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btrfs: allocate dio_data on stack
Make use of the new iomap_iter->private field to avoid a memory allocation per iomap range. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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parent
786f847f43
commit
491a6d0118
1 changed files with 11 additions and 23 deletions
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@ -7546,10 +7546,11 @@ static int btrfs_dio_iomap_begin(struct inode *inode, loff_t start,
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loff_t length, unsigned int flags, struct iomap *iomap,
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loff_t length, unsigned int flags, struct iomap *iomap,
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struct iomap *srcmap)
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struct iomap *srcmap)
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{
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{
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struct iomap_iter *iter = container_of(iomap, struct iomap_iter, iomap);
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struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
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struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
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struct extent_map *em;
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struct extent_map *em;
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struct extent_state *cached_state = NULL;
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struct extent_state *cached_state = NULL;
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struct btrfs_dio_data *dio_data = NULL;
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struct btrfs_dio_data *dio_data = iter->private;
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u64 lockstart, lockend;
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u64 lockstart, lockend;
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const bool write = !!(flags & IOMAP_WRITE);
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const bool write = !!(flags & IOMAP_WRITE);
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int ret = 0;
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int ret = 0;
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@ -7595,17 +7596,7 @@ static int btrfs_dio_iomap_begin(struct inode *inode, loff_t start,
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}
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}
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}
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}
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if (flags & IOMAP_NOWAIT) {
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memset(dio_data, 0, sizeof(*dio_data));
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dio_data = kzalloc(sizeof(*dio_data), GFP_NOWAIT);
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if (!dio_data)
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return -EAGAIN;
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} else {
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dio_data = kzalloc(sizeof(*dio_data), GFP_NOFS);
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if (!dio_data)
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return -ENOMEM;
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}
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iomap->private = dio_data;
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/*
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/*
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* We always try to allocate data space and must do it before locking
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* We always try to allocate data space and must do it before locking
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@ -7769,23 +7760,22 @@ static int btrfs_dio_iomap_begin(struct inode *inode, loff_t start,
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extent_changeset_free(dio_data->data_reserved);
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extent_changeset_free(dio_data->data_reserved);
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}
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}
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kfree(dio_data);
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return ret;
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return ret;
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}
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}
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static int btrfs_dio_iomap_end(struct inode *inode, loff_t pos, loff_t length,
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static int btrfs_dio_iomap_end(struct inode *inode, loff_t pos, loff_t length,
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ssize_t written, unsigned int flags, struct iomap *iomap)
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ssize_t written, unsigned int flags, struct iomap *iomap)
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{
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{
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int ret = 0;
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struct iomap_iter *iter = container_of(iomap, struct iomap_iter, iomap);
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struct btrfs_dio_data *dio_data = iomap->private;
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struct btrfs_dio_data *dio_data = iter->private;
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size_t submitted = dio_data->submitted;
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size_t submitted = dio_data->submitted;
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const bool write = !!(flags & IOMAP_WRITE);
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const bool write = !!(flags & IOMAP_WRITE);
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int ret = 0;
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if (!write && (iomap->type == IOMAP_HOLE)) {
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if (!write && (iomap->type == IOMAP_HOLE)) {
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/* If reading from a hole, unlock and return */
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/* If reading from a hole, unlock and return */
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unlock_extent(&BTRFS_I(inode)->io_tree, pos, pos + length - 1);
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unlock_extent(&BTRFS_I(inode)->io_tree, pos, pos + length - 1);
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goto out;
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return 0;
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}
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}
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if (submitted < length) {
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if (submitted < length) {
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@ -7802,10 +7792,6 @@ static int btrfs_dio_iomap_end(struct inode *inode, loff_t pos, loff_t length,
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if (write)
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if (write)
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extent_changeset_free(dio_data->data_reserved);
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extent_changeset_free(dio_data->data_reserved);
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out:
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kfree(dio_data);
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iomap->private = NULL;
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return ret;
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return ret;
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}
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}
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@ -8041,7 +8027,7 @@ static void btrfs_submit_direct(const struct iomap_iter *iter,
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int ret;
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int ret;
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blk_status_t status;
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blk_status_t status;
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struct btrfs_io_geometry geom;
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struct btrfs_io_geometry geom;
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struct btrfs_dio_data *dio_data = iter->iomap.private;
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struct btrfs_dio_data *dio_data = iter->private;
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struct extent_map *em = NULL;
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struct extent_map *em = NULL;
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dip = btrfs_create_dio_private(dio_bio, inode, file_offset);
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dip = btrfs_create_dio_private(dio_bio, inode, file_offset);
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@ -8166,8 +8152,10 @@ static const struct iomap_dio_ops btrfs_dio_ops = {
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ssize_t btrfs_dio_rw(struct kiocb *iocb, struct iov_iter *iter, size_t done_before)
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ssize_t btrfs_dio_rw(struct kiocb *iocb, struct iov_iter *iter, size_t done_before)
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{
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{
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struct btrfs_dio_data data;
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return iomap_dio_rw(iocb, iter, &btrfs_dio_iomap_ops, &btrfs_dio_ops,
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return iomap_dio_rw(iocb, iter, &btrfs_dio_iomap_ops, &btrfs_dio_ops,
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IOMAP_DIO_PARTIAL, NULL, done_before);
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IOMAP_DIO_PARTIAL, &data, done_before);
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}
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}
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static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
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static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
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