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Add link support in tmpfs

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This commit is contained in:
Kevin Lange 2016-12-19 23:28:03 +09:00
parent 58f1ad6bc5
commit 8ef8dec183
2 changed files with 67 additions and 0 deletions
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1
kernel/include/mod/tmpfs.h
View File

@ -17,6 +17,7 @@ struct tmpfs_file {
size_t block_count;
size_t pointers;
char ** blocks;
char * target;
};
struct tmpfs_dir;

66
modules/tmpfs.c
View File

@ -17,6 +17,7 @@
#define TMPFS_TYPE_FILE 1
#define TMPFS_TYPE_DIR 2
#define TMPFS_TYPE_LINK 3
static spin_lock_t tmpfs_lock = { 0 };
@ -49,6 +50,51 @@ static struct tmpfs_file * tmpfs_file_new(char * name) {
return t;
}
static void symlink_tmpfs(fs_node_t * parent, char * target, char * name) {
struct tmpfs_dir * d = (struct tmpfs_dir *)parent->device;
debug_print(CRITICAL, "Creating TMPFS file %s in %s", name, d->name);
spin_lock(tmpfs_lock);
foreach(f, d->files) {
struct tmpfs_file * t = (struct tmpfs_file *)f->value;
if (!strcmp(name, t->name)) {
spin_unlock(tmpfs_lock);
debug_print(WARNING, "... already exists.");
return; /* Already exists */
}
}
spin_unlock(tmpfs_lock);
debug_print(NOTICE, "... creating a new file (symlink).");
struct tmpfs_file * t = tmpfs_file_new(name);
t->type = TMPFS_TYPE_LINK;
debug_print(NOTICE, "symlink target is [%s]", target);
t->target = strdup(target);
spin_lock(tmpfs_lock);
list_insert(d->files, t);
spin_unlock(tmpfs_lock);
}
static int readlink_tmpfs(fs_node_t * node, char * buf, size_t size) {
struct tmpfs_file * t = (struct tmpfs_file *)(node->device);
if (t->type != TMPFS_TYPE_LINK) {
debug_print(WARNING, "Not a symlink? Very confused!");
return -1;
}
if (size < strlen(t->target) + 1) {
debug_print(WARNING, "Requested read size was only %d, need %d.", size, strlen(t->target)+1);
memcpy(buf, t->target, size);
buf[size] = '\0';
return size-1;
} else {
debug_print(WARNING, "Reading link target is [%s]", t->target);
memcpy(buf, t->target, strlen(t->target) + 1);
return strlen(t->target);
}
}
static struct tmpfs_dir * tmpfs_dir_new(char * name, struct tmpfs_dir * parent) {
spin_lock(tmpfs_lock);
@ -68,6 +114,10 @@ static struct tmpfs_dir * tmpfs_dir_new(char * name, struct tmpfs_dir * parent)
}
static void tmpfs_file_free(struct tmpfs_file * t) {
if (t->type == TMPFS_TYPE_LINK) {
debug_print(ERROR, "uh, what");
free(t->target);
}
for (size_t i = 0; i < t->block_count; ++i) {
free(t->blocks[i]);
}
@ -235,6 +285,19 @@ static fs_node_t * tmpfs_from_file(struct tmpfs_file * t) {
return fnode;
}
static fs_node_t * tmpfs_from_link(struct tmpfs_file * t) {
fs_node_t * fnode = tmpfs_from_file(t);
fnode->flags |= FS_SYMLINK;
fnode->readlink = readlink_tmpfs;
fnode->read = NULL;
fnode->write = NULL;
fnode->create = NULL;
fnode->mkdir = NULL;
fnode->readdir = NULL;
fnode->finddir = NULL;
return fnode;
}
static struct dirent * readdir_tmpfs(fs_node_t *node, uint32_t index) {
struct tmpfs_dir * d = (struct tmpfs_dir *)node->device;
uint32_t i = 0;
@ -290,6 +353,8 @@ static fs_node_t * finddir_tmpfs(fs_node_t * node, char * name) {
switch (t->type) {
case TMPFS_TYPE_FILE:
return tmpfs_from_file(t);
case TMPFS_TYPE_LINK:
return tmpfs_from_link(t);
case TMPFS_TYPE_DIR:
return tmpfs_from_dir((struct tmpfs_dir *)t);
}
@ -405,6 +470,7 @@ static fs_node_t * tmpfs_from_dir(struct tmpfs_dir * d) {
fnode->unlink = unlink_tmpfs;
fnode->mkdir = mkdir_tmpfs;
fnode->nlink = 1; /* should be "number of children that are directories + 1" */
fnode->symlink = symlink_tmpfs;
return fnode;
}