/* this first locks inode (neither reads nor sync are permitted),
reads tail through page cache, insert direct item. When direct item
inserted successfully inode is left locked. Return value is always
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)
{
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;
p_s_sb->u.reiserfs_sb.s_indirect2direct ++;
*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);
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");
#endif
}
/* Set direct item header to insert. */
make_le_item_head (&s_ih, 0, 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,
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) ;
/* this will invalidate all the buffers in the page after
** pos1
*/
unmap_buffers(page, pos1) ;
// 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_s_inode->i_blocks += (p_s_sb->s_blocksize / 512);
*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);
p_s_inode->u.reiserfs_i.i_first_direct_byte = pos1 + 1;
return n_block_size - round_tail_len;
}
int indirect2direct(struct reiserfs_transaction_handle *th,
struct inode *inode, struct page *page,
struct treepath *path,
const struct cpu_key *item_key,
loff_t n_new_file_size,
char *mode)
{
struct super_block *sb = inode->i_sb;
struct item_head s_ih;
unsigned long block_size = sb->s_blocksize;
char *tail;
int tail_len, round_tail_len;
loff_t pos, pos1;
struct cpu_key key;
BUG_ON(!th->t_trans_id);
REISERFS_SB(sb)->s_indirect2direct++;
*mode = M_SKIP_BALANCING;
copy_item_head(&s_ih, PATH_PITEM_HEAD(path));
tail_len = (n_new_file_size & (block_size - 1));
if (get_inode_sd_version(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) * sb->s_blocksize;
pos1 = pos;
tail = (char *)kmap(page);
if (path_changed(&s_ih, path)) {
if (search_for_position_by_key(sb, item_key, path)
== POSITION_NOT_FOUND)
reiserfs_panic(sb, "PAP-5520",
"item to be converted %K does not exist",
item_key);
copy_item_head(&s_ih, PATH_PITEM_HEAD(path));
#ifdef CONFIG_REISERFS_CHECK
pos = le_ih_k_offset(&s_ih) - 1 +
(ih_item_len(&s_ih) / UNFM_P_SIZE -
1) * sb->s_blocksize;
if (pos != pos1)
reiserfs_panic(sb, "vs-5530", "tail position "
"changed while we were reading it");
#endif
}
make_le_item_head(&s_ih, NULL, get_inode_item_key_version(inode),
pos1 + 1, TYPE_DIRECT, round_tail_len,
0xffff );
tail = tail + (pos & (PAGE_CACHE_SIZE - 1));
PATH_LAST_POSITION(path)++;
key = *item_key;
set_cpu_key_k_type(&key, TYPE_DIRECT);
key.key_length = 4;
if (reiserfs_insert_item(th, path, &key, &s_ih, inode,
tail ? tail : NULL) < 0) {
kunmap(page);
return block_size - round_tail_len;
}
kunmap(page);
reiserfs_update_sd(th, inode);
*mode = M_CUT;
REISERFS_I(inode)->i_first_direct_byte = pos1 + 1;
return block_size - round_tail_len;
}
/* to protect file being unlinked from getting lost we "safe" link files
being unlinked. This link will be deleted in the same transaction with last
item of file. mounting the filesytem we scan all these links and remove
files which almost got lost */
void add_save_link (struct reiserfs_transaction_handle * th,
struct inode * inode, int truncate)
{
INITIALIZE_PATH (path);
int retval;
struct cpu_key key;
struct item_head ih;
__u32 link;
/* file can only get one "save link" of each kind */
RFALSE( truncate &&
( inode -> u.reiserfs_i.i_flags & i_link_saved_truncate_mask ),
"saved link already exists for truncated inode %lx",
( long ) inode -> i_ino );
RFALSE( !truncate &&
( inode -> u.reiserfs_i.i_flags & i_link_saved_unlink_mask ),
"saved link already exists for unlinked inode %lx",
( long ) inode -> i_ino );
/* setup key of "save" link */
key.version = KEY_FORMAT_3_5;
key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
key.on_disk_key.k_objectid = inode->i_ino;
if (!truncate) {
/* unlink, rmdir, rename */
set_cpu_key_k_offset (&key, 1 + inode->i_sb->s_blocksize);
set_cpu_key_k_type (&key, TYPE_DIRECT);
/* item head of "safe" link */
make_le_item_head (&ih, &key, key.version, 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
4/*length*/, 0xffff/*free space*/);
} else {
/* truncate */
if (S_ISDIR (inode->i_mode))
reiserfs_warning("green-2102: Adding a truncate savelink for a directory %k! Please report\n", INODE_PKEY(inode));
set_cpu_key_k_offset (&key, 1);
set_cpu_key_k_type (&key, TYPE_INDIRECT);
/* item head of "safe" link */
make_le_item_head (&ih, &key, key.version, 1, TYPE_INDIRECT,
4/*length*/, 0/*free space*/);
}
key.key_length = 3;
/* look for its place in the tree */
retval = search_item (inode->i_sb, &key, &path);
if (retval != ITEM_NOT_FOUND) {
if ( retval != -ENOSPC )
reiserfs_warning ("vs-2100: add_save_link:"
"search_by_key (%K) returned %d\n", &key, retval);
pathrelse (&path);
return;
}
/* body of "save" link */
link = cpu_to_le32 (INODE_PKEY (inode)->k_dir_id);
/* put "save" link inot tree */
retval = reiserfs_insert_item (th, &path, &key, &ih, (char *)&link);
if (retval) {
if (retval != -ENOSPC)
reiserfs_warning ("vs-2120: add_save_link: insert_item returned %d\n",
retval);
} else {
if( truncate )
inode -> u.reiserfs_i.i_flags |= i_link_saved_truncate_mask;
else
inode -> u.reiserfs_i.i_flags |= i_link_saved_unlink_mask;
}
}
/*
* this first locks inode (neither reads nor sync are permitted),
* reads tail through page cache, insert direct item. When direct item
* inserted successfully inode is left locked. Return value is always
* 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 *inode, struct page *page,
struct treepath *path, /* path to the indirect item. */
const struct cpu_key *item_key, /* Key to look for
* unformatted node
* pointer to be cut. */
loff_t n_new_file_size, /* New file size. */
char *mode)
{
struct super_block *sb = inode->i_sb;
struct item_head s_ih;
unsigned long block_size = 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);
REISERFS_SB(sb)->s_indirect2direct++;
*mode = M_SKIP_BALANCING;
/* store item head path points to. */
copy_item_head(&s_ih, tp_item_head(path));
tail_len = (n_new_file_size & (block_size - 1));
if (get_inode_sd_version(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) * sb->s_blocksize;
pos1 = pos;
/*
* we are protected by i_mutex. 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, path)) {
/* re-search indirect item */
if (search_for_position_by_key(sb, item_key, path)
== POSITION_NOT_FOUND)
reiserfs_panic(sb, "PAP-5520",
"item to be converted %K does not exist",
item_key);
copy_item_head(&s_ih, tp_item_head(path));
#ifdef CONFIG_REISERFS_CHECK
pos = le_ih_k_offset(&s_ih) - 1 +
(ih_item_len(&s_ih) / UNFM_P_SIZE -
1) * sb->s_blocksize;
if (pos != pos1)
reiserfs_panic(sb, "vs-5530", "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(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_SIZE - 1));
PATH_LAST_POSITION(path)++;
key = *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, path, &key, &s_ih, 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 block_size - round_tail_len;
}
kunmap(page);
/* make sure to get the i_blocks changes from reiserfs_insert_item */
reiserfs_update_sd(th, 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 fourth one.
*/
/*
* We have inserted new direct item and must remove last
* unformatted node.
*/
*mode = M_CUT;
/* we store position of first direct item in the in-core inode */
/* mark_file_with_tail (inode, pos1 + 1); */
REISERFS_I(inode)->i_first_direct_byte = pos1 + 1;
return block_size - round_tail_len;
}
