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authorDave Chinner <david@fromorbit.com>2016-10-03 09:53:59 +1100
committerDave Chinner <david@fromorbit.com>2016-10-03 09:53:59 +1100
commita1f45e668e14c26b4700b1936c5a41b58cc4ac74 (patch)
tree94c1d2b34c15fff8ff39baf7357673978b5a3b2f
parenta89b3f97bb7c248aea155a90f31d3dfb93b75971 (diff)
parentd5bfccdf38d094f2b15fae8b361d7bd47f2509d6 (diff)
Merge branch 'iomap-4.9-dax' into for-next
-rw-r--r--fs/dax.c252
-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
-rw-r--r--fs/internal.h11
-rw-r--r--fs/iomap.c5
-rw-r--r--fs/xfs/xfs_aops.c31
-rw-r--r--fs/xfs/xfs_aops.h1
-rw-r--r--fs/xfs/xfs_file.c79
-rw-r--r--fs/xfs/xfs_iomap.c22
-rw-r--r--include/linux/dax.h6
-rw-r--r--include/linux/iomap.h1
13 files changed, 464 insertions, 122 deletions
diff --git a/fs/dax.c b/fs/dax.c
index 993dc6fe0416..cc025f82ef07 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -31,6 +31,8 @@
#include <linux/vmstat.h>
#include <linux/pfn_t.h>
#include <linux/sizes.h>
+#include <linux/iomap.h>
+#include "internal.h"
/*
* We use lowest available bit in exceptional entry for locking, other two
@@ -580,14 +582,13 @@ static int dax_load_hole(struct address_space *mapping, void *entry,
return VM_FAULT_LOCKED;
}
-static int copy_user_bh(struct page *to, struct inode *inode,
- struct buffer_head *bh, unsigned long vaddr)
+static int copy_user_dax(struct block_device *bdev, sector_t sector, size_t size,
+ struct page *to, unsigned long vaddr)
{
struct blk_dax_ctl dax = {
- .sector = to_sector(bh, inode),
- .size = bh->b_size,
+ .sector = sector,
+ .size = size,
};
- struct block_device *bdev = bh->b_bdev;
void *vto;
if (dax_map_atomic(bdev, &dax) < 0)
@@ -790,14 +791,13 @@ int dax_writeback_mapping_range(struct address_space *mapping,
EXPORT_SYMBOL_GPL(dax_writeback_mapping_range);
static int dax_insert_mapping(struct address_space *mapping,
- struct buffer_head *bh, void **entryp,
- struct vm_area_struct *vma, struct vm_fault *vmf)
+ struct block_device *bdev, sector_t sector, size_t size,
+ void **entryp, struct vm_area_struct *vma, struct vm_fault *vmf)
{
unsigned long vaddr = (unsigned long)vmf->virtual_address;
- struct block_device *bdev = bh->b_bdev;
struct blk_dax_ctl dax = {
- .sector = to_sector(bh, mapping->host),
- .size = bh->b_size,
+ .sector = sector,
+ .size = size,
};
void *ret;
void *entry = *entryp;
@@ -868,7 +868,8 @@ int dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
if (vmf->cow_page) {
struct page *new_page = vmf->cow_page;
if (buffer_written(&bh))
- error = copy_user_bh(new_page, inode, &bh, vaddr);
+ error = copy_user_dax(bh.b_bdev, to_sector(&bh, inode),
+ bh.b_size, new_page, vaddr);
else
clear_user_highpage(new_page, vaddr);
if (error)
@@ -898,7 +899,8 @@ int dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
/* Filesystem should not return unwritten buffers to us! */
WARN_ON_ONCE(buffer_unwritten(&bh) || buffer_new(&bh));
- error = dax_insert_mapping(mapping, &bh, &entry, vma, vmf);
+ error = dax_insert_mapping(mapping, bh.b_bdev, to_sector(&bh, inode),
+ bh.b_size, &entry, vma, vmf);
unlock_entry:
put_locked_mapping_entry(mapping, vmf->pgoff, entry);
out:
@@ -1241,3 +1243,229 @@ int dax_truncate_page(struct inode *inode, loff_t from, get_block_t get_block)
return dax_zero_page_range(inode, from, length, get_block);
}
EXPORT_SYMBOL_GPL(dax_truncate_page);
+
+#ifdef CONFIG_FS_IOMAP
+static loff_t
+iomap_dax_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
+ struct iomap *iomap)
+{
+ struct iov_iter *iter = data;
+ loff_t end = pos + length, done = 0;
+ ssize_t ret = 0;
+
+ if (iov_iter_rw(iter) == READ) {
+ end = min(end, i_size_read(inode));
+ if (pos >= end)
+ return 0;
+
+ if (iomap->type == IOMAP_HOLE || iomap->type == IOMAP_UNWRITTEN)
+ return iov_iter_zero(min(length, end - pos), iter);
+ }
+
+ if (WARN_ON_ONCE(iomap->type != IOMAP_MAPPED))
+ return -EIO;
+
+ while (pos < end) {
+ unsigned offset = pos & (PAGE_SIZE - 1);
+ struct blk_dax_ctl dax = { 0 };
+ ssize_t map_len;
+
+ dax.sector = iomap->blkno +
+ (((pos & PAGE_MASK) - iomap->offset) >> 9);
+ dax.size = (length + offset + PAGE_SIZE - 1) & PAGE_MASK;
+ map_len = dax_map_atomic(iomap->bdev, &dax);
+ if (map_len < 0) {
+ ret = map_len;
+ break;
+ }
+
+ dax.addr += offset;
+ map_len -= offset;
+ if (map_len > end - pos)
+ map_len = end - pos;
+
+ if (iov_iter_rw(iter) == WRITE)
+ map_len = copy_from_iter_pmem(dax.addr, map_len, iter);
+ else
+ map_len = copy_to_iter(dax.addr, map_len, iter);
+ dax_unmap_atomic(iomap->bdev, &dax);
+ if (map_len <= 0) {
+ ret = map_len ? map_len : -EFAULT;
+ break;
+ }
+
+ pos += map_len;
+ length -= map_len;
+ done += map_len;
+ }
+
+ return done ? done : ret;
+}
+
+/**
+ * iomap_dax_rw - Perform I/O to a DAX file
+ * @iocb: The control block for this I/O
+ * @iter: The addresses to do I/O from or to
+ * @ops: iomap ops passed from the file system
+ *
+ * This function performs read and write operations to directly mapped
+ * persistent memory. The callers needs to take care of read/write exclusion
+ * and evicting any page cache pages in the region under I/O.
+ */
+ssize_t
+iomap_dax_rw(struct kiocb *iocb, struct iov_iter *iter,
+ struct iomap_ops *ops)
+{
+ struct address_space *mapping = iocb->ki_filp->f_mapping;
+ struct inode *inode = mapping->host;
+ loff_t pos = iocb->ki_pos, ret = 0, done = 0;
+ unsigned flags = 0;
+
+ if (iov_iter_rw(iter) == WRITE)
+ flags |= IOMAP_WRITE;
+
+ /*
+ * Yes, even DAX files can have page cache attached to them: A zeroed
+ * page is inserted into the pagecache when we have to serve a write
+ * fault on a hole. It should never be dirtied and can simply be
+ * dropped from the pagecache once we get real data for the page.
+ *
+ * XXX: This is racy against mmap, and there's nothing we can do about
+ * it. We'll eventually need to shift this down even further so that
+ * we can check if we allocated blocks over a hole first.
+ */
+ if (mapping->nrpages) {
+ ret = invalidate_inode_pages2_range(mapping,
+ pos >> PAGE_SHIFT,
+ (pos + iov_iter_count(iter) - 1) >> PAGE_SHIFT);
+ WARN_ON_ONCE(ret);
+ }
+
+ while (iov_iter_count(iter)) {
+ ret = iomap_apply(inode, pos, iov_iter_count(iter), flags, ops,
+ iter, iomap_dax_actor);
+ if (ret <= 0)
+ break;
+ pos += ret;
+ done += ret;
+ }
+
+ iocb->ki_pos += done;
+ return done ? done : ret;
+}
+EXPORT_SYMBOL_GPL(iomap_dax_rw);
+
+/**
+ * iomap_dax_fault - handle a page fault on a DAX file
+ * @vma: The virtual memory area where the fault occurred
+ * @vmf: The description of the fault
+ * @ops: iomap ops passed from the file system
+ *
+ * When a page fault occurs, filesystems may call this helper in their fault
+ * or mkwrite handler for DAX files. Assumes the caller has done all the
+ * necessary locking for the page fault to proceed successfully.
+ */
+int iomap_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
+ struct iomap_ops *ops)
+{
+ struct address_space *mapping = vma->vm_file->f_mapping;
+ struct inode *inode = mapping->host;
+ unsigned long vaddr = (unsigned long)vmf->virtual_address;
+ loff_t pos = (loff_t)vmf->pgoff << PAGE_SHIFT;
+ sector_t sector;
+ struct iomap iomap = { 0 };
+ unsigned flags = 0;
+ int error, major = 0;
+ void *entry;
+
+ /*
+ * Check whether offset isn't beyond end of file now. Caller is supposed
+ * to hold locks serializing us with truncate / punch hole so this is
+ * a reliable test.
+ */
+ if (pos >= i_size_read(inode))
+ return VM_FAULT_SIGBUS;
+
+ entry = grab_mapping_entry(mapping, vmf->pgoff);
+ if (IS_ERR(entry)) {
+ error = PTR_ERR(entry);
+ goto out;
+ }
+
+ if ((vmf->flags & FAULT_FLAG_WRITE) && !vmf->cow_page)
+ flags |= IOMAP_WRITE;
+
+ /*
+ * Note that we don't bother to use iomap_apply here: DAX required
+ * the file system block size to be equal the page size, which means
+ * that we never have to deal with more than a single extent here.
+ */
+ error = ops->iomap_begin(inode, pos, PAGE_SIZE, flags, &iomap);
+ if (error)
+ goto unlock_entry;
+ if (WARN_ON_ONCE(iomap.offset + iomap.length < pos + PAGE_SIZE)) {
+ error = -EIO; /* fs corruption? */
+ goto unlock_entry;
+ }
+
+ sector = iomap.blkno + (((pos & PAGE_MASK) - iomap.offset) >> 9);
+
+ if (vmf->cow_page) {
+ switch (iomap.type) {
+ case IOMAP_HOLE:
+ case IOMAP_UNWRITTEN:
+ clear_user_highpage(vmf->cow_page, vaddr);
+ break;
+ case IOMAP_MAPPED:
+ error = copy_user_dax(iomap.bdev, sector, PAGE_SIZE,
+ vmf->cow_page, vaddr);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ error = -EIO;
+ break;
+ }
+
+ if (error)
+ goto unlock_entry;
+ if (!radix_tree_exceptional_entry(entry)) {
+ vmf->page = entry;
+ return VM_FAULT_LOCKED;
+ }
+ vmf->entry = entry;
+ return VM_FAULT_DAX_LOCKED;
+ }
+
+ switch (iomap.type) {
+ case IOMAP_MAPPED:
+ if (iomap.flags & IOMAP_F_NEW) {
+ count_vm_event(PGMAJFAULT);
+ mem_cgroup_count_vm_event(vma->vm_mm, PGMAJFAULT);
+ major = VM_FAULT_MAJOR;
+ }
+ error = dax_insert_mapping(mapping, iomap.bdev, sector,
+ PAGE_SIZE, &entry, vma, vmf);
+ break;
+ case IOMAP_UNWRITTEN:
+ case IOMAP_HOLE:
+ if (!(vmf->flags & FAULT_FLAG_WRITE))
+ return dax_load_hole(mapping, entry, vmf);
+ /*FALLTHRU*/
+ default:
+ WARN_ON_ONCE(1);
+ error = -EIO;
+ break;
+ }
+
+ unlock_entry:
+ put_locked_mapping_entry(mapping, vmf->pgoff, entry);
+ out:
+ if (error == -ENOMEM)
+ return VM_FAULT_OOM | major;
+ /* -EBUSY is fine, somebody else faulted on the same PTE */
+ if (error < 0 && error != -EBUSY)
+ return VM_FAULT_SIGBUS | major;
+ return VM_FAULT_NOPAGE | major;
+}
+EXPORT_SYMBOL_GPL(iomap_dax_fault);
+#endif /* CONFIG_FS_IOMAP */
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 d5c7d09919f3..c7dbb4661119 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;
}
}
@@ -745,15 +744,16 @@ 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 */
@@ -765,19 +765,82 @@ 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)
{
@@ -863,11 +926,10 @@ 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;
diff --git a/fs/internal.h b/fs/internal.h
index ba0737649d4a..859178692ce4 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -12,6 +12,7 @@
struct super_block;
struct file_system_type;
struct iomap;
+struct iomap_ops;
struct linux_binprm;
struct path;
struct mount;
@@ -164,3 +165,13 @@ extern struct dentry_operations ns_dentry_operations;
extern int do_vfs_ioctl(struct file *file, unsigned int fd, unsigned int cmd,
unsigned long arg);
extern long vfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
+
+/*
+ * iomap support:
+ */
+typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len,
+ void *data, struct iomap *iomap);
+
+loff_t iomap_apply(struct inode *inode, loff_t pos, loff_t length,
+ unsigned flags, struct iomap_ops *ops, void *data,
+ iomap_actor_t actor);
diff --git a/fs/iomap.c b/fs/iomap.c
index ec411a6b9edc..013d1d36fbbf 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -27,9 +27,6 @@
#include <linux/dax.h>
#include "internal.h"
-typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len,
- void *data, struct iomap *iomap);
-
/*
* Execute a iomap write on a segment of the mapping that spans a
* contiguous range of pages that have identical block mapping state.
@@ -41,7 +38,7 @@ typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len,
* resources they require in the iomap_begin call, and release them in the
* iomap_end call.
*/
-static loff_t
+loff_t
iomap_apply(struct inode *inode, loff_t pos, loff_t length, unsigned flags,
struct iomap_ops *ops, void *data, iomap_actor_t actor)
{
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 7575cfc3ad15..4a28fa91e3b1 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -200,7 +200,7 @@ xfs_setfilesize_trans_alloc(
* Update on-disk file size now that data has been written to disk.
*/
STATIC int
-xfs_setfilesize(
+__xfs_setfilesize(
struct xfs_inode *ip,
struct xfs_trans *tp,
xfs_off_t offset,
@@ -225,6 +225,23 @@ xfs_setfilesize(
return xfs_trans_commit(tp);
}
+int
+xfs_setfilesize(
+ struct xfs_inode *ip,
+ xfs_off_t offset,
+ size_t size)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_trans *tp;
+ int error;
+
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
+ if (error)
+ return error;
+
+ return __xfs_setfilesize(ip, tp, offset, size);
+}
+
STATIC int
xfs_setfilesize_ioend(
struct xfs_ioend *ioend,
@@ -247,7 +264,7 @@ xfs_setfilesize_ioend(
return error;
}
- return xfs_setfilesize(ip, tp, ioend->io_offset, ioend->io_size);
+ return __xfs_setfilesize(ip, tp, ioend->io_offset, ioend->io_size);
}
/*
@@ -1336,13 +1353,12 @@ xfs_end_io_direct_write(
{
struct inode *inode = file_inode(iocb->ki_filp);
struct xfs_inode *ip = XFS_I(inode);
- struct xfs_mount *mp = ip->i_mount;
uintptr_t flags = (uintptr_t)private;
int error = 0;
trace_xfs_end_io_direct_write(ip, offset, size);
- if (XFS_FORCED_SHUTDOWN(mp))
+ if (XFS_FORCED_SHUTDOWN(ip->i_mount))
return -EIO;
if (size <= 0)
@@ -1380,14 +1396,9 @@ xfs_end_io_direct_write(
error = xfs_iomap_write_unwritten(ip, offset, size);
} else if (flags & XFS_DIO_FLAG_APPEND) {
- struct xfs_trans *tp;
-
trace_xfs_end_io_direct_write_append(ip, offset, size);
- error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0,
- &tp);
- if (!error)
- error = xfs_setfilesize(ip, tp, offset, size);
+ error = xfs_setfilesize(ip, offset, size);
}
return error;
diff --git a/fs/xfs/xfs_aops.h b/fs/xfs/xfs_aops.h
index bf2d9a141a73..1950e3bca2ac 100644
--- a/fs/xfs/xfs_aops.h
+++ b/fs/xfs/xfs_aops.h
@@ -62,6 +62,7 @@ int xfs_get_blocks_dax_fault(struct inode *inode, sector_t offset,
int xfs_end_io_direct_write(struct kiocb *iocb, loff_t offset,
ssize_t size, void *private);
+int xfs_setfilesize(struct xfs_inode *ip, xfs_off_t offset, size_t size);
extern void xfs_count_page_state(struct page *, int *, int *);
extern struct block_device *xfs_find_bdev_for_inode(struct inode *);
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index b927ea9abe33..c68517b0f248 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -333,10 +333,7 @@ xfs_file_dax_read(
struct kiocb *iocb,
struct iov_iter *to)
{
- struct address_space *mapping = iocb->ki_filp->f_mapping;
- struct inode *inode = mapping->host;
- struct xfs_inode *ip = XFS_I(inode);
- struct iov_iter data = *to;
+ struct xfs_inode *ip = XFS_I(iocb->ki_filp->f_mapping->host);
size_t count = iov_iter_count(to);
ssize_t ret = 0;
@@ -346,11 +343,7 @@ xfs_file_dax_read(
return 0; /* skip atime */
xfs_rw_ilock(ip, XFS_IOLOCK_SHARED);
- ret = dax_do_io(iocb, inode, &data, xfs_get_blocks_direct, NULL, 0);
- if (ret > 0) {
- iocb->ki_pos += ret;
- iov_iter_advance(to, ret);
- }
+ ret = iomap_dax_rw(iocb, to, &xfs_iomap_ops);
xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);
file_accessed(iocb->ki_filp);
@@ -712,70 +705,32 @@ xfs_file_dax_write(
struct kiocb *iocb,
struct iov_iter *from)
{
- struct address_space *mapping = iocb->ki_filp->f_mapping;
- struct inode *inode = mapping->host;
+ struct inode *inode = iocb->ki_filp->f_mapping->host;
struct xfs_inode *ip = XFS_I(inode);
- struct xfs_mount *mp = ip->i_mount;
- ssize_t ret = 0;
- int unaligned_io = 0;
- int iolock;
- struct iov_iter data;
+ int iolock = XFS_IOLOCK_EXCL;
+ ssize_t ret, error = 0;
+ size_t count;
+ loff_t pos;
- /* "unaligned" here means not aligned to a filesystem block */
- if ((iocb->ki_pos & mp->m_blockmask) ||
- ((iocb->ki_pos + iov_iter_count(from)) & mp->m_blockmask)) {
- unaligned_io = 1;
- iolock = XFS_IOLOCK_EXCL;
- } else if (mapping->nrpages) {
- iolock = XFS_IOLOCK_EXCL;
- } else {
- iolock = XFS_IOLOCK_SHARED;
- }
xfs_rw_ilock(ip, iolock);
-
ret = xfs_file_aio_write_checks(iocb, from, &iolock);
if (ret)
goto out;
- /*
- * Yes, even DAX files can have page cache attached to them: A zeroed
- * page is inserted into the pagecache when we have to serve a write
- * fault on a hole. It should never be dirtied and can simply be
- * dropped from the pagecache once we get real data for the page.
- *
- * XXX: This is racy against mmap, and there's nothing we can do about
- * it. dax_do_io() should really do this invalidation internally as
- * it will know if we've allocated over a holei for this specific IO and
- * if so it needs to update the mapping tree and invalidate existing
- * PTEs over the newly allocated range. Remove this invalidation when
- * dax_do_io() is fixed up.
- */
- if (mapping->nrpages) {
- loff_t end = iocb->ki_pos + iov_iter_count(from) - 1;
+ pos = iocb->ki_pos;
+ count = iov_iter_count(from);
- ret = invalidate_inode_pages2_range(mapping,
- iocb->ki_pos >> PAGE_SHIFT,
- end >> PAGE_SHIFT);
- WARN_ON_ONCE(ret);
- }
+ trace_xfs_file_dax_write(ip, count, pos);
- if (iolock == XFS_IOLOCK_EXCL && !unaligned_io) {
- xfs_rw_ilock_demote(ip, XFS_IOLOCK_EXCL);
- iolock = XFS_IOLOCK_SHARED;
+ ret = iomap_dax_rw(iocb, from, &xfs_iomap_ops);
+ if (ret > 0 && iocb->ki_pos > i_size_read(inode)) {
+ i_size_write(inode, iocb->ki_pos);
+ error = xfs_setfilesize(ip, pos, ret);
}
- trace_xfs_file_dax_write(ip, iov_iter_count(from), iocb->ki_pos);
-
- data = *from;
- ret = dax_do_io(iocb, inode, &data, xfs_get_blocks_direct,
- xfs_end_io_direct_write, 0);
- if (ret > 0) {
- iocb->ki_pos += ret;
- iov_iter_advance(from, ret);
- }
out:
xfs_rw_iunlock(ip, iolock);
- return ret;
+ return error ? error : ret;
}
STATIC ssize_t
@@ -1514,7 +1469,7 @@ xfs_filemap_page_mkwrite(
xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
if (IS_DAX(inode)) {
- ret = dax_mkwrite(vma, vmf, xfs_get_blocks_dax_fault);
+ ret = iomap_dax_fault(vma, vmf, &xfs_iomap_ops);
} else {
ret = iomap_page_mkwrite(vma, vmf, &xfs_iomap_ops);
ret = block_page_mkwrite_return(ret);
@@ -1548,7 +1503,7 @@ xfs_filemap_fault(
* changes to xfs_get_blocks_direct() to map unwritten extent
* ioend for conversion on read-only mappings.
*/
- ret = dax_fault(vma, vmf, xfs_get_blocks_dax_fault);
+ ret = iomap_dax_fault(vma, vmf, &xfs_iomap_ops);
} else
ret = filemap_fault(vma, vmf);
xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index f96c8ffce5f4..c08253e11545 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -934,11 +934,13 @@ error_on_bmapi_transaction:
return error;
}
-static inline bool imap_needs_alloc(struct xfs_bmbt_irec *imap, int nimaps)
+static inline bool imap_needs_alloc(struct inode *inode,
+ struct xfs_bmbt_irec *imap, int nimaps)
{
return !nimaps ||
imap->br_startblock == HOLESTARTBLOCK ||
- imap->br_startblock == DELAYSTARTBLOCK;
+ imap->br_startblock == DELAYSTARTBLOCK ||
+ (IS_DAX(inode) && ISUNWRITTEN(imap));
}
static int
@@ -954,16 +956,18 @@ xfs_file_iomap_begin(
struct xfs_bmbt_irec imap;
xfs_fileoff_t offset_fsb, end_fsb;
int nimaps = 1, error = 0;
+ unsigned lockmode;
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
- if ((flags & IOMAP_WRITE) && !xfs_get_extsz_hint(ip)) {
+ if ((flags & IOMAP_WRITE) &&
+ !IS_DAX(inode) && !xfs_get_extsz_hint(ip)) {
return xfs_file_iomap_begin_delay(inode, offset, length, flags,
iomap);
}
- xfs_ilock(ip, XFS_ILOCK_EXCL);
+ lockmode = xfs_ilock_data_map_shared(ip);
ASSERT(offset <= mp->m_super->s_maxbytes);
if ((xfs_fsize_t)offset + length > mp->m_super->s_maxbytes)
@@ -974,11 +978,11 @@ xfs_file_iomap_begin(
error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
&nimaps, XFS_BMAPI_ENTIRE);
if (error) {
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ xfs_iunlock(ip, lockmode);
return error;
}
- if ((flags & IOMAP_WRITE) && imap_needs_alloc(&imap, nimaps)) {
+ if ((flags & IOMAP_WRITE) && imap_needs_alloc(inode, &imap, nimaps)) {
/*
* We cap the maximum length we map here to MAX_WRITEBACK_PAGES
* pages to keep the chunks of work done where somewhat symmetric
@@ -994,17 +998,19 @@ xfs_file_iomap_begin(
* xfs_iomap_write_direct() expects the shared lock. It
* is unlocked on return.
*/
- xfs_ilock_demote(ip, XFS_ILOCK_EXCL);
+ if (lockmode == XFS_ILOCK_EXCL)
+ xfs_ilock_demote(ip, lockmode);
error = xfs_iomap_write_direct(ip, offset, length, &imap,
nimaps);
if (error)
return error;
+ iomap->flags = IOMAP_F_NEW;
trace_xfs_iomap_alloc(ip, offset, length, 0, &imap);
} else {
ASSERT(nimaps);
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ xfs_iunlock(ip, lockmode);
trace_xfs_iomap_found(ip, offset, length, 0, &imap);
}
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 9c6dc7704043..add6c4bc568f 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -6,13 +6,19 @@
#include <linux/radix-tree.h>
#include <asm/pgtable.h>
+struct iomap_ops;
+
/* We use lowest available exceptional entry bit for locking */
#define RADIX_DAX_ENTRY_LOCK (1 << RADIX_TREE_EXCEPTIONAL_SHIFT)
+ssize_t iomap_dax_rw(struct kiocb *iocb, struct iov_iter *iter,
+ struct iomap_ops *ops);
ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *,
get_block_t, dio_iodone_t, int flags);
int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t);
int dax_truncate_page(struct inode *, loff_t from, get_block_t);
+int iomap_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
+ struct iomap_ops *ops);
int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t);
int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
void dax_wake_mapping_entry_waiter(struct address_space *mapping,
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index c74226a738a3..e63e288dee83 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -23,6 +23,7 @@ struct vm_fault;
*/
#define IOMAP_F_MERGED 0x01 /* contains multiple blocks/extents */
#define IOMAP_F_SHARED 0x02 /* block shared with another file */
+#define IOMAP_F_NEW 0x04 /* blocks have been newly allocated */
/*
* Magic value for blkno: