diff options
Diffstat (limited to 'fs/reiserfs/inode.c')
| -rw-r--r-- | fs/reiserfs/inode.c | 1063 |
1 files changed, 634 insertions, 429 deletions
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c index b8d3ffb1f722..cc2095943ec6 100644 --- a/fs/reiserfs/inode.c +++ b/fs/reiserfs/inode.c @@ -25,7 +25,10 @@ int reiserfs_commit_write(struct file *f, struct page *page, void reiserfs_evict_inode(struct inode *inode) { - /* We need blocks for transaction + (user+group) quota update (possibly delete) */ + /* + * 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); @@ -39,8 +42,12 @@ void reiserfs_evict_inode(struct inode *inode) 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 */ + /* + * The = 0 happens when we abort creating a new inode + * for some reason like lack of space.. + * also handles bad_inode case + */ + if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { reiserfs_delete_xattrs(inode); @@ -54,9 +61,11 @@ void reiserfs_evict_inode(struct inode *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 */ + /* + * 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); @@ -66,22 +75,29 @@ void reiserfs_evict_inode(struct inode *inode) if (journal_end(&th, inode->i_sb, jbegin_count)) goto out; - /* check return value from reiserfs_delete_object after + /* + * 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 */ + /* + * all items of file are deleted, so we can remove + * "save" link + * we can't do anything about an error here + */ + remove_save_link(inode, 0 /* not truncate */); out: reiserfs_write_unlock(inode->i_sb); } else { /* no object items are in the tree */ ; } - clear_inode(inode); /* note this must go after the journal_end to prevent deadlock */ + + /* note this must go after the journal_end to prevent deadlock */ + clear_inode(inode); + dquot_drop(inode); inode->i_blocks = 0; return; @@ -103,8 +119,10 @@ static void _make_cpu_key(struct cpu_key *key, int version, __u32 dirid, 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 */ +/* + * 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) { @@ -114,9 +132,7 @@ void make_cpu_key(struct cpu_key *key, struct inode *inode, loff_t offset, length); } -// -// when key is 0, do not set version and short key -// +/* 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, @@ -132,43 +148,47 @@ inline void make_le_item_head(struct item_head *ih, const struct cpu_key *key, 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 + /* + * 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 -*/ +/* + * 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.... + */ -/* 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 -*/ +/* + * 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; @@ -186,8 +206,10 @@ static inline void fix_tail_page_for_writing(struct page *page) } } -/* 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 */ +/* + * 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) @@ -211,14 +233,16 @@ static inline void set_block_dev_mapped(struct buffer_head *bh, map_bh(bh, inode->i_sb, block); } -// -// files which were created in the earlier version can not be longer, -// than 2 gb -// +/* + * 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 + /* it is new file. */ + if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 || + /* old file, but 'block' is inside of 2gb */ + block < (1 << (31 - inode->i_sb->s_blocksize_bits))) return 1; return 0; @@ -250,14 +274,14 @@ static int restart_transaction(struct reiserfs_transaction_handle *th, 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. - +/* + * 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) { @@ -273,7 +297,7 @@ static int _get_block_create_0(struct inode *inode, sector_t block, int done = 0; unsigned long offset; - // prepare the key to look for the 'block'-th block of file + /* 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); @@ -285,23 +309,28 @@ static int _get_block_create_0(struct inode *inode, sector_t block, 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. + /* + * We do not return -ENOENT if there is a hole but page is + * uptodate, because it means that there is some MMAPED data + * associated with it that is yet to be written to disk. + */ if ((args & GET_BLOCK_NO_HOLE) && !PageUptodate(bh_result->b_page)) { return -ENOENT; } return 0; } - // + bh = get_last_bh(&path); ih = tp_item_head(&path); if (is_indirect_le_ih(ih)) { __le32 *ind_item = (__le32 *) ih_item_body(bh, ih); - /* FIXME: here we could cache indirect item or part of it in - the inode to avoid search_by_key in case of subsequent - access to file */ + /* + * 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) { @@ -311,8 +340,12 @@ static int _get_block_create_0(struct inode *inode, sector_t block, 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. + /* + * 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; @@ -323,41 +356,45 @@ static int _get_block_create_0(struct inode *inode, sector_t block, kunmap(bh_result->b_page); return ret; } - // requested data are in direct item(s) + /* 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) + /* + * 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 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 + * 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 + /* 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 + /* + * 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); @@ -368,10 +405,11 @@ static int _get_block_create_0(struct inode *inode, sector_t block, 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 + /* + * 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; @@ -390,18 +428,20 @@ static int _get_block_create_0(struct inode *inode, sector_t block, p += chars; + /* + * we done, if read direct item is not the last item of + * node FIXME: we could try to check right delimiting key + * to see whether direct item continues in the right + * neighbor or rely on i_size + */ if (PATH_LAST_POSITION(&path) != (B_NR_ITEMS(bh) - 1)) - // 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 + /* 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 + /* i/o error most likely */ break; bh = get_last_bh(&path); ih = tp_item_head(&path); @@ -416,7 +456,8 @@ static int _get_block_create_0(struct inode *inode, sector_t block, if (result == IO_ERROR) return -EIO; - /* this buffer has valid data, but isn't valid for io. mapping it to + /* + * 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); @@ -424,8 +465,10 @@ static int _get_block_create_0(struct inode *inode, sector_t block, return 0; } -// this is called to create file map. So, _get_block_create_0 will not -// read direct item +/* + * 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) { @@ -439,22 +482,23 @@ static int reiserfs_bmap(struct inode *inode, sector_t block, 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. +/* + * 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, @@ -463,8 +507,10 @@ static int reiserfs_get_block_create_0(struct inode *inode, sector_t block, 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. */ +/* + * 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, @@ -474,9 +520,11 @@ static int reiserfs_get_blocks_direct_io(struct inode *inode, 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() */ + /* + * 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, @@ -486,14 +534,18 @@ static int reiserfs_get_blocks_direct_io(struct inode *inode, /* 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 + /* + * 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 */ + + /* + * Possible unpacked tail. Flush the data before pages have + * disappeared + */ if (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) { int err; @@ -512,15 +564,15 @@ static int reiserfs_get_blocks_direct_io(struct inode *inode, } /* -** 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. -*/ + * 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) @@ -540,9 +592,10 @@ static int convert_tail_for_hole(struct inode *inode, 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 */ + /* + * 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; @@ -553,14 +606,15 @@ static int convert_tail_for_hole(struct inode *inode, 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. + /* + * 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, @@ -604,7 +658,8 @@ 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 + /* b_blocknr_t is (unsigned) 32 bit int*/ + b_blocknr_t allocated_block_nr = 0; INITIALIZE_PATH(path); int pos_in_item; struct cpu_key key; @@ -614,12 +669,14 @@ int reiserfs_get_block(struct inode *inode, sector_t block, 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 */ + /* + * 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); @@ -636,8 +693,9 @@ int reiserfs_get_block(struct inode *inode, sector_t block, 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, 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; @@ -647,6 +705,7 @@ int reiserfs_get_block(struct inode *inode, sector_t block, 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 @@ -655,8 +714,10 @@ int reiserfs_get_block(struct inode *inode, sector_t block, 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 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) @@ -703,11 +764,12 @@ int reiserfs_get_block(struct inode *inode, sector_t block, _allocate_block(th, block, inode, &allocated_block_nr, &path, create); + /* + * restart the transaction to give the journal a chance to free + * some blocks. releases the path, so we have to go back to + * research if we succeed on the second try + */ if (repeat == NO_DISK_SPACE || repeat == QUOTA_EXCEEDED) { - /* 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) @@ -734,9 +796,11 @@ int reiserfs_get_block(struct inode *inode, sector_t block, 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) */ + /* + * '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 */ @@ -764,9 +828,10 @@ int reiserfs_get_block(struct inode *inode, sector_t block, 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 + /* + * 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; } @@ -776,9 +841,11 @@ int reiserfs_get_block(struct inode *inode, sector_t block, 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 */ + /* + * 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)) { @@ -790,16 +857,18 @@ int reiserfs_get_block(struct inode *inode, sector_t block, TYPE_INDIRECT, UNFM_P_SIZE, 0 /* free_space */ ); + /* + * we are going to add 'block'-th block to the file. + * Use allocated block for that + */ if (cpu_key_k_offset(&key) == 1) { - /* 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; // ;) + tmp_key = key; /* ;) */ set_cpu_key_k_offset(&tmp_key, 1); PATH_LAST_POSITION(&path)++; @@ -809,9 +878,12 @@ int reiserfs_get_block(struct inode *inode, sector_t block, if (retval) { reiserfs_free_block(th, inode, allocated_block_nr, 1); - goto failure; // retval == -ENOSPC, -EDQUOT or -EIO or -EEXIST + /* + * retval == -ENOSPC, -EDQUOT or -EIO + * or -EEXIST + */ + goto failure; } - //mark_tail_converted (inode); } else if (is_direct_le_ih(ih)) { /* direct item has to be converted */ loff_t tail_offset; @@ -819,18 +891,24 @@ int reiserfs_get_block(struct inode *inode, sector_t block, tail_offset = ((le_ih_k_offset(ih) - 1) & ~(inode->i_sb->s_blocksize - 1)) + 1; + + /* + * direct item we just found fits into block we have + * to map. Convert it into unformatted node: use + * bh_result for the conversion + */ if (tail_offset == cpu_key_k_offset(&key)) { - /* 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 */ + /* + * we have to pad file tail stored in direct + * item(s) up to block size and convert it + * to unformatted node. FIXME: this should + * also get into page cache + */ pathrelse(&path); /* @@ -859,7 +937,10 @@ int reiserfs_get_block(struct inode *inode, sector_t block, inode->i_ino, retval); if (allocated_block_nr) { - /* the bitmap, the super, and the stat data == 3 */ + /* + * the bitmap, the super, + * and the stat data == 3 + */ if (!th) th = reiserfs_persistent_transaction(inode->i_sb, 3); if (th) @@ -881,43 +962,57 @@ int reiserfs_get_block(struct inode *inode, sector_t block, 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 + /* + * 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 + /* + * 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 + /* + * 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 + /* + * 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()) + * 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 */ + /* + * 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 + /* + * We use this in case we need to allocate + * only one block which is a fastpath + */ + unp_t unf_single = 0; unp_t *un; __u64 max_to_insert = MAX_ITEM_LEN(inode->i_sb->s_blocksize) / @@ -926,14 +1021,17 @@ int reiserfs_get_block(struct inode *inode, sector_t block, 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 */ + /* + * indirect item has to be appended, + * set up key of that position + * (key type is unimportant) + */ make_cpu_key(&tmp_key, inode, le_key_k_offset(version, &(ih->ih_key)) + op_bytes_number(ih, inode->i_sb->s_blocksize), - //pos_in_item * inode->i_sb->s_blocksize, - TYPE_INDIRECT, 3); // key type is unimportant + TYPE_INDIRECT, 3); RFALSE(cpu_key_k_offset(&tmp_key) > cpu_key_k_offset(&key), "green-805: invalid offset"); @@ -954,8 +1052,10 @@ int reiserfs_get_block(struct inode *inode, sector_t block, } } if (blocks_needed <= max_to_insert) { - /* we are going to add target block to the file. Use allocated - block for that */ + /* + * 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, @@ -964,8 +1064,11 @@ int reiserfs_get_block(struct inode *inode, sector_t block, 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 */ + /* + * 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; } @@ -984,9 +1087,12 @@ int reiserfs_get_block(struct inode *inode, sector_t block, 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. */ + /* + * 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; } @@ -995,13 +1101,13 @@ int reiserfs_get_block(struct inode *inode, sector_t block, 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. + /* + * 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); @@ -1060,8 +1166,10 @@ reiserfs_readpages(struct file *file, struct address_space *mapping, 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 +/* + * 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) { @@ -1071,13 +1179,14 @@ static int real_space_diff(struct inode *inode, int sd_size) 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 + /* + * 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 |