[GFS2] Kernel changes to support new gfs2_grow command (part 2)

To avoid code redundancy, I separated out the operational "guts" into
a new function called read_rindex_entry.  Then I made two functions:
the closer-to-original gfs2_ri_update (without the special condition
checks) and gfs2_ri_update_special that's designed with that condition
in mind.  (I don't like the name, but if you have a suggestion, I'm
all ears).

Oh, and there's an added benefit:  we don't need all the ugly gotos
anymore.  ;)

This patch has been tested with gfs2_fsck_hellfire (which runs for
three and a half hours, btw).

Signed-off-By: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 846c0ff75cff54b89a52a9776d3d765f27c3b39c..e0b4e8c2b68d012fd0583fd6fb44a6a9af137a7f 100644 (file)
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -469,7 +469,8 @@ static void adjust_fs_space(struct inode *inode)
        else
                new_free = 0;
        spin_unlock(&sdp->sd_statfs_spin);
-       fs_warn(sdp, "File system extended by %llu blocks.\n", new_free);
+       fs_warn(sdp, "File system extended by %llu blocks.\n",
+               (unsigned long long)new_free);
        gfs2_statfs_change(sdp, new_free, new_free, 0);
 }
 

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index e857f405353b7a8f655119cb38fcb2e6ae675a01..48a6461d601c3de8cc5aeb00a154344593d7a9a9 100644 (file)
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -463,9 +463,62 @@ u64 gfs2_ri_total(struct gfs2_sbd *sdp)
 }
 
 /**
- * gfs2_ri_update - Pull in a new resource index from the disk
+ * read_rindex_entry - Pull in a new resource index entry from the disk
  * @gl: The glock covering the rindex inode
  *
+ * Returns: 0 on success, error code otherwise
+ */
+
+static int read_rindex_entry(struct gfs2_inode *ip,
+                            struct file_ra_state *ra_state)
+{
+       struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+       loff_t pos = sdp->sd_rgrps * sizeof(struct gfs2_rindex);
+       char buf[sizeof(struct gfs2_rindex)];
+       int error;
+       struct gfs2_rgrpd *rgd;
+
+       error = gfs2_internal_read(ip, ra_state, buf, &pos,
+                                  sizeof(struct gfs2_rindex));
+       if (!error)
+               return 0;
+       if (error != sizeof(struct gfs2_rindex)) {
+               if (error > 0)
+                       error = -EIO;
+               return error;
+       }
+
+       rgd = kzalloc(sizeof(struct gfs2_rgrpd), GFP_NOFS);
+       error = -ENOMEM;
+       if (!rgd)
+               return error;
+
+       mutex_init(&rgd->rd_mutex);
+       lops_init_le(&rgd->rd_le, &gfs2_rg_lops);
+       rgd->rd_sbd = sdp;
+
+       list_add_tail(&rgd->rd_list, &sdp->sd_rindex_list);
+       list_add_tail(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);
+
+       gfs2_rindex_in(&rgd->rd_ri, buf);
+       error = compute_bitstructs(rgd);
+       if (error)
+               return error;
+
+       error = gfs2_glock_get(sdp, rgd->rd_ri.ri_addr,
+                              &gfs2_rgrp_glops, CREATE, &rgd->rd_gl);
+       if (error)
+               return error;
+
+       rgd->rd_gl->gl_object = rgd;
+       rgd->rd_rg_vn = rgd->rd_gl->gl_vn - 1;
+       return error;
+}
+
+/**
+ * gfs2_ri_update - Pull in a new resource index from the disk
+ * @ip: pointer to the rindex inode
+ *
  * Returns: 0 on successful update, error code otherwise
  */
 
@@ -473,18 +526,11 @@ static int gfs2_ri_update(struct gfs2_inode *ip)
 {
        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
        struct inode *inode = &ip->i_inode;
-       struct gfs2_rgrpd *rgd;
-       char buf[sizeof(struct gfs2_rindex)];
        struct file_ra_state ra_state;
        u64 junk = ip->i_di.di_size;
        int error;
 
-       /* If someone is holding the rindex file with a glock, they must
-          be updating it, in which case we may have partial entries.
-          In this case, we ignore the partials. */
-       if (!gfs2_glock_is_held_excl(ip->i_gl) &&
-           !gfs2_glock_is_held_shrd(ip->i_gl) &&
-           do_div(junk, sizeof(struct gfs2_rindex))) {
+       if (do_div(junk, sizeof(struct gfs2_rindex))) {
                gfs2_consist_inode(ip);
                return -EIO;
        }
@@ -493,52 +539,49 @@ static int gfs2_ri_update(struct gfs2_inode *ip)
 
        file_ra_state_init(&ra_state, inode->i_mapping);
        for (sdp->sd_rgrps = 0;; sdp->sd_rgrps++) {
-               loff_t pos = sdp->sd_rgrps * sizeof(struct gfs2_rindex);
-
-               if (pos + sizeof(struct gfs2_rindex) >= ip->i_di.di_size)
-                       break;
-               error = gfs2_internal_read(ip, &ra_state, buf, &pos,
-                                           sizeof(struct gfs2_rindex));
-               if (!error)
-                       break;
-               if (error != sizeof(struct gfs2_rindex)) {
-                       if (error > 0)
-                               error = -EIO;
-                       goto fail;
+               error = read_rindex_entry(ip, &ra_state);
+               if (error) {
+                       clear_rgrpdi(sdp);
+                       return error;
                }
+       }
 
-               rgd = kzalloc(sizeof(struct gfs2_rgrpd), GFP_NOFS);
-               error = -ENOMEM;
-               if (!rgd)
-                       goto fail;
-
-               mutex_init(&rgd->rd_mutex);
-               lops_init_le(&rgd->rd_le, &gfs2_rg_lops);
-               rgd->rd_sbd = sdp;
-
-               list_add_tail(&rgd->rd_list, &sdp->sd_rindex_list);
-               list_add_tail(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);
-
-               gfs2_rindex_in(&rgd->rd_ri, buf);
-               error = compute_bitstructs(rgd);
-               if (error)
-                       goto fail;
+       sdp->sd_rindex_vn = ip->i_gl->gl_vn;
+       return 0;
+}
 
-               error = gfs2_glock_get(sdp, rgd->rd_ri.ri_addr,
-                                      &gfs2_rgrp_glops, CREATE, &rgd->rd_gl);
-               if (error)
-                       goto fail;
+/**
+ * gfs2_ri_update_special - Pull in a new resource index from the disk
+ *
+ * This is a special version that's safe to call from gfs2_inplace_reserve_i.
+ * In this case we know that we don't have any resource groups in memory yet.
+ *
+ * @ip: pointer to the rindex inode
+ *
+ * Returns: 0 on successful update, error code otherwise
+ */
+static int gfs2_ri_update_special(struct gfs2_inode *ip)
+{
+       struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+       struct inode *inode = &ip->i_inode;
+       struct file_ra_state ra_state;
+       int error;
 
-               rgd->rd_gl->gl_object = rgd;
-               rgd->rd_rg_vn = rgd->rd_gl->gl_vn - 1;
+       file_ra_state_init(&ra_state, inode->i_mapping);
+       for (sdp->sd_rgrps = 0;; sdp->sd_rgrps++) {
+               /* Ignore partials */
+               if ((sdp->sd_rgrps + 1) * sizeof(struct gfs2_rindex) >
+                   ip->i_di.di_size)
+                       break;
+               error = read_rindex_entry(ip, &ra_state);
+               if (error) {
+                       clear_rgrpdi(sdp);
+                       return error;
+               }
        }
 
        sdp->sd_rindex_vn = ip->i_gl->gl_vn;
        return 0;
-
-fail:
-       clear_rgrpdi(sdp);
-       return error;
 }
 
 /**
@@ -1028,7 +1071,7 @@ int gfs2_inplace_reserve_i(struct gfs2_inode *ip, char *file, unsigned int line)
        if (ip != GFS2_I(sdp->sd_rindex))
                error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
        else if (!sdp->sd_rgrps) /* We may not have the rindex read in, so: */
-               error = gfs2_ri_update(ip);
+               error = gfs2_ri_update_special(ip);
 
        if (error)
                return error;