[PATCH 184/437] drivers/mtd: convert to ->read_iter and ->write_iter

From: Jens Axboe
Date: Thu Apr 11 2024 - 12:20:57 EST

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Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
---
drivers/mtd/mtdchar.c | 52 ++++++++++++++++++------------------
drivers/mtd/ubi/cdev.c | 58 ++++++++++++++++++++---------------------
drivers/mtd/ubi/debug.c | 38 ++++++++++++---------------
drivers/mtd/ubi/ubi.h | 4 +--
drivers/mtd/ubi/upd.c | 24 ++++++++---------
5 files changed, 83 insertions(+), 93 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 8dc4f5c493fc..0e3b6674f081 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -124,10 +124,10 @@ static int mtdchar_close(struct inode *inode, struct file *file)
* alignment requirements are not met in the NAND subdriver.
*/

-static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
- loff_t *ppos)
+static ssize_t mtdchar_read(struct kiocb *iocb, struct iov_iter *to)
{
- struct mtd_file_info *mfi = file->private_data;
+ struct mtd_file_info *mfi = iocb->ki_filp->private_data;
+ size_t count = iov_iter_count(to);
struct mtd_info *mtd = mfi->mtd;
size_t retlen;
size_t total_retlen=0;
@@ -138,9 +138,9 @@ static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,

pr_debug("MTD_read\n");

- if (*ppos + count > mtd->size) {
- if (*ppos < mtd->size)
- count = mtd->size - *ppos;
+ if (iocb->ki_pos + count > mtd->size) {
+ if (iocb->ki_pos < mtd->size)
+ count = mtd->size - iocb->ki_pos;
else
count = 0;
}
@@ -157,11 +157,11 @@ static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,

switch (mfi->mode) {
case MTD_FILE_MODE_OTP_FACTORY:
- ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
+ ret = mtd_read_fact_prot_reg(mtd, iocb->ki_pos, len,
&retlen, kbuf);
break;
case MTD_FILE_MODE_OTP_USER:
- ret = mtd_read_user_prot_reg(mtd, *ppos, len,
+ ret = mtd_read_user_prot_reg(mtd, iocb->ki_pos, len,
&retlen, kbuf);
break;
case MTD_FILE_MODE_RAW:
@@ -173,12 +173,12 @@ static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
ops.oobbuf = NULL;
ops.len = len;

- ret = mtd_read_oob(mtd, *ppos, &ops);
+ ret = mtd_read_oob(mtd, iocb->ki_pos, &ops);
retlen = ops.retlen;
break;
}
default:
- ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
+ ret = mtd_read(mtd, iocb->ki_pos, len, &retlen, kbuf);
}
/* Nand returns -EBADMSG on ECC errors, but it returns
* the data. For our userspace tools it is important
@@ -190,8 +190,8 @@ static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
* must be aware of the fact that it deals with NAND
*/
if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
- *ppos += retlen;
- if (copy_to_user(buf, kbuf, retlen)) {
+ iocb->ki_pos += retlen;
+ if (!copy_to_iter_full(kbuf, retlen, to)) {
kfree(kbuf);
return -EFAULT;
}
@@ -199,7 +199,6 @@ static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
total_retlen += retlen;

count -= retlen;
- buf += retlen;
if (retlen == 0)
count = 0;
}
@@ -214,10 +213,10 @@ static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
return total_retlen;
} /* mtdchar_read */

-static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
- loff_t *ppos)
+static ssize_t mtdchar_write(struct kiocb *iocb, struct iov_iter *from)
{
- struct mtd_file_info *mfi = file->private_data;
+ struct mtd_file_info *mfi = iocb->ki_filp->private_data;
+ size_t count = iov_iter_count(from);
struct mtd_info *mtd = mfi->mtd;
size_t size = count;
char *kbuf;
@@ -228,11 +227,11 @@ static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t c

pr_debug("MTD_write\n");

- if (*ppos >= mtd->size)
+ if (iocb->ki_pos >= mtd->size)
return -ENOSPC;

- if (*ppos + count > mtd->size)
- count = mtd->size - *ppos;
+ if (iocb->ki_pos + count > mtd->size)
+ count = mtd->size - iocb->ki_pos;

if (!count)
return 0;
@@ -244,7 +243,7 @@ static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t c
while (count) {
len = min_t(size_t, count, size);

- if (copy_from_user(kbuf, buf, len)) {
+ if (!copy_from_iter_full(kbuf, len, from)) {
kfree(kbuf);
return -EFAULT;
}
@@ -254,7 +253,7 @@ static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t c
ret = -EROFS;
break;
case MTD_FILE_MODE_OTP_USER:
- ret = mtd_write_user_prot_reg(mtd, *ppos, len,
+ ret = mtd_write_user_prot_reg(mtd, iocb->ki_pos, len,
&retlen, kbuf);
break;

@@ -268,13 +267,13 @@ static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t c
ops.ooboffs = 0;
ops.len = len;

- ret = mtd_write_oob(mtd, *ppos, &ops);
+ ret = mtd_write_oob(mtd, iocb->ki_pos, &ops);
retlen = ops.retlen;
break;
}

default:
- ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
+ ret = mtd_write(mtd, iocb->ki_pos, len, &retlen, kbuf);
}

/*
@@ -286,10 +285,9 @@ static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t c
break;

if (!ret) {
- *ppos += retlen;
+ iocb->ki_pos += retlen;
total_retlen += retlen;
count -= retlen;
- buf += retlen;
}
else {
kfree(kbuf);
@@ -1401,8 +1399,8 @@ static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
static const struct file_operations mtd_fops = {
.owner = THIS_MODULE,
.llseek = mtdchar_lseek,
- .read = mtdchar_read,
- .write = mtdchar_write,
+ .read_iter = mtdchar_read,
+ .write_iter = mtdchar_write,
.unlocked_ioctl = mtdchar_unlocked_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = mtdchar_compat_ioctl,
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 0d8f04cf03c5..ab99cfff211c 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -168,10 +168,10 @@ static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end,
}

-static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
- loff_t *offp)
+static ssize_t vol_cdev_read(struct kiocb *iocb, struct iov_iter *to)
{
- struct ubi_volume_desc *desc = file->private_data;
+ struct ubi_volume_desc *desc = iocb->ki_filp->private_data;
+ size_t count = iov_iter_count(to);
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
int err, lnum, off, len, tbuf_size;
@@ -179,7 +179,7 @@ static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
void *tbuf;

dbg_gen("read %zd bytes from offset %lld of volume %d",
- count, *offp, vol->vol_id);
+ count, iocb->ki_pos, vol->vol_id);

if (vol->updating) {
ubi_err(vol->ubi, "updating");
@@ -189,14 +189,14 @@ static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
ubi_err(vol->ubi, "damaged volume, update marker is set");
return -EBADF;
}
- if (*offp == vol->used_bytes || count == 0)
+ if (iocb->ki_pos == 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;
+ if (iocb->ki_pos + count > vol->used_bytes)
+ count_save = count = vol->used_bytes - iocb->ki_pos;

tbuf_size = vol->usable_leb_size;
if (count < tbuf_size)
@@ -206,7 +206,7 @@ static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
return -ENOMEM;

len = count > tbuf_size ? tbuf_size : count;
- lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);
+ lnum = div_u64_rem(iocb->ki_pos, vol->usable_leb_size, &off);

do {
cond_resched();
@@ -225,15 +225,14 @@ static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
}

count -= len;
- *offp += len;
+ iocb->ki_pos += len;

- err = copy_to_user(buf, tbuf, len);
+ err = !copy_to_iter_full(tbuf, len, to);
if (err) {
err = -EFAULT;
break;
}

- buf += len;
len = count > tbuf_size ? tbuf_size : count;
} while (count);

@@ -245,10 +244,10 @@ static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t 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)
+static ssize_t vol_cdev_direct_write(struct kiocb *iocb, struct iov_iter *from)
{
- struct ubi_volume_desc *desc = file->private_data;
+ struct ubi_volume_desc *desc = iocb->ki_filp->private_data;
+ size_t count = iov_iter_count(from);
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
int lnum, off, len, tbuf_size, err = 0;
@@ -259,19 +258,19 @@ static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
return -EPERM;

dbg_gen("requested: write %zd bytes to offset %lld of volume %u",
- count, *offp, vol->vol_id);
+ count, iocb->ki_pos, vol->vol_id);

if (vol->vol_type == UBI_STATIC_VOLUME)
return -EROFS;

- lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);
+ lnum = div_u64_rem(iocb->ki_pos, 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;
+ if (iocb->ki_pos + count > vol->used_bytes)
+ count_save = count = vol->used_bytes - iocb->ki_pos;

/* We can write only in fractions of the minimum I/O unit */
if (count & (ubi->min_io_size - 1)) {
@@ -294,7 +293,7 @@ static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
if (off + len >= vol->usable_leb_size)
len = vol->usable_leb_size - off;

- err = copy_from_user(tbuf, buf, len);
+ err = !copy_from_iter_full(tbuf, len, from);
if (err) {
err = -EFAULT;
break;
@@ -311,8 +310,7 @@ static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
}

count -= len;
- *offp += len;
- buf += len;
+ iocb->ki_pos += len;
len = count > tbuf_size ? tbuf_size : count;
}

@@ -320,25 +318,25 @@ static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
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)
+static ssize_t vol_cdev_write(struct kiocb *iocb, struct iov_iter *from)
{
int err = 0;
- struct ubi_volume_desc *desc = file->private_data;
+ struct ubi_volume_desc *desc = iocb->ki_filp->private_data;
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
+ size_t count = iov_iter_count(from);

if (!vol->updating && !vol->changing_leb)
- return vol_cdev_direct_write(file, buf, count, offp);
+ return vol_cdev_direct_write(iocb, from);

if (vol->updating)
- err = ubi_more_update_data(ubi, vol, buf, count);
+ err = ubi_more_update_data(ubi, vol, from);
else
- err = ubi_more_leb_change_data(ubi, vol, buf, count);
+ err = ubi_more_leb_change_data(ubi, vol, from);

if (err < 0) {
ubi_err(ubi, "cannot accept more %zd bytes of data, error %d",
- count, err);
+ iov_iter_count(from), err);
return err;
}

@@ -1085,8 +1083,8 @@ const struct file_operations ubi_vol_cdev_operations = {
.open = vol_cdev_open,
.release = vol_cdev_release,
.llseek = vol_cdev_llseek,
- .read = vol_cdev_read,
- .write = vol_cdev_write,
+ .read_iter = vol_cdev_read,
+ .write_iter = vol_cdev_write,
.fsync = vol_cdev_fsync,
.unlocked_ioctl = vol_cdev_ioctl,
.compat_ioctl = compat_ptr_ioctl,
diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c
index d57f52bd2ff3..2b364dd8e92e 100644
--- a/drivers/mtd/ubi/debug.c
+++ b/drivers/mtd/ubi/debug.c
@@ -325,11 +325,11 @@ void ubi_debugfs_exit(void)
}

/* Read an UBI debugfs file */
-static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
- size_t count, loff_t *ppos)
+static ssize_t dfs_file_read(struct kiocb *iocb, struct iov_iter *to)
{
- unsigned long ubi_num = (unsigned long)file->private_data;
- struct dentry *dent = file->f_path.dentry;
+ unsigned long ubi_num = (unsigned long)iocb->ki_filp->private_data;
+ struct dentry *dent = iocb->ki_filp->f_path.dentry;
+ size_t count = iov_iter_count(to);
struct ubi_device *ubi;
struct ubi_debug_info *d;
char buf[16];
@@ -354,23 +354,19 @@ static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
val = d->emulate_io_failures;
else if (dent == d->dfs_emulate_failures) {
snprintf(buf, sizeof(buf), "0x%04x\n", d->emulate_failures);
- count = simple_read_from_buffer(user_buf, count, ppos,
- buf, strlen(buf));
+ count = simple_copy_to_iter(buf, &iocb->ki_pos, strlen(buf), to);
goto out;
} else if (dent == d->dfs_emulate_power_cut) {
snprintf(buf, sizeof(buf), "%u\n", d->emulate_power_cut);
- count = simple_read_from_buffer(user_buf, count, ppos,
- buf, strlen(buf));
+ count = simple_copy_to_iter(buf, &iocb->ki_pos, strlen(buf), to);
goto out;
} else if (dent == d->dfs_power_cut_min) {
snprintf(buf, sizeof(buf), "%u\n", d->power_cut_min);
- count = simple_read_from_buffer(user_buf, count, ppos,
- buf, strlen(buf));
+ count = simple_copy_to_iter(buf, &iocb->ki_pos, strlen(buf), to);
goto out;
} else if (dent == d->dfs_power_cut_max) {
snprintf(buf, sizeof(buf), "%u\n", d->power_cut_max);
- count = simple_read_from_buffer(user_buf, count, ppos,
- buf, strlen(buf));
+ count = simple_copy_to_iter(buf, &iocb->ki_pos, strlen(buf), to);
goto out;
} else {
count = -EINVAL;
@@ -384,7 +380,7 @@ static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
buf[1] = '\n';
buf[2] = 0x00;

- count = simple_read_from_buffer(user_buf, count, ppos, buf, 2);
+ count = simple_copy_to_iter(buf, &iocb->ki_pos, 2, to);

out:
ubi_put_device(ubi);
@@ -392,11 +388,11 @@ static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
}

/* Write an UBI debugfs file */
-static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
- size_t count, loff_t *ppos)
+static ssize_t dfs_file_write(struct kiocb *iocb, struct iov_iter *from)
{
- unsigned long ubi_num = (unsigned long)file->private_data;
- struct dentry *dent = file->f_path.dentry;
+ unsigned long ubi_num = (unsigned long)iocb->ki_filp->private_data;
+ struct dentry *dent = iocb->ki_filp->f_path.dentry;
+ size_t count = iov_iter_count(from);
struct ubi_device *ubi;
struct ubi_debug_info *d;
size_t buf_size;
@@ -409,7 +405,7 @@ static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
d = &ubi->dbg;

buf_size = min_t(size_t, count, (sizeof(buf) - 1));
- if (copy_from_user(buf, user_buf, buf_size)) {
+ if (!copy_from_iter_full(buf, buf_size, from)) {
count = -EFAULT;
goto out;
}
@@ -467,8 +463,8 @@ static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
* detailed_erase_block_info
*/
static const struct file_operations dfs_fops = {
- .read = dfs_file_read,
- .write = dfs_file_write,
+ .read_iter = dfs_file_read,
+ .write_iter = dfs_file_write,
.open = simple_open,
.llseek = no_llseek,
.owner = THIS_MODULE,
@@ -576,7 +572,7 @@ static int eraseblk_count_release(struct inode *inode, struct file *f)
static const struct file_operations eraseblk_count_fops = {
.owner = THIS_MODULE,
.open = eraseblk_count_open,
- .read = seq_read,
+ .read_iter = seq_read_iter,
.llseek = seq_lseek,
.release = eraseblk_count_release,
};
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 32009a24869e..c932b1d31e6b 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -852,11 +852,11 @@ void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol);
int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol,
long long bytes);
int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
- const void __user *buf, int count);
+ struct iov_iter *from);
int ubi_start_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
const struct ubi_leb_change_req *req);
int ubi_more_leb_change_data(struct ubi_device *ubi, struct ubi_volume *vol,
- const void __user *buf, int count);
+ struct iov_iter *from);

/* misc.c */
int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf,
diff --git a/drivers/mtd/ubi/upd.c b/drivers/mtd/ubi/upd.c
index 962f693cf882..6fa6e5b67631 100644
--- a/drivers/mtd/ubi/upd.c
+++ b/drivers/mtd/ubi/upd.c
@@ -253,8 +253,7 @@ static int write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
* ubi_more_update_data - write more update data.
* @ubi: UBI device description object
* @vol: volume description object
- * @buf: write data (user-space memory buffer)
- * @count: how much bytes to write
+ * @from: write data (user-space memory buffer)
*
* This function writes more data to the volume which is being updated. It may
* be called arbitrary number of times until all the update data arriveis. This
@@ -263,11 +262,12 @@ static int write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
* negative error code in case of failure.
*/
int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
- const void __user *buf, int count)
+ struct iov_iter *from)
{
+ size_t count = iov_iter_count(from);
int lnum, offs, err = 0, len, to_write = count;

- dbg_gen("write %d of %lld bytes, %lld already passed",
+ dbg_gen("write %zd of %lld bytes, %lld already passed",
count, vol->upd_bytes, vol->upd_received);

if (ubi->ro_mode)
@@ -293,7 +293,7 @@ int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
if (len > count)
len = count;

- err = copy_from_user(vol->upd_buf + offs, buf, len);
+ err = !copy_from_iter_full(vol->upd_buf + offs, len, from);
if (err)
return -EFAULT;

@@ -314,7 +314,6 @@ int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,

vol->upd_received += len;
count -= len;
- buf += len;
lnum += 1;
}

@@ -328,7 +327,7 @@ int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
else
len = count;

- err = copy_from_user(vol->upd_buf, buf, len);
+ err = !copy_from_iter_full(vol->upd_buf, len, from);
if (err)
return -EFAULT;

@@ -343,7 +342,6 @@ int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
vol->upd_received += len;
count -= len;
lnum += 1;
- buf += len;
}

ubi_assert(vol->upd_received <= vol->upd_bytes);
@@ -367,8 +365,7 @@ int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
* ubi_more_leb_change_data - accept more data for atomic LEB change.
* @ubi: UBI device description object
* @vol: volume description object
- * @buf: write data (user-space memory buffer)
- * @count: how much bytes to write
+ * @from: write data (user-space memory buffer)
*
* This function accepts more data to the volume which is being under the
* "atomic LEB change" operation. It may be called arbitrary number of times
@@ -378,11 +375,12 @@ int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
* of failure.
*/
int ubi_more_leb_change_data(struct ubi_device *ubi, struct ubi_volume *vol,
- const void __user *buf, int count)
+ struct iov_iter *from)
{
+ size_t count = iov_iter_count(from);
int err;

- dbg_gen("write %d of %lld bytes, %lld already passed",
+ dbg_gen("write %zd of %lld bytes, %lld already passed",
count, vol->upd_bytes, vol->upd_received);

if (ubi->ro_mode)
@@ -391,7 +389,7 @@ int ubi_more_leb_change_data(struct ubi_device *ubi, struct ubi_volume *vol,
if (vol->upd_received + count > vol->upd_bytes)
count = vol->upd_bytes - vol->upd_received;

- err = copy_from_user(vol->upd_buf + vol->upd_received, buf, count);
+ err = !copy_from_iter_full(vol->upd_buf + vol->upd_received, count, from);
if (err)
return -EFAULT;

--
2.43.0

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