/* This function is called by both msync() and fsync().
* TODO: Check if we can avoid calling pmfs_flush_buffer() for fsync. We use
* movnti to write data to files, so we may want to avoid doing unnecessary
* pmfs_flush_buffer() on fsync() */
int pmfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
/* Sync from start to end[inclusive] */
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
loff_t isize;
int error;
/* if the file is not mmap'ed, there is no need to do clflushes */
if (mapping_mapped(mapping) == 0)
goto persist;
end += 1; /* end is inclusive. We like our indices normal please ! */
isize = i_size_read(inode);
if ((unsigned long)end > (unsigned long)isize)
end = isize;
if (!isize || (start >= end))
{
pmfs_dbg_verbose("[%s:%d] : (ERR) isize(%llx), start(%llx),"
" end(%llx)\n", __func__, __LINE__, isize, start, end);
return -ENODATA;
}
/* Align start and end to cacheline boundaries */
start = start & CACHELINE_MASK;
end = CACHELINE_ALIGN(end);
do {
void *xip_mem;
pgoff_t pgoff;
loff_t offset;
unsigned long xip_pfn, nr_flush_bytes;
pgoff = start >> PAGE_CACHE_SHIFT;
offset = start & ~PAGE_CACHE_MASK;
nr_flush_bytes = PAGE_CACHE_SIZE - offset;
if (nr_flush_bytes > (end - start))
nr_flush_bytes = end - start;
error = mapping->a_ops->get_xip_mem(mapping, pgoff, 0,
&xip_mem, &xip_pfn);
if (unlikely(error)) {
/* sparse files could have such holes */
pmfs_dbg_verbose("[%s:%d] : start(%llx), end(%llx),"
" pgoff(%lx)\n", __func__, __LINE__, start, end, pgoff);
} else {
/* flush the range */
pmfs_flush_buffer(xip_mem+offset, nr_flush_bytes, 0);
}
start += nr_flush_bytes;
} while (start < end);
persist:
PERSISTENT_MARK();
PERSISTENT_BARRIER();
return 0;
}
/* Returns new tail after append */
int pmfs_append_link_change_entry(struct super_block *sb,
struct pmfs_inode *pi, struct inode *inode, u64 tail, u64 *new_tail)
{
struct pmfs_inode_info *si = PMFS_I(inode);
struct pmfs_inode_info_header *sih = si->header;
struct pmfs_link_change_entry *entry;
u64 curr_p;
size_t size = sizeof(struct pmfs_link_change_entry);
timing_t append_time;
PMFS_START_TIMING(append_entry_t, append_time);
pmfs_dbg_verbose("%s: inode %lu attr change\n",
__func__, inode->i_ino);
curr_p = pmfs_get_append_head(sb, pi, sih, tail, size, 0, 1);
if (curr_p == 0)
return -ENOMEM;
entry = (struct pmfs_link_change_entry *)pmfs_get_block(sb, curr_p);
entry->entry_type = LINK_CHANGE;
entry->links = cpu_to_le16(inode->i_nlink);
entry->ctime = cpu_to_le32(inode->i_ctime.tv_sec);
entry->flags = cpu_to_le32(inode->i_flags);
entry->generation = cpu_to_le32(inode->i_generation);
pmfs_flush_buffer(entry, size, 0);
*new_tail = curr_p + size;
PMFS_END_TIMING(append_entry_t, append_time);
return 0;
}
/* Caller needs to hold lite_journal_mutex until this returns. */
void pmfs_commit_lite_transaction(struct super_block *sb, u64 tail)
{
struct pmfs_inode *pi;
pi = pmfs_get_inode_by_ino(sb, PMFS_LITEJOURNAL_INO);
if (pi->log_tail != tail)
BUG();
pi->log_head = tail;
pmfs_flush_buffer(&pi->log_head, CACHELINE_SIZE, 1);
}
int pmfs_lite_journal_hard_init(struct super_block *sb)
{
struct pmfs_inode *pi;
unsigned long blocknr = 0;
unsigned long pmfs_ino;
int allocated;
u64 block;
pi = pmfs_get_inode_by_ino(sb, PMFS_LITEJOURNAL_INO);
pmfs_ino = PMFS_LITEJOURNAL_INO;
allocated = pmfs_new_log_blocks(sb, pmfs_ino, &blocknr, 1,
PMFS_BLOCK_TYPE_4K, 1);
pmfs_dbg_verbose("%s: allocate log @ 0x%lx\n", __func__, blocknr);
if (allocated != 1 || blocknr == 0)
return -ENOSPC;
pi->i_blocks = 1;
block = pmfs_get_block_off(sb, blocknr, PMFS_BLOCK_TYPE_4K);
pi->log_head = pi->log_tail = block;
pmfs_flush_buffer(&pi->log_head, CACHELINE_SIZE, 1);
return pmfs_lite_journal_soft_init(sb);
}
static void pmfs_recover_lite_journal_entry(struct super_block *sb,
u64 addr, u64 value, u8 type)
{
switch (type) {
case 1:
*(u8 *)pmfs_get_block(sb, addr) = (u8)value;
break;
case 2:
*(u16 *)pmfs_get_block(sb, addr) = (u16)value;
break;
case 4:
*(u32 *)pmfs_get_block(sb, addr) = (u32)value;
break;
case 8:
*(u64 *)pmfs_get_block(sb, addr) = (u64)value;
break;
default:
pmfs_dbg("%s: unknown data type %u\n",
__func__, type);
break;
}
pmfs_flush_buffer((void *)pmfs_get_block(sb, addr), CACHELINE_SIZE, 0);
}
