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Truncated SSD trimming zones to granularity supported by the device

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When the trimming granularity is greater than the cluster size, the
free zones have to be truncated to match the granularity.
This commit is contained in:
Jean-Pierre André 2019-01-23 17:43:47 +01:00
parent 1ae6d818f0
commit b9ad82ced7
1 changed files with 46 additions and 17 deletions
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63
libntfs-3g/ioctl.c
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@ -3,7 +3,7 @@
*
* This module is part of ntfs-3g library
*
* Copyright (c) 2014-2015 Jean-Pierre Andre
* Copyright (c) 2014-2019 Jean-Pierre Andre
* Copyright (c) 2014 Red Hat, Inc.
*
* This program/include file is free software; you can redistribute it and/or
@ -225,6 +225,24 @@ not_found:
return 0;
}
static inline LCN align_up(ntfs_volume *vol, LCN lcn, u64 granularity)
{
u64 aligned;
aligned = (lcn << vol->cluster_size_bits) + granularity - 1;
aligned -= aligned % granularity;
return (aligned >> vol->cluster_size_bits);
}
static inline u64 align_down(ntfs_volume *vol, u64 count, u64 granularity)
{
u64 aligned;
aligned = count << vol->cluster_size_bits;
aligned -= aligned % granularity;
return (aligned >> vol->cluster_size_bits);
}
#define FSTRIM_BUFSIZ 4096
/* Trim the filesystem.
@ -255,11 +273,11 @@ static int fstrim(ntfs_volume *vol, void *data, u64 *trimmed)
* XXX We could fix these limitations in future.
*/
if (start != 0 || len != (uint64_t)-1) {
ntfs_log_debug("fstrim: setting start or length is not supported\n");
ntfs_log_error("fstrim: setting start or length is not supported\n");
return -EINVAL;
}
if (minlen > vol->cluster_size) {
ntfs_log_debug("fstrim: minlen > cluster size is not supported\n");
ntfs_log_error("fstrim: minlen > cluster size is not supported\n");
return -EINVAL;
}
@ -269,7 +287,7 @@ static int fstrim(ntfs_volume *vol, void *data, u64 *trimmed)
* different.
*/
if (!NDevBlock(vol->dev)) {
ntfs_log_debug("fstrim: not supported for non-block-device\n");
ntfs_log_error("fstrim: not supported for non-block-device\n");
return -EOPNOTSUPP;
}
@ -278,15 +296,12 @@ static int fstrim(ntfs_volume *vol, void *data, u64 *trimmed)
if (ret)
return ret;
if (discard_alignment != 0) {
ntfs_log_debug("fstrim: backing device is not aligned for discards\n");
return -EOPNOTSUPP;
}
if (discard_granularity > vol->cluster_size) {
ntfs_log_debug("fstrim: discard granularity of backing device is larger than cluster size\n");
ntfs_log_error("fstrim: backing device is not aligned for discards\n");
return -EOPNOTSUPP;
}
if (discard_max_bytes == 0) {
ntfs_log_debug("fstrim: backing device does not support discard (discard_max_bytes == 0)\n");
ntfs_log_error("fstrim: backing device does not support discard (discard_max_bytes == 0)\n");
return -EOPNOTSUPP;
}
@ -323,11 +338,14 @@ static int fstrim(ntfs_volume *vol, void *data, u64 *trimmed)
}
/* Trim the clusters in large as possible blocks, but
* not larger than discard_max_bytes.
* not larger than discard_max_bytes, and compatible
* with the supported trim granularity.
*/
for (start_lcn = start_buf; start_lcn < end_buf; ++start_lcn) {
if (!ntfs_bit_get(buf, start_lcn-start_buf)) {
LCN end_lcn;
LCN aligned_lcn;
u64 aligned_count;
/* Cluster 'start_lcn' is not in use,
* find end of this run.
@ -338,14 +356,25 @@ static int fstrim(ntfs_volume *vol, void *data, u64 *trimmed)
< discard_max_bytes &&
!ntfs_bit_get(buf, end_lcn-start_buf))
end_lcn++;
aligned_lcn = align_up(vol, start_lcn,
discard_granularity);
if (aligned_lcn >= end_lcn)
aligned_count = 0;
else {
aligned_count =
align_down(vol,
end_lcn - aligned_lcn,
discard_granularity);
}
if (aligned_count) {
ret = fstrim_clusters(vol,
aligned_lcn, aligned_count);
if (ret)
goto free_out;
ret = fstrim_clusters(vol,
start_lcn, end_lcn-start_lcn);
if (ret)
goto free_out;
*trimmed += (end_lcn - start_lcn)
*trimmed += aligned_count
<< vol->cluster_size_bits;
}
start_lcn = end_lcn-1;
}
}