diff options
Diffstat (limited to 'drivers/mtd/mtdchar.c')
-rw-r--r-- | drivers/mtd/mtdchar.c | 111 |
1 files changed, 106 insertions, 5 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index 5ef45487b65f..3eff1e562ad3 100644 --- a/drivers/mtd/mtdchar.c +++ b/drivers/mtd/mtdchar.c @@ -30,8 +30,9 @@ #include <linux/backing-dev.h> #include <linux/compat.h> #include <linux/mount.h> - +#include <linux/blkpg.h> #include <linux/mtd/mtd.h> +#include <linux/mtd/partitions.h> #include <linux/mtd/map.h> #include <asm/uaccess.h> @@ -478,6 +479,78 @@ static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start, return ret; } +/* + * Copies (and truncates, if necessary) data from the larger struct, + * nand_ecclayout, to the smaller, deprecated layout struct, + * nand_ecclayout_user. This is necessary only to suppport the deprecated + * API ioctl ECCGETLAYOUT while allowing all new functionality to use + * nand_ecclayout flexibly (i.e. the struct may change size in new + * releases without requiring major rewrites). + */ +static int shrink_ecclayout(const struct nand_ecclayout *from, + struct nand_ecclayout_user *to) +{ + int i; + + if (!from || !to) + return -EINVAL; + + memset(to, 0, sizeof(*to)); + + to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES); + for (i = 0; i < to->eccbytes; i++) + to->eccpos[i] = from->eccpos[i]; + + for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { + if (from->oobfree[i].length == 0 && + from->oobfree[i].offset == 0) + break; + to->oobavail += from->oobfree[i].length; + to->oobfree[i] = from->oobfree[i]; + } + + return 0; +} + +#ifdef CONFIG_MTD_PARTITIONS +static int mtd_blkpg_ioctl(struct mtd_info *mtd, + struct blkpg_ioctl_arg __user *arg) +{ + struct blkpg_ioctl_arg a; + struct blkpg_partition p; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + /* Only master mtd device must be used to control partitions */ + if (!mtd_is_master(mtd)) + return -EINVAL; + + if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) + return -EFAULT; + + if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) + return -EFAULT; + + switch (a.op) { + case BLKPG_ADD_PARTITION: + + return mtd_add_partition(mtd, p.devname, p.start, p.length); + + case BLKPG_DEL_PARTITION: + + if (p.pno < 0) + return -EINVAL; + + return mtd_del_partition(mtd, p.pno); + + default: + return -EINVAL; + } +} +#endif + + static int mtd_ioctl(struct file *file, u_int cmd, u_long arg) { struct mtd_file_info *mfi = file->private_data; @@ -514,6 +587,9 @@ static int mtd_ioctl(struct file *file, u_int cmd, u_long arg) if (get_user(ur_idx, &(ur->regionindex))) return -EFAULT; + if (ur_idx >= mtd->numeraseregions) + return -EINVAL; + kr = &(mtd->eraseregions[ur_idx]); if (put_user(kr->offset, &(ur->offset)) @@ -813,14 +889,23 @@ static int mtd_ioctl(struct file *file, u_int cmd, u_long arg) } #endif + /* This ioctl is being deprecated - it truncates the ecc layout */ case ECCGETLAYOUT: { + struct nand_ecclayout_user *usrlay; + if (!mtd->ecclayout) return -EOPNOTSUPP; - if (copy_to_user(argp, mtd->ecclayout, - sizeof(struct nand_ecclayout))) - return -EFAULT; + usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); + if (!usrlay) + return -ENOMEM; + + shrink_ecclayout(mtd->ecclayout, usrlay); + + if (copy_to_user(argp, usrlay, sizeof(*usrlay))) + ret = -EFAULT; + kfree(usrlay); break; } @@ -856,6 +941,22 @@ static int mtd_ioctl(struct file *file, u_int cmd, u_long arg) break; } +#ifdef CONFIG_MTD_PARTITIONS + case BLKPG: + { + ret = mtd_blkpg_ioctl(mtd, + (struct blkpg_ioctl_arg __user *)arg); + break; + } + + case BLKRRPART: + { + /* No reread partition feature. Just return ok */ + ret = 0; + break; + } +#endif + default: ret = -ENOTTY; } @@ -1034,7 +1135,7 @@ static int mtd_inodefs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt) { - return get_sb_pseudo(fs_type, "mtd_inode:", NULL, MTD_INODE_FS_MAGIC, + return get_sb_pseudo(fs_type, "mtd_inode:", NULL, MTD_INODE_FS_MAGIC, mnt); } |