diff options
Diffstat (limited to 'fs/reiserfs/file.c')
| -rw-r--r-- | fs/reiserfs/file.c | 2564 |
1 files changed, 1362 insertions, 1202 deletions
diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c index 12e91209544e..c9f178fb494f 100644 --- a/fs/reiserfs/file.c +++ b/fs/reiserfs/file.c @@ -2,7 +2,6 @@ * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README */ - #include <linux/time.h> #include <linux/reiserfs_fs.h> #include <linux/reiserfs_acl.h> @@ -31,82 +30,84 @@ ** We use reiserfs_truncate_file to pack the tail, since it already has ** all the conditions coded. */ -static int reiserfs_file_release (struct inode * inode, struct file * filp) +static int reiserfs_file_release(struct inode *inode, struct file *filp) { - struct reiserfs_transaction_handle th ; - int err; - int jbegin_failure = 0; + struct reiserfs_transaction_handle th; + int err; + int jbegin_failure = 0; - if (!S_ISREG (inode->i_mode)) - BUG (); + if (!S_ISREG(inode->i_mode)) + BUG(); - /* fast out for when nothing needs to be done */ - if ((atomic_read(&inode->i_count) > 1 || - !(REISERFS_I(inode)->i_flags & i_pack_on_close_mask) || - !tail_has_to_be_packed(inode)) && - REISERFS_I(inode)->i_prealloc_count <= 0) { - return 0; - } - - reiserfs_write_lock(inode->i_sb); - down (&inode->i_sem); - /* freeing preallocation only involves relogging blocks that - * are already in the current transaction. preallocation gets - * freed at the end of each transaction, so it is impossible for - * us to log any additional blocks (including quota blocks) - */ - err = journal_begin(&th, inode->i_sb, 1); - if (err) { - /* uh oh, we can't allow the inode to go away while there - * is still preallocation blocks pending. Try to join the - * aborted transaction - */ - jbegin_failure = err; - err = journal_join_abort(&th, inode->i_sb, 1); + /* fast out for when nothing needs to be done */ + if ((atomic_read(&inode->i_count) > 1 || + !(REISERFS_I(inode)->i_flags & i_pack_on_close_mask) || + !tail_has_to_be_packed(inode)) && + REISERFS_I(inode)->i_prealloc_count <= 0) { + return 0; + } + reiserfs_write_lock(inode->i_sb); + down(&inode->i_sem); + /* freeing preallocation only involves relogging blocks that + * are already in the current transaction. preallocation gets + * freed at the end of each transaction, so it is impossible for + * us to log any additional blocks (including quota blocks) + */ + err = journal_begin(&th, inode->i_sb, 1); if (err) { - /* hmpf, our choices here aren't good. We can pin the inode - * which will disallow unmount from every happening, we can - * do nothing, which will corrupt random memory on unmount, - * or we can forcibly remove the file from the preallocation - * list, which will leak blocks on disk. Lets pin the inode - * and let the admin know what is going on. - */ - igrab(inode); - reiserfs_warning(inode->i_sb, "pinning inode %lu because the " - "preallocation can't be freed"); - goto out; + /* uh oh, we can't allow the inode to go away while there + * is still preallocation blocks pending. Try to join the + * aborted transaction + */ + jbegin_failure = err; + err = journal_join_abort(&th, inode->i_sb, 1); + + if (err) { + /* hmpf, our choices here aren't good. We can pin the inode + * which will disallow unmount from every happening, we can + * do nothing, which will corrupt random memory on unmount, + * or we can forcibly remove the file from the preallocation + * list, which will leak blocks on disk. Lets pin the inode + * and let the admin know what is going on. + */ + igrab(inode); + reiserfs_warning(inode->i_sb, + "pinning inode %lu because the " + "preallocation can't be freed"); + goto out; + } } - } - reiserfs_update_inode_transaction(inode) ; + reiserfs_update_inode_transaction(inode); #ifdef REISERFS_PREALLOCATE - reiserfs_discard_prealloc (&th, inode); + reiserfs_discard_prealloc(&th, inode); #endif - err = journal_end(&th, inode->i_sb, 1); - - /* copy back the error code from journal_begin */ - if (!err) - err = jbegin_failure; - - if (!err && atomic_read(&inode->i_count) <= 1 && - (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) && - tail_has_to_be_packed (inode)) { - /* if regular file is released by last holder and it has been - appended (we append by unformatted node only) or its direct - item(s) had to be converted, then it may have to be - indirect2direct converted */ - err = reiserfs_truncate_file(inode, 0) ; - } -out: - up (&inode->i_sem); - reiserfs_write_unlock(inode->i_sb); - return err; + err = journal_end(&th, inode->i_sb, 1); + + /* copy back the error code from journal_begin */ + if (!err) + err = jbegin_failure; + + if (!err && atomic_read(&inode->i_count) <= 1 && + (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) && + tail_has_to_be_packed(inode)) { + /* if regular file is released by last holder and it has been + appended (we append by unformatted node only) or its direct + item(s) had to be converted, then it may have to be + indirect2direct converted */ + err = reiserfs_truncate_file(inode, 0); + } + out: + up(&inode->i_sem); + reiserfs_write_unlock(inode->i_sb); + return err; } -static void reiserfs_vfs_truncate_file(struct inode *inode) { - reiserfs_truncate_file(inode, 1) ; +static void reiserfs_vfs_truncate_file(struct inode *inode) +{ + reiserfs_truncate_file(inode, 1); } /* Sync a reiserfs file. */ @@ -116,26 +117,24 @@ static void reiserfs_vfs_truncate_file(struct inode *inode) { * be removed... */ -static int reiserfs_sync_file( - struct file * p_s_filp, - struct dentry * p_s_dentry, - int datasync - ) { - struct inode * p_s_inode = p_s_dentry->d_inode; - int n_err; - int barrier_done; - - if (!S_ISREG(p_s_inode->i_mode)) - BUG (); - n_err = sync_mapping_buffers(p_s_inode->i_mapping) ; - reiserfs_write_lock(p_s_inode->i_sb); - barrier_done = reiserfs_commit_for_inode(p_s_inode); - reiserfs_write_unlock(p_s_inode->i_sb); - if (barrier_done != 1) - blkdev_issue_flush(p_s_inode->i_sb->s_bdev, NULL); - if (barrier_done < 0) - return barrier_done; - return ( n_err < 0 ) ? -EIO : 0; +static int reiserfs_sync_file(struct file *p_s_filp, + struct dentry *p_s_dentry, int datasync) +{ + struct inode *p_s_inode = p_s_dentry->d_inode; + int n_err; + int barrier_done; + + if (!S_ISREG(p_s_inode->i_mode)) + BUG(); + n_err = sync_mapping_buffers(p_s_inode->i_mapping); + reiserfs_write_lock(p_s_inode->i_sb); + barrier_done = reiserfs_commit_for_inode(p_s_inode); + reiserfs_write_unlock(p_s_inode->i_sb); + if (barrier_done != 1) + blkdev_issue_flush(p_s_inode->i_sb->s_bdev, NULL); + if (barrier_done < 0) + return barrier_done; + return (n_err < 0) ? -EIO : 0; } /* I really do not want to play with memory shortage right now, so @@ -147,700 +146,797 @@ static int reiserfs_sync_file( /* Allocates blocks for a file to fulfil write request. Maps all unmapped but prepared pages from the list. Updates metadata with newly allocated blocknumbers as needed */ -static int reiserfs_allocate_blocks_for_region( - struct reiserfs_transaction_handle *th, - struct inode *inode, /* Inode we work with */ - loff_t pos, /* Writing position */ - int num_pages, /* number of pages write going - to touch */ - int write_bytes, /* amount of bytes to write */ - struct page **prepared_pages, /* array of - prepared pages - */ - int blocks_to_allocate /* Amount of blocks we - need to allocate to - fit the data into file - */ - ) +static int reiserfs_allocate_blocks_for_region(struct reiserfs_transaction_handle *th, struct inode *inode, /* Inode we work with */ + loff_t pos, /* Writing position */ + int num_pages, /* number of pages write going + to touch */ + int write_bytes, /* amount of bytes to write */ + struct page **prepared_pages, /* array of + prepared pages + */ + int blocks_to_allocate /* Amount of blocks we + need to allocate to + fit the data into file + */ + ) { - struct cpu_key key; // cpu key of item that we are going to deal with - struct item_head *ih; // pointer to item head that we are going to deal with - struct buffer_head *bh; // Buffer head that contains items that we are going to deal with - __le32 * item; // pointer to item we are going to deal with - INITIALIZE_PATH(path); // path to item, that we are going to deal with. - b_blocknr_t *allocated_blocks; // Pointer to a place where allocated blocknumbers would be stored. - reiserfs_blocknr_hint_t hint; // hint structure for block allocator. - size_t res; // return value of various functions that we call. - int curr_block; // current block used to keep track of unmapped blocks. - int i; // loop counter - int itempos; // position in item - unsigned int from = (pos & (PAGE_CACHE_SIZE - 1)); // writing position in - // first page - unsigned int to = ((pos + write_bytes - 1) & (PAGE_CACHE_SIZE - 1)) + 1; /* last modified byte offset in last page */ - __u64 hole_size ; // amount of blocks for a file hole, if it needed to be created. - int modifying_this_item = 0; // Flag for items traversal code to keep track - // of the fact that we already prepared - // current block for journal - int will_prealloc = 0; - RFALSE(!blocks_to_allocate, "green-9004: tried to allocate zero blocks?"); - - /* only preallocate if this is a small write */ - if (REISERFS_I(inode)->i_prealloc_count || - (!(write_bytes & (inode->i_sb->s_blocksize -1)) && - blocks_to_allocate < - REISERFS_SB(inode->i_sb)->s_alloc_options.preallocsize)) - will_prealloc = REISERFS_SB(inode->i_sb)->s_alloc_options.preallocsize; - - allocated_blocks = kmalloc((blocks_to_allocate + will_prealloc) * - sizeof(b_blocknr_t), GFP_NOFS); - - /* First we compose a key to point at the writing position, we want to do - that outside of any locking region. */ - make_cpu_key (&key, inode, pos+1, TYPE_ANY, 3/*key length*/); - - /* If we came here, it means we absolutely need to open a transaction, - since we need to allocate some blocks */ - reiserfs_write_lock(inode->i_sb); // Journaling stuff and we need that. - res = journal_begin(th, inode->i_sb, JOURNAL_PER_BALANCE_CNT * 3 + 1 + 2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb)); // Wish I know if this number enough - if (res) - goto error_exit; - reiserfs_update_inode_transaction(inode) ; - - /* Look for the in-tree position of our write, need path for block allocator */ - res = search_for_position_by_key(inode->i_sb, &key, &path); - if ( res == IO_ERROR ) { - res = -EIO; - goto error_exit; - } - - /* Allocate blocks */ - /* First fill in "hint" structure for block allocator */ - hint.th = th; // transaction handle. - hint.path = &path; // Path, so that block allocator can determine packing locality or whatever it needs to determine. - hint.inode = inode; // Inode is needed by block allocator too. - hint.search_start = 0; // We have no hint on where to search free blocks for block allocator. - hint.key = key.on_disk_key; // on disk key of file. - hint.block = inode->i_blocks>>(inode->i_sb->s_blocksize_bits-9); // Number of disk blocks this file occupies already. - hint.formatted_node = 0; // We are allocating blocks for unformatted node. - hint.preallocate = will_prealloc; - - /* Call block allocator to allocate blocks */ - res = reiserfs_allocate_blocknrs(&hint, allocated_blocks, blocks_to_allocate, blocks_to_allocate); - if ( res != CARRY_ON ) { - if ( res == NO_DISK_SPACE ) { - /* We flush the transaction in case of no space. This way some - blocks might become free */ - SB_JOURNAL(inode->i_sb)->j_must_wait = 1; - res = restart_transaction(th, inode, &path); - if (res) - goto error_exit; - - /* We might have scheduled, so search again */ - res = search_for_position_by_key(inode->i_sb, &key, &path); - if ( res == IO_ERROR ) { - res = -EIO; + struct cpu_key key; // cpu key of item that we are going to deal with + struct item_head *ih; // pointer to item head that we are going to deal with + struct buffer_head *bh; // Buffer head that contains items that we are going to deal with + __le32 *item; // pointer to item we are going to deal with + INITIALIZE_PATH(path); // path to item, that we are going to deal with. + b_blocknr_t *allocated_blocks; // Pointer to a place where allocated blocknumbers would be stored. + reiserfs_blocknr_hint_t hint; // hint structure for block allocator. + size_t res; // return value of various functions that we call. + int curr_block; // current block used to keep track of unmapped blocks. + int i; // loop counter + int itempos; // position in item + unsigned int from = (pos & (PAGE_CACHE_SIZE - 1)); // writing position in + // first page + unsigned int to = ((pos + write_bytes - 1) & (PAGE_CACHE_SIZE - 1)) + 1; /* last modified byte offset in last page */ + __u64 hole_size; // amount of blocks for a file hole, if it needed to be created. + int modifying_this_item = 0; // Flag for items traversal code to keep track + // of the fact that we already prepared + // current block for journal + int will_prealloc = 0; + RFALSE(!blocks_to_allocate, + "green-9004: tried to allocate zero blocks?"); + + /* only preallocate if this is a small write */ + if (REISERFS_I(inode)->i_prealloc_count || + (!(write_bytes & (inode->i_sb->s_blocksize - 1)) && + blocks_to_allocate < + REISERFS_SB(inode->i_sb)->s_alloc_options.preallocsize)) + will_prealloc = + REISERFS_SB(inode->i_sb)->s_alloc_options.preallocsize; + + allocated_blocks = kmalloc((blocks_to_allocate + will_prealloc) * + sizeof(b_blocknr_t), GFP_NOFS); + + /* First we compose a key to point at the writing position, we want to do + that outside of any locking region. */ + make_cpu_key(&key, inode, pos + 1, TYPE_ANY, 3 /*key length */ ); + + /* If we came here, it means we absolutely need to open a transaction, + since we need to allocate some blocks */ + reiserfs_write_lock(inode->i_sb); // Journaling stuff and we need that. + res = journal_begin(th, inode->i_sb, JOURNAL_PER_BALANCE_CNT * 3 + 1 + 2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb)); // Wish I know if this number enough + if (res) goto error_exit; - } + reiserfs_update_inode_transaction(inode); - /* update changed info for hint structure. */ - res = reiserfs_allocate_blocknrs(&hint, allocated_blocks, blocks_to_allocate, blocks_to_allocate); - if ( res != CARRY_ON ) { - res = -ENOSPC; - pathrelse(&path); + /* Look for the in-tree position of our write, need path for block allocator */ + res = search_for_position_by_key(inode->i_sb, &key, &path); + if (res == IO_ERROR) { + res = -EIO; goto error_exit; - } - } else { - res = -ENOSPC; - pathrelse(&path); - goto error_exit; } - } -#ifdef __BIG_ENDIAN - // Too bad, I have not found any way to convert a given region from - // cpu format to little endian format - { - int i; - for ( i = 0; i < blocks_to_allocate ; i++) - allocated_blocks[i]=cpu_to_le32(allocated_blocks[i]); - } -#endif - - /* Blocks allocating well might have scheduled and tree might have changed, - let's search the tree again */ - /* find where in the tree our write should go */ - res = search_for_position_by_key(inode->i_sb, &key, &path); - if ( res == IO_ERROR ) { - res = -EIO; - goto error_exit_free_blocks; - } - - bh = get_last_bh( &path ); // Get a bufferhead for last element in path. - ih = get_ih( &path ); // Get a pointer to last item head in path. - item = get_item( &path ); // Get a pointer to last item in path - - /* Let's see what we have found */ - if ( res != POSITION_FOUND ) { /* position not found, this means that we - might need to append file with holes - first */ - // Since we are writing past the file's end, we need to find out if - // there is a hole that needs to be inserted before our writing - // position, and how many blocks it is going to cover (we need to - // populate pointers to file blocks representing the hole with zeros) + /* Allocate blocks */ + /* First fill in "hint" structure for block allocator */ + hint.th = th; // transaction handle. + hint.path = &path; // Path, so that block allocator can determine packing locality or whatever it needs to determine. + hint.inode = inode; // Inode is needed by block allocator too. + hint.search_start = 0; // We have no hint on where to search free blocks for block allocator. + hint.key = key.on_disk_key; // on disk key of file. + hint.block = inode->i_blocks >> (inode->i_sb->s_blocksize_bits - 9); // Number of disk blocks this file occupies already. + hint.formatted_node = 0; // We are allocating blocks for unformatted node. + hint.preallocate = will_prealloc; + + /* Call block allocator to allocate blocks */ + res = + reiserfs_allocate_blocknrs(&hint, allocated_blocks, + blocks_to_allocate, blocks_to_allocate); + if (res != CARRY_ON) { + if (res == NO_DISK_SPACE) { + /* We flush the transaction in case of no space. This way some + blocks might become free */ + SB_JOURNAL(inode->i_sb)->j_must_wait = 1; + res = restart_transaction(th, inode, &path); + if (res) + goto error_exit; + + /* We might have scheduled, so search again */ + res = + search_for_position_by_key(inode->i_sb, &key, + &path); + if (res == IO_ERROR) { + res = -EIO; + goto error_exit; + } + /* update changed info for hint structure. */ + res = + reiserfs_allocate_blocknrs(&hint, allocated_blocks, + blocks_to_allocate, + blocks_to_allocate); + if (res != CARRY_ON) { + res = -ENOSPC; + pathrelse(&path); + goto error_exit; + } + } else { + res = -ENOSPC; + pathrelse(&path); + goto error_exit; + } + } +#ifdef __BIG_ENDIAN + // Too bad, I have not found any way to convert a given region from + // cpu format to little endian format { - int item_offset = 1; - /* - * if ih is stat data, its offset is 0 and we don't want to - * add 1 to pos in the hole_size calculation - */ - if (is_statdata_le_ih(ih)) - item_offset = 0; - hole_size = (pos + item_offset - - (le_key_k_offset( get_inode_item_key_version(inode), - &(ih->ih_key)) + - op_bytes_number(ih, inode->i_sb->s_blocksize))) >> - inode->i_sb->s_blocksize_bits; + int i; + for (i = 0; i < blocks_to_allocate; i++) + allocated_blocks[i] = cpu_to_le32(allocated_blocks[i]); } +#endif - if ( hole_size > 0 ) { - int to_paste = min_t(__u64, hole_size, MAX_ITEM_LEN(inode->i_sb->s_blocksize)/UNFM_P_SIZE ); // How much data to insert first time. - /* area filled with zeroes, to supply as list of zero blocknumbers - We allocate it outside of loop just in case loop would spin for - several iterations. */ - char *zeros = kmalloc(to_paste*UNFM_P_SIZE, GFP_ATOMIC); // We cannot insert more than MAX_ITEM_LEN bytes anyway. - if ( !zeros ) { - res = -ENOMEM; + /* Blocks allocating well might have scheduled and tree might have changed, + let's search the tree again */ + /* find where in the tree our write should go */ + res = search_for_position_by_key(inode->i_sb, &key, &path); + if (res == IO_ERROR) { + res = -EIO; goto error_exit_free_blocks; - } - memset ( zeros, 0, to_paste*UNFM_P_SIZE); - do { - to_paste = min_t(__u64, hole_size, MAX_ITEM_LEN(inode->i_sb->s_blocksize)/UNFM_P_SIZE ); - if ( is_indirect_le_ih(ih) ) { - /* Ok, there is existing indirect item already. Need to append it */ - /* Calculate position past inserted item */ - make_cpu_key( &key, inode, le_key_k_offset( get_inode_item_key_version(inode), &(ih->ih_key)) + op_bytes_number(ih, inode->i_sb->s_blocksize), TYPE_INDIRECT, 3); - res = reiserfs_paste_into_item( th, &path, &key, inode, (char *)zeros, UNFM_P_SIZE*to_paste); - if ( res ) { - kfree(zeros); - goto error_exit_free_blocks; - } - } else if ( is_statdata_le_ih(ih) ) { - /* No existing item, create it */ - /* item head for new item */ - struct item_head ins_ih; - - /* create a key for our new item */ - make_cpu_key( &key, inode, 1, TYPE_INDIRECT, 3); - - /* Create new item head for our new item */ - make_le_item_head (&ins_ih, &key, key.version, 1, - TYPE_INDIRECT, to_paste*UNFM_P_SIZE, - 0 /* free space */); - - /* Find where such item should live in the tree */ - res = search_item (inode->i_sb, &key, &path); - if ( res != ITEM_NOT_FOUND ) { - /* item should not exist, otherwise we have error */ - if ( res != -ENOSPC ) { - reiserfs_warning (inode->i_sb, - "green-9008: search_by_key (%K) returned %d", - &key, res); + } + + bh = get_last_bh(&path); // Get a bufferhead for last element in path. + ih = get_ih(&path); // Get a pointer to last item head in path. + item = get_item(&path); // Get a pointer to last item in path + + /* Let's see what we have found */ + if (res != POSITION_FOUND) { /* position not found, this means that we + might need to append file with holes + first */ + // Since we are writing past the file's end, we need to find out if + // there is a hole that needs to be inserted before our writing + // position, and how many blocks it is going to cover (we need to + // populate pointers to file blocks representing the hole with zeros) + + { + int item_offset = 1; + /* + * if ih is stat data, its offset is 0 and we don't want to + * add 1 to pos in the hole_size calculation + */ + if (is_statdata_le_ih(ih)) + item_offset = 0; + hole_size = (pos + item_offset - + (le_key_k_offset + (get_inode_item_key_version(inode), + &(ih->ih_key)) + op_bytes_number(ih, + inode-> + i_sb-> + s_blocksize))) + >> inode->i_sb->s_blocksize_bits; + } + + if (hole_size > 0) { + int to_paste = min_t(__u64, hole_size, MAX_ITEM_LEN(inode->i_sb->s_blocksize) / UNFM_P_SIZE); // How much data to insert first time. + /* area filled with zeroes, to supply as list of zero blocknumbers + We allocate it outside of loop just in case loop would spin for + several iterations. */ + char *zeros = kmalloc(to_paste * UNFM_P_SIZE, GFP_ATOMIC); // We cannot insert more than MAX_ITEM_LEN bytes anyway. + if (!zeros) { + res = -ENOMEM; + goto error_exit_free_blocks; } - res = -EIO; - kfree(zeros); - goto error_exit_free_blocks; - } - res = reiserfs_insert_item( th, &path, &key, &ins_ih, inode, (char *)zeros); - } else { - reiserfs_panic(inode->i_sb, "green-9011: Unexpected key type %K\n", &key); + memset(zeros, 0, to_paste * UNFM_P_SIZE); + do { + to_paste = + min_t(__u64, hole_size, + MAX_ITEM_LEN(inode->i_sb-> + s_blocksize) / + UNFM_P_SIZE); + if (is_indirect_le_ih(ih)) { + /* Ok, there is existing indirect item already. Need to append it */ + /* Calculate position past inserted item */ + make_cpu_key(&key, inode, + le_key_k_offset + (get_inode_item_key_version + (inode), + &(ih->ih_key)) + + op_bytes_number(ih, + inode-> + i_sb-> + s_blocksize), + TYPE_INDIRECT, 3); + res = + reiserfs_paste_into_item(th, &path, + &key, + inode, + (char *) + zeros, + UNFM_P_SIZE + * + to_paste); + if (res) { + kfree(zeros); + goto error_exit_free_blocks; + } + } else if (is_statdata_le_ih(ih)) { + /* No existing item, create it */ + /* item head for new item */ + struct item_head ins_ih; + + /* create a key for our new item */ + make_cpu_key(&key, inode, 1, + TYPE_INDIRECT, 3); + + /* Create new item head for our new item */ + make_le_item_head(&ins_ih, &key, + key.version, 1, + TYPE_INDIRECT, + to_paste * + UNFM_P_SIZE, + 0 /* free space */ ); + + /* Find where such item should live in the tree */ + res = + search_item(inode->i_sb, &key, + &path); + if (res != ITEM_NOT_FOUND) { + /* item should not exist, otherwise we have error */ + if (res != -ENOSPC) { + reiserfs_warning(inode-> + i_sb, + "green-9008: search_by_key (%K) returned %d", + &key, + res); + } + res = -EIO; + kfree(zeros); + goto error_exit_free_blocks; + } + res = + reiserfs_insert_item(th, &path, + &key, &ins_ih, + inode, + (char *)zeros); + } else { + reiserfs_panic(inode->i_sb, + "green-9011: Unexpected key type %K\n", + &key); + } + if (res) { + kfree(zeros); + goto error_exit_free_blocks; + } + /* Now we want to check if transaction is too full, and if it is + we restart it. This will also free the path. */ + if (journal_transaction_should_end + (th, th->t_blocks_allocated)) { + res = + restart_transaction(th, inode, + &path); + if (res) { + pathrelse(&path); + kfree(zeros); + goto error_exit; + } + } + + /* Well, need to recalculate path and stuff */ + set_cpu_key_k_offset(&key, + cpu_key_k_offset(&key) + + (to_paste << inode-> + i_blkbits)); + res = + search_for_position_by_key(inode->i_sb, + &key, &path); + if (res == IO_ERROR) { + res = -EIO; + kfree(zeros); + goto error_exit_free_blocks; + } + bh = get_last_bh(&path); + ih = get_ih(&path); + item = get_item(&path); + hole_size -= to_paste; + } while (hole_size); + kfree(zeros); } - if ( res ) { - kfree(zeros); - goto error_exit_free_blocks; + } + // Go through existing indirect items first + // replace all zeroes with blocknumbers from list + // Note that if no corresponding item was found, by previous search, + // it means there are no existing in-tree representation for file area + // we are going to overwrite, so there is nothing to scan through for holes. + for (curr_block = 0, itempos = path.pos_in_item; + curr_block < blocks_to_allocate && res == POSITION_FOUND;) { + retry: + + if (itempos >= ih_item_len(ih) / UNFM_P_SIZE) { + /* We run out of data in this indirect item, let's look for another + one. */ + /* First if we are already modifying current item, log it */ + if (modifying_this_item) { + journal_mark_dirty(th, inode->i_sb, bh); + modifying_this_item = 0; + } + /* Then set the key to look for a new indirect item (offset of old + item is added to old item length */ + set_cpu_key_k_offset(&key, + le_key_k_offset + (get_inode_item_key_version(inode), + &(ih->ih_key)) + + op_bytes_number(ih, + inode->i_sb-> + s_blocksize)); + /* Search ofor position of new key in the tree. */ + res = + search_for_position_by_key(inode->i_sb, &key, + &path); + if (res == IO_ERROR) { + res = -EIO; + goto error_exit_free_blocks; + } + bh = get_last_bh(&path); + ih = get_ih(&path); + item = get_item(&path); + itempos = path.pos_in_item; + continue; // loop to check all kinds of conditions and so on. } - /* Now we want to check if transaction is too full, and if it is - we restart it. This will also free the path. */ - if (journal_transaction_should_end(th, th->t_blocks_allocated)) { - res = restart_transaction(th, inode, &path); - if (res) { - pathrelse (&path); - kfree(zeros); - goto error_exit; - } - } - - /* Well, need to recalculate path and stuff */ - set_cpu_key_k_offset( &key, cpu_key_k_offset(&key) + (to_paste << inode->i_blkbits)); - res = search_for_position_by_key(inode->i_sb, &key, &path); - if ( res == IO_ERROR ) { - res = -EIO; - kfree(zeros); - goto error_exit_free_blocks; + /* Ok, we have correct position in item now, so let's see if it is + representing file hole (blocknumber is zero) and fill it if needed */ + if (!item[itempos]) { + /* Ok, a hole. Now we need to check if we already prepared this + block to be journaled */ + while (!modifying_this_item) { // loop until succeed + /* Well, this item is not journaled yet, so we must prepare + it for journal first, before we can change it */ + struct item_head tmp_ih; // We copy item head of found item, + // here to detect if fs changed under + // us while we were preparing for + // journal. + int fs_gen; // We store fs generation here to find if someone + // changes fs under our feet + + copy_item_head(&tmp_ih, ih); // Remember itemhead + fs_gen = get_generation(inode->i_sb); // remember fs generation + reiserfs_prepare_for_journal(inode->i_sb, bh, 1); // Prepare a buffer within which indirect item is stored for changing. + if (fs_changed(fs_gen, inode->i_sb) + && item_moved(&tmp_ih, &path)) { + // Sigh, fs was changed under us, we need to look for new + // location of item we are working with + + /* unmark prepaerd area as journaled and search for it's + new position */ + reiserfs_restore_prepared_buffer(inode-> + i_sb, + bh); + res = + search_for_position_by_key(inode-> + i_sb, + &key, + &path); + if (res == IO_ERROR) { + res = -EIO; + goto error_exit_free_blocks; + } + bh = get_last_bh(&path); + ih = get_ih(&path); + item = get_item(&path); + itempos = path.pos_in_item; + goto retry; + } + modifying_this_item = 1; + } + item[itempos] = allocated_blocks[curr_block]; // Assign new block + curr_block++; } - bh=get_last_bh(&path); - ih=get_ih(&path); - item = get_item(&path); - hole_size -= to_paste; - } while ( hole_size ); - kfree(zeros); + itempos++; } - } - - // Go through existing indirect items first - // replace all zeroes with blocknumbers from list - // Note that if no corresponding item was found, by previous search, - // it means there are no existing in-tree representation for file area - // we are going to overwrite, so there is nothing to scan through for holes. - for ( curr_block = 0, itempos = path.pos_in_item ; curr_block < blocks_to_allocate && res == POSITION_FOUND ; ) { -retry: - - if ( itempos >= ih_item_len(ih)/UNFM_P_SIZE ) { - /* We run out of data in this indirect item, let's look for another - one. */ - /* First if we are already modifying current item, log it */ - if ( modifying_this_item ) { - journal_mark_dirty (th, inode->i_sb, bh); - modifying_this_item = 0; - } - /* Then set the key to look for a new indirect item (offset of old - item is added to old item length */ - set_cpu_key_k_offset( &key, le_key_k_offset( get_inode_item_key_version(inode), &(ih->ih_key)) + op_bytes_number(ih, inode->i_sb->s_blocksize)); - /* Search ofor position of new key in the tree. */ - res = search_for_position_by_key(inode->i_sb, &key, &path); - if ( res == IO_ERROR) { - res = -EIO; - goto error_exit_free_blocks; - } - bh=get_last_bh(&path); - ih=get_ih(&path); - item = get_item(&path); - itempos = path.pos_in_item; - continue; // loop to check all kinds of conditions and so on. + + if (modifying_this_item) { // We need to log last-accessed block, if it + // was modified, but not logged yet. + journal_mark_dirty(th, inode->i_sb, bh); } - /* Ok, we have correct position in item now, so let's see if it is - representing file hole (blocknumber is zero) and fill it if needed */ - if ( !item[itempos] ) { - /* Ok, a hole. Now we need to check if we already prepared this - block to be journaled */ - while ( !modifying_this_item ) { // loop until succeed - /* Well, this item is not journaled yet, so we must prepare - it for journal first, before we can change it */ - struct item_head tmp_ih; // We copy item head of found item, - // here to detect if fs changed under - // us while we were preparing for - // journal. - int fs_gen; // We store fs generation here to find if someone - // changes fs under our feet - - copy_item_head (&tmp_ih, ih); // Remember itemhead - fs_gen = get_generation (inode->i_sb); // remember fs generation - reiserfs_prepare_for_journal(inode->i_sb, bh, 1); // Prepare a buffer within which indirect item is stored for changing. - if (fs_changed (fs_gen, inode->i_sb) && item_moved (&tmp_ih, &path)) { - // Sigh, fs was changed under us, we need to look for new - // location of item we are working with - - /* unmark prepaerd area as journaled and search for it's - new position */ - reiserfs_restore_prepared_buffer(inode->i_sb, bh); - res = search_for_position_by_key(inode->i_sb, &key, &path); - if ( res == IO_ERROR) { - res = -EIO; - goto error_exit_free_blocks; - } - bh=get_last_bh(&path); - ih=get_ih(&path); - item = get_item(&path); - itempos = path.pos_in_item; - goto retry; + + if (curr_block < blocks_to_allocate) { + // Oh, well need to append to indirect item, or to create indirect item + // if there weren't any + if (is_indirect_le_ih(ih)) { + // Existing indirect item - append. First calculate key for append + // position. We do not need to recalculate path as it should + // already point to correct place. + make_cpu_key(&key, inode, + le_key_k_offset(get_inode_item_key_version + (inode), + &(ih->ih_key)) + + op_bytes_number(ih, + inode->i_sb->s_blocksize), + TYPE_INDIRECT, 3); + res = + reiserfs_paste_into_item(th, &path, &key, inode, + (char *)(allocated_blocks + + curr_block), + UNFM_P_SIZE * + (blocks_to_allocate - + curr_block)); + if (res) { + goto error_exit_free_blocks; + } + } else if (is_statdata_le_ih(ih)) { + // Last found item was statdata. That means we need to create indirect item. + struct item_head ins_ih; /* itemhead for new item */ + + /* create a key for our new item */ + make_cpu_key(&key, inode, 1, TYPE_INDIRECT, 3); // Position one, + // because that's + // where first + // indirect item + // begins + /* Create new item head for our new item */ + make_le_item_head(&ins_ih, &key, key.version, 1, + TYPE_INDIRECT, + (blocks_to_allocate - + curr_block) * UNFM_P_SIZE, + 0 /* free space */ ); + /* Find where such item should live in the tree */ + res = search_item(inode->i_sb, &key, &path); + if (res != ITEM_NOT_FOUND) { + /* Well, if we have found such item already, or some error + occured, we need to warn user and return error */ + if (res != -ENOSPC) { + reiserfs_warning(inode->i_sb, + "green-9009: search_by_key (%K) " + "returned %d", &key, + res); + } + res = -EIO; + goto error_exit_free_blocks; + } + /* Insert item into the tree with the data as its body */ + res = + reiserfs_insert_item(th, &path, &key, &ins_ih, + inode, + (char *)(allocated_blocks + + curr_block)); + } else { + reiserfs_panic(inode->i_sb, + "green-9010: unexpected item type for key %K\n", + &key); } - modifying_this_item = 1; - } - item[itempos] = allocated_blocks[curr_block]; // Assign new block - curr_block++; } - itempos++; - } - - if ( modifying_this_item ) { // We need to log last-accessed block, if it - // was modified, but not logged yet. - journal_mark_dirty (th, inode->i_sb, bh); - } - - if ( curr_block < blocks_to_allocate ) { - // Oh, well need to append to indirect item, or to create indirect item - // if there weren't any - if ( is_indirect_le_ih(ih) ) { - // Existing indirect item - append. First calculate key for append - // position. We do not need to recalculate path as it should - // already point to correct place. - make_cpu_key( &key, inode, le_key_k_offset( get_inode_item_key_version(inode), &(ih->ih_key)) + op_bytes_number(ih, inode->i_sb->s_blocksize), TYPE_INDIRECT, 3); - res = reiserfs_paste_into_item( th, &path, &key, inode, (char *)(allocated_blocks+curr_block), UNFM_P_SIZE*(blocks_to_allocate-curr_block)); - if ( res ) { - goto error_exit_free_blocks; - } - } else if (is_statdata_le_ih(ih) ) { - // Last found item was statdata. That means we need to create indirect item. - struct item_head ins_ih; /* itemhead for new item */ - - /* create a key for our new item */ - make_cpu_key( &key, inode, 1, TYPE_INDIRECT, 3); // Position one, - // because that's - // where first - // indirect item - // begins - /* Create new item head for our new item */ - make_le_item_head (&ins_ih, &key, key.version, 1, TYPE_INDIRECT, - (blocks_to_allocate-curr_block)*UNFM_P_SIZE, - 0 /* free space */); - /* Find where such item should live in the tree */ - res = search_item (inode->i_sb, &key, &path); - if ( res != ITEM_NOT_FOUND ) { - /* Well, if we have found such item already, or some error - occured, we need to warn user and return error */ - if ( res != -ENOSPC ) { - reiserfs_warning (inode->i_sb, - "green-9009: search_by_key (%K) " - "returned %d", &key, res); + // the caller is responsible for closing the transaction + // unless we return an error, they are also responsible for logging + // the inode. + // + pathrelse(&path); + /* + * cleanup prellocation from previous writes + * if this is a partial block write + */ + if (write_bytes & (inode->i_sb->s_blocksize - 1)) + reiserfs_discard_prealloc(th, inode); + reiserfs_write_unlock(inode->i_sb); + + // go through all the pages/buffers and map the buffers to newly allocated + // blocks (so that system knows where to write these pages later). + curr_block = 0; + for (i = 0; i < num_pages; i++) { + struct page *page = prepared_pages[i]; //current page + struct buffer_head *head = page_buffers(page); // first buffer for a page + int block_start, block_end; // in-page offsets for buffers. + + if (!page_buffers(page)) + reiserfs_panic(inode->i_sb, + "green-9005: No buffers for prepared page???"); + + /* For each buffer in page */ + for (bh = head, block_start = 0; bh != head || !block_start; + block_start = block_end, bh = bh->b_this_page) { + if (!bh) + reiserfs_panic(inode->i_sb, + "green-9006: Allocated but absent buffer for a page?"); + block_end = block_start + inode->i_sb->s_blocksize; + if (i == 0 && block_end <= from) + /* if this buffer is before requested data to map, skip it */ + continue; + if (i == num_pages - 1 && block_start >= to) + /* If this buffer is after requested data to map, abort + processing of current page */ + break; + + if (!buffer_mapped(bh)) { // Ok, unmapped buffer, need to map it + map_bh(bh, inode->i_sb, + le32_to_cpu(allocated_blocks + [curr_block])); + curr_block++; + set_buffer_new(bh); + } } - res = -EIO; - goto error_exit_free_blocks; - } - /* Insert item into the tree with the data as its body */ - res = reiserfs_insert_item( th, &path, &key, &ins_ih, inode, (char *)(allocated_blocks+curr_block)); - } else { - reiserfs_panic(inode->i_sb, "green-9010: unexpected item type for key %K\n",&key); - } - } - - // the caller is responsible for closing the transaction - // unless we return an error, they are also responsible for logging - // the inode. - // - pathrelse(&path); - /* - * cleanup prellocation from previous writes - * if this is a partial block write - */ - if (write_bytes & (inode->i_sb->s_blocksize -1)) - reiserfs_discard_prealloc(th, inode); - reiserfs_write_unlock(inode->i_sb); - - // go through all the pages/buffers and map the buffers to newly allocated - // blocks (so that system knows where to write these pages later). - curr_block = 0; - for ( i = 0; i < num_pages ; i++ ) { - struct page *page=prepared_pages[i]; //current page - struct buffer_head *head = page_buffers(page);// first buffer for a page - int block_start, block_end; // in-page offsets for buffers. - - if (!page_buffers(page)) - reiserfs_panic(inode->i_sb, "green-9005: No buffers for prepared page???"); - - /* For each buffer in page */ - for(bh = head, block_start = 0; bh != head || !block_start; - block_start=block_end, bh = bh->b_this_page) { - if (!bh) - reiserfs_panic(inode->i_sb, "green-9006: Allocated but absent buffer for a page?"); - block_end = block_start+inode->i_sb->s_blocksize; - if (i == 0 && block_end <= from ) - /* if this buffer is before requested data to map, skip it */ - continue; - if (i == num_pages - 1 && block_start >= to) - /* If this buffer is after requested data to map, abort - processing of current page */ - break; - - if ( !buffer_mapped(bh) ) { // Ok, unmapped buffer, need to map it - map_bh( bh, inode->i_sb, le32_to_cpu(allocated_blocks[curr_block])); - curr_block++; - set_buffer_new(bh); - } } - } - RFALSE( curr_block > blocks_to_allocate, "green-9007: Used too many blocks? weird"); + RFALSE(curr_block > blocks_to_allocate, + "green-9007: Used too many blocks? weird"); - kfree(allocated_blocks); - return 0; + kfree(allocated_blocks); + return 0; // Need to deal with transaction here. -error_exit_free_blocks: - pathrelse(&path); - // free blocks - for( i = 0; i < blocks_to_allocate; i++ ) - reiserfs_free_block(th, inode, le32_to_cpu(allocated_blocks[i]), 1); - -error_exit: - if (th->t_trans_id) { - int err; - // update any changes we made to blk count - reiserfs_update_sd(th, inode); - err = journal_end(th, inode->i_sb, JOURNAL_PER_BALANCE_CNT * 3 + 1 + 2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb)); - if (err) - res = err; - } - reiserfs_write_unlock(inode->i_sb); - kfree(allocated_blocks); - - return res; + error_exit_free_blocks: + pathrelse(&path); + // free blocks + for (i = 0; i < blocks_to_allocate; i++) + reiserfs_free_block(th, inode, le32_to_cpu(allocated_blocks[i]), + 1); + + error_exit: + if (th->t_trans_id) { + int err; + // update any changes we made to blk count + reiserfs_update_sd(th, inode); + err = + journal_end(th, inode->i_sb, + JOURNAL_PER_BALANCE_CNT * 3 + 1 + + 2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb)); + if (err) + res = err; + } + reiserfs_write_unlock(inode->i_sb); + kfree(allocated_blocks); + + return res; } /* Unlock pages prepared by reiserfs_prepare_file_region_for_write */ -static void reiserfs_unprepare_pages(struct page **prepared_pages, /* list of locked pages */ - size_t num_pages /* amount of pages */) { - int i; // loop counter +static void reiserfs_unprepare_pages(struct page **prepared_pages, /* list of locked pages */ + size_t num_pages /* amount of pages */ ) +{ + int i; // loop counter - for (i=0; i < num_pages ; i++) { - struct page *page = prepared_pages[i]; + for (i = 0; i < num_pages; i++) { + struct page *page = prepared_pages[i]; - try_to_free_buffers(page); - unlock_page(page); - page_cache_release(page); - } + try_to_free_buffers(page); + unlock_page(page); + page_cache_release(page); + } } /* This function will copy data from userspace to specified pages within supplied byte range */ -static int reiserfs_copy_from_user_to_file_region( - loff_t pos, /* In-file position */ - int num_pages, /* Number of pages affected */ - int write_bytes, /* Amount of bytes to write */ - struct page **prepared_pages, /* pointer to - array to - prepared pages - */ - const char __user *buf /* Pointer to user-supplied - data*/ - ) +static int reiserfs_copy_from_user_to_file_region(loff_t pos, /* In-file position */ + int num_pages, /* Number of pages affected */ + int write_bytes, /* Amount of bytes to write */ + struct page **prepared_pages, /* pointer to + array to + prepared pages + */ + const char __user * buf /* Pointer to user-supplied + data */ + ) { - long page_fault=0; // status of copy_from_user. - int i; // loop counter. - int offset; // offset in page - - for ( i = 0, offset = (pos & (PAGE_CACHE_SIZE-1)); i < num_pages ; i++,offset=0) { - size_t count = min_t(size_t,PAGE_CACHE_SIZE-offset,write_bytes); // How much of bytes to write to this page - struct page *page=prepared_pages[i]; // Current page we process. - - fault_in_pages_readable( buf, count); - - /* Copy data from userspace to the current page */ - kmap(page); - page_fault = __copy_from_user(page_address(page)+offset, buf, count); // Copy the data. - /* Flush processor's dcache for this page */ - flush_dcache_page(page); - kunmap(page); - buf+=count; - write_bytes-=count; - - if (page_fault) - break; // Was there a fault? abort. - } - - return page_fault?-EFAULT:0; + long page_fault = 0; // status of copy_from_user. + int i; // loop counter. + int offset; // offset in page + + for (i = 0, offset = (pos & (PAGE_CACHE_SIZE - 1)); i < num_pages; + i++, offset = 0) { + size_t count = min_t(size_t, PAGE_CACHE_SIZE - offset, write_bytes); // How much of bytes to write to this page + struct page *page = prepared_pages[i]; // Current page we process. + + fault_in_pages_readable(buf, count); + + /* Copy data from userspace to the current page */ + kmap(page); + page_fault = __copy_from_user(page_address(page) + offset, buf, count); // Copy the data. + /* Flush processor's dcache for this page */ + flush_dcache_page(page); + kunmap(page); + buf += count; + write_bytes -= count; + + if (page_fault) + break; // Was there a fault? abort. + } + + return page_fault ? -EFAULT : 0; } /* taken fs/buffer.c:__block_commit_write */ int reiserfs_commit_page(struct inode *inode, struct page *page, - unsigned from, unsigned to) + unsigned from, unsigned to) { - unsigned block_start, block_end; - int partial = 0; - unsigned blocksize; - struct buffer_head *bh, *head; - unsigned long i_size_index = inode->i_size >> PAGE_CACHE_SHIFT; - int new; - int logit = reiserfs_file_data_log(inode); - struct super_block *s = inode->i_sb; - int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize; - struct reiserfs_transaction_handle th; - int ret = 0; - - th.t_trans_id = 0; - blocksize = 1 << inode->i_blkbits; - - if (logit) { - reiserfs_write_lock(s); - ret = journal_begin(&th, s, bh_per_page + 1); - if (ret) - goto drop_write_lock; - reiserfs_update_inode_transaction(inode); - } - for(bh = head = page_buffers(page), block_start = 0; - bh != head || !block_start; - block_start=block_end, bh = bh->b_this_page) - { - - new = buffer_new(bh); - clear_buffer_new(bh); - block_end = block_start + blocksize; - if (block_end <= from || block_start >= to) { - if (!buffer_uptodate(bh)) - partial = 1; - } else { - set_buffer_uptodate(bh); - if (logit) { - reiserfs_prepare_for_journal(s, bh, 1); - journal_mark_dirty(&th, s, bh); - } else if (!buffer_dirty(bh)) { - mark_buffer_dirty(bh); - /* do data=ordered on any page past the end - * of file and any buffer marked BH_New. - */ - if (reiserfs_data_ordered(inode->i_sb) && - (new || page->index >= i_size_index)) { - reiserfs_add_ordered_list(inode, bh); - } - } + unsigned block_start, block_end; + int partial = 0; + unsigned blocksize; + struct buffer_head *bh, *head; + unsigned long i_size_index = inode->i_size >> PAGE_CACHE_SHIFT; + int new; + int logit = reiserfs_file_data_log(inode); + struct super_block *s = inode->i_sb; + int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize; + struct reiserfs_transaction_handle th; + int ret = 0; + + th.t_trans_id = 0; + blocksize = 1 << inode->i_blkbits; + + if (logit) { + reiserfs_write_lock(s); + ret = journal_begin(&th, s, bh_per_page + 1); + if (ret) + goto drop_write_lock; + reiserfs_update_inode_transaction(inode); + } + for (bh = head = page_buffers(page), block_start = 0; + bh != head || !block_start; + block_start = block_end, bh = bh->b_this_page) { + + new = buffer_new(bh); + clear_buffer_new(bh); + block_end = block_start + blocksize; + if (block_end <= from || block_start >= to) { + if (!buffer_uptodate(bh)) + partial = 1; + } else { + set_buffer_uptodate(bh); + if (logit) { + reiserfs_prepare_for_journal(s, bh, 1); + journal_mark_dirty(&th, s, bh); + } else if (!buffer_dirty(bh)) { + mark_buffer_dirty(bh); + /* do data=ordered on any page past the end + * of file and any buffer marked BH_New. + */ + if (reiserfs_data_ordered(inode->i_sb) && + (new || page->index >= i_size_index)) { + reiserfs_add_ordered_list(inode, bh); + } + } + } } - } - if (logit) { - ret = journal_end(&th, s, bh_per_page + 1); -drop_write_lock: - reiserfs_write_unlock(s); - } - /* - * If this is a partial write which happened to make all buffers - * uptodate then we can optimize away a bogus readpage() for - * the next read(). Here we 'discover' whether the page went - * uptodate as a result of this (potentially partial) write. - */ - if (!partial) - SetPageUptodate(page); - return ret; + if (logit) { + ret = journal_end(&th, s, bh_per_page + 1); + drop_write_lock: + reiserfs_write_unlock(s); + } + /* + * If this is a partial write which happened to make all buffers + * uptodate then we can optimize away a bogus readpage() for + * the next read(). Here we 'discover' whether the page went + * uptodate as a result of this (potentially partial) write. + */ + if (!partial) + SetPageUptodate(page); + return ret; } - /* Submit pages for write. This was separated from actual file copying because we might want to allocate block numbers in-between. This function assumes that caller will adjust file size to correct value. */ -static int reiserfs_submit_file_region_for_write( - struct reiserfs_transaction_handle *th, - struct inode *inode, - loff_t pos, /* Writing position offset */ - size_t num_pages, /* Number of pages to write */ - size_t write_bytes, /* number of bytes to write */ - struct page **prepared_pages /* list of pages */ - ) +static int reiserfs_submit_file_region_for_write(struct reiserfs_transaction_handle *th, struct inode *inode, loff_t pos, /* Writing position offset */ + size_t num_pages, /* Number of pages to write */ + size_t write_bytes, /* number of bytes to write */ + struct page **prepared_pages /* list of pages */ + ) { - int status; // return status of block_commit_write. - int retval = 0; // Return value we are going to return. - int i; // loop counter - int offset; // Writing offset in page. - int orig_write_bytes = write_bytes; - int sd_update = 0; - - for ( i = 0, offset = (pos & (PAGE_CACHE_SIZE-1)); i < num_pages ; i++,offset=0) { - int count = min_t(int,PAGE_CACHE_SIZE-offset,write_bytes); // How much of bytes to write to this page - struct page *page=prepared_pages[i]; // Current page we process. - - status = reiserfs_commit_page(inode, page, offset, offset+count); - if ( status ) - retval = status; // To not overcomplicate matters We are going to - // submit all the pages even if there was error. - // we only remember error status to report it on - // exit. - write_bytes-=count; - } - /* now that we've gotten all the ordered buffers marked dirty, - * we can safely update i_size and close any running transaction - */ - if ( pos + orig_write_bytes > inode->i_size) { - inode->i_size = pos + orig_write_bytes; // Set new size - /* If the file have grown so much that tail packing is no - * longer possible, reset "need to pack" flag */ - if ( (have_large_tails (inode->i_sb) && - inode->i_size > i_block_size (inode)*4) || - (have_small_tails (inode->i_sb) && - inode->i_size > i_block_size(inode)) ) - REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask ; - else if ( (have_large_tails (inode->i_sb) && - inode->i_size < i_block_size (inode)*4) || - (have_small_tails (inode->i_sb) && - inode->i_size < i_block_size(inode)) ) - REISERFS_I(inode)->i_flags |= i_pack_on_close_mask ; - + int status; // return status of block_commit_write. + int retval = 0; // Return value we are going to return. + int i; // loop counter + int offset; // Writing offset in page. + int orig_write_bytes = write_bytes; + int sd_update = 0; + + for (i = 0, offset = (pos & (PAGE_CACHE_SIZE - 1)); i < num_pages; + i++, offset = 0) { + int count = min_t(int, PAGE_CACHE_SIZE - offset, write_bytes); // How much of bytes to write to this page + struct page *page = prepared_pages[i]; // Current page we process. + + status = + reiserfs_commit_page(inode, page, offset, offset + count); + if (status) + retval = status; // To not overcomplicate matters We are going to + // submit all the pages even if there was error. + // we only remember error status to report it on + // exit. + write_bytes -= count; + } + /* now that we've gotten all the ordered buffers marked dirty, + * we can safely update i_size and close any running transaction + */ + if (pos + orig_write_bytes > inode->i_size) { + inode->i_size = pos + orig_write_bytes; // Set new size + /* If the file have grown so much that tail packing is no + * longer possible, reset "need to pack" flag */ + if ((have_large_tails(inode->i_sb) && + inode->i_size > i_block_size(inode) * 4) || + (have_small_tails(inode->i_sb) && + inode->i_size > i_block_size(inode))) + REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask; + else if ((have_large_tails(inode->i_sb) && + inode->i_size < i_block_size(inode) * 4) || + (have_small_tails(inode->i_sb) && + inode->i_size < i_block_size(inode))) + REISERFS_I(inode)->i_flags |= i_pack_on_close_mask; + + if (th->t_trans_id) { + reiserfs_write_lock(inode->i_sb); + reiserfs_update_sd(th, inode); // And update on-disk metadata + reiserfs_write_unlock(inode->i_sb); + } else + inode->i_sb->s_op->dirty_inode(inode); + + sd_update = 1; + } if (th->t_trans_id) { - reiserfs_write_lock(inode->i_sb); - reiserfs_update_sd(th, inode); // And update on-disk metadata - reiserfs_write_unlock(inode->i_sb); - } else - inode->i_sb->s_op->dirty_inode(inode); + reiserfs_write_lock(inode->i_sb); + if (!sd_update) + reiserfs_update_sd(th, inode); + status = journal_end(th, th->t_super, th->t_blocks_allocated); + if (status) + retval = status; + reiserfs_write_unlock(inode->i_sb); + } + th->t_trans_id = 0; - sd_update = 1; - } - if (th->t_trans_id) { - reiserfs_write_lock(inode->i_sb); - if (!sd_update) - reiserfs_update_sd(th, inode); - status = journal_end(th, th->t_super, th->t_blocks_allocated); - if (status) - retval = status; - reiserfs_write_unlock(inode->i_sb); - } - th->t_trans_id = 0; - - /* - * we have to unlock the pages after updating i_size, otherwise - * we race with writepage - */ - for ( i = 0; i < num_pages ; i++) { - struct page *page=prepared_pages[i]; - unlock_page(page); - mark_page_accessed(page); - page_cache_release(page); - } - return retval; + /* + * we have to unlock the pages after updating i_size, otherwise + * we race with writepage + */ + for (i = 0; i < num_pages; i++) { + struct page *page = prepared_pages[i]; + unlock_page(page); + mark_page_accessed(page); + page_cache_release(page); + } + return retval; } /* Look if passed writing region is going to touch file's tail (if it is present). And if it is, convert the tail to unformatted node */ -static int reiserfs_check_for_tail_and_convert( struct inode *inode, /* inode to deal with */ - loff_t pos, /* Writing position */ - int write_bytes /* amount of bytes to write */ - ) +static int reiserfs_check_for_tail_and_convert(struct inode *inode, /* inode to deal with */ + loff_t pos, /* Writing position */ + int write_bytes /* amount of bytes to write */ + ) { - INITIALIZE_PATH(path); // needed for search_for_position - struct cpu_key key; // Key that would represent last touched writing byte. - struct item_head *ih; // item header of found block; - int res; // Return value of various functions we call. - int cont_expand_offset; // We will put offset for generic_cont_expand here - // This can be int just because tails are created - // only for small files. - + INITIALIZE_PATH(path); // needed for search_for_position + struct cpu_key key; // Key that would represent last touched writing byte. + struct item_head *ih; // item header of found block; + int res; // Return value of various functions we call. + int cont_expand_offset; // We will put offset for generic_cont_expand here + // This can be int just because tails are created + // only for small files. + /* this embodies a dependency on a particular tail policy */ - if ( inode->i_size >= inode->i_sb->s_blocksize*4 ) { - /* such a big files do not have tails, so we won't bother ourselves - to look for tails, simply return */ - return 0; - } - - reiserfs_write_lock(inode->i_sb); - /* find the item containing the last byte to be written, or if - * writing past the end of the file then the last item of the - * file (and then we check its type). */ - make_cpu_key (&key, inode, pos+write_bytes+1, TYPE_ANY, 3/*key length*/); - res = search_for_position_by_key(inode->i_sb, &key, &path); - if ( res == IO_ERROR ) { - reiserfs_write_unlock(inode->i_sb); - return -EIO; - } - ih = get_ih(&path); - res = 0; - if ( is_direct_le_ih(ih) ) { - /* Ok, closest item is file tail (tails are stored in "direct" - * items), so we need to unpack it. */ - /* To not overcomplicate matters, we just call generic_cont_expand - which will in turn call other stuff and finally will boil down to - reiserfs_get_block() that would do necessary conversion. */ - cont_expand_offset = le_key_k_offset(get_inode_item_key_version(inode), &(ih->ih_key)); - pathrelse(&path); - res = generic_cont_expand( inode, cont_expand_offset); - } else - pathrelse(&path); + if (inode->i_size >= inode->i_sb->s_blocksize * 4) { + /* such a big files do not have tails, so we won't bother ourselves + to look for tails, simply return */ + return 0; + } - reiserfs_write_unlock(inode->i_sb); - return res; + reiserfs_write_lock(inode->i_sb); + /* find the item containing the last byte to be written, or if + * writing past the end of the file then the last item of the + * file (and then we check its type). */ + make_cpu_key(&key, inode, pos + write_bytes + 1, TYPE_ANY, + 3 /*key length */ ); + res = search_for_position_by_key(inode->i_sb, &key, &path); + if (res == IO_ERROR) { + reiserfs_write_unlock(inode->i_sb); + return -EIO; + } + ih = get_ih(&path); + res = 0; + if (is_direct_le_ih(ih)) { + /* Ok, closest item is file tail (tails are stored in "direct" + * items), so we need to unpack it. */ + /* To not overcomplicate matters, we just call generic_cont_expand + which will in turn call other stuff and finally will boil down to + reiserfs_get_block() that would do necessary conversion. */ + cont_expand_offset = + le_key_k_offset(get_inode_item_key_version(inode), + &(ih->ih_key)); + pathrelse(&path); + res = generic_cont_expand(inode, cont_expand_offset); + } else + pathrelse(&path); + + reiserfs_write_unlock(inode->i_sb); + return res; } /* This function locks pages starting from @pos for @inode. @@ -851,275 +947,296 @@ static int reiserfs_check_for_tail_and_convert( struct inode *inode, /* inode to append), it is zeroed, then. Returns number of unallocated blocks that should be allocated to cover new file data.*/ -static int reiserfs_prepare_file_region_for_write( - struct inode *inode /* Inode of the file */, - loff_t pos, /* position in the file */ - size_t num_pages, /* number of pages to - prepare */ - size_t write_bytes, /* Amount of bytes to be - overwritten from - @pos */ - struct page **prepared_pages /* pointer to array - where to store - prepared pages */ - ) +static int reiserfs_prepare_file_region_for_write(struct inode *inode + /* Inode of the file */ , + loff_t pos, /* position in the file */ + size_t num_pages, /* number of pages to + prepare */ + size_t write_bytes, /* Amount of bytes to be + overwritten from + @pos */ + struct page **prepared_pages /* pointer to array + where to store + prepared pages */ + ) { - int res=0; // Return values of different functions we call. - unsigned long index = pos >> PAGE_CACHE_SHIFT; // Offset in file in pages. - int from = (pos & (PAGE_CACHE_SIZE - 1)); // Writing offset in first page - int to = ((pos + write_bytes - 1) & (PAGE_CACHE_SIZE - 1)) + 1; - /* offset of last modified byte in last - page */ - struct address_space *mapping = inode->i_mapping; // Pages are mapped here. - int i; // Simple counter - int blocks = 0; /* Return value (blocks that should be allocated) */ - struct buffer_head *bh, *head; // Current bufferhead and first bufferhead - // of a page. - unsigned block_start, block_end; // Starting and ending offsets of current - // buffer in the page. - struct buffer_head *wait[2], **wait_bh=wait; // Buffers for page, if - // Page appeared to be not up - // to date. Note how we have - // at most 2 buffers, this is - // because we at most may - // partially overwrite two - // buffers for one page. One at // the beginning of write area - // and one at the end. - // Everything inthe middle gets // overwritten totally. - - struct cpu_key key; // cpu key of item that we are going to deal with - struct item_head *ih = NULL; // pointer to item head that we are going to deal with - struct buffer_head *itembuf=NULL; // Buffer head that contains items that we are going to deal with - INITIALIZE_PATH(path); // path to item, that we are going to deal with. - __le32 * item=NULL; // pointer to item we are going to deal with - int item_pos=-1; /* Position in indirect item */ - - - if ( num_pages < 1 ) { - reiserfs_warning (inode->i_sb, - "green-9001: reiserfs_prepare_file_region_for_write " - "called with zero number of pages to process"); - return -EFAULT; - } - - /* We have 2 loops for pages. In first loop we grab and lock the pages, so - that nobody would touch these until we release the pages. Then - we'd start to deal with mapping buffers to blocks. */ - for ( i = 0; i < num_pages; i++) { - prepared_pages[i] = grab_cache_page(mapping, index + i); // locks the page - if ( !prepared_pages[i]) { - res = -ENOMEM; - goto failed_page_grabbing; - } - if (!page_has_buffers(prepared_pages[i])) - create_empty_buffers(prepared_pages[i], inode->i_sb->s_blocksize, 0); - } - - /* Let's count amount of blocks for a case where all the blocks - overwritten are new (we will substract already allocated blocks later)*/ - if ( num_pages > 2 ) - /* These are full-overwritten pages so we count all the blocks in - these pages are counted as needed to be allocated */ - blocks = (num_pages - 2) << (PAGE_CACHE_SHIFT - inode->i_blkbits); - - /* count blocks needed for first page (possibly partially written) */ - blocks += ((PAGE_CACHE_SIZE - from) >> inode->i_blkbits) + - !!(from & (inode->i_sb->s_blocksize-1)); /* roundup */ - - /* Now we account for last page. If last page == first page (we - overwrite only one page), we substract all the blocks past the - last writing position in a page out of already calculated number - of blocks */ - blocks += ((num_pages > 1) << (PAGE_CACHE_SHIFT-inode->i_blkbits)) - - ((PAGE_CACHE_SIZE - to) >> inode->i_blkbits); - /* Note how we do not roundup here since partial blocks still - should be allocated */ - - /* Now if all the write area lies past the file end, no point in - maping blocks, since there is none, so we just zero out remaining - parts of first and last pages in write area (if needed) */ - if ( (pos & ~((loff_t)PAGE_CACHE_SIZE - 1)) > inode->i_size ) { - if ( from != 0 ) {/* First page needs to be partially zeroed */ - char *kaddr = kmap_atomic(prepared_pages[0], KM_USER0); - memset(kaddr, 0, from); - kunmap_atomic( kaddr, KM_USER0); - } - if ( to != PAGE_CACHE_SIZE ) { /* Last page needs to be partially zeroed */ - char *kaddr = kmap_atomic(prepared_pages[num_pages-1], KM_USER0); - memset(kaddr+to, 0, PAGE_CACHE_SIZE - to); - kunmap_atomic( kaddr, KM_USER0); + int res = 0; // Return values of different functions we call. + unsigned long index = pos >> PAGE_CACHE_SHIFT; // Offset in file in pages. + int from = (pos & (PAGE_CACHE_SIZE - 1)); // Writing offset in first page + int to = ((pos + write_bytes - 1) & (PAGE_CACHE_SIZE - 1)) + 1; + /* offset of last modified byte in last + page */ + struct address_space *mapping = inode->i_mapping; // Pages are mapped here. + int i; // Simple counter + int blocks = 0; /* Return value (blocks that should be allocated) */ + struct buffer_head *bh, *head; // Current bufferhead and first bufferhead + // of a page. + unsigned block_start, block_end; // Starting and ending offsets of current + // buffer in the page. + struct buffer_head *wait[2], **wait_bh = wait; // Buffers for page, if + // Page appeared to be not up + // to date. Note how we have + // at most 2 buffers, this is + // because we at most may + // partially overwrite two + // buffers for one page. One at // the beginning of write area + // and one at the end. + // Everything inthe middle gets // overwritten totally. + + struct cpu_key key; // cpu key of item that we are going to deal with + struct item_head *ih = NULL; // pointer to item head that we are going to deal with + struct buffer_head *itembuf = NULL; // Buffer head that contains items that we are going to deal with + INITIALIZE_PATH(path); // path to item, that we are going to deal with. + __le32 *item = NULL; // pointer to item we are going to deal with + int item_pos = -1; /* Position in indirect item */ + + if (num_pages < 1) { + reiserfs_warning(inode->i_sb, + "green-9001: reiserfs_prepare_file_region_for_write " + "called with zero number of pages to process"); + return -EFAULT; } - /* Since all blocks are new - use already calculated value */ - return blocks; - } - - /* Well, since we write somewhere into the middle of a file, there is - possibility we are writing over some already allocated blocks, so - let's map these blocks and substract number of such blocks out of blocks - we need to allocate (calculated above) */ - /* Mask write position to start on blocksize, we do it out of the - loop for performance reasons */ - pos &= ~((loff_t) inode->i_sb->s_blocksize - 1); - /* Set cpu key to the starting position in a file (on left block boundary)*/ - make_cpu_key (&key, inode, 1 + ((pos) & ~((loff_t) inode->i_sb->s_blocksize - 1)), TYPE_ANY, 3/*key length*/); - - reiserfs_write_lock(inode->i_sb); // We need that for at least search_by_key() - for ( i = 0; i < num_pages ; i++ ) { - - head = page_buffers(prepared_pages[i]); - /* For each buffer in the page */ - for(bh = head, block_start = 0; bh != head || !block_start; - block_start=block_end, bh = bh->b_this_page) { - if (!bh) - reiserfs_panic(inode->i_sb, "green-9002: Allocated but absent buffer for a page?"); - /* Find where this buffer ends */ - block_end = block_start+inode->i_sb->s_blocksize; - if (i == 0 && block_end <= from ) - /* if this buffer is before requested data to map, skip it*/ - continue; - - if (i == num_pages - 1 && block_start >= to) { - /* If this buffer is after requested data to map, abort - processing of current page */ - break; + /* We have 2 loops for pages. In first loop we grab and lock the pages, so + that nobody would touch these until we release the pages. Then + we'd start to deal with mapping buffers to blocks. */ + for (i = 0; i < num_pages; i++) { + prepared_pages[i] = grab_cache_page(mapping, index + i); // locks the page + if (!prepared_pages[i]) { + res = -ENOMEM; + goto failed_page_grabbing; } + if (!page_has_buffers(prepared_pages[i])) + create_empty_buffers(prepared_pages[i], + inode->i_sb->s_blocksize, 0); + } - if ( buffer_mapped(bh) && bh->b_blocknr !=0 ) { - /* This is optimisation for a case where buffer is mapped - and have blocknumber assigned. In case significant amount - of such buffers are present, we may avoid some amount - of search_by_key calls. - Probably it would be possible to move parts of this code - out of BKL, but I afraid that would overcomplicate code - without any noticeable benefit. - */ - item_pos++; - /* Update the key */ - set_cpu_key_k_offset( &key, cpu_key_k_offset(&key) + inode->i_sb->s_blocksize); - blocks--; // Decrease the amount of blocks that need to be - // allocated - continue; // Go to the next buffer + /* Let's count amount of blocks for a case where all the blocks + overwritten are new (we will substract already allocated blocks later) */ + if (num_pages > 2) + /* These are full-overwritten pages so we count all the blocks in + these pages are counted as needed to be allocated */ + blocks = + (num_pages - 2) << (PAGE_CACHE_SHIFT - inode->i_blkbits); + + /* count blocks needed for first page (possibly partially written) */ + blocks += ((PAGE_CACHE_SIZE - from) >> inode->i_blkbits) + !!(from & (inode->i_sb->s_blocksize - 1)); /* roundup */ + + /* Now we account for last page. If last page == first page (we + overwrite only one page), we substract all the blocks past the + last writing position in a page out of already calculated number + of blocks */ + blocks += ((num_pages > 1) << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - + ((PAGE_CACHE_SIZE - to) >> inode->i_blkbits); + /* Note how we do not roundup here since partial blocks still + should be allocated */ + + /* Now if all the write area lies past the file end, no point in + maping blocks, since there is none, so we just zero out remaining + parts of first and last pages in write area (if needed) */ + if ((pos & ~((loff_t) PAGE_CACHE_SIZE - 1)) > inode->i_size) { + if (from != 0) { /* First page needs to be partially zeroed */ + char *kaddr = kmap_atomic(prepared_pages[0], KM_USER0); + memset(kaddr, 0, from); + kunmap_atomic(kaddr, KM_USER0); + } + if (to != PAGE_CACHE_SIZE) { /* Last page needs to be partially zeroed */ + char *kaddr = + kmap_atomic(prepared_pages[num_pages - 1], + KM_USER0); + memset(kaddr + to, 0, PAGE_CACHE_SIZE - to); + kunmap_atomic(kaddr, KM_USER0); } - if ( !itembuf || /* if first iteration */ - item_pos >= ih_item_len(ih)/UNFM_P_SIZE) - { /* or if we progressed past the - current unformatted_item */ - /* Try to find next item */ - res = search_for_position_by_key(inode->i_sb, &key, &path); - /* Abort if no more items */ - if ( res != POSITION_FOUND ) { - /* make sure later loops don't use this item */ - itembuf = NULL; - item = NULL; - break; + /* Since all blocks are new - use already calculated value */ + return blocks; + } + + /* Well, since we write somewhere into the middle of a file, there is + possibility we are writing over some already allocated blocks, so + let's map these blocks and substract number of such blocks out of blocks + we need to allocate (calculated above) */ + /* Mask write position to start on blocksize, we do it out of the + loop for performance reasons */ + pos &= ~((loff_t) inode->i_sb->s_blocksize - 1); + /* Set cpu key to the starting position in a file (on left block boundary) */ + make_cpu_key(&key, inode, + 1 + ((pos) & ~((loff_t) inode->i_sb->s_blocksize - 1)), + TYPE_ANY, 3 /*key length */ ); + + reiserfs_write_lock(inode->i_sb); // We need that for at least search_by_key() + for (i = 0; i < num_pages; i++) { + + head = page_buffers(prepared_pages[i]); + /* For each buffer in the page */ + for (bh = head, block_start = 0; bh != head || !block_start; + block_start = block_end, bh = bh->b_this_page) { + if (!bh) + reiserfs_panic(inode->i_sb, + "green-9002: Allocated but absent buffer for a page?"); + /* Find where this buffer ends */ + block_end = block_start + inode->i_sb->s_blocksize; + if (i == 0 && block_end <= from) + /* if this buffer is before requested data to map, skip it */ + continue; + + if (i == num_pages - 1 && block_start >= to) { + /* If this buffer is after requested data to map, abort + processing of current page */ + break; } - /* Update information about current indirect item */ - itembuf = get_last_bh( &path ); - ih = get_ih( &path ); - item = get_item( &path ); - item_pos = path.pos_in_item; + if (buffer_mapped(bh) && bh->b_blocknr != 0) { + /* This is optimisation for a case where buffer is mapped + and have blocknumber assigned. In case significant amount + of such buffers are present, we may avoid some amount + of search_by_key calls. + Probably it would be possible to move parts of this code + out of BKL, but I afraid that would overcomplicate code + without any noticeable benefit. + */ + item_pos++; + /* Update the key */ + set_cpu_key_k_offset(&key, + cpu_key_k_offset(&key) + + inode->i_sb->s_blocksize); + blocks--; // Decrease the amount of blocks that need to be + // allocated + continue; // Go to the next buffer + } - RFALSE( !is_indirect_le_ih (ih), "green-9003: indirect item expected"); - } + if (!itembuf || /* if first iteration */ + item_pos >= ih_item_len(ih) / UNFM_P_SIZE) { /* or if we progressed past the + current unformatted_item */ + /* Try to find next item */ + res = + search_for_position_by_key(inode->i_sb, + &key, &path); + /* Abort if no more items */ + if (res != POSITION_FOUND) { + /* make sure later loops don't use this item */ + itembuf = NULL; + item = NULL; + break; + } + + /* Update information about current indirect item */ + itembuf = get_last_bh(&path); + ih = get_ih(&path); + item = get_item(&path); + item_pos = path.pos_in_item; + + RFALSE(!is_indirect_le_ih(ih), + "green-9003: indirect item expected"); + } - /* See if there is some block associated with the file - at that position, map the buffer to this block */ - if ( get_block_num(item,item_pos) ) { - map_bh(bh, inode->i_sb, get_block_num(item,item_pos)); - blocks--; // Decrease the amount of blocks that need to be - // allocated + /* See if there is some block associated with the file + at that position, map the buffer to this block */ + if (get_block_num(item, item_pos)) { + map_bh(bh, inode->i_sb, + get_block_num(item, item_pos)); + blocks--; // Decrease the amount of blocks that need to be + // allocated + } + item_pos++; + /* Update the key */ + set_cpu_key_k_offset(&key, + cpu_key_k_offset(&key) + + inode->i_sb->s_blocksize); } - item_pos++; - /* Update the key */ - set_cpu_key_k_offset( &key, cpu_key_k_offset(&key) + inode->i_sb->s_blocksize); } - } - pathrelse(&path); // Free the path - reiserfs_write_unlock(inode->i_sb); + pathrelse(&path); // Free the path + reiserfs_write_unlock(inode->i_sb); /* Now zero out unmappend buffers for the first and last pages of write area or issue read requests if page is mapped. */ /* First page, see if it is not uptodate */ - if ( !PageUptodate(prepared_pages[0]) ) { - head = page_buffers(prepared_pages[0]); - - /* For each buffer in page */ - for(bh = head, block_start = 0; bh != head || !block_start; - block_start=block_end, bh = bh->b_this_page) { - - if (!bh) - reiserfs_panic(inode->i_sb, "green-9002: Allocated but absent buffer for a page?"); - /* Find where this buffer ends */ - block_end = block_start+inode->i_sb->s_blocksize; - if ( block_end <= from ) - /* if this buffer is before requested data to map, skip it*/ - continue; - if ( block_start < from ) { /* Aha, our partial buffer */ - if ( buffer_mapped(bh) ) { /* If it is mapped, we need to - issue READ request for it to - not loose data */ - ll_rw_block(READ, 1, &bh); - *wait_bh++=bh; - } else { /* Not mapped, zero it */ - char *kaddr = kmap_atomic(prepared_pages[0], KM_USER0); - memset(kaddr+block_start, 0, from-block_start); - kunmap_atomic( kaddr, KM_USER0); - set_buffer_uptodate(bh); - } + if (!PageUptodate(prepared_pages[0])) { + head = page_buffers(prepared_pages[0]); + + /* For each buffer in page */ + for (bh = head, block_start = 0; bh != head || !block_start; + block_start = block_end, bh = bh->b_this_page) { + + if (!bh) + reiserfs_panic(inode->i_sb, + "green-9002: Allocated but absent buffer for a page?"); + /* Find where this buffer ends */ + block_end = block_start + inode->i_sb->s_blocksize; + if (block_end <= from) + /* if this buffer is before requested data to map, skip it */ + continue; + if (block_start < from) { /* Aha, our partial buffer */ + if (buffer_mapped(bh)) { /* If it is mapped, we need to + issue READ request for it to + not loose data */ + ll_rw_block(READ, 1, &bh); + *wait_bh++ = bh; + } else { /* Not mapped, zero it */ + char *kaddr = + kmap_atomic(prepared_pages[0], + KM_USER0); + memset(kaddr + block_start, 0, + from - block_start); + kunmap_atomic(kaddr, KM_USER0); + set_buffer_uptodate(bh); + } + } } - } } /* Last page, see if it is not uptodate, or if the last page is past the end of the file. */ - if ( !PageUptodate(prepared_pages[num_pages-1]) || - ((pos+write_bytes)>>PAGE_CACHE_SHIFT) > (inode->i_size>>PAGE_CACHE_SHIFT) ) { - head = page_buffers(prepared_pages[num_pages-1]); - - /* for each buffer in page */ - for(bh = head, block_start = 0; bh != head || !block_start; - block_start=block_end, bh = bh->b_this_page) { - - if (!bh) - reiserfs_panic(inode->i_sb, "green-9002: Allocated but absent buffer for a page?"); - /* Find where this buffer ends */ - block_end = block_start+inode->i_sb->s_blocksize; - if ( block_start >= to ) - /* if this buffer is after requested data to map, skip it*/ - break; - if ( block_end > to ) { /* Aha, our partial buffer */ - if ( buffer_mapped(bh) ) { /* If it is mapped, we need to - issue READ request for it to - not loose data */ - ll_rw_block(READ, 1, &bh); - *wait_bh++=bh; - } else { /* Not mapped, zero it */ - char *kaddr = kmap_atomic(prepared_pages[num_pages-1], KM_USER0); - memset(kaddr+to, 0, block_end-to); - kunmap_atomic( kaddr, KM_USER0); - set_buffer_uptodate(bh); - } + if (!PageUptodate(prepared_pages[num_pages - 1]) || + ((pos + write_bytes) >> PAGE_CACHE_SHIFT) > + (inode->i_size >> PAGE_CACHE_SHIFT)) { + head = page_buffers(prepared_pages[num_pages - 1]); + + /* for each buffer in page */ + for (bh = head, block_start = 0; bh != head || !block_start; + block_start = block_end, bh = bh->b_this_page) { + + if (!bh) + reiserfs_panic(inode->i_sb, + "green-9002: Allocated but absent buffer for a page?"); + /* Find where this buffer ends */ + block_end = block_start + inode->i_sb->s_blocksize; + if (block_start >= to) + /* if this buffer is after requested data to map, skip it */ + break; + if (block_end > to) { /* Aha, our partial buffer */ + if (buffer_mapped(bh)) { /* If it is mapped, we need to + issue READ request for it to + not loose data */ + ll_rw_block(READ, 1, &bh); + *wait_bh++ = bh; + } else { /* Not mapped, zero it */ + char *kaddr = + kmap_atomic(prepared_pages + [num_pages - 1], + KM_USER0); + memset(kaddr + to, 0, block_end - to); + kunmap_atomic(kaddr, KM_USER0); + set_buffer_uptodate(bh); + } + } } - } } - /* Wait for read requests we made to happen, if necessary */ - while(wait_bh > wait) { - wait_on_buffer(*--wait_bh); - if (!buffer_uptodate(*wait_bh)) { - res = -EIO; - goto failed_read; + /* Wait for read requests we made to happen, if necessary */ + while (wait_bh > wait) { + wait_on_buffer(*--wait_bh); + if (!buffer_uptodate(*wait_bh)) { + res = -EIO; + goto failed_read; + } } - } - - return blocks; -failed_page_grabbing: - num_pages = i; -failed_read: - reiserfs_unprepare_pages(prepared_pages, num_pages); - return res; + + return blocks; + failed_page_grabbing: + num_pages = i; + failed_read: + reiserfs_unprepare_pages(prepared_pages, num_pages); + return res; } /* Write @count bytes at position @ppos in a file indicated by @file @@ -1148,262 +1265,305 @@ failed_read: Future Features: providing search_by_key with hints. */ -static ssize_t reiserfs_file_write( struct file *file, /* the file we are going to write into */ - const char __user *buf, /* pointer to user supplied data -(in userspace) */ - size_t count, /* amount of bytes to write */ - loff_t *ppos /* pointer to position in file that we start writing at. Should be updated to - * new current position before returning. */ ) +static ssize_t reiserfs_file_write(struct file *file, /* the file we are going to write into */ + const char __user * buf, /* pointer to user supplied data + (in userspace) */ + size_t count, /* amount of bytes to write */ + loff_t * ppos /* pointer to position in file that we start writing at. Should be updated to + * new current position before returning. */ + ) { - size_t already_written = 0; // Number of bytes already written to the file. - loff_t pos; // Current position in the file. - ssize_t res; // return value of various functions that we call. - int err = 0; - struct inode *inode = file->f_dentry->d_inode; // Inode of the file that we are writing to. - /* To simplify coding at this time, we store - locked pages in array for now */ - struct page * prepared_pages[REISERFS_WRITE_PAGES_AT_A_TIME]; - struct reiserfs_transaction_handle th; - th.t_trans_id = 0; - - if ( file->f_flags & O_DIRECT) { // Direct IO needs treatment - ssize_t result, after_file_end = 0; - if ( (*ppos + count >= inode->i_size) || (file->f_flags & O_APPEND) ) { - /* If we are appending a file, we need to put this savelink in here. - If we will crash while doing direct io, finish_unfinished will - cut the garbage from the file end. */ - reiserfs_write_lock(inode->i_sb); - err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT ); - if (err) { - reiserfs_write_unlock (inode->i_sb); - return err; - } - reiserfs_update_inode_transaction(inode); - add_save_link (&th, inode, 1 /* Truncate */); - after_file_end = 1; - err = journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT ); - reiserfs_write_unlock(inode->i_sb); - if (err) - return err; - } - result = generic_file_write(file, buf, count, ppos); - - if ( after_file_end ) { /* Now update i_size and remove the savelink */ - struct reiserfs_transaction_handle th; - reiserfs_write_lock(inode->i_sb); - err = journal_begin(&th, inode->i_sb, 1); - if (err) { - reiserfs_write_unlock (inode->i_sb); - return err; - } - reiserfs_update_inode_transaction(inode); - reiserfs_update_sd(&th, inode); - err = journal_end(&th, inode->i_sb, 1); - if (err) { - reiserfs_write_unlock (inode->i_sb); - return err; - } - err = remove_save_link (inode, 1/* truncate */); - reiserfs_write_unlock(inode->i_sb); - if (err) - return err; - } - - return result; - } - - if ( unlikely((ssize_t) count < 0 )) - return -EINVAL; - - if (unlikely(!access_ok(VERIFY_READ, buf, count))) - return -EFAULT; - - down(&inode->i_sem); // locks the entire file for just us - - pos = *ppos; - - /* Check if we can write to specified region of file, file - is not overly big and this kind of stuff. Adjust pos and - count, if needed */ - res = generic_write_checks(file, &pos, &count, 0); - if (res) - goto out; - - if ( count == 0 ) - goto out; - - res = remove_suid(file->f_dentry); - if (res) - goto out; - - inode_update_time(inode, 1); /* Both mtime and ctime */ - - // Ok, we are done with all the checks. + size_t already_written = 0; // Number of bytes already written to the file. + loff_t pos; // Current position in the file. + ssize_t res; // return value of various functions that we call. + int err = 0; + struct inode *inode = file->f_dentry->d_inode; // Inode of the file that we are writing to. + /* To simplify coding at this time, we store + locked pages in array for now */ + struct page *prepared_pages[REISERFS_WRITE_PAGES_AT_A_TIME]; + struct reiserfs_transaction_handle th; + th.t_trans_id = 0; + + if (file->f_flags & O_DIRECT) { // Direct IO needs treatment + ssize_t result, after_file_end = 0; + if ((*ppos + count >= inode->i_size) + || (file->f_flags & O_APPEND)) { + /* If we are appending a file, we need to put this savelink in here. + If we will crash while doing direct io, finish_unfinished will + cut the garbage from the file end. */ + reiserfs_write_lock(inode->i_sb); + err = + journal_begin(&th, inode->i_sb, + JOURNAL_PER_BALANCE_CNT); + if (err) { + reiserfs_write_unlock(inode->i_sb); + return err; + } + reiserfs_update_inode_transaction(inode); + add_save_link(&th, inode, 1 /* Truncate */ ); + after_file_end = 1; + err = + journal_end(&th, inode->i_sb, + JOURNAL_PER_BALANCE_CNT); + reiserfs_write_unlock(inode->i_sb); + if (err) + return err; + } + result = generic_file_write(file, buf, count, ppos); + + if (after_file_end) { /* Now update i_size and remove the savelink */ + struct reiserfs_transaction_handle th; + reiserfs_write_lock(inode->i_sb); + err = journal_begin(&th, inode->i_sb, 1); + if (err) { + reiserfs_write_unlock(inode->i_sb); + return err; + } + reiserfs_update_inode_transaction(inode); + reiserfs_update_sd(&th, inode); + err = journal_end(&th, inode->i_sb, 1); + if (err) { + reiserfs_write_unlock(inode->i_sb); + return err; + } + err = remove_save_link(inode, 1 /* truncate */ ); + reiserfs_write_unlock(inode->i_sb); + if (err) + return err; + } - // Now we should start real work + return result; + } - /* If we are going to write past the file's packed tail or if we are going - to overwrite part of the tail, we need that tail to be converted into - unformatted node */ - res = reiserfs_check_for_tail_and_convert( inode, pos, count); - if (res) - goto out; + if (unlikely((ssize_t) count < 0)) + return -EINVAL; + + if (unlikely(!access_ok(VERIFY_READ, buf, count))) + return -EFAULT; + + down(&inode->i_sem); // locks the entire file for just us + + pos = *ppos; + + /* Check if we can write to specified region of file, file + is not overly big and this kind of stuff. Adjust pos and + count, if needed */ + res = generic_write_checks(file, &pos, &count, 0); + if (res) + goto out; + + if (count == 0) + goto out; + + res = remove_suid(file->f_dentry); + if (res) + goto out; + + inode_update_time(inode, 1); /* Both mtime and ctime */ + + // Ok, we are done with all the checks. + + // Now we should start real work + + /* If we are going to write past the file's packed tail or if we are going + to overwrite part of the tail, we need that tail to be converted into + unformatted node */ + res = reiserfs_check_for_tail_and_convert(inode, pos, count); + if (res) + goto out; + + while (count > 0) { + /* This is the main loop in which we running until some error occures + or until we write all of the data. */ + size_t num_pages; /* amount of pages we are going to write this iteration */ + size_t write_bytes; /* amount of bytes to write during this iteration */ + size_t blocks_to_allocate; /* how much blocks we need to allocate for this iteration */ + + /* (pos & (PAGE_CACHE_SIZE-1)) is an idiom for offset into a page of pos */ + num_pages = !!((pos + count) & (PAGE_CACHE_SIZE - 1)) + /* round up partial + pages */ + ((count + + (pos & (PAGE_CACHE_SIZE - 1))) >> PAGE_CACHE_SHIFT); + /* convert size to amount of + pages */ + reiserfs_write_lock(inode->i_sb); + if (num_pages > REISERFS_WRITE_PAGES_AT_A_TIME + || num_pages > reiserfs_can_fit_pages(inode->i_sb)) { + /* If we were asked to write more data than we want to or if there + is not that much space, then we shorten amount of data to write + for this iteration. */ + num_pages = + min_t(size_t, REISERFS_WRITE_PAGES_AT_A_TIME, + reiserfs_can_fit_pages(inode->i_sb)); + /* Also we should not forget to set size in bytes accordingly */ + write_bytes = (num_pages << PAGE_CACHE_SHIFT) - + (pos & (PAGE_CACHE_SIZE - 1)); + /* If position is not on the + start of the page, we need + to substract the offset + within page */ + } else + write_bytes = count; + + /* reserve the blocks to be allocated later, so that later on + we still have the space to write the blocks to */ + reiserfs_claim_blocks_to_be_allocated(inode->i_sb, + num_pages << + (PAGE_CACHE_SHIFT - + inode->i_blkbits)); + reiserfs_write_unlock(inode->i_sb); + + if (!num_pages) { /* If we do not have enough space even for a single page... */ + if (pos > + inode->i_size + inode->i_sb->s_blocksize - + (pos & (inode->i_sb->s_blocksize - 1))) { + res = -ENOSPC; + break; // In case we are writing past the end of the last file block, break. + } + // Otherwise we are possibly overwriting the file, so + // let's set write size to be equal or less than blocksize. + // This way we get it correctly for file holes. + // But overwriting files on absolutelly full volumes would not + // be very efficient. Well, people are not supposed to fill + // 100% of disk space anyway. + write_bytes = + min_t(size_t, count, + inode->i_sb->s_blocksize - + (pos & (inode->i_sb->s_blocksize - 1))); + num_pages = 1; + // No blocks were claimed before, so do it now. + reiserfs_claim_blocks_to_be_allocated(inode->i_sb, + 1 << + (PAGE_CACHE_SHIFT + - + inode-> + i_blkbits)); + } - while ( count > 0) { - /* This is the main loop in which we running until some error occures - or until we write all of the data. */ - size_t num_pages;/* amount of pages we are going to write this iteration */ - size_t write_bytes; /* amount of bytes to write during this iteration */ - size_t blocks_to_allocate; /* how much blocks we need to allocate for this iteration */ - - /* (pos & (PAGE_CACHE_SIZE-1)) is an idiom for offset into a page of pos*/ - num_pages = !!((pos+count) & (PAGE_CACHE_SIZE - 1)) + /* round up partial - pages */ - ((count + (pos & (PAGE_CACHE_SIZE-1))) >> PAGE_CACHE_SHIFT); - /* convert size to amount of - pages */ - reiserfs_write_lock(inode->i_sb); - if ( num_pages > REISERFS_WRITE_PAGES_AT_A_TIME - || num_pages > reiserfs_can_fit_pages(inode->i_sb) ) { - /* If we were asked to write more data than we want to or if there - is not that much space, then we shorten amount of data to write - for this iteration. */ - num_pages = min_t(size_t, REISERFS_WRITE_PAGES_AT_A_TIME, reiserfs_can_fit_pages(inode->i_sb)); - /* Also we should not forget to set size in bytes accordingly */ - write_bytes = (num_pages << PAGE_CACHE_SHIFT) - - (pos & (PAGE_CACHE_SIZE-1)); - /* If position is not on the - start of the page, we need - to substract the offset - within page */ - } else - write_bytes = count; + /* Prepare for writing into the region, read in all the + partially overwritten pages, if needed. And lock the pages, + so that nobody else can access these until we are done. + We get number of actual blocks needed as a result. */ + blocks_to_allocate = + reiserfs_prepare_file_region_for_write(inode, pos, + num_pages, + write_bytes, + prepared_pages); + if (blocks_to_allocate < 0) { + res = blocks_to_allocate; + reiserfs_release_claimed_blocks(inode->i_sb, + num_pages << + (PAGE_CACHE_SHIFT - + inode->i_blkbits)); + break; + } - /* reserve the blocks to be allocated later, so that later on - we still have the space to write the blocks to */ - reiserfs_claim_blocks_to_be_allocated(inode->i_sb, num_pages << (PAGE_CACHE_SHIFT - inode->i_blkbits)); - reiserfs_write_unlock(inode->i_sb); + /* First we correct our estimate of how many blocks we need */ + reiserfs_release_claimed_blocks(inode->i_sb, + (num_pages << + (PAGE_CACHE_SHIFT - + inode->i_sb-> + s_blocksize_bits)) - + blocks_to_allocate); + + if (blocks_to_allocate > 0) { /*We only allocate blocks if we need to */ + /* Fill in all the possible holes and append the file if needed */ + res = + reiserfs_allocate_blocks_for_region(&th, inode, pos, + num_pages, + write_bytes, + prepared_pages, + blocks_to_allocate); + } - if ( !num_pages ) { /* If we do not have enough space even for a single page... */ - if ( pos > inode->i_size+inode->i_sb->s_blocksize-(pos & (inode->i_sb->s_blocksize-1))) { - res = -ENOSPC; - break; // In case we are writing past the end of the last file block, break. - } - // Otherwise we are possibly overwriting the file, so - // let's set write size to be equal or less than blocksize. - // This way we get it correctly for file holes. - // But overwriting files on absolutelly full volumes would not - // be very efficient. Well, people are not supposed to fill - // 100% of disk space anyway. - write_bytes = min_t(size_t, count, inode->i_sb->s_blocksize - (pos & (inode->i_sb->s_blocksize - 1))); - num_pages = 1; - // No blocks were claimed before, so do it now. - reiserfs_claim_blocks_to_be_allocated(inode->i_sb, 1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)); - } + /* well, we have allocated the blocks, so it is time to free + the reservation we made earlier. */ + reiserfs_release_claimed_blocks(inode->i_sb, + blocks_to_allocate); + if (res) { + reiserfs_unprepare_pages(prepared_pages, num_pages); + break; + } - /* Prepare for writing into the region, read in all the - partially overwritten pages, if needed. And lock the pages, - so that nobody else can access these until we are done. - We get number of actual blocks needed as a result.*/ - blocks_to_allocate = reiserfs_prepare_file_region_for_write(inode, pos, num_pages, write_bytes, prepared_pages); - if ( blocks_to_allocate < 0 ) { - res = blocks_to_allocate; - reiserfs_release_claimed_blocks(inode->i_sb, num_pages << (PAGE_CACHE_SHIFT - inode->i_blkbits)); - break; - } +/* NOTE that allocating blocks and filling blocks can be done in reverse order + and probably we would do that just to get rid of garbage in files after a + crash */ - /* First we correct our estimate of how many blocks we need */ - reiserfs_release_claimed_blocks(inode->i_sb, (num_pages << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits)) - blocks_to_allocate ); + /* Copy data from user-supplied buffer to file's pages */ + res = + reiserfs_copy_from_user_to_file_region(pos, num_pages, + write_bytes, + prepared_pages, buf); + if (res) { + reiserfs_unprepare_pages(prepared_pages, num_pages); + break; + } - if ( blocks_to_allocate > 0) {/*We only allocate blocks if we need to*/ - /* Fill in all the possible holes and append the file if needed */ - res = reiserfs_allocate_blocks_for_region(&th, inode, pos, num_pages, write_bytes, prepared_pages, blocks_to_allocate); + /* Send the pages to disk and unlock them. */ + res = + reiserfs_submit_file_region_for_write(&th, inode, pos, + num_pages, + write_bytes, + prepared_pages); + if (res) + break; + + already_written += write_bytes; + buf += write_bytes; + *ppos = pos += write_bytes; + count -= write_bytes; + balance_dirty_pages_ratelimited(inode->i_mapping); } - /* well, we have allocated the blocks, so it is time to free - the reservation we made earlier. */ - reiserfs_release_claimed_blocks(inode->i_sb, blocks_to_allocate); - if ( res ) { - reiserfs_unprepare_pages(prepared_pages, num_pages); - break; + /* this is only true on error */ + if (th.t_trans_id) { + reiserfs_write_lock(inode->i_sb); + err = journal_end(&th, th.t_super, th.t_blocks_allocated); + reiserfs_write_unlock(inode->i_sb); + if (err) { + res = err; + goto out; + } } -/* NOTE that allocating blocks and filling blocks can be done in reverse order - and probably we would do that just to get rid of garbage in files after a - crash */ + if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) + res = + generic_osync_inode(inode, file->f_mapping, + OSYNC_METADATA | OSYNC_DATA); - /* Copy data from user-supplied buffer to file's pages */ - res = reiserfs_copy_from_user_to_file_region(pos, num_pages, write_bytes, prepared_pages, buf); - if ( res ) { - reiserfs_unprepare_pages(prepared_pages, num_pages); - break; - } + up(&inode->i_sem); + reiserfs_async_progress_wait(inode->i_sb); + return (already_written != 0) ? already_written : res; - /* Send the pages to disk and unlock them. */ - res = reiserfs_submit_file_region_for_write(&th, inode, pos, num_pages, - write_bytes,prepared_pages); - if ( res ) - break; - - already_written += write_bytes; - buf += write_bytes; - *ppos = pos += write_bytes; - count -= write_bytes; - balance_dirty_pages_ratelimited(inode->i_mapping); - } - - /* this is only true on error */ - if (th.t_trans_id) { - reiserfs_write_lock(inode->i_sb); - err = journal_end(&th, th.t_super, th.t_blocks_allocated); - reiserfs_write_unlock(inode->i_sb); - if (err) { - res = err; - goto out; - } - } - - if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) - res = generic_osync_inode(inode, file->f_mapping, OSYNC_METADATA|OSYNC_DATA); - - up(&inode->i_sem); - reiserfs_async_progress_wait(inode->i_sb); - return (already_written != 0)?already_written:res; - -out: - up(&inode->i_sem); // unlock the file on exit. - return res; + out: + up(&inode->i_sem); // unlock the file on exit. + return res; } -static ssize_t reiserfs_aio_write(struct kiocb *iocb, const char __user *buf, - size_t count, loff_t pos) +static ssize_t reiserfs_aio_write(struct kiocb *iocb, const char __user * buf, + size_t count, loff_t pos) { - return generic_file_aio_write(iocb, buf, count, pos); + return generic_file_aio_write(iocb, buf, count, pos); } - - struct file_operations reiserfs_file_operations = { - .read = generic_file_read, - .write = reiserfs_file_write, - .ioctl = reiserfs_ioctl, - .mmap = generic_file_mmap, - .release = reiserfs_file_release, - .fsync = reiserfs_sync_file, - .sendfile = generic_file_sendfile, - .aio_read = generic_file_aio_read, - .aio_write = reiserfs_aio_write, + .read = generic_file_read, + .write = reiserfs_file_write, + .ioctl = reiserfs_ioctl, + .mmap = generic_file_mmap, + .release = reiserfs_file_release, + .fsync = reiserfs_sync_file, + .sendfile = generic_file_sendfile, + .aio_read = generic_file_aio_read, + .aio_write = reiserfs_aio_write, }; - -struct inode_operations reiserfs_file_inode_operations = { - .truncate = reiserfs_vfs_truncate_file, - .setattr = reiserfs_setattr, - .setxattr = reiserfs_setxattr, - .getxattr = reiserfs_getxattr, - .listxattr = reiserfs_listxattr, - .removexattr = reiserfs_removexattr, - .permission = reiserfs_permission, +struct inode_operations reiserfs_file_inode_operations = { + .truncate = reiserfs_vfs_truncate_file, + .setattr = reiserfs_setattr, + .setxattr = reiserfs_setxattr, + .getxattr = reiserfs_getxattr, + .listxattr = reiserfs_listxattr, + .removexattr = reiserfs_removexattr, + .permission = reiserfs_permission, }; - - |
