提交 29ac8e85 编写于 作者: D Darrick J. Wong

ocfs2: implement the VFS clone_range, copy_range, and dedupe_range features

Connect the new VFS clone_range, copy_range, and dedupe_range features
to the existing reflink capability of ocfs2.  Compared to the existing
ocfs2 reflink ioctl We have to do things a little differently to support
the VFS semantics (we can clone subranges of a file but we don't clone
xattrs), but the VFS ioctls are more broadly supported.
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
---
v2: Convert inline data files to extents files before reflinking,
and fix i_blocks so that stat(2) output is correct.
v3: Make zero-length dedupe consistent with btrfs behavior.
v4: Use VFS double-inode lock routines and remove MAX_DEDUPE_LEN.
上级 86e59436
......@@ -1667,9 +1667,9 @@ static void ocfs2_calc_trunc_pos(struct inode *inode,
*done = ret;
}
static int ocfs2_remove_inode_range(struct inode *inode,
struct buffer_head *di_bh, u64 byte_start,
u64 byte_len)
int ocfs2_remove_inode_range(struct inode *inode,
struct buffer_head *di_bh, u64 byte_start,
u64 byte_len)
{
int ret = 0, flags = 0, done = 0, i;
u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
......@@ -2439,6 +2439,31 @@ static loff_t ocfs2_file_llseek(struct file *file, loff_t offset, int whence)
return offset;
}
static int ocfs2_file_clone_range(struct file *file_in,
loff_t pos_in,
struct file *file_out,
loff_t pos_out,
u64 len)
{
return ocfs2_reflink_remap_range(file_in, pos_in, file_out, pos_out,
len, false);
}
static ssize_t ocfs2_file_dedupe_range(struct file *src_file,
u64 loff,
u64 len,
struct file *dst_file,
u64 dst_loff)
{
int error;
error = ocfs2_reflink_remap_range(src_file, loff, dst_file, dst_loff,
len, true);
if (error)
return error;
return len;
}
const struct inode_operations ocfs2_file_iops = {
.setattr = ocfs2_setattr,
.getattr = ocfs2_getattr,
......@@ -2478,6 +2503,8 @@ const struct file_operations ocfs2_fops = {
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
.fallocate = ocfs2_fallocate,
.clone_file_range = ocfs2_file_clone_range,
.dedupe_file_range = ocfs2_file_dedupe_range,
};
const struct file_operations ocfs2_dops = {
......@@ -2523,6 +2550,8 @@ const struct file_operations ocfs2_fops_no_plocks = {
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
.fallocate = ocfs2_fallocate,
.clone_file_range = ocfs2_file_clone_range,
.dedupe_file_range = ocfs2_file_dedupe_range,
};
const struct file_operations ocfs2_dops_no_plocks = {
......
......@@ -82,4 +82,7 @@ int ocfs2_change_file_space(struct file *file, unsigned int cmd,
int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
size_t count);
int ocfs2_remove_inode_range(struct inode *inode,
struct buffer_head *di_bh, u64 byte_start,
u64 byte_len);
#endif /* OCFS2_FILE_H */
......@@ -34,6 +34,7 @@
#include "xattr.h"
#include "namei.h"
#include "ocfs2_trace.h"
#include "file.h"
#include <linux/bio.h>
#include <linux/blkdev.h>
......@@ -4448,3 +4449,434 @@ int ocfs2_reflink_ioctl(struct inode *inode,
return error;
}
/* Update destination inode size, if necessary. */
static int ocfs2_reflink_update_dest(struct inode *dest,
struct buffer_head *d_bh,
loff_t newlen)
{
handle_t *handle;
int ret;
dest->i_blocks = ocfs2_inode_sector_count(dest);
if (newlen <= i_size_read(dest))
return 0;
handle = ocfs2_start_trans(OCFS2_SB(dest->i_sb),
OCFS2_INODE_UPDATE_CREDITS);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
return ret;
}
/* Extend i_size if needed. */
spin_lock(&OCFS2_I(dest)->ip_lock);
if (newlen > i_size_read(dest))
i_size_write(dest, newlen);
spin_unlock(&OCFS2_I(dest)->ip_lock);
dest->i_ctime = dest->i_mtime = current_time(dest);
ret = ocfs2_mark_inode_dirty(handle, dest, d_bh);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
out_commit:
ocfs2_commit_trans(OCFS2_SB(dest->i_sb), handle);
return ret;
}
/* Remap the range pos_in:len in s_inode to pos_out:len in t_inode. */
static int ocfs2_reflink_remap_extent(struct inode *s_inode,
struct buffer_head *s_bh,
loff_t pos_in,
struct inode *t_inode,
struct buffer_head *t_bh,
loff_t pos_out,
loff_t len,
struct ocfs2_cached_dealloc_ctxt *dealloc)
{
struct ocfs2_extent_tree s_et;
struct ocfs2_extent_tree t_et;
struct ocfs2_dinode *dis;
struct buffer_head *ref_root_bh = NULL;
struct ocfs2_refcount_tree *ref_tree;
struct ocfs2_super *osb;
loff_t pstart, plen;
u32 p_cluster, num_clusters, slast, spos, tpos;
unsigned int ext_flags;
int ret = 0;
osb = OCFS2_SB(s_inode->i_sb);
dis = (struct ocfs2_dinode *)s_bh->b_data;
ocfs2_init_dinode_extent_tree(&s_et, INODE_CACHE(s_inode), s_bh);
ocfs2_init_dinode_extent_tree(&t_et, INODE_CACHE(t_inode), t_bh);
spos = ocfs2_bytes_to_clusters(s_inode->i_sb, pos_in);
tpos = ocfs2_bytes_to_clusters(t_inode->i_sb, pos_out);
slast = ocfs2_clusters_for_bytes(s_inode->i_sb, pos_in + len);
while (spos < slast) {
if (fatal_signal_pending(current)) {
ret = -EINTR;
goto out;
}
/* Look up the extent. */
ret = ocfs2_get_clusters(s_inode, spos, &p_cluster,
&num_clusters, &ext_flags);
if (ret) {
mlog_errno(ret);
goto out;
}
num_clusters = min_t(u32, num_clusters, slast - spos);
/* Punch out the dest range. */
pstart = ocfs2_clusters_to_bytes(t_inode->i_sb, tpos);
plen = ocfs2_clusters_to_bytes(t_inode->i_sb, num_clusters);
ret = ocfs2_remove_inode_range(t_inode, t_bh, pstart, plen);
if (ret) {
mlog_errno(ret);
goto out;
}
if (p_cluster == 0)
goto next_loop;
/* Lock the refcount btree... */
ret = ocfs2_lock_refcount_tree(osb,
le64_to_cpu(dis->i_refcount_loc),
1, &ref_tree, &ref_root_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
/* Mark s_inode's extent as refcounted. */
if (!(ext_flags & OCFS2_EXT_REFCOUNTED)) {
ret = ocfs2_add_refcount_flag(s_inode, &s_et,
&ref_tree->rf_ci,
ref_root_bh, spos,
p_cluster, num_clusters,
dealloc, NULL);
if (ret) {
mlog_errno(ret);
goto out_unlock_refcount;
}
}
/* Map in the new extent. */
ext_flags |= OCFS2_EXT_REFCOUNTED;
ret = ocfs2_add_refcounted_extent(t_inode, &t_et,
&ref_tree->rf_ci,
ref_root_bh,
tpos, p_cluster,
num_clusters,
ext_flags,
dealloc);
if (ret) {
mlog_errno(ret);
goto out_unlock_refcount;
}
ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
brelse(ref_root_bh);
next_loop:
spos += num_clusters;
tpos += num_clusters;
}
out:
return ret;
out_unlock_refcount:
ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
brelse(ref_root_bh);
return ret;
}
/* Set up refcount tree and remap s_inode to t_inode. */
static int ocfs2_reflink_remap_blocks(struct inode *s_inode,
struct buffer_head *s_bh,
loff_t pos_in,
struct inode *t_inode,
struct buffer_head *t_bh,
loff_t pos_out,
loff_t len)
{
struct ocfs2_cached_dealloc_ctxt dealloc;
struct ocfs2_super *osb;
struct ocfs2_dinode *dis;
struct ocfs2_dinode *dit;
int ret;
osb = OCFS2_SB(s_inode->i_sb);
dis = (struct ocfs2_dinode *)s_bh->b_data;
dit = (struct ocfs2_dinode *)t_bh->b_data;
ocfs2_init_dealloc_ctxt(&dealloc);
/*
* If we're reflinking the entire file and the source is inline
* data, just copy the contents.
*/
if (pos_in == pos_out && pos_in == 0 && len == i_size_read(s_inode) &&
i_size_read(t_inode) <= len &&
(OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) {
ret = ocfs2_duplicate_inline_data(s_inode, s_bh, t_inode, t_bh);
if (ret)
mlog_errno(ret);
goto out;
}
/*
* If both inodes belong to two different refcount groups then
* forget it because we don't know how (or want) to go merging
* refcount trees.
*/
ret = -EOPNOTSUPP;
if (ocfs2_is_refcount_inode(s_inode) &&
ocfs2_is_refcount_inode(t_inode) &&
le64_to_cpu(dis->i_refcount_loc) !=
le64_to_cpu(dit->i_refcount_loc))
goto out;
/* Neither inode has a refcount tree. Add one to s_inode. */
if (!ocfs2_is_refcount_inode(s_inode) &&
!ocfs2_is_refcount_inode(t_inode)) {
ret = ocfs2_create_refcount_tree(s_inode, s_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
}
/* Ensure that both inodes end up with the same refcount tree. */
if (!ocfs2_is_refcount_inode(s_inode)) {
ret = ocfs2_set_refcount_tree(s_inode, s_bh,
le64_to_cpu(dit->i_refcount_loc));
if (ret) {
mlog_errno(ret);
goto out;
}
}
if (!ocfs2_is_refcount_inode(t_inode)) {
ret = ocfs2_set_refcount_tree(t_inode, t_bh,
le64_to_cpu(dis->i_refcount_loc));
if (ret) {
mlog_errno(ret);
goto out;
}
}
/* Turn off inline data in the dest file. */
if (OCFS2_I(t_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
ret = ocfs2_convert_inline_data_to_extents(t_inode, t_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
}
/* Actually remap extents now. */
ret = ocfs2_reflink_remap_extent(s_inode, s_bh, pos_in, t_inode, t_bh,
pos_out, len, &dealloc);
if (ret) {
mlog_errno(ret);
goto out;
}
out:
if (ocfs2_dealloc_has_cluster(&dealloc)) {
ocfs2_schedule_truncate_log_flush(osb, 1);
ocfs2_run_deallocs(osb, &dealloc);
}
return ret;
}
/* Lock an inode and grab a bh pointing to the inode. */
static int ocfs2_reflink_inodes_lock(struct inode *s_inode,
struct buffer_head **bh1,
struct inode *t_inode,
struct buffer_head **bh2)
{
struct inode *inode1;
struct inode *inode2;
struct ocfs2_inode_info *oi1;
struct ocfs2_inode_info *oi2;
bool same_inode = (s_inode == t_inode);
int status;
/* First grab the VFS and rw locks. */
lock_two_nondirectories(s_inode, t_inode);
inode1 = s_inode;
inode2 = t_inode;
if (inode1->i_ino > inode2->i_ino)
swap(inode1, inode2);
status = ocfs2_rw_lock(inode1, 1);
if (status) {
mlog_errno(status);
goto out_i1;
}
if (!same_inode) {
status = ocfs2_rw_lock(inode2, 1);
if (status) {
mlog_errno(status);
goto out_i2;
}
}
/* Now go for the cluster locks */
oi1 = OCFS2_I(inode1);
oi2 = OCFS2_I(inode2);
trace_ocfs2_double_lock((unsigned long long)oi1->ip_blkno,
(unsigned long long)oi2->ip_blkno);
if (*bh1)
*bh1 = NULL;
if (*bh2)
*bh2 = NULL;
/* We always want to lock the one with the lower lockid first. */
if (oi1->ip_blkno > oi2->ip_blkno)
mlog_errno(-ENOLCK);
/* lock id1 */
status = ocfs2_inode_lock_nested(inode1, bh1, 1, OI_LS_REFLINK_TARGET);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
goto out_rw2;
}
/* lock id2 */
if (!same_inode) {
status = ocfs2_inode_lock_nested(inode2, bh2, 1,
OI_LS_REFLINK_TARGET);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
goto out_cl1;
}
} else
*bh2 = *bh1;
trace_ocfs2_double_lock_end(
(unsigned long long)OCFS2_I(inode1)->ip_blkno,
(unsigned long long)OCFS2_I(inode2)->ip_blkno);
return 0;
out_cl1:
ocfs2_inode_unlock(inode1, 1);
brelse(*bh1);
*bh1 = NULL;
out_rw2:
ocfs2_rw_unlock(inode2, 1);
out_i2:
ocfs2_rw_unlock(inode1, 1);
out_i1:
unlock_two_nondirectories(s_inode, t_inode);
return status;
}
/* Unlock both inodes and release buffers. */
static void ocfs2_reflink_inodes_unlock(struct inode *s_inode,
struct buffer_head *s_bh,
struct inode *t_inode,
struct buffer_head *t_bh)
{
ocfs2_inode_unlock(s_inode, 1);
ocfs2_rw_unlock(s_inode, 1);
brelse(s_bh);
if (s_inode != t_inode) {
ocfs2_inode_unlock(t_inode, 1);
ocfs2_rw_unlock(t_inode, 1);
brelse(t_bh);
}
unlock_two_nondirectories(s_inode, t_inode);
}
/* Link a range of blocks from one file to another. */
int ocfs2_reflink_remap_range(struct file *file_in,
loff_t pos_in,
struct file *file_out,
loff_t pos_out,
u64 len,
bool is_dedupe)
{
struct inode *inode_in = file_inode(file_in);
struct inode *inode_out = file_inode(file_out);
struct ocfs2_super *osb = OCFS2_SB(inode_in->i_sb);
struct buffer_head *in_bh = NULL, *out_bh = NULL;
bool same_inode = (inode_in == inode_out);
ssize_t ret;
if (!ocfs2_refcount_tree(osb))
return -EOPNOTSUPP;
if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
return -EROFS;
/* Lock both files against IO */
ret = ocfs2_reflink_inodes_lock(inode_in, &in_bh, inode_out, &out_bh);
if (ret)
return ret;
/* Check file eligibility and prepare for block sharing. */
ret = -EINVAL;
if ((OCFS2_I(inode_in)->ip_flags & OCFS2_INODE_SYSTEM_FILE) ||
(OCFS2_I(inode_out)->ip_flags & OCFS2_INODE_SYSTEM_FILE))
goto out_unlock;
ret = vfs_clone_file_prep_inodes(inode_in, pos_in, inode_out, pos_out,
&len, is_dedupe);
if (ret || len == 0)
goto out_unlock;
/* Lock out changes to the allocation maps and remap. */
down_write(&OCFS2_I(inode_in)->ip_alloc_sem);
if (!same_inode)
down_write_nested(&OCFS2_I(inode_out)->ip_alloc_sem,
SINGLE_DEPTH_NESTING);
ret = ocfs2_reflink_remap_blocks(inode_in, in_bh, pos_in, inode_out,
out_bh, pos_out, len);
/* Zap any page cache for the destination file's range. */
if (!ret)
truncate_inode_pages_range(&inode_out->i_data, pos_out,
PAGE_ALIGN(pos_out + len) - 1);
up_write(&OCFS2_I(inode_in)->ip_alloc_sem);
if (!same_inode)
up_write(&OCFS2_I(inode_out)->ip_alloc_sem);
if (ret) {
mlog_errno(ret);
goto out_unlock;
}
/*
* Empty the extent map so that we may get the right extent
* record from the disk.
*/
ocfs2_extent_map_trunc(inode_in, 0);
ocfs2_extent_map_trunc(inode_out, 0);
ret = ocfs2_reflink_update_dest(inode_out, out_bh, pos_out + len);
if (ret) {
mlog_errno(ret);
goto out_unlock;
}
ocfs2_reflink_inodes_unlock(inode_in, in_bh, inode_out, out_bh);
return 0;
out_unlock:
ocfs2_reflink_inodes_unlock(inode_in, in_bh, inode_out, out_bh);
return ret;
}
......@@ -115,4 +115,11 @@ int ocfs2_reflink_ioctl(struct inode *inode,
const char __user *oldname,
const char __user *newname,
bool preserve);
int ocfs2_reflink_remap_range(struct file *file_in,
loff_t pos_in,
struct file *file_out,
loff_t pos_out,
u64 len,
bool is_dedupe);
#endif /* OCFS2_REFCOUNTTREE_H */
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