static int fsg_lun_open(struct fsg_lun *curlun, const char *filename) { int ro; struct file *filp = NULL; int rc = -EINVAL; struct inode *inode = NULL; loff_t size; loff_t num_sectors; loff_t min_sectors; unsigned int blkbits; unsigned int blksize; /* R/W if we can, R/O if we must */ ro = curlun->initially_ro; if (!ro) { filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0); if (PTR_ERR(filp) == -EROFS || PTR_ERR(filp) == -EACCES) ro = 1; } if (ro) filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0); if (IS_ERR(filp)) { LINFO(curlun, "unable to open backing file: %s\n", filename); return PTR_ERR(filp); } if (!(filp->f_mode & FMODE_WRITE)) ro = 1; inode = file_inode(filp); if ((!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))) { LINFO(curlun, "invalid file type: %s\n", filename); goto out; } /* * If we can't read the file, it's no good. * If we can't write the file, use it read-only. */ if (!(filp->f_op->read || filp->f_op->aio_read)) { LINFO(curlun, "file not readable: %s\n", filename); goto out; } if (!(filp->f_op->write || filp->f_op->aio_write)) ro = 1; size = i_size_read(inode->i_mapping->host); if (size < 0) { LINFO(curlun, "unable to find file size: %s\n", filename); rc = (int) size; goto out; } blksize = 512; blkbits = 9; num_sectors = size >> blkbits; /* File size in logic-block-size blocks */ min_sectors = 1; if (curlun->cdrom) { num_sectors &= ~3; /* Reduce to a multiple of 2048 */ min_sectors = 300*4; /* Smallest track is 300 frames */ if (num_sectors >= 256*60*75*4) { num_sectors = (256*60*75 - 1) * 4; LINFO(curlun, "file too big: %s\n", filename); LINFO(curlun, "using only first %d blocks\n", (int) num_sectors); } } if (num_sectors < min_sectors) { LINFO(curlun, "file too small: %s\n", filename); rc = -ETOOSMALL; goto out; } if (fsg_lun_is_open(curlun)) fsg_lun_close(curlun); curlun->blksize = blksize; curlun->blkbits = blkbits; curlun->ro = ro; curlun->filp = filp; curlun->file_length = size; curlun->num_sectors = num_sectors; LINFO(curlun, "open backing file: %s\n", filename); return 0; out: fput(filp); return rc; }
static int fsg_lun_open(struct fsg_lun *curlun, const char *filename) { int ro; struct file *filp = NULL; int rc = -EINVAL; struct inode *inode = NULL; loff_t size; loff_t num_sectors; loff_t min_sectors; unsigned int blkbits; unsigned int blksize; /* R/W if we can, R/O if we must */ ro = curlun->initially_ro; if (!ro) { filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0); if (PTR_ERR(filp) == -EROFS || PTR_ERR(filp) == -EACCES) ro = 1; } if (ro) filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0); if (IS_ERR(filp)) { LINFO(curlun, "unable to open backing file: %s\n", filename); return PTR_ERR(filp); } if (!(filp->f_mode & FMODE_WRITE)) ro = 1; inode = file_inode(filp); if ((!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))) { LINFO(curlun, "invalid file type: %s\n", filename); goto out; } /* * If we can't read the file, it's no good. * If we can't write the file, use it read-only. */ if (!(filp->f_op->read || filp->f_op->aio_read)) { LINFO(curlun, "file not readable: %s\n", filename); goto out; } if (!(filp->f_op->write || filp->f_op->aio_write)) ro = 1; size = i_size_read(inode->i_mapping->host); if (size < 0) { LINFO(curlun, "unable to find file size: %s\n", filename); rc = (int) size; goto out; } /* * curlun->blksize remains the old value when switch from cdrom to udisk * so use the same blksie in cdrom and udisk */ #ifdef CONFIG_HUAWEI_USB if (inode->i_bdev) { blksize = bdev_logical_block_size(inode->i_bdev); blkbits = blksize_bits(blksize); } else { blksize = 512; blkbits = 9; } #else if (curlun->cdrom) { blksize = 2048; blkbits = 11; } else if (inode->i_bdev) { blksize = bdev_logical_block_size(inode->i_bdev); blkbits = blksize_bits(blksize); } else { blksize = 512; blkbits = 9; } #endif num_sectors = size >> blkbits; /* File size in logic-block-size blocks */ min_sectors = 1; #ifndef CONFIG_HUAWEI_USB if (curlun->cdrom) { min_sectors = 300; /* Smallest track is 300 frames */ if (num_sectors >= 256*60*75) { num_sectors = 256*60*75 - 1; LINFO(curlun, "file too big: %s\n", filename); LINFO(curlun, "using only first %d blocks\n", (int) num_sectors); } } #endif if (num_sectors < min_sectors) { LINFO(curlun, "file too small: %s\n", filename); rc = -ETOOSMALL; goto out; } if (fsg_lun_is_open(curlun)) fsg_lun_close(curlun); curlun->blksize = blksize; curlun->blkbits = blkbits; curlun->ro = ro; curlun->filp = filp; curlun->file_length = size; curlun->num_sectors = num_sectors; LDBG(curlun, "open backing file: %s\n", filename); return 0; out: fput(filp); return rc; }
static int fsg_lun_open(struct fsg_lun *curlun, const char *filename) { int ro; struct file *filp = NULL; int rc = -EINVAL; struct inode *inode = NULL; struct backing_dev_info *bdi; loff_t size; loff_t num_sectors; loff_t min_sectors; unsigned int blkbits; unsigned int blksize; /* R/W if we can, R/O if we must */ ro = curlun->initially_ro; if (!ro) { filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0); if (PTR_ERR(filp) == -EROFS || PTR_ERR(filp) == -EACCES) ro = 1; } if (ro) filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0); if (IS_ERR(filp)) { LINFO(curlun, "unable to open backing file: %s\n", filename); return PTR_ERR(filp); } if (!(filp->f_mode & FMODE_WRITE)) ro = 1; inode = file_inode(filp); if ((!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))) { LINFO(curlun, "invalid file type: %s\n", filename); goto out; } /* * If we can't read the file, it's no good. * If we can't write the file, use it read-only. */ if (!(filp->f_op->read || filp->f_op->aio_read)) { LINFO(curlun, "file not readable: %s\n", filename); goto out; } if (!(filp->f_op->write || filp->f_op->aio_write)) ro = 1; size = i_size_read(inode->i_mapping->host); if (size < 0) { LINFO(curlun, "unable to find file size: %s\n", filename); rc = (int) size; goto out; } if (curlun->cdrom) { blksize = 2048; blkbits = 11; } else if (inode->i_bdev) { blksize = bdev_logical_block_size(inode->i_bdev); blkbits = blksize_bits(blksize); bdi = &inode->i_bdev->bd_queue->backing_dev_info; if (bdi->capabilities & BDI_CAP_STRICTLIMIT) { curlun->max_ratio = bdi->max_ratio; curlun->nofua = 1; if (bdi_set_max_ratio(bdi, uicc_ums_max_ratio)) pr_debug("%s, error in setting max_ratio\n", __func__); } } else { blksize = 512; blkbits = 9; } num_sectors = size >> blkbits; /* File size in logic-block-size blocks */ min_sectors = 1; if (curlun->cdrom) { min_sectors = 300; /* Smallest track is 300 frames */ if (num_sectors >= 256*60*75) { num_sectors = 256*60*75 - 1; LINFO(curlun, "file too big: %s\n", filename); LINFO(curlun, "using only first %d blocks\n", (int) num_sectors); } } if (num_sectors < min_sectors) { LINFO(curlun, "file too small: %s\n", filename); rc = -ETOOSMALL; goto out; } if (fsg_lun_is_open(curlun)) fsg_lun_close(curlun); curlun->blksize = blksize; curlun->blkbits = blkbits; curlun->ro = ro; curlun->filp = filp; curlun->file_length = size; curlun->num_sectors = num_sectors; LDBG(curlun, "open backing file: %s\n", filename); return 0; out: fput(filp); return rc; }