* write it, but just marks it as dirty.
*/
+#include <sys/stat.h>
+
+#include "linux_err.h"
+#include "bitops.h"
+#include "kmem.h"
#include "ubifs.h"
+#include "defs.h"
+#include "debug.h"
+#include "key.h"
+#include "misc.h"
+
+/**
+ * inherit_flags - inherit flags of the parent inode.
+ * @c: UBIFS file-system description object
+ * @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(struct ubifs_info *c, const struct inode *dir,
+ unsigned int mode)
+{
+ int flags;
+ const struct ubifs_inode *ui = ubifs_inode(dir);
+
+ ubifs_assert(c, S_ISDIR(dir->mode));
+
+ 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 inode
+ * @mode: inode mode flags
+ *
+ * This function finds an unused inode number, allocates new ubifs inode and
+ * initializes it. Returns new ubifs inode in case of success and an error code
+ * in case of failure.
+ */
+static struct ubifs_inode *ubifs_new_inode(struct ubifs_info *c,
+ const struct inode *dir,
+ unsigned int mode)
+{
+ int err;
+ time_t now = time(NULL);
+ struct ubifs_inode *ui;
+ struct inode *inode;
+
+ ui = kzalloc(sizeof(struct ubifs_inode), GFP_KERNEL);
+ if (!ui)
+ return ERR_PTR(-ENOMEM);
+
+ inode = &ui->vfs_inode;
+ inode->atime_sec = inode->ctime_sec = inode->mtime_sec = now;
+ inode->nlink = 1;
+ inode->mode = mode;
+ if (dir) {
+ /* Create non root dir. */
+ inode->uid = dir->uid;
+ inode->gid = dir->gid;
+ if ((dir->mode & S_ISGID) && S_ISDIR(mode))
+ inode->mode |= S_ISGID;
+ ui->flags = inherit_flags(c, dir, mode);
+ }
+ if (S_ISDIR(mode))
+ ui->ui_size = UBIFS_INO_NODE_SZ;
+ if (S_ISREG(mode))
+ ui->compr_type = c->default_compr;
+ else
+ ui->compr_type = UBIFS_COMPR_NONE;
+
+ if (dir) {
+ 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;
+ }
+ ubifs_warn(c, "running out of inode numbers (current %lu, max %u)",
+ (unsigned long)c->highest_inum, INUM_WATERMARK);
+ }
+ inode->inum = ++c->highest_inum;
+ } else {
+ /* Create root dir. */
+ inode->inum = UBIFS_ROOT_INO;
+ }
+ /*
+ * 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);
+
+ return ui;
+
+out:
+ kfree(ui);
+ return ERR_PTR(err);
+}
+
+/**
+ * ubifs_lookup_by_inum - look up the UBIFS inode according to inode number.
+ * @c: UBIFS file-system description object
+ * @inum: inode number
+ *
+ * This function looks up the UBIFS inode according to a given inode number.
+ * Returns zero in case of success and an error code in case of failure.
+ */
+struct ubifs_inode *ubifs_lookup_by_inum(struct ubifs_info *c, ino_t inum)
+{
+ int err;
+ union ubifs_key key;
+ struct inode *inode;
+ struct ubifs_inode *ui;
+ struct ubifs_ino_node *ino = NULL;
+
+ ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
+ if (!ino)
+ return ERR_PTR(-ENOMEM);
+
+ ui = kzalloc(sizeof(struct ubifs_inode), GFP_KERNEL);
+ if (!ui) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ inode = &ui->vfs_inode;
+ ino_key_init(c, &key, inum);
+ err = ubifs_tnc_lookup(c, &key, ino);
+ if (err) {
+ kfree(ui);
+ ubifs_assert(c, !get_failure_reason_callback(c));
+ goto out;
+ }
+
+ inode = &ui->vfs_inode;
+ inode->inum = inum;
+ inode->uid = le32_to_cpu(ino->uid);
+ inode->gid = le32_to_cpu(ino->gid);
+ inode->mode = le32_to_cpu(ino->mode);
+ inode->nlink = le32_to_cpu(ino->nlink);
+ inode->atime_sec = le64_to_cpu(ino->atime_sec);
+ inode->ctime_sec = le64_to_cpu(ino->ctime_sec);
+ inode->mtime_sec = le64_to_cpu(ino->mtime_sec);
+ inode->atime_nsec = le32_to_cpu(ino->atime_nsec);
+ inode->ctime_nsec = le32_to_cpu(ino->ctime_nsec);
+ inode->mtime_nsec = le32_to_cpu(ino->mtime_nsec);
+ ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum);
+ ui->xattr_size = le32_to_cpu(ino->xattr_size);
+ ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt);
+ ui->xattr_names = le32_to_cpu(ino->xattr_names);
+ ui->compr_type = le16_to_cpu(ino->compr_type);
+ ui->ui_size = le64_to_cpu(ino->size);
+ ui->flags = le32_to_cpu(ino->flags);
+ ui->data_len = le32_to_cpu(ino->data_len);
+
+out:
+ kfree(ino);
+ return err ? ERR_PTR(err) : ui;
+}
+
+struct ubifs_inode *ubifs_lookup(struct ubifs_info *c,
+ struct ubifs_inode *dir_ui,
+ const struct fscrypt_name *nm)
+{
+ int err;
+ ino_t inum;
+ union ubifs_key key;
+ struct ubifs_dent_node *dent;
+
+ if (fname_len(nm) > UBIFS_MAX_NLEN)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
+ if (!dent)
+ return ERR_PTR(-ENOMEM);
+
+ dent_key_init(c, &key, dir_ui->vfs_inode.inum, nm);
+ err = ubifs_tnc_lookup_nm(c, &key, dent, nm);
+ if (err) {
+ kfree(dent);
+ ubifs_assert(c, !get_failure_reason_callback(c));
+ return ERR_PTR(err);
+ }
+ inum = le64_to_cpu(dent->inum);
+ kfree(dent);
+
+ return ubifs_lookup_by_inum(c, inum);
+}
+
+int ubifs_mkdir(struct ubifs_info *c, struct ubifs_inode *dir_ui,
+ const struct fscrypt_name *nm, unsigned int mode)
+{
+ struct ubifs_inode *ui;
+ struct inode *inode, *dir = &dir_ui->vfs_inode;
+ int err, sz_change;
+ struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
+ .dirtied_ino = 1};
+ /*
+ * Budget request settings: new inode, new direntry and changing parent
+ * directory inode.
+ */
+ dbg_gen("dent '%s', mode %#hx in dir ino %lu",
+ fname_name(nm), mode, dir->inum);
+
+ /* New dir is not allowed to be created under an encrypted directory. */
+ ubifs_assert(c, !(dir_ui->flags & UBIFS_CRYPT_FL));
+
+ err = ubifs_budget_space(c, &req);
+ if (err)
+ return err;
+
+ sz_change = CALC_DENT_SIZE(fname_len(nm));
+
+ ui = ubifs_new_inode(c, dir, S_IFDIR | mode);
+ if (IS_ERR(ui)) {
+ err = PTR_ERR(ui);
+ goto out_budg;
+ }
+
+ inode = &ui->vfs_inode;
+ inode->nlink++;
+ dir->nlink++;
+ dir_ui->ui_size += sz_change;
+ dir->ctime_sec = dir->mtime_sec = inode->ctime_sec;
+ err = ubifs_jnl_update_file(c, dir_ui, nm, ui);
+ if (err) {
+ ubifs_err(c, "cannot create directory, error %d", err);
+ goto out_cancel;
+ }
+
+ kfree(ui);
+ ubifs_release_budget(c, &req);
+ return 0;
+
+out_cancel:
+ dir_ui->ui_size -= sz_change;
+ dir->nlink--;
+ kfree(ui);
+out_budg:
+ ubifs_release_budget(c, &req);
+ return err;
+}
+
+/**
+ * ubifs_link_recovery - link a disconnected file into the target directory.
+ * @c: UBIFS file-system description object
+ * @dir_ui: target directory
+ * @ui: the UBIFS inode of disconnected file
+ * @nm: directory entry name
+ *
+ * This function links the inode of disconnected file to a directory entry name
+ * under the target directory. Returns zero in case of success and an error code
+ * in case of failure.
+ */
+int ubifs_link_recovery(struct ubifs_info *c, struct ubifs_inode *dir_ui,
+ struct ubifs_inode *ui, const struct fscrypt_name *nm)
+{
+ struct inode *inode = &ui->vfs_inode, *dir = &dir_ui->vfs_inode;
+ int err, sz_change;
+ struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2,
+ .dirtied_ino_d = ALIGN(ui->data_len, 8) };
+ time_t now = time(NULL);
+
+ /*
+ * Budget request settings: new direntry, changing the target inode,
+ * changing the parent inode.
+ */
+ dbg_gen("dent '%s' to ino %lu (nlink %d) in dir ino %lu",
+ fname_name(nm), inode->inum, inode->nlink, dir->inum);
+
+ /* New dir is not allowed to be created under an encrypted directory. */
+ ubifs_assert(c, !(dir_ui->flags & UBIFS_CRYPT_FL));
+
+ sz_change = CALC_DENT_SIZE(fname_len(nm));
+
+ err = ubifs_budget_space(c, &req);
+ if (err)
+ return err;
+
+ inode->ctime_sec = now;
+ dir_ui->ui_size += sz_change;
+ dir->ctime_sec = dir->mtime_sec = now;
+ err = ubifs_jnl_update_file(c, dir_ui, nm, ui);
+ if (err)
+ goto out_cancel;
+
+ ubifs_release_budget(c, &req);
+ return 0;
+
+out_cancel:
+ dir_ui->ui_size -= sz_change;
+ ubifs_release_budget(c, &req);
+ return err;
+}
+
+/**
+ * ubifs_create_root - create the root inode.
+ * @c: UBIFS file-system description object
+ *
+ * This function creates a new inode for the root directory. Returns zero in
+ * case of success and an error code in case of failure.
+ */
+int ubifs_create_root(struct ubifs_info *c)
+{
+ int err;
+ struct inode *inode;
+ struct ubifs_budget_req req = { .new_ino = 1 };
+ struct ubifs_inode *ui;
+
+ /* Budget request settings: new inode. */
+ dbg_gen("create root dir");
+
+ err = ubifs_budget_space(c, &req);
+ if (err)
+ return err;
+
+ ui = ubifs_new_inode(c, NULL, S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO);
+ if (IS_ERR(ui)) {
+ err = PTR_ERR(ui);
+ goto out_budg;
+ }
+
+ inode = &ui->vfs_inode;
+ inode->nlink = 2;
+ ui->ui_size = UBIFS_INO_NODE_SZ;
+ ui->flags = UBIFS_COMPR_FL;
+ err = ubifs_jnl_update_file(c, NULL, NULL, ui);
+ if (err)
+ goto out_ui;
+
+ kfree(ui);
+ ubifs_release_budget(c, &req);
+ return 0;
+
+out_ui:
+ kfree(ui);
+out_budg:
+ ubifs_release_budget(c, &req);
+ ubifs_err(c, "cannot create root dir, error %d", err);
+ return err;
+}
*/
#include "bitops.h"
+#include "kmem.h"
#include "ubifs.h"
#include "defs.h"
#include "debug.h"
+#include "key.h"
#include "misc.h"
/**
else
dent->cookie = 0;
}
+
+/**
+ * pack_inode - pack an ubifs inode node.
+ * @c: UBIFS file-system description object
+ * @ino: buffer in which to pack inode node
+ * @ui: ubifs inode to pack
+ * @last: indicates the last node of the group
+ */
+static void pack_inode(struct ubifs_info *c, struct ubifs_ino_node *ino,
+ const struct ubifs_inode *ui, int last)
+{
+ const struct inode *inode = &ui->vfs_inode;
+ int data_len = 0, last_reference = !inode->nlink;
+
+ ino->ch.node_type = UBIFS_INO_NODE;
+ ino_key_init_flash(c, &ino->key, inode->inum);
+ ino->creat_sqnum = cpu_to_le64(ui->creat_sqnum);
+ ino->atime_sec = cpu_to_le64(inode->atime_sec);
+ ino->atime_nsec = cpu_to_le32(inode->atime_nsec);
+ ino->ctime_sec = cpu_to_le64(inode->ctime_sec);
+ ino->ctime_nsec = cpu_to_le32(inode->ctime_nsec);
+ ino->mtime_sec = cpu_to_le64(inode->mtime_sec);
+ ino->mtime_nsec = cpu_to_le32(inode->mtime_nsec);
+ ino->uid = cpu_to_le32(inode->uid);
+ ino->gid = cpu_to_le32(inode->gid);
+ ino->mode = cpu_to_le32(inode->mode);
+ ino->flags = cpu_to_le32(ui->flags);
+ ino->size = cpu_to_le64(ui->ui_size);
+ ino->nlink = cpu_to_le32(inode->nlink);
+ ino->compr_type = cpu_to_le16(ui->compr_type);
+ ino->data_len = cpu_to_le32(ui->data_len);
+ ino->xattr_cnt = cpu_to_le32(ui->xattr_cnt);
+ ino->xattr_size = cpu_to_le32(ui->xattr_size);
+ ino->xattr_names = cpu_to_le32(ui->xattr_names);
+ zero_ino_node_unused(ino);
+
+ /*
+ * Drop the attached data if this is a deletion inode, the data is not
+ * needed anymore.
+ */
+ if (!last_reference) {
+ memcpy(ino->data, ui->data, ui->data_len);
+ data_len = ui->data_len;
+ }
+
+ ubifs_prep_grp_node(c, ino, UBIFS_INO_NODE_SZ + data_len, last);
+}
+
+/**
+ * ubifs_jnl_update_file - update file.
+ * @c: UBIFS file-system description object
+ * @dir_ui: parent ubifs inode
+ * @nm: directory entry name
+ * @ui: ubifs inode to update
+ *
+ * This function updates an file by writing a directory entry node, the inode
+ * node itself, and the parent directory inode node to the journal. If the
+ * @dir_ui and @nm are NULL, only update @ui.
+ *
+ * Returns zero on success. In case of failure, a negative error code is
+ * returned.
+ */
+int ubifs_jnl_update_file(struct ubifs_info *c,
+ const struct ubifs_inode *dir_ui,
+ const struct fscrypt_name *nm,
+ const struct ubifs_inode *ui)
+{
+ const struct inode *dir = NULL, *inode = &ui->vfs_inode;
+ int err, dlen, ilen, len, lnum, ino_offs, dent_offs, dir_ilen;
+ int aligned_dlen, aligned_ilen;
+ struct ubifs_dent_node *dent;
+ struct ubifs_ino_node *ino;
+ union ubifs_key dent_key, ino_key;
+ u8 hash_dent[UBIFS_HASH_ARR_SZ];
+ u8 hash_ino[UBIFS_HASH_ARR_SZ];
+ u8 hash_ino_dir[UBIFS_HASH_ARR_SZ];
+
+ ubifs_assert(c, (!nm && !dir_ui) || (nm && dir_ui));
+ ubifs_assert(c, inode->nlink != 0);
+
+ ilen = UBIFS_INO_NODE_SZ + ui->data_len;
+
+ if (nm)
+ dlen = UBIFS_DENT_NODE_SZ + fname_len(nm) + 1;
+ else
+ dlen = 0;
+
+ if (dir_ui) {
+ dir = &dir_ui->vfs_inode;
+ ubifs_assert(c, dir->nlink != 0);
+ dir_ilen = UBIFS_INO_NODE_SZ + dir_ui->data_len;
+ } else
+ dir_ilen = 0;
+
+ aligned_dlen = ALIGN(dlen, 8);
+ aligned_ilen = ALIGN(ilen, 8);
+ len = aligned_dlen + aligned_ilen + dir_ilen;
+ if (ubifs_authenticated(c))
+ len += ALIGN(dir_ilen, 8) + ubifs_auth_node_sz(c);
+
+ dent = kzalloc(len, GFP_NOFS);
+ if (!dent)
+ return -ENOMEM;
+
+ /* Make reservation before allocating sequence numbers */
+ err = make_reservation(c, BASEHD, len);
+ if (err)
+ goto out_free;
+
+ if (nm) {
+ dent->ch.node_type = UBIFS_DENT_NODE;
+ dent_key_init(c, &dent_key, dir->inum, nm);
+
+ key_write(c, &dent_key, dent->key);
+ dent->inum = cpu_to_le64(inode->inum);
+ dent->type = ubifs_get_dent_type(inode->mode);
+ dent->nlen = cpu_to_le16(fname_len(nm));
+ memcpy(dent->name, fname_name(nm), fname_len(nm));
+ dent->name[fname_len(nm)] = '\0';
+ set_dent_cookie(c, dent);
+
+ zero_dent_node_unused(dent);
+ ubifs_prep_grp_node(c, dent, dlen, 0);
+ err = ubifs_node_calc_hash(c, dent, hash_dent);
+ if (err)
+ goto out_release;
+ }
+
+ ino = (void *)dent + aligned_dlen;
+ pack_inode(c, ino, ui, dir_ui == NULL ? 1 : 0);
+ err = ubifs_node_calc_hash(c, ino, hash_ino);
+ if (err)
+ goto out_release;
+
+ if (dir_ui) {
+ ino = (void *)ino + aligned_ilen;
+ pack_inode(c, ino, dir_ui, 1);
+ err = ubifs_node_calc_hash(c, ino, hash_ino_dir);
+ if (err)
+ goto out_release;
+ }
+
+ err = write_head(c, BASEHD, dent, len, &lnum, &dent_offs, 0);
+ if (err)
+ goto out_release;
+ release_head(c, BASEHD);
+ kfree(dent);
+ ubifs_add_auth_dirt(c, lnum);
+
+ if (nm) {
+ err = ubifs_tnc_add_nm(c, &dent_key, lnum, dent_offs, dlen,
+ hash_dent, nm);
+ if (err) {
+ ubifs_assert(c, !get_failure_reason_callback(c));
+ goto out_ro;
+ }
+ }
+
+ ino_key_init(c, &ino_key, inode->inum);
+ ino_offs = dent_offs + aligned_dlen;
+ err = ubifs_tnc_add(c, &ino_key, lnum, ino_offs, ilen, hash_ino);
+ if (err) {
+ ubifs_assert(c, !get_failure_reason_callback(c));
+ goto out_ro;
+ }
+
+ if (dir_ui) {
+ ino_key_init(c, &ino_key, dir->inum);
+ ino_offs += aligned_ilen;
+ err = ubifs_tnc_add(c, &ino_key, lnum, ino_offs, dir_ilen,
+ hash_ino_dir);
+ if (err) {
+ ubifs_assert(c, !get_failure_reason_callback(c));
+ goto out_ro;
+ }
+ }
+
+ finish_reservation(c);
+ return 0;
+
+out_free:
+ kfree(dent);
+ return err;
+
+out_release:
+ release_head(c, BASEHD);
+ kfree(dent);
+out_ro:
+ ubifs_ro_mode(c, err);
+ finish_reservation(c);
+ return err;
+}
int unmap;
};
+/**
+ * struct inode - inode description.
+ * @uid: owner ID
+ * @gid: group ID
+ * @mode: access flags
+ * @nlink: number of hard links
+ * @inum: inode number
+ * @atime_sec: access time seconds
+ * @ctime_sec: creation time seconds
+ * @mtime_sec: modification time seconds
+ * @atime_nsec: access time nanoseconds
+ * @ctime_nsec: creation time nanoseconds
+ * @mtime_nsec: modification time nanoseconds
+ */
+struct inode {
+ unsigned int uid;
+ unsigned int gid;
+ unsigned int mode;
+ unsigned int nlink;
+ ino_t inum;
+ unsigned long long atime_sec;
+ unsigned long long ctime_sec;
+ unsigned long long mtime_sec;
+ unsigned int atime_nsec;
+ unsigned int ctime_nsec;
+ unsigned int mtime_nsec;
+};
+
/**
* struct ubifs_inode - UBIFS in-memory inode description.
+ * @vfs_inode: VFS inode description object
* @creat_sqnum: sequence number at time of creation
* @xattr_size: summarized size of all extended attributes in bytes
* @xattr_cnt: count of extended attributes this inode has
* @data: inode's data
*/
struct ubifs_inode {
+ struct inode vfs_inode;
unsigned long long creat_sqnum;
unsigned int xattr_size;
unsigned int xattr_cnt;
/* journal.c */
int ubifs_get_dent_type(int mode);
+int ubifs_jnl_update_file(struct ubifs_info *c,
+ const struct ubifs_inode *dir_ui,
+ const struct fscrypt_name *nm,
+ const struct ubifs_inode *ui);
/* budget.c */
int ubifs_budget_space(struct ubifs_info *c, struct ubifs_budget_req *req);
const struct ubifs_lprops *ubifs_fast_find_frdi_idx(struct ubifs_info *c);
int ubifs_calc_dark(const struct ubifs_info *c, int spc);
+/* dir.c */
+struct ubifs_inode *ubifs_lookup_by_inum(struct ubifs_info *c, ino_t inum);
+struct ubifs_inode *ubifs_lookup(struct ubifs_info *c,
+ struct ubifs_inode *dir_ui,
+ const struct fscrypt_name *nm);
+int ubifs_mkdir(struct ubifs_info *c, struct ubifs_inode *dir_ui,
+ const struct fscrypt_name *nm, unsigned int mode);
+int ubifs_link_recovery(struct ubifs_info *c, struct ubifs_inode *dir_ui,
+ struct ubifs_inode *ui, const struct fscrypt_name *nm);
+int ubifs_create_root(struct ubifs_info *c);
+
/* super.c */
int open_ubi(struct ubifs_info *c, const char *node);
void close_ubi(struct ubifs_info *c);
projects / mtd-utils.git / commitdiff