| /* |
| * 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 <asm/uaccess.h> |
| #include <asm/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/aio.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(&inode->i_data, 0); |
| if (inode->i_nlink) |
| goto no_delete; |
| |
| /* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */ |
| if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */ |
| |
| 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, inode->i_sb, jbegin_count)) |
| 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 */ |
| remove_save_link(inode, 0 /* not truncate */ ); /* we can't do anything |
| * about an error here */ |
| out: |
| reiserfs_write_unlock(inode->i_sb); |
| } else { |
| /* no object items are in the tree */ |
| ; |
| } |
| clear_inode(inode); /* note this must go after the journal_end to prevent deadlock */ |
| 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_readpage, 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 readpage, |
| ** 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) |
| { |
| if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 || // it is new file. |
| block < (1 << (31 - inode->i_sb->s_blocksize_bits))) // old file, but 'block' is inside of 2gb |
| 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 len = th->t_blocks_allocated; |
| 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, s, len); |
| 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 = NULL; |
| 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 (p) |
| kunmap(bh_result->b_page); |
| 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 = get_ih(&path); |
| if (is_indirect_le_ih(ih)) { |
| __le32 *ind_item = (__le32 *) B_I_PITEM(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); |
| if (p) |
| kunmap(bh_result->b_page); |
| 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); |
| if (p) |
| kunmap(bh_result->b_page); |
| 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_CACHE_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 |
| */ |
| if (!p) |
| 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, B_I_PITEM(bh, ih) + path.pos_in_item, chars); |
| |
| if (done) |
| break; |
| |
| p += chars; |
| |
| if (PATH_LAST_POSITION(&path) != (B_NR_ITEMS(bh) - 1)) |
| // 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 |
| 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 = get_ih(&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 = (1 << inode->i_blkbits); |
| |
| 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_CACHE_SIZE - 1); |
| tail_end = (tail_start | (bh_result->b_size - 1)) + 1; |
| |
| index = tail_offset >> PAGE_CACHE_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); |
| page_cache_release(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 allocated_block_nr = 0; // b_blocknr_t is (unsigned) 32 bit int |
| 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 = get_ih(&path); |
| item = get_item(&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); |
| |
| if (repeat == NO_DISK_SPACE || repeat == QUOTA_EXCEEDED) { |
| /* 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 |
| */ |
| 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, inode->i_sb, 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 */ ); |
| |
| if (cpu_key_k_offset(&key) == 1) { |
| /* we are going to add 'block'-th block to the file. Use |
| allocated block for that */ |
| 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); |
| goto failure; // retval == -ENOSPC, -EDQUOT or -EIO or -EEXIST |
| } |
| //mark_tail_converted (inode); |
| } 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; |
| if (tail_offset == cpu_key_k_offset(&key)) { |
| /* direct item we just found fits into block we have |
| to map. Convert it into unformatted node: use |
| bh_result for the conversion */ |
| set_block_dev_mapped(bh_result, |
| allocated_block_nr, inode); |
| unbh = bh_result; |
| done = 1; |
| } else { |
| /* we have to padd 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 readpage, 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; |
| unp_t unf_single = 0; // We use this in case we need to allocate only |
| // one block which is a fastpath |
| 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 */ |
| make_cpu_key(&tmp_key, inode, |
| le_key_k_offset(version, |
| &(ih->ih_key)) + |
| op_bytes_number(ih, |
| inode->i_sb->s_blocksize), |
| //pos_in_item * inode->i_sb->s_blocksize, |
| TYPE_INDIRECT, 3); // key type is unimportant |
| |
| 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 = kzalloc(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 kmalloc 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 = get_ih(&path); |
| item = get_item(&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 = reiserfs_end_persistent_transaction(th); |
| if (err) |
| retval = err; |
| } |
| |
| reiserfs_write_unlock(inode->i_sb); |
| reiserfs_check_path(&path); |
| return retval; |
| } |
| |
| static int |
| reiserfs_readpages(struct file *file, struct address_space *mapping, |
| struct list_head *pages, unsigned nr_pages) |
| { |
| return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block); |
| } |
| |
| /* Compute real number of used bytes by file |
| * Following three functions can go away when we'll have enough space in stat item |
| */ |
| static int real_space_diff(struct inode *inode, int sd_size) |
| { |
| int bytes; |
| loff_t blocksize = inode->i_sb->s_blocksize; |
| |
| if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) |
| return sd_size; |
| |
| /* End of file is also in full block with indirect reference, so round |
| ** up to the next block. |
| ** |
| ** there is just no way to know if the tail is actually packed |
| ** on the file, so we have to assume it isn't. When we pack the |
| ** tail, we add 4 bytes to pretend there really is an unformatted |
| ** node pointer |
| */ |
| bytes = |
| ((inode->i_size + |
| (blocksize - 1)) >> inode->i_sb->s_blocksize_bits) * UNFM_P_SIZE + |
| sd_size; |
| return bytes; |
| } |
| |
| static inline loff_t to_real_used_space(struct inode *inode, ulong blocks, |
| int sd_size) |
| { |
| if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) { |
| return inode->i_size + |
| (loff_t) (real_space_diff(inode, sd_size)); |
| } |
| return ((loff_t) real_space_diff(inode, sd_size)) + |
| (((loff_t) blocks) << 9); |
| } |
| |
| /* Compute number of blocks used by file in ReiserFS counting */ |
| static inline ulong to_fake_used_blocks(struct inode *inode, int sd_size) |
| { |
| loff_t bytes = inode_get_bytes(inode); |
| loff_t real_space = real_space_diff(inode, sd_size); |
| |
| /* keeps fsck and non-quota versions of reiserfs happy */ |
| if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) { |
| bytes += (loff_t) 511; |
| } |
| |
| /* files from before the quota patch might i_blocks such that |
| ** bytes < real_space. Deal with that here to prevent it from |
| ** going negative. |
| */ |
| if (bytes < real_space) |
| return 0; |
| return (bytes - real_space) >> 9; |
| } |
| |
| // |
| // BAD: new directories have stat data of new type and all other items |
| // of old type. Version stored in the inode says about body items, so |
| // in update_stat_data we can not rely on inode, but have to check |
| // item version directly |
| // |
| |
| // called by read_locked_inode |
| static void init_inode(struct inode *inode, struct treepath *path) |
| { |
| struct buffer_head *bh; |
| struct item_head *ih; |
| __u32 rdev; |
| //int version = ITEM_VERSION_1; |
| |
| bh = PATH_PLAST_BUFFER(path); |
| ih = PATH_PITEM_HEAD(path); |
| |
| copy_key(INODE_PKEY(inode), &(ih->ih_key)); |
| |
| INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list)); |
| REISERFS_I(inode)->i_flags = 0; |
| REISERFS_I(inode)->i_prealloc_block = 0; |
| REISERFS_I(inode)->i_prealloc_count = 0; |
| REISERFS_I(inode)->i_trans_id = 0; |
| REISERFS_I(inode)->i_jl = NULL; |
| reiserfs_init_xattr_rwsem(inode); |
| |
| if (stat_data_v1(ih)) { |
| struct stat_data_v1 *sd = |
| (struct stat_data_v1 *)B_I_PITEM(bh, ih); |
| unsigned long blocks; |
| |
| set_inode_item_key_version(inode, KEY_FORMAT_3_5); |
| set_inode_sd_version(inode, STAT_DATA_V1); |
| inode->i_mode = sd_v1_mode(sd); |
| set_nlink(inode, sd_v1_nlink(sd)); |
| i_uid_write(inode, sd_v1_uid(sd)); |
| i_gid_write(inode, sd_v1_gid(sd)); |
| inode->i_size = sd_v1_size(sd); |
| inode->i_atime.tv_sec = sd_v1_atime(sd); |
| inode->i_mtime.tv_sec = sd_v1_mtime(sd); |
| inode->i_ctime.tv_sec = sd_v1_ctime(sd); |
| inode->i_atime.tv_nsec = 0; |
| inode->i_ctime.tv_nsec = 0; |
| inode->i_mtime.tv_nsec = 0; |
| |
| inode->i_blocks = sd_v1_blocks(sd); |
| inode->i_generation = le32_to_cpu(INODE_PKEY(inode)->k_dir_id); |
| blocks = (inode->i_size + 511) >> 9; |
| blocks = _ROUND_UP(blocks, inode->i_sb->s_blocksize >> 9); |
| if (inode->i_blocks > blocks) { |
| // there was a bug in <=3.5.23 when i_blocks could take negative |
| // values. Starting from 3.5.17 this value could even be stored in |
| // stat data. For such files we set i_blocks based on file |
| // size. Just 2 notes: this can be wrong for sparce files. On-disk value will be |
| // only updated if file's inode will ever change |
| inode->i_blocks = blocks; |
| } |
| |
| rdev = sd_v1_rdev(sd); |
| REISERFS_I(inode)->i_first_direct_byte = |
| sd_v1_first_direct_byte(sd); |
| /* an early bug in the quota code can give us an odd number for the |
| ** block count. This is incorrect, fix it here. |
| */ |
| if (inode->i_blocks & 1) { |
| inode->i_blocks++; |
| } |
| inode_set_bytes(inode, |
| to_real_used_space(inode, inode->i_blocks, |
| SD_V1_SIZE)); |
| /* nopack is initially zero for v1 objects. For v2 objects, |
| nopack is initialised from sd_attrs */ |
| REISERFS_I(inode)->i_flags &= ~i_nopack_mask; |
| } else { |
| // new stat data found, but object may have old items |
| // (directories and symlinks) |
| struct stat_data *sd = (struct stat_data *)B_I_PITEM(bh, ih); |
| |
| inode->i_mode = sd_v2_mode(sd); |
| set_nlink(inode, sd_v2_nlink(sd)); |
| i_uid_write(inode, sd_v2_uid(sd)); |
| inode->i_size = sd_v2_size(sd); |
| i_gid_write(inode, sd_v2_gid(sd)); |
| inode->i_mtime.tv_sec = sd_v2_mtime(sd); |
| inode->i_atime.tv_sec = sd_v2_atime(sd); |
| inode->i_ctime.tv_sec = sd_v2_ctime(sd); |
| inode->i_ctime.tv_nsec = 0; |
| inode->i_mtime.tv_nsec = 0; |
| inode->i_atime.tv_nsec = 0; |
| inode->i_blocks = sd_v2_blocks(sd); |
| rdev = sd_v2_rdev(sd); |
| if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) |
| inode->i_generation = |
| le32_to_cpu(INODE_PKEY(inode)->k_dir_id); |
| else |
| inode->i_generation = sd_v2_generation(sd); |
| |
| if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) |
| set_inode_item_key_version(inode, KEY_FORMAT_3_5); |
| else |
| set_inode_item_key_version(inode, KEY_FORMAT_3_6); |
| REISERFS_I(inode)->i_first_direct_byte = 0; |
| set_inode_sd_version(inode, STAT_DATA_V2); |
| inode_set_bytes(inode, |
| to_real_used_space(inode, inode->i_blocks, |
| SD_V2_SIZE)); |
| /* read persistent inode attributes from sd and initialise |
| generic inode flags from them */ |
| REISERFS_I(inode)->i_attrs = sd_v2_attrs(sd); |
| sd_attrs_to_i_attrs(sd_v2_attrs(sd), inode); |
| } |
| |
| pathrelse(path); |
| if (S_ISREG(inode->i_mode)) { |
| inode->i_op = &reiserfs_file_inode_operations; |
| inode->i_fop = &reiserfs_file_operations; |
| inode->i_mapping->a_ops = &reiserfs_address_space_operations; |
| } else if (S_ISDIR(inode->i_mode)) { |
| inode->i_op = &reiserfs_dir_inode_operations; |
| inode->i_fop = &reiserfs_dir_operations; |
| } else if (S_ISLNK(inode->i_mode)) { |
| inode->i_op = &reiserfs_symlink_inode_operations; |
| inode->i_mapping->a_ops = &reiserfs_address_space_operations; |
| } else { |
| inode->i_blocks = 0; |
| inode->i_op = &reiserfs_special_inode_operations; |
| init_special_inode(inode, inode->i_mode, new_decode_dev(rdev)); |
| } |
| } |
| |
| // update new stat data with inode fields |
| static void inode2sd(void *sd, struct inode *inode, loff_t size) |
| { |
| struct stat_data *sd_v2 = (struct stat_data *)sd; |
| __u16 flags; |
| |
| set_sd_v2_mode(sd_v2, inode->i_mode); |
| set_sd_v2_nlink(sd_v2, inode->i_nlink); |
| set_sd_v2_uid(sd_v2, i_uid_read(inode)); |
| set_sd_v2_size(sd_v2, size); |
| set_sd_v2_gid(sd_v2, i_gid_read(inode)); |
| set_sd_v2_mtime(sd_v2, inode->i_mtime.tv_sec); |
| set_sd_v2_atime(sd_v2, inode->i_atime.tv_sec); |
| set_sd_v2_ctime(sd_v2, inode->i_ctime.tv_sec); |
| set_sd_v2_blocks(sd_v2, to_fake_used_blocks(inode, SD_V2_SIZE)); |
| if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) |
| set_sd_v2_rdev(sd_v2, new_encode_dev(inode->i_rdev)); |
| else |
| set_sd_v2_generation(sd_v2, inode->i_generation); |
| flags = REISERFS_I(inode)->i_attrs; |
| i_attrs_to_sd_attrs(inode, &flags); |
| set_sd_v2_attrs(sd_v2, flags); |
| } |
| |
| // used to copy inode's fields to old stat data |
| static void inode2sd_v1(void *sd, struct inode *inode, loff_t size) |
| { |
| struct stat_data_v1 *sd_v1 = (struct stat_data_v1 *)sd; |
| |
| set_sd_v1_mode(sd_v1, inode->i_mode); |
| set_sd_v1_uid(sd_v1, i_uid_read(inode)); |
| set_sd_v1_gid(sd_v1, i_gid_read(inode)); |
| set_sd_v1_nlink(sd_v1, inode->i_nlink); |
| set_sd_v1_size(sd_v1, size); |
| set_sd_v1_atime(sd_v1, inode->i_atime.tv_sec); |
| set_sd_v1_ctime(sd_v1, inode->i_ctime.tv_sec); |
| set_sd_v1_mtime(sd_v1, inode->i_mtime.tv_sec); |
| |
| if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) |
| set_sd_v1_rdev(sd_v1, new_encode_dev(inode->i_rdev)); |
| else |
| set_sd_v1_blocks(sd_v1, to_fake_used_blocks(inode, SD_V1_SIZE)); |
| |
| // Sigh. i_first_direct_byte is back |
| set_sd_v1_first_direct_byte(sd_v1, |
| REISERFS_I(inode)->i_first_direct_byte); |
| } |
| |
| /* NOTE, you must prepare the buffer head before sending it here, |
| ** and then log it after the call |
| */ |
| static void update_stat_data(struct treepath *path, struct inode *inode, |
| loff_t size) |
| { |
| struct buffer_head *bh; |
| struct item_head *ih; |
| |
| bh = PATH_PLAST_BUFFER(path); |
| ih = PATH_PITEM_HEAD(path); |
| |
| if (!is_statdata_le_ih(ih)) |
| reiserfs_panic(inode->i_sb, "vs-13065", "key %k, found item %h", |
| INODE_PKEY(inode), ih); |
| |
| if (stat_data_v1(ih)) { |
| // path points to old stat data |
| inode2sd_v1(B_I_PITEM(bh, ih), inode, size); |
| } else { |
| inode2sd(B_I_PITEM(bh, ih), inode, size); |
| } |
| |
| return; |
| } |
| |
| void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th, |
| struct inode *inode, loff_t size) |
| { |
| struct cpu_key key; |
| INITIALIZE_PATH(path); |
| struct buffer_head *bh; |
| int fs_gen; |
| struct item_head *ih, tmp_ih; |
| int retval; |
| |
| BUG_ON(!th->t_trans_id); |
| |
| make_cpu_key(&key, inode, SD_OFFSET, TYPE_STAT_DATA, 3); //key type is unimportant |
| |
| for (;;) { |
| int pos; |
| /* look for the object's stat data */ |
| retval = search_item(inode->i_sb, &key, &path); |
| if (retval == IO_ERROR) { |
| reiserfs_error(inode->i_sb, "vs-13050", |
| "i/o failure occurred trying to " |
| "update %K stat data", &key); |
| return; |
| } |
| if (retval == ITEM_NOT_FOUND) { |
| pos = PATH_LAST_POSITION(&path); |
| pathrelse(&path); |
| if (inode->i_nlink == 0) { |
| /*reiserfs_warning (inode->i_sb, "vs-13050: reiserfs_update_sd: i_nlink == 0, stat data not found"); */ |
| return; |
| } |
| reiserfs_warning(inode->i_sb, "vs-13060", |
| "stat data of object %k (nlink == %d) " |
| "not found (pos %d)", |
| INODE_PKEY(inode), inode->i_nlink, |
| pos); |
| reiserfs_check_path(&path); |
| return; |
| } |
| |
| /* sigh, prepare_for_journal might schedule. When it schedules the |
| ** FS might change. We have to detect that, and loop back to the |
| ** search if the stat data item has moved |
| */ |
| bh = get_last_bh(&path); |
| ih = get_ih(&path); |
| copy_item_head(&tmp_ih, ih); |
| fs_gen = get_generation(inode->i_sb); |
| 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); |
| continue; /* Stat_data item has been moved after scheduling. */ |
| } |
| break; |
| } |
| update_stat_data(&path, inode, size); |
| journal_mark_dirty(th, th->t_super, bh); |
| pathrelse(&path); |
| return; |
| } |
| |
| /* reiserfs_read_locked_inode is called to read the inode off disk, and it |
| ** does a make_bad_inode when things go wrong. But, we need to make sure |
| ** and clear the key in the private portion of the inode, otherwise a |
| ** corresponding iput might try to delete whatever object the inode last |
| ** represented. |
| */ |
| static void reiserfs_make_bad_inode(struct inode *inode) |
| { |
| memset(INODE_PKEY(inode), 0, KEY_SIZE); |
| make_bad_inode(inode); |
| } |
| |
| // |
| // initially this function was derived from minix or ext2's analog and |
| // evolved as the prototype did |
| // |
| |
| int reiserfs_init_locked_inode(struct inode *inode, void *p) |
| { |
| struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p; |
| inode->i_ino = args->objectid; |
| INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid); |
| return 0; |
| } |
| |
| /* looks for stat data in the tree, and fills up the fields of in-core |
| inode stat data fields */ |
| void reiserfs_read_locked_inode(struct inode *inode, |
| struct reiserfs_iget_args *args) |
| { |
| INITIALIZE_PATH(path_to_sd); |
| struct cpu_key key; |
| unsigned long dirino; |
| int retval; |
| |
| dirino = args->dirid; |
| |
| /* set version 1, version 2 could be used too, because stat data |
| key is the same in both versions */ |
| key.version = KEY_FORMAT_3_5; |
| key.on_disk_key.k_dir_id = dirino; |
| key.on_disk_key.k_objectid = inode->i_ino; |
| key.on_disk_key.k_offset = 0; |
| key.on_disk_key.k_type = 0; |
| |
| /* look for the object's stat data */ |
| retval = search_item(inode->i_sb, &key, &path_to_sd); |
| if (retval == IO_ERROR) { |
| reiserfs_error(inode->i_sb, "vs-13070", |
| "i/o failure occurred trying to find " |
| "stat data of %K", &key); |
| reiserfs_make_bad_inode(inode); |
| return; |
| } |
| if (retval != ITEM_FOUND) { |
| /* a stale NFS handle can trigger this without it being an error */ |
| pathrelse(&path_to_sd); |
| reiserfs_make_bad_inode(inode); |
| clear_nlink(inode); |
| return; |
| } |
| |
| init_inode(inode, &path_to_sd); |
| |
| /* It is possible that knfsd is trying to access inode of a file |
| that is being removed from the disk by some other thread. As we |
| update sd on unlink all that is required is to check for nlink |
| here. This bug was first found by Sizif when debugging |
| SquidNG/Butterfly, forgotten, and found again after Philippe |
| Gramoulle <philippe.gramoulle@mmania.com> reproduced it. |
| |
| More logical fix would require changes in fs/inode.c:iput() to |
| remove inode from hash-table _after_ fs cleaned disk stuff up and |
| in iget() to return NULL if I_FREEING inode is found in |
| hash-table. */ |
| /* Currently there is one place where it's ok to meet inode with |
| nlink==0: processing of open-unlinked and half-truncated files |
| during mount (fs/reiserfs/super.c:finish_unfinished()). */ |
| if ((inode->i_nlink == 0) && |
| !REISERFS_SB(inode->i_sb)->s_is_unlinked_ok) { |
| reiserfs_warning(inode->i_sb, "vs-13075", |
| "dead inode read from disk %K. " |
| "This is likely to be race with knfsd. Ignore", |
| &key); |
| reiserfs_make_bad_inode(inode); |
| } |
| |
| reiserfs_check_path(&path_to_sd); /* init inode should be relsing */ |
| |
| /* |
| * Stat data v1 doesn't support ACLs. |
| */ |
| if (get_inode_sd_version(inode) == STAT_DATA_V1) |
| cache_no_acl(inode); |
| } |
| |
| /** |
| * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked(). |
| * |
| * @inode: inode from hash table to check |
| * @opaque: "cookie" passed to iget5_locked(). This is &reiserfs_iget_args. |
| * |
| * This function is called by iget5_locked() to distinguish reiserfs inodes |
| * having the same inode numbers. Such inodes can only exist due to some |
| * error condition. One of them should be bad. Inodes with identical |
| * inode numbers (objectids) are distinguished by parent directory ids. |
| * |
| */ |
| int reiserfs_find_actor(struct inode *inode, void *opaque) |
| { |
| struct reiserfs_iget_args *args; |
| |
| args = opaque; |
| /* args is already in CPU order */ |
| return (inode->i_ino == args->objectid) && |
| (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid); |
| } |
| |
| struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key) |
| { |
| struct inode *inode; |
| struct reiserfs_iget_args args; |
| int depth; |
| |
| args.objectid = key->on_disk_key.k_objectid; |
| args.dirid = key->on_disk_key.k_dir_id; |
| depth = reiserfs_write_unlock_nested(s); |
| inode = iget5_locked(s, key->on_disk_key.k_objectid, |
| reiserfs_find_actor, reiserfs_init_locked_inode, |
| (void *)(&args)); |
| reiserfs_write_lock_nested(s, depth); |
| if (!inode) |
| return ERR_PTR(-ENOMEM); |
| |
| if (inode->i_state & I_NEW) { |
| reiserfs_read_locked_inode(inode, &args); |
| unlock_new_inode(inode); |
| } |
| |
| if (comp_short_keys(INODE_PKEY(inode), key) || is_bad_inode(inode)) { |
| /* either due to i/o error or a stale NFS handle */ |
| iput(inode); |
| inode = NULL; |
| } |
| return inode; |
| } |
| |
| static struct dentry *reiserfs_get_dentry(struct super_block *sb, |
| u32 objectid, u32 dir_id, u32 generation) |
| |
| { |
| struct cpu_key key; |
| struct inode *inode; |
| |
| key.on_disk_key.k_objectid = objectid; |
| key.on_disk_key.k_dir_id = dir_id; |
| reiserfs_write_lock(sb); |
| inode = reiserfs_iget(sb, &key); |
| if (inode && !IS_ERR(inode) && generation != 0 && |
| generation != inode->i_generation) { |
| iput(inode); |
| inode = NULL; |
| } |
| reiserfs_write_unlock(sb); |
| |
| return d_obtain_alias(inode); |
| } |
| |
| struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid, |
| int fh_len, int fh_type) |
| { |
| /* fhtype happens to reflect the number of u32s encoded. |
| * due to a bug in earlier code, fhtype might indicate there |
| * are more u32s then actually fitted. |
| * so if fhtype seems to be more than len, reduce fhtype. |
| * Valid types are: |
| * 2 - objectid + dir_id - legacy support |
| * 3 - objectid + dir_id + generation |
| * 4 - objectid + dir_id + objectid and dirid of parent - legacy |
| * 5 - objectid + dir_id + generation + objectid and dirid of parent |
| * 6 - as above plus generation of directory |
| * 6 does not fit in NFSv2 handles |
| */ |
| if (fh_type > fh_len) { |
| if (fh_type != 6 || fh_len != 5) |
| reiserfs_warning(sb, "reiserfs-13077", |
| "nfsd/reiserfs, fhtype=%d, len=%d - odd", |
| fh_type, fh_len); |
| fh_type = fh_len; |
| } |
| if (fh_len < 2) |
| return NULL; |
| |
| return reiserfs_get_dentry(sb, fid->raw[0], fid->raw[1], |
| (fh_type == 3 || fh_type >= 5) ? fid->raw[2] : 0); |
| } |
| |
| struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid, |
| int fh_len, int fh_type) |
| { |
| if (fh_type > fh_len) |
| fh_type = fh_len; |
| if (fh_type < 4) |
| return NULL; |
| |
| return reiserfs_get_dentry(sb, |
| (fh_type >= 5) ? fid->raw[3] : fid->raw[2], |
| (fh_type >= 5) ? fid->raw[4] : fid->raw[3], |
| (fh_type == 6) ? fid->raw[5] : 0); |
| } |
| |
| int reiserfs_encode_fh(struct inode *inode, __u32 * data, int *lenp, |
| struct inode *parent) |
| { |
| int maxlen = *lenp; |
| |
| if (parent && (maxlen < 5)) { |
| *lenp = 5; |
| return FILEID_INVALID; |
| } else if (maxlen < 3) { |
| *lenp = 3; |
| return FILEID_INVALID; |
| } |
| |
| data[0] = inode->i_ino; |
| data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id); |
| data[2] = inode->i_generation; |
| *lenp = 3; |
| if (parent) { |
| data[3] = parent->i_ino; |
| data[4] = le32_to_cpu(INODE_PKEY(parent)->k_dir_id); |
| *lenp = 5; |
| if (maxlen >= 6) { |
| data[5] = parent->i_generation; |
| *lenp = 6; |
| } |
| } |
| return *lenp; |
| } |
| |
| /* looks for stat data, then copies fields to it, marks the buffer |
| containing stat data as dirty */ |
| /* reiserfs inodes are never really dirty, since the dirty inode call |
| ** always logs them. This call allows the VFS inode marking routines |
| ** to properly mark inodes for datasync and such, but only actually |
| ** does something when called for a synchronous update. |
| */ |
| int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
| { |
| struct reiserfs_transaction_handle th; |
| int jbegin_count = 1; |
| |
| if (inode->i_sb->s_flags & MS_RDONLY) |
| return -EROFS; |
| /* memory pressure can sometimes initiate write_inode calls with sync == 1, |
| ** these cases are just when the system needs ram, not when the |
| ** inode needs to reach disk for safety, and they can safely be |
| ** ignored because the altered inode has already been logged. |
| */ |
| if (wbc->sync_mode == WB_SYNC_ALL && !(current->flags & PF_MEMALLOC)) { |
| reiserfs_write_lock(inode->i_sb); |
| if (!journal_begin(&th, inode->i_sb, jbegin_count)) { |
| reiserfs_update_sd(&th, inode); |
| journal_end_sync(&th, inode->i_sb, jbegin_count); |
| } |
| reiserfs_write_unlock(inode->i_sb); |
| } |
| return 0; |
| } |
| |
| /* stat data of new object is inserted already, this inserts the item |
| containing "." and ".." entries */ |
| static int reiserfs_new_directory(struct reiserfs_transaction_handle *th, |
| struct inode *inode, |
| struct item_head *ih, struct treepath *path, |
| struct inode *dir) |
| { |
| struct super_block *sb = th->t_super; |
| char empty_dir[EMPTY_DIR_SIZE]; |
| char *body = empty_dir; |
| struct cpu_key key; |
| int retval; |
| |
| BUG_ON(!th->t_trans_id); |
| |
| _make_cpu_key(&key, KEY_FORMAT_3_5, le32_to_cpu(ih->ih_key.k_dir_id), |
| le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET, |
| TYPE_DIRENTRY, 3 /*key length */ ); |
| |
| /* compose item head for new item. Directories consist of items of |
| old type (ITEM_VERSION_1). Do not set key (second arg is 0), it |
| is done by reiserfs_new_inode */ |
| if (old_format_only(sb)) { |
| make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET, |
| TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2); |
| |
| make_empty_dir_item_v1(body, ih->ih_key.k_dir_id, |
| ih->ih_key.k_objectid, |
| INODE_PKEY(dir)->k_dir_id, |
| INODE_PKEY(dir)->k_objectid); |
| } else { |
| make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET, |
| TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2); |
| |
| make_empty_dir_item(body, ih->ih_key.k_dir_id, |
| ih->ih_key.k_objectid, |
| INODE_PKEY(dir)->k_dir_id, |
| INODE_PKEY(dir)->k_objectid); |
| } |
| |
| /* look for place in the tree for new item */ |
| retval = search_item(sb, &key, path); |
| if (retval == IO_ERROR) { |
| reiserfs_error(sb, "vs-13080", |
| "i/o failure occurred creating new directory"); |
| return -EIO; |
| } |
| if (retval == ITEM_FOUND) { |
| pathrelse(path); |
| reiserfs_warning(sb, "vs-13070", |
| "object with this key exists (%k)", |
| &(ih->ih_key)); |
| return -EEXIST; |
| } |
| |
| /* insert item, that is empty directory item */ |
| return reiserfs_insert_item(th, path, &key, ih, inode, body); |
| } |
| |
| /* stat data of object has been inserted, this inserts the item |
| containing the body of symlink */ |
| static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th, struct inode *inode, /* Inode of symlink */ |
| struct item_head *ih, |
| struct treepath *path, const char *symname, |
| int item_len) |
| { |
| struct super_block *sb = th->t_super; |
| struct cpu_key key; |
| int retval; |
| |
| BUG_ON(!th->t_trans_id); |
| |
| _make_cpu_key(&key, KEY_FORMAT_3_5, |
| le32_to_cpu(ih->ih_key.k_dir_id), |
| le32_to_cpu(ih->ih_key.k_objectid), |
| 1, TYPE_DIRECT, 3 /*key length */ ); |
| |
| make_le_item_head(ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len, |
| 0 /*free_space */ ); |
| |
| /* look for place in the tree for new item */ |
| retval = search_item(sb, &key, path); |
| if (retval == IO_ERROR) { |
| reiserfs_error(sb, "vs-13080", |
| "i/o failure occurred creating new symlink"); |
| return -EIO; |
| } |
| if (retval == ITEM_FOUND) { |
| pathrelse(path); |
| reiserfs_warning(sb, "vs-13080", |
| "object with this key exists (%k)", |
| &(ih->ih_key)); |
| return -EEXIST; |
| } |
| |
| /* insert item, that is body of symlink */ |
| return reiserfs_insert_item(th, path, &key, ih, inode, symname); |
| } |
| |
| /* inserts the stat data into the tree, and then calls |
| reiserfs_new_directory (to insert ".", ".." item if new object is |
| directory) or reiserfs_new_symlink (to insert symlink body if new |
| object is symlink) or nothing (if new object is regular file) |
| |
| NOTE! uid and gid must already be set in the inode. If we return |
| non-zero due to an error, we have to drop the quota previously allocated |
| for the fresh inode. This can only be done outside a transaction, so |
| if we return non-zero, we also end the transaction. */ |
| int reiserfs_new_inode(struct reiserfs_transaction_handle *th, |
| struct inode *dir, umode_t mode, const char *symname, |
| /* 0 for regular, EMTRY_DIR_SIZE for dirs, |
| strlen (symname) for symlinks) */ |
| loff_t i_size, struct dentry *dentry, |
| struct inode *inode, |
| struct reiserfs_security_handle *security) |
| { |
| struct super_block *sb = dir->i_sb; |
| struct reiserfs_iget_args args; |
| INITIALIZE_PATH(path_to_key); |
| struct cpu_key key; |
| struct item_head ih; |
| struct stat_data sd; |
| int retval; |
| int err; |
| int depth; |
| |
| BUG_ON(!th->t_trans_id); |
| |
| depth = reiserfs_write_unlock_nested(sb); |
| err = dquot_alloc_inode(inode); |
| reiserfs_write_lock_nested(sb, depth); |
| if (err) |
| goto out_end_trans; |
| if (!dir->i_nlink) { |
| err = -EPERM; |
| goto out_bad_inode; |
| } |
| |
| /* item head of new item */ |
| ih.ih_key.k_dir_id = reiserfs_choose_packing(dir); |
| ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th)); |
| if (!ih.ih_key.k_objectid) { |
| err = -ENOMEM; |
| goto out_bad_inode; |
| } |
| args.objectid = inode->i_ino = le32_to_cpu(ih.ih_key.k_objectid); |
| if (old_format_only(sb)) |
| make_le_item_head(&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET, |
| TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT); |
| else |
| make_le_item_head(&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET, |
| TYPE_STAT_DATA, SD_SIZE, MAX_US_INT); |
| memcpy(INODE_PKEY(inode), &(ih.ih_key), KEY_SIZE); |
| args.dirid = le32_to_cpu(ih.ih_key.k_dir_id); |
| |
| depth = reiserfs_write_unlock_nested(inode->i_sb); |
| err = insert_inode_locked4(inode, args.objectid, |
| reiserfs_find_actor, &args); |
| reiserfs_write_lock_nested(inode->i_sb, depth); |
| if (err) { |
| err = -EINVAL; |
| goto out_bad_inode; |
| } |
| |
| if (old_format_only(sb)) |
| /* not a perfect generation count, as object ids can be reused, but |
| ** this is as good as reiserfs can do right now. |
| ** note that the private part of inode isn't filled in yet, we have |
| ** to use the directory. |
| */ |
| inode->i_generation = le32_to_cpu(INODE_PKEY(dir)->k_objectid); |
| else |
| #if defined( USE_INODE_GENERATION_COUNTER ) |
| inode->i_generation = |
| le32_to_cpu(REISERFS_SB(sb)->s_rs->s_inode_generation); |
| #else |
| inode->i_generation = ++event; |
| #endif |
| |
| /* fill stat data */ |
| set_nlink(inode, (S_ISDIR(mode) ? 2 : 1)); |
| |
| /* uid and gid must already be set by the caller for quota init */ |
| |
| /* symlink cannot be immutable or append only, right? */ |
| if (S_ISLNK(inode->i_mode)) |
| inode->i_flags &= ~(S_IMMUTABLE | S_APPEND); |
| |
| inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; |
| inode->i_size = i_size; |
| inode->i_blocks = 0; |
| inode->i_bytes = 0; |
| REISERFS_I(inode)->i_first_direct_byte = S_ISLNK(mode) ? 1 : |
| U32_MAX /*NO_BYTES_IN_DIRECT_ITEM */ ; |
| |
| INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list)); |
| REISERFS_I(inode)->i_flags = 0; |
| REISERFS_I(inode)->i_prealloc_block = 0; |
| REISERFS_I(inode)->i_prealloc_count = 0; |
| REISERFS_I(inode)->i_trans_id = 0; |
| REISERFS_I(inode)->i_jl = NULL; |
| REISERFS_I(inode)->i_attrs = |
| REISERFS_I(dir)->i_attrs & REISERFS_INHERIT_MASK; |
| sd_attrs_to_i_attrs(REISERFS_I(inode)->i_attrs, inode); |
| reiserfs_init_xattr_rwsem(inode); |
| |
| /* key to search for correct place for new stat data */ |
| _make_cpu_key(&key, KEY_FORMAT_3_6, le32_to_cpu(ih.ih_key.k_dir_id), |
| le32_to_cpu(ih.ih_key.k_objectid), SD_OFFSET, |
| TYPE_STAT_DATA, 3 /*key length */ ); |
| |
| /* find proper place for inserting of stat data */ |
| retval = search_item(sb, &key, &path_to_key); |
| if (retval == IO_ERROR) { |
| err = -EIO; |
| goto out_bad_inode; |
| } |
| if (retval == ITEM_FOUND) { |
| pathrelse(&path_to_key); |
| err = -EEXIST; |
| goto out_bad_inode; |
| } |
| if (old_format_only(sb)) { |
| if (i_uid_read(inode) & ~0xffff || i_gid_read(inode) & ~0xffff) { |
| pathrelse(&path_to_key); |
| /* i_uid or i_gid is too big to be stored in stat data v3.5 */ |
| err = -EINVAL; |
| goto out_bad_inode; |
| } |
| inode2sd_v1(&sd, inode, inode->i_size); |
| } else { |
| inode2sd(&sd, inode, inode->i_size); |
| } |
| // store in in-core inode the key of stat data and version all |
| // object items will have (directory items will have old offset |
| // format, other new objects will consist of new items) |
| if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode)) |
| set_inode_item_key_version(inode, KEY_FORMAT_3_5); |
| else |
| set_inode_item_key_version(inode, KEY_FORMAT_3_6); |
| if (old_format_only(sb)) |
| set_inode_sd_version(inode, STAT_DATA_V1); |
| else |
| set_inode_sd_version(inode, STAT_DATA_V2); |
| |
| /* insert the stat data into the tree */ |
| #ifdef DISPLACE_NEW_PACKING_LOCALITIES |
| if (REISERFS_I(dir)->new_packing_locality) |
| th->displace_new_blocks = 1; |
| #endif |
| retval = |
| reiserfs_insert_item(th, &path_to_key, &key, &ih, inode, |
| (char *)(&sd)); |
| if (retval) { |
| err = retval; |
| reiserfs_check_path(&path_to_key); |
| goto out_bad_inode; |
| } |
| #ifdef DISPLACE_NEW_PACKING_LOCALITIES |
| if (!th->displace_new_blocks) |
| REISERFS_I(dir)->new_packing_locality = 0; |
| #endif |
| if (S_ISDIR(mode)) { |
| /* insert item with "." and ".." */ |
| retval = |
| reiserfs_new_directory(th, inode, &ih, &path_to_key, dir); |
| } |
| |
| if (S_ISLNK(mode)) { |
| /* insert body of symlink */ |
| if (!old_format_only(sb)) |
| i_size = ROUND_UP(i_size); |
| retval = |
| reiserfs_new_symlink(th, inode, &ih, &path_to_key, symname, |
| i_size); |
| } |
| if (retval) { |
| err = retval; |
| reiserfs_check_path(&path_to_key); |
| journal_end(th, th->t_super, th->t_blocks_allocated); |
| goto out_inserted_sd; |
| } |
| |
| if (reiserfs_posixacl(inode->i_sb)) { |
| reiserfs_write_unlock(inode->i_sb); |
| retval = reiserfs_inherit_default_acl(th, dir, dentry, inode); |
| reiserfs_write_lock(inode->i_sb); |
| if (retval) { |
| err = retval; |
| reiserfs_check_path(&path_to_key); |
| journal_end(th, th->t_super, th->t_blocks_allocated); |
| goto out_inserted_sd; |
| } |
| } else if (inode->i_sb->s_flags & MS_POSIXACL) { |
| reiserfs_warning(inode->i_sb, "jdm-13090", |
| "ACLs aren't enabled in the fs, " |
| "but vfs thinks they are!"); |
| } else if (IS_PRIVATE(dir)) |
| inode->i_flags |= S_PRIVATE; |
| |
| if (security->name) { |
| reiserfs_write_unlock(inode->i_sb); |
| retval = reiserfs_security_write(th, inode, security); |
| reiserfs_write_lock(inode->i_sb); |
| if (retval) { |
| err = retval; |
| reiserfs_check_path(&path_to_key); |
| retval = journal_end(th, th->t_super, |
| th->t_blocks_allocated); |
| if (retval) |
| err = retval; |
| goto out_inserted_sd; |
| } |
| } |
| |
| reiserfs_update_sd(th, inode); |
| reiserfs_check_path(&path_to_key); |
| |
| return 0; |
| |
| /* it looks like you can easily compress these two goto targets into |
| * one. Keeping it like this doesn't actually hurt anything, and they |
| * are place holders for what the quota code actually needs. |
| */ |
| out_bad_inode: |
| /* Invalidate the object, nothing was inserted yet */ |
| INODE_PKEY(inode)->k_objectid = 0; |
| |
| /* Quota change must be inside a transaction for journaling */ |
| depth = reiserfs_write_unlock_nested(inode->i_sb); |
| dquot_free_inode(inode); |
| reiserfs_write_lock_nested(inode->i_sb, depth); |
| |
| out_end_trans: |
| journal_end(th, th->t_super, th->t_blocks_allocated); |
| /* Drop can be outside and it needs more credits so it's better to have it outside */ |
| depth = reiserfs_write_unlock_nested(inode->i_sb); |
| dquot_drop(inode); |
| reiserfs_write_lock_nested(inode->i_sb, depth); |
| inode->i_flags |= S_NOQUOTA; |
| make_bad_inode(inode); |
| |
| out_inserted_sd: |
| clear_nlink(inode); |
| th->t_trans_id = 0; /* so the caller can't use this handle later */ |
| unlock_new_inode(inode); /* OK to do even if we hadn't locked it */ |
| iput(inode); |
| return err; |
| } |
| |
| /* |
| ** finds the tail page in the page cache, |
| ** reads the last block in. |
| ** |
| ** On success, page_result is set to a locked, pinned page, and bh_result |
| ** is set to an up to date buffer for the last block in the file. returns 0. |
| ** |
| ** tail conversion is not done, so bh_result might not be valid for writing |
| ** check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before |
| ** trying to write the block. |
| ** |
| ** on failure, nonzero is returned, page_result and bh_result are untouched. |
| */ |
| static int grab_tail_page(struct inode *inode, |
| struct page **page_result, |
| struct buffer_head **bh_result) |
| { |
| |
| /* we want the page with the last byte in the file, |
| ** not the page that will hold the next byte for appending |
| */ |
| unsigned long index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; |
| unsigned long pos = 0; |
| unsigned long start = 0; |
| unsigned long blocksize = inode->i_sb->s_blocksize; |
| unsigned long offset = (inode->i_size) & (PAGE_CACHE_SIZE - 1); |
| struct buffer_head *bh; |
| struct buffer_head *head; |
| struct page *page; |
| int error; |
| |
| /* we know that we are only called with inode->i_size > 0. |
| ** we also know that a file tail can never be as big as a block |
| ** If i_size % blocksize == 0, our file is currently block aligned |
| ** and it won't need converting or zeroing after a truncate. |
| */ |
| if ((offset & (blocksize - 1)) == 0) { |
| return -ENOENT; |
| } |
| page = grab_cache_page(inode->i_mapping, index); |
| error = -ENOMEM; |
| if (!page) { |
| goto out; |
| } |
| /* start within the page of the last block in the file */ |
| start = (offset / blocksize) * blocksize; |
| |
| error = __block_write_begin(page, start, offset - start, |
| reiserfs_get_block_create_0); |
| if (error) |
| goto unlock; |
| |
| head = page_buffers(page); |
| bh = head; |
| do { |
| if (pos >= start) { |
| break; |
| } |
| bh = bh->b_this_page; |
| pos += blocksize; |
| } while (bh != head); |
| |
| if (!buffer_uptodate(bh)) { |
| /* note, this should never happen, prepare_write should |
| ** be taking care of this for us. If the buffer isn't up to date, |
| ** I've screwed up the code to find the buffer, or the code to |
| ** call prepare_write |
| */ |
| reiserfs_error(inode->i_sb, "clm-6000", |
| "error reading block %lu", bh->b_blocknr); |
| error = -EIO; |
| goto unlock; |
| } |
| *bh_result = bh; |
| *page_result = page; |
| |
| out: |
| return error; |
| |
| unlock: |
| unlock_page(page); |
| page_cache_release(page); |
| return error; |
| } |
| |
| /* |
| ** vfs version of truncate file. Must NOT be called with |
| ** a transaction already started. |
| ** |
| ** some code taken from block_truncate_page |
| */ |
| int reiserfs_truncate_file(struct inode *inode, int update_timestamps) |
| { |
| struct reiserfs_transaction_handle th; |
| /* we want the offset for the first byte after the end of the file */ |
| unsigned long offset = inode->i_size & (PAGE_CACHE_SIZE - 1); |
| unsigned blocksize = inode->i_sb->s_blocksize; |
| unsigned length; |
| struct page *page = NULL; |
| int error; |
| struct buffer_head *bh = NULL; |
| int err2; |
| |
| reiserfs_write_lock(inode->i_sb); |
| |
| if (inode->i_size > 0) { |
| error = grab_tail_page(inode, &page, &bh); |
| if (error) { |
| // -ENOENT means we truncated past the end of the file, |
| // and get_block_create_0 could not find a block to read in, |
| // which is ok. |
| if (error != -ENOENT) |
| reiserfs_error(inode->i_sb, "clm-6001", |
| "grab_tail_page failed %d", |
| error); |
| page = NULL; |
| bh = NULL; |
| } |
| } |
| |
| /* so, if page != NULL, we have a buffer head for the offset at |
| ** the end of the file. if the bh is mapped, and bh->b_blocknr != 0, |
| ** then we have an unformatted node. Otherwise, we have a direct item, |
| ** and no zeroing is required on disk. We zero after the truncate, |
| ** because the truncate might pack the item anyway |
| ** (it will unmap bh if it packs). |
| */ |
| /* it is enough to reserve space in transaction for 2 balancings: |
| one for "save" link adding and another for the first |
| cut_from_item. 1 is for update_sd */ |
| error = journal_begin(&th, inode->i_sb, |
| JOURNAL_PER_BALANCE_CNT * 2 + 1); |
| if (error) |
| goto out; |
| reiserfs_update_inode_transaction(inode); |
| if (update_timestamps) |
| /* we are doing real truncate: if the system crashes before the last |
| transaction of truncating gets committed - on reboot the file |
| either appears truncated properly or not truncated at all */ |
| add_save_link(&th, inode, 1); |
| err2 = reiserfs_do_truncate(&th, inode, page, update_timestamps); |
| error = |
| journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 + 1); |
| if (error) |
| goto out; |
| |
| /* check reiserfs_do_truncate after ending the transaction */ |
| if (err2) { |
| error = err2; |
| goto out; |
| } |
| |
| if (update_timestamps) { |
| error = remove_save_link(inode, 1 /* truncate */); |
| if (error) |
| goto out; |
| } |
| |
| if (page) { |
| length = offset & (blocksize - 1); |
| /* if we are not on a block boundary */ |
| if (length) { |
| length = blocksize - length; |
| zero_user(page, offset, length); |
| if (buffer_mapped(bh) && bh->b_blocknr != 0) { |
| mark_buffer_dirty(bh); |
| } |
| } |
| unlock_page(page); |
| page_cache_release(page); |
| } |
| |
| reiserfs_write_unlock(inode->i_sb); |
| |
| return 0; |
| out: |
| if (page) { |
| unlock_page(page); |
| page_cache_release(page); |
| } |
| |
| reiserfs_write_unlock(inode->i_sb); |
| |
| return error; |
| } |
| |
| static int map_block_for_writepage(struct inode *inode, |
| struct buffer_head *bh_result, |
| unsigned long block) |
| { |
| struct reiserfs_transaction_handle th; |
| int fs_gen; |
| struct item_head tmp_ih; |
| struct item_head *ih; |
| struct buffer_head *bh; |
| __le32 *item; |
| struct cpu_key key; |
| INITIALIZE_PATH(path); |
| int pos_in_item; |
| int jbegin_count = JOURNAL_PER_BALANCE_CNT; |
| loff_t byte_offset = ((loff_t)block << inode->i_sb->s_blocksize_bits)+1; |
| int retval; |
| int use_get_block = 0; |
| int bytes_copied = 0; |
| int copy_size; |
| int trans_running = 0; |
| |
| /* catch places below that try to log something without starting a trans */ |
| th.t_trans_id = 0; |
| |
| if (!buffer_uptodate(bh_result)) { |
| return -EIO; |
| } |
| |
| kmap(bh_result->b_page); |
| start_over: |
| reiserfs_write_lock(inode->i_sb); |
| make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3); |
| |
| research: |
| retval = search_for_position_by_key(inode->i_sb, &key, &path); |
| if (retval != POSITION_FOUND) { |
| use_get_block = 1; |
| goto out; |
| } |
| |
| bh = get_last_bh(&path); |
| ih = get_ih(&path); |
| item = get_item(&path); |
| pos_in_item = path.pos_in_item; |
| |
| /* we've found an unformatted node */ |
| if (indirect_item_found(retval, ih)) { |
| if (bytes_copied > 0) { |
| reiserfs_warning(inode->i_sb, "clm-6002", |
| "bytes_copied %d", bytes_copied); |
| } |
| if (!get_block_num(item, pos_in_item)) { |
| /* crap, we are writing to a hole */ |
| use_get_block = 1; |
| goto out; |
| } |
| set_block_dev_mapped(bh_result, |
| get_block_num(item, pos_in_item), inode); |
| } else if (is_direct_le_ih(ih)) { |
| char *p; |
| p = page_address(bh_result->b_page); |
| p += (byte_offset - 1) & (PAGE_CACHE_SIZE - 1); |
| copy_size = ih_item_len(ih) - pos_in_item; |
| |
| fs_gen = get_generation(inode->i_sb); |
| copy_item_head(&tmp_ih, ih); |
| |
| if (!trans_running) { |
| /* vs-3050 is gone, no need to drop the path */ |
| retval = journal_begin(&th, inode->i_sb, jbegin_count); |
| if (retval) |
| goto out; |
| reiserfs_update_inode_transaction(inode); |
| trans_running = 1; |
| if (fs_changed(fs_gen, inode->i_sb) |
| && item_moved(&tmp_ih, &path)) { |
| reiserfs_restore_prepared_buffer(inode->i_sb, |
| bh); |
| goto research; |
| } |
| } |
| |
| 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; |
| } |
| |
| memcpy(B_I_PITEM(bh, ih) + pos_in_item, p + bytes_copied, |
| copy_size); |
| |
| journal_mark_dirty(&th, inode->i_sb, bh); |
| bytes_copied += copy_size; |
| set_block_dev_mapped(bh_result, 0, inode); |
| |
| /* are there still bytes left? */ |
| if (bytes_copied < bh_result->b_size && |
| (byte_offset + bytes_copied) < inode->i_size) { |
| set_cpu_key_k_offset(&key, |
| cpu_key_k_offset(&key) + |
| copy_size); |
| goto research; |
| } |
| } else { |
| reiserfs_warning(inode->i_sb, "clm-6003", |
| "bad item inode %lu", inode->i_ino); |
| retval = -EIO; |
| goto out; |
| } |
| retval = 0; |
| |
| out: |
| pathrelse(&path); |
| if (trans_running) { |
| int err = journal_end(&th, inode->i_sb, jbegin_count); |
| if (err) |
| retval = err; |
| trans_running = 0; |
| } |
| reiserfs_write_unlock(inode->i_sb); |
| |
| /* this is where we fill in holes in the file. */ |
| if (use_get_block) { |
| retval = reiserfs_get_block(inode, block, bh_result, |
| GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX |
| | GET_BLOCK_NO_DANGLE); |
| if (!retval) { |
| if (!buffer_mapped(bh_result) |
| || bh_result->b_blocknr == 0) { |
| /* get_block failed to find a mapped unformatted node. */ |
| use_get_block = 0; |
| goto start_over; |
| } |
| } |
| } |
| kunmap(bh_result->b_page); |
| |
| if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) { |
| /* we've copied data from the page into the direct item, so the |
| * buffer in the page is now clean, mark it to reflect that. |
| */ |
| lock_buffer(bh_result); |
| clear_buffer_dirty(bh_result); |
| unlock_buffer(bh_result); |
| } |
| return retval; |
| } |
| |
| /* |
| * mason@suse.com: updated in 2.5.54 to follow the same general io |
| * start/recovery path as __block_write_full_page, along with special |
| * code to handle reiserfs tails. |
| */ |
| static int reiserfs_write_full_page(struct page *page, |
| struct writeback_control *wbc) |
| { |
| struct inode *inode = page->mapping->host; |
| unsigned long end_index = inode->i_size >> PAGE_CACHE_SHIFT; |
| int error = 0; |
| unsigned long block; |
| sector_t last_block; |
| struct buffer_head *head, *bh; |
| int partial = 0; |
| int nr = 0; |
| int checked = PageChecked(page); |
| struct reiserfs_transaction_handle th; |
| struct super_block *s = inode->i_sb; |
| int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize; |
| th.t_trans_id = 0; |
| |
| /* no logging allowed when nonblocking or from PF_MEMALLOC */ |
| if (checked && (current->flags & PF_MEMALLOC)) { |
| redirty_page_for_writepage(wbc, page); |
| unlock_page(page); |
| return 0; |
| } |
| |
| /* The page dirty bit is cleared before writepage is called, which |
| * means we have to tell create_empty_buffers to make dirty buffers |
| * The page really should be up to date at this point, so tossing |
| * in the BH_Uptodate is just a sanity check. |
| */ |
| if (!page_has_buffers(page)) { |
| create_empty_buffers(page, s->s_blocksize, |
| (1 << BH_Dirty) | (1 << BH_Uptodate)); |
| } |
| head = page_buffers(page); |
| |
| /* last page in the file, zero out any contents past the |
| ** last byte in the file |
| */ |
| if (page->index >= end_index) { |
| unsigned last_offset; |
| |
| last_offset = inode->i_size & (PAGE_CACHE_SIZE - 1); |
| /* no file contents in this page */ |
| if (page->index >= end_index + 1 || !last_offset) { |
| unlock_page(page); |
| return 0; |
| } |
| zero_user_segment(page, last_offset, PAGE_CACHE_SIZE); |
| } |
| bh = head; |
| block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits); |
| last_block = (i_size_read(inode) - 1) >> inode->i_blkbits; |
| /* first map all the buffers, logging any direct items we find */ |
| do { |
| if (block > last_block) { |
| /* |
| * This can happen when the block size is less than |
| * the page size. The corresponding bytes in the page |
| * were zero filled above |
| */ |
| clear_buffer_dirty(bh); |
| set_buffer_uptodate(bh); |
| } else if ((checked || buffer_dirty(bh)) && |
| (!buffer_mapped(bh) || (buffer_mapped(bh) |
| && bh->b_blocknr == |
| 0))) { |
| /* not mapped yet, or it points to a direct item, search |
| * the btree for the mapping info, and log any direct |
| * items found |
| */ |
| if ((error = map_block_for_writepage(inode, bh, block))) { |
| goto fail; |
| } |
| } |
| bh = bh->b_this_page; |
| block++; |
| } while (bh != head); |
| |
| /* |
| * we start the transaction after map_block_for_writepage, |
| * because it can create holes in the file (an unbounded operation). |
| * starting it here, we can make a reliable estimate for how many |
| * blocks we're going to log |
| */ |
| if (checked) { |
| ClearPageChecked(page); |
| reiserfs_write_lock(s); |
| error = journal_begin(&th, s, bh_per_page + 1); |
| if (error) { |
| reiserfs_write_unlock(s); |
| goto fail; |
| } |
| reiserfs_update_inode_transaction(inode); |
| } |
| /* now go through and lock any dirty buffers on the page */ |
| do { |
| get_bh(bh); |
| if (!buffer_mapped(bh)) |
| continue; |
| if (buffer_mapped(bh) && bh->b_blocknr == 0) |
| continue; |
| |
| if (checked) { |
| reiserfs_prepare_for_journal(s, bh, 1); |
| journal_mark_dirty(&th, s, bh); |
| continue; |
| } |
| /* from this point on, we know the buffer is mapped to a |
| * real block and not a direct item |
| */ |
| if (wbc->sync_mode != WB_SYNC_NONE) { |
| lock_buffer(bh); |
| } else { |
| if (!trylock_buffer(bh)) { |
| redirty_page_for_writepage(wbc, page); |
| continue; |
| } |
| } |
| if (test_clear_buffer_dirty(bh)) { |
| mark_buffer_async_write(bh); |
| } else { |
| unlock_buffer(bh); |
| } |
| } while ((bh = bh->b_this_page) != head); |
| |
| if (checked) { |
| error = journal_end(&th, s, bh_per_page + 1); |
| reiserfs_write_unlock(s); |
| if (error) |
| goto fail; |
| } |
| BUG_ON(PageWriteback(page)); |
| set_page_writeback(page); |
| unlock_page(page); |
| |
| /* |
| * since any buffer might be the only dirty buffer on the page, |
| * the first submit_bh can bring the page out of writeback. |
| * be careful with the buffers. |
| */ |
| do { |
| struct buffer_head *next = bh->b_this_page; |
| if (buffer_async_write(bh)) { |
| submit_bh(WRITE, bh); |
| nr++; |
| } |
| put_bh(bh); |
| bh = next; |
| } while (bh != head); |
| |
| error = 0; |
| done: |
| if (nr == 0) { |
| /* |
| * if this page only had a direct item, it is very possible for |
| * no io to be required without there being an error. Or, |
| * someone else could have locked them and sent them down the |
| * pipe without locking the page |
| */ |
| bh = head; |
| do { |
| if (!buffer_uptodate(bh)) { |
| partial = 1; |
| break; |
| } |
| bh = bh->b_this_page; |
| } while (bh != head); |
| if (!partial) |
| SetPageUptodate(page); |
| end_page_writeback(page); |
| } |
| return error; |
| |
| fail: |
| /* catches various errors, we need to make sure any valid dirty blocks |
| * get to the media. The page is currently locked and not marked for |
| * writeback |
| */ |
| ClearPageUptodate(page); |
| bh = head; |
| do { |
| get_bh(bh); |
| if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) { |
| lock_buffer(bh); |
| mark_buffer_async_write(bh); |
| } else { |
| /* |
| * clear any dirty bits that might have come from getting |
| * attached to a dirty page |
| */ |
| clear_buffer_dirty(bh); |
| } |
| bh = bh->b_this_page; |
| } while (bh != head); |
| SetPageError(page); |
| BUG_ON(PageWriteback(page)); |
| set_page_writeback(page); |
| unlock_page(page); |
| do { |
| struct buffer_head *next = bh->b_this_page; |
| if (buffer_async_write(bh)) { |
| clear_buffer_dirty(bh); |
| submit_bh(WRITE, bh); |
| nr++; |
| } |
| put_bh(bh); |
| bh = next; |
| } while (bh != head); |
| goto done; |
| } |
| |
| static int reiserfs_readpage(struct file *f, struct page *page) |
| { |
| return block_read_full_page(page, reiserfs_get_block); |
| } |
| |
| static int reiserfs_writepage(struct page *page, struct writeback_control *wbc) |
| { |
| struct inode *inode = page->mapping->host; |
| reiserfs_wait_on_write_block(inode->i_sb); |
| return reiserfs_write_full_page(page, wbc); |
| } |
| |
| static void reiserfs_truncate_failed_write(struct inode *inode) |
| { |
| truncate_inode_pages(inode->i_mapping, inode->i_size); |
| reiserfs_truncate_file(inode, 0); |
| } |
| |
| static int reiserfs_write_begin(struct file *file, |
| struct address_space *mapping, |
| loff_t pos, unsigned len, unsigned flags, |
| struct page **pagep, void **fsdata) |
| { |
| struct inode *inode; |
| struct page *page; |
| pgoff_t index; |
| int ret; |
| int old_ref = 0; |
| |
| inode = mapping->host; |
| *fsdata = 0; |
| if (flags & AOP_FLAG_CONT_EXPAND && |
| (pos & (inode->i_sb->s_blocksize - 1)) == 0) { |
| pos ++; |
| *fsdata = (void *)(unsigned long)flags; |
| } |
| |
| index = pos >> PAGE_CACHE_SHIFT; |
| page = grab_cache_page_write_begin(mapping, index, flags); |
| if (!page) |
| return -ENOMEM; |
| *pagep = page; |
| |
| reiserfs_wait_on_write_block(inode->i_sb); |
| fix_tail_page_for_writing(page); |
| if (reiserfs_transaction_running(inode->i_sb)) { |
| struct reiserfs_transaction_handle *th; |
| th = (struct reiserfs_transaction_handle *)current-> |
| journal_info; |
| BUG_ON(!th->t_refcount); |
| BUG_ON(!th->t_trans_id); |
| old_ref = th->t_refcount; |
| th->t_refcount++; |
| } |
| ret = __block_write_begin(page, pos, len, reiserfs_get_block); |
| if (ret && reiserfs_transaction_running(inode->i_sb)) { |
| struct reiserfs_transaction_handle *th = current->journal_info; |
| /* this gets a little ugly. If reiserfs_get_block returned an |
| * error and left a transacstion running, we've got to close it, |
| * and we've got to free handle if it was a persistent transaction. |
| * |
| * But, if we had nested into an existing transaction, we need |
| * to just drop the ref count on the handle. |
| * |
| * If old_ref == 0, the transaction is from reiserfs_get_block, |
| * and it was a persistent trans. Otherwise, it was nested above. |
| */ |
| if (th->t_refcount > old_ref) { |
| if (old_ref) |
| th->t_refcount--; |
| else { |
| int err; |
| reiserfs_write_lock(inode->i_sb); |
| err = reiserfs_end_persistent_transaction(th); |
| reiserfs_write_unlock(inode->i_sb); |
| if (err) |
| ret = err; |
| } |
| } |
| } |
| if (ret) { |
| unlock_page(page); |
| page_cache_release(page); |
| /* Truncate allocated blocks */ |
| reiserfs_truncate_failed_write(inode); |
| } |
| return ret; |
| } |
| |
| int __reiserfs_write_begin(struct page *page, unsigned from, unsigned len) |
| { |
| struct inode *inode = page->mapping->host; |
| int ret; |
| int old_ref = 0; |
| int depth; |
| |
| depth = reiserfs_write_unlock_nested(inode->i_sb); |
| reiserfs_wait_on_write_block(inode->i_sb); |
| reiserfs_write_lock_nested(inode->i_sb, depth); |
| |
| fix_tail_page_for_writing(page); |
| if (reiserfs_transaction_running(inode->i_sb)) { |
| struct reiserfs_transaction_handle *th; |
| th = (struct reiserfs_transaction_handle *)current-> |
| journal_info; |
| BUG_ON(!th->t_refcount); |
| BUG_ON(!th->t_trans_id); |
| old_ref = th->t_refcount; |
| th->t_refcount++; |
| } |
| |
| ret = __block_write_begin(page, from, len, reiserfs_get_block); |
| if (ret && reiserfs_transaction_running(inode->i_sb)) { |
| struct reiserfs_transaction_handle *th = current->journal_info; |
| /* this gets a little ugly. If reiserfs_get_block returned an |
| * error and left a transacstion running, we've got to close it, |
| * and we've got to free handle if it was a persistent transaction. |
| * |
| * But, if we had nested into an existing transaction, we need |
| * to just drop the ref count on the handle. |
| * |
| * If old_ref == 0, the transaction is from reiserfs_get_block, |
| * and it was a persistent trans. Otherwise, it was nested above. |
| */ |
| if (th->t_refcount > old_ref) { |
| if (old_ref) |
| th->t_refcount--; |
| else { |
| int err; |
| reiserfs_write_lock(inode->i_sb); |
| err = reiserfs_end_persistent_transaction(th); |
| reiserfs_write_unlock(inode->i_sb); |
| if (err) |
| ret = err; |
| } |
| } |
| } |
| return ret; |
| |
| } |
| |
| static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block) |
| { |
| return generic_block_bmap(as, block, reiserfs_bmap); |
| } |
| |
| static int reiserfs_write_end(struct file *file, struct address_space *mapping, |
| loff_t pos, unsigned len, unsigned copied, |
| struct page *page, void *fsdata) |
| { |
| struct inode *inode = page->mapping->host; |
| int ret = 0; |
| int update_sd = 0; |
| struct reiserfs_transaction_handle *th; |
| unsigned start; |
| bool locked = false; |
| |
| if ((unsigned long)fsdata & AOP_FLAG_CONT_EXPAND) |
| pos ++; |
| |
| reiserfs_wait_on_write_block(inode->i_sb); |
| if (reiserfs_transaction_running(inode->i_sb)) |
| th = current->journal_info; |
| else |
| th = NULL; |
| |
| start = pos & (PAGE_CACHE_SIZE - 1); |
| if (unlikely(copied < len)) { |
| if (!PageUptodate(page)) |
| copied = 0; |
| |
| page_zero_new_buffers(page, start + copied, start + len); |
| } |
| flush_dcache_page(page); |
| |
| reiserfs_commit_page(inode, page, start, start + copied); |
| |
| /* generic_commit_write does this for us, but does not update the |
| ** transaction tracking stuff when the size changes. So, we have |
| ** to do the i_size updates here. |
| */ |
| if (pos + copied > inode->i_size) { |
| struct reiserfs_transaction_handle myth; |
| reiserfs_write_lock(inode->i_sb); |
| locked = true; |
| /* If the file have grown beyond the border where it |
| can have a tail, unmark it as needing a tail |
| packing */ |
| 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; |
| |
| ret = journal_begin(&myth, inode->i_sb, 1); |
| if (ret) |
| goto journal_error; |
| |
| reiserfs_update_inode_transaction(inode); |
| inode->i_size = pos + copied; |
| /* |
| * this will just nest into our transaction. It's important |
| * to use mark_inode_dirty so the inode gets pushed around on the |
| * dirty lists, and so that O_SYNC works as expected |
| */ |
| mark_inode_dirty(inode); |
| reiserfs_update_sd(&myth, inode); |
| update_sd = 1; |
| ret = journal_end(&myth, inode->i_sb, 1); |
| if (ret) |
| goto journal_error; |
| } |
| if (th) { |
| if (!locked) { |
| reiserfs_write_lock(inode->i_sb); |
| locked = true; |
| } |
| if (!update_sd) |
| mark_inode_dirty(inode); |
| ret = reiserfs_end_persistent_transaction(th); |
| if (ret) |
| goto out; |
| } |
| |
| out: |
| if (locked) |
| reiserfs_write_unlock(inode->i_sb); |
| unlock_page(page); |
| page_cache_release(page); |
| |
| if (pos + len > inode->i_size) |
| reiserfs_truncate_failed_write(inode); |
| |
| return ret == 0 ? copied : ret; |
| |
| journal_error: |
| reiserfs_write_unlock(inode->i_sb); |
| locked = false; |
| if (th) { |
| if (!update_sd) |
| reiserfs_update_sd(th, inode); |
| ret = reiserfs_end_persistent_transaction(th); |
| } |
| goto out; |
| } |
| |
| int reiserfs_commit_write(struct file *f, struct page *page, |
| unsigned from, unsigned to) |
| { |
| struct inode *inode = page->mapping->host; |
| loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + to; |
| int ret = 0; |
| int update_sd = 0; |
| struct reiserfs_transaction_handle *th = NULL; |
| int depth; |
| |
| depth = reiserfs_write_unlock_nested(inode->i_sb); |
| reiserfs_wait_on_write_block(inode->i_sb); |
| reiserfs_write_lock_nested(inode->i_sb, depth); |
| |
| if (reiserfs_transaction_running(inode->i_sb)) { |
| th = current->journal_info; |
| } |
| reiserfs_commit_page(inode, page, from, to); |
| |
| /* generic_commit_write does this for us, but does not update the |
| ** transaction tracking stuff when the size changes. So, we have |
| ** to do the i_size updates here. |
| */ |
| if (pos > inode->i_size) { |
| struct reiserfs_transaction_handle myth; |
| /* If the file have grown beyond the border where it |
| can have a tail, unmark it as needing a tail |
| packing */ |
| 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; |
| |
| ret = journal_begin(&myth, inode->i_sb, 1); |
| if (ret) |
| goto journal_error; |
| |
| reiserfs_update_inode_transaction(inode); |
| inode->i_size = pos; |
| /* |
| * this will just nest into our transaction. It's important |
| * to use mark_inode_dirty so the inode gets pushed around on the |
| * dirty lists, and so that O_SYNC works as expected |
| */ |
| mark_inode_dirty(inode); |
| reiserfs_update_sd(&myth, inode); |
| update_sd = 1; |
| ret = journal_end(&myth, inode->i_sb, 1); |
| if (ret) |
| goto journal_error; |
| } |
| if (th) { |
| if (!update_sd) |
| mark_inode_dirty(inode); |
| ret = reiserfs_end_persistent_transaction(th); |
| if (ret) |
| goto out; |
| } |
| |
| out: |
| return ret; |
| |
| journal_error: |
| if (th) { |
| if (!update_sd) |
| reiserfs_update_sd(th, inode); |
| ret = reiserfs_end_persistent_transaction(th); |
| } |
| |
| return ret; |
| } |
| |
| void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode) |
| { |
| if (reiserfs_attrs(inode->i_sb)) { |
| if (sd_attrs & REISERFS_SYNC_FL) |
| inode->i_flags |= S_SYNC; |
| else |
| inode->i_flags &= ~S_SYNC; |
| if (sd_attrs & REISERFS_IMMUTABLE_FL) |
| inode->i_flags |= S_IMMUTABLE; |
| else |
| inode->i_flags &= ~S_IMMUTABLE; |
| if (sd_attrs & REISERFS_APPEND_FL) |
| inode->i_flags |= S_APPEND; |
| else |
| inode->i_flags &= ~S_APPEND; |
| if (sd_attrs & REISERFS_NOATIME_FL) |
| inode->i_flags |= S_NOATIME; |
| else |
| inode->i_flags &= ~S_NOATIME; |
| if (sd_attrs & REISERFS_NOTAIL_FL) |
| REISERFS_I(inode)->i_flags |= i_nopack_mask; |
| else |
| REISERFS_I(inode)->i_flags &= ~i_nopack_mask; |
| } |
| } |
| |
| void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs) |
| { |
| if (reiserfs_attrs(inode->i_sb)) { |
| if (inode->i_flags & S_IMMUTABLE) |
| *sd_attrs |= REISERFS_IMMUTABLE_FL; |
| else |
| *sd_attrs &= ~REISERFS_IMMUTABLE_FL; |
| if (inode->i_flags & S_SYNC) |
| *sd_attrs |= REISERFS_SYNC_FL; |
| else |
| *sd_attrs &= ~REISERFS_SYNC_FL; |
| if (inode->i_flags & S_NOATIME) |
| *sd_attrs |= REISERFS_NOATIME_FL; |
| else |
| *sd_attrs &= ~REISERFS_NOATIME_FL; |
| if (REISERFS_I(inode)->i_flags & i_nopack_mask) |
| *sd_attrs |= REISERFS_NOTAIL_FL; |
| else |
| *sd_attrs &= ~REISERFS_NOTAIL_FL; |
| } |
| } |
| |
| /* decide if this buffer needs to stay around for data logging or ordered |
| ** write purposes |
| */ |
| static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh) |
| { |
| int ret = 1; |
| struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb); |
| |
| lock_buffer(bh); |
| spin_lock(&j->j_dirty_buffers_lock); |
| if (!buffer_mapped(bh)) { |
| goto free_jh; |
| } |
| /* the page is locked, and the only places that log a data buffer |
| * also lock the page. |
| */ |
| if (reiserfs_file_data_log(inode)) { |
| /* |
| * very conservative, leave the buffer pinned if |
| * anyone might need it. |
| */ |
| if (buffer_journaled(bh) || buffer_journal_dirty(bh)) { |
| ret = 0; |
| } |
| } else if (buffer_dirty(bh)) { |
| struct reiserfs_journal_list *jl; |
| struct reiserfs_jh *jh = bh->b_private; |
| |
| /* why is this safe? |
| * reiserfs_setattr updates i_size in the on disk |
| * stat data before allowing vmtruncate to be called. |
| * |
| * If buffer was put onto the ordered list for this |
| * transaction, we know for sure either this transaction |
| * or an older one already has updated i_size on disk, |
| * and this ordered data won't be referenced in the file |
| * if we crash. |
| * |
| * if the buffer was put onto the ordered list for an older |
| * transaction, we need to leave it around |
| */ |
| if (jh && (jl = jh->jl) |
| && jl != SB_JOURNAL(inode->i_sb)->j_current_jl) |
| ret = 0; |
| } |
| free_jh: |
| if (ret && bh->b_private) { |
| reiserfs_free_jh(bh); |
| } |
| spin_unlock(&j->j_dirty_buffers_lock); |
| unlock_buffer(bh); |
| return ret; |
| } |
| |
| /* clm -- taken from fs/buffer.c:block_invalidate_page */ |
| static void reiserfs_invalidatepage(struct page *page, unsigned int offset, |
| unsigned int length) |
| { |
| struct buffer_head *head, *bh, *next; |
| struct inode *inode = page->mapping->host; |
| unsigned int curr_off = 0; |
| unsigned int stop = offset + length; |
| int partial_page = (offset || length < PAGE_CACHE_SIZE); |
| int ret = 1; |
| |
| BUG_ON(!PageLocked(page)); |
| |
| if (!partial_page) |
| ClearPageChecked(page); |
| |
| if (!page_has_buffers(page)) |
| goto out; |
| |
| head = page_buffers(page); |
| bh = head; |
| do { |
| unsigned int next_off = curr_off + bh->b_size; |
| next = bh->b_this_page; |
| |
| if (next_off > stop) |
| goto out; |
| |
| /* |
| * is this block fully invalidated? |
| */ |
| if (offset <= curr_off) { |
| if (invalidatepage_can_drop(inode, bh)) |
| reiserfs_unmap_buffer(bh); |
| else |
| ret = 0; |
| } |
| curr_off = next_off; |
| bh = next; |
| } while (bh != head); |
| |
| /* |
| * We release buffers only if the entire page is being invalidated. |
| * The get_block cached value has been unconditionally invalidated, |
| * so real IO is not possible anymore. |
| */ |
| if (!partial_page && ret) { |
| ret = try_to_release_page(page, 0); |
| /* maybe should BUG_ON(!ret); - neilb */ |
| } |
| out: |
| return; |
| } |
| |
| static int reiserfs_set_page_dirty(struct page *page) |
| { |
| struct inode *inode = page->mapping->host; |
| if (reiserfs_file_data_log(inode)) { |
| SetPageChecked(page); |
| return __set_page_dirty_nobuffers(page); |
| } |
| return __set_page_dirty_buffers(page); |
| } |
| |
| /* |
| * Returns 1 if the page's buffers were dropped. The page is locked. |
| * |
| * Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads |
| * in the buffers at page_buffers(page). |
| * |
| * even in -o notail mode, we can't be sure an old mount without -o notail |
| * didn't create files with tails. |
| */ |
| static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
| { |
| struct inode *inode = page->mapping->host; |
| struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb); |
| struct buffer_head *head; |
| struct buffer_head *bh; |
| int ret = 1; |
| |
| WARN_ON(PageChecked(page)); |
| spin_lock(&j->j_dirty_buffers_lock); |
| head = page_buffers(page); |
| bh = head; |
| do { |
| if (bh->b_private) { |
| if (!buffer_dirty(bh) && !buffer_locked(bh)) { |
| reiserfs_free_jh(bh); |
| } else { |
| ret = 0; |
| break; |
| } |
| } |
| bh = bh->b_this_page; |
| } while (bh != head); |
| if (ret) |
| ret = try_to_free_buffers(page); |
| spin_unlock(&j->j_dirty_buffers_lock); |
| return ret; |
| } |
| |
| /* We thank Mingming Cao for helping us understand in great detail what |
| to do in this section of the code. */ |
| static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb, |
| const struct iovec *iov, loff_t offset, |
| unsigned long nr_segs) |
| { |
| struct file *file = iocb->ki_filp; |
| struct inode *inode = file->f_mapping->host; |
| ssize_t ret; |
| |
| ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, |
| reiserfs_get_blocks_direct_io); |
| |
| /* |
| * In case of error extending write may have instantiated a few |
| * blocks outside i_size. Trim these off again. |
| */ |
| if (unlikely((rw & WRITE) && ret < 0)) { |
| loff_t isize = i_size_read(inode); |
| loff_t end = offset + iov_length(iov, nr_segs); |
| |
| if ((end > isize) && inode_newsize_ok(inode, isize) == 0) { |
| truncate_setsize(inode, isize); |
| reiserfs_vfs_truncate_file(inode); |
| } |
| } |
| |
| return ret; |
| } |
| |
| int reiserfs_setattr(struct dentry *dentry, struct iattr *attr) |
| { |
| struct inode *inode = dentry->d_inode; |
| unsigned int ia_valid; |
| int error; |
| |
| error = inode_change_ok(inode, attr); |
| if (error) |
| return error; |
| |
| /* must be turned off for recursive notify_change calls */ |
| ia_valid = attr->ia_valid &= ~(ATTR_KILL_SUID|ATTR_KILL_SGID); |
| |
| if (is_quota_modification(inode, attr)) |
| dquot_initialize(inode); |
| reiserfs_write_lock(inode->i_sb); |
| if (attr->ia_valid & ATTR_SIZE) { |
| /* version 2 items will be caught by the s_maxbytes check |
| ** done for us in vmtruncate |
| */ |
| if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 && |
| attr->ia_size > MAX_NON_LFS) { |
| reiserfs_write_unlock(inode->i_sb); |
| error = -EFBIG; |
| goto out; |
| } |
| |
| inode_dio_wait(inode); |
| |
| /* fill in hole pointers in the expanding truncate case. */ |
| if (attr->ia_size > inode->i_size) { |
| error = generic_cont_expand_simple(inode, attr->ia_size); |
| if (REISERFS_I(inode)->i_prealloc_count > 0) { |
| int err; |
| struct reiserfs_transaction_handle th; |
| /* we're changing at most 2 bitmaps, inode + super */ |
| err = journal_begin(&th, inode->i_sb, 4); |
| if (!err) { |
| reiserfs_discard_prealloc(&th, inode); |
| err = journal_end(&th, inode->i_sb, 4); |
| } |
| if (err) |
| error = err; |
| } |
| if (error) { |
| reiserfs_write_unlock(inode->i_sb); |
| goto out; |
| } |
| /* |
| * file size is changed, ctime and mtime are |
| * to be updated |
| */ |
| attr->ia_valid |= (ATTR_MTIME | ATTR_CTIME); |
| } |
| } |
| reiserfs_write_unlock(inode->i_sb); |
| |
| if ((((attr->ia_valid & ATTR_UID) && (from_kuid(&init_user_ns, attr->ia_uid) & ~0xffff)) || |
| ((attr->ia_valid & ATTR_GID) && (from_kgid(&init_user_ns, attr->ia_gid) & ~0xffff))) && |
| (get_inode_sd_version(inode) == STAT_DATA_V1)) { |
| /* stat data of format v3.5 has 16 bit uid and gid */ |
| error = -EINVAL; |
| goto out; |
| } |
| |
| if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) || |
| (ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) { |
| struct reiserfs_transaction_handle th; |
| int jbegin_count = |
| 2 * |
| (REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb) + |
| REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb)) + |
| 2; |
| |
| error = reiserfs_chown_xattrs(inode, attr); |
| |
| if (error) |
| return error; |
| |
| /* (user+group)*(old+new) structure - we count quota info and , inode write (sb, inode) */ |
| reiserfs_write_lock(inode->i_sb); |
| error = journal_begin(&th, inode->i_sb, jbegin_count); |
| reiserfs_write_unlock(inode->i_sb); |
| if (error) |
| goto out; |
| error = dquot_transfer(inode, attr); |
| reiserfs_write_lock(inode->i_sb); |
| if (error) { |
| journal_end(&th, inode->i_sb, jbegin_count); |
| reiserfs_write_unlock(inode->i_sb); |
| goto out; |
| } |
| |
| /* Update corresponding info in inode so that everything is in |
| * one transaction */ |
| if (attr->ia_valid & ATTR_UID) |
| inode->i_uid = attr->ia_uid; |
| if (attr->ia_valid & ATTR_GID) |
| inode->i_gid = attr->ia_gid; |
| mark_inode_dirty(inode); |
| error = journal_end(&th, inode->i_sb, jbegin_count); |
| reiserfs_write_unlock(inode->i_sb); |
| if (error) |
| goto out; |
| } |
| |
| if ((attr->ia_valid & ATTR_SIZE) && |
| attr->ia_size != i_size_read(inode)) { |
| error = inode_newsize_ok(inode, attr->ia_size); |
| if (!error) { |
| truncate_setsize(inode, attr->ia_size); |
| reiserfs_vfs_truncate_file(inode); |
| } |
| } |
| |
| if (!error) { |
| setattr_copy(inode, attr); |
| mark_inode_dirty(inode); |
| } |
| |
| if (!error && reiserfs_posixacl(inode->i_sb)) { |
| if (attr->ia_valid & ATTR_MODE) |
| error = reiserfs_acl_chmod(inode); |
| } |
| |
| out: |
| return error; |
| } |
| |
| const struct address_space_operations reiserfs_address_space_operations = { |
| .writepage = reiserfs_writepage, |
| .readpage = reiserfs_readpage, |
| .readpages = reiserfs_readpages, |
| .releasepage = reiserfs_releasepage, |
| .invalidatepage = reiserfs_invalidatepage, |
| .write_begin = reiserfs_write_begin, |
| .write_end = reiserfs_write_end, |
| .bmap = reiserfs_aop_bmap, |
| .direct_IO = reiserfs_direct_IO, |
| .set_page_dirty = reiserfs_set_page_dirty, |
| }; |