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-rw-r--r--fs/btrfs/ctree.h1
-rw-r--r--fs/btrfs/extent-tree.c50
-rw-r--r--fs/btrfs/free-space-cache.c92
-rw-r--r--fs/btrfs/free-space-cache.h2
-rw-r--r--fs/btrfs/ioctl.c46
5 files changed, 190 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index a18b7bc2b22c..93a0191aded6 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2232,6 +2232,7 @@ int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr,
u64 num_bytes, u64 *actual_bytes);
int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 type);
+int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range);
/* ctree.c */
int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index e990d2d1ba4a..1efeda3b2f6f 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -440,7 +440,7 @@ static int cache_block_group(struct btrfs_block_group_cache *cache,
* allocate blocks for the tree root we can't do the fast caching since
* we likely hold important locks.
*/
- if (!trans->transaction->in_commit &&
+ if (trans && (!trans->transaction->in_commit) &&
(root && root != root->fs_info->tree_root)) {
spin_lock(&cache->lock);
if (cache->cached != BTRFS_CACHE_NO) {
@@ -8778,3 +8778,51 @@ int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr,
{
return btrfs_discard_extent(root, bytenr, num_bytes, actual_bytes);
}
+
+int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range)
+{
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_block_group_cache *cache = NULL;
+ u64 group_trimmed;
+ u64 start;
+ u64 end;
+ u64 trimmed = 0;
+ int ret = 0;
+
+ cache = btrfs_lookup_block_group(fs_info, range->start);
+
+ while (cache) {
+ if (cache->key.objectid >= (range->start + range->len)) {
+ btrfs_put_block_group(cache);
+ break;
+ }
+
+ start = max(range->start, cache->key.objectid);
+ end = min(range->start + range->len,
+ cache->key.objectid + cache->key.offset);
+
+ if (end - start >= range->minlen) {
+ if (!block_group_cache_done(cache)) {
+ ret = cache_block_group(cache, NULL, root, 0);
+ if (!ret)
+ wait_block_group_cache_done(cache);
+ }
+ ret = btrfs_trim_block_group(cache,
+ &group_trimmed,
+ start,
+ end,
+ range->minlen);
+
+ trimmed += group_trimmed;
+ if (ret) {
+ btrfs_put_block_group(cache);
+ break;
+ }
+ }
+
+ cache = next_block_group(fs_info->tree_root, cache);
+ }
+
+ range->len = trimmed;
+ return ret;
+}
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index f03ef97c3b21..0037427d8a9d 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -2178,3 +2178,95 @@ void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster)
cluster->block_group = NULL;
}
+int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
+ u64 *trimmed, u64 start, u64 end, u64 minlen)
+{
+ struct btrfs_free_space *entry = NULL;
+ struct btrfs_fs_info *fs_info = block_group->fs_info;
+ u64 bytes = 0;
+ u64 actually_trimmed;
+ int ret = 0;
+
+ *trimmed = 0;
+
+ while (start < end) {
+ spin_lock(&block_group->tree_lock);
+
+ if (block_group->free_space < minlen) {
+ spin_unlock(&block_group->tree_lock);
+ break;
+ }
+
+ entry = tree_search_offset(block_group, start, 0, 1);
+ if (!entry)
+ entry = tree_search_offset(block_group,
+ offset_to_bitmap(block_group,
+ start),
+ 1, 1);
+
+ if (!entry || entry->offset >= end) {
+ spin_unlock(&block_group->tree_lock);
+ break;
+ }
+
+ if (entry->bitmap) {
+ ret = search_bitmap(block_group, entry, &start, &bytes);
+ if (!ret) {
+ if (start >= end) {
+ spin_unlock(&block_group->tree_lock);
+ break;
+ }
+ bytes = min(bytes, end - start);
+ bitmap_clear_bits(block_group, entry,
+ start, bytes);
+ if (entry->bytes == 0)
+ free_bitmap(block_group, entry);
+ } else {
+ start = entry->offset + BITS_PER_BITMAP *
+ block_group->sectorsize;
+ spin_unlock(&block_group->tree_lock);
+ ret = 0;
+ continue;
+ }
+ } else {
+ start = entry->offset;
+ bytes = min(entry->bytes, end - start);
+ unlink_free_space(block_group, entry);
+ kfree(entry);
+ }
+
+ spin_unlock(&block_group->tree_lock);
+
+ if (bytes >= minlen) {
+ int update_ret;
+ update_ret = btrfs_update_reserved_bytes(block_group,
+ bytes, 1, 1);
+
+ ret = btrfs_error_discard_extent(fs_info->extent_root,
+ start,
+ bytes,
+ &actually_trimmed);
+
+ btrfs_add_free_space(block_group,
+ start, bytes);
+ if (!update_ret)
+ btrfs_update_reserved_bytes(block_group,
+ bytes, 0, 1);
+
+ if (ret)
+ break;
+ *trimmed += actually_trimmed;
+ }
+ start += bytes;
+ bytes = 0;
+
+ if (fatal_signal_pending(current)) {
+ ret = -ERESTARTSYS;
+ break;
+ }
+
+ cond_resched();
+ }
+
+ return ret;
+}
diff --git a/fs/btrfs/free-space-cache.h b/fs/btrfs/free-space-cache.h
index e49ca5c321b5..65c3b935289f 100644
--- a/fs/btrfs/free-space-cache.h
+++ b/fs/btrfs/free-space-cache.h
@@ -68,4 +68,6 @@ u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
int btrfs_return_cluster_to_free_space(
struct btrfs_block_group_cache *block_group,
struct btrfs_free_cluster *cluster);
+int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
+ u64 *trimmed, u64 start, u64 end, u64 minlen);
#endif
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 32c980ae0f1c..649f47d2afb4 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -40,6 +40,7 @@
#include <linux/xattr.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
+#include <linux/blkdev.h>
#include "compat.h"
#include "ctree.h"
#include "disk-io.h"
@@ -258,6 +259,49 @@ static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
return put_user(inode->i_generation, arg);
}
+static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
+{
+ struct btrfs_root *root = fdentry(file)->d_sb->s_fs_info;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_device *device;
+ struct request_queue *q;
+ struct fstrim_range range;
+ u64 minlen = ULLONG_MAX;
+ u64 num_devices = 0;
+ int ret;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ mutex_lock(&fs_info->fs_devices->device_list_mutex);
+ list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) {
+ if (!device->bdev)
+ continue;
+ q = bdev_get_queue(device->bdev);
+ if (blk_queue_discard(q)) {
+ num_devices++;
+ minlen = min((u64)q->limits.discard_granularity,
+ minlen);
+ }
+ }
+ mutex_unlock(&fs_info->fs_devices->device_list_mutex);
+ if (!num_devices)
+ return -EOPNOTSUPP;
+
+ if (copy_from_user(&range, arg, sizeof(range)))
+ return -EFAULT;
+
+ range.minlen = max(range.minlen, minlen);
+ ret = btrfs_trim_fs(root, &range);
+ if (ret < 0)
+ return ret;
+
+ if (copy_to_user(arg, &range, sizeof(range)))
+ return -EFAULT;
+
+ return 0;
+}
+
static noinline int create_subvol(struct btrfs_root *root,
struct dentry *dentry,
char *name, int namelen,
@@ -2426,6 +2470,8 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_setflags(file, argp);
case FS_IOC_GETVERSION:
return btrfs_ioctl_getversion(file, argp);
+ case FITRIM:
+ return btrfs_ioctl_fitrim(file, argp);
case BTRFS_IOC_SNAP_CREATE:
return btrfs_ioctl_snap_create(file, argp, 0);
case BTRFS_IOC_SNAP_CREATE_V2:
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-17 10:11:51 +0000