Changeset 9b9d37bb in mainline for uspace/srv/fs/ext4fs/ext4fs_ops.c

Timestamp:

2011-10-06T09:48:53Z (14 years ago)

Author:

Frantisek Princ <frantisek.princ@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

1114173

Parents:

3712434

Message:

mounting + list of mounted directory (ported from ext2) - many TODO remaining

File:

• uspace/srv/fs/ext4fs/ext4fs_ops.c (modified) (26 diffs)

uspace/srv/fs/ext4fs/ext4fs_ops.c

@@ -40 +40 @@
 #include <libext4.h>
 #include <libfs.h>
+#include <macros.h>
 #include <malloc.h>
-#include <stdio.h>
 #include <adt/hash_table.h>
 #include <ipc/loc.h>
@@ -48 +48 @@
 
 #define EXT4FS_NODE(node)       ((node) ? (ext4fs_node_t *) (node)->data : NULL)
-#define EXT4FS_DBG(format, ...) {if (true) printf("ext4fs: %s: " format "\n", __FUNCTION__, ##__VA_ARGS__);}
 
 #define OPEN_NODES_KEYS 2
@@ -73 +72 @@
  * Forward declarations of auxiliary functions
  */
+
+static int ext4fs_read_directory(ipc_callid_t, aoff64_t, size_t,
+    ext4fs_instance_t *, ext4_inode_ref_t *, size_t *);
+static int ext4fs_read_file(ipc_callid_t, aoff64_t, size_t, ext4fs_instance_t *,
+    ext4_inode_ref_t *, size_t *);
+static bool ext4fs_is_dots(const uint8_t *, size_t);
 static int ext4fs_instance_get(service_id_t, ext4fs_instance_t **);
 static int ext4fs_node_get_core(fs_node_t **, ext4fs_instance_t *, fs_index_t);
@@ -142 +147 @@
 int ext4fs_global_init(void)
 {
+        EXT4FS_DBG("");
+
         if (!hash_table_create(&open_nodes, OPEN_NODES_BUCKETS,
             OPEN_NODES_KEYS, &open_nodes_ops)) {
@@ -152 +159 @@
 int ext4fs_global_fini(void)
 {
+        EXT4FS_DBG("");
+
         hash_table_destroy(&open_nodes);
         return EOK;
@@ -169 +178 @@
         fibril_mutex_lock(&instance_list_mutex);
 
-        EXT4FS_DBG("Checking lists");
-
         if (list_empty(&instance_list)) {
                 fibril_mutex_unlock(&instance_list_mutex);
                 return EINVAL;
         }
-
-        EXT4FS_DBG("checked");
 
         list_foreach(instance_list, link) {
@@ -188 +193 @@
         }
 
-        EXT4FS_DBG("Not found");
-
         fibril_mutex_unlock(&instance_list_mutex);
         return EINVAL;
@@ -197 +200 @@
 int ext4fs_root_get(fs_node_t **rfn, service_id_t service_id)
 {
+        EXT4FS_DBG("");
+
         return ext4fs_node_get(rfn, service_id, EXT4_INODE_ROOT_INDEX);
 }
@@ -203 +208 @@
 int ext4fs_match(fs_node_t **rfn, fs_node_t *pfn, const char *component)
 {
-        // TODO
+        EXT4FS_DBG("");
+
+        ext4fs_node_t *eparent = EXT4FS_NODE(pfn);
+        ext4_filesystem_t *fs;
+        ext4_directory_iterator_t it;
+        int rc;
+        size_t name_size;
+        size_t component_size;
+        bool found = false;
+        uint32_t inode;
+
+        fs = eparent->instance->filesystem;
+
+        if (!ext4_inode_is_type(fs->superblock, eparent->inode_ref->inode,
+            EXT4_INODE_MODE_DIRECTORY)) {
+                return ENOTDIR;
+        }
+
+        rc = ext4_directory_iterator_init(&it, fs, eparent->inode_ref, 0);
+        if (rc != EOK) {
+                return rc;
+        }
+
+        /* Find length of component in bytes
+         * TODO: check for library function call that does this
+         */
+        component_size = 0;
+        while (*(component+component_size) != 0) {
+                component_size++;
+        }
+
+        while (it.current != NULL) {
+                inode = ext4_directory_entry_ll_get_inode(it.current);
+
+                /* ignore empty directory entries */
+                if (inode != 0) {
+                        name_size = ext4_directory_entry_ll_get_name_length(fs->superblock,
+                                it.current);
+
+                        if (name_size == component_size && bcmp(component, &it.current->name,
+                                    name_size) == 0) {
+                                rc = ext4fs_node_get_core(rfn, eparent->instance,
+                                        inode);
+                                if (rc != EOK) {
+                                        ext4_directory_iterator_fini(&it);
+                                        return rc;
+                                }
+                                found = true;
+                                break;
+                        }
+                }
+
+                rc = ext4_directory_iterator_next(&it);
+                if (rc != EOK) {
+                        ext4_directory_iterator_fini(&it);
+                        return rc;
+                }
+        }
+
+        ext4_directory_iterator_fini(&it);
+
+        if (!found) {
+                return ENOENT;
+        }
+
         return EOK;
 }
@@ -225 +294 @@
                 fs_index_t index)
 {
-
         int rc;
         fs_node_t *node = NULL;
@@ -290 +358 @@
 
 
-int ext4fs_node_put_core(ext4fs_node_t *enode) {
-        // TODO
+int ext4fs_node_put_core(ext4fs_node_t *enode)
+{
+        int rc;
+        unsigned long key[] = {
+                [OPEN_NODES_DEV_HANDLE_KEY] = enode->instance->service_id,
+                [OPEN_NODES_INODE_KEY] = enode->inode_ref->index,
+        };
+
+        hash_table_remove(&open_nodes, key, OPEN_NODES_KEYS);
+        assert(enode->instance->open_nodes_count > 0);
+        enode->instance->open_nodes_count--;
+
+        rc = ext4_filesystem_put_inode_ref(enode->inode_ref);
+        if (rc != EOK) {
+                return rc;
+        }
+
+        free(enode->fs_node);
+        free(enode);
+
         return EOK;
 }
@@ -304 +390 @@
 int ext4fs_node_put(fs_node_t *fn)
 {
-        EXT4FS_DBG("");
         int rc;
         ext4fs_node_t *enode = EXT4FS_NODE(fn);
@@ -328 +413 @@
 int ext4fs_create_node(fs_node_t **rfn, service_id_t service_id, int flags)
 {
+        EXT4FS_DBG("");
+
         // TODO
         return ENOTSUP;
@@ -335 +422 @@
 int ext4fs_destroy_node(fs_node_t *fn)
 {
+        EXT4FS_DBG("");
+
         // TODO
         return ENOTSUP;
@@ -342 +431 @@
 int ext4fs_link(fs_node_t *pfn, fs_node_t *cfn, const char *name)
 {
+        EXT4FS_DBG("");
+
         // TODO
         return ENOTSUP;
@@ -349 +440 @@
 int ext4fs_unlink(fs_node_t *pfn, fs_node_t *cfn, const char *nm)
 {
+        EXT4FS_DBG("");
+
         // TODO
         return ENOTSUP;
@@ -356 +449 @@
 int ext4fs_has_children(bool *has_children, fs_node_t *fn)
 {
+        EXT4FS_DBG("");
+
         // TODO
         return EOK;
@@ -363 +458 @@
 fs_index_t ext4fs_index_get(fs_node_t *fn)
 {
-        // TODO
-        return 0;
+        ext4fs_node_t *enode = EXT4FS_NODE(fn);
+        return enode->inode_ref->index;
 }
 
@@ -370 +465 @@
 aoff64_t ext4fs_size_get(fs_node_t *fn)
 {
-        // TODO
-        return 0;
+        ext4fs_node_t *enode = EXT4FS_NODE(fn);
+        aoff64_t size = ext4_inode_get_size(enode->instance->filesystem->superblock,
+            enode->inode_ref->inode);
+        return size;
 }
 
@@ -377 +474 @@
 unsigned ext4fs_lnkcnt_get(fs_node_t *fn)
 {
-        // TODO
-        return 0;
+        ext4fs_node_t *enode = EXT4FS_NODE(fn);
+        unsigned count = ext4_inode_get_links_count(enode->inode_ref->inode);
+        return count;
 }
 
@@ -384 +482 @@
 bool ext4fs_is_directory(fs_node_t *fn)
 {
+        EXT4FS_DBG("");
+
         // TODO
         return false;
@@ -391 +491 @@
 bool ext4fs_is_file(fs_node_t *fn)
 {
-        // TODO
-        return false;
+        ext4fs_node_t *enode = EXT4FS_NODE(fn);
+        bool is_file = ext4_inode_is_type(enode->instance->filesystem->superblock,
+            enode->inode_ref->inode, EXT4_INODE_MODE_FILE);
+        return is_file;
 }
 
@@ -398 +500 @@
 service_id_t ext4fs_service_get(fs_node_t *fn)
 {
+        EXT4FS_DBG("");
+
         // TODO
         return 0;
@@ -432 +536 @@
    fs_index_t *index, aoff64_t *size, unsigned *lnkcnt)
 {
+        EXT4FS_DBG("");
 
         int rc;
@@ -511 +616 @@
 static int ext4fs_unmounted(service_id_t service_id)
 {
+        EXT4FS_DBG("");
 
         int rc;
@@ -545 +651 @@
     size_t *rbytes)
 {
-        // TODO
-        return 0;
-}
-
+        EXT4FS_DBG("");
+
+        ext4fs_instance_t *inst;
+        ext4_inode_ref_t *inode_ref;
+        int rc;
+
+        /*
+         * Receive the read request.
+         */
+        ipc_callid_t callid;
+        size_t size;
+        if (!async_data_read_receive(&callid, &size)) {
+                async_answer_0(callid, EINVAL);
+                return EINVAL;
+        }
+
+        rc = ext4fs_instance_get(service_id, &inst);
+        if (rc != EOK) {
+                async_answer_0(callid, rc);
+                return rc;
+        }
+
+        rc = ext4_filesystem_get_inode_ref(inst->filesystem, index, &inode_ref);
+        if (rc != EOK) {
+                async_answer_0(callid, rc);
+                return rc;
+        }
+
+        if (ext4_inode_is_type(inst->filesystem->superblock, inode_ref->inode,
+                        EXT4_INODE_MODE_FILE)) {
+                rc = ext4fs_read_file(callid, pos, size, inst, inode_ref,
+                                rbytes);
+        } else if (ext4_inode_is_type(inst->filesystem->superblock,
+                        inode_ref->inode, EXT4_INODE_MODE_DIRECTORY)) {
+                rc = ext4fs_read_directory(callid, pos, size, inst, inode_ref,
+                                rbytes);
+        } else {
+                /* Other inode types not supported */
+                async_answer_0(callid, ENOTSUP);
+                rc = ENOTSUP;
+        }
+
+        ext4_filesystem_put_inode_ref(inode_ref);
+        return rc;
+}
+
+bool ext4fs_is_dots(const uint8_t *name, size_t name_size) {
+        if (name_size == 1 && name[0] == '.') {
+                return true;
+        }
+
+        if (name_size == 2 && name[0] == '.' && name[1] == '.') {
+                return true;
+        }
+
+        return false;
+}
+
+int ext4fs_read_directory(ipc_callid_t callid, aoff64_t pos, size_t size,
+    ext4fs_instance_t *inst, ext4_inode_ref_t *inode_ref, size_t *rbytes)
+{
+        EXT4FS_DBG("");
+
+        ext4_directory_iterator_t it;
+        aoff64_t next;
+        uint8_t *buf;
+        size_t name_size;
+        int rc;
+        bool found = false;
+
+        rc = ext4_directory_iterator_init(&it, inst->filesystem, inode_ref, pos);
+        if (rc != EOK) {
+                async_answer_0(callid, rc);
+                return rc;
+        }
+
+        /* Find next interesting directory entry.
+         * We want to skip . and .. entries
+         * as these are not used in HelenOS
+         */
+        while (it.current != NULL) {
+                if (it.current->inode == 0) {
+                        goto skip;
+                }
+
+                name_size = ext4_directory_entry_ll_get_name_length(
+                    inst->filesystem->superblock, it.current);
+
+                /* skip . and .. */
+                if (ext4fs_is_dots(&it.current->name, name_size)) {
+                        goto skip;
+                }
+
+                /* The on-disk entry does not contain \0 at the end
+                 * end of entry name, so we copy it to new buffer
+                 * and add the \0 at the end
+                 */
+                buf = malloc(name_size+1);
+                if (buf == NULL) {
+                        ext4_directory_iterator_fini(&it);
+                        async_answer_0(callid, ENOMEM);
+                        return ENOMEM;
+                }
+                memcpy(buf, &it.current->name, name_size);
+                *(buf + name_size) = 0;
+                found = true;
+                (void) async_data_read_finalize(callid, buf, name_size + 1);
+                free(buf);
+                break;
+
+skip:
+                rc = ext4_directory_iterator_next(&it);
+                if (rc != EOK) {
+                        ext4_directory_iterator_fini(&it);
+                        async_answer_0(callid, rc);
+                        return rc;
+                }
+        }
+
+        if (found) {
+                rc = ext4_directory_iterator_next(&it);
+                if (rc != EOK)
+                        return rc;
+                next = it.current_offset;
+        }
+
+        rc = ext4_directory_iterator_fini(&it);
+        if (rc != EOK)
+                return rc;
+
+        if (found) {
+                *rbytes = next - pos;
+                return EOK;
+        } else {
+                async_answer_0(callid, ENOENT);
+                return ENOENT;
+        }
+}
+
+int ext4fs_read_file(ipc_callid_t callid, aoff64_t pos, size_t size,
+    ext4fs_instance_t *inst, ext4_inode_ref_t *inode_ref, size_t *rbytes)
+{
+        EXT4FS_DBG("");
+
+        int rc;
+        uint32_t block_size;
+        aoff64_t file_block;
+        uint64_t file_size;
+        uint32_t fs_block;
+        size_t offset_in_block;
+        size_t bytes;
+        block_t *block;
+        uint8_t *buffer;
+
+        file_size = ext4_inode_get_size(inst->filesystem->superblock,
+                inode_ref->inode);
+
+        if (pos >= file_size) {
+                /* Read 0 bytes successfully */
+                async_data_read_finalize(callid, NULL, 0);
+                *rbytes = 0;
+                return EOK;
+        }
+
+        /* For now, we only read data from one block at a time */
+        block_size = ext4_superblock_get_block_size(inst->filesystem->superblock);
+        file_block = pos / block_size;
+        offset_in_block = pos % block_size;
+        bytes = min(block_size - offset_in_block, size);
+
+        /* Handle end of file */
+        if (pos + bytes > file_size) {
+                bytes = file_size - pos;
+        }
+
+        /* Get the real block number */
+        rc = ext4_filesystem_get_inode_data_block_index(inst->filesystem,
+                inode_ref->inode, file_block, &fs_block);
+        if (rc != EOK) {
+                async_answer_0(callid, rc);
+                return rc;
+        }
+
+        /* Check for sparse file
+         * If ext2_filesystem_get_inode_data_block_index returned
+         * fs_block == 0, it means that the given block is not allocated for the
+         * file and we need to return a buffer of zeros
+         */
+        if (fs_block == 0) {
+                buffer = malloc(bytes);
+                if (buffer == NULL) {
+                        async_answer_0(callid, ENOMEM);
+                        return ENOMEM;
+                }
+
+                memset(buffer, 0, bytes);
+
+                async_data_read_finalize(callid, buffer, bytes);
+                *rbytes = bytes;
+
+                free(buffer);
+
+                return EOK;
+        }
+
+        /* Usual case - we need to read a block from device */
+        rc = block_get(&block, inst->service_id, fs_block, BLOCK_FLAGS_NONE);
+        if (rc != EOK) {
+                async_answer_0(callid, rc);
+                return rc;
+        }
+
+        assert(offset_in_block + bytes <= block_size);
+        async_data_read_finalize(callid, block->data + offset_in_block, bytes);
+
+        rc = block_put(block);
+        if (rc != EOK)
+                return rc;
+
+        *rbytes = bytes;
+        return EOK;
+}
 
 static int