diff options
Diffstat (limited to 'fs/reiserfs/inode.c')
| -rw-r--r-- | fs/reiserfs/inode.c | 3416 |
1 files changed, 0 insertions, 3416 deletions
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c deleted file mode 100644 index d39ee5f6c075..000000000000 --- a/fs/reiserfs/inode.c +++ /dev/null @@ -1,3416 +0,0 @@ -/* - * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README - */ - -#include <linux/time.h> -#include <linux/fs.h> -#include "reiserfs.h" -#include "acl.h" -#include "xattr.h" -#include <linux/exportfs.h> -#include <linux/pagemap.h> -#include <linux/highmem.h> -#include <linux/slab.h> -#include <linux/uaccess.h> -#include <linux/unaligned.h> -#include <linux/buffer_head.h> -#include <linux/mpage.h> -#include <linux/writeback.h> -#include <linux/quotaops.h> -#include <linux/swap.h> -#include <linux/uio.h> -#include <linux/bio.h> - -int reiserfs_commit_write(struct file *f, struct page *page, - unsigned from, unsigned to); - -void reiserfs_evict_inode(struct inode *inode) -{ - /* - * We need blocks for transaction + (user+group) quota - * update (possibly delete) - */ - int jbegin_count = - JOURNAL_PER_BALANCE_CNT * 2 + - 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb); - struct reiserfs_transaction_handle th; - int err; - - if (!inode->i_nlink && !is_bad_inode(inode)) - dquot_initialize(inode); - - truncate_inode_pages_final(&inode->i_data); - if (inode->i_nlink) - goto no_delete; - - /* - * The = 0 happens when we abort creating a new inode - * for some reason like lack of space.. - * also handles bad_inode case - */ - if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { - - reiserfs_delete_xattrs(inode); - - reiserfs_write_lock(inode->i_sb); - - if (journal_begin(&th, inode->i_sb, jbegin_count)) - goto out; - reiserfs_update_inode_transaction(inode); - - reiserfs_discard_prealloc(&th, inode); - - err = reiserfs_delete_object(&th, inode); - - /* - * Do quota update inside a transaction for journaled quotas. - * We must do that after delete_object so that quota updates - * go into the same transaction as stat data deletion - */ - if (!err) { - int depth = reiserfs_write_unlock_nested(inode->i_sb); - dquot_free_inode(inode); - reiserfs_write_lock_nested(inode->i_sb, depth); - } - - if (journal_end(&th)) - goto out; - - /* - * check return value from reiserfs_delete_object after - * ending the transaction - */ - if (err) - goto out; - - /* - * all items of file are deleted, so we can remove - * "save" link - * we can't do anything about an error here - */ - remove_save_link(inode, 0 /* not truncate */); -out: - reiserfs_write_unlock(inode->i_sb); - } else { - /* no object items are in the tree */ - ; - } - - /* note this must go after the journal_end to prevent deadlock */ - clear_inode(inode); - - dquot_drop(inode); - inode->i_blocks = 0; - return; - -no_delete: - clear_inode(inode); - dquot_drop(inode); -} - -static void _make_cpu_key(struct cpu_key *key, int version, __u32 dirid, - __u32 objectid, loff_t offset, int type, int length) -{ - key->version = version; - - key->on_disk_key.k_dir_id = dirid; - key->on_disk_key.k_objectid = objectid; - set_cpu_key_k_offset(key, offset); - set_cpu_key_k_type(key, type); - key->key_length = length; -} - -/* - * take base of inode_key (it comes from inode always) (dirid, objectid) - * and version from an inode, set offset and type of key - */ -void make_cpu_key(struct cpu_key *key, struct inode *inode, loff_t offset, - int type, int length) -{ - _make_cpu_key(key, get_inode_item_key_version(inode), - le32_to_cpu(INODE_PKEY(inode)->k_dir_id), - le32_to_cpu(INODE_PKEY(inode)->k_objectid), offset, type, - length); -} - -/* when key is 0, do not set version and short key */ -inline void make_le_item_head(struct item_head *ih, const struct cpu_key *key, - int version, - loff_t offset, int type, int length, - int entry_count /*or ih_free_space */ ) -{ - if (key) { - ih->ih_key.k_dir_id = cpu_to_le32(key->on_disk_key.k_dir_id); - ih->ih_key.k_objectid = - cpu_to_le32(key->on_disk_key.k_objectid); - } - put_ih_version(ih, version); - set_le_ih_k_offset(ih, offset); - set_le_ih_k_type(ih, type); - put_ih_item_len(ih, length); - /* set_ih_free_space (ih, 0); */ - /* - * for directory items it is entry count, for directs and stat - * datas - 0xffff, for indirects - 0 - */ - put_ih_entry_count(ih, entry_count); -} - -/* - * FIXME: we might cache recently accessed indirect item - * Ugh. Not too eager for that.... - * I cut the code until such time as I see a convincing argument (benchmark). - * I don't want a bloated inode struct..., and I don't like code complexity.... - */ - -/* - * cutting the code is fine, since it really isn't in use yet and is easy - * to add back in. But, Vladimir has a really good idea here. Think - * about what happens for reading a file. For each page, - * The VFS layer calls reiserfs_read_folio, who searches the tree to find - * an indirect item. This indirect item has X number of pointers, where - * X is a big number if we've done the block allocation right. But, - * we only use one or two of these pointers during each call to read_folio, - * needlessly researching again later on. - * - * The size of the cache could be dynamic based on the size of the file. - * - * I'd also like to see us cache the location the stat data item, since - * we are needlessly researching for that frequently. - * - * --chris - */ - -/* - * If this page has a file tail in it, and - * it was read in by get_block_create_0, the page data is valid, - * but tail is still sitting in a direct item, and we can't write to - * it. So, look through this page, and check all the mapped buffers - * to make sure they have valid block numbers. Any that don't need - * to be unmapped, so that __block_write_begin will correctly call - * reiserfs_get_block to convert the tail into an unformatted node - */ -static inline void fix_tail_page_for_writing(struct page *page) -{ - struct buffer_head *head, *next, *bh; - - if (page && page_has_buffers(page)) { - head = page_buffers(page); - bh = head; - do { - next = bh->b_this_page; - if (buffer_mapped(bh) && bh->b_blocknr == 0) { - reiserfs_unmap_buffer(bh); - } - bh = next; - } while (bh != head); - } -} - -/* - * reiserfs_get_block does not need to allocate a block only if it has been - * done already or non-hole position has been found in the indirect item - */ -static inline int allocation_needed(int retval, b_blocknr_t allocated, - struct item_head *ih, - __le32 * item, int pos_in_item) -{ - if (allocated) - return 0; - if (retval == POSITION_FOUND && is_indirect_le_ih(ih) && - get_block_num(item, pos_in_item)) - return 0; - return 1; -} - -static inline int indirect_item_found(int retval, struct item_head *ih) -{ - return (retval == POSITION_FOUND) && is_indirect_le_ih(ih); -} - -static inline void set_block_dev_mapped(struct buffer_head *bh, - b_blocknr_t block, struct inode *inode) -{ - map_bh(bh, inode->i_sb, block); -} - -/* - * files which were created in the earlier version can not be longer, - * than 2 gb - */ -static int file_capable(struct inode *inode, sector_t block) -{ - /* it is new file. */ - if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 || - /* old file, but 'block' is inside of 2gb */ - block < (1 << (31 - inode->i_sb->s_blocksize_bits))) - return 1; - - return 0; -} - -static int restart_transaction(struct reiserfs_transaction_handle *th, - struct inode *inode, struct treepath *path) -{ - struct super_block *s = th->t_super; - int err; - - BUG_ON(!th->t_trans_id); - BUG_ON(!th->t_refcount); - - pathrelse(path); - - /* we cannot restart while nested */ - if (th->t_refcount > 1) { - return 0; - } - reiserfs_update_sd(th, inode); - err = journal_end(th); - if (!err) { - err = journal_begin(th, s, JOURNAL_PER_BALANCE_CNT * 6); - if (!err) - reiserfs_update_inode_transaction(inode); - } - return err; -} - -/* - * it is called by get_block when create == 0. Returns block number - * for 'block'-th logical block of file. When it hits direct item it - * returns 0 (being called from bmap) or read direct item into piece - * of page (bh_result) - * Please improve the english/clarity in the comment above, as it is - * hard to understand. - */ -static int _get_block_create_0(struct inode *inode, sector_t block, - struct buffer_head *bh_result, int args) -{ - INITIALIZE_PATH(path); - struct cpu_key key; - struct buffer_head *bh; - struct item_head *ih, tmp_ih; - b_blocknr_t blocknr; - char *p; - int chars; - int ret; - int result; - int done = 0; - unsigned long offset; - - /* prepare the key to look for the 'block'-th block of file */ - make_cpu_key(&key, inode, - (loff_t) block * inode->i_sb->s_blocksize + 1, TYPE_ANY, - 3); - - result = search_for_position_by_key(inode->i_sb, &key, &path); - if (result != POSITION_FOUND) { - pathrelse(&path); - if (result == IO_ERROR) - return -EIO; - /* - * We do not return -ENOENT if there is a hole but page is - * uptodate, because it means that there is some MMAPED data - * associated with it that is yet to be written to disk. - */ - if ((args & GET_BLOCK_NO_HOLE) - && !PageUptodate(bh_result->b_page)) { - return -ENOENT; - } - return 0; - } - - bh = get_last_bh(&path); - ih = tp_item_head(&path); - if (is_indirect_le_ih(ih)) { - __le32 *ind_item = (__le32 *) ih_item_body(bh, ih); - - /* - * FIXME: here we could cache indirect item or part of it in - * the inode to avoid search_by_key in case of subsequent - * access to file - */ - blocknr = get_block_num(ind_item, path.pos_in_item); - ret = 0; - if (blocknr) { - map_bh(bh_result, inode->i_sb, blocknr); - if (path.pos_in_item == - ((ih_item_len(ih) / UNFM_P_SIZE) - 1)) { - set_buffer_boundary(bh_result); - } - } else - /* - * We do not return -ENOENT if there is a hole but - * page is uptodate, because it means that there is - * some MMAPED data associated with it that is - * yet to be written to disk. - */ - if ((args & GET_BLOCK_NO_HOLE) - && !PageUptodate(bh_result->b_page)) { - ret = -ENOENT; - } - - pathrelse(&path); - return ret; - } - /* requested data are in direct item(s) */ - if (!(args & GET_BLOCK_READ_DIRECT)) { - /* - * we are called by bmap. FIXME: we can not map block of file - * when it is stored in direct item(s) - */ - pathrelse(&path); - return -ENOENT; - } - - /* - * if we've got a direct item, and the buffer or page was uptodate, - * we don't want to pull data off disk again. skip to the - * end, where we map the buffer and return - */ - if (buffer_uptodate(bh_result)) { - goto finished; - } else - /* - * grab_tail_page can trigger calls to reiserfs_get_block on - * up to date pages without any buffers. If the page is up - * to date, we don't want read old data off disk. Set the up - * to date bit on the buffer instead and jump to the end - */ - if (!bh_result->b_page || PageUptodate(bh_result->b_page)) { - set_buffer_uptodate(bh_result); - goto finished; - } - /* read file tail into part of page */ - offset = (cpu_key_k_offset(&key) - 1) & (PAGE_SIZE - 1); - copy_item_head(&tmp_ih, ih); - - /* - * we only want to kmap if we are reading the tail into the page. - * this is not the common case, so we don't kmap until we are - * sure we need to. But, this means the item might move if - * kmap schedules - */ - p = (char *)kmap(bh_result->b_page); - p += offset; - memset(p, 0, inode->i_sb->s_blocksize); - do { - if (!is_direct_le_ih(ih)) { - BUG(); - } - /* - * make sure we don't read more bytes than actually exist in - * the file. This can happen in odd cases where i_size isn't - * correct, and when direct item padding results in a few - * extra bytes at the end of the direct item - */ - if ((le_ih_k_offset(ih) + path.pos_in_item) > inode->i_size) - break; - if ((le_ih_k_offset(ih) - 1 + ih_item_len(ih)) > inode->i_size) { - chars = - inode->i_size - (le_ih_k_offset(ih) - 1) - - path.pos_in_item; - done = 1; - } else { - chars = ih_item_len(ih) - path.pos_in_item; - } - memcpy(p, ih_item_body(bh, ih) + path.pos_in_item, chars); - - if (done) - break; - - p += chars; - - /* - * we done, if read direct item is not the last item of - * node FIXME: we could try to check right delimiting key - * to see whether direct item continues in the right - * neighbor or rely on i_size - */ - if (PATH_LAST_POSITION(&path) != (B_NR_ITEMS(bh) - 1)) - break; - - /* update key to look for the next piece */ - set_cpu_key_k_offset(&key, cpu_key_k_offset(&key) + chars); - result = search_for_position_by_key(inode->i_sb, &key, &path); - if (result != POSITION_FOUND) - /* i/o error most likely */ - break; - bh = get_last_bh(&path); - ih = tp_item_head(&path); - } while (1); - - flush_dcache_page(bh_result->b_page); - kunmap(bh_result->b_page); - -finished: - pathrelse(&path); - - if (result == IO_ERROR) - return -EIO; - - /* - * this buffer has valid data, but isn't valid for io. mapping it to - * block #0 tells the rest of reiserfs it just has a tail in it - */ - map_bh(bh_result, inode->i_sb, 0); - set_buffer_uptodate(bh_result); - return 0; -} - -/* - * this is called to create file map. So, _get_block_create_0 will not - * read direct item - */ -static int reiserfs_bmap(struct inode *inode, sector_t block, - struct buffer_head *bh_result, int create) -{ - if (!file_capable(inode, block)) - return -EFBIG; - - reiserfs_write_lock(inode->i_sb); - /* do not read the direct item */ - _get_block_create_0(inode, block, bh_result, 0); - reiserfs_write_unlock(inode->i_sb); - return 0; -} - -/* - * special version of get_block that is only used by grab_tail_page right - * now. It is sent to __block_write_begin, and when you try to get a - * block past the end of the file (or a block from a hole) it returns - * -ENOENT instead of a valid buffer. __block_write_begin expects to - * be able to do i/o on the buffers returned, unless an error value - * is also returned. - * - * So, this allows __block_write_begin to be used for reading a single block - * in a page. Where it does not produce a valid page for holes, or past the - * end of the file. This turns out to be exactly what we need for reading - * tails for conversion. - * - * The point of the wrapper is forcing a certain value for create, even - * though the VFS layer is calling this function with create==1. If you - * don't want to send create == GET_BLOCK_NO_HOLE to reiserfs_get_block, - * don't use this function. -*/ -static int reiserfs_get_block_create_0(struct inode *inode, sector_t block, - struct buffer_head *bh_result, - int create) -{ - return reiserfs_get_block(inode, block, bh_result, GET_BLOCK_NO_HOLE); -} - -/* - * This is special helper for reiserfs_get_block in case we are executing - * direct_IO request. - */ -static int reiserfs_get_blocks_direct_io(struct inode *inode, - sector_t iblock, - struct buffer_head *bh_result, - int create) -{ - int ret; - - bh_result->b_page = NULL; - - /* - * We set the b_size before reiserfs_get_block call since it is - * referenced in convert_tail_for_hole() that may be called from - * reiserfs_get_block() - */ - bh_result->b_size = i_blocksize(inode); - - ret = reiserfs_get_block(inode, iblock, bh_result, - create | GET_BLOCK_NO_DANGLE); - if (ret) - goto out; - - /* don't allow direct io onto tail pages */ - if (buffer_mapped(bh_result) && bh_result->b_blocknr == 0) { - /* - * make sure future calls to the direct io funcs for this - * offset in the file fail by unmapping the buffer - */ - clear_buffer_mapped(bh_result); - ret = -EINVAL; - } - - /* - * Possible unpacked tail. Flush the data before pages have - * disappeared - */ - if (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) { - int err; - - reiserfs_write_lock(inode->i_sb); - - err = reiserfs_commit_for_inode(inode); - REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask; - - reiserfs_write_unlock(inode->i_sb); - - if (err < 0) - ret = err; - } -out: - return ret; -} - -/* - * helper function for when reiserfs_get_block is called for a hole - * but the file tail is still in a direct item - * bh_result is the buffer head for the hole - * tail_offset is the offset of the start of the tail in the file - * - * This calls prepare_write, which will start a new transaction - * you should not be in a transaction, or have any paths held when you - * call this. - */ -static int convert_tail_for_hole(struct inode *inode, - struct buffer_head *bh_result, - loff_t tail_offset) -{ - unsigned long index; - unsigned long tail_end; - unsigned long tail_start; - struct page *tail_page; - struct page *hole_page = bh_result->b_page; - int retval = 0; - - if ((tail_offset & (bh_result->b_size - 1)) != 1) - return -EIO; - - /* always try to read until the end of the block */ - tail_start = tail_offset & (PAGE_SIZE - 1); - tail_end = (tail_start | (bh_result->b_size - 1)) + 1; - - index = tail_offset >> PAGE_SHIFT; - /* - * hole_page can be zero in case of direct_io, we are sure - * that we cannot get here if we write with O_DIRECT into tail page - */ - if (!hole_page || index != hole_page->index) { - tail_page = grab_cache_page(inode->i_mapping, index); - retval = -ENOMEM; - if (!tail_page) { - goto out; - } - } else { - tail_page = hole_page; - } - - /* - * we don't have to make sure the conversion did not happen while - * we were locking the page because anyone that could convert - * must first take i_mutex. - * - * We must fix the tail page for writing because it might have buffers - * that are mapped, but have a block number of 0. This indicates tail - * data that has been read directly into the page, and - * __block_write_begin won't trigger a get_block in this case. - */ - fix_tail_page_for_writing(tail_page); - retval = __reiserfs_write_begin(tail_page, tail_start, - tail_end - tail_start); - if (retval) - goto unlock; - - /* tail conversion might change the data in the page */ - flush_dcache_page(tail_page); - - retval = reiserfs_commit_write(NULL, tail_page, tail_start, tail_end); - -unlock: - if (tail_page != hole_page) { - unlock_page(tail_page); - put_page(tail_page); - } -out: - return retval; -} - -static inline int _allocate_block(struct reiserfs_transaction_handle *th, - sector_t block, - struct inode *inode, - b_blocknr_t * allocated_block_nr, - struct treepath *path, int flags) -{ - BUG_ON(!th->t_trans_id); - -#ifdef REISERFS_PREALLOCATE - if (!(flags & GET_BLOCK_NO_IMUX)) { - return reiserfs_new_unf_blocknrs2(th, inode, allocated_block_nr, - path, block); - } -#endif - return reiserfs_new_unf_blocknrs(th, inode, allocated_block_nr, path, - block); -} - -int reiserfs_get_block(struct inode *inode, sector_t block, - struct buffer_head *bh_result, int create) -{ - int repeat, retval = 0; - /* b_blocknr_t is (unsigned) 32 bit int*/ - b_blocknr_t allocated_block_nr = 0; - INITIALIZE_PATH(path); - int pos_in_item; - struct cpu_key key; - struct buffer_head *bh, *unbh = NULL; - struct item_head *ih, tmp_ih; - __le32 *item; - int done; - int fs_gen; - struct reiserfs_transaction_handle *th = NULL; - /* - * space reserved in transaction batch: - * . 3 balancings in direct->indirect conversion - * . 1 block involved into reiserfs_update_sd() - * XXX in practically impossible worst case direct2indirect() - * can incur (much) more than 3 balancings. - * quota update for user, group - */ - int jbegin_count = - JOURNAL_PER_BALANCE_CNT * 3 + 1 + - 2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); - int version; - int dangle = 1; - loff_t new_offset = - (((loff_t) block) << inode->i_sb->s_blocksize_bits) + 1; - - reiserfs_write_lock(inode->i_sb); - version = get_inode_item_key_version(inode); - - if (!file_capable(inode, block)) { - reiserfs_write_unlock(inode->i_sb); - return -EFBIG; - } - - /* - * if !create, we aren't changing the FS, so we don't need to - * log anything, so we don't need to start a transaction - */ - if (!(create & GET_BLOCK_CREATE)) { - int ret; - /* find number of block-th logical block of the file */ - ret = _get_block_create_0(inode, block, bh_result, - create | GET_BLOCK_READ_DIRECT); - reiserfs_write_unlock(inode->i_sb); - return ret; - } - - /* - * if we're already in a transaction, make sure to close - * any new transactions we start in this func - */ - if ((create & GET_BLOCK_NO_DANGLE) || - reiserfs_transaction_running(inode->i_sb)) - dangle = 0; - - /* - * If file is of such a size, that it might have a tail and - * tails are enabled we should mark it as possibly needing - * tail packing on close - */ - 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; - - /* set the key of the first byte in the 'block'-th block of file */ - make_cpu_key(&key, inode, new_offset, TYPE_ANY, 3 /*key length */ ); - if ((new_offset + inode->i_sb->s_blocksize - 1) > inode->i_size) { -start_trans: - th = reiserfs_persistent_transaction(inode->i_sb, jbegin_count); - if (!th) { - retval = -ENOMEM; - goto failure; - } - reiserfs_update_inode_transaction(inode); - } -research: - - retval = search_for_position_by_key(inode->i_sb, &key, &path); - if (retval == IO_ERROR) { - retval = -EIO; - goto failure; - } - - bh = get_last_bh(&path); - ih = tp_item_head(&path); - item = tp_item_body(&path); - pos_in_item = path.pos_in_item; - - fs_gen = get_generation(inode->i_sb); - copy_item_head(&tmp_ih, ih); - - if (allocation_needed - (retval, allocated_block_nr, ih, item, pos_in_item)) { - /* we have to allocate block for the unformatted node */ - if (!th) { - pathrelse(&path); - goto start_trans; - } - - repeat = - _allocate_block(th, block, inode, &allocated_block_nr, - &path, create); - - /* - * restart the transaction to give the journal a chance to free - * some blocks. releases the path, so we have to go back to - * research if we succeed on the second try - */ - if (repeat == NO_DISK_SPACE || repeat == QUOTA_EXCEEDED) { - SB_JOURNAL(inode->i_sb)->j_next_async_flush = 1; - retval = restart_transaction(th, inode, &path); - if (retval) - goto failure; - repeat = - _allocate_block(th, block, inode, - &allocated_block_nr, NULL, create); - - if (repeat != NO_DISK_SPACE && repeat != QUOTA_EXCEEDED) { - goto research; - } - if (repeat == QUOTA_EXCEEDED) - retval = -EDQUOT; - else - retval = -ENOSPC; - goto failure; - } - - if (fs_changed(fs_gen, inode->i_sb) - && item_moved(&tmp_ih, &path)) { - goto research; - } - } - - if (indirect_item_found(retval, ih)) { - b_blocknr_t unfm_ptr; - /* - * 'block'-th block is in the file already (there is - * corresponding cell in some indirect item). But it may be - * zero unformatted node pointer (hole) - */ - unfm_ptr = get_block_num(item, pos_in_item); - if (unfm_ptr == 0) { - /* use allocated block to plug the hole */ - reiserfs_prepare_for_journal(inode->i_sb, bh, 1); - if (fs_changed(fs_gen, inode->i_sb) - && item_moved(&tmp_ih, &path)) { - reiserfs_restore_prepared_buffer(inode->i_sb, - bh); - goto research; - } - set_buffer_new(bh_result); - if (buffer_dirty(bh_result) - && reiserfs_data_ordered(inode->i_sb)) - reiserfs_add_ordered_list(inode, bh_result); - put_block_num(item, pos_in_item, allocated_block_nr); - unfm_ptr = allocated_block_nr; - journal_mark_dirty(th, bh); - reiserfs_update_sd(th, inode); - } - set_block_dev_mapped(bh_result, unfm_ptr, inode); - pathrelse(&path); - retval = 0; - if (!dangle && th) - retval = reiserfs_end_persistent_transaction(th); - - reiserfs_write_unlock(inode->i_sb); - - /* - * the item was found, so new blocks were not added to the file - * there is no need to make sure the inode is updated with this - * transaction - */ - return retval; - } - - if (!th) { - pathrelse(&path); - goto start_trans; - } - - /* - * desired position is not found or is in the direct item. We have - * to append file with holes up to 'block'-th block converting - * direct items to indirect one if necessary - */ - done = 0; - do { - if (is_statdata_le_ih(ih)) { - __le32 unp = 0; - struct cpu_key tmp_key; - - /* indirect item has to be inserted */ - make_le_item_head(&tmp_ih, &key, version, 1, - TYPE_INDIRECT, UNFM_P_SIZE, - 0 /* free_space */ ); - - /* - * we are going to add 'block'-th block to the file. - * Use allocated block for that - */ - if (cpu_key_k_offset(&key) == 1) { - unp = cpu_to_le32(allocated_block_nr); - set_block_dev_mapped(bh_result, - allocated_block_nr, inode); - set_buffer_new(bh_result); - done = 1; - } - tmp_key = key; /* ;) */ - set_cpu_key_k_offset(&tmp_key, 1); - PATH_LAST_POSITION(&path)++; - - retval = - reiserfs_insert_item(th, &path, &tmp_key, &tmp_ih, - inode, (char *)&unp); - if (retval) { - reiserfs_free_block(th, inode, - allocated_block_nr, 1); - /* - * retval == -ENOSPC, -EDQUOT or -EIO - * or -EEXIST - */ - goto failure; - } - } else if (is_direct_le_ih(ih)) { - /* direct item has to be converted */ - loff_t tail_offset; - - tail_offset = - ((le_ih_k_offset(ih) - - 1) & ~(inode->i_sb->s_blocksize - 1)) + 1; - - /* - * direct item we just found fits into block we have - * to map. Convert it into unformatted node: use - * bh_result for the conversion - */ - if (tail_offset == cpu_key_k_offset(&key)) { - set_block_dev_mapped(bh_result, - allocated_block_nr, inode); - unbh = bh_result; - done = 1; - } else { - /* - * we have to pad file tail stored in direct - * item(s) up to block size and convert it - * to unformatted node. FIXME: this should - * also get into page cache - */ - - pathrelse(&path); - /* - * ugly, but we can only end the transaction if - * we aren't nested - */ - BUG_ON(!th->t_refcount); - if (th->t_refcount == 1) { - retval = - reiserfs_end_persistent_transaction - (th); - th = NULL; - if (retval) - goto failure; - } - - retval = - convert_tail_for_hole(inode, bh_result, - tail_offset); - if (retval) { - if (retval != -ENOSPC) - reiserfs_error(inode->i_sb, - "clm-6004", - "convert tail failed " - "inode %lu, error %d", - inode->i_ino, - retval); - if (allocated_block_nr) { - /* - * the bitmap, the super, - * and the stat data == 3 - */ - if (!th) - th = reiserfs_persistent_transaction(inode->i_sb, 3); - if (th) - reiserfs_free_block(th, - inode, - allocated_block_nr, - 1); - } - goto failure; - } - goto research; - } - retval = - direct2indirect(th, inode, &path, unbh, - tail_offset); - if (retval) { - reiserfs_unmap_buffer(unbh); - reiserfs_free_block(th, inode, - allocated_block_nr, 1); - goto failure; - } - /* - * it is important the set_buffer_uptodate is done - * after the direct2indirect. The buffer might - * contain valid data newer than the data on disk - * (read by read_folio, changed, and then sent here by - * writepage). direct2indirect needs to know if unbh - * was already up to date, so it can decide if the - * data in unbh needs to be replaced with data from - * the disk - */ - set_buffer_uptodate(unbh); - - /* - * unbh->b_page == NULL in case of DIRECT_IO request, - * this means buffer will disappear shortly, so it - * should not be added to - */ - if (unbh->b_page) { - /* - * we've converted the tail, so we must - * flush unbh before the transaction commits - */ - reiserfs_add_tail_list(inode, unbh); - - /* - * mark it dirty now to prevent commit_write - * from adding this buffer to the inode's - * dirty buffer list - */ - /* - * AKPM: changed __mark_buffer_dirty to - * mark_buffer_dirty(). It's still atomic, - * but it sets the page dirty too, which makes - * it eligible for writeback at any time by the - * VM (which was also the case with - * __mark_buffer_dirty()) - */ - mark_buffer_dirty(unbh); - } - } else { - /* - * append indirect item with holes if needed, when - * appending pointer to 'block'-th block use block, - * which is already allocated - */ - struct cpu_key tmp_key; - /* - * We use this in case we need to allocate - * only one block which is a fastpath - */ - unp_t unf_single = 0; - unp_t *un; - __u64 max_to_insert = - MAX_ITEM_LEN(inode->i_sb->s_blocksize) / - UNFM_P_SIZE; - __u64 blocks_needed; - - RFALSE(pos_in_item != ih_item_len(ih) / UNFM_P_SIZE, - "vs-804: invalid position for append"); - /* - * indirect item has to be appended, - * set up key of that position - * (key type is unimportant) - */ - make_cpu_key(&tmp_key, inode, - le_key_k_offset(version, - &ih->ih_key) + - op_bytes_number(ih, - inode->i_sb->s_blocksize), - TYPE_INDIRECT, 3); - - RFALSE(cpu_key_k_offset(&tmp_key) > cpu_key_k_offset(&key), - "green-805: invalid offset"); - blocks_needed = - 1 + - ((cpu_key_k_offset(&key) - - cpu_key_k_offset(&tmp_key)) >> inode->i_sb-> - s_blocksize_bits); - - if (blocks_needed == 1) { - un = &unf_single; - } else { - un = kcalloc(min(blocks_needed, max_to_insert), - UNFM_P_SIZE, GFP_NOFS); - if (!un) { - un = &unf_single; - blocks_needed = 1; - max_to_insert = 0; - } - } - if (blocks_needed <= max_to_insert) { - /* - * we are going to add target block to - * the file. Use allocated block for that - */ - un[blocks_needed - 1] = - cpu_to_le32(allocated_block_nr); - set_block_dev_mapped(bh_result, - allocated_block_nr, inode); - set_buffer_new(bh_result); - done = 1; - } else { - /* paste hole to the indirect item */ - /* - * If kcalloc failed, max_to_insert becomes - * zero and it means we only have space for - * one block - */ - blocks_needed = - max_to_insert ? max_to_insert : 1; - } - retval = - reiserfs_paste_into_item(th, &path, &tmp_key, inode, - (char *)un, - UNFM_P_SIZE * - blocks_needed); - - if (blocks_needed != 1) - kfree(un); - - if (retval) { - reiserfs_free_block(th, inode, - allocated_block_nr, 1); - goto failure; - } - if (!done) { - /* - * We need to mark new file size in case - * this function will be interrupted/aborted - * later on. And we may do this only for - * holes. - */ - inode->i_size += - inode->i_sb->s_blocksize * blocks_needed; - } - } - - if (done == 1) - break; - - /* - * this loop could log more blocks than we had originally - * asked for. So, we have to allow the transaction to end - * if it is too big or too full. Update the inode so things - * are consistent if we crash before the function returns - * release the path so that anybody waiting on the path before - * ending their transaction will be able to continue. - */ - if (journal_transaction_should_end(th, th->t_blocks_allocated)) { - retval = restart_transaction(th, inode, &path); - if (retval) - goto failure; - } - /* - * inserting indirect pointers for a hole can take a - * long time. reschedule if needed and also release the write - * lock for others. - */ - reiserfs_cond_resched(inode->i_sb); - - retval = search_for_position_by_key(inode->i_sb, &key, &path); - if (retval == IO_ERROR) { - retval = -EIO; - goto failure; - } - if (retval == POSITION_FOUND) { - reiserfs_warning(inode->i_sb, "vs-825", - "%K should not be found", &key); - retval = -EEXIST; - if (allocated_block_nr) - reiserfs_free_block(th, inode, - allocated_block_nr, 1); - pathrelse(&path); - goto failure; - } - bh = get_last_bh(&path); - ih = tp_item_head(&path); - item = tp_item_body(&path); - pos_in_item = path.pos_in_item; - } while (1); - - retval = 0; - -failure: - if (th && (!dangle || (retval && !th->t_trans_id))) { - int err; - if (th->t_trans_id) - reiserfs_update_sd(th, inode); - err = r |