X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Freiserfs%2Ffile.c;h=33408417038c2c93c576534c8d946deaa66ef4e9;hb=9e0dc6606a4f26a70cede6bf181cbff21f4c5477;hp=26950113af8cc6a299d2f7086b1df1ba9ee62b14;hpb=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2;p=safe%2Fjmp%2Flinux-2.6 diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c index 2695011..3340841 100644 --- a/fs/reiserfs/file.c +++ b/fs/reiserfs/file.c @@ -2,12 +2,10 @@ * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README */ - #include #include #include #include -#include #include #include #include @@ -31,82 +29,102 @@ ** 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 (); + BUG_ON(!S_ISREG(inode->i_mode)); - /* 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; + } + + mutex_lock(&inode->i_mutex); + mutex_lock(&(REISERFS_I(inode)->i_mmap)); + if (REISERFS_I(inode)->i_flags & i_ever_mapped) + REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask; + + reiserfs_write_lock(inode->i_sb); + /* 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", + inode->i_ino); + 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); + 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: + mutex_unlock(&(REISERFS_I(inode)->i_mmap)); + mutex_unlock(&inode->i_mutex); + reiserfs_write_unlock(inode->i_sb); + return err; +} - /* copy back the error code from journal_begin */ - if (!err) - err = jbegin_failure; +static int reiserfs_file_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct inode *inode; + + inode = file->f_path.dentry->d_inode; + mutex_lock(&(REISERFS_I(inode)->i_mmap)); + REISERFS_I(inode)->i_flags |= i_ever_mapped; + mutex_unlock(&(REISERFS_I(inode)->i_mmap)); - 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; + return generic_file_mmap(file, vma); } -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. */ @@ -116,1010 +134,92 @@ 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; -} - -/* I really do not want to play with memory shortage right now, so - to simplify the code, we are not going to write more than this much pages at - a time. This still should considerably improve performance compared to 4k - at a time case. This is 32 pages of 4k size. */ -#define REISERFS_WRITE_PAGES_AT_A_TIME (128 * 1024) / PAGE_CACHE_SIZE - -/* 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_sync_file(struct file *p_s_filp, + struct dentry *p_s_dentry, int datasync) { - 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 - __u32 * 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); // 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; - 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 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) - - { - 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; - } - 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); - } - } - - // 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. - } - /* 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++; - } - 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); - } - 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"); - - 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); - 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 - - 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); - } -} - -/* 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*/ - ) -{ - 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; + struct inode *p_s_inode = p_s_dentry->d_inode; + int n_err; + int barrier_done; + + BUG_ON(!S_ISREG(p_s_inode->i_mode)); + 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 && reiserfs_barrier_flush(p_s_inode->i_sb)) + blkdev_issue_flush(p_s_inode->i_sb->s_bdev, NULL); + if (barrier_done < 0) + return barrier_done; + return (n_err < 0) ? -EIO : 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); } - } - 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 */ - ) -{ - 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); - 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; -} - -/* 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 */ - ) -{ - 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); - - reiserfs_write_unlock(inode->i_sb); - return res; -} - -/* This function locks pages starting from @pos for @inode. - @num_pages pages are locked and stored in - @prepared_pages array. Also buffers are allocated for these pages. - First and last page of the region is read if it is overwritten only - partially. If last page did not exist before write (file hole or file - 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 */ - ) -{ - 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. - __u32 * 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); - } - - /* 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; - } - - 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 - } - - 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 - } - 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); - - /* 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); - } - } - } - } - - /* 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); + 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); + } + } } - } } - - /* 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; + if (logit) { + ret = journal_end(&th, s, bh_per_page + 1); + drop_write_lock: + reiserfs_write_unlock(s); } - } - - return blocks; -failed_page_grabbing: - num_pages = i; -failed_read: - reiserfs_unprepare_pages(prepared_pages, num_pages); - return res; + /* + * 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; } /* Write @count bytes at position @ppos in a file indicated by @file @@ -1148,261 +248,63 @@ 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. - - // 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 */ - res = -ENOSPC; /* single page, return -ENOSPC */ - if ( pos > (inode->i_size & (inode->i_sb->s_blocksize-1))) - break; // In case we are writing past the file end, 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)); - } - - /* 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; - } - - /* 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); - } - - /* 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; - } - -/* 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 */ - - /* 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; + struct inode *inode = file->f_path.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 reiserfs_transaction_handle th; + th.t_trans_id = 0; + + /* If a filesystem is converted from 3.5 to 3.6, we'll have v3.5 items + * lying around (most of the disk, in fact). Despite the filesystem + * now being a v3.6 format, the old items still can't support large + * file sizes. Catch this case here, as the rest of the VFS layer is + * oblivious to the different limitations between old and new items. + * reiserfs_setattr catches this for truncates. This chunk is lifted + * from generic_write_checks. */ + if (get_inode_item_key_version (inode) == KEY_FORMAT_3_5 && + *ppos + count > MAX_NON_LFS) { + if (*ppos >= MAX_NON_LFS) { + return -EFBIG; + } + if (count > MAX_NON_LFS - (unsigned long)*ppos) + count = MAX_NON_LFS - (unsigned long)*ppos; } - /* 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; -} - -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 do_sync_write(file, buf, count, ppos); } - - -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, +const struct file_operations reiserfs_file_operations = { + .read = do_sync_read, + .write = reiserfs_file_write, + .ioctl = reiserfs_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = reiserfs_compat_ioctl, +#endif + .mmap = reiserfs_file_mmap, + .open = generic_file_open, + .release = reiserfs_file_release, + .fsync = reiserfs_sync_file, + .aio_read = generic_file_aio_read, + .aio_write = generic_file_aio_write, + .splice_read = generic_file_splice_read, + .splice_write = generic_file_splice_write, + .llseek = generic_file_llseek, }; - -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, +const 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, }; - -