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path: root/drivers/mtd/ubi/cdev.c
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Diffstat (limited to 'drivers/mtd/ubi/cdev.c')
-rw-r--r--drivers/mtd/ubi/cdev.c234
1 files changed, 212 insertions, 22 deletions
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 89193ba9451e..03c759b4eeb5 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -39,9 +39,9 @@
#include <linux/stat.h>
#include <linux/ioctl.h>
#include <linux/capability.h>
+#include <linux/uaccess.h>
#include <linux/smp_lock.h>
#include <mtd/ubi-user.h>
-#include <asm/uaccess.h>
#include <asm/div64.h>
#include "ubi.h"
@@ -116,7 +116,7 @@ static int vol_cdev_open(struct inode *inode, struct file *file)
else
mode = UBI_READONLY;
- dbg_msg("open volume %d, mode %d", vol_id, mode);
+ dbg_gen("open volume %d, mode %d", vol_id, mode);
desc = ubi_open_volume(ubi_num, vol_id, mode);
unlock_kernel();
@@ -132,7 +132,7 @@ 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_msg("release volume %d, mode %d", vol->vol_id, desc->mode);
+ dbg_gen("release volume %d, mode %d", vol->vol_id, desc->mode);
if (vol->updating) {
ubi_warn("update of volume %d not finished, volume is damaged",
@@ -141,7 +141,7 @@ static int vol_cdev_release(struct inode *inode, struct file *file)
vol->updating = 0;
vfree(vol->upd_buf);
} else if (vol->changing_leb) {
- dbg_msg("only %lld of %lld bytes received for atomic LEB change"
+ 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;
@@ -183,7 +183,7 @@ static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin)
return -EINVAL;
}
- dbg_msg("seek volume %d, offset %lld, origin %d, new offset %lld",
+ dbg_gen("seek volume %d, offset %lld, origin %d, new offset %lld",
vol->vol_id, offset, origin, new_offset);
file->f_pos = new_offset;
@@ -201,7 +201,7 @@ static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
void *tbuf;
uint64_t tmp;
- dbg_msg("read %zd bytes from offset %lld of volume %d",
+ dbg_gen("read %zd bytes from offset %lld of volume %d",
count, *offp, vol->vol_id);
if (vol->updating) {
@@ -216,7 +216,7 @@ static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
return 0;
if (vol->corrupted)
- dbg_msg("read from corrupted volume %d", vol->vol_id);
+ dbg_gen("read from corrupted volume %d", vol->vol_id);
if (*offp + count > vol->used_bytes)
count_save = count = vol->used_bytes - *offp;
@@ -285,7 +285,7 @@ static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
char *tbuf;
uint64_t tmp;
- dbg_msg("requested: write %zd bytes to offset %lld of volume %u",
+ dbg_gen("requested: write %zd bytes to offset %lld of volume %u",
count, *offp, vol->vol_id);
if (vol->vol_type == UBI_STATIC_VOLUME)
@@ -295,7 +295,7 @@ static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
off = do_div(tmp, vol->usable_leb_size);
lnum = tmp;
- if (off % ubi->min_io_size) {
+ if (off & (ubi->min_io_size - 1)) {
dbg_err("unaligned position");
return -EINVAL;
}
@@ -304,7 +304,7 @@ static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
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) {
+ if (count & (ubi->min_io_size - 1)) {
dbg_err("unaligned write length");
return -EINVAL;
}
@@ -352,7 +352,7 @@ static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
}
#else
-#define vol_cdev_direct_write(file, buf, count, offp) -EPERM
+#define vol_cdev_direct_write(file, buf, count, offp) (-EPERM)
#endif /* CONFIG_MTD_UBI_DEBUG_USERSPACE_IO */
static ssize_t vol_cdev_write(struct file *file, const char __user *buf,
@@ -437,7 +437,8 @@ static int vol_cdev_ioctl(struct inode *inode, struct file *file,
break;
}
- rsvd_bytes = vol->reserved_pebs * (ubi->leb_size-vol->data_pad);
+ rsvd_bytes = (long long)vol->reserved_pebs *
+ ubi->leb_size-vol->data_pad;
if (bytes < 0 || bytes > rsvd_bytes) {
err = -EINVAL;
break;
@@ -513,7 +514,7 @@ static int vol_cdev_ioctl(struct inode *inode, struct file *file,
break;
}
- dbg_msg("erase LEB %d:%d", vol->vol_id, lnum);
+ dbg_gen("erase LEB %d:%d", vol->vol_id, lnum);
err = ubi_eba_unmap_leb(ubi, vol, lnum);
if (err)
break;
@@ -564,7 +565,7 @@ static int verify_mkvol_req(const struct ubi_device *ubi,
if (req->alignment > ubi->leb_size)
goto bad;
- n = req->alignment % ubi->min_io_size;
+ n = req->alignment & (ubi->min_io_size - 1);
if (req->alignment != 1 && n)
goto bad;
@@ -573,6 +574,10 @@ static int verify_mkvol_req(const struct ubi_device *ubi,
goto bad;
}
+ n = strnlen(req->name, req->name_len + 1);
+ if (n != req->name_len)
+ goto bad;
+
return 0;
bad:
@@ -600,6 +605,166 @@ static int verify_rsvol_req(const struct ubi_device *ubi,
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
+ * 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)
+ err = -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) {
+ dbg_err("duplicated volume id %d",
+ req->ents[i].vol_id);
+ return -EINVAL;
+ }
+ if (!strcmp(req->ents[i].name, req->ents[n].name)) {
+ dbg_err("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(sizeof(struct ubi_rename_entry), GFP_KERNEL);
+ if (!re) {
+ err = -ENOMEM;
+ goto out_free;
+ }
+
+ re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE);
+ if (IS_ERR(re->desc)) {
+ err = PTR_ERR(re->desc);
+ dbg_err("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_msg("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 */
+ dbg_err("cannot open volume \"%s\", error %d",
+ re->new_name, err);
+ goto out_free;
+ }
+
+ re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);
+ if (!re) {
+ err = -ENOMEM;
+ ubi_close_volume(desc);
+ goto out_free;
+ }
+
+ re->remove = 1;
+ re->desc = desc;
+ list_add(&re->list, &rename_list);
+ dbg_msg("will remove volume %d, name \"%s\"",
+ re->desc->vol->vol_id, re->desc->vol->name);
+ }
+
+ mutex_lock(&ubi->volumes_mutex);
+ err = ubi_rename_volumes(ubi, &rename_list);
+ mutex_unlock(&ubi->volumes_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_cdev_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
@@ -621,19 +786,18 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
{
struct ubi_mkvol_req req;
- dbg_msg("create volume");
+ dbg_gen("create volume");
err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req));
if (err) {
err = -EFAULT;
break;
}
+ req.name[req.name_len] = '\0';
err = verify_mkvol_req(ubi, &req);
if (err)
break;
- req.name[req.name_len] = '\0';
-
mutex_lock(&ubi->volumes_mutex);
err = ubi_create_volume(ubi, &req);
mutex_unlock(&ubi->volumes_mutex);
@@ -652,7 +816,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
{
int vol_id;
- dbg_msg("remove volume");
+ dbg_gen("remove volume");
err = get_user(vol_id, (__user int32_t *)argp);
if (err) {
err = -EFAULT;
@@ -666,7 +830,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
}
mutex_lock(&ubi->volumes_mutex);
- err = ubi_remove_volume(desc);
+ err = ubi_remove_volume(desc, 0);
mutex_unlock(&ubi->volumes_mutex);
/*
@@ -685,7 +849,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
uint64_t tmp;
struct ubi_rsvol_req req;
- dbg_msg("re-size volume");
+ dbg_gen("re-size volume");
err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req));
if (err) {
err = -EFAULT;
@@ -713,6 +877,32 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
break;
}
+ /* Re-name volumes command */
+ case UBI_IOCRNVOL:
+ {
+ struct ubi_rnvol_req *req;
+
+ dbg_msg("re-name volumes");
+ req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL);
+ if (!req) {
+ err = -ENOMEM;
+ break;
+ };
+
+ err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req));
+ if (err) {
+ err = -EFAULT;
+ kfree(req);
+ break;
+ }
+
+ mutex_lock(&ubi->mult_mutex);
+ err = rename_volumes(ubi, req);
+ mutex_unlock(&ubi->mult_mutex);
+ kfree(req);
+ break;
+ }
+
default:
err = -ENOTTY;
break;
@@ -738,7 +928,7 @@ static int ctrl_cdev_ioctl(struct inode *inode, struct file *file,
struct ubi_attach_req req;
struct mtd_info *mtd;
- dbg_msg("attach MTD device");
+ dbg_gen("attach MTD device");
err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req));
if (err) {
err = -EFAULT;
@@ -778,7 +968,7 @@ static int ctrl_cdev_ioctl(struct inode *inode, struct file *file,
{
int ubi_num;
- dbg_msg("dettach MTD device");
+ dbg_gen("dettach MTD device");
err = get_user(ubi_num, (__user int32_t *)argp);
if (err) {
err = -EFAULT;