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-rw-r--r--fs/reiserfs/tail_conversion.c463
1 files changed, 233 insertions, 230 deletions
diff --git a/fs/reiserfs/tail_conversion.c b/fs/reiserfs/tail_conversion.c
index 6191909..c92e124 100644
--- a/fs/reiserfs/tail_conversion.c
+++ b/fs/reiserfs/tail_conversion.c
@@ -11,156 +11,159 @@
/* access to tail : when one is going to read tail it must make sure, that is not running.
direct2indirect and indirect2direct can not run concurrently */
-
/* Converts direct items to an unformatted node. Panics if file has no
tail. -ENOSPC if no disk space for conversion */
/* path points to first direct item of the file regarless of how many of
them are there */
-int direct2indirect (struct reiserfs_transaction_handle *th, struct inode * inode,
- struct path * path, struct buffer_head * unbh,
- loff_t tail_offset)
+int direct2indirect(struct reiserfs_transaction_handle *th, struct inode *inode,
+ struct path *path, struct buffer_head *unbh,
+ loff_t tail_offset)
{
- struct super_block * sb = inode->i_sb;
- struct buffer_head *up_to_date_bh ;
- struct item_head * p_le_ih = PATH_PITEM_HEAD (path);
- unsigned long total_tail = 0 ;
- struct cpu_key end_key; /* Key to search for the last byte of the
- converted item. */
- struct item_head ind_ih; /* new indirect item to be inserted or
- key of unfm pointer to be pasted */
- int n_blk_size,
- n_retval; /* returned value for reiserfs_insert_item and clones */
- unp_t unfm_ptr; /* Handle on an unformatted node
- that will be inserted in the
- tree. */
-
- BUG_ON (!th->t_trans_id);
-
- REISERFS_SB(sb)->s_direct2indirect ++;
-
- n_blk_size = sb->s_blocksize;
-
- /* and key to search for append or insert pointer to the new
- unformatted node. */
- copy_item_head (&ind_ih, p_le_ih);
- set_le_ih_k_offset (&ind_ih, tail_offset);
- set_le_ih_k_type (&ind_ih, TYPE_INDIRECT);
-
- /* Set the key to search for the place for new unfm pointer */
- make_cpu_key (&end_key, inode, tail_offset, TYPE_INDIRECT, 4);
-
- // FIXME: we could avoid this
- if ( search_for_position_by_key (sb, &end_key, path) == POSITION_FOUND ) {
- reiserfs_warning (sb, "PAP-14030: direct2indirect: "
- "pasted or inserted byte exists in the tree %K. "
- "Use fsck to repair.", &end_key);
- pathrelse(path);
- return -EIO;
- }
-
- p_le_ih = PATH_PITEM_HEAD (path);
-
- unfm_ptr = cpu_to_le32 (unbh->b_blocknr);
-
- if ( is_statdata_le_ih (p_le_ih) ) {
- /* Insert new indirect item. */
- set_ih_free_space (&ind_ih, 0); /* delete at nearest future */
- put_ih_item_len( &ind_ih, UNFM_P_SIZE );
- PATH_LAST_POSITION (path)++;
- n_retval = reiserfs_insert_item (th, path, &end_key, &ind_ih, inode,
+ struct super_block *sb = inode->i_sb;
+ struct buffer_head *up_to_date_bh;
+ struct item_head *p_le_ih = PATH_PITEM_HEAD(path);
+ unsigned long total_tail = 0;
+ struct cpu_key end_key; /* Key to search for the last byte of the
+ converted item. */
+ struct item_head ind_ih; /* new indirect item to be inserted or
+ key of unfm pointer to be pasted */
+ int n_blk_size, n_retval; /* returned value for reiserfs_insert_item and clones */
+ unp_t unfm_ptr; /* Handle on an unformatted node
+ that will be inserted in the
+ tree. */
+
+ BUG_ON(!th->t_trans_id);
+
+ REISERFS_SB(sb)->s_direct2indirect++;
+
+ n_blk_size = sb->s_blocksize;
+
+ /* and key to search for append or insert pointer to the new
+ unformatted node. */
+ copy_item_head(&ind_ih, p_le_ih);
+ set_le_ih_k_offset(&ind_ih, tail_offset);
+ set_le_ih_k_type(&ind_ih, TYPE_INDIRECT);
+
+ /* Set the key to search for the place for new unfm pointer */
+ make_cpu_key(&end_key, inode, tail_offset, TYPE_INDIRECT, 4);
+
+ // FIXME: we could avoid this
+ if (search_for_position_by_key(sb, &end_key, path) == POSITION_FOUND) {
+ reiserfs_warning(sb, "PAP-14030: direct2indirect: "
+ "pasted or inserted byte exists in the tree %K. "
+ "Use fsck to repair.", &end_key);
+ pathrelse(path);
+ return -EIO;
+ }
+
+ p_le_ih = PATH_PITEM_HEAD(path);
+
+ unfm_ptr = cpu_to_le32(unbh->b_blocknr);
+
+ if (is_statdata_le_ih(p_le_ih)) {
+ /* Insert new indirect item. */
+ set_ih_free_space(&ind_ih, 0); /* delete at nearest future */
+ put_ih_item_len(&ind_ih, UNFM_P_SIZE);
+ PATH_LAST_POSITION(path)++;
+ n_retval =
+ reiserfs_insert_item(th, path, &end_key, &ind_ih, inode,
(char *)&unfm_ptr);
- } else {
- /* Paste into last indirect item of an object. */
- n_retval = reiserfs_paste_into_item(th, path, &end_key, inode,
- (char *)&unfm_ptr, UNFM_P_SIZE);
- }
- if ( n_retval ) {
- return n_retval;
- }
-
- // note: from here there are two keys which have matching first
- // three key components. They only differ by the fourth one.
-
-
- /* Set the key to search for the direct items of the file */
- make_cpu_key (&end_key, inode, max_reiserfs_offset (inode), TYPE_DIRECT, 4);
-
- /* Move bytes from the direct items to the new unformatted node
- and delete them. */
- while (1) {
- int tail_size;
-
- /* end_key.k_offset is set so, that we will always have found
- last item of the file */
- if ( search_for_position_by_key (sb, &end_key, path) == POSITION_FOUND )
- reiserfs_panic (sb, "PAP-14050: direct2indirect: "
- "direct item (%K) not found", &end_key);
- p_le_ih = PATH_PITEM_HEAD (path);
- RFALSE( !is_direct_le_ih (p_le_ih),
- "vs-14055: direct item expected(%K), found %h",
- &end_key, p_le_ih);
- tail_size = (le_ih_k_offset (p_le_ih) & (n_blk_size - 1))
- + ih_item_len(p_le_ih) - 1;
-
- /* we only send the unbh pointer if the buffer is not up to date.
- ** this avoids overwriting good data from writepage() with old data
- ** from the disk or buffer cache
- ** Special case: unbh->b_page will be NULL if we are coming through
- ** DIRECT_IO handler here.
- */
- if (!unbh->b_page || buffer_uptodate(unbh) || PageUptodate(unbh->b_page)) {
- up_to_date_bh = NULL ;
} else {
- up_to_date_bh = unbh ;
+ /* Paste into last indirect item of an object. */
+ n_retval = reiserfs_paste_into_item(th, path, &end_key, inode,
+ (char *)&unfm_ptr,
+ UNFM_P_SIZE);
}
- n_retval = reiserfs_delete_item (th, path, &end_key, inode,
- up_to_date_bh) ;
-
- total_tail += n_retval ;
- if (tail_size == n_retval)
- // done: file does not have direct items anymore
- break;
-
- }
- /* if we've copied bytes from disk into the page, we need to zero
- ** out the unused part of the block (it was not up to date before)
- */
- if (up_to_date_bh) {
- unsigned pgoff = (tail_offset + total_tail - 1) & (PAGE_CACHE_SIZE - 1);
- char *kaddr=kmap_atomic(up_to_date_bh->b_page, KM_USER0);
- memset(kaddr + pgoff, 0, n_blk_size - total_tail) ;
- kunmap_atomic(kaddr, KM_USER0);
- }
-
- REISERFS_I(inode)->i_first_direct_byte = U32_MAX;
-
- return 0;
-}
+ if (n_retval) {
+ return n_retval;
+ }
+ // note: from here there are two keys which have matching first
+ // three key components. They only differ by the fourth one.
+
+ /* Set the key to search for the direct items of the file */
+ make_cpu_key(&end_key, inode, max_reiserfs_offset(inode), TYPE_DIRECT,
+ 4);
+
+ /* Move bytes from the direct items to the new unformatted node
+ and delete them. */
+ while (1) {
+ int tail_size;
+
+ /* end_key.k_offset is set so, that we will always have found
+ last item of the file */
+ if (search_for_position_by_key(sb, &end_key, path) ==
+ POSITION_FOUND)
+ reiserfs_panic(sb,
+ "PAP-14050: direct2indirect: "
+ "direct item (%K) not found", &end_key);
+ p_le_ih = PATH_PITEM_HEAD(path);
+ RFALSE(!is_direct_le_ih(p_le_ih),
+ "vs-14055: direct item expected(%K), found %h",
+ &end_key, p_le_ih);
+ tail_size = (le_ih_k_offset(p_le_ih) & (n_blk_size - 1))
+ + ih_item_len(p_le_ih) - 1;
+
+ /* we only send the unbh pointer if the buffer is not up to date.
+ ** this avoids overwriting good data from writepage() with old data
+ ** from the disk or buffer cache
+ ** Special case: unbh->b_page will be NULL if we are coming through
+ ** DIRECT_IO handler here.
+ */
+ if (!unbh->b_page || buffer_uptodate(unbh)
+ || PageUptodate(unbh->b_page)) {
+ up_to_date_bh = NULL;
+ } else {
+ up_to_date_bh = unbh;
+ }
+ n_retval = reiserfs_delete_item(th, path, &end_key, inode,
+ up_to_date_bh);
+
+ total_tail += n_retval;
+ if (tail_size == n_retval)
+ // done: file does not have direct items anymore
+ break;
+ }
+ /* if we've copied bytes from disk into the page, we need to zero
+ ** out the unused part of the block (it was not up to date before)
+ */
+ if (up_to_date_bh) {
+ unsigned pgoff =
+ (tail_offset + total_tail - 1) & (PAGE_CACHE_SIZE - 1);
+ char *kaddr = kmap_atomic(up_to_date_bh->b_page, KM_USER0);
+ memset(kaddr + pgoff, 0, n_blk_size - total_tail);
+ kunmap_atomic(kaddr, KM_USER0);
+ }
+
+ REISERFS_I(inode)->i_first_direct_byte = U32_MAX;
+
+ return 0;
+}
/* stolen from fs/buffer.c */
-void reiserfs_unmap_buffer(struct buffer_head *bh) {
- lock_buffer(bh) ;
- if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
- BUG() ;
- }
- clear_buffer_dirty(bh) ;
- /* Remove the buffer from whatever list it belongs to. We are mostly
- interested in removing it from per-sb j_dirty_buffers list, to avoid
- BUG() on attempt to write not mapped buffer */
- if ( (!list_empty(&bh->b_assoc_buffers) || bh->b_private) && bh->b_page) {
- struct inode *inode = bh->b_page->mapping->host;
- struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
- spin_lock(&j->j_dirty_buffers_lock);
- list_del_init(&bh->b_assoc_buffers);
- reiserfs_free_jh(bh);
- spin_unlock(&j->j_dirty_buffers_lock);
- }
- clear_buffer_mapped(bh) ;
- clear_buffer_req(bh) ;
- clear_buffer_new(bh);
- bh->b_bdev = NULL;
- unlock_buffer(bh) ;
+void reiserfs_unmap_buffer(struct buffer_head *bh)
+{
+ lock_buffer(bh);
+ if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
+ BUG();
+ }
+ clear_buffer_dirty(bh);
+ /* Remove the buffer from whatever list it belongs to. We are mostly
+ interested in removing it from per-sb j_dirty_buffers list, to avoid
+ BUG() on attempt to write not mapped buffer */
+ if ((!list_empty(&bh->b_assoc_buffers) || bh->b_private) && bh->b_page) {
+ struct inode *inode = bh->b_page->mapping->host;
+ struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
+ spin_lock(&j->j_dirty_buffers_lock);
+ list_del_init(&bh->b_assoc_buffers);
+ reiserfs_free_jh(bh);
+ spin_unlock(&j->j_dirty_buffers_lock);
+ }
+ clear_buffer_mapped(bh);
+ clear_buffer_req(bh);
+ clear_buffer_new(bh);
+ bh->b_bdev = NULL;
+ unlock_buffer(bh);
}
/* this first locks inode (neither reads nor sync are permitted),
@@ -169,108 +172,108 @@ void reiserfs_unmap_buffer(struct buffer_head *bh) {
what we expect from it (number of cut bytes). But when tail remains
in the unformatted node, we set mode to SKIP_BALANCING and unlock
inode */
-int indirect2direct (struct reiserfs_transaction_handle *th,
- struct inode * p_s_inode,
- struct page *page,
- struct path * p_s_path, /* path to the indirect item. */
- const struct cpu_key * p_s_item_key, /* Key to look for unformatted node pointer to be cut. */
- loff_t n_new_file_size, /* New file size. */
- char * p_c_mode)
+int indirect2direct(struct reiserfs_transaction_handle *th, struct inode *p_s_inode, struct page *page, struct path *p_s_path, /* path to the indirect item. */
+ const struct cpu_key *p_s_item_key, /* Key to look for unformatted node pointer to be cut. */
+ loff_t n_new_file_size, /* New file size. */
+ char *p_c_mode)
{
- struct super_block * p_s_sb = p_s_inode->i_sb;
- struct item_head s_ih;
- unsigned long n_block_size = p_s_sb->s_blocksize;
- char * tail;
- int tail_len, round_tail_len;
- loff_t pos, pos1; /* position of first byte of the tail */
- struct cpu_key key;
+ struct super_block *p_s_sb = p_s_inode->i_sb;
+ struct item_head s_ih;
+ unsigned long n_block_size = p_s_sb->s_blocksize;
+ char *tail;
+ int tail_len, round_tail_len;
+ loff_t pos, pos1; /* position of first byte of the tail */
+ struct cpu_key key;
- BUG_ON (!th->t_trans_id);
+ BUG_ON(!th->t_trans_id);
- REISERFS_SB(p_s_sb)->s_indirect2direct ++;
+ REISERFS_SB(p_s_sb)->s_indirect2direct++;
- *p_c_mode = M_SKIP_BALANCING;
+ *p_c_mode = M_SKIP_BALANCING;
- /* store item head path points to. */
- copy_item_head (&s_ih, PATH_PITEM_HEAD(p_s_path));
-
- tail_len = (n_new_file_size & (n_block_size - 1));
- if (get_inode_sd_version (p_s_inode) == STAT_DATA_V2)
- round_tail_len = ROUND_UP (tail_len);
- else
- round_tail_len = tail_len;
-
- pos = le_ih_k_offset (&s_ih) - 1 + (ih_item_len(&s_ih) / UNFM_P_SIZE - 1) * p_s_sb->s_blocksize;
- pos1 = pos;
-
- // we are protected by i_sem. The tail can not disapper, not
- // append can be done either
- // we are in truncate or packing tail in file_release
-
- tail = (char *)kmap(page) ; /* this can schedule */
-
- if (path_changed (&s_ih, p_s_path)) {
- /* re-search indirect item */
- if ( search_for_position_by_key (p_s_sb, p_s_item_key, p_s_path) == POSITION_NOT_FOUND )
- reiserfs_panic(p_s_sb, "PAP-5520: indirect2direct: "
- "item to be converted %K does not exist", p_s_item_key);
+ /* store item head path points to. */
copy_item_head(&s_ih, PATH_PITEM_HEAD(p_s_path));
+
+ tail_len = (n_new_file_size & (n_block_size - 1));
+ if (get_inode_sd_version(p_s_inode) == STAT_DATA_V2)
+ round_tail_len = ROUND_UP(tail_len);
+ else
+ round_tail_len = tail_len;
+
+ pos =
+ le_ih_k_offset(&s_ih) - 1 + (ih_item_len(&s_ih) / UNFM_P_SIZE -
+ 1) * p_s_sb->s_blocksize;
+ pos1 = pos;
+
+ // we are protected by i_sem. The tail can not disapper, not
+ // append can be done either
+ // we are in truncate or packing tail in file_release
+
+ tail = (char *)kmap(page); /* this can schedule */
+
+ if (path_changed(&s_ih, p_s_path)) {
+ /* re-search indirect item */
+ if (search_for_position_by_key(p_s_sb, p_s_item_key, p_s_path)
+ == POSITION_NOT_FOUND)
+ reiserfs_panic(p_s_sb,
+ "PAP-5520: indirect2direct: "
+ "item to be converted %K does not exist",
+ p_s_item_key);
+ copy_item_head(&s_ih, PATH_PITEM_HEAD(p_s_path));
#ifdef CONFIG_REISERFS_CHECK
- pos = le_ih_k_offset (&s_ih) - 1 +
- (ih_item_len(&s_ih) / UNFM_P_SIZE - 1) * p_s_sb->s_blocksize;
- if (pos != pos1)
- reiserfs_panic (p_s_sb, "vs-5530: indirect2direct: "
- "tail position changed while we were reading it");
+ pos = le_ih_k_offset(&s_ih) - 1 +
+ (ih_item_len(&s_ih) / UNFM_P_SIZE -
+ 1) * p_s_sb->s_blocksize;
+ if (pos != pos1)
+ reiserfs_panic(p_s_sb, "vs-5530: indirect2direct: "
+ "tail position changed while we were reading it");
#endif
- }
-
-
- /* Set direct item header to insert. */
- make_le_item_head (&s_ih, NULL, get_inode_item_key_version (p_s_inode), pos1 + 1,
- TYPE_DIRECT, round_tail_len, 0xffff/*ih_free_space*/);
-
- /* we want a pointer to the first byte of the tail in the page.
- ** the page was locked and this part of the page was up to date when
- ** indirect2direct was called, so we know the bytes are still valid
- */
- tail = tail + (pos & (PAGE_CACHE_SIZE - 1)) ;
-
- PATH_LAST_POSITION(p_s_path)++;
-
- key = *p_s_item_key;
- set_cpu_key_k_type (&key, TYPE_DIRECT);
- key.key_length = 4;
- /* Insert tail as new direct item in the tree */
- if ( reiserfs_insert_item(th, p_s_path, &key, &s_ih, p_s_inode,
- tail ? tail : NULL) < 0 ) {
- /* No disk memory. So we can not convert last unformatted node
- to the direct item. In this case we used to adjust
- indirect items's ih_free_space. Now ih_free_space is not
- used, it would be ideal to write zeros to corresponding
- unformatted node. For now i_size is considered as guard for
- going out of file size */
- kunmap(page) ;
- return n_block_size - round_tail_len;
- }
- kunmap(page) ;
-
- /* make sure to get the i_blocks changes from reiserfs_insert_item */
- reiserfs_update_sd(th, p_s_inode);
+ }
- // note: we have now the same as in above direct2indirect
- // conversion: there are two keys which have matching first three
- // key components. They only differ by the fouhth one.
+ /* Set direct item header to insert. */
+ make_le_item_head(&s_ih, NULL, get_inode_item_key_version(p_s_inode),
+ pos1 + 1, TYPE_DIRECT, round_tail_len,
+ 0xffff /*ih_free_space */ );
+
+ /* we want a pointer to the first byte of the tail in the page.
+ ** the page was locked and this part of the page was up to date when
+ ** indirect2direct was called, so we know the bytes are still valid
+ */
+ tail = tail + (pos & (PAGE_CACHE_SIZE - 1));
+
+ PATH_LAST_POSITION(p_s_path)++;
+
+ key = *p_s_item_key;
+ set_cpu_key_k_type(&key, TYPE_DIRECT);
+ key.key_length = 4;
+ /* Insert tail as new direct item in the tree */
+ if (reiserfs_insert_item(th, p_s_path, &key, &s_ih, p_s_inode,
+ tail ? tail : NULL) < 0) {
+ /* No disk memory. So we can not convert last unformatted node
+ to the direct item. In this case we used to adjust
+ indirect items's ih_free_space. Now ih_free_space is not
+ used, it would be ideal to write zeros to corresponding
+ unformatted node. For now i_size is considered as guard for
+ going out of file size */
+ kunmap(page);
+ return n_block_size - round_tail_len;
+ }
+ kunmap(page);
- /* We have inserted new direct item and must remove last
- unformatted node. */
- *p_c_mode = M_CUT;
+ /* make sure to get the i_blocks changes from reiserfs_insert_item */
+ reiserfs_update_sd(th, p_s_inode);
- /* we store position of first direct item in the in-core inode */
- //mark_file_with_tail (p_s_inode, pos1 + 1);
- REISERFS_I(p_s_inode)->i_first_direct_byte = pos1 + 1;
-
- return n_block_size - round_tail_len;
-}
+ // note: we have now the same as in above direct2indirect
+ // conversion: there are two keys which have matching first three
+ // key components. They only differ by the fouhth one.
+ /* We have inserted new direct item and must remove last
+ unformatted node. */
+ *p_c_mode = M_CUT;
+ /* we store position of first direct item in the in-core inode */
+ //mark_file_with_tail (p_s_inode, pos1 + 1);
+ REISERFS_I(p_s_inode)->i_first_direct_byte = pos1 + 1;
+ return n_block_size - round_tail_len;
+}