--- /dev/null
+/*
+ * Copyright (C) 2007 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef __BTRFS_I__
+#define __BTRFS_I__
+
+#include <linux/hash.h>
+#include "extent_map.h"
+#include "extent_io.h"
+#include "ordered-data.h"
+#include "delayed-inode.h"
+
+/*
+ * ordered_data_close is set by truncate when a file that used
+ * to have good data has been truncated to zero. When it is set
+ * the btrfs file release call will add this inode to the
+ * ordered operations list so that we make sure to flush out any
+ * new data the application may have written before commit.
+ */
+#define BTRFS_INODE_ORDERED_DATA_CLOSE 0
+#define BTRFS_INODE_ORPHAN_META_RESERVED 1
+#define BTRFS_INODE_DUMMY 2
+#define BTRFS_INODE_IN_DEFRAG 3
+#define BTRFS_INODE_DELALLOC_META_RESERVED 4
+#define BTRFS_INODE_HAS_ORPHAN_ITEM 5
+#define BTRFS_INODE_HAS_ASYNC_EXTENT 6
+#define BTRFS_INODE_NEEDS_FULL_SYNC 7
+#define BTRFS_INODE_COPY_EVERYTHING 8
+#define BTRFS_INODE_IN_DELALLOC_LIST 9
+#define BTRFS_INODE_READDIO_NEED_LOCK 10
+#define BTRFS_INODE_HAS_PROPS 11
+/*
+ * The following 3 bits are meant only for the btree inode.
+ * When any of them is set, it means an error happened while writing an
+ * extent buffer belonging to:
+ * 1) a non-log btree
+ * 2) a log btree and first log sub-transaction
+ * 3) a log btree and second log sub-transaction
+ */
+#define BTRFS_INODE_BTREE_ERR 12
+#define BTRFS_INODE_BTREE_LOG1_ERR 13
+#define BTRFS_INODE_BTREE_LOG2_ERR 14
+
+/* in memory btrfs inode */
+struct btrfs_inode {
+ /* which subvolume this inode belongs to */
+ struct btrfs_root *root;
+
+ /* key used to find this inode on disk. This is used by the code
+ * to read in roots of subvolumes
+ */
+ struct btrfs_key location;
+
+ /*
+ * Lock for counters and all fields used to determine if the inode is in
+ * the log or not (last_trans, last_sub_trans, last_log_commit,
+ * logged_trans).
+ */
+ spinlock_t lock;
+
+ /* the extent_tree has caches of all the extent mappings to disk */
+ struct extent_map_tree extent_tree;
+
+ /* the io_tree does range state (DIRTY, LOCKED etc) */
+ struct extent_io_tree io_tree;
+
+ /* special utility tree used to record which mirrors have already been
+ * tried when checksums fail for a given block
+ */
+ struct extent_io_tree io_failure_tree;
+
+ /* held while logging the inode in tree-log.c */
+ struct mutex log_mutex;
+
+ /* held while doing delalloc reservations */
+ struct mutex delalloc_mutex;
+
+ /* used to order data wrt metadata */
+ struct btrfs_ordered_inode_tree ordered_tree;
+
+ /* list of all the delalloc inodes in the FS. There are times we need
+ * to write all the delalloc pages to disk, and this list is used
+ * to walk them all.
+ */
+ struct list_head delalloc_inodes;
+
+ /* node for the red-black tree that links inodes in subvolume root */
+ struct rb_node rb_node;
+
+ unsigned long runtime_flags;
+
+ /* Keep track of who's O_SYNC/fsyncing currently */
+ atomic_t sync_writers;
+
+ /* full 64 bit generation number, struct vfs_inode doesn't have a big
+ * enough field for this.
+ */
+ u64 generation;
+
+ /*
+ * transid of the trans_handle that last modified this inode
+ */
+ u64 last_trans;
+
+ /*
+ * transid that last logged this inode
+ */
+ u64 logged_trans;
+
+ /*
+ * log transid when this inode was last modified
+ */
+ int last_sub_trans;
+
+ /* a local copy of root's last_log_commit */
+ int last_log_commit;
+
+ /* total number of bytes pending delalloc, used by stat to calc the
+ * real block usage of the file
+ */
+ u64 delalloc_bytes;
+
+ /*
+ * total number of bytes pending defrag, used by stat to check whether
+ * it needs COW.
+ */
+ u64 defrag_bytes;
+
+ /*
+ * the size of the file stored in the metadata on disk. data=ordered
+ * means the in-memory i_size might be larger than the size on disk
+ * because not all the blocks are written yet.
+ */
+ u64 disk_i_size;
+
+ /*
+ * if this is a directory then index_cnt is the counter for the index
+ * number for new files that are created
+ */
+ u64 index_cnt;
+
+ /* Cache the directory index number to speed the dir/file remove */
+ u64 dir_index;
+
+ /* the fsync log has some corner cases that mean we have to check
+ * directories to see if any unlinks have been done before
+ * the directory was logged. See tree-log.c for all the
+ * details
+ */
+ u64 last_unlink_trans;
+
+ /*
+ * Number of bytes outstanding that are going to need csums. This is
+ * used in ENOSPC accounting.
+ */
+ u64 csum_bytes;
+
+ /* flags field from the on disk inode */
+ u32 flags;
+
+ /*
+ * Counters to keep track of the number of extent item's we may use due
+ * to delalloc and such. outstanding_extents is the number of extent
+ * items we think we'll end up using, and reserved_extents is the number
+ * of extent items we've reserved metadata for.
+ */
+ unsigned outstanding_extents;
+ unsigned reserved_extents;
+
+ /*
+ * always compress this one file
+ */
+ unsigned force_compress;
+
+ struct btrfs_delayed_node *delayed_node;
+
+ /* File creation time. */
+ struct timespec i_otime;
+
+ struct inode vfs_inode;
+};
+
+extern unsigned char btrfs_filetype_table[];
+
+static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
+{
+ return container_of(inode, struct btrfs_inode, vfs_inode);
+}
+
+static inline unsigned long btrfs_inode_hash(u64 objectid,
+ const struct btrfs_root *root)
+{
+ u64 h = objectid ^ (root->objectid * GOLDEN_RATIO_PRIME);
+
+#if BITS_PER_LONG == 32
+ h = (h >> 32) ^ (h & 0xffffffff);
+#endif
+
+ return (unsigned long)h;
+}
+
+static inline void btrfs_insert_inode_hash(struct inode *inode)
+{
+ unsigned long h = btrfs_inode_hash(inode->i_ino, BTRFS_I(inode)->root);
+
+ __insert_inode_hash(inode, h);
+}
+
+static inline u64 btrfs_ino(struct inode *inode)
+{
+ u64 ino = BTRFS_I(inode)->location.objectid;
+
+ /*
+ * !ino: btree_inode
+ * type == BTRFS_ROOT_ITEM_KEY: subvol dir
+ */
+ if (!ino || BTRFS_I(inode)->location.type == BTRFS_ROOT_ITEM_KEY)
+ ino = inode->i_ino;
+ return ino;
+}
+
+static inline void btrfs_i_size_write(struct inode *inode, u64 size)
+{
+ i_size_write(inode, size);
+ BTRFS_I(inode)->disk_i_size = size;
+}
+
+static inline bool btrfs_is_free_space_inode(struct inode *inode)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+
+ if (root == root->fs_info->tree_root &&
+ btrfs_ino(inode) != BTRFS_BTREE_INODE_OBJECTID)
+ return true;
+ if (BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID)
+ return true;
+ return false;
+}
+
+static inline int btrfs_inode_in_log(struct inode *inode, u64 generation)
+{
+ int ret = 0;
+
+ spin_lock(&BTRFS_I(inode)->lock);
+ if (BTRFS_I(inode)->logged_trans == generation &&
+ BTRFS_I(inode)->last_sub_trans <=
+ BTRFS_I(inode)->last_log_commit &&
+ BTRFS_I(inode)->last_sub_trans <=
+ BTRFS_I(inode)->root->last_log_commit) {
+ /*
+ * After a ranged fsync we might have left some extent maps
+ * (that fall outside the fsync's range). So return false
+ * here if the list isn't empty, to make sure btrfs_log_inode()
+ * will be called and process those extent maps.
+ */
+ smp_mb();
+ if (list_empty(&BTRFS_I(inode)->extent_tree.modified_extents))
+ ret = 1;
+ }
+ spin_unlock(&BTRFS_I(inode)->lock);
+ return ret;
+}
+
+#define BTRFS_DIO_ORIG_BIO_SUBMITTED 0x1
+
+struct btrfs_dio_private {
+ struct inode *inode;
+ unsigned long flags;
+ u64 logical_offset;
+ u64 disk_bytenr;
+ u64 bytes;
+ void *private;
+
+ /* number of bios pending for this dio */
+ atomic_t pending_bios;
+
+ /* IO errors */
+ int errors;
+
+ /* orig_bio is our btrfs_io_bio */
+ struct bio *orig_bio;
+
+ /* dio_bio came from fs/direct-io.c */
+ struct bio *dio_bio;
+
+ /*
+ * The original bio may be splited to several sub-bios, this is
+ * done during endio of sub-bios
+ */
+ int (*subio_endio)(struct inode *, struct btrfs_io_bio *, int);
+};
+
+/*
+ * Disable DIO read nolock optimization, so new dio readers will be forced
+ * to grab i_mutex. It is used to avoid the endless truncate due to
+ * nonlocked dio read.
+ */
+static inline void btrfs_inode_block_unlocked_dio(struct inode *inode)
+{
+ set_bit(BTRFS_INODE_READDIO_NEED_LOCK, &BTRFS_I(inode)->runtime_flags);
+ smp_mb();
+}
+
+static inline void btrfs_inode_resume_unlocked_dio(struct inode *inode)
+{
+ smp_mb__before_atomic();
+ clear_bit(BTRFS_INODE_READDIO_NEED_LOCK,
+ &BTRFS_I(inode)->runtime_flags);
+}
+
+bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end);
+
+#endif
Code Review / kvmfornfv.git / blobdiff