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reorganized filesystem abstraction: files and directories are almost everywhere handled the same way, so there is no need for separate structs

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This commit is contained in:
Falk Werner 2019-03-03 15:29:39 +01:00
parent 58e65c4a31
commit 119d08c42e
1 changed files with 57 additions and 63 deletions
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120
example/provider/main.c
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@ -6,6 +6,22 @@
#include "wsfs_provider.h"
enum fs_entry_type
{
FS_FILE,
FS_DIR
};
struct fs_entry
{
ino_t parent;
ino_t inode;
char const * name;
int mode;
enum fs_entry_type type;
size_t content_length;
char const * content;
};
struct fs_dir
{
@ -26,41 +42,25 @@ struct fs_file
struct fs
{
struct fs_dir const * directories;
struct fs_file const * files;
struct fs_entry const * entries;
};
static struct fs_dir const * fs_getdir(
static struct fs_entry const * fs_getentry(
struct fs * fs,
ino_t inode)
{
for (size_t i = 0; 0 != fs->directories[i].inode; i++)
for (size_t i = 0; 0 != fs->entries[i].inode; i++)
{
struct fs_dir const * dir = &fs->directories[i];
if (inode == dir->inode)
struct fs_entry const * entry = &fs->entries[i];
if (inode == entry->inode)
{
return dir;
return entry;
}
}
return NULL;
}
static struct fs_file const * fs_getfile(
struct fs * fs,
ino_t inode)
{
for (size_t i = 0; 0 != fs->files[i].inode; i++)
{
struct fs_file const * f = &fs->files[i];
if (inode == f->inode)
{
return f;
}
}
return NULL;
}
static void fs_lookup(
struct wsfsp_request * request,
@ -68,7 +68,14 @@ static void fs_lookup(
char const * name,
void * user_data)
{
(void) parent;
struct fs * fs = (struct fs*) user_data;
struct fs_entry const * dir = fs_getentry(fs, parent);
if ((NULL != dir) && (FS_DIR == dir->type))
{
}
(void) name;
(void) user_data;
@ -83,26 +90,27 @@ static void fs_getattr(
void * user_data)
{
struct fs * fs = (struct fs*) user_data;
struct fs_dir const * dir = fs_getdir(fs, inode);
struct fs_file const * f = fs_getfile(fs, inode);
struct fs_entry const * entry = fs_getentry(fs, inode);
if (NULL != dir)
if (NULL != entry)
{
struct stat stat;
memset(&stat, 0, sizeof(stat));
stat.st_ino = inode;
stat.st_mode = S_IFDIR | 0555;
wsfsp_respond_getattr(request, &stat);
}
else if (NULL != f)
{
struct stat stat;
memset(&stat, 0, sizeof(stat));
stat.st_ino = entry->inode;
stat.st_mode = entry->mode;
if (FS_DIR == entry->type)
{
stat.st_mode |= S_IFDIR;
}
if (FS_FILE == entry->type)
{
stat.st_mode |= S_IFREG;
stat.st_size = entry->content_length;
}
stat.st_ino = inode;
stat.st_mode = S_IFREG | 0555;
stat.st_size = f->content_length;
wsfsp_respond_getattr(request, &stat);
}
else
@ -118,28 +126,19 @@ static void fs_readdir(
{
struct fs * fs = (struct fs*) user_data;
struct fs_dir const * dir = fs_getdir(fs, directory);
if (NULL != dir)
struct fs_entry const * dir = fs_getentry(fs, directory);
if ((NULL != dir) && (FS_DIR == dir->type))
{
struct wsfsp_dirbuffer * buffer = wsfsp_dirbuffer_create();
wsfsp_dirbuffer_add(buffer, ".", dir->inode);
wsfsp_dirbuffer_add(buffer, "..", dir->parent);
for(size_t i = 0; 0 != fs->directories[i].inode; i++)
for(size_t i = 0; 0 != fs->entries[i].inode; i++)
{
struct fs_dir const * subdir = &fs->directories[i];
if (directory == subdir->parent)
struct fs_entry const * entry = &fs->entries[i];
if (directory == entry->parent)
{
wsfsp_dirbuffer_add(buffer, subdir->name, subdir->inode);
}
}
for(size_t i = 0; 0 != fs->files[i].inode; i++)
{
struct fs_file const * f = &fs->files[i];
if (directory == f->parent)
{
wsfsp_dirbuffer_add(buffer, f->name, f->inode);
wsfsp_dirbuffer_add(buffer, entry->name, entry->inode);
}
}
@ -206,29 +205,24 @@ int main(int argc, char* argv[])
(void) argc;
(void) argv;
static struct fs_dir const directories[]=
{
{.parent = 0, .inode = 1, .name = "<root>"},
{.parent = 0, .inode = 0, .name = NULL}
};
static struct fs_file const files[] =
static struct fs_entry const entries[]=
{
{.parent = 0, .inode = 1, .name = "<root>", .mode = 0555, .type = FS_DIR},
{
.parent = 1,
.inode = 2,
.name = "hello.txt",
.mode = 0555,
.type = FS_FILE,
.content="hello, world!",
.content_length = 13,
.is_executable = false
},
{.parent = 0, .inode = 0}
{.parent = 0, .inode = 0, .name = NULL}
};
struct fs fs =
{
.directories = directories,
.files = files
.entries = entries
};
signal(SIGINT, &on_interrupt);