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Diffstat (limited to 'fs/logfs/dev_mtd.c')
-rw-r--r--fs/logfs/dev_mtd.c114
1 files changed, 67 insertions, 47 deletions
diff --git a/fs/logfs/dev_mtd.c b/fs/logfs/dev_mtd.c
index cafb6ef2e05..9c501449450 100644
--- a/fs/logfs/dev_mtd.c
+++ b/fs/logfs/dev_mtd.c
@@ -9,16 +9,18 @@
#include <linux/completion.h>
#include <linux/mount.h>
#include <linux/sched.h>
+#include <linux/slab.h>
#define PAGE_OFS(ofs) ((ofs) & (PAGE_SIZE-1))
-static int mtd_read(struct super_block *sb, loff_t ofs, size_t len, void *buf)
+static int logfs_mtd_read(struct super_block *sb, loff_t ofs, size_t len,
+ void *buf)
{
struct mtd_info *mtd = logfs_super(sb)->s_mtd;
size_t retlen;
int ret;
- ret = mtd->read(mtd, ofs, len, &retlen, buf);
+ ret = mtd_read(mtd, ofs, len, &retlen, buf);
BUG_ON(ret == -EINVAL);
if (ret)
return ret;
@@ -30,7 +32,8 @@ static int mtd_read(struct super_block *sb, loff_t ofs, size_t len, void *buf)
return 0;
}
-static int mtd_write(struct super_block *sb, loff_t ofs, size_t len, void *buf)
+static int loffs_mtd_write(struct super_block *sb, loff_t ofs, size_t len,
+ void *buf)
{
struct logfs_super *super = logfs_super(sb);
struct mtd_info *mtd = super->s_mtd;
@@ -46,7 +49,7 @@ static int mtd_write(struct super_block *sb, loff_t ofs, size_t len, void *buf)
BUG_ON(len > PAGE_CACHE_SIZE);
page_start = ofs & PAGE_CACHE_MASK;
page_end = PAGE_CACHE_ALIGN(ofs + len) - 1;
- ret = mtd->write(mtd, ofs, len, &retlen, buf);
+ ret = mtd_write(mtd, ofs, len, &retlen, buf);
if (ret || (retlen != len))
return -EIO;
@@ -59,14 +62,15 @@ static int mtd_write(struct super_block *sb, loff_t ofs, size_t len, void *buf)
* asynchronous properties. So just to prevent the first implementor of such
* a thing from breaking logfs in 2350, we do the usual pointless dance to
* declare a completion variable and wait for completion before returning
- * from mtd_erase(). What an excercise in futility!
+ * from logfs_mtd_erase(). What an exercise in futility!
*/
static void logfs_erase_callback(struct erase_info *ei)
{
complete((struct completion *)ei->priv);
}
-static int mtd_erase_mapping(struct super_block *sb, loff_t ofs, size_t len)
+static int logfs_mtd_erase_mapping(struct super_block *sb, loff_t ofs,
+ size_t len)
{
struct logfs_super *super = logfs_super(sb);
struct address_space *mapping = super->s_mapping_inode->i_mapping;
@@ -83,7 +87,7 @@ static int mtd_erase_mapping(struct super_block *sb, loff_t ofs, size_t len)
return 0;
}
-static int mtd_erase(struct super_block *sb, loff_t ofs, size_t len,
+static int logfs_mtd_erase(struct super_block *sb, loff_t ofs, size_t len,
int ensure_write)
{
struct mtd_info *mtd = logfs_super(sb)->s_mtd;
@@ -101,32 +105,32 @@ static int mtd_erase(struct super_block *sb, loff_t ofs, size_t len,
ei.len = len;
ei.callback = logfs_erase_callback;
ei.priv = (long)&complete;
- ret = mtd->erase(mtd, &ei);
+ ret = mtd_erase(mtd, &ei);
if (ret)
return -EIO;
wait_for_completion(&complete);
if (ei.state != MTD_ERASE_DONE)
return -EIO;
- return mtd_erase_mapping(sb, ofs, len);
+ return logfs_mtd_erase_mapping(sb, ofs, len);
}
-static void mtd_sync(struct super_block *sb)
+static void logfs_mtd_sync(struct super_block *sb)
{
struct mtd_info *mtd = logfs_super(sb)->s_mtd;
- if (mtd->sync)
- mtd->sync(mtd);
+ mtd_sync(mtd);
}
-static int mtd_readpage(void *_sb, struct page *page)
+static int logfs_mtd_readpage(void *_sb, struct page *page)
{
struct super_block *sb = _sb;
int err;
- err = mtd_read(sb, page->index << PAGE_SHIFT, PAGE_SIZE,
+ err = logfs_mtd_read(sb, page->index << PAGE_SHIFT, PAGE_SIZE,
page_address(page));
- if (err == -EUCLEAN) {
+ if (err == -EUCLEAN || err == -EBADMSG) {
+ /* -EBADMSG happens regularly on power failures */
err = 0;
/* FIXME: force GC this segment */
}
@@ -141,18 +145,15 @@ static int mtd_readpage(void *_sb, struct page *page)
return err;
}
-static struct page *mtd_find_first_sb(struct super_block *sb, u64 *ofs)
+static struct page *logfs_mtd_find_first_sb(struct super_block *sb, u64 *ofs)
{
struct logfs_super *super = logfs_super(sb);
struct address_space *mapping = super->s_mapping_inode->i_mapping;
- filler_t *filler = mtd_readpage;
+ filler_t *filler = logfs_mtd_readpage;
struct mtd_info *mtd = super->s_mtd;
- if (!mtd->block_isbad)
- return NULL;
-
*ofs = 0;
- while (mtd->block_isbad(mtd, *ofs)) {
+ while (mtd_block_isbad(mtd, *ofs)) {
*ofs += mtd->erasesize;
if (*ofs >= mtd->size)
return NULL;
@@ -161,18 +162,15 @@ static struct page *mtd_find_first_sb(struct super_block *sb, u64 *ofs)
return read_cache_page(mapping, *ofs >> PAGE_SHIFT, filler, sb);
}
-static struct page *mtd_find_last_sb(struct super_block *sb, u64 *ofs)
+static struct page *logfs_mtd_find_last_sb(struct super_block *sb, u64 *ofs)
{
struct logfs_super *super = logfs_super(sb);
struct address_space *mapping = super->s_mapping_inode->i_mapping;
- filler_t *filler = mtd_readpage;
+ filler_t *filler = logfs_mtd_readpage;
struct mtd_info *mtd = super->s_mtd;
- if (!mtd->block_isbad)
- return NULL;
-
*ofs = mtd->size - mtd->erasesize;
- while (mtd->block_isbad(mtd, *ofs)) {
+ while (mtd_block_isbad(mtd, *ofs)) {
*ofs -= mtd->erasesize;
if (*ofs <= 0)
return NULL;
@@ -182,7 +180,7 @@ static struct page *mtd_find_last_sb(struct super_block *sb, u64 *ofs)
return read_cache_page(mapping, *ofs >> PAGE_SHIFT, filler, sb);
}
-static int __mtd_writeseg(struct super_block *sb, u64 ofs, pgoff_t index,
+static int __logfs_mtd_writeseg(struct super_block *sb, u64 ofs, pgoff_t index,
size_t nr_pages)
{
struct logfs_super *super = logfs_super(sb);
@@ -194,8 +192,8 @@ static int __mtd_writeseg(struct super_block *sb, u64 ofs, pgoff_t index,
page = find_lock_page(mapping, index + i);
BUG_ON(!page);
- err = mtd_write(sb, page->index << PAGE_SHIFT, PAGE_SIZE,
- page_address(page));
+ err = loffs_mtd_write(sb, page->index << PAGE_SHIFT, PAGE_SIZE,
+ page_address(page));
unlock_page(page);
page_cache_release(page);
if (err)
@@ -204,7 +202,7 @@ static int __mtd_writeseg(struct super_block *sb, u64 ofs, pgoff_t index,
return 0;
}
-static void mtd_writeseg(struct super_block *sb, u64 ofs, size_t len)
+static void logfs_mtd_writeseg(struct super_block *sb, u64 ofs, size_t len)
{
struct logfs_super *super = logfs_super(sb);
int head;
@@ -225,30 +223,52 @@ static void mtd_writeseg(struct super_block *sb, u64 ofs, size_t len)
len += head;
}
len = PAGE_ALIGN(len);
- __mtd_writeseg(sb, ofs, ofs >> PAGE_SHIFT, len >> PAGE_SHIFT);
+ __logfs_mtd_writeseg(sb, ofs, ofs >> PAGE_SHIFT, len >> PAGE_SHIFT);
+}
+
+static void logfs_mtd_put_device(struct logfs_super *s)
+{
+ put_mtd_device(s->s_mtd);
}
-static void mtd_put_device(struct super_block *sb)
+static int logfs_mtd_can_write_buf(struct super_block *sb, u64 ofs)
{
- put_mtd_device(logfs_super(sb)->s_mtd);
+ struct logfs_super *super = logfs_super(sb);
+ void *buf;
+ int err;
+
+ buf = kmalloc(super->s_writesize, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+ err = logfs_mtd_read(sb, ofs, super->s_writesize, buf);
+ if (err)
+ goto out;
+ if (memchr_inv(buf, 0xff, super->s_writesize))
+ err = -EIO;
+ kfree(buf);
+out:
+ return err;
}
static const struct logfs_device_ops mtd_devops = {
- .find_first_sb = mtd_find_first_sb,
- .find_last_sb = mtd_find_last_sb,
- .readpage = mtd_readpage,
- .writeseg = mtd_writeseg,
- .erase = mtd_erase,
- .sync = mtd_sync,
- .put_device = mtd_put_device,
+ .find_first_sb = logfs_mtd_find_first_sb,
+ .find_last_sb = logfs_mtd_find_last_sb,
+ .readpage = logfs_mtd_readpage,
+ .writeseg = logfs_mtd_writeseg,
+ .erase = logfs_mtd_erase,
+ .can_write_buf = logfs_mtd_can_write_buf,
+ .sync = logfs_mtd_sync,
+ .put_device = logfs_mtd_put_device,
};
-int logfs_get_sb_mtd(struct file_system_type *type, int flags,
- int mtdnr, struct vfsmount *mnt)
+int logfs_get_sb_mtd(struct logfs_super *s, int mtdnr)
{
- struct mtd_info *mtd;
- const struct logfs_device_ops *devops = &mtd_devops;
+ struct mtd_info *mtd = get_mtd_device(NULL, mtdnr);
+ if (IS_ERR(mtd))
+ return PTR_ERR(mtd);
- mtd = get_mtd_device(NULL, mtdnr);
- return logfs_get_sb_device(type, flags, mtd, NULL, devops, mnt);
+ s->s_bdev = NULL;
+ s->s_mtd = mtd;
+ s->s_devops = &mtd_devops;
+ return 0;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-06 08:13:58 +0000