsigned int flags)
- {
- int err;
- struct ubifs_info *c = old_dir->i_sb->s_fs_info;
- if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE))
- return -EINVAL;
- ubifs_assert(c, inode_is_locked(old_dir));
- ubifs_assert(c, inode_is_locked(new_dir));
- err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
- flags);
- if (err)
- return err;
- if (flags & RENAME_EXCHANGE)
- return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry);
- return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
- }
- int ubifs_getattr(const struct path *path, struct kstat *stat,
- u32 request_mask, unsigned int flags)
- {
- loff_t size;
- struct inode *inode = d_inode(path->dentry);
- struct ubifs_inode *ui = ubifs_inode(inode);
- mutex_lock(&ui->ui_mutex);
- if (ui->flags & UBIFS_APPEND_FL)
- stat->attributes |= STATX_ATTR_APPEND;
- if (ui->flags & UBIFS_COMPR_FL)
- stat->attributes |= STATX_ATTR_COMPRESSED;
- if (ui->flags & UBIFS_CRYPT_FL)
- stat->attributes |= STATX_ATTR_ENCRYPTED;
- if (ui->flags & UBIFS_IMMUTABLE_FL)
- stat->attributes |= STATX_ATTR_IMMUTABLE;
- stat->attributes_mask |= (STATX_ATTR_APPEND |
- STATX_ATTR_COMPRESSED |
- STATX_ATTR_ENCRYPTED |
- STATX_ATTR_IMMUTABLE);
- generic_fillattr(inode, stat);
- stat->blksize = UBIFS_BLOCK_SIZE;
- stat->size = ui->ui_size;
- /*
- * Unfortunately, the 'stat()' system call was designed for block
- * device based file systems, and it is not appropriate for UBIFS,
- * because UBIFS does not have notion of "block". For example, it is
- * difficult to tell how many block a directory takes - it actually
- * takes less than 300 bytes, but we have to round it to block size,
- * which introduces large mistake. This makes utilities like 'du' to
- * report completely senseless numbers. This is the reason why UBIFS
- * goes the same way as JFFS2 - it reports zero blocks for everything
- * but regular files, which makes more sense than reporting completely
- * wrong sizes.
- */
- if (S_ISREG(inode->i_mode)) {
- size = ui->xattr_size;
- size += stat->size;
- size = ALIGN(size, UBIFS_BLOCK_SIZE);
- /*
- * Note, user-space expects 512-byte blocks count irrespectively
- * of what was reported in @stat->size.
- */
- stat->blocks = size >> 9;
- } else
- stat->blocks = 0;
- mutex_unlock(&ui->ui_mutex);
- return 0;
- }
- const struct inode_operations ubifs_dir_inode_operations = {
- .lookup = ubifs_lookup,
- .create = ubifs_create,
- .link = ubifs_link,
- .symlink = ubifs_symlink,
- .unlink = ubifs_unlink,
- .mkdir = ubifs_mkdir,
- .rmdir = ubifs_rmdir,
- .mknod = ubifs_mknod,
- .rename = ubifs_rename,
- .setattr = ubifs_setattr,
- .getattr = ubifs_getattr,
- #ifdef CONFIG_UBIFS_FS_XATTR
- .listxattr = ubifs_listxattr,
- #endif
- .update_time = ubifs_update_time,
- .tmpfile = ubifs_tmpfile,
- };
- const struct file_operations ubifs_dir_operations = {
- .llseek = generic_file_llseek,
- .release = ubifs_dir_release,
- .read = generic_read_dir,
- .iterate_shared = ubifs_readdir,
- .fsync = ubifs_fsync,
- .unlocked_ioctl = ubifs_ioctl,
- #ifdef CONFIG_COMPAT
- .compat_ioctl = ubifs_compat_ioctl,
- #endif
- };
|