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Diffstat (limited to 'fs/gfs2/rgrp.c')
-rw-r--r--fs/gfs2/rgrp.c81
1 files changed, 48 insertions, 33 deletions
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 503b842f3ba2..171a744f8e45 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -854,7 +854,8 @@ static void gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
if ((start + nr_sects) != blk) {
rv = blkdev_issue_discard(bdev, start,
nr_sects, GFP_NOFS,
- DISCARD_FL_BARRIER);
+ BLKDEV_IFL_WAIT |
+ BLKDEV_IFL_BARRIER);
if (rv)
goto fail;
nr_sects = 0;
@@ -869,7 +870,7 @@ start_new_extent:
}
if (nr_sects) {
rv = blkdev_issue_discard(bdev, start, nr_sects, GFP_NOFS,
- DISCARD_FL_BARRIER);
+ BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER);
if (rv)
goto fail;
}
@@ -948,13 +949,13 @@ static int try_rgrp_fit(struct gfs2_rgrpd *rgd, struct gfs2_alloc *al)
* try_rgrp_unlink - Look for any unlinked, allocated, but unused inodes
* @rgd: The rgrp
*
- * Returns: The inode, if one has been found
+ * Returns: 0 if no error
+ * The inode, if one has been found, in inode.
*/
-static struct inode *try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked,
- u64 skip)
+static u64 try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked,
+ u64 skip)
{
- struct inode *inode;
u32 goal = 0, block;
u64 no_addr;
struct gfs2_sbd *sdp = rgd->rd_sbd;
@@ -979,14 +980,11 @@ static struct inode *try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked,
if (no_addr == skip)
continue;
*last_unlinked = no_addr;
- inode = gfs2_inode_lookup(rgd->rd_sbd->sd_vfs, DT_UNKNOWN,
- no_addr, -1, 1);
- if (!IS_ERR(inode))
- return inode;
+ return no_addr;
}
rgd->rd_flags &= ~GFS2_RDF_CHECK;
- return NULL;
+ return 0;
}
/**
@@ -1067,11 +1065,12 @@ static void forward_rgrp_set(struct gfs2_sbd *sdp, struct gfs2_rgrpd *rgd)
* Try to acquire rgrp in way which avoids contending with others.
*
* Returns: errno
+ * unlinked: the block address of an unlinked block to be reclaimed
*/
-static struct inode *get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
+static int get_local_rgrp(struct gfs2_inode *ip, u64 *unlinked,
+ u64 *last_unlinked)
{
- struct inode *inode = NULL;
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct gfs2_rgrpd *rgd, *begin = NULL;
struct gfs2_alloc *al = ip->i_alloc;
@@ -1080,6 +1079,7 @@ static struct inode *get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
int loops = 0;
int error, rg_locked;
+ *unlinked = 0;
rgd = gfs2_blk2rgrpd(sdp, ip->i_goal);
while (rgd) {
@@ -1096,19 +1096,24 @@ static struct inode *get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
case 0:
if (try_rgrp_fit(rgd, al))
goto out;
- if (rgd->rd_flags & GFS2_RDF_CHECK)
- inode = try_rgrp_unlink(rgd, last_unlinked, ip->i_no_addr);
+ /* If the rg came in already locked, there's no
+ way we can recover from a failed try_rgrp_unlink
+ because that would require an iput which can only
+ happen after the rgrp is unlocked. */
+ if (!rg_locked && rgd->rd_flags & GFS2_RDF_CHECK)
+ *unlinked = try_rgrp_unlink(rgd, last_unlinked,
+ ip->i_no_addr);
if (!rg_locked)
gfs2_glock_dq_uninit(&al->al_rgd_gh);
- if (inode)
- return inode;
+ if (*unlinked)
+ return -EAGAIN;
/* fall through */
case GLR_TRYFAILED:
rgd = recent_rgrp_next(rgd);
break;
default:
- return ERR_PTR(error);
+ return error;
}
}
@@ -1130,12 +1135,13 @@ static struct inode *get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
case 0:
if (try_rgrp_fit(rgd, al))
goto out;
- if (rgd->rd_flags & GFS2_RDF_CHECK)
- inode = try_rgrp_unlink(rgd, last_unlinked, ip->i_no_addr);
+ if (!rg_locked && rgd->rd_flags & GFS2_RDF_CHECK)
+ *unlinked = try_rgrp_unlink(rgd, last_unlinked,
+ ip->i_no_addr);
if (!rg_locked)
gfs2_glock_dq_uninit(&al->al_rgd_gh);
- if (inode)
- return inode;
+ if (*unlinked)
+ return -EAGAIN;
break;
case GLR_TRYFAILED:
@@ -1143,7 +1149,7 @@ static struct inode *get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
break;
default:
- return ERR_PTR(error);
+ return error;
}
rgd = gfs2_rgrpd_get_next(rgd);
@@ -1152,7 +1158,7 @@ static struct inode *get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
if (rgd == begin) {
if (++loops >= 3)
- return ERR_PTR(-ENOSPC);
+ return -ENOSPC;
if (!skipped)
loops++;
flags = 0;
@@ -1172,7 +1178,7 @@ out:
forward_rgrp_set(sdp, rgd);
}
- return NULL;
+ return 0;
}
/**
@@ -1186,9 +1192,8 @@ int gfs2_inplace_reserve_i(struct gfs2_inode *ip, char *file, unsigned int line)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct gfs2_alloc *al = ip->i_alloc;
- struct inode *inode;
int error = 0;
- u64 last_unlinked = NO_BLOCK;
+ u64 last_unlinked = NO_BLOCK, unlinked;
if (gfs2_assert_warn(sdp, al->al_requested))
return -EINVAL;
@@ -1204,17 +1209,27 @@ try_again:
if (error)
return error;
- inode = get_local_rgrp(ip, &last_unlinked);
- if (inode) {
+ /* Find an rgrp suitable for allocation. If it encounters any unlinked
+ dinodes along the way, error will equal -EAGAIN and unlinked will
+ contains it block address. We then need to look up that inode and
+ try to free it, and try the allocation again. */
+ error = get_local_rgrp(ip, &unlinked, &last_unlinked);
+ if (error) {
if (ip != GFS2_I(sdp->sd_rindex))
gfs2_glock_dq_uninit(&al->al_ri_gh);
- if (IS_ERR(inode))
- return PTR_ERR(inode);
- iput(inode);
+ if (error != -EAGAIN)
+ return error;
+
+ gfs2_process_unlinked_inode(ip->i_inode.i_sb, unlinked);
+ /* regardless of whether or not gfs2_process_unlinked_inode
+ was successful, we don't want to repeat it again. */
+ last_unlinked = unlinked;
gfs2_log_flush(sdp, NULL);
+ error = 0;
+
goto try_again;
}
-
+ /* no error, so we have the rgrp set in the inode's allocation. */
al->al_file = file;
al->al_line = line;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.