^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (c) International Business Machines Corp., 2006
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Author: Artem Bityutskiy (Битюцкий Артём), Joern Engel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * This is a small driver which implements fake MTD devices on top of UBI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * volumes. This sounds strange, but it is in fact quite useful to make
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * MTD-oriented software (including all the legacy software) work on top of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * UBI.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Gluebi emulates MTD devices of "MTD_UBIVOLUME" type. Their minimal I/O unit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * size (@mtd->writesize) is equivalent to the UBI minimal I/O unit. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * eraseblock size is equivalent to the logical eraseblock size of the volume.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/math64.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/mtd/ubi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/mtd/mtd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include "ubi-media.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define err_msg(fmt, ...) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) pr_err("gluebi (pid %d): %s: " fmt "\n", \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) current->pid, __func__, ##__VA_ARGS__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * struct gluebi_device - a gluebi device description data structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * @mtd: emulated MTD device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * @refcnt: gluebi device reference count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * @desc: UBI volume descriptor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * @ubi_num: UBI device number this gluebi device works on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * @vol_id: ID of UBI volume this gluebi device works on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * @list: link in a list of gluebi devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct gluebi_device {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct mtd_info mtd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) int refcnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct ubi_volume_desc *desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int ubi_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) int vol_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) /* List of all gluebi devices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) static LIST_HEAD(gluebi_devices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static DEFINE_MUTEX(devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * find_gluebi_nolock - find a gluebi device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * @ubi_num: UBI device number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * @vol_id: volume ID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * This function seraches for gluebi device corresponding to UBI device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * @ubi_num and UBI volume @vol_id. Returns the gluebi device description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * object in case of success and %NULL in case of failure. The caller has to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * have the &devices_mutex locked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) static struct gluebi_device *find_gluebi_nolock(int ubi_num, int vol_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct gluebi_device *gluebi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) list_for_each_entry(gluebi, &gluebi_devices, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (gluebi->ubi_num == ubi_num && gluebi->vol_id == vol_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return gluebi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * gluebi_get_device - get MTD device reference.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * @mtd: the MTD device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * This function is called every time the MTD device is being opened and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * implements the MTD get_device() operation. Returns zero in case of success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * and a negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static int gluebi_get_device(struct mtd_info *mtd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) struct gluebi_device *gluebi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) int ubi_mode = UBI_READONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (mtd->flags & MTD_WRITEABLE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) ubi_mode = UBI_READWRITE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) gluebi = container_of(mtd, struct gluebi_device, mtd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) mutex_lock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (gluebi->refcnt > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * The MTD device is already referenced and this is just one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * more reference. MTD allows many users to open the same
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * volume simultaneously and do not distinguish between
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * readers/writers/exclusive/meta openers as UBI does. So we do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * not open the UBI volume again - just increase the reference
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * counter and return.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) gluebi->refcnt += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) mutex_unlock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * This is the first reference to this UBI volume via the MTD device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * interface. Open the corresponding volume in read-write mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) gluebi->desc = ubi_open_volume(gluebi->ubi_num, gluebi->vol_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) ubi_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (IS_ERR(gluebi->desc)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) mutex_unlock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return PTR_ERR(gluebi->desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) gluebi->refcnt += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) mutex_unlock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * gluebi_put_device - put MTD device reference.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) * @mtd: the MTD device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * This function is called every time the MTD device is being put. Returns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * zero in case of success and a negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static void gluebi_put_device(struct mtd_info *mtd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) struct gluebi_device *gluebi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) gluebi = container_of(mtd, struct gluebi_device, mtd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) mutex_lock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) gluebi->refcnt -= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (gluebi->refcnt == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) ubi_close_volume(gluebi->desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) mutex_unlock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) * gluebi_read - read operation of emulated MTD devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * @mtd: MTD device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) * @from: absolute offset from where to read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * @len: how many bytes to read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * @retlen: count of read bytes is returned here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) * @buf: buffer to store the read data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * This function returns zero in case of success and a negative error code in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) * case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static int gluebi_read(struct mtd_info *mtd, loff_t from, size_t len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) size_t *retlen, unsigned char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) int err = 0, lnum, offs, bytes_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) struct gluebi_device *gluebi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) gluebi = container_of(mtd, struct gluebi_device, mtd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) lnum = div_u64_rem(from, mtd->erasesize, &offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) bytes_left = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) while (bytes_left) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) size_t to_read = mtd->erasesize - offs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (to_read > bytes_left)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) to_read = bytes_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) err = ubi_read(gluebi->desc, lnum, buf, offs, to_read);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) lnum += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) offs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) bytes_left -= to_read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) buf += to_read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) *retlen = len - bytes_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * gluebi_write - write operation of emulated MTD devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) * @mtd: MTD device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) * @to: absolute offset where to write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) * @len: how many bytes to write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * @retlen: count of written bytes is returned here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) * @buf: buffer with data to write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * This function returns zero in case of success and a negative error code in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) * case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) static int gluebi_write(struct mtd_info *mtd, loff_t to, size_t len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) size_t *retlen, const u_char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) int err = 0, lnum, offs, bytes_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) struct gluebi_device *gluebi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) gluebi = container_of(mtd, struct gluebi_device, mtd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) lnum = div_u64_rem(to, mtd->erasesize, &offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (len % mtd->writesize || offs % mtd->writesize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) bytes_left = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) while (bytes_left) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) size_t to_write = mtd->erasesize - offs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) if (to_write > bytes_left)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) to_write = bytes_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) err = ubi_leb_write(gluebi->desc, lnum, buf, offs, to_write);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) lnum += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) offs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) bytes_left -= to_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) buf += to_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) *retlen = len - bytes_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) * gluebi_erase - erase operation of emulated MTD devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) * @mtd: the MTD device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) * @instr: the erase operation description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) * This function calls the erase callback when finishes. Returns zero in case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) * of success and a negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) static int gluebi_erase(struct mtd_info *mtd, struct erase_info *instr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) int err, i, lnum, count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) struct gluebi_device *gluebi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) if (mtd_mod_by_ws(instr->addr, mtd) || mtd_mod_by_ws(instr->len, mtd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) lnum = mtd_div_by_eb(instr->addr, mtd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) count = mtd_div_by_eb(instr->len, mtd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) gluebi = container_of(mtd, struct gluebi_device, mtd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) for (i = 0; i < count - 1; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) err = ubi_leb_unmap(gluebi->desc, lnum + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * MTD erase operations are synchronous, so we have to make sure the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) * physical eraseblock is wiped out.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) * Thus, perform leb_erase instead of leb_unmap operation - leb_erase
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * will wait for the end of operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) err = ubi_leb_erase(gluebi->desc, lnum + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) out_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) instr->fail_addr = (long long)lnum * mtd->erasesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) * gluebi_create - create a gluebi device for an UBI volume.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) * @di: UBI device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) * @vi: UBI volume description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) * This function is called when a new UBI volume is created in order to create
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) * corresponding fake MTD device. Returns zero in case of success and a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) * negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static int gluebi_create(struct ubi_device_info *di,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) struct ubi_volume_info *vi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) struct gluebi_device *gluebi, *g;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) struct mtd_info *mtd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) gluebi = kzalloc(sizeof(struct gluebi_device), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) if (!gluebi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) mtd = &gluebi->mtd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) mtd->name = kmemdup(vi->name, vi->name_len + 1, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) if (!mtd->name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) kfree(gluebi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) gluebi->vol_id = vi->vol_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) gluebi->ubi_num = vi->ubi_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) mtd->type = MTD_UBIVOLUME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) if (!di->ro_mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) mtd->flags = MTD_WRITEABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) mtd->owner = THIS_MODULE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) mtd->writesize = di->min_io_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) mtd->erasesize = vi->usable_leb_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) mtd->_read = gluebi_read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) mtd->_write = gluebi_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) mtd->_erase = gluebi_erase;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) mtd->_get_device = gluebi_get_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) mtd->_put_device = gluebi_put_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * In case of dynamic a volume, MTD device size is just volume size. In
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) * case of a static volume the size is equivalent to the amount of data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) * bytes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (vi->vol_type == UBI_DYNAMIC_VOLUME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) mtd->size = (unsigned long long)vi->usable_leb_size * vi->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) mtd->size = vi->used_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) /* Just a sanity check - make sure this gluebi device does not exist */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) mutex_lock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) g = find_gluebi_nolock(vi->ubi_num, vi->vol_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) if (g)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) err_msg("gluebi MTD device %d form UBI device %d volume %d already exists",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) g->mtd.index, vi->ubi_num, vi->vol_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) mutex_unlock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) if (mtd_device_register(mtd, NULL, 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) err_msg("cannot add MTD device");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) kfree(mtd->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) kfree(gluebi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) return -ENFILE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) mutex_lock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) list_add_tail(&gluebi->list, &gluebi_devices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) mutex_unlock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) * gluebi_remove - remove a gluebi device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) * @vi: UBI volume description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * This function is called when an UBI volume is removed and it removes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * corresponding fake MTD device. Returns zero in case of success and a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) * negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) static int gluebi_remove(struct ubi_volume_info *vi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) struct mtd_info *mtd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) struct gluebi_device *gluebi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) mutex_lock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if (!gluebi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) err_msg("got remove notification for unknown UBI device %d volume %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) vi->ubi_num, vi->vol_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) err = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) } else if (gluebi->refcnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) err = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) list_del(&gluebi->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) mutex_unlock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) mtd = &gluebi->mtd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) err = mtd_device_unregister(mtd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) err_msg("cannot remove fake MTD device %d, UBI device %d, volume %d, error %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) mtd->index, gluebi->ubi_num, gluebi->vol_id, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) mutex_lock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) list_add_tail(&gluebi->list, &gluebi_devices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) mutex_unlock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) kfree(mtd->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) kfree(gluebi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) * gluebi_updated - UBI volume was updated notifier.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) * @vi: volume info structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) * This function is called every time an UBI volume is updated. It does nothing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) * if te volume @vol is dynamic, and changes MTD device size if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) * volume is static. This is needed because static volumes cannot be read past
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) * data they contain. This function returns zero in case of success and a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) * negative error code in case of error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) static int gluebi_updated(struct ubi_volume_info *vi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) struct gluebi_device *gluebi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) mutex_lock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) if (!gluebi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) mutex_unlock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) err_msg("got update notification for unknown UBI device %d volume %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) vi->ubi_num, vi->vol_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) if (vi->vol_type == UBI_STATIC_VOLUME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) gluebi->mtd.size = vi->used_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) mutex_unlock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) * gluebi_resized - UBI volume was re-sized notifier.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) * @vi: volume info structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) * This function is called every time an UBI volume is re-size. It changes the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * corresponding fake MTD device size. This function returns zero in case of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * success and a negative error code in case of error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) static int gluebi_resized(struct ubi_volume_info *vi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) struct gluebi_device *gluebi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) mutex_lock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) if (!gluebi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) mutex_unlock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) err_msg("got update notification for unknown UBI device %d volume %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) vi->ubi_num, vi->vol_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) gluebi->mtd.size = vi->used_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) mutex_unlock(&devices_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) * gluebi_notify - UBI notification handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) * @nb: registered notifier block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) * @l: notification type
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) * @ptr: pointer to the &struct ubi_notification object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) static int gluebi_notify(struct notifier_block *nb, unsigned long l,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) void *ns_ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) struct ubi_notification *nt = ns_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) switch (l) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) case UBI_VOLUME_ADDED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) gluebi_create(&nt->di, &nt->vi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) case UBI_VOLUME_REMOVED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) gluebi_remove(&nt->vi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) case UBI_VOLUME_RESIZED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) gluebi_resized(&nt->vi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) case UBI_VOLUME_UPDATED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) gluebi_updated(&nt->vi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) return NOTIFY_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) static struct notifier_block gluebi_notifier = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) .notifier_call = gluebi_notify,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) static int __init ubi_gluebi_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) return ubi_register_volume_notifier(&gluebi_notifier, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) static void __exit ubi_gluebi_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) struct gluebi_device *gluebi, *g;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) list_for_each_entry_safe(gluebi, g, &gluebi_devices, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) struct mtd_info *mtd = &gluebi->mtd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) err = mtd_device_unregister(mtd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) err_msg("error %d while removing gluebi MTD device %d, UBI device %d, volume %d - ignoring",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) err, mtd->index, gluebi->ubi_num,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) gluebi->vol_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) kfree(mtd->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) kfree(gluebi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) ubi_unregister_volume_notifier(&gluebi_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) module_init(ubi_gluebi_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) module_exit(ubi_gluebi_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) MODULE_DESCRIPTION("MTD emulation layer over UBI volumes");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) MODULE_AUTHOR("Artem Bityutskiy, Joern Engel");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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