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Diffstat (limited to 'drivers/mtd/mtdconcat.c')
-rw-r--r--drivers/mtd/mtdconcat.c251
1 files changed, 129 insertions, 122 deletions
diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index d563dcd4b26..b9000563b9f 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -1,13 +1,25 @@
/*
* MTD device concatenation layer
*
- * (C) 2002 Robert Kaiser <rkaiser@sysgo.de>
+ * Copyright © 2002 Robert Kaiser <rkaiser@sysgo.de>
+ * Copyright © 2002-2010 David Woodhouse <dwmw2@infradead.org>
*
* NAND support by Christian Gan <cgan@iders.ca>
*
- * This code is GPL
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
- * $Id: mtdconcat.c,v 1.11 2005/11/07 11:14:20 gleixner Exp $
*/
#include <linux/kernel.h>
@@ -15,6 +27,7 @@
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/types.h>
+#include <linux/backing-dev.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/concat.h>
@@ -59,8 +72,6 @@ concat_read(struct mtd_info *mtd, loff_t from, size_t len,
int ret = 0, err;
int i;
- *retlen = 0;
-
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
size_t size, retsize;
@@ -78,14 +89,14 @@ concat_read(struct mtd_info *mtd, loff_t from, size_t len,
/* Entire transaction goes into this subdev */
size = len;
- err = subdev->read(subdev, from, size, &retsize, buf);
+ err = mtd_read(subdev, from, size, &retsize, buf);
/* Save information about bitflips! */
if (unlikely(err)) {
- if (err == -EBADMSG) {
+ if (mtd_is_eccerr(err)) {
mtd->ecc_stats.failed++;
ret = err;
- } else if (err == -EUCLEAN) {
+ } else if (mtd_is_bitflip(err)) {
mtd->ecc_stats.corrected++;
/* Do not overwrite -EBADMSG !! */
if (!ret)
@@ -113,11 +124,6 @@ concat_write(struct mtd_info *mtd, loff_t to, size_t len,
int err = -EINVAL;
int i;
- if (!(mtd->flags & MTD_WRITEABLE))
- return -EROFS;
-
- *retlen = 0;
-
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
size_t size, retsize;
@@ -132,11 +138,7 @@ concat_write(struct mtd_info *mtd, loff_t to, size_t len,
else
size = len;
- if (!(subdev->flags & MTD_WRITEABLE))
- err = -EROFS;
- else
- err = subdev->write(subdev, to, size, &retsize, buf);
-
+ err = mtd_write(subdev, to, size, &retsize, buf);
if (err)
break;
@@ -163,19 +165,10 @@ concat_writev(struct mtd_info *mtd, const struct kvec *vecs,
int i;
int err = -EINVAL;
- if (!(mtd->flags & MTD_WRITEABLE))
- return -EROFS;
-
- *retlen = 0;
-
/* Calculate total length of data */
for (i = 0; i < count; i++)
total_len += vecs[i].iov_len;
- /* Do not allow write past end of device */
- if ((to + total_len) > mtd->size)
- return -EINVAL;
-
/* Check alignment */
if (mtd->writesize > 1) {
uint64_t __to = to;
@@ -184,10 +177,9 @@ concat_writev(struct mtd_info *mtd, const struct kvec *vecs,
}
/* make a copy of vecs */
- vecs_copy = kmalloc(sizeof(struct kvec) * count, GFP_KERNEL);
+ vecs_copy = kmemdup(vecs, sizeof(struct kvec) * count, GFP_KERNEL);
if (!vecs_copy)
return -ENOMEM;
- memcpy(vecs_copy, vecs, sizeof(struct kvec) * count);
entry_low = 0;
for (i = 0; i < concat->num_subdev; i++) {
@@ -199,7 +191,7 @@ concat_writev(struct mtd_info *mtd, const struct kvec *vecs,
continue;
}
- size = min(total_len, (size_t)(subdev->size - to));
+ size = min_t(uint64_t, total_len, subdev->size - to);
wsize = size; /* store for future use */
entry_high = entry_low;
@@ -212,11 +204,8 @@ concat_writev(struct mtd_info *mtd, const struct kvec *vecs,
old_iov_len = vecs_copy[entry_high].iov_len;
vecs_copy[entry_high].iov_len = size;
- if (!(subdev->flags & MTD_WRITEABLE))
- err = -EROFS;
- else
- err = subdev->writev(subdev, &vecs_copy[entry_low],
- entry_high - entry_low + 1, to, &retsize);
+ err = mtd_writev(subdev, &vecs_copy[entry_low],
+ entry_high - entry_low + 1, to, &retsize);
vecs_copy[entry_high].iov_len = old_iov_len - size;
vecs_copy[entry_high].iov_base += size;
@@ -261,16 +250,16 @@ concat_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
if (from + devops.len > subdev->size)
devops.len = subdev->size - from;
- err = subdev->read_oob(subdev, from, &devops);
+ err = mtd_read_oob(subdev, from, &devops);
ops->retlen += devops.retlen;
ops->oobretlen += devops.oobretlen;
/* Save information about bitflips! */
if (unlikely(err)) {
- if (err == -EBADMSG) {
+ if (mtd_is_eccerr(err)) {
mtd->ecc_stats.failed++;
ret = err;
- } else if (err == -EUCLEAN) {
+ } else if (mtd_is_bitflip(err)) {
mtd->ecc_stats.corrected++;
/* Do not overwrite -EBADMSG !! */
if (!ret)
@@ -307,7 +296,7 @@ concat_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops)
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
- ops->retlen = 0;
+ ops->retlen = ops->oobretlen = 0;
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
@@ -321,8 +310,8 @@ concat_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops)
if (to + devops.len > subdev->size)
devops.len = subdev->size - to;
- err = subdev->write_oob(subdev, to, &devops);
- ops->retlen += devops.retlen;
+ err = mtd_write_oob(subdev, to, &devops);
+ ops->retlen += devops.oobretlen;
if (err)
return err;
@@ -367,7 +356,7 @@ static int concat_dev_erase(struct mtd_info *mtd, struct erase_info *erase)
* FIXME: Allow INTERRUPTIBLE. Which means
* not having the wait_queue head on the stack.
*/
- err = mtd->erase(mtd, erase);
+ err = mtd_erase(mtd, erase);
if (!err) {
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&waitq, &wait);
@@ -387,18 +376,9 @@ static int concat_erase(struct mtd_info *mtd, struct erase_info *instr)
struct mtd_concat *concat = CONCAT(mtd);
struct mtd_info *subdev;
int i, err;
- u_int32_t length, offset = 0;
+ uint64_t length, offset = 0;
struct erase_info *erase;
- if (!(mtd->flags & MTD_WRITEABLE))
- return -EROFS;
-
- if (instr->addr > concat->mtd.size)
- return -EINVAL;
-
- if (instr->len + instr->addr > concat->mtd.size)
- return -EINVAL;
-
/*
* Check for proper erase block alignment of the to-be-erased area.
* It is easier to do this based on the super device's erase
@@ -428,7 +408,7 @@ static int concat_erase(struct mtd_info *mtd, struct erase_info *instr)
* to-be-erased area begins. Verify that the starting
* offset is aligned to this region's erase size:
*/
- if (instr->addr & (erase_regions[i].erasesize - 1))
+ if (i < 0 || instr->addr & (erase_regions[i].erasesize - 1))
return -EINVAL;
/*
@@ -441,13 +421,11 @@ static int concat_erase(struct mtd_info *mtd, struct erase_info *instr)
/*
* check if the ending offset is aligned to this region's erase size
*/
- if ((instr->addr + instr->len) & (erase_regions[i].erasesize -
- 1))
+ if (i < 0 || ((instr->addr + instr->len) &
+ (erase_regions[i].erasesize - 1)))
return -EINVAL;
}
- instr->fail_addr = 0xffffffff;
-
/* make a local copy of instr to avoid modifying the caller's struct */
erase = kmalloc(sizeof (struct erase_info), GFP_KERNEL);
@@ -486,16 +464,12 @@ static int concat_erase(struct mtd_info *mtd, struct erase_info *instr)
else
erase->len = length;
- if (!(subdev->flags & MTD_WRITEABLE)) {
- err = -EROFS;
- break;
- }
length -= erase->len;
if ((err = concat_dev_erase(subdev, erase))) {
/* sanity check: should never happen since
* block alignment has been checked above */
BUG_ON(err == -EINVAL);
- if (erase->fail_addr != 0xffffffff)
+ if (erase->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
instr->fail_addr = erase->fail_addr + offset;
break;
}
@@ -520,17 +494,14 @@ static int concat_erase(struct mtd_info *mtd, struct erase_info *instr)
return 0;
}
-static int concat_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
+static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_concat *concat = CONCAT(mtd);
int i, err = -EINVAL;
- if ((len + ofs) > mtd->size)
- return -EINVAL;
-
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
- size_t size;
+ uint64_t size;
if (ofs >= subdev->size) {
size = 0;
@@ -542,8 +513,7 @@ static int concat_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
else
size = len;
- err = subdev->lock(subdev, ofs, size);
-
+ err = mtd_lock(subdev, ofs, size);
if (err)
break;
@@ -558,17 +528,14 @@ static int concat_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
return err;
}
-static int concat_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
+static int concat_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_concat *concat = CONCAT(mtd);
int i, err = 0;
- if ((len + ofs) > mtd->size)
- return -EINVAL;
-
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
- size_t size;
+ uint64_t size;
if (ofs >= subdev->size) {
size = 0;
@@ -580,8 +547,7 @@ static int concat_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
else
size = len;
- err = subdev->unlock(subdev, ofs, size);
-
+ err = mtd_unlock(subdev, ofs, size);
if (err)
break;
@@ -603,7 +569,7 @@ static void concat_sync(struct mtd_info *mtd)
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
- subdev->sync(subdev);
+ mtd_sync(subdev);
}
}
@@ -614,7 +580,7 @@ static int concat_suspend(struct mtd_info *mtd)
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
- if ((rc = subdev->suspend(subdev)) < 0)
+ if ((rc = mtd_suspend(subdev)) < 0)
return rc;
}
return rc;
@@ -627,7 +593,7 @@ static void concat_resume(struct mtd_info *mtd)
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
- subdev->resume(subdev);
+ mtd_resume(subdev);
}
}
@@ -636,12 +602,9 @@ static int concat_block_isbad(struct mtd_info *mtd, loff_t ofs)
struct mtd_concat *concat = CONCAT(mtd);
int i, res = 0;
- if (!concat->subdev[0]->block_isbad)
+ if (!mtd_can_have_bb(concat->subdev[0]))
return res;
- if (ofs > mtd->size)
- return -EINVAL;
-
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
@@ -650,7 +613,7 @@ static int concat_block_isbad(struct mtd_info *mtd, loff_t ofs)
continue;
}
- res = subdev->block_isbad(subdev, ofs);
+ res = mtd_block_isbad(subdev, ofs);
break;
}
@@ -662,12 +625,6 @@ static int concat_block_markbad(struct mtd_info *mtd, loff_t ofs)
struct mtd_concat *concat = CONCAT(mtd);
int i, err = -EINVAL;
- if (!concat->subdev[0]->block_markbad)
- return 0;
-
- if (ofs > mtd->size)
- return -EINVAL;
-
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
@@ -676,7 +633,7 @@ static int concat_block_markbad(struct mtd_info *mtd, loff_t ofs)
continue;
}
- err = subdev->block_markbad(subdev, ofs);
+ err = mtd_block_markbad(subdev, ofs);
if (!err)
mtd->ecc_stats.badblocks++;
break;
@@ -686,6 +643,32 @@ static int concat_block_markbad(struct mtd_info *mtd, loff_t ofs)
}
/*
+ * try to support NOMMU mmaps on concatenated devices
+ * - we don't support subdev spanning as we can't guarantee it'll work
+ */
+static unsigned long concat_get_unmapped_area(struct mtd_info *mtd,
+ unsigned long len,
+ unsigned long offset,
+ unsigned long flags)
+{
+ struct mtd_concat *concat = CONCAT(mtd);
+ int i;
+
+ for (i = 0; i < concat->num_subdev; i++) {
+ struct mtd_info *subdev = concat->subdev[i];
+
+ if (offset >= subdev->size) {
+ offset -= subdev->size;
+ continue;
+ }
+
+ return mtd_get_unmapped_area(subdev, len, offset, flags);
+ }
+
+ return (unsigned long) -ENOSYS;
+}
+
+/*
* This function constructs a virtual MTD device by concatenating
* num_devs MTD devices. A pointer to the new device object is
* stored to *new_dev upon success. This function does _not_
@@ -693,13 +676,14 @@ static int concat_block_markbad(struct mtd_info *mtd, loff_t ofs)
*/
struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to concatenate */
int num_devs, /* number of subdevices */
- char *name)
+ const char *name)
{ /* name for the new device */
int i;
size_t size;
struct mtd_concat *concat;
- u_int32_t max_erasesize, curr_erasesize;
+ uint32_t max_erasesize, curr_erasesize;
int num_erase_region;
+ int max_writebufsize = 0;
printk(KERN_NOTICE "Concatenating MTD devices:\n");
for (i = 0; i < num_devs; i++)
@@ -719,29 +703,37 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to c
/*
* Set up the new "super" device's MTD object structure, check for
- * incompatibilites between the subdevices.
+ * incompatibilities between the subdevices.
*/
concat->mtd.type = subdev[0]->type;
concat->mtd.flags = subdev[0]->flags;
concat->mtd.size = subdev[0]->size;
concat->mtd.erasesize = subdev[0]->erasesize;
concat->mtd.writesize = subdev[0]->writesize;
+
+ for (i = 0; i < num_devs; i++)
+ if (max_writebufsize < subdev[i]->writebufsize)
+ max_writebufsize = subdev[i]->writebufsize;
+ concat->mtd.writebufsize = max_writebufsize;
+
concat->mtd.subpage_sft = subdev[0]->subpage_sft;
concat->mtd.oobsize = subdev[0]->oobsize;
concat->mtd.oobavail = subdev[0]->oobavail;
- if (subdev[0]->writev)
- concat->mtd.writev = concat_writev;
- if (subdev[0]->read_oob)
- concat->mtd.read_oob = concat_read_oob;
- if (subdev[0]->write_oob)
- concat->mtd.write_oob = concat_write_oob;
- if (subdev[0]->block_isbad)
- concat->mtd.block_isbad = concat_block_isbad;
- if (subdev[0]->block_markbad)
- concat->mtd.block_markbad = concat_block_markbad;
+ if (subdev[0]->_writev)
+ concat->mtd._writev = concat_writev;
+ if (subdev[0]->_read_oob)
+ concat->mtd._read_oob = concat_read_oob;
+ if (subdev[0]->_write_oob)
+ concat->mtd._write_oob = concat_write_oob;
+ if (subdev[0]->_block_isbad)
+ concat->mtd._block_isbad = concat_block_isbad;
+ if (subdev[0]->_block_markbad)
+ concat->mtd._block_markbad = concat_block_markbad;
concat->mtd.ecc_stats.badblocks = subdev[0]->ecc_stats.badblocks;
+ concat->mtd.backing_dev_info = subdev[0]->backing_dev_info;
+
concat->subdev[0] = subdev[0];
for (i = 1; i < num_devs; i++) {
@@ -768,14 +760,23 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to c
concat->mtd.flags |=
subdev[i]->flags & MTD_WRITEABLE;
}
+
+ /* only permit direct mapping if the BDIs are all the same
+ * - copy-mapping is still permitted
+ */
+ if (concat->mtd.backing_dev_info !=
+ subdev[i]->backing_dev_info)
+ concat->mtd.backing_dev_info =
+ &default_backing_dev_info;
+
concat->mtd.size += subdev[i]->size;
concat->mtd.ecc_stats.badblocks +=
subdev[i]->ecc_stats.badblocks;
if (concat->mtd.writesize != subdev[i]->writesize ||
concat->mtd.subpage_sft != subdev[i]->subpage_sft ||
concat->mtd.oobsize != subdev[i]->oobsize ||
- !concat->mtd.read_oob != !subdev[i]->read_oob ||
- !concat->mtd.write_oob != !subdev[i]->write_oob) {
+ !concat->mtd._read_oob != !subdev[i]->_read_oob ||
+ !concat->mtd._write_oob != !subdev[i]->_write_oob) {
kfree(concat);
printk("Incompatible OOB or ECC data on \"%s\"\n",
subdev[i]->name);
@@ -790,14 +791,15 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to c
concat->num_subdev = num_devs;
concat->mtd.name = name;
- concat->mtd.erase = concat_erase;
- concat->mtd.read = concat_read;
- concat->mtd.write = concat_write;
- concat->mtd.sync = concat_sync;
- concat->mtd.lock = concat_lock;
- concat->mtd.unlock = concat_unlock;
- concat->mtd.suspend = concat_suspend;
- concat->mtd.resume = concat_resume;
+ concat->mtd._erase = concat_erase;
+ concat->mtd._read = concat_read;
+ concat->mtd._write = concat_write;
+ concat->mtd._sync = concat_sync;
+ concat->mtd._lock = concat_lock;
+ concat->mtd._unlock = concat_unlock;
+ concat->mtd._suspend = concat_suspend;
+ concat->mtd._resume = concat_resume;
+ concat->mtd._get_unmapped_area = concat_get_unmapped_area;
/*
* Combine the erase block size info of the subdevices:
@@ -844,12 +846,14 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to c
concat->mtd.erasesize = curr_erasesize;
concat->mtd.numeraseregions = 0;
} else {
+ uint64_t tmp64;
+
/*
* erase block size varies across the subdevices: allocate
* space to store the data describing the variable erase regions
*/
struct mtd_erase_region_info *erase_region_p;
- u_int32_t begin, position;
+ uint64_t begin, position;
concat->mtd.erasesize = max_erasesize;
concat->mtd.numeraseregions = num_erase_region;
@@ -881,8 +885,9 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to c
erase_region_p->offset = begin;
erase_region_p->erasesize =
curr_erasesize;
- erase_region_p->numblocks =
- (position - begin) / curr_erasesize;
+ tmp64 = position - begin;
+ do_div(tmp64, curr_erasesize);
+ erase_region_p->numblocks = tmp64;
begin = position;
curr_erasesize = subdev[i]->erasesize;
@@ -899,9 +904,9 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to c
erase_region_p->offset = begin;
erase_region_p->erasesize =
curr_erasesize;
- erase_region_p->numblocks =
- (position -
- begin) / curr_erasesize;
+ tmp64 = position - begin;
+ do_div(tmp64, curr_erasesize);
+ erase_region_p->numblocks = tmp64;
begin = position;
curr_erasesize =
@@ -911,14 +916,16 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to c
}
position +=
subdev[i]->eraseregions[j].
- numblocks * curr_erasesize;
+ numblocks * (uint64_t)curr_erasesize;
}
}
}
/* Now write the final entry */
erase_region_p->offset = begin;
erase_region_p->erasesize = curr_erasesize;
- erase_region_p->numblocks = (position - begin) / curr_erasesize;
+ tmp64 = position - begin;
+ do_div(tmp64, curr_erasesize);
+ erase_region_p->numblocks = tmp64;
}
return &concat->mtd;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 12:08:18 +0000