[RFC PATCH mtd-utils 043/110] ubifs-utils: Adapt dir.c in libubifs
Zhihao Cheng
chengzhihao1 at huawei.com
Thu Jun 6 21:25:08 PDT 2024
Adapt dir.c in libubifs, compared with linux kernel implementations:
1. Remove all functions. Only keep an empty source file, fsck will
add new functions for mkdir/link operations without using linux
in-memory inode/dentry.
Signed-off-by: Zhihao Cheng <chengzhihao1 at huawei.com>
---
ubifs-utils/libubifs/dir.c | 1713 --------------------------------------------
1 file changed, 1713 deletions(-)
diff --git a/ubifs-utils/libubifs/dir.c b/ubifs-utils/libubifs/dir.c
index c77ea57f..9d5f6446 100644
--- a/ubifs-utils/libubifs/dir.c
+++ b/ubifs-utils/libubifs/dir.c
@@ -29,1716 +29,3 @@
*/
#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
- * @is_xattr: whether the inode is xattr inode
- *
- * This function finds an unused inode number, allocates new inode and
- * initializes it. Non-xattr new inode may be written with xattrs(selinux/
- * encryption) before writing dentry, which could cause inconsistent problem
- * when powercut happens between two operations. To deal with it, non-xattr
- * new inode is initialized with zero-nlink and added into orphan list, caller
- * should make sure that inode is relinked later, and make sure that orphan
- * removing and journal writing into an committing atomic operation. 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, bool is_xattr)
-{
- 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(&nop_mnt_idmap, inode, dir, mode);
- simple_inode_init_ts(inode);
- inode->i_mapping->nrpages = 0;
-
- if (!is_xattr) {
- 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 (!is_xattr) {
- set_nlink(inode, 0);
- err = ubifs_add_orphan(c, inode->i_ino);
- if (err) {
- ubifs_err(c, "ubifs_add_orphan failed: %i", err);
- goto out_iput;
- }
- down_read(&c->commit_sem);
- ui->del_cmtno = c->cmt_no;
- up_read(&c->commit_sem);
- }
-
- if (encrypted) {
- err = fscrypt_set_context(inode, NULL);
- if (err) {
- if (!is_xattr) {
- set_nlink(inode, 1);
- ubifs_delete_orphan(c, inode->i_ino);
- }
- 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);
- 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 mnt_idmap *idmap, 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, false);
- 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;
-
- set_nlink(inode, 1);
- mutex_lock(&dir_ui->ui_mutex);
- dir->i_size += sz_change;
- dir_ui->ui_size = dir->i_size;
- inode_set_mtime_to_ts(dir,
- inode_set_ctime_to_ts(dir, inode_get_ctime(inode)));
- err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0, 1);
- 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);
- set_nlink(inode, 0);
-out_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 struct inode *create_whiteout(struct inode *dir, struct dentry *dentry)
-{
- int err;
- umode_t mode = S_IFCHR | WHITEOUT_MODE;
- struct inode *inode;
- struct ubifs_info *c = dir->i_sb->s_fs_info;
-
- /*
- * Create an inode('nlink = 1') for whiteout without updating journal,
- * let ubifs_jnl_rename() store it on flash to complete rename whiteout
- * atomically.
- */
-
- dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
- dentry, mode, dir->i_ino);
-
- inode = ubifs_new_inode(c, dir, mode, false);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- goto out_free;
- }
-
- 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;
-
- /* The dir size is updated by do_rename. */
- insert_inode_hash(inode);
-
- return inode;
-
-out_inode:
- iput(inode);
-out_free:
- ubifs_err(c, "cannot create whiteout file, error %d", err);
- return ERR_PTR(err);
-}
-
-/**
- * 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_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
- struct file *file, umode_t mode)
-{
- struct dentry *dentry = file->f_path.dentry;
- 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;
- 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, false);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- goto out_budg;
- }
- ui = ubifs_inode(inode);
-
- err = ubifs_init_security(dir, inode, &dentry->d_name);
- if (err)
- goto out_inode;
-
- set_nlink(inode, 1);
- mutex_lock(&ui->ui_mutex);
- insert_inode_hash(inode);
- d_tmpfile(file, inode);
- ubifs_assert(c, ui->dirty);
-
- instantiated = 1;
- mutex_unlock(&ui->ui_mutex);
-
- lock_2_inodes(dir, inode);
- err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0, 1);
- if (err)
- goto out_cancel;
- unlock_2_inodes(dir, inode);
-
- ubifs_release_budget(c, &req);
- fscrypt_free_filename(&nm);
-
- return finish_open_simple(file, 0);
-
-out_cancel:
- unlock_2_inodes(dir, inode);
-out_inode:
- if (!instantiated)
- iput(inode);
-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;
-}
-
-/**
- * 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;
-}
-
-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;
- 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;
-
- sz_change = CALC_DENT_SIZE(fname_len(&nm));
-
- 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);
-
- inc_nlink(inode);
- ihold(inode);
- inode_set_ctime_current(inode);
- dir->i_size += sz_change;
- dir_ui->ui_size = dir->i_size;
- inode_set_mtime_to_ts(dir,
- inode_set_ctime_to_ts(dir, inode_get_ctime(inode)));
- err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0, inode->i_nlink == 1);
- 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);
- 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_set_ctime_current(inode);
- drop_nlink(inode);
- dir->i_size -= sz_change;
- dir_ui->ui_size = dir->i_size;
- inode_set_mtime_to_ts(dir,
- inode_set_ctime_to_ts(dir, inode_get_ctime(inode)));
- err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0, 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;
-}
-
-/**
- * ubifs_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 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_set_ctime_current(inode);
- clear_nlink(inode);
- drop_nlink(dir);
- dir->i_size -= sz_change;
- dir_ui->ui_size = dir->i_size;
- inode_set_mtime_to_ts(dir,
- inode_set_ctime_to_ts(dir, inode_get_ctime(inode)));
- err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0, 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 mnt_idmap *idmap, 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, false);
- 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;
-
- set_nlink(inode, 1);
- 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;
- inode_set_mtime_to_ts(dir,
- inode_set_ctime_to_ts(dir, inode_get_ctime(inode)));
- err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0, 1);
- 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);
- set_nlink(inode, 0);
-out_inode:
- iput(inode);
-out_fname:
- fscrypt_free_filename(&nm);
-out_budg:
- ubifs_release_budget(c, &req);
- return err;
-}
-
-static int ubifs_mknod(struct mnt_idmap *idmap, 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, false);
- if (IS_ERR(inode)) {
- kfree(dev);
- err = PTR_ERR(inode);
- goto out_fname;
- }
-
- err = ubifs_init_security(dir, inode, &dentry->d_name);
- if (err) {
- kfree(dev);
- goto out_inode;
- }
-
- 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;
- set_nlink(inode, 1);
-
- mutex_lock(&dir_ui->ui_mutex);
- dir->i_size += sz_change;
- dir_ui->ui_size = dir->i_size;
- inode_set_mtime_to_ts(dir,
- inode_set_ctime_to_ts(dir, inode_get_ctime(inode)));
- err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0, 1);
- 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);
- set_nlink(inode, 0);
-out_inode:
- iput(inode);
-out_fname:
- fscrypt_free_filename(&nm);
-out_budg:
- ubifs_release_budget(c, &req);
- return err;
-}
-
-static int ubifs_symlink(struct mnt_idmap *idmap, 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,
- .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.
- */
- req.new_ino_d = ALIGN(disk_link.len - 1, 8);
- 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, false);
- 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;
-
- 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;
- set_nlink(inode, 1);
-
- mutex_lock(&dir_ui->ui_mutex);
- dir->i_size += sz_change;
- dir_ui->ui_size = dir->i_size;
- inode_set_mtime_to_ts(dir,
- inode_set_ctime_to_ts(dir, inode_get_ctime(inode)));
- err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0, 1);
- 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);
- set_nlink(inode, 0);
-out_inode:
- /* Free inode->i_link before inode is marked as bad. */
- fscrypt_free_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: fourth 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: fourth 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 ubifs_budget_req wht_req;
- unsigned int saved_nlink;
- struct fscrypt_name old_nm, new_nm;
-
- /*
- * Budget request settings:
- * req: deletion direntry, new direntry, removing the old inode,
- * and changing old and new parent directory inodes.
- *
- * wht_req: new whiteout inode for RENAME_WHITEOUT.
- *
- * ino_req: marks the target inode as dirty and does not write it.
- */
-
- 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));
-
- /* Budget for old inode's data when its nlink > 1. */
- req.dirtied_ino_d = ALIGN(ubifs_inode(new_inode)->data_len, 8);
- 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;
-
- dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
- if (!dev) {
- err = -ENOMEM;
- goto out_release;
- }
-
- /*
- * The whiteout inode without dentry is pinned in memory,
- * umount won't happen during rename process because we
- * got parent dentry.
- */
- whiteout = create_whiteout(old_dir, old_dentry);
- if (IS_ERR(whiteout)) {
- err = PTR_ERR(whiteout);
- kfree(dev);
- goto out_release;
- }
-
- 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.new_ino = 1;
- wht_req.new_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;
- }
- set_nlink(whiteout, 1);
-
- /* 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.
- */
- simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
-
- /* 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;
-
- /*
- * 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.
- */
- 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);
- } 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;
- /*
- * S_SYNC flag of whiteout inherits from the old_dir, and we
- * have already checked the old dir inode. So there is no need
- * to check whiteout.
- */
- }
-
- err = ubifs_jnl_rename(c, old_dir, old_inode, &old_nm, new_dir,
- new_inode, &new_nm, whiteout, sync, !!whiteout);
- if (err)
- goto out_cancel;
-
- unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
- ubifs_release_budget(c, &req);
-
- if (whiteout) {
- ubifs_release_budget(c, &wht_req);
- iput(whiteout);
- }
-
- 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))
- /*
- * Rename finished here. Although old inode cannot be updated
- * on flash, old ctime is not a big problem, don't return err
- * code to userspace.
- */
- old_inode->i_sb->s_op->write_inode(old_inode, NULL);
-
- fscrypt_free_filename(&old_nm);
- fscrypt_free_filename(&new_nm);
- return 0;
-
-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);
- }
- }
- unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
- if (whiteout) {
- ubifs_release_budget(c, &wht_req);
- set_nlink(whiteout, 0);
- iput(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);
- int err;
- struct fscrypt_name fst_nm, snd_nm;
-
- ubifs_assert(c, fst_inode && snd_inode);
-
- /*
- * Budget request settings: changing two direntries, changing the two
- * parent directory inodes.
- */
-
- dbg_gen("dent '%pd' ino %lu in dir ino %lu exchange dent '%pd' ino %lu in dir ino %lu",
- old_dentry, fst_inode->i_ino, old_dir->i_ino,
- new_dentry, snd_inode->i_ino, new_dir->i_ino);
-
- 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;
- }
-
- err = ubifs_budget_space(c, &req);
- if (err)
- goto out;
-
- lock_4_inodes(old_dir, new_dir, NULL, NULL);
-
- simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
-
- 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);
-
-out:
- fscrypt_free_filename(&fst_nm);
- fscrypt_free_filename(&snd_nm);
- return err;
-}
-
-static int ubifs_rename(struct mnt_idmap *idmap,
- 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(struct mnt_idmap *idmap, 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(&nop_mnt_idmap, request_mask, 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,
- .listxattr = ubifs_listxattr,
- .update_time = ubifs_update_time,
- .tmpfile = ubifs_tmpfile,
- .fileattr_get = ubifs_fileattr_get,
- .fileattr_set = ubifs_fileattr_set,
-};
-
-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
-};
--
2.13.6
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