1 /* 2 * 9p 3 * 4 * Copyright IBM, Corp. 2010 5 * 6 * Authors: 7 * Gautham R Shenoy <ego@in.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 */ 12 13 #include "qemu/osdep.h" 14 #include "qapi/error.h" 15 #include "qemu-fsdev.h" 16 #include "qemu/queue.h" 17 #include "qemu/config-file.h" 18 #include "qemu/error-report.h" 19 #include "qemu/option.h" 20 21 /* 22 * A table to store the various file systems and their callback operations. 23 * ----------------- 24 * fstype | ops 25 * ----------------- 26 * local | local_ops 27 * . | 28 * . | 29 * . | 30 * . | 31 * ----------------- 32 * etc 33 */ 34 typedef struct FsDriverTable { 35 const char *name; 36 FileOperations *ops; 37 const char **opts; 38 } FsDriverTable; 39 40 typedef struct FsDriverListEntry { 41 FsDriverEntry fse; 42 QTAILQ_ENTRY(FsDriverListEntry) next; 43 } FsDriverListEntry; 44 45 static QTAILQ_HEAD(, FsDriverListEntry) fsdriver_entries = 46 QTAILQ_HEAD_INITIALIZER(fsdriver_entries); 47 48 #define COMMON_FS_DRIVER_OPTIONS "id", "fsdriver", "readonly" 49 50 static FsDriverTable FsDrivers[] = { 51 { 52 .name = "local", 53 .ops = &local_ops, 54 .opts = (const char * []) { 55 COMMON_FS_DRIVER_OPTIONS, 56 "security_model", 57 "path", 58 "writeout", 59 "fmode", 60 "dmode", 61 "throttling.bps-total", 62 "throttling.bps-read", 63 "throttling.bps-write", 64 "throttling.iops-total", 65 "throttling.iops-read", 66 "throttling.iops-write", 67 "throttling.bps-total-max", 68 "throttling.bps-read-max", 69 "throttling.bps-write-max", 70 "throttling.iops-total-max", 71 "throttling.iops-read-max", 72 "throttling.iops-write-max", 73 "throttling.bps-total-max-length", 74 "throttling.bps-read-max-length", 75 "throttling.bps-write-max-length", 76 "throttling.iops-total-max-length", 77 "throttling.iops-read-max-length", 78 "throttling.iops-write-max-length", 79 "throttling.iops-size", 80 }, 81 }, 82 { 83 .name = "synth", 84 .ops = &synth_ops, 85 .opts = (const char * []) { 86 COMMON_FS_DRIVER_OPTIONS, 87 }, 88 }, 89 { 90 .name = "proxy", 91 .ops = &proxy_ops, 92 .opts = (const char * []) { 93 COMMON_FS_DRIVER_OPTIONS, 94 "socket", 95 "sock_fd", 96 "writeout", 97 }, 98 }, 99 }; 100 101 static int validate_opt(void *opaque, const char *name, const char *value, 102 Error **errp) 103 { 104 FsDriverTable *drv = opaque; 105 const char **opt; 106 107 for (opt = drv->opts; *opt; opt++) { 108 if (!strcmp(*opt, name)) { 109 return 0; 110 } 111 } 112 113 error_setg(errp, "'%s' is invalid for fsdriver '%s'", name, drv->name); 114 return -1; 115 } 116 117 int qemu_fsdev_add(QemuOpts *opts, Error **errp) 118 { 119 int i; 120 struct FsDriverListEntry *fsle; 121 const char *fsdev_id = qemu_opts_id(opts); 122 const char *fsdriver = qemu_opt_get(opts, "fsdriver"); 123 const char *writeout = qemu_opt_get(opts, "writeout"); 124 bool ro = qemu_opt_get_bool(opts, "readonly", 0); 125 126 if (!fsdev_id) { 127 error_setg(errp, "fsdev: No id specified"); 128 return -1; 129 } 130 131 if (fsdriver) { 132 for (i = 0; i < ARRAY_SIZE(FsDrivers); i++) { 133 if (strcmp(FsDrivers[i].name, fsdriver) == 0) { 134 break; 135 } 136 } 137 138 if (i == ARRAY_SIZE(FsDrivers)) { 139 error_setg(errp, "fsdev: fsdriver %s not found", fsdriver); 140 return -1; 141 } 142 } else { 143 error_setg(errp, "fsdev: No fsdriver specified"); 144 return -1; 145 } 146 147 if (qemu_opt_foreach(opts, validate_opt, &FsDrivers[i], errp)) { 148 return -1; 149 } 150 151 fsle = g_malloc0(sizeof(*fsle)); 152 fsle->fse.fsdev_id = g_strdup(fsdev_id); 153 fsle->fse.ops = FsDrivers[i].ops; 154 if (writeout) { 155 if (!strcmp(writeout, "immediate")) { 156 fsle->fse.export_flags |= V9FS_IMMEDIATE_WRITEOUT; 157 } 158 } 159 if (ro) { 160 fsle->fse.export_flags |= V9FS_RDONLY; 161 } else { 162 fsle->fse.export_flags &= ~V9FS_RDONLY; 163 } 164 165 if (fsle->fse.ops->parse_opts) { 166 if (fsle->fse.ops->parse_opts(opts, &fsle->fse, errp)) { 167 g_free(fsle->fse.fsdev_id); 168 g_free(fsle); 169 return -1; 170 } 171 } 172 173 QTAILQ_INSERT_TAIL(&fsdriver_entries, fsle, next); 174 return 0; 175 } 176 177 FsDriverEntry *get_fsdev_fsentry(char *id) 178 { 179 if (id) { 180 struct FsDriverListEntry *fsle; 181 182 QTAILQ_FOREACH(fsle, &fsdriver_entries, next) { 183 if (strcmp(fsle->fse.fsdev_id, id) == 0) { 184 return &fsle->fse; 185 } 186 } 187 } 188 return NULL; 189 } 190