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authorLinus Torvalds <torvalds@linux-foundation.org>2016-10-06 08:18:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-06 08:18:10 -0700
commit8d370595811e13378243832006f8c52bbc9cca5e (patch)
tree8cab6785c7fedd8d648b51db0ec420f610b2cd2a /fs/ext2
parentd230ec72c4efed7d0f414a80a756c54d4c422a6e (diff)
parent155cd433b516506df065866f3d974661f6473572 (diff)
downloadop-kernel-dev-8d370595811e13378243832006f8c52bbc9cca5e.zip
op-kernel-dev-8d370595811e13378243832006f8c52bbc9cca5e.tar.gz
Merge tag 'xfs-for-linus-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs
Pull xfs and iomap updates from Dave Chinner: "The main things in this update are the iomap-based DAX infrastructure, an XFS delalloc rework, and a chunk of fixes to how log recovery schedules writeback to prevent spurious corruption detections when recovery of certain items was not required. The other main chunk of code is some preparation for the upcoming reflink functionality. Most of it is generic and cleanups that stand alone, but they were ready and reviewed so are in this pull request. Speaking of reflink, I'm currently planning to send you another pull request next week containing all the new reflink functionality. I'm working through a similar process to the last cycle, where I sent the reverse mapping code in a separate request because of how large it was. The reflink code merge is even bigger than reverse mapping, so I'll be doing the same thing again.... Summary for this update: - change of XFS mailing list to linux-xfs@vger.kernel.org - iomap-based DAX infrastructure w/ XFS and ext2 support - small iomap fixes and additions - more efficient XFS delayed allocation infrastructure based on iomap - a rework of log recovery writeback scheduling to ensure we don't fail recovery when trying to replay items that are already on disk - some preparation patches for upcoming reflink support - configurable error handling fixes and documentation - aio access time update race fixes for XFS and generic_file_read_iter" * tag 'xfs-for-linus-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs: (40 commits) fs: update atime before I/O in generic_file_read_iter xfs: update atime before I/O in xfs_file_dio_aio_read ext2: fix possible integer truncation in ext2_iomap_begin xfs: log recovery tracepoints to track current lsn and buffer submission xfs: update metadata LSN in buffers during log recovery xfs: don't warn on buffers not being recovered due to LSN xfs: pass current lsn to log recovery buffer validation xfs: rework log recovery to submit buffers on LSN boundaries xfs: quiesce the filesystem after recovery on readonly mount xfs: remote attribute blocks aren't really userdata ext2: use iomap to implement DAX ext2: stop passing buffer_head to ext2_get_blocks xfs: use iomap to implement DAX xfs: refactor xfs_setfilesize xfs: take the ilock shared if possible in xfs_file_iomap_begin xfs: fix locking for DAX writes dax: provide an iomap based fault handler dax: provide an iomap based dax read/write path dax: don't pass buffer_head to copy_user_dax dax: don't pass buffer_head to dax_insert_mapping ...
Diffstat (limited to 'fs/ext2')
-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 c634874e..36bea5a 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 06af2f9..37e2be7 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 5efeefe..423cc01 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 303ae2b..1e72d42 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;
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