| 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", "max_xattr" |
| 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 | "multidevs", |
| 62 | "throttling.bps-total", |
| 63 | "throttling.bps-read", |
| 64 | "throttling.bps-write", |
| 65 | "throttling.iops-total", |
| 66 | "throttling.iops-read", |
| 67 | "throttling.iops-write", |
| 68 | "throttling.bps-total-max", |
| 69 | "throttling.bps-read-max", |
| 70 | "throttling.bps-write-max", |
| 71 | "throttling.iops-total-max", |
| 72 | "throttling.iops-read-max", |
| 73 | "throttling.iops-write-max", |
| 74 | "throttling.bps-total-max-length", |
| 75 | "throttling.bps-read-max-length", |
| 76 | "throttling.bps-write-max-length", |
| 77 | "throttling.iops-total-max-length", |
| 78 | "throttling.iops-read-max-length", |
| 79 | "throttling.iops-write-max-length", |
| 80 | "throttling.iops-size", |
| 81 | NULL |
| 82 | }, |
| 83 | }, |
| 84 | { |
| 85 | .name = "synth", |
| 86 | .ops = &synth_ops, |
| 87 | .opts = (const char * []) { |
| 88 | COMMON_FS_DRIVER_OPTIONS, |
| 89 | NULL |
| 90 | }, |
| 91 | }, |
| 92 | }; |
| 93 | |
| 94 | static int validate_opt(void *opaque, const char *name, const char *value, |
| 95 | Error **errp) |
| 96 | { |
| 97 | FsDriverTable *drv = opaque; |
| 98 | const char **opt; |
| 99 | |
| 100 | for (opt = drv->opts; *opt; opt++) { |
| 101 | if (!strcmp(*opt, name)) { |
| 102 | return 0; |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | error_setg(errp, "'%s' is invalid for fsdriver '%s'", name, drv->name); |
| 107 | return -1; |
| 108 | } |
| 109 | |
| 110 | int qemu_fsdev_add(QemuOpts *opts, Error **errp) |
| 111 | { |
| 112 | int i; |
| 113 | struct FsDriverListEntry *fsle; |
| 114 | const char *fsdev_id = qemu_opts_id(opts); |
| 115 | const char *fsdriver = qemu_opt_get(opts, "fsdriver"); |
| 116 | const char *writeout = qemu_opt_get(opts, "writeout"); |
| 117 | bool ro = qemu_opt_get_bool(opts, "readonly", 0); |
| 118 | |
| 119 | if (!fsdev_id) { |
| 120 | error_setg(errp, "fsdev: No id specified"); |
| 121 | return -1; |
| 122 | } |
| 123 | |
| 124 | if (fsdriver) { |
| 125 | for (i = 0; i < ARRAY_SIZE(FsDrivers); i++) { |
| 126 | if (strcmp(FsDrivers[i].name, fsdriver) == 0) { |
| 127 | break; |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | if (i == ARRAY_SIZE(FsDrivers)) { |
| 132 | error_setg(errp, "fsdev: fsdriver %s not found", fsdriver); |
| 133 | return -1; |
| 134 | } |
| 135 | } else { |
| 136 | error_setg(errp, "fsdev: No fsdriver specified"); |
| 137 | return -1; |
| 138 | } |
| 139 | |
| 140 | if (qemu_opt_foreach(opts, validate_opt, &FsDrivers[i], errp)) { |
| 141 | return -1; |
| 142 | } |
| 143 | |
| 144 | fsle = g_malloc0(sizeof(*fsle)); |
| 145 | fsle->fse.fsdev_id = g_strdup(fsdev_id); |
| 146 | fsle->fse.ops = FsDrivers[i].ops; |
| 147 | if (writeout) { |
| 148 | if (!strcmp(writeout, "immediate")) { |
| 149 | fsle->fse.export_flags |= V9FS_IMMEDIATE_WRITEOUT; |
| 150 | } |
| 151 | } |
| 152 | if (ro) { |
| 153 | fsle->fse.export_flags |= V9FS_RDONLY; |
| 154 | } else { |
| 155 | fsle->fse.export_flags &= ~V9FS_RDONLY; |
| 156 | } |
| 157 | |
| 158 | if (fsle->fse.ops->parse_opts) { |
| 159 | if (fsle->fse.ops->parse_opts(opts, &fsle->fse, errp)) { |
| 160 | g_free(fsle->fse.fsdev_id); |
| 161 | g_free(fsle); |
| 162 | return -1; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | QTAILQ_INSERT_TAIL(&fsdriver_entries, fsle, next); |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | FsDriverEntry *get_fsdev_fsentry(char *id) |
| 171 | { |
| 172 | if (id) { |
| 173 | struct FsDriverListEntry *fsle; |
| 174 | |
| 175 | QTAILQ_FOREACH(fsle, &fsdriver_entries, next) { |
| 176 | if (strcmp(fsle->fse.fsdev_id, id) == 0) { |
| 177 | return &fsle->fse; |
| 178 | } |
| 179 | } |
| 180 | } |
| 181 | return NULL; |
| 182 | } |