summaryrefslogtreecommitdiffstats
path: root/exfat/node.c
diff options
context:
space:
mode:
Diffstat (limited to 'exfat/node.c')
-rw-r--r--exfat/node.c1038
1 files changed, 0 insertions, 1038 deletions
diff --git a/exfat/node.c b/exfat/node.c
deleted file mode 100644
index d5104038e..000000000
--- a/exfat/node.c
+++ /dev/null
@@ -1,1038 +0,0 @@
-/*
- node.c (09.10.09)
- exFAT file system implementation library.
-
- Copyright (C) 2010-2012 Andrew Nayenko
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include "exfat.h"
-#include <errno.h>
-#include <string.h>
-#include <inttypes.h>
-
-/* on-disk nodes iterator */
-struct iterator
-{
- cluster_t cluster;
- off64_t offset;
- int contiguous;
- char* chunk;
-};
-
-struct exfat_node* exfat_get_node(struct exfat_node* node)
-{
- /* if we switch to multi-threaded mode we will need atomic
- increment here and atomic decrement in exfat_put_node() */
- node->references++;
- return node;
-}
-
-void exfat_put_node(struct exfat* ef, struct exfat_node* node)
-{
- if (--node->references < 0)
- {
- char buffer[EXFAT_NAME_MAX + 1];
- exfat_get_name(node, buffer, EXFAT_NAME_MAX);
- exfat_bug("reference counter of `%s' is below zero", buffer);
- }
-
- if (node->references == 0)
- {
- if (node->flags & EXFAT_ATTRIB_DIRTY)
- exfat_flush_node(ef, node);
- if (node->flags & EXFAT_ATTRIB_UNLINKED)
- {
- /* free all clusters and node structure itself */
- exfat_truncate(ef, node, 0);
- free(node);
- }
- if (ef->cmap.dirty)
- exfat_flush_cmap(ef);
- }
-}
-
-/**
- * Cluster + offset from the beginning of the directory to absolute offset.
- */
-static off64_t co2o(struct exfat* ef, cluster_t cluster, off64_t offset)
-{
- return exfat_c2o(ef, cluster) + offset % CLUSTER_SIZE(*ef->sb);
-}
-
-static int opendir(struct exfat* ef, const struct exfat_node* dir,
- struct iterator* it)
-{
- if (!(dir->flags & EXFAT_ATTRIB_DIR))
- exfat_bug("not a directory");
- it->cluster = dir->start_cluster;
- it->offset = 0;
- it->contiguous = IS_CONTIGUOUS(*dir);
- it->chunk = malloc(CLUSTER_SIZE(*ef->sb));
- if (it->chunk == NULL)
- {
- exfat_error("out of memory");
- return -ENOMEM;
- }
- exfat_pread(ef->dev, it->chunk, CLUSTER_SIZE(*ef->sb),
- exfat_c2o(ef, it->cluster));
- return 0;
-}
-
-static void closedir(struct iterator* it)
-{
- it->cluster = 0;
- it->offset = 0;
- it->contiguous = 0;
- free(it->chunk);
- it->chunk = NULL;
-}
-
-static int fetch_next_entry(struct exfat* ef, const struct exfat_node* parent,
- struct iterator* it)
-{
- /* move iterator to the next entry in the directory */
- it->offset += sizeof(struct exfat_entry);
- /* fetch the next cluster if needed */
- if ((it->offset & (CLUSTER_SIZE(*ef->sb) - 1)) == 0)
- {
- /* reached the end of directory; the caller should check this
- condition too */
- if (it->offset >= parent->size)
- return 0;
- it->cluster = exfat_next_cluster(ef, parent, it->cluster);
- if (CLUSTER_INVALID(it->cluster))
- {
- exfat_error("invalid cluster 0x%x while reading directory",
- it->cluster);
- return 1;
- }
- exfat_pread(ef->dev, it->chunk, CLUSTER_SIZE(*ef->sb),
- exfat_c2o(ef, it->cluster));
- }
- return 0;
-}
-
-static struct exfat_node* allocate_node(void)
-{
- struct exfat_node* node = malloc(sizeof(struct exfat_node));
- if (node == NULL)
- {
- exfat_error("failed to allocate node");
- return NULL;
- }
- memset(node, 0, sizeof(struct exfat_node));
- return node;
-}
-
-static void init_node_meta1(struct exfat_node* node,
- const struct exfat_entry_meta1* meta1)
-{
- node->flags = le16_to_cpu(meta1->attrib);
- node->mtime = exfat_exfat2unix(meta1->mdate, meta1->mtime,
- meta1->mtime_cs);
- /* there is no centiseconds field for atime */
- node->atime = exfat_exfat2unix(meta1->adate, meta1->atime, 0);
-}
-
-static void init_node_meta2(struct exfat_node* node,
- const struct exfat_entry_meta2* meta2)
-{
- node->size = le64_to_cpu(meta2->size);
- node->start_cluster = le32_to_cpu(meta2->start_cluster);
- node->fptr_cluster = node->start_cluster;
- if (meta2->flags & EXFAT_FLAG_CONTIGUOUS)
- node->flags |= EXFAT_ATTRIB_CONTIGUOUS;
-}
-
-static const struct exfat_entry* get_entry_ptr(const struct exfat* ef,
- const struct iterator* it)
-{
- return (const struct exfat_entry*)
- (it->chunk + it->offset % CLUSTER_SIZE(*ef->sb));
-}
-
-/*
- * Reads one entry in directory at position pointed by iterator and fills
- * node structure.
- */
-static int readdir(struct exfat* ef, const struct exfat_node* parent,
- struct exfat_node** node, struct iterator* it)
-{
- int rc = -EIO;
- const struct exfat_entry* entry;
- const struct exfat_entry_meta1* meta1;
- const struct exfat_entry_meta2* meta2;
- const struct exfat_entry_name* file_name;
- const struct exfat_entry_upcase* upcase;
- const struct exfat_entry_bitmap* bitmap;
- const struct exfat_entry_label* label;
- uint8_t continuations = 0;
- le16_t* namep = NULL;
- uint16_t reference_checksum = 0;
- uint16_t actual_checksum = 0;
- uint64_t real_size = 0;
-
- *node = NULL;
-
- for (;;)
- {
- if (it->offset >= parent->size)
- {
- if (continuations != 0)
- {
- exfat_error("expected %hhu continuations", continuations);
- goto error;
- }
- return -ENOENT; /* that's OK, means end of directory */
- }
-
- entry = get_entry_ptr(ef, it);
- switch (entry->type)
- {
- case EXFAT_ENTRY_FILE:
- if (continuations != 0)
- {
- exfat_error("expected %hhu continuations before new entry",
- continuations);
- goto error;
- }
- meta1 = (const struct exfat_entry_meta1*) entry;
- continuations = meta1->continuations;
- /* each file entry must have at least 2 continuations:
- info and name */
- if (continuations < 2)
- {
- exfat_error("too few continuations (%hhu)", continuations);
- goto error;
- }
- reference_checksum = le16_to_cpu(meta1->checksum);
- actual_checksum = exfat_start_checksum(meta1);
- *node = allocate_node();
- if (*node == NULL)
- {
- rc = -ENOMEM;
- goto error;
- }
- /* new node has zero reference counter */
- (*node)->entry_cluster = it->cluster;
- (*node)->entry_offset = it->offset;
- init_node_meta1(*node, meta1);
- namep = (*node)->name;
- break;
-
- case EXFAT_ENTRY_FILE_INFO:
- if (continuations < 2)
- {
- exfat_error("unexpected continuation (%hhu)",
- continuations);
- goto error;
- }
- meta2 = (const struct exfat_entry_meta2*) entry;
- if (meta2->flags & ~(EXFAT_FLAG_ALWAYS1 | EXFAT_FLAG_CONTIGUOUS))
- {
- exfat_error("unknown flags in meta2 (0x%hhx)", meta2->flags);
- goto error;
- }
- init_node_meta2(*node, meta2);
- actual_checksum = exfat_add_checksum(entry, actual_checksum);
- real_size = le64_to_cpu(meta2->real_size);
- /* empty files must be marked as non-contiguous */
- if ((*node)->size == 0 && (meta2->flags & EXFAT_FLAG_CONTIGUOUS))
- {
- exfat_error("empty file marked as contiguous (0x%hhx)",
- meta2->flags);
- goto error;
- }
- /* directories must be aligned on at cluster boundary */
- if (((*node)->flags & EXFAT_ATTRIB_DIR) &&
- (*node)->size % CLUSTER_SIZE(*ef->sb) != 0)
- {
- exfat_error("directory has invalid size %"PRIu64" bytes",
- (*node)->size);
- goto error;
- }
- --continuations;
- break;
-
- case EXFAT_ENTRY_FILE_NAME:
- if (continuations == 0)
- {
- exfat_error("unexpected continuation");
- goto error;
- }
- file_name = (const struct exfat_entry_name*) entry;
- actual_checksum = exfat_add_checksum(entry, actual_checksum);
-
- memcpy(namep, file_name->name, EXFAT_ENAME_MAX * sizeof(le16_t));
- namep += EXFAT_ENAME_MAX;
- if (--continuations == 0)
- {
- /*
- There are two fields that contain file size. Maybe they
- plan to add compression support in the future and one of
- those fields is visible (uncompressed) size and the other
- is real (compressed) size. Anyway, currently it looks like
- exFAT does not support compression and both fields must be
- equal.
-
- There is an exception though: pagefile.sys (its real_size
- is always 0).
- */
- if (real_size != (*node)->size)
- {
- char buffer[EXFAT_NAME_MAX + 1];
-
- exfat_get_name(*node, buffer, EXFAT_NAME_MAX);
- exfat_error("`%s' real size does not equal to size "
- "(%"PRIu64" != %"PRIu64")", buffer,
- real_size, (*node)->size);
- goto error;
- }
- if (actual_checksum != reference_checksum)
- {
- char buffer[EXFAT_NAME_MAX + 1];
-
- exfat_get_name(*node, buffer, EXFAT_NAME_MAX);
- exfat_error("`%s' has invalid checksum (0x%hx != 0x%hx)",
- buffer, actual_checksum, reference_checksum);
- goto error;
- }
- if (fetch_next_entry(ef, parent, it) != 0)
- goto error;
- return 0; /* entry completed */
- }
- break;
-
- case EXFAT_ENTRY_UPCASE:
- if (ef->upcase != NULL)
- break;
- upcase = (const struct exfat_entry_upcase*) entry;
- if (CLUSTER_INVALID(le32_to_cpu(upcase->start_cluster)))
- {
- exfat_error("invalid cluster 0x%x in upcase table",
- le32_to_cpu(upcase->start_cluster));
- goto error;
- }
- if (le64_to_cpu(upcase->size) == 0 ||
- le64_to_cpu(upcase->size) > 0xffff * sizeof(uint16_t) ||
- le64_to_cpu(upcase->size) % sizeof(uint16_t) != 0)
- {
- exfat_error("bad upcase table size (%"PRIu64" bytes)",
- le64_to_cpu(upcase->size));
- goto error;
- }
- ef->upcase = malloc(le64_to_cpu(upcase->size));
- if (ef->upcase == NULL)
- {
- exfat_error("failed to allocate upcase table (%"PRIu64" bytes)",
- le64_to_cpu(upcase->size));
- rc = -ENOMEM;
- goto error;
- }
- ef->upcase_chars = le64_to_cpu(upcase->size) / sizeof(le16_t);
-
- exfat_pread(ef->dev, ef->upcase, le64_to_cpu(upcase->size),
- exfat_c2o(ef, le32_to_cpu(upcase->start_cluster)));
- break;
-
- case EXFAT_ENTRY_BITMAP:
- bitmap = (const struct exfat_entry_bitmap*) entry;
- ef->cmap.start_cluster = le32_to_cpu(bitmap->start_cluster);
- if (CLUSTER_INVALID(ef->cmap.start_cluster))
- {
- exfat_error("invalid cluster 0x%x in clusters bitmap",
- ef->cmap.start_cluster);
- goto error;
- }
- ef->cmap.size = le32_to_cpu(ef->sb->cluster_count) -
- EXFAT_FIRST_DATA_CLUSTER;
- if (le64_to_cpu(bitmap->size) < (ef->cmap.size + 7) / 8)
- {
- exfat_error("invalid clusters bitmap size: %"PRIu64
- " (expected at least %u)",
- le64_to_cpu(bitmap->size), (ef->cmap.size + 7) / 8);
- goto error;
- }
- /* FIXME bitmap can be rather big, up to 512 MB */
- ef->cmap.chunk_size = ef->cmap.size;
- ef->cmap.chunk = malloc(le64_to_cpu(bitmap->size));
- if (ef->cmap.chunk == NULL)
- {
- exfat_error("failed to allocate clusters bitmap chunk "
- "(%"PRIu64" bytes)", le64_to_cpu(bitmap->size));
- rc = -ENOMEM;
- goto error;
- }
-
- exfat_pread(ef->dev, ef->cmap.chunk, le64_to_cpu(bitmap->size),
- exfat_c2o(ef, ef->cmap.start_cluster));
- break;
-
- case EXFAT_ENTRY_LABEL:
- label = (const struct exfat_entry_label*) entry;
- if (label->length > EXFAT_ENAME_MAX)
- {
- exfat_error("too long label (%hhu chars)", label->length);
- goto error;
- }
- if (utf16_to_utf8(ef->label, label->name,
- sizeof(ef->label), EXFAT_ENAME_MAX) != 0)
- goto error;
- break;
-
- default:
- if (entry->type & EXFAT_ENTRY_VALID)
- {
- exfat_error("unknown entry type 0x%hhx", entry->type);
- goto error;
- }
- break;
- }
-
- if (fetch_next_entry(ef, parent, it) != 0)
- goto error;
- }
- /* we never reach here */
-
-error:
- free(*node);
- *node = NULL;
- return rc;
-}
-
-int exfat_cache_directory(struct exfat* ef, struct exfat_node* dir)
-{
- struct iterator it;
- int rc;
- struct exfat_node* node;
- struct exfat_node* current = NULL;
-
- if (dir->flags & EXFAT_ATTRIB_CACHED)
- return 0; /* already cached */
-
- rc = opendir(ef, dir, &it);
- if (rc != 0)
- return rc;
- while ((rc = readdir(ef, dir, &node, &it)) == 0)
- {
- node->parent = dir;
- if (current != NULL)
- {
- current->next = node;
- node->prev = current;
- }
- else
- dir->child = node;
-
- current = node;
- }
- closedir(&it);
-
- if (rc != -ENOENT)
- {
- /* rollback */
- for (current = dir->child; current; current = node)
- {
- node = current->next;
- free(current);
- }
- dir->child = NULL;
- return rc;
- }
-
- dir->flags |= EXFAT_ATTRIB_CACHED;
- return 0;
-}
-
-static void tree_attach(struct exfat_node* dir, struct exfat_node* node)
-{
- node->parent = dir;
- if (dir->child)
- {
- dir->child->prev = node;
- node->next = dir->child;
- }
- dir->child = node;
-}
-
-static void tree_detach(struct exfat_node* node)
-{
- if (node->prev)
- node->prev->next = node->next;
- else /* this is the first node in the list */
- node->parent->child = node->next;
- if (node->next)
- node->next->prev = node->prev;
- node->parent = NULL;
- node->prev = NULL;
- node->next = NULL;
-}
-
-static void reset_cache(struct exfat* ef, struct exfat_node* node)
-{
- while (node->child)
- {
- struct exfat_node* p = node->child;
- reset_cache(ef, p);
- tree_detach(p);
- free(p);
- }
- node->flags &= ~EXFAT_ATTRIB_CACHED;
- if (node->references != 0)
- {
- char buffer[EXFAT_NAME_MAX + 1];
- exfat_get_name(node, buffer, EXFAT_NAME_MAX);
- exfat_warn("non-zero reference counter (%d) for `%s'",
- node->references, buffer);
- }
- while (node->references)
- exfat_put_node(ef, node);
-}
-
-void exfat_reset_cache(struct exfat* ef)
-{
- reset_cache(ef, ef->root);
-}
-
-void next_entry(struct exfat* ef, const struct exfat_node* parent,
- cluster_t* cluster, off64_t* offset)
-{
- *offset += sizeof(struct exfat_entry);
- if (*offset % CLUSTER_SIZE(*ef->sb) == 0)
- /* next cluster cannot be invalid */
- *cluster = exfat_next_cluster(ef, parent, *cluster);
-}
-
-void exfat_flush_node(struct exfat* ef, struct exfat_node* node)
-{
- cluster_t cluster;
- off64_t offset;
- off64_t meta1_offset, meta2_offset;
- struct exfat_entry_meta1 meta1;
- struct exfat_entry_meta2 meta2;
-
- if (ef->ro)
- exfat_bug("unable to flush node to read-only FS");
-
- if (node->parent == NULL)
- return; /* do not flush unlinked node */
-
- cluster = node->entry_cluster;
- offset = node->entry_offset;
- meta1_offset = co2o(ef, cluster, offset);
- next_entry(ef, node->parent, &cluster, &offset);
- meta2_offset = co2o(ef, cluster, offset);
-
- exfat_pread(ef->dev, &meta1, sizeof(meta1), meta1_offset);
- if (meta1.type != EXFAT_ENTRY_FILE)
- exfat_bug("invalid type of meta1: 0x%hhx", meta1.type);
- meta1.attrib = cpu_to_le16(node->flags);
- exfat_unix2exfat(node->mtime, &meta1.mdate, &meta1.mtime, &meta1.mtime_cs);
- exfat_unix2exfat(node->atime, &meta1.adate, &meta1.atime, NULL);
-
- exfat_pread(ef->dev, &meta2, sizeof(meta2), meta2_offset);
- if (meta2.type != EXFAT_ENTRY_FILE_INFO)
- exfat_bug("invalid type of meta2: 0x%hhx", meta2.type);
- meta2.size = meta2.real_size = cpu_to_le64(node->size);
- meta2.start_cluster = cpu_to_le32(node->start_cluster);
- meta2.flags = EXFAT_FLAG_ALWAYS1;
- /* empty files must not be marked as contiguous */
- if (node->size != 0 && IS_CONTIGUOUS(*node))
- meta2.flags |= EXFAT_FLAG_CONTIGUOUS;
- /* name hash remains unchanged, no need to recalculate it */
-
- meta1.checksum = exfat_calc_checksum(&meta1, &meta2, node->name);
-
- exfat_pwrite(ef->dev, &meta1, sizeof(meta1), meta1_offset);
- exfat_pwrite(ef->dev, &meta2, sizeof(meta2), meta2_offset);
-
- node->flags &= ~EXFAT_ATTRIB_DIRTY;
-}
-
-static void erase_entry(struct exfat* ef, struct exfat_node* node)
-{
- cluster_t cluster = node->entry_cluster;
- off64_t offset = node->entry_offset;
- int name_entries = DIV_ROUND_UP(utf16_length(node->name), EXFAT_ENAME_MAX);
- uint8_t entry_type;
-
- entry_type = EXFAT_ENTRY_FILE & ~EXFAT_ENTRY_VALID;
- exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset));
-
- next_entry(ef, node->parent, &cluster, &offset);
- entry_type = EXFAT_ENTRY_FILE_INFO & ~EXFAT_ENTRY_VALID;
- exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset));
-
- while (name_entries--)
- {
- next_entry(ef, node->parent, &cluster, &offset);
- entry_type = EXFAT_ENTRY_FILE_NAME & ~EXFAT_ENTRY_VALID;
- exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset));
- }
-}
-
-static int shrink_directory(struct exfat* ef, struct exfat_node* dir,
- off64_t deleted_offset)
-{
- const struct exfat_node* node;
- const struct exfat_node* last_node;
- uint64_t entries = 0;
- uint64_t new_size;
- int rc;
-
- if (!(dir->flags & EXFAT_ATTRIB_DIR))
- exfat_bug("attempted to shrink a file");
- if (!(dir->flags & EXFAT_ATTRIB_CACHED))
- exfat_bug("attempted to shrink uncached directory");
-
- for (last_node = node = dir->child; node; node = node->next)
- {
- if (deleted_offset < node->entry_offset)
- {
- /* there are other entries after the removed one, no way to shrink
- this directory */
- return 0;
- }
- if (last_node->entry_offset < node->entry_offset)
- last_node = node;
- }
-
- if (last_node)
- {
- /* offset of the last entry */
- entries += last_node->entry_offset / sizeof(struct exfat_entry);
- /* two subentries with meta info */
- entries += 2;
- /* subentries with file name */
- entries += DIV_ROUND_UP(utf16_length(last_node->name),
- EXFAT_ENAME_MAX);
- }
-
- new_size = DIV_ROUND_UP(entries * sizeof(struct exfat_entry),
- CLUSTER_SIZE(*ef->sb)) * CLUSTER_SIZE(*ef->sb);
- if (new_size == 0) /* directory always has at least 1 cluster */
- new_size = CLUSTER_SIZE(*ef->sb);
- if (new_size == dir->size)
- return 0;
- rc = exfat_truncate(ef, dir, new_size);
- if (rc != 0)
- return rc;
- return 0;
-}
-
-static int delete(struct exfat* ef, struct exfat_node* node)
-{
- struct exfat_node* parent = node->parent;
- off64_t deleted_offset = node->entry_offset;
- int rc;
-
- exfat_get_node(parent);
- erase_entry(ef, node);
- exfat_update_mtime(parent);
- tree_detach(node);
- rc = shrink_directory(ef, parent, deleted_offset);
- exfat_put_node(ef, parent);
- /* file clusters will be freed when node reference counter becomes 0 */
- node->flags |= EXFAT_ATTRIB_UNLINKED;
- return rc;
-}
-
-int exfat_unlink(struct exfat* ef, struct exfat_node* node)
-{
- if (node->flags & EXFAT_ATTRIB_DIR)
- return -EISDIR;
- return delete(ef, node);
-}
-
-int exfat_rmdir(struct exfat* ef, struct exfat_node* node)
-{
- if (!(node->flags & EXFAT_ATTRIB_DIR))
- return -ENOTDIR;
- /* check that directory is empty */
- exfat_cache_directory(ef, node);
- if (node->child)
- return -ENOTEMPTY;
- return delete(ef, node);
-}
-
-static int grow_directory(struct exfat* ef, struct exfat_node* dir,
- uint64_t asize, uint32_t difference)
-{
- return exfat_truncate(ef, dir,
- DIV_ROUND_UP(asize + difference, CLUSTER_SIZE(*ef->sb))
- * CLUSTER_SIZE(*ef->sb));
-}
-
-static int find_slot(struct exfat* ef, struct exfat_node* dir,
- cluster_t* cluster, off64_t* offset, int subentries)
-{
- struct iterator it;
- int rc;
- const struct exfat_entry* entry;
- int contiguous = 0;
-
- rc = opendir(ef, dir, &it);
- if (rc != 0)
- return rc;
- for (;;)
- {
- if (contiguous == 0)
- {
- *cluster = it.cluster;
- *offset = it.offset;
- }
- entry = get_entry_ptr(ef, &it);
- if (entry->type & EXFAT_ENTRY_VALID)
- contiguous = 0;
- else
- contiguous++;
- if (contiguous == subentries)
- break; /* suitable slot is found */
- if (it.offset + sizeof(struct exfat_entry) >= dir->size)
- {
- rc = grow_directory(ef, dir, dir->size,
- (subentries - contiguous) * sizeof(struct exfat_entry));
- if (rc != 0)
- {
- closedir(&it);
- return rc;
- }
- }
- if (fetch_next_entry(ef, dir, &it) != 0)
- {
- closedir(&it);
- return -EIO;
- }
- }
- closedir(&it);
- return 0;
-}
-
-static int write_entry(struct exfat* ef, struct exfat_node* dir,
- const le16_t* name, cluster_t cluster, off64_t offset, uint16_t attrib)
-{
- struct exfat_node* node;
- struct exfat_entry_meta1 meta1;
- struct exfat_entry_meta2 meta2;
- const size_t name_length = utf16_length(name);
- const int name_entries = DIV_ROUND_UP(name_length, EXFAT_ENAME_MAX);
- int i;
-
- node = allocate_node();
- if (node == NULL)
- return -ENOMEM;
- node->entry_cluster = cluster;
- node->entry_offset = offset;
- memcpy(node->name, name, name_length * sizeof(le16_t));
-
- memset(&meta1, 0, sizeof(meta1));
- meta1.type = EXFAT_ENTRY_FILE;
- meta1.continuations = 1 + name_entries;
- meta1.attrib = cpu_to_le16(attrib);
- exfat_unix2exfat(time(NULL), &meta1.crdate, &meta1.crtime,
- &meta1.crtime_cs);
- meta1.adate = meta1.mdate = meta1.crdate;
- meta1.atime = meta1.mtime = meta1.crtime;
- meta1.mtime_cs = meta1.crtime_cs; /* there is no atime_cs */
-
- memset(&meta2, 0, sizeof(meta2));
- meta2.type = EXFAT_ENTRY_FILE_INFO;
- meta2.flags = EXFAT_FLAG_ALWAYS1;
- meta2.name_length = name_length;
- meta2.name_hash = exfat_calc_name_hash(ef, node->name);
- meta2.start_cluster = cpu_to_le32(EXFAT_CLUSTER_FREE);
-
- meta1.checksum = exfat_calc_checksum(&meta1, &meta2, node->name);
-
- exfat_pwrite(ef->dev, &meta1, sizeof(meta1), co2o(ef, cluster, offset));
- next_entry(ef, dir, &cluster, &offset);
- exfat_pwrite(ef->dev, &meta2, sizeof(meta2), co2o(ef, cluster, offset));
- for (i = 0; i < name_entries; i++)
- {
- struct exfat_entry_name name_entry = {EXFAT_ENTRY_FILE_NAME, 0};
- memcpy(name_entry.name, node->name + i * EXFAT_ENAME_MAX,
- EXFAT_ENAME_MAX * sizeof(le16_t));
- next_entry(ef, dir, &cluster, &offset);
- exfat_pwrite(ef->dev, &name_entry, sizeof(name_entry),
- co2o(ef, cluster, offset));
- }
-
- init_node_meta1(node, &meta1);
- init_node_meta2(node, &meta2);
-
- tree_attach(dir, node);
- exfat_update_mtime(dir);
- return 0;
-}
-
-static int create(struct exfat* ef, const char* path, uint16_t attrib)
-{
- struct exfat_node* dir;
- struct exfat_node* existing;
- cluster_t cluster = EXFAT_CLUSTER_BAD;
- off64_t offset = -1;
- le16_t name[EXFAT_NAME_MAX + 1];
- int rc;
-
- rc = exfat_split(ef, &dir, &existing, name, path);
- if (rc != 0)
- return rc;
- if (existing != NULL)
- {
- exfat_put_node(ef, existing);
- exfat_put_node(ef, dir);
- return -EEXIST;
- }
-
- rc = find_slot(ef, dir, &cluster, &offset,
- 2 + DIV_ROUND_UP(utf16_length(name), EXFAT_ENAME_MAX));
- if (rc != 0)
- {
- exfat_put_node(ef, dir);
- return rc;
- }
- rc = write_entry(ef, dir, name, cluster, offset, attrib);
- exfat_put_node(ef, dir);
- return rc;
-}
-
-int exfat_mknod(struct exfat* ef, const char* path)
-{
- return create(ef, path, EXFAT_ATTRIB_ARCH);
-}
-
-int exfat_mkdir(struct exfat* ef, const char* path)
-{
- int rc;
- struct exfat_node* node;
-
- rc = create(ef, path, EXFAT_ATTRIB_ARCH | EXFAT_ATTRIB_DIR);
- if (rc != 0)
- return rc;
- rc = exfat_lookup(ef, &node, path);
- if (rc != 0)
- return 0;
- /* directories always have at least one cluster */
- rc = exfat_truncate(ef, node, CLUSTER_SIZE(*ef->sb));
- if (rc != 0)
- {
- delete(ef, node);
- exfat_put_node(ef, node);
- return rc;
- }
- exfat_put_node(ef, node);
- return 0;
-}
-
-static void rename_entry(struct exfat* ef, struct exfat_node* dir,
- struct exfat_node* node, const le16_t* name, cluster_t new_cluster,
- off64_t new_offset)
-{
- struct exfat_entry_meta1 meta1;
- struct exfat_entry_meta2 meta2;
- cluster_t old_cluster = node->entry_cluster;
- off64_t old_offset = node->entry_offset;
- const size_t name_length = utf16_length(name);
- const int name_entries = DIV_ROUND_UP(name_length, EXFAT_ENAME_MAX);
- int i;
-
- exfat_pread(ef->dev, &meta1, sizeof(meta1),
- co2o(ef, old_cluster, old_offset));
- next_entry(ef, node->parent, &old_cluster, &old_offset);
- exfat_pread(ef->dev, &meta2, sizeof(meta2),
- co2o(ef, old_cluster, old_offset));
- meta1.continuations = 1 + name_entries;
- meta2.name_hash = exfat_calc_name_hash(ef, name);
- meta2.name_length = name_length;
- meta1.checksum = exfat_calc_checksum(&meta1, &meta2, name);
-
- erase_entry(ef, node);
-
- node->entry_cluster = new_cluster;
- node->entry_offset = new_offset;
-
- exfat_pwrite(ef->dev, &meta1, sizeof(meta1),
- co2o(ef, new_cluster, new_offset));
- next_entry(ef, dir, &new_cluster, &new_offset);
- exfat_pwrite(ef->dev, &meta2, sizeof(meta2),
- co2o(ef, new_cluster, new_offset));
-
- for (i = 0; i < name_entries; i++)
- {
- struct exfat_entry_name name_entry = {EXFAT_ENTRY_FILE_NAME, 0};
- memcpy(name_entry.name, name + i * EXFAT_ENAME_MAX,
- EXFAT_ENAME_MAX * sizeof(le16_t));
- next_entry(ef, dir, &new_cluster, &new_offset);
- exfat_pwrite(ef->dev, &name_entry, sizeof(name_entry),
- co2o(ef, new_cluster, new_offset));
- }
-
- memcpy(node->name, name, (EXFAT_NAME_MAX + 1) * sizeof(le16_t));
- tree_detach(node);
- tree_attach(dir, node);
-}
-
-int exfat_rename(struct exfat* ef, const char* old_path, const char* new_path)
-{
- struct exfat_node* node;
- struct exfat_node* existing;
- struct exfat_node* dir;
- cluster_t cluster = EXFAT_CLUSTER_BAD;
- off64_t offset = -1;
- le16_t name[EXFAT_NAME_MAX + 1];
- int rc;
-
- rc = exfat_lookup(ef, &node, old_path);
- if (rc != 0)
- return rc;
-
- rc = exfat_split(ef, &dir, &existing, name, new_path);
- if (rc != 0)
- {
- exfat_put_node(ef, node);
- return rc;
- }
- if (existing != NULL)
- {
- /* remove target if it's not the same node as source */
- if (existing != node)
- {
- if (existing->flags & EXFAT_ATTRIB_DIR)
- {
- if (node->flags & EXFAT_ATTRIB_DIR)
- rc = exfat_rmdir(ef, existing);
- else
- rc = -ENOTDIR;
- }
- else
- {
- if (!(node->flags & EXFAT_ATTRIB_DIR))
- rc = exfat_unlink(ef, existing);
- else
- rc = -EISDIR;
- }
- exfat_put_node(ef, existing);
- if (rc != 0)
- {
- exfat_put_node(ef, dir);
- exfat_put_node(ef, node);
- return rc;
- }
- }
- else
- exfat_put_node(ef, existing);
- }
-
- rc = find_slot(ef, dir, &cluster, &offset,
- 2 + DIV_ROUND_UP(utf16_length(name), EXFAT_ENAME_MAX));
- if (rc != 0)
- {
- exfat_put_node(ef, dir);
- exfat_put_node(ef, node);
- return rc;
- }
- rename_entry(ef, dir, node, name, cluster, offset);
- exfat_put_node(ef, dir);
- exfat_put_node(ef, node);
- return 0;
-}
-
-void exfat_utimes(struct exfat_node* node, const struct timespec tv[2])
-{
- node->atime = tv[0].tv_sec;
- node->mtime = tv[1].tv_sec;
- node->flags |= EXFAT_ATTRIB_DIRTY;
-}
-
-void exfat_update_atime(struct exfat_node* node)
-{
- node->atime = time(NULL);
- node->flags |= EXFAT_ATTRIB_DIRTY;
-}
-
-void exfat_update_mtime(struct exfat_node* node)
-{
- node->mtime = time(NULL);
- node->flags |= EXFAT_ATTRIB_DIRTY;
-}
-
-const char* exfat_get_label(struct exfat* ef)
-{
- return ef->label;
-}
-
-static int find_label(struct exfat* ef, cluster_t* cluster, off64_t* offset)
-{
- struct iterator it;
- int rc;
-
- rc = opendir(ef, ef->root, &it);
- if (rc != 0)
- return rc;
-
- for (;;)
- {
- if (it.offset >= ef->root->size)
- {
- closedir(&it);
- return -ENOENT;
- }
-
- if (get_entry_ptr(ef, &it)->type == EXFAT_ENTRY_LABEL)
- {
- *cluster = it.cluster;
- *offset = it.offset;
- closedir(&it);
- return 0;
- }
-
- if (fetch_next_entry(ef, ef->root, &it) != 0)
- {
- closedir(&it);
- return -EIO;
- }
- }
-}
-
-int exfat_set_label(struct exfat* ef, const char* label)
-{
- le16_t label_utf16[EXFAT_ENAME_MAX + 1];
- int rc;
- cluster_t cluster;
- off64_t offset;
- struct exfat_entry_label entry;
-
- memset(label_utf16, 0, sizeof(label_utf16));
- rc = utf8_to_utf16(label_utf16, label, EXFAT_ENAME_MAX, strlen(label));
- if (rc != 0)
- return rc;
-
- rc = find_label(ef, &cluster, &offset);
- if (rc == -ENOENT)
- rc = find_slot(ef, ef->root, &cluster, &offset, 1);
- if (rc != 0)
- return rc;
-
- entry.type = EXFAT_ENTRY_LABEL;
- entry.length = utf16_length(label_utf16);
- memcpy(entry.name, label_utf16, sizeof(entry.name));
- if (entry.length == 0)
- entry.type ^= EXFAT_ENTRY_VALID;
-
- exfat_pwrite(ef->dev, &entry, sizeof(struct exfat_entry_label),
- co2o(ef, cluster, offset));
- return 0;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-03 21:53:40 +0100