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kavcachefs.c
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/*
// kavcachefs: Remote file system read-only cache on local file system via FUSE
// Author: Kuzin Andrey <kuzinandrey@yandex.ru>
*/
#define FUSE_USE_VERSION 31
#include <fuse3/fuse.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <stddef.h>
#include <assert.h>
#include <limits.h> // PATH_MAX
#include <signal.h>
#include <libgen.h> // basename()
#include <dirent.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/vfs.h>
#include <sys/sendfile.h>
#include <pthread.h>
#ifndef PRODUCTION
#define TRACE fprintf(stderr,"TRACE %s:%d - %s()\n", __FILE__, __LINE__, __func__);
#define DEBUG(...) fprintf(stderr, __VA_ARGS__);
#else
#define TRACE
#define DEBUG(...)
#endif
enum eviction_enum {
EVICTION_UNKNOWN = 0,
EVICTION_NO,
EVICTION_RANDOM,
EVICTION_ATIME,
};
// Main program options
static struct options {
char *remote;
char *local;
char *eviction_cli;
enum eviction_enum eviction;
int eviction_try;
int show_help;
} options = {
.remote = NULL,
.local = NULL,
.eviction_cli = NULL,
.eviction = EVICTION_UNKNOWN,
.eviction_try = 5,
};
const char *eviction_enum_string(enum eviction_enum v) {
switch (v) {
case EVICTION_UNKNOWN: return "UNKNOWN";
case EVICTION_NO: return "NO";
case EVICTION_RANDOM: return "RANDOM";
case EVICTION_ATIME: return "ATIME";
}
return "unreachable place";
} // eviction_enum_string()
#define OPTION(t, p) { t, offsetof(struct options, p), 1 }
static const struct fuse_opt option_spec[] = {
OPTION("--remote=%s", remote),
OPTION("--local=%s", local),
OPTION("--eviction=%s", eviction_cli),
OPTION("--eviction_try=%d", eviction_try),
OPTION("-h", show_help),
OPTION("--help", show_help),
FUSE_OPT_END
};
// File record for store remote directory structure as tree in memory
struct file_record_st {
union {
char *dir;
char *name;
char *symlink;
struct file_record_st *subdir;
} val;
ino_t ino;
off_t size;
mode_t mode;
time_t atime;
time_t mtime;
struct file_record_st *next;
struct file_record_st *prev_cached; // list of cached files used for eviction
struct file_record_st *next_cached;
enum {
FILE_REC_UNKNOWN = 0,
FILE_REC_FILE,
FILE_REC_SYMLINK,
FILE_REC_PARENTDIR,
FILE_REC_SUBDIR,
} type;
enum {
FILE_NOT_IN_CACHE = 0,
FILE_IN_DOWNLOADING,
FILE_IN_CACHE,
} cache;
};
struct remote_filesystem_st;
// Download from remote dir queue
struct file_download_st {
char *name;
struct remote_filesystem_st *filesystem;
struct file_record_st *rec;
struct file_download_st *prev;
struct file_download_st *next;
};
// State of remote file system
struct remote_filesystem_st {
struct file_record_st *root;
ino_t next_inode; // inode counter
size_t total_size;
size_t total_dirs;
size_t total_files;
size_t total_symlinks;
size_t downloaded_files;
size_t downloaded_size;
size_t cached_files;
size_t cached_size;
size_t evicted_files;
size_t evicted_size;
size_t block_size;
pthread_rwlock_t rwlock;
size_t download_need_space;
struct file_record_st *cached_list;
struct file_download_st *download_list;
pthread_mutex_t download_mutex;
} *global_tree = NULL;
pthread_mutex_t global_tree_mutex = PTHREAD_MUTEX_INITIALIZER;
static size_t global_tree_block_size = 512; // unknown (set from remote fs - usual 4096)
static size_t global_localfs_size = 0;
static time_t global_start_time = 0;
// FUSE operation: init
static void *kavcachefs_init(struct fuse_conn_info *conn,
struct fuse_config *cfg)
{
(void) conn;
// cfg->kernel_cache = 1; // enable kernel cache
cfg->kernel_cache = 0; // disable kernel cache
// cfg->use_ino = 1;
// cfg->nullpath_ok = 1;
// cfg->entry_timeout = 0;
// cfg->attr_timeout = 0;
// cfg->negative_timeout = 0;
return NULL;
} // kavcachefs_init()
// Scan file tree for path
struct file_record_st *find_file_record_for_path(struct file_record_st *root, const char *path) {
const char *p = path;
size_t len = 0;
struct file_record_st *d = root;
if (strcmp(path, "/") == 0) return d;
while (1) {
if (*p == '/') p++;
if (d->type != FILE_REC_PARENTDIR) return NULL;
struct file_record_st *n = d->next;
d = NULL;
while (n) {
if (n->type == FILE_REC_FILE) {
// DEBUG("f %s %s\n",n->val.name, p);
len = strlen(n->val.name);
if (strncmp(n->val.name, p, len) == 0) {
if (*(p + len) == '\0') {
// DEBUG("found file %s = %ld\n", n->val.name, n->size);
return n;
}
}
} else if (n->type == FILE_REC_SYMLINK) {
// DEBUG("f %s %s\n",n->val.name, p);
len = strlen(n->val.symlink);
if (strncmp(n->val.symlink, p, len) == 0) {
if (*(p + len) == '\0') {
// DEBUG("found symlink %s = %ld\n", n->val.name, n->size);
return n;
}
}
} else if (n->type == FILE_REC_SUBDIR) {
// DEBUG("d %s %s\n",n->val.subdir->val.dir, p);
len = strlen(n->val.subdir->val.dir);
if (strncmp(n->val.subdir->val.dir, p, len) == 0) {
if (*(p + len)=='/') {
d = n->val.subdir;
p += len + 1;
break;
} else if (*(p + len) == '\0') {
// DEBUG("found dir %s\n", n->val.subdir->val.dir);
return n->val.subdir;
}
}
} else assert(0 && "unreachable place");
n = n->next;
} // while n
if (!d) break;
} // while
// DEBUG("not found %s\n", path);
return NULL;
} // find_file_record_for_path()
// FUSE operation: getattr
static int kavcachefs_getattr(const char *path, struct stat *stbuf,
struct fuse_file_info *fi)
{
(void) fi;
int ret = -ENOENT; // default error
// DEBUG("getattr: %s\n", path);
struct remote_filesystem_st *fs = NULL;
pthread_mutex_lock(&global_tree_mutex);
fs = global_tree;
pthread_mutex_unlock(&global_tree_mutex);
if (!fs) return ret;
memset(stbuf, 0, sizeof(struct stat));
pthread_rwlock_rdlock(&fs->rwlock);
if (!fs->root) goto exit;
struct file_record_st *d = NULL;
if (strcmp(path, "/") == 0) {
stbuf->st_mode = S_IFDIR | 0755;
stbuf->st_nlink = 2;
stbuf->st_size = fs->root->size;
stbuf->st_atime = fs->root->mtime;
stbuf->st_mtime = fs->root->mtime;
stbuf->st_ctime = fs->root->mtime;
ret = 0;
goto exit;
} else {
d = find_file_record_for_path(fs->root, path);
if (!d) goto exit;
};
if (d->type == FILE_REC_FILE) {
stbuf->st_mode = d->mode; // S_IFREG | 0444;
stbuf->st_nlink = 1;
stbuf->st_size = d->size;
if (d->cache == FILE_IN_CACHE) {
stbuf->st_blocks = (d->size / global_tree_block_size) * (global_tree_block_size / 512);
if ((d->size % global_tree_block_size) > 0) stbuf->st_blocks += (global_tree_block_size / 512);
} else stbuf->st_blocks = 0;
} else if (d->type == FILE_REC_PARENTDIR) {
stbuf->st_mode = S_IFDIR | 0755;
stbuf->st_nlink = 2;
stbuf->st_size = d->size;
// if (d->cache == FILE_IN_CACHE) {
// stbuf->st_blocks = d->size / global_tree_block_size;
// if ((d->size % global_tree_block_size) > 0) stbuf->st_blocks += 1;
// }
} else if (d->type == FILE_REC_SYMLINK) {
stbuf->st_mode = d->mode; // S_IFLNK | 0444;
stbuf->st_nlink = 1;
stbuf->st_size = strlen(d->val.symlink);
} else goto exit;
stbuf->st_blksize = 512;
stbuf->st_ino = d->ino;
stbuf->st_atime = d->atime;
stbuf->st_mtime = d->mtime;
stbuf->st_ctime = d->mtime;
ret = 0;
exit:
pthread_rwlock_unlock(&fs->rwlock);
return ret;
} // kavcachefs_getattr()
#ifndef FUSE_FILL_DIR_DEFAULTS
#define FUSE_FILL_DIR_DEFAULTS 0
#endif
// FUSE operation: readdir
static int kavcachefs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi,
enum fuse_readdir_flags flags)
{
// DEBUG("readdir: %s\n", path);
int ret = -ENOENT; // default error
(void) offset;
(void) fi;
(void) flags;
struct remote_filesystem_st *fs = NULL;
pthread_mutex_lock(&global_tree_mutex);
fs = global_tree;
pthread_mutex_unlock(&global_tree_mutex);
if (!fs) return ret;
pthread_rwlock_rdlock(&fs->rwlock);
if (!fs->root) goto exit;
struct file_record_st *n = find_file_record_for_path(fs->root, path);
if (!n) goto exit;
if (n->type != FILE_REC_PARENTDIR) goto exit;
struct file_record_st *find = n->next;
filler(buf, ".", NULL, 0, FUSE_FILL_DIR_DEFAULTS);
filler(buf, "..", NULL, 0, FUSE_FILL_DIR_DEFAULTS);
while (find) {
if (find->type == FILE_REC_FILE) {
filler(buf, find->val.name, NULL, 0, FUSE_FILL_DIR_DEFAULTS);
} else if (find->type == FILE_REC_SYMLINK) {
filler(buf, find->val.symlink, NULL, 0, FUSE_FILL_DIR_DEFAULTS);
} else if (find->type == FILE_REC_SUBDIR && find->val.subdir) {
filler(buf, find->val.subdir->val.dir, NULL, 0, FUSE_FILL_DIR_DEFAULTS);
}
find = find->next;
}
ret = 0;
exit:
pthread_rwlock_unlock(&fs->rwlock);
return ret;
} // kavcachefs_readdir()
// FUSE operation: open
static int kavcachefs_open(const char *path, struct fuse_file_info *fi)
{
// DEBUG("open: %s\n", path);
int ret = -ENOENT; // default error
struct remote_filesystem_st *fs = NULL;
pthread_mutex_lock(&global_tree_mutex);
fs = global_tree;
pthread_mutex_unlock(&global_tree_mutex);
if (!fs) return ret;
pthread_rwlock_rdlock(&fs->rwlock);
if (!fs->root) goto exit;
struct file_record_st *n = find_file_record_for_path(fs->root, path);
if (!n) goto exit;
if ((fi->flags & O_ACCMODE) != O_RDONLY) ret = -EACCES;
exit:
pthread_rwlock_unlock(&fs->rwlock);
return 0;
} // kavcachefs_open()
// Try to find cached file by eviction rule for delete
struct file_record_st *find_evicted_file(struct remote_filesystem_st *fs) {
struct file_record_st *ret = NULL;
pthread_rwlock_rdlock(&fs->rwlock);
if (options.eviction == EVICTION_RANDOM) {
int rnd_file = 0;
if (fs->cached_files > 0) {
rnd_file = rand() % fs->cached_files;
ret = fs->cached_list;
while (ret && rnd_file > 0) {
ret = ret->next_cached;
rnd_file--;
}
}
} else if (options.eviction == EVICTION_ATIME) {
time_t min_atime = time(NULL);
struct file_record_st *it = fs->cached_list;
while (it) {
if (it->atime < min_atime) {
ret = it;
min_atime = it->atime;
}
it = it->next_cached;
}
}
pthread_rwlock_unlock(&fs->rwlock);
return ret;
} // find_evicted_file()
// Build path to cached file in buffer
char *build_file_path(char *path, size_t path_size, size_t pos,
struct file_record_st *dir, struct file_record_st *file
) {
if (dir->type != FILE_REC_PARENTDIR) return NULL;
struct file_record_st *it = dir->next;
while (it) {
if (it == file && it->type == FILE_REC_FILE) {
snprintf(path + pos, path_size - pos, "/%s", it->val.name);
return path;
} else if (it->type == FILE_REC_SUBDIR) {
size_t rpos = pos + snprintf(path + pos, path_size - pos, "/%s", it->val.subdir->val.dir);
char *recurse = build_file_path(path, path_size, rpos, it->val.subdir, file);
if (recurse) return recurse;
}
it = it->next;
}
*(path + pos) = '\0';
return NULL;
} // build_file_path()
// Thread function for downloading file from remote dir to local
void *download_remote_file(void *data) {
struct file_download_st *job = data;
FILE *in = NULL;
FILE *out = NULL;
size_t download_size = 0;
char read_path[PATH_MAX];
char write_path[PATH_MAX];
int eviction_count = 0;
int can_download = 0;
int file_too_big = 0;
// check download list for this file (if already in queue)
pthread_mutex_lock(&job->filesystem->download_mutex);
struct file_download_st *already_go = job->filesystem->download_list;
while (already_go) {
if (strcmp(already_go->name, job->name) == 0) break;
already_go = already_go->next;
}
if (already_go) {
DEBUG("job %s already in list\n", job->name);
pthread_mutex_unlock(&job->filesystem->download_mutex);
goto exit;
} else {
job->prev = NULL;
job->next = job->filesystem->download_list;
if (job->filesystem->download_list)
job->filesystem->download_list->prev = job;
job->filesystem->download_list = job;
job->filesystem->download_need_space += job->rec->size;
}
pthread_mutex_unlock(&job->filesystem->download_mutex);
// check free space on local dir fs
struct statfs lfs;
snprintf(write_path, sizeof(write_path), "%s", options.local);
eviction_repeat:
can_download = 0;
if (statfs(write_path, &lfs) != 0) {
DEBUG("cant statfs on %s\n", write_path);
goto remove_from_list;
}
pthread_mutex_lock(&job->filesystem->download_mutex);
if (job->filesystem->download_need_space < lfs.f_bsize * lfs.f_bavail) {
can_download = 1;
} else if (job->rec->size > lfs.f_bsize * lfs.f_blocks) {
file_too_big = 1;
}
pthread_mutex_unlock(&job->filesystem->download_mutex);
if (file_too_big) {
DEBUG("file too big for download in local filesystem (need=%ld, bsize=%ld blocks=%ld)\n",
job->rec->size, lfs.f_bsize, lfs.f_blocks);
goto remove_from_list;
}
if (can_download == 0) {
// evict cached file for clean space
if (
options.eviction == EVICTION_ATIME
|| options.eviction == EVICTION_RANDOM
) {
struct file_record_st *evicted_file = find_evicted_file(job->filesystem);
if (evicted_file) {
// DEBUG("found evicted file %s\n", evicted_file->val.name);
size_t len = snprintf(read_path, sizeof(read_path), "%s", options.local);
char *del = build_file_path(read_path, sizeof(read_path), len, job->filesystem->root, evicted_file);
// if (del) DEBUG("EVICTION file %s\n", del);
if (del && unlink(del) == 0) {
DEBUG("DELETE #%d evicted file %s = %ld\n", eviction_count, del, evicted_file->size);
pthread_rwlock_wrlock(&job->filesystem->rwlock);
evicted_file->cache = FILE_NOT_IN_CACHE;
job->filesystem->cached_files--;
job->filesystem->cached_size -= evicted_file->size;
job->filesystem->evicted_files++;
job->filesystem->evicted_size += evicted_file->size;
// remove evicted file from cached list
if (!evicted_file->prev_cached)
job->filesystem->cached_list = evicted_file->next_cached;
else
evicted_file->prev_cached->next_cached = evicted_file->next_cached;
if (evicted_file->next_cached)
evicted_file->next_cached->prev_cached = evicted_file->prev_cached;
evicted_file->prev_cached = NULL;
evicted_file->next_cached = NULL;
pthread_rwlock_unlock(&job->filesystem->rwlock);
eviction_count++;
if (eviction_count < options.eviction_try) goto eviction_repeat;
}
}
}
DEBUG("no more space in local filesystem (need=%ld, bsize=%ld bfree=%ld bavail=%ld)\n",
job->rec->size, lfs.f_bsize, lfs.f_bfree, lfs.f_bavail);
goto remove_from_list;
}
snprintf(read_path, sizeof(read_path), "%s%s", options.remote, job->name);
snprintf(write_path, sizeof(write_path), "%s%s", options.local, job->name);
DEBUG("download:\n\tfrom: %s\n\tto: %s\n", read_path, write_path);
// create destination path as "mkdir -p"
char *slash = strchr(write_path,'/');
while (slash) {
*slash = '\0';
if (access(write_path, R_OK | W_OK | X_OK) != 0) {
mkdir(write_path, S_IRWXU);
}
*slash = '/';
slash = strchr(slash + 1, '/');
};
// open remote file
in = fopen(read_path, "rb");
if (!in) {
DEBUG("cant open file %s\n", read_path);
//TODO remove job->rec from cache file tree
goto remove_from_list;
}
// open local file
out = fopen(write_path, "wb");
if (!out) {
DEBUG("cant create file %s\n", write_path);
goto remove_from_list;
}
// save file remote file modif time
struct stat fst;
int stat_ok = 0;
if (stat(read_path, &fst) == 0) stat_ok = 1;
pthread_rwlock_wrlock(&job->filesystem->rwlock);
job->rec->cache = FILE_IN_DOWNLOADING;
pthread_rwlock_unlock(&job->filesystem->rwlock);
#ifndef _SYS_SENDFILE_H
do {
// use read_path as copy buffer
size_t r = fread(read_path, 1, sizeof(read_path), in);
size_t w = fwrite(read_path, 1, r, out);
DEBUG("copy %s = %ld buffer\n", job->name, w);
if (w != r) goto remove_fail;
download_size += w;
} while (!feof(in));
#else
off_t offs = 0;
ssize_t sended = 0;
do {
sended = sendfile(fileno(out), fileno(in), &offs, job->rec->size - offs);
DEBUG("sendfile %s = %ld\n", job->name, sended);
if (sended == -1) break;
download_size += sended;
} while (download_size != job->rec->size);
if (sended == -1) {
DEBUG("sendfile failure, error = %d\n", errno);
goto remove_fail;
}
#endif
if (in) { fclose(in); in = NULL; }
if (out) { fclose(out); out = NULL; }
// restore times on local file
if (stat_ok) {
struct timeval tim[2] = {0};
tim[0].tv_sec = fst.st_atime;
tim[1].tv_sec = fst.st_mtime;
if (utimes(write_path, tim) == 0) {
DEBUG("modify time %s\n", write_path);
};
}
// add file in cached list
pthread_rwlock_wrlock(&job->filesystem->rwlock);
job->rec->cache = FILE_IN_CACHE;
job->filesystem->downloaded_files++;
job->filesystem->downloaded_size += fst.st_size;
job->filesystem->cached_files++;
job->filesystem->cached_size += fst.st_size;
job->rec->prev_cached = NULL;
job->rec->next_cached = job->filesystem->cached_list;
if (job->filesystem->cached_list)
job->filesystem->cached_list->prev_cached = job->rec;
job->filesystem->cached_list = job->rec;
if (stat_ok) {
job->rec->atime = fst.st_atime;
job->rec->mtime = fst.st_mtime;
}
pthread_rwlock_unlock(&job->filesystem->rwlock);
DEBUG("download file %s = %ld OK\n", job->name, download_size);
goto remove_from_list;
remove_fail:
if (in) { fclose(in); in = NULL; }
if (out) { fclose(out); out = NULL; }
pthread_rwlock_wrlock(&job->filesystem->rwlock);
job->rec->cache = FILE_NOT_IN_CACHE;
pthread_rwlock_unlock(&job->filesystem->rwlock);
unlink(write_path);
remove_from_list:
pthread_mutex_lock(&job->filesystem->download_mutex);
job->filesystem->download_need_space -= job->rec->size;
DEBUG("remove job from list %s (need space=%ld)\n",
job->name, job->filesystem->download_need_space);
if (!job->prev)
job->filesystem->download_list = job->next;
else
job->prev->next = job->next;
if (job->next) job->next->prev = job->prev;
job->next = NULL;
job->prev = NULL;
pthread_mutex_unlock(&job->filesystem->download_mutex);
goto exit;
exit:
if (in) fclose(in);
if (out) fclose(out);
free(job->name);
free(job);
pthread_exit(NULL);
} // download_remote_file()
// FUSE operation: read
static int kavcachefs_read(const char *path, char *buf, size_t size,
off_t offset, struct fuse_file_info *fi)
{
// DEBUG("read: %s size=%ld offs=%ld\n", path, size, offset);
(void) fi;
char read_path[PATH_MAX];
struct remote_filesystem_st *fs = NULL;
pthread_mutex_lock(&global_tree_mutex);
fs = global_tree;
pthread_mutex_unlock(&global_tree_mutex);
if (!fs) return 0;
int ret = 0;
int cache_state = 0;
pthread_rwlock_rdlock(&fs->rwlock);
struct file_record_st *n = find_file_record_for_path(fs->root, path);
if (!n) ret = 1;
else {
cache_state = n->cache;
if (n->type != FILE_REC_FILE || offset > n->size) ret = 1;
}
pthread_rwlock_unlock(&fs->rwlock);
if (ret == 1) return 0;
// path start from '/' char
if (cache_state != FILE_IN_CACHE) {
snprintf(read_path, sizeof(read_path), "%s%s", options.remote, path);
} else {
snprintf(read_path, sizeof(read_path), "%s%s", options.local, path);
}
FILE *f = fopen(read_path,"rb");
if (f) {
if (
cache_state == FILE_NOT_IN_CACHE
&& global_localfs_size > n->size
) {
struct file_download_st *job = calloc(1, sizeof(struct file_download_st));
if (job) {
job->filesystem = fs;
job->rec = n;
job->name = strdup(path);
if (job->name) {
pthread_t th;
int r = pthread_create(&th, NULL, download_remote_file, (void *)job);
if (r == 0) {
// DEBUG("create download thread for %s\n", path);
r = pthread_detach(th);
} else {
free(job->name);
free(job);
}
} else {
free(job);
}
}
}
if (0 == fseek(f, offset, SEEK_SET)) {
size = fread(buf, 1, size, f);
} else size = 0;
fclose(f);
} else size = 0;
pthread_rwlock_wrlock(&fs->rwlock);
n->atime = time(NULL);
pthread_rwlock_unlock(&fs->rwlock);
DEBUG("read data from %s, offset=%ld size=%ld\n", read_path, offset, size);
return size;
} // kavcachefs_read()
static int kavcachefs_readlink(const char *path, char *buf, size_t size)
{
struct remote_filesystem_st *fs = NULL;
pthread_mutex_lock(&global_tree_mutex);
fs = global_tree;
pthread_mutex_unlock(&global_tree_mutex);
if (!fs) return -1;
pthread_rwlock_rdlock(&fs->rwlock);
struct file_record_st *n = find_file_record_for_path(fs->root, path);
pthread_rwlock_unlock(&fs->rwlock);
if (!n) return -1;
if (n->type != FILE_REC_SYMLINK) return -1;
memcpy(buf, &(*n->val.symlink) + strlen(n->val.symlink) + 1, n->size + 1);
return 0;
} // kavcachefs_readlink()
// recursively read directory
struct file_record_st *recurse_read_dir(char *path, size_t path_size,
size_t remotelen, struct remote_filesystem_st *fs)
{
char base_path[PATH_MAX];
char local_path[PATH_MAX];
struct stat fst;
size_t pos = strlen(path);
// DEBUG("scan directory %s\n", path);
size_t dir_size = 0;
DIR *dir = opendir(path);
struct dirent *entry;
if (!dir) {
DEBUG("can't open dir %s: %s", path, strerror(errno));
return NULL;
}
struct file_record_st *dirholder = calloc(1, sizeof(struct file_record_st));
if (!dirholder) goto exit;
strcpy(base_path, path);
dirholder->val.dir = strdup(basename(base_path));
if (!dirholder->val.dir) { free(dirholder); dirholder = NULL; goto exit; }
dirholder->type = FILE_REC_PARENTDIR;
while ((entry = readdir(dir)) != NULL) {
if (strcmp(entry->d_name,".") == 0 || strcmp(entry->d_name,"..") == 0) continue;
// DEBUG("name %s = type %d\n", entry->d_name, entry->d_type);
if (snprintf(path + pos, path_size - pos,
"/%s", entry->d_name) == strlen(entry->d_name) + 1)
{
if (entry->d_type == DT_LNK) {
if (lstat(path, &fst) != 0) continue;
} else {
if (stat(path, &fst) != 0) continue;
}
struct file_record_st *rec = calloc(1, sizeof(struct file_record_st));
if (!rec) continue;
if (S_ISREG(fst.st_mode) && !S_ISLNK(fst.st_mode)) {
rec->val.name = strdup(entry->d_name);
if (!rec->val.name) { free(rec); continue; }
dir_size += fst.st_size;
rec->size = fst.st_size;
rec->type = FILE_REC_FILE;
fs->total_files++;
// check already loaded
snprintf(local_path, sizeof(local_path), "%s%s", options.local, path + remotelen);
if (access(local_path, F_OK) == 0) {
DEBUG("check file %s", local_path);
struct stat fstloc;
if (stat(local_path, &fstloc) == 0) {
if (fstloc.st_size == fst.st_size && fstloc.st_mtime == fst.st_mtime) {
DEBUG(" = %ld OK\n", fstloc.st_size);
rec->cache = FILE_IN_CACHE;
fs->cached_files++;
fs->cached_size += fstloc.st_size;
rec->prev_cached = NULL;
rec->next_cached = fs->cached_list;
if (fs->cached_list) fs->cached_list->prev_cached = rec;
fs->cached_list = rec;
} else {
if (unlink(local_path) == 0) {
DEBUG(" = %ld DELETED\n", fstloc.st_size);
} else {
DEBUG(" = %ld FAILED\n", fstloc.st_size);
};
}
}
}
} else if (S_ISDIR(fst.st_mode) && !S_ISLNK(fst.st_mode)) {
rec->val.subdir = recurse_read_dir(path, path_size, remotelen, fs);
if (!rec->val.subdir) { free(rec); continue; }
rec->val.subdir->atime = fst.st_atime;
rec->val.subdir->mtime = fst.st_mtime;
dir_size += rec->val.subdir->size;
rec->type = FILE_REC_SUBDIR;
fs->total_dirs++;
} else if (S_ISLNK(fst.st_mode)) {
size_t l = strlen(entry->d_name);
rec->val.symlink = calloc(1, l + fst.st_size + 3);
if (!rec->val.symlink) { free(rec); continue; }
rec->size = fst.st_size;
strcpy(rec->val.symlink, entry->d_name);
if (readlink(path, rec->val.symlink + l + 1, fst.st_size + 1) == fst.st_size) {
*(rec->val.symlink + l + 1 + fst.st_size + 1) = '\0';
// DEBUG("add symlink %s, size=%ld, value=%s\n",rec->val.symlink, fst.st_size, &(*rec->val.symlink) + l + 1);
rec->type = FILE_REC_SYMLINK;
fs->total_symlinks++;
} else {
free(rec->val.symlink);
free(rec);
continue;
}
} else {
DEBUG("unknown %s, mode %d\n", path, fst.st_mode);
free(rec); continue;
}
rec->mode = fst.st_mode;
rec->atime = fst.st_atime;
rec->mtime = fst.st_mtime;
rec->ino = fs->next_inode++;
fs->total_size += fst.st_size;
rec->next = dirholder->next;
dirholder->next = rec;
}
}
exit:
closedir(dir);
if (dirholder) dirholder->size = dir_size;
// restore path after recursion
*(path + pos) = '\0';
return dirholder;
} // recurse_read_dir()
// Clean local dir from trash files
int clean_localdir_from_trash_files(char *path, size_t path_size, size_t remotelen, struct file_record_st *root) {
// DEBUG("clean %s\n", path);
DIR *dir;
struct dirent *entry;
size_t pos = strlen(path);
dir = opendir(path);
if (!dir) return 0;
size_t files_in_dir = 0;
size_t deleted = 0;
while ( (entry = readdir(dir)) != NULL) {
if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) continue;
files_in_dir++;
snprintf(path + pos, PATH_MAX - pos, "/%s", entry->d_name);
if (entry->d_type == DT_REG) {
struct file_record_st *n = find_file_record_for_path(root, path + remotelen);
if (!n) {
if (unlink(path) == 0) {
DEBUG("%s DELETED\n", path);
deleted++;
} else {
DEBUG("%s delete FAILED\n", path);
};
} else {
// DEBUG("check file %s\n", path + remotelen);
}
} else if (entry->d_type == DT_DIR) {
// DEBUG("recurse to dir %s\n", path);
deleted += clean_localdir_from_trash_files(path, PATH_MAX, remotelen, root);
};
};
closedir(dir);
*(path + pos) = '\0';
// delete empty directories
if (files_in_dir == deleted && strlen(path + remotelen) > 0) {
if (rmdir(path) == 0) {
// DEBUG("delete empty dir %s\n", path);
return 1;
};
}
return 0;
} // clean_localdir_from_trash_files()
// Clean memory from remote filesystem tree
int clean_memory_from_remotefs(struct file_record_st *fs) {
struct file_record_st *p = fs, *t;
while (p) {
switch (p->type) {
case FILE_REC_FILE: {
if (p->val.name) free(p->val.name);
} break;
case FILE_REC_SYMLINK: {
if (p->val.symlink) free(p->val.symlink);
} break;
case FILE_REC_PARENTDIR: {
if (p->val.dir) free(p->val.dir);
} break;
case FILE_REC_SUBDIR: {
if (p->val.subdir) clean_memory_from_remotefs(p->val.subdir);
} break;
default: break;
}
t = p;
p = p->next;
free(t);
};
return 0;
} // clean_memory_from_remotefs()
void *thread_garbage_fs_cleaner(void *data) {
char local_path[PATH_MAX];
DEBUG("thread_garbage_fs_cleaner start\n");
// Free memory
struct remote_filesystem_st *t = data;
sleep(1);
do {
int need_wait = 0;
pthread_mutex_lock(&t->download_mutex);
if (t->download_list) need_wait = 1;
pthread_mutex_unlock(&t->download_mutex);
if (need_wait) sleep(1); else break;
} while (1);
pthread_rwlock_wrlock(&t->rwlock);
if (t->root) {
clean_memory_from_remotefs(t->root);
}
pthread_rwlock_unlock(&t->rwlock);
free(t);
// Clean local filesystem from removed files on remote
struct file_record_st *tree = NULL;
pthread_mutex_lock(&global_tree_mutex);
if (global_tree) tree = global_tree->root;
pthread_mutex_unlock(&global_tree_mutex);
if (tree) {
snprintf(local_path, PATH_MAX, "%s", options.local);
clean_localdir_from_trash_files(local_path, PATH_MAX, strlen(options.local), tree);
}
pthread_exit(NULL);
} // clean_memory_from_remotefs()
// Read remote filesystem tree in memory
int update_cache_from_remote_dir() {
char work_path[PATH_MAX];
struct remote_filesystem_st *new_fs = calloc(1, sizeof(struct remote_filesystem_st));
if (!new_fs) return -1;
DEBUG("update cache from remote dir\n");
snprintf(work_path, sizeof(work_path), "%s", options.remote);
new_fs->root = NULL;
new_fs->next_inode = 1;
new_fs->total_size = 0;
new_fs->total_dirs = 0;
new_fs->total_files = 0;
new_fs->total_symlinks = 0;
new_fs->downloaded_files = 0;
new_fs->downloaded_size = 0;
new_fs->cached_files = 0;
new_fs->cached_size = 0;
new_fs->evicted_files = 0;
new_fs->evicted_size = 0;
new_fs->download_need_space = 0;