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-rw-r--r--fs/ext2/Kconfig1
-rw-r--r--fs/ext2/ext2.h1
-rw-r--r--fs/ext2/file.c76
-rw-r--r--fs/ext2/inode.c100
4 files changed, 152 insertions, 26 deletions
diff --git a/fs/ext2/Kconfig b/fs/ext2/Kconfig
index c634874e12d9..36bea5adcaba 100644
--- a/fs/ext2/Kconfig
+++ b/fs/ext2/Kconfig
@@ -1,5 +1,6 @@
config EXT2_FS
tristate "Second extended fs support"
+ select FS_IOMAP if FS_DAX
help
Ext2 is a standard Linux file system for hard disks.
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 06af2f92226c..37e2be784ac7 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -814,6 +814,7 @@ extern const struct file_operations ext2_file_operations;
/* inode.c */
extern const struct address_space_operations ext2_aops;
extern const struct address_space_operations ext2_nobh_aops;
+extern struct iomap_ops ext2_iomap_ops;
/* namei.c */
extern const struct inode_operations ext2_dir_inode_operations;
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index 5efeefe17abb..423cc01c9d41 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -22,11 +22,59 @@
#include <linux/pagemap.h>
#include <linux/dax.h>
#include <linux/quotaops.h>
+#include <linux/iomap.h>
+#include <linux/uio.h>
#include "ext2.h"
#include "xattr.h"
#include "acl.h"
#ifdef CONFIG_FS_DAX
+static ssize_t ext2_dax_read_iter(struct kiocb *iocb, struct iov_iter *to)
+{
+ struct inode *inode = iocb->ki_filp->f_mapping->host;
+ ssize_t ret;
+
+ if (!iov_iter_count(to))
+ return 0; /* skip atime */
+
+ inode_lock_shared(inode);
+ ret = iomap_dax_rw(iocb, to, &ext2_iomap_ops);
+ inode_unlock_shared(inode);
+
+ file_accessed(iocb->ki_filp);
+ return ret;
+}
+
+static ssize_t ext2_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
+{
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file->f_mapping->host;
+ ssize_t ret;
+
+ inode_lock(inode);
+ ret = generic_write_checks(iocb, from);
+ if (ret <= 0)
+ goto out_unlock;
+ ret = file_remove_privs(file);
+ if (ret)
+ goto out_unlock;
+ ret = file_update_time(file);
+ if (ret)
+ goto out_unlock;
+
+ ret = iomap_dax_rw(iocb, from, &ext2_iomap_ops);
+ if (ret > 0 && iocb->ki_pos > i_size_read(inode)) {
+ i_size_write(inode, iocb->ki_pos);
+ mark_inode_dirty(inode);
+ }
+
+out_unlock:
+ inode_unlock(inode);
+ if (ret > 0)
+ ret = generic_write_sync(iocb, ret);
+ return ret;
+}
+
/*
* The lock ordering for ext2 DAX fault paths is:
*
@@ -51,7 +99,7 @@ static int ext2_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
}
down_read(&ei->dax_sem);
- ret = dax_fault(vma, vmf, ext2_get_block);
+ ret = iomap_dax_fault(vma, vmf, &ext2_iomap_ops);
up_read(&ei->dax_sem);
if (vmf->flags & FAULT_FLAG_WRITE)
@@ -156,14 +204,28 @@ int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
return ret;
}
-/*
- * We have mostly NULL's here: the current defaults are ok for
- * the ext2 filesystem.
- */
+static ssize_t ext2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
+{
+#ifdef CONFIG_FS_DAX
+ if (IS_DAX(iocb->ki_filp->f_mapping->host))
+ return ext2_dax_read_iter(iocb, to);
+#endif
+ return generic_file_read_iter(iocb, to);
+}
+
+static ssize_t ext2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
+{
+#ifdef CONFIG_FS_DAX
+ if (IS_DAX(iocb->ki_filp->f_mapping->host))
+ return ext2_dax_write_iter(iocb, from);
+#endif
+ return generic_file_write_iter(iocb, from);
+}
+
const struct file_operations ext2_file_operations = {
.llseek = generic_file_llseek,
- .read_iter = generic_file_read_iter,
- .write_iter = generic_file_write_iter,
+ .read_iter = ext2_file_read_iter,
+ .write_iter = ext2_file_write_iter,
.unlocked_ioctl = ext2_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ext2_compat_ioctl,
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 303ae2bb269a..1e72d425fd3b 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -32,6 +32,7 @@
#include <linux/buffer_head.h>
#include <linux/mpage.h>
#include <linux/fiemap.h>
+#include <linux/iomap.h>
#include <linux/namei.h>
#include <linux/uio.h>
#include "ext2.h"
@@ -618,7 +619,7 @@ static void ext2_splice_branch(struct inode *inode,
*/
static int ext2_get_blocks(struct inode *inode,
sector_t iblock, unsigned long maxblocks,
- struct buffer_head *bh_result,
+ u32 *bno, bool *new, bool *boundary,
int create)
{
int err = -EIO;
@@ -644,7 +645,6 @@ static int ext2_get_blocks(struct inode *inode,
/* Simplest case - block found, no allocation needed */
if (!partial) {
first_block = le32_to_cpu(chain[depth - 1].key);
- clear_buffer_new(bh_result); /* What's this do? */
count++;
/*map more blocks*/
while (count < maxblocks && count <= blocks_to_boundary) {
@@ -699,7 +699,6 @@ static int ext2_get_blocks(struct inode *inode,
mutex_unlock(&ei->truncate_mutex);
if (err)
goto cleanup;
- clear_buffer_new(bh_result);
goto got_it;
}
}
@@ -755,15 +754,16 @@ static int ext2_get_blocks(struct inode *inode,
mutex_unlock(&ei->truncate_mutex);
goto cleanup;
}
- } else
- set_buffer_new(bh_result);
+ } else {
+ *new = true;
+ }
ext2_splice_branch(inode, iblock, partial, indirect_blks, count);
mutex_unlock(&ei->truncate_mutex);
got_it:
- map_bh(bh_result, inode->i_sb, le32_to_cpu(chain[depth-1].key));
+ *bno = le32_to_cpu(chain[depth-1].key);
if (count > blocks_to_boundary)
- set_buffer_boundary(bh_result);
+ *boundary = true;
err = count;
/* Clean up and exit */
partial = chain + depth - 1; /* the whole chain */
@@ -775,19 +775,82 @@ cleanup:
return err;
}
-int ext2_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
+int ext2_get_block(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create)
{
unsigned max_blocks = bh_result->b_size >> inode->i_blkbits;
- int ret = ext2_get_blocks(inode, iblock, max_blocks,
- bh_result, create);
- if (ret > 0) {
- bh_result->b_size = (ret << inode->i_blkbits);
- ret = 0;
+ bool new = false, boundary = false;
+ u32 bno;
+ int ret;
+
+ ret = ext2_get_blocks(inode, iblock, max_blocks, &bno, &new, &boundary,
+ create);
+ if (ret <= 0)
+ return ret;
+
+ map_bh(bh_result, inode->i_sb, bno);
+ bh_result->b_size = (ret << inode->i_blkbits);
+ if (new)
+ set_buffer_new(bh_result);
+ if (boundary)
+ set_buffer_boundary(bh_result);
+ return 0;
+
+}
+
+#ifdef CONFIG_FS_DAX
+static int ext2_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
+ unsigned flags, struct iomap *iomap)
+{
+ unsigned int blkbits = inode->i_blkbits;
+ unsigned long first_block = offset >> blkbits;
+ unsigned long max_blocks = (length + (1 << blkbits) - 1) >> blkbits;
+ bool new = false, boundary = false;
+ u32 bno;
+ int ret;
+
+ ret = ext2_get_blocks(inode, first_block, max_blocks,
+ &bno, &new, &boundary, flags & IOMAP_WRITE);
+ if (ret < 0)
+ return ret;
+
+ iomap->flags = 0;
+ iomap->bdev = inode->i_sb->s_bdev;
+ iomap->offset = (u64)first_block << blkbits;
+
+ if (ret == 0) {
+ iomap->type = IOMAP_HOLE;
+ iomap->blkno = IOMAP_NULL_BLOCK;
+ iomap->length = 1 << blkbits;
+ } else {
+ iomap->type = IOMAP_MAPPED;
+ iomap->blkno = (sector_t)bno << (blkbits - 9);
+ iomap->length = (u64)ret << blkbits;
+ iomap->flags |= IOMAP_F_MERGED;
}
- return ret;
+ if (new)
+ iomap->flags |= IOMAP_F_NEW;
+ return 0;
}
+static int
+ext2_iomap_end(struct inode *inode, loff_t offset, loff_t length,
+ ssize_t written, unsigned flags, struct iomap *iomap)
+{
+ if (iomap->type == IOMAP_MAPPED &&
+ written < length &&
+ (flags & IOMAP_WRITE))
+ ext2_write_failed(inode->i_mapping, offset + length);
+ return 0;
+}
+
+struct iomap_ops ext2_iomap_ops = {
+ .iomap_begin = ext2_iomap_begin,
+ .iomap_end = ext2_iomap_end,
+};
+#endif /* CONFIG_FS_DAX */
+
int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
u64 start, u64 len)
{
@@ -873,11 +936,10 @@ ext2_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
loff_t offset = iocb->ki_pos;
ssize_t ret;
- if (IS_DAX(inode))
- ret = dax_do_io(iocb, inode, iter, ext2_get_block, NULL,
- DIO_LOCKING);
- else
- ret = blockdev_direct_IO(iocb, inode, iter, ext2_get_block);
+ if (WARN_ON_ONCE(IS_DAX(inode)))
+ return -EIO;
+
+ ret = blockdev_direct_IO(iocb, inode, iter, ext2_get_block);
if (ret < 0 && iov_iter_rw(iter) == WRITE)
ext2_write_failed(mapping, offset + count);
return ret;