| /* |
| * ext4_jbd2.h |
| * |
| * Written by Stephen C. Tweedie <sct@redhat.com>, 1999 |
| * |
| * Copyright 1998--1999 Red Hat corp --- All Rights Reserved |
| * |
| * This file is part of the Linux kernel and is made available under |
| * the terms of the GNU General Public License, version 2, or at your |
| * option, any later version, incorporated herein by reference. |
| * |
| * Ext4-specific journaling extensions. |
| */ |
| |
| #ifndef _EXT4_JBD2_H |
| #define _EXT4_JBD2_H |
| |
| #include <linux/fs.h> |
| #include <linux/jbd2.h> |
| #include "ext4.h" |
| |
| #define EXT4_JOURNAL(inode) (EXT4_SB((inode)->i_sb)->s_journal) |
| |
| /* Define the number of blocks we need to account to a transaction to |
| * modify one block of data. |
| * |
| * We may have to touch one inode, one bitmap buffer, up to three |
| * indirection blocks, the group and superblock summaries, and the data |
| * block to complete the transaction. |
| * |
| * For extents-enabled fs we may have to allocate and modify up to |
| * 5 levels of tree + root which are stored in the inode. */ |
| |
| #define EXT4_SINGLEDATA_TRANS_BLOCKS(sb) \ |
| (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS) \ |
| ? 27U : 8U) |
| |
| /* Extended attribute operations touch at most two data buffers, |
| * two bitmap buffers, and two group summaries, in addition to the inode |
| * and the superblock, which are already accounted for. */ |
| |
| #define EXT4_XATTR_TRANS_BLOCKS 6U |
| |
| /* Define the minimum size for a transaction which modifies data. This |
| * needs to take into account the fact that we may end up modifying two |
| * quota files too (one for the group, one for the user quota). The |
| * superblock only gets updated once, of course, so don't bother |
| * counting that again for the quota updates. */ |
| |
| #define EXT4_DATA_TRANS_BLOCKS(sb) (EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + \ |
| EXT4_XATTR_TRANS_BLOCKS - 2 + \ |
| EXT4_MAXQUOTAS_TRANS_BLOCKS(sb)) |
| |
| /* |
| * Define the number of metadata blocks we need to account to modify data. |
| * |
| * This include super block, inode block, quota blocks and xattr blocks |
| */ |
| #define EXT4_META_TRANS_BLOCKS(sb) (EXT4_XATTR_TRANS_BLOCKS + \ |
| EXT4_MAXQUOTAS_TRANS_BLOCKS(sb)) |
| |
| /* Delete operations potentially hit one directory's namespace plus an |
| * entire inode, plus arbitrary amounts of bitmap/indirection data. Be |
| * generous. We can grow the delete transaction later if necessary. */ |
| |
| #define EXT4_DELETE_TRANS_BLOCKS(sb) (2 * EXT4_DATA_TRANS_BLOCKS(sb) + 64) |
| |
| /* Define an arbitrary limit for the amount of data we will anticipate |
| * writing to any given transaction. For unbounded transactions such as |
| * write(2) and truncate(2) we can write more than this, but we always |
| * start off at the maximum transaction size and grow the transaction |
| * optimistically as we go. */ |
| |
| #define EXT4_MAX_TRANS_DATA 64U |
| |
| /* We break up a large truncate or write transaction once the handle's |
| * buffer credits gets this low, we need either to extend the |
| * transaction or to start a new one. Reserve enough space here for |
| * inode, bitmap, superblock, group and indirection updates for at least |
| * one block, plus two quota updates. Quota allocations are not |
| * needed. */ |
| |
| #define EXT4_RESERVE_TRANS_BLOCKS 12U |
| |
| #define EXT4_INDEX_EXTRA_TRANS_BLOCKS 8 |
| |
| #ifdef CONFIG_QUOTA |
| /* Amount of blocks needed for quota update - we know that the structure was |
| * allocated so we need to update only data block */ |
| #define EXT4_QUOTA_TRANS_BLOCKS(sb) ((test_opt(sb, QUOTA) ||\ |
| EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) ?\ |
| 1 : 0) |
| /* Amount of blocks needed for quota insert/delete - we do some block writes |
| * but inode, sb and group updates are done only once */ |
| #define EXT4_QUOTA_INIT_BLOCKS(sb) ((test_opt(sb, QUOTA) ||\ |
| EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) ?\ |
| (DQUOT_INIT_ALLOC*(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)\ |
| +3+DQUOT_INIT_REWRITE) : 0) |
| |
| #define EXT4_QUOTA_DEL_BLOCKS(sb) ((test_opt(sb, QUOTA) ||\ |
| EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) ?\ |
| (DQUOT_DEL_ALLOC*(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)\ |
| +3+DQUOT_DEL_REWRITE) : 0) |
| #else |
| #define EXT4_QUOTA_TRANS_BLOCKS(sb) 0 |
| #define EXT4_QUOTA_INIT_BLOCKS(sb) 0 |
| #define EXT4_QUOTA_DEL_BLOCKS(sb) 0 |
| #endif |
| #define EXT4_MAXQUOTAS_TRANS_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_TRANS_BLOCKS(sb)) |
| #define EXT4_MAXQUOTAS_INIT_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_INIT_BLOCKS(sb)) |
| #define EXT4_MAXQUOTAS_DEL_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_DEL_BLOCKS(sb)) |
| |
| /** |
| * struct ext4_journal_cb_entry - Base structure for callback information. |
| * |
| * This struct is a 'seed' structure for a using with your own callback |
| * structs. If you are using callbacks you must allocate one of these |
| * or another struct of your own definition which has this struct |
| * as it's first element and pass it to ext4_journal_callback_add(). |
| */ |
| struct ext4_journal_cb_entry { |
| /* list information for other callbacks attached to the same handle */ |
| struct list_head jce_list; |
| |
| /* Function to call with this callback structure */ |
| void (*jce_func)(struct super_block *sb, |
| struct ext4_journal_cb_entry *jce, int error); |
| |
| /* user data goes here */ |
| }; |
| |
| /** |
| * ext4_journal_callback_add: add a function to call after transaction commit |
| * @handle: active journal transaction handle to register callback on |
| * @func: callback function to call after the transaction has committed: |
| * @sb: superblock of current filesystem for transaction |
| * @jce: returned journal callback data |
| * @rc: journal state at commit (0 = transaction committed properly) |
| * @jce: journal callback data (internal and function private data struct) |
| * |
| * The registered function will be called in the context of the journal thread |
| * after the transaction for which the handle was created has completed. |
| * |
| * No locks are held when the callback function is called, so it is safe to |
| * call blocking functions from within the callback, but the callback should |
| * not block or run for too long, or the filesystem will be blocked waiting for |
| * the next transaction to commit. No journaling functions can be used, or |
| * there is a risk of deadlock. |
| * |
| * There is no guaranteed calling order of multiple registered callbacks on |
| * the same transaction. |
| */ |
| static inline void ext4_journal_callback_add(handle_t *handle, |
| void (*func)(struct super_block *sb, |
| struct ext4_journal_cb_entry *jce, |
| int rc), |
| struct ext4_journal_cb_entry *jce) |
| { |
| struct ext4_sb_info *sbi = |
| EXT4_SB(handle->h_transaction->t_journal->j_private); |
| |
| /* Add the jce to transaction's private list */ |
| jce->jce_func = func; |
| spin_lock(&sbi->s_md_lock); |
| list_add_tail(&jce->jce_list, &handle->h_transaction->t_private_list); |
| spin_unlock(&sbi->s_md_lock); |
| } |
| |
| /** |
| * ext4_journal_callback_del: delete a registered callback |
| * @handle: active journal transaction handle on which callback was registered |
| * @jce: registered journal callback entry to unregister |
| */ |
| static inline void ext4_journal_callback_del(handle_t *handle, |
| struct ext4_journal_cb_entry *jce) |
| { |
| struct ext4_sb_info *sbi = |
| EXT4_SB(handle->h_transaction->t_journal->j_private); |
| |
| spin_lock(&sbi->s_md_lock); |
| list_del_init(&jce->jce_list); |
| spin_unlock(&sbi->s_md_lock); |
| } |
| |
| int |
| ext4_mark_iloc_dirty(handle_t *handle, |
| struct inode *inode, |
| struct ext4_iloc *iloc); |
| |
| /* |
| * On success, We end up with an outstanding reference count against |
| * iloc->bh. This _must_ be cleaned up later. |
| */ |
| |
| int ext4_reserve_inode_write(handle_t *handle, struct inode *inode, |
| struct ext4_iloc *iloc); |
| |
| int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode); |
| |
| /* |
| * Wrapper functions with which ext4 calls into JBD. |
| */ |
| void ext4_journal_abort_handle(const char *caller, unsigned int line, |
| const char *err_fn, |
| struct buffer_head *bh, handle_t *handle, int err); |
| |
| int __ext4_journal_get_write_access(const char *where, unsigned int line, |
| handle_t *handle, struct buffer_head *bh); |
| |
| int __ext4_forget(const char *where, unsigned int line, handle_t *handle, |
| int is_metadata, struct inode *inode, |
| struct buffer_head *bh, ext4_fsblk_t blocknr); |
| |
| int __ext4_journal_get_create_access(const char *where, unsigned int line, |
| handle_t *handle, struct buffer_head *bh); |
| |
| int __ext4_handle_dirty_metadata(const char *where, unsigned int line, |
| handle_t *handle, struct inode *inode, |
| struct buffer_head *bh); |
| |
| int __ext4_handle_dirty_super(const char *where, unsigned int line, |
| handle_t *handle, struct super_block *sb, |
| int now); |
| |
| #define ext4_journal_get_write_access(handle, bh) \ |
| __ext4_journal_get_write_access(__func__, __LINE__, (handle), (bh)) |
| #define ext4_forget(handle, is_metadata, inode, bh, block_nr) \ |
| __ext4_forget(__func__, __LINE__, (handle), (is_metadata), (inode), \ |
| (bh), (block_nr)) |
| #define ext4_journal_get_create_access(handle, bh) \ |
| __ext4_journal_get_create_access(__func__, __LINE__, (handle), (bh)) |
| #define ext4_handle_dirty_metadata(handle, inode, bh) \ |
| __ext4_handle_dirty_metadata(__func__, __LINE__, (handle), (inode), \ |
| (bh)) |
| #define ext4_handle_dirty_super_now(handle, sb) \ |
| __ext4_handle_dirty_super(__func__, __LINE__, (handle), (sb), 1) |
| #define ext4_handle_dirty_super(handle, sb) \ |
| __ext4_handle_dirty_super(__func__, __LINE__, (handle), (sb), 0) |
| |
| handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks); |
| int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle); |
| |
| #define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096) |
| |
| /* Note: Do not use this for NULL handles. This is only to determine if |
| * a properly allocated handle is using a journal or not. */ |
| static inline int ext4_handle_valid(handle_t *handle) |
| { |
| if ((unsigned long)handle < EXT4_NOJOURNAL_MAX_REF_COUNT) |
| return 0; |
| return 1; |
| } |
| |
| static inline void ext4_handle_sync(handle_t *handle) |
| { |
| if (ext4_handle_valid(handle)) |
| handle->h_sync = 1; |
| } |
| |
| static inline void ext4_handle_release_buffer(handle_t *handle, |
| struct buffer_head *bh) |
| { |
| if (ext4_handle_valid(handle)) |
| jbd2_journal_release_buffer(handle, bh); |
| } |
| |
| static inline int ext4_handle_is_aborted(handle_t *handle) |
| { |
| if (ext4_handle_valid(handle)) |
| return is_handle_aborted(handle); |
| return 0; |
| } |
| |
| static inline int ext4_handle_has_enough_credits(handle_t *handle, int needed) |
| { |
| if (ext4_handle_valid(handle) && handle->h_buffer_credits < needed) |
| return 0; |
| return 1; |
| } |
| |
| static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks) |
| { |
| return ext4_journal_start_sb(inode->i_sb, nblocks); |
| } |
| |
| #define ext4_journal_stop(handle) \ |
| __ext4_journal_stop(__func__, __LINE__, (handle)) |
| |
| static inline handle_t *ext4_journal_current_handle(void) |
| { |
| return journal_current_handle(); |
| } |
| |
| static inline int ext4_journal_extend(handle_t *handle, int nblocks) |
| { |
| if (ext4_handle_valid(handle)) |
| return jbd2_journal_extend(handle, nblocks); |
| return 0; |
| } |
| |
| static inline int ext4_journal_restart(handle_t *handle, int nblocks) |
| { |
| if (ext4_handle_valid(handle)) |
| return jbd2_journal_restart(handle, nblocks); |
| return 0; |
| } |
| |
| static inline int ext4_journal_blocks_per_page(struct inode *inode) |
| { |
| if (EXT4_JOURNAL(inode) != NULL) |
| return jbd2_journal_blocks_per_page(inode); |
| return 0; |
| } |
| |
| static inline int ext4_journal_force_commit(journal_t *journal) |
| { |
| if (journal) |
| return jbd2_journal_force_commit(journal); |
| return 0; |
| } |
| |
| static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode) |
| { |
| if (ext4_handle_valid(handle)) |
| return jbd2_journal_file_inode(handle, EXT4_I(inode)->jinode); |
| return 0; |
| } |
| |
| static inline void ext4_update_inode_fsync_trans(handle_t *handle, |
| struct inode *inode, |
| int datasync) |
| { |
| struct ext4_inode_info *ei = EXT4_I(inode); |
| |
| if (ext4_handle_valid(handle)) { |
| ei->i_sync_tid = handle->h_transaction->t_tid; |
| if (datasync) |
| ei->i_datasync_tid = handle->h_transaction->t_tid; |
| } |
| } |
| |
| /* super.c */ |
| int ext4_force_commit(struct super_block *sb); |
| |
| /* |
| * Ext4 inode journal modes |
| */ |
| #define EXT4_INODE_JOURNAL_DATA_MODE 0x01 /* journal data mode */ |
| #define EXT4_INODE_ORDERED_DATA_MODE 0x02 /* ordered data mode */ |
| #define EXT4_INODE_WRITEBACK_DATA_MODE 0x04 /* writeback data mode */ |
| |
| static inline int ext4_inode_journal_mode(struct inode *inode) |
| { |
| if (EXT4_JOURNAL(inode) == NULL) |
| return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */ |
| /* We do not support data journalling with delayed allocation */ |
| if (!S_ISREG(inode->i_mode) || |
| test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) |
| return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */ |
| if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA) && |
| !test_opt(inode->i_sb, DELALLOC)) |
| return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */ |
| if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) |
| return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */ |
| if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) |
| return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */ |
| else |
| BUG(); |
| } |
| |
| static inline int ext4_should_journal_data(struct inode *inode) |
| { |
| return ext4_inode_journal_mode(inode) & EXT4_INODE_JOURNAL_DATA_MODE; |
| } |
| |
| static inline int ext4_should_order_data(struct inode *inode) |
| { |
| return ext4_inode_journal_mode(inode) & EXT4_INODE_ORDERED_DATA_MODE; |
| } |
| |
| static inline int ext4_should_writeback_data(struct inode *inode) |
| { |
| return ext4_inode_journal_mode(inode) & EXT4_INODE_WRITEBACK_DATA_MODE; |
| } |
| |
| /* |
| * This function controls whether or not we should try to go down the |
| * dioread_nolock code paths, which makes it safe to avoid taking |
| * i_mutex for direct I/O reads. This only works for extent-based |
| * files, and it doesn't work if data journaling is enabled, since the |
| * dioread_nolock code uses b_private to pass information back to the |
| * I/O completion handler, and this conflicts with the jbd's use of |
| * b_private. |
| */ |
| static inline int ext4_should_dioread_nolock(struct inode *inode) |
| { |
| if (!test_opt(inode->i_sb, DIOREAD_NOLOCK)) |
| return 0; |
| if (!S_ISREG(inode->i_mode)) |
| return 0; |
| if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
| return 0; |
| if (ext4_should_journal_data(inode)) |
| return 0; |
| return 1; |
| } |
| |
| #endif /* _EXT4_JBD2_H */ |