sort out blockdev_direct_IO variants
Move the call to vmtruncate to get rid of accessive blocks to the callers
in prepearation of the new truncate calling sequence. This was only done
for DIO_LOCKING filesystems, so the __blockdev_direct_IO_newtrunc variant
was not needed anyway. Get rid of blockdev_direct_IO_no_locking and
its _newtrunc variant while at it as just opencoding the two additional
paramters is shorted than the name suffix.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 99d6af8..65a0c26 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -172,9 +172,8 @@
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
- return blockdev_direct_IO_no_locking_newtrunc(rw, iocb, inode,
- I_BDEV(inode), iov, offset, nr_segs,
- blkdev_get_blocks, NULL);
+ return __blockdev_direct_IO(rw, iocb, inode, I_BDEV(inode), iov, offset,
+ nr_segs, blkdev_get_blocks, NULL, NULL, 0);
}
int __sync_blockdev(struct block_device *bdev, int wait)
diff --git a/fs/direct-io.c b/fs/direct-io.c
index a10cb91..51f270b 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -1136,8 +1136,27 @@
return ret;
}
+/*
+ * This is a library function for use by filesystem drivers.
+ *
+ * The locking rules are governed by the flags parameter:
+ * - if the flags value contains DIO_LOCKING we use a fancy locking
+ * scheme for dumb filesystems.
+ * For writes this function is called under i_mutex and returns with
+ * i_mutex held, for reads, i_mutex is not held on entry, but it is
+ * taken and dropped again before returning.
+ * For reads and writes i_alloc_sem is taken in shared mode and released
+ * on I/O completion (which may happen asynchronously after returning to
+ * the caller).
+ *
+ * - if the flags value does NOT contain DIO_LOCKING we don't use any
+ * internal locking but rather rely on the filesystem to synchronize
+ * direct I/O reads/writes versus each other and truncate.
+ * For reads and writes both i_mutex and i_alloc_sem are not held on
+ * entry and are never taken.
+ */
ssize_t
-__blockdev_direct_IO_newtrunc(int rw, struct kiocb *iocb, struct inode *inode,
+__blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
struct block_device *bdev, const struct iovec *iov, loff_t offset,
unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
dio_submit_t submit_io, int flags)
@@ -1233,57 +1252,4 @@
out:
return retval;
}
-EXPORT_SYMBOL(__blockdev_direct_IO_newtrunc);
-
-/*
- * This is a library function for use by filesystem drivers.
- *
- * The locking rules are governed by the flags parameter:
- * - if the flags value contains DIO_LOCKING we use a fancy locking
- * scheme for dumb filesystems.
- * For writes this function is called under i_mutex and returns with
- * i_mutex held, for reads, i_mutex is not held on entry, but it is
- * taken and dropped again before returning.
- * For reads and writes i_alloc_sem is taken in shared mode and released
- * on I/O completion (which may happen asynchronously after returning to
- * the caller).
- *
- * - if the flags value does NOT contain DIO_LOCKING we don't use any
- * internal locking but rather rely on the filesystem to synchronize
- * direct I/O reads/writes versus each other and truncate.
- * For reads and writes both i_mutex and i_alloc_sem are not held on
- * entry and are never taken.
- */
-ssize_t
-__blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
- struct block_device *bdev, const struct iovec *iov, loff_t offset,
- unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
- dio_submit_t submit_io, int flags)
-{
- ssize_t retval;
-
- retval = __blockdev_direct_IO_newtrunc(rw, iocb, inode, bdev, iov,
- offset, nr_segs, get_block, end_io, submit_io, flags);
- /*
- * In case of error extending write may have instantiated a few
- * blocks outside i_size. Trim these off again for DIO_LOCKING.
- * NOTE: DIO_NO_LOCK/DIO_OWN_LOCK callers have to handle this in
- * their own manner. This is a further example of where the old
- * truncate sequence is inadequate.
- *
- * NOTE: filesystems with their own locking have to handle this
- * on their own.
- */
- if (flags & DIO_LOCKING) {
- if (unlikely((rw & WRITE) && retval < 0)) {
- loff_t isize = i_size_read(inode);
- loff_t end = offset + iov_length(iov, nr_segs);
-
- if (end > isize)
- vmtruncate(inode, isize);
- }
- }
-
- return retval;
-}
EXPORT_SYMBOL(__blockdev_direct_IO);
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 3675088..f36e967 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -838,7 +838,7 @@
struct inode *inode = mapping->host;
ssize_t ret;
- ret = blockdev_direct_IO_newtrunc(rw, iocb, inode, inode->i_sb->s_bdev,
+ ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev,
iov, offset, nr_segs, ext2_get_block, NULL);
if (ret < 0 && (rw & WRITE))
ext2_write_failed(mapping, offset + iov_length(iov, nr_segs));
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 735f019..a66f3fe 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -1785,6 +1785,17 @@
ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
offset, nr_segs,
ext3_get_block, NULL);
+ /*
+ * In case of error extending write may have instantiated a few
+ * blocks outside i_size. Trim these off again.
+ */
+ if (unlikely((rw & WRITE) && ret < 0)) {
+ loff_t isize = i_size_read(inode);
+ loff_t end = offset + iov_length(iov, nr_segs);
+
+ if (end > isize)
+ vmtruncate(inode, isize);
+ }
if (ret == -ENOSPC && ext3_should_retry_alloc(inode->i_sb, &retries))
goto retry;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 0afc8c1..d6a7701 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3545,15 +3545,24 @@
retry:
if (rw == READ && ext4_should_dioread_nolock(inode))
- ret = blockdev_direct_IO_no_locking(rw, iocb, inode,
+ ret = __blockdev_direct_IO(rw, iocb, inode,
inode->i_sb->s_bdev, iov,
offset, nr_segs,
- ext4_get_block, NULL);
- else
+ ext4_get_block, NULL, NULL, 0);
+ else {
ret = blockdev_direct_IO(rw, iocb, inode,
inode->i_sb->s_bdev, iov,
offset, nr_segs,
ext4_get_block, NULL);
+
+ if (unlikely((rw & WRITE) && ret < 0)) {
+ loff_t isize = i_size_read(inode);
+ loff_t end = offset + iov_length(iov, nr_segs);
+
+ if (end > isize)
+ vmtruncate(inode, isize);
+ }
+ }
if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
goto retry;
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 7bf45ae..ffe7c6f 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -212,8 +212,8 @@
* FAT need to use the DIO_LOCKING for avoiding the race
* condition of fat_get_block() and ->truncate().
*/
- ret = blockdev_direct_IO_newtrunc(rw, iocb, inode, inode->i_sb->s_bdev,
- iov, offset, nr_segs, fat_get_block, NULL);
+ ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev,
+ iov, offset, nr_segs, fat_get_block, NULL);
if (ret < 0 && (rw & WRITE))
fat_write_failed(mapping, offset + iov_length(iov, nr_segs));
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 9f8b525..703000d 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -1047,9 +1047,9 @@
if (rv != 1)
goto out; /* dio not valid, fall back to buffered i/o */
- rv = blockdev_direct_IO_no_locking(rw, iocb, inode, inode->i_sb->s_bdev,
- iov, offset, nr_segs,
- gfs2_get_block_direct, NULL);
+ rv = __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
+ offset, nr_segs, gfs2_get_block_direct,
+ NULL, NULL, 0);
out:
gfs2_glock_dq_m(1, &gh);
gfs2_holder_uninit(&gh);
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 14f5cb1..07b2464 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -112,9 +112,24 @@
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
+ ssize_t ret;
- return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
+ ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
offset, nr_segs, hfs_get_block, NULL);
+
+ /*
+ * In case of error extending write may have instantiated a few
+ * blocks outside i_size. Trim these off again.
+ */
+ if (unlikely((rw & WRITE) && ret < 0)) {
+ loff_t isize = i_size_read(inode);
+ loff_t end = offset + iov_length(iov, nr_segs);
+
+ if (end > isize)
+ vmtruncate(inode, isize);
+ }
+
+ return ret;
}
static int hfs_writepages(struct address_space *mapping,
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index 9bbb829..4860217 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -105,9 +105,24 @@
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
+ ssize_t ret;
- return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
+ ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
offset, nr_segs, hfsplus_get_block, NULL);
+
+ /*
+ * In case of error extending write may have instantiated a few
+ * blocks outside i_size. Trim these off again.
+ */
+ if (unlikely((rw & WRITE) && ret < 0)) {
+ loff_t isize = i_size_read(inode);
+ loff_t end = offset + iov_length(iov, nr_segs);
+
+ if (end > isize)
+ vmtruncate(inode, isize);
+ }
+
+ return ret;
}
static int hfsplus_writepages(struct address_space *mapping,
diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
index ed9ba6f..79e6cda 100644
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c
@@ -317,9 +317,24 @@
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
+ ssize_t ret;
- return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
+ ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
offset, nr_segs, jfs_get_block, NULL);
+
+ /*
+ * In case of error extending write may have instantiated a few
+ * blocks outside i_size. Trim these off again.
+ */
+ if (unlikely((rw & WRITE) && ret < 0)) {
+ loff_t isize = i_size_read(inode);
+ loff_t end = offset + iov_length(iov, nr_segs);
+
+ if (end > isize)
+ vmtruncate(inode, isize);
+ }
+
+ return ret;
}
const struct address_space_operations jfs_aops = {
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 39e038a..1dd9e6a 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -237,6 +237,19 @@
/* Needs synchronization with the cleaner */
size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
offset, nr_segs, nilfs_get_block, NULL);
+
+ /*
+ * In case of error extending write may have instantiated a few
+ * blocks outside i_size. Trim these off again.
+ */
+ if (unlikely((rw & WRITE) && size < 0)) {
+ loff_t isize = i_size_read(inode);
+ loff_t end = offset + iov_length(iov, nr_segs);
+
+ if (end > isize)
+ vmtruncate(inode, isize);
+ }
+
return size;
}
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 96337a4..0de69c9 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -643,11 +643,10 @@
if (i_size_read(inode) <= offset)
return 0;
- ret = blockdev_direct_IO_no_locking(rw, iocb, inode,
- inode->i_sb->s_bdev, iov, offset,
- nr_segs,
- ocfs2_direct_IO_get_blocks,
- ocfs2_dio_end_io);
+ ret = __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev,
+ iov, offset, nr_segs,
+ ocfs2_direct_IO_get_blocks,
+ ocfs2_dio_end_io, NULL, 0);
mlog_exit(ret);
return ret;
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 6edac85..4c1fb54 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -3057,10 +3057,25 @@
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
+ ssize_t ret;
- return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
+ ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
offset, nr_segs,
reiserfs_get_blocks_direct_io, NULL);
+
+ /*
+ * In case of error extending write may have instantiated a few
+ * blocks outside i_size. Trim these off again.
+ */
+ if (unlikely((rw & WRITE) && ret < 0)) {
+ loff_t isize = i_size_read(inode);
+ loff_t end = offset + iov_length(iov, nr_segs);
+
+ if (end > isize)
+ vmtruncate(inode, isize);
+ }
+
+ return ret;
}
int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index d24e78f..7968d41 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -1478,17 +1478,17 @@
if (rw & WRITE) {
iocb->private = xfs_alloc_ioend(inode, IO_NEW);
- ret = blockdev_direct_IO_no_locking(rw, iocb, inode, bdev, iov,
- offset, nr_segs,
- xfs_get_blocks_direct,
- xfs_end_io_direct_write);
+ ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov,
+ offset, nr_segs,
+ xfs_get_blocks_direct,
+ xfs_end_io_direct_write, NULL, 0);
if (ret != -EIOCBQUEUED && iocb->private)
xfs_destroy_ioend(iocb->private);
} else {
- ret = blockdev_direct_IO_no_locking(rw, iocb, inode, bdev, iov,
- offset, nr_segs,
- xfs_get_blocks_direct,
- NULL);
+ ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov,
+ offset, nr_segs,
+ xfs_get_blocks_direct,
+ NULL, NULL, 0);
}
return ret;