* Returns: The resource group, or NULL if not found
*/
-struct gfs2_rgrpd *gfs2_blk2rgrpd(struct gfs2_sbd *sdp, u64 blk)
+struct gfs2_rgrpd *gfs2_blk2rgrpd(struct gfs2_sbd *sdp, u64 blk, bool exact)
{
- struct rb_node **newn;
+ struct rb_node *n, *next;
struct gfs2_rgrpd *cur;
spin_lock(&sdp->sd_rindex_spin);
- newn = &sdp->sd_rindex_tree.rb_node;
- while (*newn) {
- cur = rb_entry(*newn, struct gfs2_rgrpd, rd_node);
+ n = sdp->sd_rindex_tree.rb_node;
+ while (n) {
+ cur = rb_entry(n, struct gfs2_rgrpd, rd_node);
+ next = NULL;
if (blk < cur->rd_addr)
- newn = &((*newn)->rb_left);
+ next = n->rb_left;
else if (blk >= cur->rd_data0 + cur->rd_data)
- newn = &((*newn)->rb_right);
- else {
+ next = n->rb_right;
+ if (next == NULL) {
spin_unlock(&sdp->sd_rindex_spin);
+ if (exact) {
+ if (blk < cur->rd_addr)
+ return NULL;
+ if (blk >= cur->rd_data0 + cur->rd_data)
+ return NULL;
+ }
return cur;
}
+ n = next;
}
spin_unlock(&sdp->sd_rindex_spin);
}
-void gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
+int gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
struct buffer_head *bh,
- const struct gfs2_bitmap *bi)
+ const struct gfs2_bitmap *bi, unsigned minlen, u64 *ptrimmed)
{
struct super_block *sb = sdp->sd_vfs;
struct block_device *bdev = sb->s_bdev;
sector_t nr_sects = 0;
int rv;
unsigned int x;
+ u32 trimmed = 0;
+ u8 diff;
for (x = 0; x < bi->bi_len; x++) {
- const u8 *orig = bh->b_data + bi->bi_offset + x;
- const u8 *clone = bi->bi_clone + bi->bi_offset + x;
- u8 diff = ~(*orig | (*orig >> 1)) & (*clone | (*clone >> 1));
+ const u8 *clone = bi->bi_clone ? bi->bi_clone : bi->bi_bh->b_data;
+ clone += bi->bi_offset;
+ clone += x;
+ if (bh) {
+ const u8 *orig = bh->b_data + bi->bi_offset + x;
+ diff = ~(*orig | (*orig >> 1)) & (*clone | (*clone >> 1));
+ } else {
+ diff = ~(*clone | (*clone >> 1));
+ }
diff &= 0x55;
if (diff == 0)
continue;
if (nr_sects == 0)
goto start_new_extent;
if ((start + nr_sects) != blk) {
- rv = blkdev_issue_discard(bdev, start,
- nr_sects, GFP_NOFS,
- 0);
- if (rv)
- goto fail;
+ if (nr_sects >= minlen) {
+ rv = blkdev_issue_discard(bdev,
+ start, nr_sects,
+ GFP_NOFS, 0);
+ if (rv)
+ goto fail;
+ trimmed += nr_sects;
+ }
nr_sects = 0;
start_new_extent:
start = blk;
blk += sects_per_blk;
}
}
- if (nr_sects) {
+ if (nr_sects >= minlen) {
rv = blkdev_issue_discard(bdev, start, nr_sects, GFP_NOFS, 0);
if (rv)
goto fail;
+ trimmed += nr_sects;
}
- return;
+ if (ptrimmed)
+ *ptrimmed = trimmed;
+ return 0;
+
fail:
- fs_warn(sdp, "error %d on discard request, turning discards off for this filesystem", rv);
+ if (sdp->sd_args.ar_discard)
+ fs_warn(sdp, "error %d on discard request, turning discards off for this filesystem", rv);
sdp->sd_args.ar_discard = 0;
+ return -EIO;
+}
+
+/**
+ * gfs2_fitrim - Generate discard requests for unused bits of the filesystem
+ * @filp: Any file on the filesystem
+ * @argp: Pointer to the arguments (also used to pass result)
+ *
+ * Returns: 0 on success, otherwise error code
+ */
+
+int gfs2_fitrim(struct file *filp, void __user *argp)
+{
+ struct inode *inode = filp->f_dentry->d_inode;
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ struct request_queue *q = bdev_get_queue(sdp->sd_vfs->s_bdev);
+ struct buffer_head *bh;
+ struct gfs2_rgrpd *rgd;
+ struct gfs2_rgrpd *rgd_end;
+ struct gfs2_holder gh;
+ struct fstrim_range r;
+ int ret = 0;
+ u64 amt;
+ u64 trimmed = 0;
+ unsigned int x;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (!blk_queue_discard(q))
+ return -EOPNOTSUPP;
+
+ ret = gfs2_rindex_update(sdp);
+ if (ret)
+ return ret;
+
+ if (argp == NULL) {
+ r.start = 0;
+ r.len = ULLONG_MAX;
+ r.minlen = 0;
+ } else if (copy_from_user(&r, argp, sizeof(r)))
+ return -EFAULT;
+
+ rgd = gfs2_blk2rgrpd(sdp, r.start, 0);
+ rgd_end = gfs2_blk2rgrpd(sdp, r.start + r.len, 0);
+
+ while (1) {
+
+ ret = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
+ if (ret)
+ goto out;
+
+ if (!(rgd->rd_flags & GFS2_RGF_TRIMMED)) {
+ /* Trim each bitmap in the rgrp */
+ for (x = 0; x < rgd->rd_length; x++) {
+ struct gfs2_bitmap *bi = rgd->rd_bits + x;
+ ret = gfs2_rgrp_send_discards(sdp, rgd->rd_data0, NULL, bi, r.minlen, &amt);
+ if (ret) {
+ gfs2_glock_dq_uninit(&gh);
+ goto out;
+ }
+ trimmed += amt;
+ }
+
+ /* Mark rgrp as having been trimmed */
+ ret = gfs2_trans_begin(sdp, RES_RG_HDR, 0);
+ if (ret == 0) {
+ bh = rgd->rd_bits[0].bi_bh;
+ rgd->rd_flags |= GFS2_RGF_TRIMMED;
+ gfs2_trans_add_bh(rgd->rd_gl, bh, 1);
+ gfs2_rgrp_out(rgd, bh->b_data);
+ gfs2_trans_end(sdp);
+ }
+ }
+ gfs2_glock_dq_uninit(&gh);
+
+ if (rgd == rgd_end)
+ break;
+
+ rgd = gfs2_rgrpd_get_next(rgd);
+ }
+
+out:
+ r.len = trimmed << 9;
+ if (argp && copy_to_user(argp, &r, sizeof(r)))
+ return -EFAULT;
+
+ return ret;
}
/**
if (ip->i_rgd && rgrp_contains_block(ip->i_rgd, ip->i_goal))
rgd = begin = ip->i_rgd;
else
- rgd = begin = gfs2_blk2rgrpd(sdp, ip->i_goal);
+ rgd = begin = gfs2_blk2rgrpd(sdp, ip->i_goal, 1);
if (rgd == NULL)
return -EBADSLT;
u32 length, rgrp_blk, buf_blk;
unsigned int buf;
- rgd = gfs2_blk2rgrpd(sdp, bstart);
+ rgd = gfs2_blk2rgrpd(sdp, bstart, 1);
if (!rgd) {
if (gfs2_consist(sdp))
fs_err(sdp, "block = %llu\n", (unsigned long long)bstart);
return;
trace_gfs2_block_alloc(ip, bstart, blen, GFS2_BLKST_FREE);
rgd->rd_free += blen;
-
+ rgd->rd_flags &= ~GFS2_RGF_TRIMMED;
gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
return error;
error = -EINVAL;
- rgd = gfs2_blk2rgrpd(sdp, no_addr);
+ rgd = gfs2_blk2rgrpd(sdp, no_addr, 1);
if (!rgd)
goto fail;
if (ip->i_rgd && rgrp_contains_block(ip->i_rgd, block))
rgd = ip->i_rgd;
else
- rgd = gfs2_blk2rgrpd(sdp, block);
+ rgd = gfs2_blk2rgrpd(sdp, block, 1);
if (!rgd) {
fs_err(sdp, "rlist_add: no rgrp for block %llu\n", (unsigned long long)block);
return;
projects / ~andy / linux / commitdiff