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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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/* * This file includes implementation of UBI character device operations. * * There are two kinds of character devices in UBI: UBI character devices and * UBI volume character devices. UBI character devices allow users to * manipulate whole volumes: create, remove, and re-size them. Volume character * devices provide volume I/O capabilities. * * Major and minor numbers are assigned dynamically to both UBI and volume * character devices. * * Well, there is the third kind of character devices - the UBI control * character device, which allows to manipulate by UBI devices - create and * delete them. In other words, it is used for attaching and detaching MTD * devices. */
#include <linux/module.h>#include <linux/stat.h>#include <linux/slab.h>#include <linux/ioctl.h>#include <linux/capability.h>#include <linux/uaccess.h>#include <linux/compat.h>#include <linux/math64.h>#include <mtd/ubi-user.h>#include "ubi.h"
/** * get_exclusive - get exclusive access to an UBI volume. * @desc: volume descriptor * * This function changes UBI volume open mode to "exclusive". Returns previous * mode value (positive integer) in case of success and a negative error code * in case of failure. */static int get_exclusive(struct ubi_volume_desc *desc){ int users, err; struct ubi_volume *vol = desc->vol;
spin_lock(&vol->ubi->volumes_lock); users = vol->readers + vol->writers + vol->exclusive + vol->metaonly; ubi_assert(users > 0); if (users > 1) { ubi_err(vol->ubi, "%d users for volume %d", users, vol->vol_id); err = -EBUSY; } else { vol->readers = vol->writers = vol->metaonly = 0; vol->exclusive = 1; err = desc->mode; desc->mode = UBI_EXCLUSIVE; } spin_unlock(&vol->ubi->volumes_lock);
return err;}
/** * revoke_exclusive - revoke exclusive mode. * @desc: volume descriptor * @mode: new mode to switch to */static void revoke_exclusive(struct ubi_volume_desc *desc, int mode){ struct ubi_volume *vol = desc->vol;
spin_lock(&vol->ubi->volumes_lock); ubi_assert(vol->readers == 0 && vol->writers == 0 && vol->metaonly == 0); ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE); vol->exclusive = 0; if (mode == UBI_READONLY) vol->readers = 1; else if (mode == UBI_READWRITE) vol->writers = 1; else if (mode == UBI_METAONLY) vol->metaonly = 1; else vol->exclusive = 1; spin_unlock(&vol->ubi->volumes_lock);
desc->mode = mode;}
static int vol_cdev_open(struct inode *inode, struct file *file){ struct ubi_volume_desc *desc; int vol_id = iminor(inode) - 1, mode, ubi_num;
ubi_num = ubi_major2num(imajor(inode)); if (ubi_num < 0) return ubi_num;
if (file->f_mode & FMODE_WRITE) mode = UBI_READWRITE; else mode = UBI_READONLY;
dbg_gen("open device %d, volume %d, mode %d", ubi_num, vol_id, mode);
desc = ubi_open_volume(ubi_num, vol_id, mode); if (IS_ERR(desc)) return PTR_ERR(desc);
file->private_data = desc; return 0;}
static int vol_cdev_release(struct inode *inode, struct file *file){ struct ubi_volume_desc *desc = file->private_data; struct ubi_volume *vol = desc->vol;
dbg_gen("release device %d, volume %d, mode %d", vol->ubi->ubi_num, vol->vol_id, desc->mode);
if (vol->updating) { ubi_warn(vol->ubi, "update of volume %d not finished, volume is damaged", vol->vol_id); ubi_assert(!vol->changing_leb); vol->updating = 0; vfree(vol->upd_buf); } else if (vol->changing_leb) { dbg_gen("only %lld of %lld bytes received for atomic LEB change for volume %d:%d, cancel", vol->upd_received, vol->upd_bytes, vol->ubi->ubi_num, vol->vol_id); vol->changing_leb = 0; vfree(vol->upd_buf); }
ubi_close_volume(desc); return 0;}
static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin){ struct ubi_volume_desc *desc = file->private_data; struct ubi_volume *vol = desc->vol;
if (vol->updating) { /* Update is in progress, seeking is prohibited */ ubi_err(vol->ubi, "updating"); return -EBUSY; }
return fixed_size_llseek(file, offset, origin, vol->used_bytes);}
static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end, int datasync){ struct ubi_volume_desc *desc = file->private_data; struct ubi_device *ubi = desc->vol->ubi; struct inode *inode = file_inode(file); int err; inode_lock(inode); err = ubi_sync(ubi->ubi_num); inode_unlock(inode); return err;}
static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count, loff_t *offp){ struct ubi_volume_desc *desc = file->private_data; struct ubi_volume *vol = desc->vol; struct ubi_device *ubi = vol->ubi; int err, lnum, off, len, tbuf_size; size_t count_save = count; void *tbuf;
dbg_gen("read %zd bytes from offset %lld of volume %d", count, *offp, vol->vol_id);
if (vol->updating) { ubi_err(vol->ubi, "updating"); return -EBUSY; } if (vol->upd_marker) { ubi_err(vol->ubi, "damaged volume, update marker is set"); return -EBADF; } if (*offp == vol->used_bytes || count == 0) return 0;
if (vol->corrupted) dbg_gen("read from corrupted volume %d", vol->vol_id);
if (*offp + count > vol->used_bytes) count_save = count = vol->used_bytes - *offp;
tbuf_size = vol->usable_leb_size; if (count < tbuf_size) tbuf_size = ALIGN(count, ubi->min_io_size); tbuf = vmalloc(tbuf_size); if (!tbuf) return -ENOMEM;
len = count > tbuf_size ? tbuf_size : count; lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);
do { cond_resched();
if (off + len >= vol->usable_leb_size) len = vol->usable_leb_size - off;
err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0); if (err) break;
off += len; if (off == vol->usable_leb_size) { lnum += 1; off -= vol->usable_leb_size; }
count -= len; *offp += len;
err = copy_to_user(buf, tbuf, len); if (err) { err = -EFAULT; break; }
buf += len; len = count > tbuf_size ? tbuf_size : count; } while (count);
vfree(tbuf); return err ? err : count_save - count;}
/* * This function allows to directly write to dynamic UBI volumes, without * issuing the volume update operation. */static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf, size_t count, loff_t *offp){ struct ubi_volume_desc *desc = file->private_data; struct ubi_volume *vol = desc->vol; struct ubi_device *ubi = vol->ubi; int lnum, off, len, tbuf_size, err = 0; size_t count_save = count; char *tbuf;
if (!vol->direct_writes) return -EPERM;
dbg_gen("requested: write %zd bytes to offset %lld of volume %u", count, *offp, vol->vol_id);
if (vol->vol_type == UBI_STATIC_VOLUME) return -EROFS;
lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); if (off & (ubi->min_io_size - 1)) { ubi_err(ubi, "unaligned position"); return -EINVAL; }
if (*offp + count > vol->used_bytes) count_save = count = vol->used_bytes - *offp;
/* We can write only in fractions of the minimum I/O unit */ if (count & (ubi->min_io_size - 1)) { ubi_err(ubi, "unaligned write length"); return -EINVAL; }
tbuf_size = vol->usable_leb_size; if (count < tbuf_size) tbuf_size = ALIGN(count, ubi->min_io_size); tbuf = vmalloc(tbuf_size); if (!tbuf) return -ENOMEM;
len = count > tbuf_size ? tbuf_size : count;
while (count) { cond_resched();
if (off + len >= vol->usable_leb_size) len = vol->usable_leb_size - off;
err = copy_from_user(tbuf, buf, len); if (err) { err = -EFAULT; break; }
err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len); if (err) break;
off += len; if (off == vol->usable_leb_size) { lnum += 1; off -= vol->usable_leb_size; }
count -= len; *offp += len; buf += len; len = count > tbuf_size ? tbuf_size : count; }
vfree(tbuf); return err ? err : count_save - count;}
static ssize_t vol_cdev_write(struct file *file, const char __user *buf, size_t count, loff_t *offp){ int err = 0; struct ubi_volume_desc *desc = file->private_data; struct ubi_volume *vol = desc->vol; struct ubi_device *ubi = vol->ubi;
if (!vol->updating && !vol->changing_leb) return vol_cdev_direct_write(file, buf, count, offp);
if (vol->updating) err = ubi_more_update_data(ubi, vol, buf, count); else err = ubi_more_leb_change_data(ubi, vol, buf, count);
if (err < 0) { ubi_err(ubi, "cannot accept more %zd bytes of data, error %d", count, err); return err; }
if (err) { /* * The operation is finished, @err contains number of actually * written bytes. */ count = err;
if (vol->changing_leb) { revoke_exclusive(desc, UBI_READWRITE); return count; }
/* * We voluntarily do not take into account the skip_check flag * as we want to make sure what we wrote was correctly written. */ err = ubi_check_volume(ubi, vol->vol_id); if (err < 0) return err;
if (err) { ubi_warn(ubi, "volume %d on UBI device %d is corrupted", vol->vol_id, ubi->ubi_num); vol->corrupted = 1; } vol->checked = 1; ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED); revoke_exclusive(desc, UBI_READWRITE); }
return count;}
static long vol_cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg){ int err = 0; struct ubi_volume_desc *desc = file->private_data; struct ubi_volume *vol = desc->vol; struct ubi_device *ubi = vol->ubi; void __user *argp = (void __user *)arg;
switch (cmd) { /* Volume update command */ case UBI_IOCVOLUP: { int64_t bytes, rsvd_bytes;
if (!capable(CAP_SYS_RESOURCE)) { err = -EPERM; break; }
err = copy_from_user(&bytes, argp, sizeof(int64_t)); if (err) { err = -EFAULT; break; }
if (desc->mode == UBI_READONLY) { err = -EROFS; break; }
rsvd_bytes = (long long)vol->reserved_pebs * vol->usable_leb_size; if (bytes < 0 || bytes > rsvd_bytes) { err = -EINVAL; break; }
err = get_exclusive(desc); if (err < 0) break;
err = ubi_start_update(ubi, vol, bytes); if (bytes == 0) { ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED); revoke_exclusive(desc, UBI_READWRITE); } break; }
/* Atomic logical eraseblock change command */ case UBI_IOCEBCH: { struct ubi_leb_change_req req;
err = copy_from_user(&req, argp, sizeof(struct ubi_leb_change_req)); if (err) { err = -EFAULT; break; }
if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME) { err = -EROFS; break; }
/* Validate the request */ err = -EINVAL; if (!ubi_leb_valid(vol, req.lnum) || req.bytes < 0 || req.bytes > vol->usable_leb_size) break;
err = get_exclusive(desc); if (err < 0) break;
err = ubi_start_leb_change(ubi, vol, &req); if (req.bytes == 0) revoke_exclusive(desc, UBI_READWRITE); break; }
/* Logical eraseblock erasure command */ case UBI_IOCEBER: { int32_t lnum;
err = get_user(lnum, (__user int32_t *)argp); if (err) { err = -EFAULT; break; }
if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME) { err = -EROFS; break; }
if (!ubi_leb_valid(vol, lnum)) { err = -EINVAL; break; }
dbg_gen("erase LEB %d:%d", vol->vol_id, lnum); err = ubi_eba_unmap_leb(ubi, vol, lnum); if (err) break;
err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL); break; }
/* Logical eraseblock map command */ case UBI_IOCEBMAP: { struct ubi_map_req req;
err = copy_from_user(&req, argp, sizeof(struct ubi_map_req)); if (err) { err = -EFAULT; break; } err = ubi_leb_map(desc, req.lnum); break; }
/* Logical eraseblock un-map command */ case UBI_IOCEBUNMAP: { int32_t lnum;
err = get_user(lnum, (__user int32_t *)argp); if (err) { err = -EFAULT; break; } err = ubi_leb_unmap(desc, lnum); break; }
/* Check if logical eraseblock is mapped command */ case UBI_IOCEBISMAP: { int32_t lnum;
err = get_user(lnum, (__user int32_t *)argp); if (err) { err = -EFAULT; break; } err = ubi_is_mapped(desc, lnum); break; }
/* Set volume property command */ case UBI_IOCSETVOLPROP: { struct ubi_set_vol_prop_req req;
err = copy_from_user(&req, argp, sizeof(struct ubi_set_vol_prop_req)); if (err) { err = -EFAULT; break; } switch (req.property) { case UBI_VOL_PROP_DIRECT_WRITE: mutex_lock(&ubi->device_mutex); desc->vol->direct_writes = !!req.value; mutex_unlock(&ubi->device_mutex); break; default: err = -EINVAL; break; } break; }
/* Create a R/O block device on top of the UBI volume */ case UBI_IOCVOLCRBLK: { struct ubi_volume_info vi;
ubi_get_volume_info(desc, &vi); err = ubiblock_create(&vi); break; }
/* Remove the R/O block device */ case UBI_IOCVOLRMBLK: { struct ubi_volume_info vi;
ubi_get_volume_info(desc, &vi); err = ubiblock_remove(&vi); break; }
default: err = -ENOTTY; break; } return err;}
/** * verify_mkvol_req - verify volume creation request. * @ubi: UBI device description object * @req: the request to check * * This function zero if the request is correct, and %-EINVAL if not. */static int verify_mkvol_req(const struct ubi_device *ubi, const struct ubi_mkvol_req *req){ int n, err = -EINVAL;
if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 || req->name_len < 0) goto bad;
if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) && req->vol_id != UBI_VOL_NUM_AUTO) goto bad;
if (req->alignment == 0) goto bad;
if (req->bytes == 0) goto bad;
if (req->vol_type != UBI_DYNAMIC_VOLUME && req->vol_type != UBI_STATIC_VOLUME) goto bad;
if (req->flags & ~UBI_VOL_VALID_FLGS) goto bad;
if (req->flags & UBI_VOL_SKIP_CRC_CHECK_FLG && req->vol_type != UBI_STATIC_VOLUME) goto bad;
if (req->alignment > ubi->leb_size) goto bad;
n = req->alignment & (ubi->min_io_size - 1); if (req->alignment != 1 && n) goto bad;
if (!req->name[0] || !req->name_len) goto bad;
if (req->name_len > UBI_VOL_NAME_MAX) { err = -ENAMETOOLONG; goto bad; }
n = strnlen(req->name, req->name_len + 1); if (n != req->name_len) goto bad;
return 0;
bad: ubi_err(ubi, "bad volume creation request"); ubi_dump_mkvol_req(req); return err;}
/** * verify_rsvol_req - verify volume re-size request. * @ubi: UBI device description object * @req: the request to check * * This function returns zero if the request is correct, and %-EINVAL if not. */static int verify_rsvol_req(const struct ubi_device *ubi, const struct ubi_rsvol_req *req){ if (req->bytes <= 0) return -EINVAL;
if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) return -EINVAL;
return 0;}
/** * rename_volumes - rename UBI volumes. * @ubi: UBI device description object * @req: volumes re-name request * * This is a helper function for the volume re-name IOCTL which validates the * request, opens the volume and calls corresponding volumes management * function. Returns zero in case of success and a negative error code in case * of failure. */static int rename_volumes(struct ubi_device *ubi, struct ubi_rnvol_req *req){ int i, n, err; struct list_head rename_list; struct ubi_rename_entry *re, *re1;
if (req->count < 0 || req->count > UBI_MAX_RNVOL) return -EINVAL;
if (req->count == 0) return 0;
/* Validate volume IDs and names in the request */ for (i = 0; i < req->count; i++) { if (req->ents[i].vol_id < 0 || req->ents[i].vol_id >= ubi->vtbl_slots) return -EINVAL; if (req->ents[i].name_len < 0) return -EINVAL; if (req->ents[i].name_len > UBI_VOL_NAME_MAX) return -ENAMETOOLONG; req->ents[i].name[req->ents[i].name_len] = '\0'; n = strlen(req->ents[i].name); if (n != req->ents[i].name_len) return -EINVAL; }
/* Make sure volume IDs and names are unique */ for (i = 0; i < req->count - 1; i++) { for (n = i + 1; n < req->count; n++) { if (req->ents[i].vol_id == req->ents[n].vol_id) { ubi_err(ubi, "duplicated volume id %d", req->ents[i].vol_id); return -EINVAL; } if (!strcmp(req->ents[i].name, req->ents[n].name)) { ubi_err(ubi, "duplicated volume name \"%s\"", req->ents[i].name); return -EINVAL; } } }
/* Create the re-name list */ INIT_LIST_HEAD(&rename_list); for (i = 0; i < req->count; i++) { int vol_id = req->ents[i].vol_id; int name_len = req->ents[i].name_len; const char *name = req->ents[i].name;
re = kzalloc_obj(struct ubi_rename_entry); if (!re) { err = -ENOMEM; goto out_free; }
re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_METAONLY); if (IS_ERR(re->desc)) { err = PTR_ERR(re->desc); ubi_err(ubi, "cannot open volume %d, error %d", vol_id, err); kfree(re); goto out_free; }
/* Skip this re-naming if the name does not really change */ if (re->desc->vol->name_len == name_len && !memcmp(re->desc->vol->name, name, name_len)) { ubi_close_volume(re->desc); kfree(re); continue; }
re->new_name_len = name_len; memcpy(re->new_name, name, name_len); list_add_tail(&re->list, &rename_list); dbg_gen("will rename volume %d from \"%s\" to \"%s\"", vol_id, re->desc->vol->name, name); }
if (list_empty(&rename_list)) return 0;
/* Find out the volumes which have to be removed */ list_for_each_entry(re, &rename_list, list) { struct ubi_volume_desc *desc; int no_remove_needed = 0;
/* * Volume @re->vol_id is going to be re-named to * @re->new_name, while its current name is @name. If a volume * with name @re->new_name currently exists, it has to be * removed, unless it is also re-named in the request (@req). */ list_for_each_entry(re1, &rename_list, list) { if (re->new_name_len == re1->desc->vol->name_len && !memcmp(re->new_name, re1->desc->vol->name, re1->desc->vol->name_len)) { no_remove_needed = 1; break; } }
if (no_remove_needed) continue;
/* * It seems we need to remove volume with name @re->new_name, * if it exists. */ desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name, UBI_EXCLUSIVE); if (IS_ERR(desc)) { err = PTR_ERR(desc); if (err == -ENODEV) /* Re-naming into a non-existing volume name */ continue;
/* The volume exists but busy, or an error occurred */ ubi_err(ubi, "cannot open volume \"%s\", error %d", re->new_name, err); goto out_free; }
re1 = kzalloc_obj(struct ubi_rename_entry); if (!re1) { err = -ENOMEM; ubi_close_volume(desc); goto out_free; }
re1->remove = 1; re1->desc = desc; list_add(&re1->list, &rename_list); dbg_gen("will remove volume %d, name \"%s\"", re1->desc->vol->vol_id, re1->desc->vol->name); }
mutex_lock(&ubi->device_mutex); err = ubi_rename_volumes(ubi, &rename_list); mutex_unlock(&ubi->device_mutex);
out_free: list_for_each_entry_safe(re, re1, &rename_list, list) { ubi_close_volume(re->desc); list_del(&re->list); kfree(re); } return err;}
static int ubi_get_ec_info(struct ubi_device *ubi, struct ubi_ecinfo_req __user *ureq){ struct ubi_ecinfo_req req; struct ubi_wl_entry *wl; int read_cnt; int peb; int end_peb;
/* Copy the input arguments */ if (copy_from_user(&req, ureq, sizeof(struct ubi_ecinfo_req))) return -EFAULT;
/* Check input arguments */ if (req.length <= 0 || req.start < 0 || req.start >= ubi->peb_count) return -EINVAL;
if (check_add_overflow(req.start, req.length, &end_peb)) return -EINVAL;
if (end_peb > ubi->peb_count) end_peb = ubi->peb_count;
/* Check access rights before filling erase_counters array */ if (!access_ok((void __user *)ureq->erase_counters, (end_peb-req.start) * sizeof(int32_t))) return -EFAULT;
/* Fill erase counter array */ read_cnt = 0; for (peb = req.start; peb < end_peb; read_cnt++, peb++) { int ec;
if (ubi_io_is_bad(ubi, peb)) { if (put_user(UBI_UNKNOWN, ureq->erase_counters+read_cnt)) return -EFAULT;
continue; }
spin_lock(&ubi->wl_lock);
wl = ubi->lookuptbl[peb]; if (wl) ec = wl->ec; else ec = UBI_UNKNOWN;
spin_unlock(&ubi->wl_lock);
if (put_user(ec, ureq->erase_counters+read_cnt)) return -EFAULT;
}
/* Return actual read length */ req.read_length = read_cnt;
/* Copy everything except erase counter array */ if (copy_to_user(ureq, &req, sizeof(struct ubi_ecinfo_req))) return -EFAULT;
return 0;}
static long ubi_cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg){ int err = 0; struct ubi_device *ubi; struct ubi_volume_desc *desc; void __user *argp = (void __user *)arg;
if (!capable(CAP_SYS_RESOURCE)) return -EPERM;
ubi = ubi_get_by_major(imajor(file->f_mapping->host)); if (!ubi) return -ENODEV;
switch (cmd) { /* Create volume command */ case UBI_IOCMKVOL: { struct ubi_mkvol_req req;
dbg_gen("create volume"); err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req)); if (err) { err = -EFAULT; break; }
err = verify_mkvol_req(ubi, &req); if (err) break;
mutex_lock(&ubi->device_mutex); err = ubi_create_volume(ubi, &req); mutex_unlock(&ubi->device_mutex); if (err) break;
err = put_user(req.vol_id, (__user int32_t *)argp); if (err) err = -EFAULT;
break; }
/* Remove volume command */ case UBI_IOCRMVOL: { int vol_id;
dbg_gen("remove volume"); err = get_user(vol_id, (__user int32_t *)argp); if (err) { err = -EFAULT; break; }
desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); if (IS_ERR(desc)) { err = PTR_ERR(desc); break; }
mutex_lock(&ubi->device_mutex); err = ubi_remove_volume(desc, 0); mutex_unlock(&ubi->device_mutex);
/* * The volume is deleted (unless an error occurred), and the * 'struct ubi_volume' object will be freed when * 'ubi_close_volume()' will call 'put_device()'. */ ubi_close_volume(desc); break; }
/* Re-size volume command */ case UBI_IOCRSVOL: { int pebs; struct ubi_rsvol_req req;
dbg_gen("re-size volume"); err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req)); if (err) { err = -EFAULT; break; }
err = verify_rsvol_req(ubi, &req); if (err) break;
desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE); if (IS_ERR(desc)) { err = PTR_ERR(desc); break; }
pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1, desc->vol->usable_leb_size);
mutex_lock(&ubi->device_mutex); err = ubi_resize_volume(desc, pebs); mutex_unlock(&ubi->device_mutex); ubi_close_volume(desc); break; }
/* Re-name volumes command */ case UBI_IOCRNVOL: { struct ubi_rnvol_req *req;
dbg_gen("re-name volumes"); req = kmalloc_obj(struct ubi_rnvol_req); if (!req) { err = -ENOMEM; break; }
err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req)); if (err) { err = -EFAULT; kfree(req); break; }
err = rename_volumes(ubi, req); kfree(req); break; }
/* Check a specific PEB for bitflips and scrub it if needed */ case UBI_IOCRPEB: { int pnum;
err = get_user(pnum, (__user int32_t *)argp); if (err) { err = -EFAULT; break; }
err = ubi_bitflip_check(ubi, pnum, 0); break; }
/* Force scrubbing for a specific PEB */ case UBI_IOCSPEB: { int pnum;
err = get_user(pnum, (__user int32_t *)argp); if (err) { err = -EFAULT; break; }
err = ubi_bitflip_check(ubi, pnum, 1); break; }
case UBI_IOCECNFO: { err = ubi_get_ec_info(ubi, argp); break; }
default: err = -ENOTTY; break; }
ubi_put_device(ubi); return err;}
static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg){ int err = 0; void __user *argp = (void __user *)arg;
if (!capable(CAP_SYS_RESOURCE)) return -EPERM;
switch (cmd) { /* Attach an MTD device command */ case UBI_IOCATT: { struct ubi_attach_req req; struct mtd_info *mtd;
dbg_gen("attach MTD device"); err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req)); if (err) { err = -EFAULT; break; }
if (req.mtd_num < 0 || (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) { err = -EINVAL; break; }
mtd = get_mtd_device(NULL, req.mtd_num); if (IS_ERR(mtd)) { err = PTR_ERR(mtd); break; }
/* * Note, further request verification is done by * 'ubi_attach_mtd_dev()'. */ mutex_lock(&ubi_devices_mutex); err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset, req.max_beb_per1024, !!req.disable_fm, !!req.need_resv_pool, req.wl_threshold); mutex_unlock(&ubi_devices_mutex); if (err < 0) put_mtd_device(mtd); else /* @err contains UBI device number */ err = put_user(err, (__user int32_t *)argp);
break; }
/* Detach an MTD device command */ case UBI_IOCDET: { int ubi_num;
dbg_gen("detach MTD device"); err = get_user(ubi_num, (__user int32_t *)argp); if (err) { err = -EFAULT; break; }
mutex_lock(&ubi_devices_mutex); err = ubi_detach_mtd_dev(ubi_num, 0); mutex_unlock(&ubi_devices_mutex); break; }
default: err = -ENOTTY; break; }
return err;}
/* UBI volume character device operations */const struct file_operations ubi_vol_cdev_operations = { .owner = THIS_MODULE, .open = vol_cdev_open, .release = vol_cdev_release, .llseek = vol_cdev_llseek, .read = vol_cdev_read, .write = vol_cdev_write, .fsync = vol_cdev_fsync, .unlocked_ioctl = vol_cdev_ioctl, .compat_ioctl = compat_ptr_ioctl,};
/* UBI character device operations */const struct file_operations ubi_cdev_operations = { .owner = THIS_MODULE, .unlocked_ioctl = ubi_cdev_ioctl, .compat_ioctl = compat_ptr_ioctl,};
/* UBI control character device operations */const struct file_operations ubi_ctrl_cdev_operations = { .owner = THIS_MODULE, .unlocked_ioctl = ctrl_cdev_ioctl, .compat_ioctl = compat_ptr_ioctl,};