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-rw-r--r--sdcard/sdcard.c337
1 files changed, 287 insertions, 50 deletions
diff --git a/sdcard/sdcard.c b/sdcard/sdcard.c
index 82e6354..7112ebf 100644
--- a/sdcard/sdcard.c
+++ b/sdcard/sdcard.c
@@ -25,6 +25,7 @@
#include <sys/statfs.h>
#include <sys/uio.h>
#include <dirent.h>
+#include <ctype.h>
#include <private/android_filesystem_config.h>
@@ -55,10 +56,6 @@
* kernel, you must rollback the refcount to reflect the reference the
* kernel did not actually acquire
*
- *
- * Bugs:
- *
- * - need to move/rename node on RENAME
*/
#define FUSE_TRACE 0
@@ -89,15 +86,21 @@ struct node {
__u64 nid;
__u64 gen;
- struct node *next;
- struct node *child;
- struct node *all;
- struct node *parent;
+ struct node *next; /* per-dir sibling list */
+ struct node *child; /* first contained file by this dir */
+ struct node *all; /* global node list */
+ struct node *parent; /* containing directory */
__u32 refcount;
__u32 namelen;
- char name[1];
+ char *name;
+ /* If non-null, this is the real name of the file in the underlying storage.
+ * This may differ from the field "name" only by case.
+ * strlen(actual_name) will always equal strlen(name), so it is safe to use
+ * namelen for both fields.
+ */
+ char *actual_name;
};
struct fuse {
@@ -112,10 +115,24 @@ struct fuse {
char rootpath[1024];
};
+static unsigned uid = -1;
+static unsigned gid = -1;
+
#define PATH_BUFFER_SIZE 1024
-char *node_get_path(struct node *node, char *buf, const char *name)
+#define NO_CASE_SENSITIVE_MATCH 0
+#define CASE_SENSITIVE_MATCH 1
+
+/*
+ * Get the real-life absolute path to a node.
+ * node: start at this node
+ * buf: storage for returned string
+ * name: append this string to path if set
+ */
+char *do_node_get_path(struct node *node, char *buf, const char *name, int match_case_insensitive)
{
+ struct node *in_node = node;
+ const char *in_name = name;
char *out = buf + PATH_BUFFER_SIZE - 1;
int len;
out[0] = 0;
@@ -126,7 +143,7 @@ char *node_get_path(struct node *node, char *buf, const char *name)
}
while (node) {
- name = node->name;
+ name = (node->actual_name ? node->actual_name : node->name);
len = node->namelen;
node = node->parent;
start:
@@ -134,11 +151,45 @@ char *node_get_path(struct node *node, char *buf, const char *name)
return 0;
out -= len;
memcpy(out, name, len);
- out --;
- out[0] = '/';
+ /* avoid double slash at beginning of path */
+ if (out[0] != '/') {
+ out --;
+ out[0] = '/';
+ }
}
- return out;
+ /* If we are searching for a file within node (rather than computing node's path)
+ * and fail, then we need to look for a case insensitive match.
+ */
+ if (in_name && match_case_insensitive && access(out, F_OK) != 0) {
+ char *path, buffer[PATH_BUFFER_SIZE];
+ DIR* dir;
+ struct dirent* entry;
+ path = do_node_get_path(in_node, buffer, NULL, NO_CASE_SENSITIVE_MATCH);
+ dir = opendir(path);
+ if (!dir) {
+ ERROR("opendir %s failed: %s", path, strerror(errno));
+ return out;
+ }
+
+ while ((entry = readdir(dir))) {
+ if (!strcasecmp(entry->d_name, in_name)) {
+ /* we have a match - replace the name */
+ len = strlen(in_name);
+ memcpy(buf + PATH_BUFFER_SIZE - len - 1, entry->d_name, len);
+ break;
+ }
+ }
+ closedir(dir);
+ }
+
+ return out;
+}
+
+char *node_get_path(struct node *node, char *buf, const char *name)
+{
+ /* We look for case insensitive matches by default */
+ return do_node_get_path(node, buf, name, CASE_SENSITIVE_MATCH);
}
void attr_from_stat(struct fuse_attr *attr, struct stat *s)
@@ -189,28 +240,84 @@ int node_get_attr(struct node *node, struct fuse_attr *attr)
return 0;
}
+static void add_node_to_parent(struct node *node, struct node *parent) {
+ node->parent = parent;
+ node->next = parent->child;
+ parent->child = node;
+ parent->refcount++;
+}
+
+/* Check to see if our parent directory already has a file with a name
+ * that differs only by case. If we find one, store it in the actual_name
+ * field so node_get_path will map it to this file in the underlying storage.
+ */
+static void node_find_actual_name(struct node *node)
+{
+ char *path, buffer[PATH_BUFFER_SIZE];
+ const char *node_name = node->name;
+ DIR* dir;
+ struct dirent* entry;
+
+ if (!node->parent) return;
+
+ path = node_get_path(node->parent, buffer, 0);
+ dir = opendir(path);
+ if (!dir) {
+ ERROR("opendir %s failed: %s", path, strerror(errno));
+ return;
+ }
+
+ while ((entry = readdir(dir))) {
+ const char *test_name = entry->d_name;
+ if (strcmp(test_name, node_name) && !strcasecmp(test_name, node_name)) {
+ /* we have a match - differs but only by case */
+ node->actual_name = strdup(test_name);
+ if (!node->actual_name) {
+ ERROR("strdup failed - out of memory\n");
+ exit(1);
+ }
+ break;
+ }
+ }
+ closedir(dir);
+}
+
struct node *node_create(struct node *parent, const char *name, __u64 nid, __u64 gen)
{
struct node *node;
int namelen = strlen(name);
- node = calloc(1, sizeof(struct node) + namelen);
+ node = calloc(1, sizeof(struct node));
if (node == 0) {
return 0;
}
+ node->name = malloc(namelen + 1);
+ if (node->name == 0) {
+ free(node);
+ return 0;
+ }
node->nid = nid;
node->gen = gen;
- node->parent = parent;
- node->next = parent->child;
- parent->child = node;
+ add_node_to_parent(node, parent);
memcpy(node->name, name, namelen + 1);
node->namelen = namelen;
- parent->refcount++;
-
+ node_find_actual_name(node);
return node;
}
+static char *rename_node(struct node *node, const char *name)
+{
+ node->namelen = strlen(name);
+ char *newname = realloc(node->name, node->namelen + 1);
+ if (newname == 0)
+ return 0;
+ node->name = newname;
+ memcpy(node->name, name, node->namelen + 1);
+ node_find_actual_name(node);
+ return node->name;
+}
+
void fuse_init(struct fuse *fuse, int fd, const char *path)
{
fuse->fd = fd;
@@ -227,8 +334,8 @@ void fuse_init(struct fuse *fuse, int fd, const char *path)
fuse->root.all = 0;
fuse->root.refcount = 2;
- strcpy(fuse->root.name, path);
- fuse->root.namelen = strlen(fuse->root.name);
+ fuse->root.name = 0;
+ rename_node(&fuse->root, path);
}
static inline void *id_to_ptr(__u64 nid)
@@ -271,6 +378,37 @@ struct node *lookup_child_by_inode(struct node *node, __u64 nid)
return 0;
}
+static void dec_refcount(struct node *node) {
+ if (node->refcount > 0) {
+ node->refcount--;
+ TRACE("dec_refcount %p(%s) -> %d\n", node, node->name, node->refcount);
+ } else {
+ ERROR("Zero refcnt %p\n", node);
+ }
+ }
+
+static struct node *remove_child(struct node *parent, __u64 nid)
+{
+ struct node *prev = 0;
+ struct node *node;
+
+ for (node = parent->child; node; node = node->next) {
+ if (node->nid == nid) {
+ if (prev) {
+ prev->next = node->next;
+ } else {
+ parent->child = node->next;
+ }
+ node->next = 0;
+ node->parent = 0;
+ dec_refcount(parent);
+ return node;
+ }
+ prev = node;
+ }
+ return 0;
+}
+
struct node *node_lookup(struct fuse *fuse, struct node *parent, const char *name,
struct fuse_attr *attr)
{
@@ -305,7 +443,7 @@ struct node *node_lookup(struct fuse *fuse, struct node *parent, const char *nam
void node_release(struct node *node)
{
TRACE("RELEASE %p (%s) rc=%d\n", node, node->name, node->refcount);
- node->refcount--;
+ dec_refcount(node);
if (node->refcount == 0) {
if (node->parent->child == node) {
node->parent->child = node->parent->child->next;
@@ -326,8 +464,10 @@ void node_release(struct node *node)
node->next = 0;
/* TODO: remove debugging - poison memory */
- memset(node, 0xef, sizeof(*node) + strlen(node->name));
-
+ memset(node->name, 0xef, node->namelen);
+ free(node->name);
+ free(node->actual_name);
+ memset(node, 0xfc, sizeof(*node));
free(node);
}
}
@@ -427,7 +567,7 @@ void handle_fuse_request(struct fuse *fuse, struct fuse_in_header *hdr, void *da
struct fuse_getattr_in *req = data;
struct fuse_attr_out out;
- TRACE("GETATTR flags=%x fh=%llx\n",req->getattr_flags, req->fh);
+ TRACE("GETATTR flags=%x fh=%llx\n", req->getattr_flags, req->fh);
memset(&out, 0, sizeof(out));
node_get_attr(node, &out.attr);
@@ -439,15 +579,60 @@ void handle_fuse_request(struct fuse *fuse, struct fuse_in_header *hdr, void *da
case FUSE_SETATTR: { /* setattr_in -> attr_out */
struct fuse_setattr_in *req = data;
struct fuse_attr_out out;
+ char *path, buffer[PATH_BUFFER_SIZE];
+ int res = 0;
+ struct timespec times[2];
+
TRACE("SETATTR fh=%llx id=%llx valid=%x\n",
req->fh, hdr->nodeid, req->valid);
- /* XXX */
+ /* XXX: incomplete implementation on purpose. chmod/chown
+ * should NEVER be implemented.*/
+
+ path = node_get_path(node, buffer, 0);
+ if (req->valid & FATTR_SIZE)
+ res = truncate(path, req->size);
+ if (res)
+ goto getout;
+
+ /* Handle changing atime and mtime. If FATTR_ATIME_and FATTR_ATIME_NOW
+ * are both set, then set it to the current time. Else, set it to the
+ * time specified in the request. Same goes for mtime. Use utimensat(2)
+ * as it allows ATIME and MTIME to be changed independently, and has
+ * nanosecond resolution which fuse also has.
+ */
+ if (req->valid & (FATTR_ATIME | FATTR_MTIME)) {
+ times[0].tv_nsec = UTIME_OMIT;
+ times[1].tv_nsec = UTIME_OMIT;
+ if (req->valid & FATTR_ATIME) {
+ if (req->valid & FATTR_ATIME_NOW) {
+ times[0].tv_nsec = UTIME_NOW;
+ } else {
+ times[0].tv_sec = req->atime;
+ times[0].tv_nsec = req->atimensec;
+ }
+ }
+ if (req->valid & FATTR_MTIME) {
+ if (req->valid & FATTR_MTIME_NOW) {
+ times[1].tv_nsec = UTIME_NOW;
+ } else {
+ times[1].tv_sec = req->mtime;
+ times[1].tv_nsec = req->mtimensec;
+ }
+ }
+ TRACE("Calling utimensat on %s with atime %ld, mtime=%ld\n", path, times[0].tv_sec, times[1].tv_sec);
+ res = utimensat(-1, path, times, 0);
+ }
+ getout:
memset(&out, 0, sizeof(out));
node_get_attr(node, &out.attr);
out.attr_valid = 10;
- fuse_reply(fuse, hdr->unique, &out, sizeof(out));
+
+ if (res)
+ fuse_status(fuse, hdr->unique, -errno);
+ else
+ fuse_reply(fuse, hdr->unique, &out, sizeof(out));
return;
}
// case FUSE_READLINK:
@@ -457,6 +642,7 @@ void handle_fuse_request(struct fuse *fuse, struct fuse_in_header *hdr, void *da
char *path, buffer[PATH_BUFFER_SIZE];
char *name = ((char*) data) + sizeof(*req);
int res;
+
TRACE("MKNOD %s @ %llx\n", name, hdr->nodeid);
path = node_get_path(node, buffer, name);
@@ -475,6 +661,7 @@ void handle_fuse_request(struct fuse *fuse, struct fuse_in_header *hdr, void *da
char *path, buffer[PATH_BUFFER_SIZE];
char *name = ((char*) data) + sizeof(*req);
int res;
+
TRACE("MKDIR %s @ %llx 0%o\n", name, hdr->nodeid, req->mode);
path = node_get_path(node, buffer, name);
@@ -511,19 +698,49 @@ void handle_fuse_request(struct fuse *fuse, struct fuse_in_header *hdr, void *da
char *newname = oldname + strlen(oldname) + 1;
char *oldpath, oldbuffer[PATH_BUFFER_SIZE];
char *newpath, newbuffer[PATH_BUFFER_SIZE];
- struct node *newnode;
+ struct node *target;
+ struct node *newparent;
int res;
- newnode = lookup_by_inode(fuse, req->newdir);
- if (!newnode) {
+ TRACE("RENAME %s->%s @ %llx\n", oldname, newname, hdr->nodeid);
+
+ target = lookup_child_by_name(node, oldname);
+ if (!target) {
fuse_status(fuse, hdr->unique, -ENOENT);
return;
}
-
oldpath = node_get_path(node, oldbuffer, oldname);
- newpath = node_get_path(newnode, newbuffer, newname);
+
+ newparent = lookup_by_inode(fuse, req->newdir);
+ if (!newparent) {
+ fuse_status(fuse, hdr->unique, -ENOENT);
+ return;
+ }
+ if (newparent == node) {
+ /* Special case for renaming a file where destination
+ * is same path differing only by case.
+ * In this case we don't want to look for a case insensitive match.
+ * This allows commands like "mv foo FOO" to work as expected.
+ */
+ newpath = do_node_get_path(newparent, newbuffer, newname, NO_CASE_SENSITIVE_MATCH);
+ } else {
+ newpath = node_get_path(newparent, newbuffer, newname);
+ }
+
+ if (!remove_child(node, target->nid)) {
+ ERROR("RENAME remove_child not found");
+ fuse_status(fuse, hdr->unique, -ENOENT);
+ return;
+ }
+ if (!rename_node(target, newname)) {
+ fuse_status(fuse, hdr->unique, -ENOMEM);
+ return;
+ }
+ add_node_to_parent(target, newparent);
res = rename(oldpath, newpath);
+ TRACE("RENAME result %d\n", res);
+
fuse_status(fuse, hdr->unique, res ? -errno : 0);
return;
}
@@ -565,7 +782,7 @@ void handle_fuse_request(struct fuse *fuse, struct fuse_in_header *hdr, void *da
fuse_status(fuse, hdr->unique, -EINVAL);
return;
}
- res = pread(h->fd, buffer, req->size, req->offset);
+ res = pread64(h->fd, buffer, req->size, req->offset);
if (res < 0) {
fuse_status(fuse, hdr->unique, errno);
return;
@@ -579,7 +796,7 @@ void handle_fuse_request(struct fuse *fuse, struct fuse_in_header *hdr, void *da
struct handle *h = id_to_ptr(req->fh);
int res;
TRACE("WRITE %p(%d) %u@%llu\n", h, h->fd, req->size, req->offset);
- res = pwrite(h->fd, ((char*) data) + sizeof(*req), req->size, req->offset);
+ res = pwrite64(h->fd, ((char*) data) + sizeof(*req), req->size, req->offset);
if (res < 0) {
fuse_status(fuse, hdr->unique, errno);
return;
@@ -661,13 +878,19 @@ void handle_fuse_request(struct fuse *fuse, struct fuse_in_header *hdr, void *da
struct dirent *de;
struct dirhandle *h = id_to_ptr(req->fh);
TRACE("READDIR %p\n", h);
+ if (req->offset == 0) {
+ /* rewinddir() might have been called above us, so rewind here too */
+ TRACE("calling rewinddir()\n");
+ rewinddir(h->d);
+ }
de = readdir(h->d);
if (!de) {
fuse_status(fuse, hdr->unique, 0);
return;
}
fde->ino = FUSE_UNKNOWN_INO;
- fde->off = 0;
+ /* increment the offset so we can detect when rewinddir() seeks back to the beginning */
+ fde->off = req->offset + 1;
fde->type = de->d_type;
fde->namelen = strlen(de->d_name);
memcpy(fde->name, de->d_name, fde->namelen + 1);
@@ -695,7 +918,7 @@ void handle_fuse_request(struct fuse *fuse, struct fuse_in_header *hdr, void *da
out.major = FUSE_KERNEL_VERSION;
out.minor = FUSE_KERNEL_MINOR_VERSION;
out.max_readahead = req->max_readahead;
- out.flags = 0;
+ out.flags = FUSE_ATOMIC_O_TRUNC;
out.max_background = 32;
out.congestion_threshold = 32;
out.max_write = 256 * 1024;
@@ -735,30 +958,44 @@ void handle_fuse_requests(struct fuse *fuse)
}
}
+static int usage()
+{
+ ERROR("usage: sdcard [-l -f] <path> <uid> <gid>\n\n\t-l force file names to lower case when creating new files\n\t-f fix up file system before starting (repairs bad file name case and group ownership)\n");
+ return -1;
+}
+
int main(int argc, char **argv)
{
struct fuse fuse;
char opts[256];
int fd;
int res;
- unsigned uid;
- unsigned gid;
- const char *path;
-
- if (argc != 4) {
- ERROR("usage: sdcard <path> <uid> <gid>\n");
- return -1;
+ const char *path = NULL;
+ int i;
+
+ for (i = 1; i < argc; i++) {
+ char* arg = argv[i];
+ if (!path)
+ path = arg;
+ else if (uid == -1)
+ uid = strtoul(arg, 0, 10);
+ else if (gid == -1)
+ gid = strtoul(arg, 0, 10);
+ else {
+ ERROR("too many arguments\n");
+ return usage();
+ }
}
- uid = strtoul(argv[2], 0, 10);
- gid = strtoul(argv[3], 0, 10);
- if (!uid || !gid) {
+ if (!path) {
+ ERROR("no path specified\n");
+ return usage();
+ }
+ if (uid <= 0 || gid <= 0) {
ERROR("uid and gid must be nonzero\n");
- return -1;
+ return usage();
}
- path = argv[1];
-
/* cleanup from previous instance, if necessary */
umount2(MOUNT_POINT, 2);
generated by cgit v1.1 at 2025-06-26 12:01:33 +0000