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dax.c
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dax.c
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/*
* BRIEF DESCRIPTION
*
* DAX file operations.
*
* Copyright 2015-2016 Regents of the University of California,
* UCSD Non-Volatile Systems Lab, Andiry Xu <jix024@cs.ucsd.edu>
* Copyright 2012-2013 Intel Corporation
* Copyright 2009-2011 Marco Stornelli <marco.stornelli@gmail.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/module.h>
#include <linux/buffer_head.h>
#include <linux/cpufeature.h>
#include <asm/pgtable.h>
#include <linux/version.h>
#include "nova.h"
#include "inode.h"
static inline int nova_copy_partial_block(struct super_block *sb,
struct nova_inode_info_header *sih,
struct nova_file_write_entry *entry, unsigned long index,
size_t offset, size_t length, void *kmem)
{
void *ptr;
int rc = 0;
unsigned long nvmm;
nvmm = get_nvmm(sb, sih, entry, index);
ptr = nova_get_block(sb, (nvmm << PAGE_SHIFT));
if (ptr != NULL) {
if (support_clwb)
rc = memcpy_mcsafe(kmem + offset, ptr + offset,
length);
else
memcpy_to_pmem_nocache(kmem + offset, ptr + offset,
length);
}
/* TODO: If rc < 0, go to MCE data recovery. */
return rc;
}
static inline int nova_handle_partial_block(struct super_block *sb,
struct nova_inode_info_header *sih,
struct nova_file_write_entry *entry, unsigned long index,
size_t offset, size_t length, void *kmem)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct nova_file_write_entry *entryc, entry_copy;
nova_memunlock_block(sb, kmem);
if (entry == NULL) {
/* Fill zero */
if (support_clwb)
memset(kmem + offset, 0, length);
else
memcpy_to_pmem_nocache(kmem + offset,
sbi->zeroed_page, length);
} else {
/* Copy from original block */
if (metadata_csum == 0)
entryc = entry;
else {
entryc = &entry_copy;
if (!nova_verify_entry_csum(sb, entry, entryc))
return -EIO;
}
nova_copy_partial_block(sb, sih, entryc, index,
offset, length, kmem);
}
nova_memlock_block(sb, kmem);
if (support_clwb)
nova_flush_buffer(kmem + offset, length, 0);
return 0;
}
/*
* Fill the new start/end block from original blocks.
* Do nothing if fully covered; copy if original blocks present;
* Fill zero otherwise.
*/
int nova_handle_head_tail_blocks(struct super_block *sb,
struct inode *inode, loff_t pos, size_t count, void *kmem)
{
struct nova_inode_info *si = NOVA_I(inode);
struct nova_inode_info_header *sih = &si->header;
size_t offset, eblk_offset;
unsigned long start_blk, end_blk, num_blocks;
struct nova_file_write_entry *entry;
timing_t partial_time;
int ret = 0;
NOVA_START_TIMING(partial_block_t, partial_time);
offset = pos & (sb->s_blocksize - 1);
num_blocks = ((count + offset - 1) >> sb->s_blocksize_bits) + 1;
/* offset in the actual block size block */
offset = pos & (nova_inode_blk_size(sih) - 1);
start_blk = pos >> sb->s_blocksize_bits;
end_blk = start_blk + num_blocks - 1;
nova_dbg_verbose("%s: %lu blocks\n", __func__, num_blocks);
/* We avoid zeroing the alloc'd range, which is going to be overwritten
* by this system call anyway
*/
nova_dbg_verbose("%s: start offset %lu start blk %lu %p\n", __func__,
offset, start_blk, kmem);
if (offset != 0) {
entry = nova_get_write_entry(sb, sih, start_blk);
ret = nova_handle_partial_block(sb, sih, entry,
start_blk, 0, offset, kmem);
if (ret < 0)
return ret;
}
kmem = (void *)((char *)kmem +
((num_blocks - 1) << sb->s_blocksize_bits));
eblk_offset = (pos + count) & (nova_inode_blk_size(sih) - 1);
nova_dbg_verbose("%s: end offset %lu, end blk %lu %p\n", __func__,
eblk_offset, end_blk, kmem);
if (eblk_offset != 0) {
entry = nova_get_write_entry(sb, sih, end_blk);
ret = nova_handle_partial_block(sb, sih, entry, end_blk,
eblk_offset,
sb->s_blocksize - eblk_offset,
kmem);
if (ret < 0)
return ret;
}
NOVA_END_TIMING(partial_block_t, partial_time);
return ret;
}
int nova_reassign_file_tree(struct super_block *sb,
struct nova_inode_info_header *sih, u64 begin_tail)
{
void *addr;
struct nova_file_write_entry *entry;
struct nova_file_write_entry *entryc, entry_copy;
u64 curr_p = begin_tail;
size_t entry_size = sizeof(struct nova_file_write_entry);
entryc = (metadata_csum == 0) ? entry : &entry_copy;
while (curr_p && curr_p != sih->log_tail) {
if (is_last_entry(curr_p, entry_size))
curr_p = next_log_page(sb, curr_p);
if (curr_p == 0) {
nova_err(sb, "%s: File inode %lu log is NULL!\n",
__func__, sih->ino);
return -EINVAL;
}
addr = (void *) nova_get_block(sb, curr_p);
entry = (struct nova_file_write_entry *) addr;
if (metadata_csum == 0)
entryc = entry;
else if (!nova_verify_entry_csum(sb, entry, entryc))
return -EIO;
if (nova_get_entry_type(entryc) != FILE_WRITE) {
nova_dbg("%s: entry type is not write? %d\n",
__func__, nova_get_entry_type(entry));
curr_p += entry_size;
continue;
}
nova_assign_write_entry(sb, sih, entry, entryc, true);
curr_p += entry_size;
}
return 0;
}
int nova_cleanup_incomplete_write(struct super_block *sb,
struct nova_inode_info_header *sih, unsigned long blocknr,
int allocated, u64 begin_tail, u64 end_tail)
{
void *addr;
struct nova_file_write_entry *entry;
struct nova_file_write_entry *entryc, entry_copy;
u64 curr_p = begin_tail;
size_t entry_size = sizeof(struct nova_file_write_entry);
if (blocknr > 0 && allocated > 0)
nova_free_data_blocks(sb, sih, blocknr, allocated);
if (begin_tail == 0 || end_tail == 0)
return 0;
entryc = (metadata_csum == 0) ? entry : &entry_copy;
while (curr_p != end_tail) {
if (is_last_entry(curr_p, entry_size))
curr_p = next_log_page(sb, curr_p);
if (curr_p == 0) {
nova_err(sb, "%s: File inode %lu log is NULL!\n",
__func__, sih->ino);
return -EINVAL;
}
addr = (void *) nova_get_block(sb, curr_p);
entry = (struct nova_file_write_entry *) addr;
if (metadata_csum == 0)
entryc = entry;
else {
/* skip entry check here as the entry checksum may not
* be updated when this is called
*/
if (memcpy_mcsafe(entryc, entry,
sizeof(struct nova_file_write_entry)))
return -EIO;
}
if (nova_get_entry_type(entryc) != FILE_WRITE) {
nova_dbg("%s: entry type is not write? %d\n",
__func__, nova_get_entry_type(entry));
curr_p += entry_size;
continue;
}
blocknr = entryc->block >> PAGE_SHIFT;
nova_free_data_blocks(sb, sih, blocknr, entryc->num_pages);
curr_p += entry_size;
}
return 0;
}
void nova_init_file_write_entry(struct super_block *sb,
struct nova_inode_info_header *sih, struct nova_file_write_entry *entry,
u64 epoch_id, u64 pgoff, int num_pages, u64 blocknr, u32 time,
u64 file_size)
{
memset(entry, 0, sizeof(struct nova_file_write_entry));
entry->entry_type = FILE_WRITE;
entry->reassigned = 0;
entry->updating = 0;
entry->epoch_id = epoch_id;
entry->trans_id = sih->trans_id;
entry->pgoff = cpu_to_le64(pgoff);
entry->num_pages = cpu_to_le32(num_pages);
entry->invalid_pages = 0;
entry->block = cpu_to_le64(nova_get_block_off(sb, blocknr,
sih->i_blk_type));
entry->mtime = cpu_to_le32(time);
entry->size = file_size;
}
int nova_protect_file_data(struct super_block *sb, struct inode *inode,
loff_t pos, size_t count, const char __user *buf, unsigned long blocknr,
bool inplace)
{
struct nova_inode_info *si = NOVA_I(inode);
struct nova_inode_info_header *sih = &si->header;
size_t offset, eblk_offset, bytes, left;
unsigned long start_blk, end_blk, num_blocks, nvmm, nvmmoff;
unsigned long blocksize = sb->s_blocksize;
unsigned int blocksize_bits = sb->s_blocksize_bits;
u8 *blockbuf, *blockptr;
struct nova_file_write_entry *entry;
struct nova_file_write_entry *entryc, entry_copy;
bool mapped, nvmm_ok;
int ret = 0;
timing_t protect_file_data_time, memcpy_time;
NOVA_START_TIMING(protect_file_data_t, protect_file_data_time);
offset = pos & (blocksize - 1);
num_blocks = ((offset + count - 1) >> blocksize_bits) + 1;
start_blk = pos >> blocksize_bits;
end_blk = start_blk + num_blocks - 1;
NOVA_START_TIMING(protect_memcpy_t, memcpy_time);
blockbuf = kmalloc(blocksize, GFP_KERNEL);
if (blockbuf == NULL) {
nova_err(sb, "%s: block buffer allocation error\n", __func__);
return -ENOMEM;
}
bytes = blocksize - offset;
if (bytes > count)
bytes = count;
left = copy_from_user(blockbuf + offset, buf, bytes);
NOVA_END_TIMING(protect_memcpy_t, memcpy_time);
if (unlikely(left != 0)) {
nova_err(sb, "%s: not all data is copied from user! expect to copy %zu bytes, actually copied %zu bytes\n",
__func__, bytes, bytes - left);
ret = -EFAULT;
goto out;
}
entryc = (metadata_csum == 0) ? entry : &entry_copy;
if (offset != 0) {
NOVA_STATS_ADD(protect_head, 1);
entry = nova_get_write_entry(sb, sih, start_blk);
if (entry != NULL) {
if (metadata_csum == 0)
entryc = entry;
else if (!nova_verify_entry_csum(sb, entry, entryc))
return -EIO;
/* make sure data in the partial block head is good */
nvmm = get_nvmm(sb, sih, entryc, start_blk);
nvmmoff = nova_get_block_off(sb, nvmm, sih->i_blk_type);
blockptr = (u8 *) nova_get_block(sb, nvmmoff);
mapped = nova_find_pgoff_in_vma(inode, start_blk);
if (data_csum > 0 && !mapped && !inplace) {
nvmm_ok = nova_verify_data_csum(sb, sih, nvmm,
0, offset);
if (!nvmm_ok) {
ret = -EIO;
goto out;
}
}
ret = memcpy_mcsafe(blockbuf, blockptr, offset);
if (ret < 0)
goto out;
} else {
memset(blockbuf, 0, offset);
}
/* copying existing checksums from nvmm can be even slower than
* re-computing checksums of a whole block.
if (data_csum > 0)
nova_copy_partial_block_csum(sb, sih, entry, start_blk,
offset, blocknr, false);
*/
}
if (num_blocks == 1)
goto eblk;
do {
if (inplace)
nova_update_block_csum_parity(sb, sih, blockbuf,
blocknr, offset, bytes);
else
nova_update_block_csum_parity(sb, sih, blockbuf,
blocknr, 0, blocksize);
blocknr++;
pos += bytes;
buf += bytes;
count -= bytes;
offset = pos & (blocksize - 1);
bytes = count < blocksize ? count : blocksize;
left = copy_from_user(blockbuf, buf, bytes);
if (unlikely(left != 0)) {
nova_err(sb, "%s: not all data is copied from user! expect to copy %zu bytes, actually copied %zu bytes\n",
__func__, bytes, bytes - left);
ret = -EFAULT;
goto out;
}
} while (count > blocksize);
eblk:
eblk_offset = (pos + count) & (blocksize - 1);
if (eblk_offset != 0) {
NOVA_STATS_ADD(protect_tail, 1);
entry = nova_get_write_entry(sb, sih, end_blk);
if (entry != NULL) {
if (metadata_csum == 0)
entryc = entry;
else if (!nova_verify_entry_csum(sb, entry, entryc))
return -EIO;
/* make sure data in the partial block tail is good */
nvmm = get_nvmm(sb, sih, entryc, end_blk);
nvmmoff = nova_get_block_off(sb, nvmm, sih->i_blk_type);
blockptr = (u8 *) nova_get_block(sb, nvmmoff);
mapped = nova_find_pgoff_in_vma(inode, end_blk);
if (data_csum > 0 && !mapped && !inplace) {
nvmm_ok = nova_verify_data_csum(sb, sih, nvmm,
eblk_offset, blocksize - eblk_offset);
if (!nvmm_ok) {
ret = -EIO;
goto out;
}
}
ret = memcpy_mcsafe(blockbuf + eblk_offset,
blockptr + eblk_offset,
blocksize - eblk_offset);
if (ret < 0)
goto out;
} else {
memset(blockbuf + eblk_offset, 0,
blocksize - eblk_offset);
}
/* copying existing checksums from nvmm can be even slower than
* re-computing checksums of a whole block.
if (data_csum > 0)
nova_copy_partial_block_csum(sb, sih, entry, end_blk,
eblk_offset, blocknr, true);
*/
}
if (inplace)
nova_update_block_csum_parity(sb, sih, blockbuf, blocknr,
offset, bytes);
else
nova_update_block_csum_parity(sb, sih, blockbuf, blocknr,
0, blocksize);
out:
if (blockbuf != NULL)
kfree(blockbuf);
NOVA_END_TIMING(protect_file_data_t, protect_file_data_time);
return ret;
}
static bool nova_get_verify_entry(struct super_block *sb,
struct nova_file_write_entry *entry,
struct nova_file_write_entry *entryc,
int locked)
{
int ret = 0;
if (metadata_csum == 0)
return true;
if (locked == 0) {
/* Someone else may be updating the entry. Skip check */
ret = memcpy_mcsafe(entryc, entry,
sizeof(struct nova_file_write_entry));
if (ret < 0)
return false;
return true;
}
return nova_verify_entry_csum(sb, entry, entryc);
}
/*
* Check if there is an existing entry for target page offset.
* Used for inplace write, direct IO, DAX-mmap and fallocate.
*/
unsigned long nova_check_existing_entry(struct super_block *sb,
struct inode *inode, unsigned long num_blocks, unsigned long start_blk,
struct nova_file_write_entry **ret_entry,
struct nova_file_write_entry *ret_entryc, int check_next, u64 epoch_id,
int *inplace, int locked)
{
struct nova_inode_info *si = NOVA_I(inode);
struct nova_inode_info_header *sih = &si->header;
struct nova_file_write_entry *entry;
struct nova_file_write_entry *entryc;
unsigned long next_pgoff;
unsigned long ent_blks = 0;
timing_t check_time;
NOVA_START_TIMING(check_entry_t, check_time);
*ret_entry = NULL;
*inplace = 0;
entry = nova_get_write_entry(sb, sih, start_blk);
entryc = (metadata_csum == 0) ? entry : ret_entryc;
if (entry) {
if (metadata_csum == 0)
entryc = entry;
else if (!nova_get_verify_entry(sb, entry, entryc, locked))
goto out;
*ret_entry = entry;
/* We can do inplace write. Find contiguous blocks */
if (entryc->reassigned == 0)
ent_blks = entryc->num_pages -
(start_blk - entryc->pgoff);
else
ent_blks = 1;
if (ent_blks > num_blocks)
ent_blks = num_blocks;
if (entryc->epoch_id == epoch_id)
*inplace = 1;
} else if (check_next) {
/* Possible Hole */
entry = nova_find_next_entry(sb, sih, start_blk);
if (entry) {
if (metadata_csum == 0)
entryc = entry;
else if (!nova_get_verify_entry(sb, entry, entryc,
locked))
goto out;
next_pgoff = entryc->pgoff;
if (next_pgoff <= start_blk) {
nova_err(sb, "iblock %lu, entry pgoff %lu, num pages %lu\n",
start_blk, next_pgoff, entry->num_pages);
nova_print_inode_log(sb, inode);
BUG();
ent_blks = num_blocks;
goto out;
}
ent_blks = next_pgoff - start_blk;
if (ent_blks > num_blocks)
ent_blks = num_blocks;
} else {
/* File grow */
ent_blks = num_blocks;
}
}
if (entry && ent_blks == 0) {
nova_dbg("%s: %d\n", __func__, check_next);
dump_stack();
}
out:
NOVA_END_TIMING(check_entry_t, check_time);
return ent_blks;
}
/*
* Do an inplace write. This function assumes that the lock on the inode is
* already held.
*/
ssize_t do_nova_inplace_file_write(struct file *filp,
const char __user *buf, size_t len, loff_t *ppos)
{
struct address_space *mapping = filp->f_mapping;
struct inode *inode = mapping->host;
struct nova_inode_info *si = NOVA_I(inode);
struct nova_inode_info_header *sih = &si->header;
struct super_block *sb = inode->i_sb;
struct nova_inode *pi, inode_copy;
struct nova_file_write_entry *entry;
struct nova_file_write_entry *entryc, entry_copy;
struct nova_file_write_entry entry_data;
struct nova_inode_update update;
ssize_t written = 0;
loff_t pos;
size_t count, offset, copied;
unsigned long start_blk, num_blocks, ent_blks = 0;
unsigned long total_blocks;
unsigned long new_blocks = 0;
unsigned long blocknr = 0;
unsigned int data_bits;
int allocated = 0;
int inplace = 0;
bool hole_fill = false;
bool update_log = false;
void *kmem;
u64 blk_off;
size_t bytes;
long status = 0;
timing_t inplace_write_time, memcpy_time;
unsigned long step = 0;
u64 begin_tail = 0;
u64 epoch_id;
u64 file_size;
u32 time;
ssize_t ret;
if (len == 0)
return 0;
NOVA_START_TIMING(inplace_write_t, inplace_write_time);
if (!access_ok(VERIFY_READ, buf, len)) {
ret = -EFAULT;
goto out;
}
pos = *ppos;
if (filp->f_flags & O_APPEND)
pos = i_size_read(inode);
count = len;
pi = nova_get_block(sb, sih->pi_addr);
/* nova_inode tail pointer will be updated and we make sure all other
* inode fields are good before checksumming the whole structure
*/
if (nova_check_inode_integrity(sb, sih->ino, sih->pi_addr,
sih->alter_pi_addr, &inode_copy, 0) < 0) {
ret = -EIO;
goto out;
}
offset = pos & (sb->s_blocksize - 1);
num_blocks = ((count + offset - 1) >> sb->s_blocksize_bits) + 1;
total_blocks = num_blocks;
/* offset in the actual block size block */
ret = file_remove_privs(filp);
if (ret)
goto out;
inode->i_ctime = inode->i_mtime = current_time(inode);
time = current_time(inode).tv_sec;
epoch_id = nova_get_epoch_id(sb);
nova_dbgv("%s: epoch_id %llu, inode %lu, offset %lld, count %lu\n",
__func__, epoch_id, inode->i_ino, pos, count);
update.tail = sih->log_tail;
update.alter_tail = sih->alter_log_tail;
while (num_blocks > 0) {
hole_fill = false;
offset = pos & (nova_inode_blk_size(sih) - 1);
start_blk = pos >> sb->s_blocksize_bits;
ent_blks = nova_check_existing_entry(sb, inode, num_blocks,
start_blk, &entry, &entry_copy,
1, epoch_id, &inplace, 1);
entryc = (metadata_csum == 0) ? entry : &entry_copy;
if (entry && inplace) {
/* We can do inplace write. Find contiguous blocks */
blocknr = get_nvmm(sb, sih, entryc, start_blk);
blk_off = blocknr << PAGE_SHIFT;
allocated = ent_blks;
if (data_csum || data_parity)
nova_set_write_entry_updating(sb, entry, 1);
} else {
/* Allocate blocks to fill hole */
allocated = nova_new_data_blocks(sb, sih, &blocknr,
start_blk, ent_blks, ALLOC_NO_INIT,
ANY_CPU, ALLOC_FROM_HEAD);
nova_dbg_verbose("%s: alloc %d blocks @ %lu\n",
__func__, allocated, blocknr);
if (allocated <= 0) {
nova_dbg("%s alloc blocks failed!, %d\n",
__func__, allocated);
ret = allocated;
goto out;
}
hole_fill = true;
new_blocks += allocated;
blk_off = nova_get_block_off(sb, blocknr,
sih->i_blk_type);
}
step++;
bytes = sb->s_blocksize * allocated - offset;
if (bytes > count)
bytes = count;
kmem = nova_get_block(inode->i_sb, blk_off);
if (hole_fill &&
(offset || ((offset + bytes) & (PAGE_SIZE - 1)) != 0)) {
ret = nova_handle_head_tail_blocks(sb, inode,
pos, bytes, kmem);
if (ret)
goto out;
}
/* Now copy from user buf */
// nova_dbg("Write: %p\n", kmem);
NOVA_START_TIMING(memcpy_w_nvmm_t, memcpy_time);
nova_memunlock_range(sb, kmem + offset, bytes);
copied = bytes - memcpy_to_pmem_nocache(kmem + offset,
buf, bytes);
nova_memlock_range(sb, kmem + offset, bytes);
NOVA_END_TIMING(memcpy_w_nvmm_t, memcpy_time);
if (data_csum > 0 || data_parity > 0) {
ret = nova_protect_file_data(sb, inode, pos, bytes,
buf, blocknr, !hole_fill);
if (ret)
goto out;
}
if (pos + copied > inode->i_size)
file_size = cpu_to_le64(pos + copied);
else
file_size = cpu_to_le64(inode->i_size);
/* Handle hole fill write */
if (hole_fill) {
nova_init_file_write_entry(sb, sih, &entry_data,
epoch_id, start_blk, allocated,
blocknr, time, file_size);
ret = nova_append_file_write_entry(sb, pi, inode,
&entry_data, &update);
if (ret) {
nova_dbg("%s: append inode entry failed\n",
__func__);
ret = -ENOSPC;
goto out;
}
} else {
/* Update existing entry */
struct nova_log_entry_info entry_info;
entry_info.type = FILE_WRITE;
entry_info.epoch_id = epoch_id;
entry_info.trans_id = sih->trans_id;
entry_info.time = time;
entry_info.file_size = file_size;
entry_info.inplace = 1;
nova_inplace_update_write_entry(sb, inode, entry,
&entry_info);
}
nova_dbgv("Write: %p, %lu\n", kmem, copied);
if (copied > 0) {
status = copied;
written += copied;
pos += copied;
buf += copied;
count -= copied;
num_blocks -= allocated;
}
if (unlikely(copied != bytes)) {
nova_dbg("%s ERROR!: %p, bytes %lu, copied %lu\n",
__func__, kmem, bytes, copied);
if (status >= 0)
status = -EFAULT;
}
if (status < 0)
break;
if (hole_fill) {
update_log = true;
if (begin_tail == 0)
begin_tail = update.curr_entry;
}
}
data_bits = blk_type_to_shift[sih->i_blk_type];
sih->i_blocks += (new_blocks << (data_bits - sb->s_blocksize_bits));
inode->i_blocks = sih->i_blocks;
if (update_log) {
nova_memunlock_inode(sb, pi);
nova_update_inode(sb, inode, pi, &update, 1);
nova_memlock_inode(sb, pi);
NOVA_STATS_ADD(inplace_new_blocks, 1);
/* Update file tree */
ret = nova_reassign_file_tree(sb, sih, begin_tail);
if (ret)
goto out;
}
ret = written;
NOVA_STATS_ADD(inplace_write_breaks, step);
nova_dbgv("blocks: %lu, %lu\n", inode->i_blocks, sih->i_blocks);
*ppos = pos;
if (pos > inode->i_size) {
i_size_write(inode, pos);
sih->i_size = pos;
}
sih->trans_id++;
out:
if (ret < 0)
nova_cleanup_incomplete_write(sb, sih, blocknr, allocated,
begin_tail, update.tail);
NOVA_END_TIMING(inplace_write_t, inplace_write_time);
NOVA_STATS_ADD(inplace_write_bytes, written);
return ret;
}
/*
* Acquire locks and perform an inplace update.
*/
ssize_t nova_inplace_file_write(struct file *filp,
const char __user *buf, size_t len, loff_t *ppos)
{
struct address_space *mapping = filp->f_mapping;
struct inode *inode = mapping->host;
int ret;
if (len == 0)
return 0;
sb_start_write(inode->i_sb);
inode_lock(inode);
ret = do_nova_inplace_file_write(filp, buf, len, ppos);
inode_unlock(inode);
sb_end_write(inode->i_sb);
return ret;
}
/* Check if existing entry overlap with vma regions */
int nova_check_overlap_vmas(struct super_block *sb,
struct nova_inode_info_header *sih,
unsigned long pgoff, unsigned long num_pages)
{
unsigned long start_pgoff = 0;
unsigned long num = 0;
unsigned long i;
struct vma_item *item;
struct rb_node *temp;
int ret = 0;
if (sih->num_vmas == 0)
return 0;
temp = rb_first(&sih->vma_tree);
while (temp) {
item = container_of(temp, struct vma_item, node);
temp = rb_next(temp);
ret = nova_get_vma_overlap_range(sb, sih, item->vma, pgoff,
num_pages, &start_pgoff, &num);
if (ret) {
for (i = 0; i < num; i++) {
if (nova_get_write_entry(sb, sih,
start_pgoff + i))
return 1;
}
}
}
return 0;
}
/*
* return > 0, # of blocks mapped or allocated.
* return = 0, if plain lookup failed.
* return < 0, error case.
*/
static int nova_dax_get_blocks(struct inode *inode, sector_t iblock,
unsigned long max_blocks, u32 *bno, bool *new, bool *boundary,
int create, bool taking_lock)
{
struct super_block *sb = inode->i_sb;
struct nova_inode *pi;
struct nova_inode_info *si = NOVA_I(inode);
struct nova_inode_info_header *sih = &si->header;
struct nova_file_write_entry *entry = NULL;
struct nova_file_write_entry *entryc, entry_copy;
struct nova_file_write_entry entry_data;
struct nova_inode_update update;
u32 time;
unsigned int data_bits;
unsigned long nvmm = 0;
unsigned long blocknr = 0;
u64 epoch_id;
int num_blocks = 0;
int inplace = 0;
int allocated = 0;
int locked = 0;
int check_next = 1;
int ret = 0;
timing_t get_block_time;
if (max_blocks == 0)
return 0;
NOVA_START_TIMING(dax_get_block_t, get_block_time);
nova_dbgv("%s: pgoff %lu, num %lu, create %d\n",
__func__, iblock, max_blocks, create);
epoch_id = nova_get_epoch_id(sb);
if (taking_lock)
check_next = 0;
again:
num_blocks = nova_check_existing_entry(sb, inode, max_blocks,
iblock, &entry, &entry_copy, check_next,
epoch_id, &inplace, locked);
entryc = (metadata_csum == 0) ? entry : &entry_copy;
if (entry) {
if (create == 0 || inplace) {
nvmm = get_nvmm(sb, sih, entryc, iblock);
nova_dbgv("%s: found pgoff %lu, block %lu\n",
__func__, iblock, nvmm);
goto out;
}
}
if (create == 0) {
num_blocks = 0;
goto out1;
}
if (taking_lock && locked == 0) {
inode_lock(inode);
locked = 1;
/* Check again incase someone has done it for us */
check_next = 1;
goto again;
}
pi = nova_get_inode(sb, inode);
inode->i_ctime = inode->i_mtime = current_time(inode);
time = current_time(inode).tv_sec;
update.tail = sih->log_tail;
update.alter_tail = sih->alter_log_tail;
/* Return initialized blocks to the user */
allocated = nova_new_data_blocks(sb, sih, &blocknr, iblock,
num_blocks, ALLOC_INIT_ZERO, ANY_CPU,
ALLOC_FROM_HEAD);
if (allocated <= 0) {
nova_dbgv("%s alloc blocks failed %d\n", __func__,
allocated);
ret = allocated;
goto out;
}
num_blocks = allocated;
/* Do not extend file size */
nova_init_file_write_entry(sb, sih, &entry_data,
epoch_id, iblock, num_blocks,
blocknr, time, inode->i_size);
ret = nova_append_file_write_entry(sb, pi, inode,
&entry_data, &update);
if (ret) {
nova_dbgv("%s: append inode entry failed\n", __func__);
ret = -ENOSPC;
goto out;
}
nvmm = blocknr;
data_bits = blk_type_to_shift[sih->i_blk_type];
sih->i_blocks += (num_blocks << (data_bits - sb->s_blocksize_bits));
nova_memunlock_inode(sb, pi);
nova_update_inode(sb, inode, pi, &update, 1);
nova_memlock_inode(sb, pi);
ret = nova_reassign_file_tree(sb, sih, update.curr_entry);
if (ret) {
nova_dbgv("%s: nova_reassign_file_tree failed: %d\n",
__func__, ret);
goto out;
}
inode->i_blocks = sih->i_blocks;
sih->trans_id++;
NOVA_STATS_ADD(dax_new_blocks, 1);
// set_buffer_new(bh);
out:
if (ret < 0) {
nova_cleanup_incomplete_write(sb, sih, blocknr, allocated,
0, update.tail);
num_blocks = ret;
goto out1;
}
*bno = nvmm;
// if (num_blocks > 1)
// bh->b_size = sb->s_blocksize * num_blocks;
out1:
if (taking_lock && locked)