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* Global variables, needed for all threads but only initialized before any
* FUSE threads are created
*/
const char *appfs_cachedir;
time_t appfs_boottime;
int appfs_fuse_started = 0;
/*
* Global variables for AppFS caching
*/
pthread_mutex_t appfs_path_info_cache_mutex = PTHREAD_MUTEX_INITIALIZER;
int appfs_path_info_cache_size = 8209;
struct appfs_pathinfo *appfs_path_info_cache = NULL;
/*
* AppFS Path Type: Describes the type of path a given file is
*/
typedef enum {
APPFS_PATHTYPE_INVALID,
APPFS_PATHTYPE_DOES_NOT_EXIST,
APPFS_PATHTYPE_FILE,
APPFS_PATHTYPE_DIRECTORY,
APPFS_PATHTYPE_SYMLINK,
APPFS_PATHTYPE_SOCKET,
APPFS_PATHTYPE_FIFO,
} appfs_pathtype_t;
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| ︙ | | |
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off_t size;
} file;
struct {
off_t size;
char source[256];
} symlink;
} typeinfo;
/* Attributes used only for caching entries */
char *_cache_path;
uid_t _cache_uid;
};
/*
* Create a new Tcl interpreter and completely initialize it
*/
static Tcl_Interp *appfs_create_TclInterp(char **error_string) {
Tcl_Interp *interp;
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| ︙ | | |
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-
-
-
-
-
-
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-
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}
retval = strdup(result->pw_dir);
return(retval);
}
/*
* Tcl interface to get the home directory for the user making the "current"
* FUSE I/O request
*/
static int tcl_appfs_get_homedir(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
char *homedir;
Tcl_Obj *homedir_obj;
uid_t fsuid;
static __thread Tcl_Obj *last_homedir_obj = NULL;
static __thread uid_t last_fsuid = -1;
if (objc != 1) {
Tcl_WrongNumArgs(interp, 1, objv, NULL);
return(TCL_ERROR);
}
fsuid = appfs_get_fsuid();
if (fsuid == last_fsuid && last_homedir_obj != NULL) {
homedir_obj = last_homedir_obj;
} else {
homedir = appfs_get_homedir(appfs_get_fsuid());
if (homedir == NULL) {
return(TCL_ERROR);
}
homedir_obj = Tcl_NewStringObj(homedir, -1);
free(homedir);
if (last_homedir_obj != NULL) {
Tcl_DecrRefCount(last_homedir_obj);
}
last_homedir_obj = homedir_obj;
last_fsuid = fsuid;
Tcl_IncrRefCount(last_homedir_obj);
}
Tcl_SetObjResult(interp, homedir_obj);
return(TCL_OK);
}
static int tcl_appfs_simulate_user_fs_enter(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
appfs_simulate_user_fs_enter();
return(TCL_OK);
}
static int tcl_appfs_simulate_user_fs_leave(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
appfs_simulate_user_fs_leave();
return(TCL_OK);
}
static int tcl_appfs_get_fsuid(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
uid_t fsuid;
fsuid = appfs_get_fsuid();
Tcl_SetObjResult(interp, Tcl_NewWideIntObj(fsuid));
return(TCL_OK);
}
static int tcl_appfs_get_fsgid(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
gid_t fsgid;
fsgid = appfs_get_fsgid();
Tcl_SetObjResult(interp, Tcl_NewWideIntObj(fsgid));
return(TCL_OK);
}
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|
+
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|
}
retval += 10;
retval %= 4294967296ULL;
return(retval);
}
/*
* Cache Get Path Info lookups for speed
*/
static int appfs_get_path_info_cache_get(const char *path, uid_t uid, struct appfs_pathinfo *pathinfo) {
unsigned int hash_idx;
int pthread_ret;
int retval;
retval = 1;
pthread_ret = pthread_mutex_lock(&appfs_path_info_cache_mutex);
if (pthread_ret != 0) {
APPFS_DEBUG("Unable to lock path_info cache mutex !");
return(-1);
}
if (appfs_path_info_cache != NULL) {
hash_idx = (appfs_get_path_inode(path) + uid) % appfs_path_info_cache_size;
if (appfs_path_info_cache[hash_idx]._cache_path != NULL) {
if (strcmp(appfs_path_info_cache[hash_idx]._cache_path, path) == 0 && appfs_path_info_cache[hash_idx]._cache_uid == uid) {
retval = 0;
memcpy(pathinfo, &appfs_path_info_cache[hash_idx], sizeof(*pathinfo));
pathinfo->_cache_path = NULL;
}
}
}
pthread_ret = pthread_mutex_unlock(&appfs_path_info_cache_mutex);
if (pthread_ret != 0) {
APPFS_DEBUG("Unable to unlock path_info cache mutex !");
return(-1);
}
if (retval == 0) {
APPFS_DEBUG("Cache hit on %s", path);
} else {
APPFS_DEBUG("Cache miss on %s", path);
}
return(retval);
}
static void appfs_get_path_info_cache_add(const char *path, uid_t uid, struct appfs_pathinfo *pathinfo) {
unsigned int hash_idx;
int pthread_ret;
pthread_ret = pthread_mutex_lock(&appfs_path_info_cache_mutex);
if (pthread_ret != 0) {
APPFS_DEBUG("Unable to lock path_info cache mutex !");
return;
}
if (appfs_path_info_cache == NULL) {
appfs_path_info_cache = calloc(appfs_path_info_cache_size, sizeof(*appfs_path_info_cache));
}
hash_idx = (appfs_get_path_inode(path) + uid) % appfs_path_info_cache_size;
if (appfs_path_info_cache[hash_idx]._cache_path != NULL) {
free(appfs_path_info_cache[hash_idx]._cache_path);
}
memcpy(&appfs_path_info_cache[hash_idx], pathinfo, sizeof(*pathinfo));
appfs_path_info_cache[hash_idx]._cache_path = strdup(path);
appfs_path_info_cache[hash_idx]._cache_uid = uid;
pthread_ret = pthread_mutex_unlock(&appfs_path_info_cache_mutex);
if (pthread_ret != 0) {
APPFS_DEBUG("Unable to unlock path_info cache mutex !");
return;
}
return;
}
static void appfs_get_path_info_cache_rm(const char *path, uid_t uid) {
unsigned int hash_idx;
int pthread_ret;
pthread_ret = pthread_mutex_lock(&appfs_path_info_cache_mutex);
if (pthread_ret != 0) {
APPFS_DEBUG("Unable to lock path_info cache mutex !");
return;
}
if (appfs_path_info_cache != NULL) {
hash_idx = (appfs_get_path_inode(path) + uid) % appfs_path_info_cache_size;
if (appfs_path_info_cache[hash_idx]._cache_path != NULL) {
free(appfs_path_info_cache[hash_idx]._cache_path);
appfs_path_info_cache[hash_idx]._cache_path = NULL;
}
}
pthread_ret = pthread_mutex_unlock(&appfs_path_info_cache_mutex);
if (pthread_ret != 0) {
APPFS_DEBUG("Unable to unlock path_info cache mutex !");
return;
}
return;
}
static void appfs_get_path_info_cache_flush(uid_t uid, int new_size) {
unsigned int idx;
int pthread_ret;
pthread_ret = pthread_mutex_lock(&appfs_path_info_cache_mutex);
if (pthread_ret != 0) {
APPFS_DEBUG("Unable to lock path_info cache mutex !");
return;
}
if (appfs_path_info_cache != NULL) {
for (idx = 0; idx < appfs_path_info_cache_size; idx++) {
if (appfs_path_info_cache[idx]._cache_path != NULL) {
if (uid != ((uid_t) -1)) {
if (appfs_path_info_cache[idx]._cache_uid != uid) {
continue;
}
}
free(appfs_path_info_cache[idx]._cache_path);
appfs_path_info_cache[idx]._cache_path = NULL;
}
}
}
if (uid == ((uid_t) -1)) {
free(appfs_path_info_cache);
appfs_path_info_cache = NULL;
if (new_size != -1) {
appfs_path_info_cache_size = new_size;
}
}
pthread_ret = pthread_mutex_unlock(&appfs_path_info_cache_mutex);
if (pthread_ret != 0) {
APPFS_DEBUG("Unable to unlock path_info cache mutex !");
return;
}
return;
}
/* Get information about a path, and optionally list children */
static int appfs_get_path_info(const char *path, struct appfs_pathinfo *pathinfo) {
Tcl_Interp *interp;
Tcl_Obj *attrs_dict, *attr_value;
const char *attr_value_str;
Tcl_WideInt attr_value_wide;
int attr_value_int;
static __thread Tcl_Obj *attr_key_type = NULL, *attr_key_perms = NULL, *attr_key_size = NULL, *attr_key_time = NULL, *attr_key_source = NULL, *attr_key_childcount = NULL, *attr_key_packaged = NULL;
int cache_ret;
int tcl_ret;
cache_ret = appfs_get_path_info_cache_get(path, appfs_get_fsuid(), pathinfo);
if (cache_ret == 0) {
if (pathinfo->type == APPFS_PATHTYPE_DOES_NOT_EXIST) {
return(-ENOENT);
}
if (pathinfo->type == APPFS_PATHTYPE_INVALID) {
return(-EIO);
}
return(0);
}
interp = appfs_TclInterp();
if (interp == NULL) {
return(-EIO);
}
tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::getattr", path);
if (tcl_ret != TCL_OK) {
APPFS_DEBUG("::appfs::getattr(%s) failed.", path);
APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));
pathinfo->type = APPFS_PATHTYPE_DOES_NOT_EXIST;
appfs_get_path_info_cache_add(path, appfs_get_fsuid(), pathinfo);
return(-ENOENT);
}
if (attr_key_type == NULL) {
attr_key_type = Tcl_NewStringObj("type", -1);
attr_key_perms = Tcl_NewStringObj("perms", -1);
attr_key_size = Tcl_NewStringObj("size", -1);
|
| ︙ | | |
631
632
633
634
635
636
637
638
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641
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651
|
742
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749
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751
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753
754
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757
758
759
760
761
762
763
764
765
766
|
+
+
+
+
|
if (tcl_ret == TCL_OK) {
pathinfo->time = attr_value_wide;
}
} else {
pathinfo->time = 0;
}
appfs_get_path_info_cache_add(path, appfs_get_fsuid(), pathinfo);
return(0);
}
static char *appfs_prepare_to_create(const char *path) {
Tcl_Interp *interp;
const char *real_path;
int tcl_ret;
appfs_get_path_info_cache_flush(appfs_get_fsuid(), -1);
interp = appfs_TclInterp();
if (interp == NULL) {
return(NULL);
}
tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::prepare_to_create", path);
|
| ︙ | | |
765
766
767
768
769
770
771
772
773
774
775
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779
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781
|
880
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889
890
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892
893
894
895
896
897
898
899
900
|
-
+
+
+
+
+
|
stbuf->st_size = 0;
break;
case APPFS_PATHTYPE_FIFO:
stbuf->st_mode = S_IFIFO | 0555;
stbuf->st_nlink = 1;
stbuf->st_size = 0;
break;
case APPFS_PATHTYPE_INVALID:
case APPFS_PATHTYPE_DOES_NOT_EXIST:
retval = -ENOENT;
break;
case APPFS_PATHTYPE_INVALID:
retval = -EIO;
break;
}
if (pathinfo.packaged) {
stbuf->st_uid = appfs_get_fsuid();
stbuf->st_gid = appfs_get_fsgid();
stbuf->st_mode |= 0200;
|
| ︙ | | |
837
838
839
840
841
842
843
844
845
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847
848
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850
|
956
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962
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964
965
966
967
968
969
970
971
972
973
974
975
|
+
+
+
+
+
+
|
if ((fi->flags & (O_WRONLY|O_CREAT)) == (O_CREAT|O_WRONLY)) {
/* The file will be created if it does not exist */
if (gpi_ret != 0 && gpi_ret != -ENOENT) {
return(gpi_ret);
}
mode = "create";
/*
* We have to clear the cache here so that the number of
* links gets maintained on the parent directory
*/
appfs_get_path_info_cache_flush(appfs_get_fsuid(), -1);
} else {
/* The file must already exist */
if (gpi_ret != 0) {
return(gpi_ret);
}
mode = "";
|
| ︙ | | |
888
889
890
891
892
893
894
895
896
897
898
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901
|
1013
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1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
|
+
+
|
return(0);
}
static int appfs_fuse_close(const char *path, struct fuse_file_info *fi) {
int close_ret;
appfs_get_path_info_cache_rm(path, appfs_get_fsuid());
close_ret = close(fi->fh);
if (close_ret != 0) {
return(-EIO);
}
return(0);
}
|
| ︙ | | |
917
918
919
920
921
922
923
924
925
926
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|
1044
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1051
1052
1053
1054
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1056
1057
1058
1059
|
+
+
|
}
static int appfs_fuse_write(const char *path, const char *buf, size_t size, off_t offset, struct fuse_file_info *fi) {
off_t lseek_ret;
ssize_t write_ret;
APPFS_DEBUG("Enter (path = %s, ...)", path);
appfs_get_path_info_cache_rm(path, appfs_get_fsuid());
lseek_ret = lseek(fi->fh, offset, SEEK_SET);
if (lseek_ret != offset) {
return(-EIO);
}
write_ret = write(fi->fh, buf, size);
|
| ︙ | | |
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
|
1138
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1141
1142
1143
1144
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1147
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1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
|
+
+
+
+
|
APPFS_DEBUG("Enter (path = %s, ...)", path);
real_path = appfs_localpath(path);
if (real_path == NULL) {
return(-EIO);
}
appfs_get_path_info_cache_rm(path, appfs_get_fsuid());
appfs_simulate_user_fs_enter();
truncate_ret = truncate(real_path, size);
appfs_simulate_user_fs_leave();
free(real_path);
if (truncate_ret != 0) {
return(errno * -1);
}
return(0);
}
static int appfs_fuse_unlink_rmdir(const char *path) {
Tcl_Interp *interp;
int tcl_ret;
APPFS_DEBUG("Enter (path = %s, ...)", path);
appfs_get_path_info_cache_flush(appfs_get_fsuid(), -1);
interp = appfs_TclInterp();
if (interp == NULL) {
return(-EIO);
}
tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::unlinkpath", path);
|
| ︙ | | |
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
|
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
|
-
|
}
static int appfs_fuse_mkdir(const char *path, mode_t mode) {
char *real_path;
int mkdir_ret;
APPFS_DEBUG("Enter (path = %s, ...)", path);
|
| ︙ | | |
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
|
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
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static int appfs_fuse_chmod(const char *path, mode_t mode) {
Tcl_Interp *interp;
const char *real_path;
int tcl_ret, chmod_ret;
APPFS_DEBUG("Enter (path = %s, ...)", path);
appfs_get_path_info_cache_rm(path, appfs_get_fsuid());
interp = appfs_TclInterp();
if (interp == NULL) {
return(-EIO);
}
tcl_ret = appfs_Tcl_Eval(interp, 3, "::appfs::openpath", path, "write");
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}
/*
* AppFSd Package for Tcl:
* Bridge for I/O operations to request information about the current
* transaction
*/
/*
* Tcl interface to get the home directory for the user making the "current"
* FUSE I/O request
*/
static int tcl_appfs_get_homedir(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
char *homedir;
Tcl_Obj *homedir_obj;
uid_t fsuid;
static __thread Tcl_Obj *last_homedir_obj = NULL;
static __thread uid_t last_fsuid = -1;
if (objc != 1) {
Tcl_WrongNumArgs(interp, 1, objv, NULL);
return(TCL_ERROR);
}
fsuid = appfs_get_fsuid();
if (fsuid == last_fsuid && last_homedir_obj != NULL) {
homedir_obj = last_homedir_obj;
} else {
homedir = appfs_get_homedir(appfs_get_fsuid());
if (homedir == NULL) {
return(TCL_ERROR);
}
homedir_obj = Tcl_NewStringObj(homedir, -1);
free(homedir);
if (last_homedir_obj != NULL) {
Tcl_DecrRefCount(last_homedir_obj);
}
last_homedir_obj = homedir_obj;
last_fsuid = fsuid;
Tcl_IncrRefCount(last_homedir_obj);
}
Tcl_SetObjResult(interp, homedir_obj);
return(TCL_OK);
}
static int tcl_appfs_simulate_user_fs_enter(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
appfs_simulate_user_fs_enter();
return(TCL_OK);
}
static int tcl_appfs_simulate_user_fs_leave(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
appfs_simulate_user_fs_leave();
return(TCL_OK);
}
static int tcl_appfs_get_fsuid(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
uid_t fsuid;
fsuid = appfs_get_fsuid();
Tcl_SetObjResult(interp, Tcl_NewWideIntObj(fsuid));
return(TCL_OK);
}
static int tcl_appfs_get_fsgid(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
gid_t fsgid;
fsgid = appfs_get_fsgid();
Tcl_SetObjResult(interp, Tcl_NewWideIntObj(fsgid));
return(TCL_OK);
}
static int tcl_appfs_get_path_info_cache_flush(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
int tcl_ret;
int new_size;
new_size = -1;
if (objc == 2) {
tcl_ret = Tcl_GetIntFromObj(interp, objv[1], &new_size);
if (tcl_ret != TCL_OK) {
return(tcl_ret);
}
} else if (objc > 2 || objc < 1) {
Tcl_WrongNumArgs(interp, 1, objv, "?new_cache_size?");
return(TCL_ERROR);
}
appfs_get_path_info_cache_flush(-1, new_size);
return(TCL_OK);
}
static int Appfsd_Init(Tcl_Interp *interp) {
#ifdef USE_TCL_STUBS
if (Tcl_InitStubs(interp, TCL_VERSION, 0) == 0L) {
return(TCL_ERROR);
}
#endif
Tcl_CreateObjCommand(interp, "appfsd::get_homedir", tcl_appfs_get_homedir, NULL, NULL);
Tcl_CreateObjCommand(interp, "appfsd::get_fsuid", tcl_appfs_get_fsuid, NULL, NULL);
Tcl_CreateObjCommand(interp, "appfsd::get_fsgid", tcl_appfs_get_fsgid, NULL, NULL);
Tcl_CreateObjCommand(interp, "appfsd::simulate_user_fs_enter", tcl_appfs_simulate_user_fs_enter, NULL, NULL);
Tcl_CreateObjCommand(interp, "appfsd::simulate_user_fs_leave", tcl_appfs_simulate_user_fs_leave, NULL, NULL);
Tcl_CreateObjCommand(interp, "appfsd::get_path_info_cache_flush", tcl_appfs_get_path_info_cache_flush, NULL, NULL);
Tcl_PkgProvide(interp, "appfsd", "1.0");
return(TCL_OK);
}
/*
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