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-   -   fsck.gfs2: fsck.gfs2: split check_leaf_blks to be more readable (http://www.linux-archive.org/cluster-development/623183-fsck-gfs2-fsck-gfs2-split-check_leaf_blks-more-readable.html)

01-20-2012 02:10 PM

fsck.gfs2: fsck.gfs2: split check_leaf_blks to be more readable
 
From: Bob Peterson <rpeterso@redhat.com>

This patch splits function check_leaf_blks into two functions to make it
more understandable. Before, it had way too many levels of indentation and
spanned multiple screens. This makes it a lot more clear.

rhbz#675723
---
gfs2/fsck/metawalk.c | 255 +++++++++++++++++++++++++++-----------------------
1 files changed, 138 insertions(+), 117 deletions(-)

diff --git a/gfs2/fsck/metawalk.c b/gfs2/fsck/metawalk.c
index cf75164..9252aec 100644
--- a/gfs2/fsck/metawalk.c
+++ b/gfs2/fsck/metawalk.c
@@ -436,10 +436,12 @@ static int check_entries(struct gfs2_inode *ip, struct gfs2_buffer_head *bh,
/* so that they replace the bad ones. We have to hack up the old */
/* leaf a bit, but it's better than deleting the whole directory, */
/* which is what used to happen before. */
-static void warn_and_patch(struct gfs2_inode *ip, uint64_t *leaf_no,
- uint64_t *bad_leaf, uint64_t old_leaf,
- uint64_t first_ok_leaf, int pindex, const char *msg)
+static int warn_and_patch(struct gfs2_inode *ip, uint64_t *leaf_no,
+ uint64_t *bad_leaf, uint64_t old_leaf,
+ uint64_t first_ok_leaf, int pindex, const char *msg)
{
+ int okay_to_fix = 0;
+
if (*bad_leaf != *leaf_no) {
log_err( _("Directory Inode %llu (0x%llx) points to leaf %llu"
" (0x%llx) %s.
"),
@@ -449,7 +451,7 @@ static void warn_and_patch(struct gfs2_inode *ip, uint64_t *leaf_no,
(unsigned long long)*leaf_no, msg);
}
if (*leaf_no == *bad_leaf ||
- query( _("Attempt to patch around it? (y/n) "))) {
+ (okay_to_fix = query( _("Attempt to patch around it? (y/n) ")))) {
if (!valid_block(ip->i_sbd, old_leaf) == 0)
gfs2_put_leaf_nr(ip, pindex, old_leaf);
else
@@ -462,6 +464,133 @@ static void warn_and_patch(struct gfs2_inode *ip, uint64_t *leaf_no,
log_err( _("Bad leaf left in place.
"));
*bad_leaf = *leaf_no;
*leaf_no = old_leaf;
+ return okay_to_fix;
+}
+
+/**
+ * check_leaf - check a leaf block for errors
+ */
+static int check_leaf(struct gfs2_inode *ip, int lindex,
+ struct metawalk_fxns *pass, int *ref_count,
+ uint64_t *leaf_no, uint64_t old_leaf, uint64_t *bad_leaf,
+ uint64_t first_ok_leaf, struct gfs2_leaf *leaf,
+ struct gfs2_leaf *oldleaf)
+{
+ int error = 0, fix;
+ struct gfs2_buffer_head *lbh = NULL;
+ uint32_t count = 0;
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ const char *msg;
+
+ *ref_count = 1;
+ /* Make sure the block number is in range. */
+ if (!valid_block(ip->i_sbd, *leaf_no)) {
+ log_err( _("Leaf block #%llu (0x%llx) is out of range for "
+ "directory #%llu (0x%llx).
"),
+ (unsigned long long)*leaf_no,
+ (unsigned long long)*leaf_no,
+ (unsigned long long)ip->i_di.di_num.no_addr,
+ (unsigned long long)ip->i_di.di_num.no_addr);
+ msg = _("that is out of range");
+ goto out_copy_old_leaf;
+ }
+
+ /* Try to read in the leaf block. */
+ lbh = bread(sdp, *leaf_no);
+ /* Make sure it's really a valid leaf block. */
+ if (gfs2_check_meta(lbh, GFS2_METATYPE_LF)) {
+ msg = _("that is not really a leaf");
+ goto out_copy_old_leaf;
+ }
+ if (pass->check_leaf) {
+ error = pass->check_leaf(ip, *leaf_no, pass->private);
+ if (error) {
+ log_info(_("Previous reference to leaf %lld (0x%llx) "
+ "has already checked it; skipping.
"),
+ (unsigned long long)*leaf_no,
+ (unsigned long long)*leaf_no);
+ brelse(lbh);
+ return error;
+ }
+ }
+ /* Early versions of GFS2 had an endianess bug in the kernel that set
+ lf_dirent_format to cpu_to_be16(GFS2_FORMAT_DE). This was fixed
+ to use cpu_to_be32(), but we should check for incorrect values and
+ replace them with the correct value. */
+
+ gfs2_leaf_in(leaf, lbh);
+ if (leaf->lf_dirent_format == (GFS2_FORMAT_DE << 16)) {
+ log_debug( _("incorrect lf_dirent_format at leaf #%" PRIu64
+ "
"), *leaf_no);
+ leaf->lf_dirent_format = GFS2_FORMAT_DE;
+ gfs2_leaf_out(leaf, lbh);
+ log_debug( _("Fixing lf_dirent_format.
"));
+ }
+
+ /* Make sure it's really a leaf. */
+ if (leaf->lf_header.mh_type != GFS2_METATYPE_LF) {
+ log_err( _("Inode %llu (0x%llx) points to bad leaf %llu"
+ " (0x%llx).
"),
+ (unsigned long long)ip->i_di.di_num.no_addr,
+ (unsigned long long)ip->i_di.di_num.no_addr,
+ (unsigned long long)*leaf_no,
+ (unsigned long long)*leaf_no);
+ msg = _("that is not a leaf");
+ goto out_copy_old_leaf;
+ }
+
+ if (pass->check_dentry && S_ISDIR(ip->i_di.di_mode)) {
+ error = check_entries(ip, lbh, DIR_EXHASH, &count, pass);
+
+ if (skip_this_pass || fsck_abort)
+ goto out;
+
+ if (error < 0) {
+ stack;
+ goto out;
+ }
+
+ if (count != leaf->lf_entries) {
+ /* release and re-read the leaf in case check_entries
+ changed it. */
+ brelse(lbh);
+ lbh = bread(sdp, *leaf_no);
+ gfs2_leaf_in(leaf, lbh);
+
+ log_err( _("Leaf %llu (0x%llx) entry count in "
+ "directory %llu (0x%llx) does not match "
+ "number of entries found - is %u, found %u
"),
+ (unsigned long long)*leaf_no,
+ (unsigned long long)*leaf_no,
+ (unsigned long long)ip->i_di.di_num.no_addr,
+ (unsigned long long)ip->i_di.di_num.no_addr,
+ leaf->lf_entries, count);
+ if (query( _("Update leaf entry count? (y/n) "))) {
+ leaf->lf_entries = count;
+ gfs2_leaf_out(leaf, lbh);
+ log_warn( _("Leaf entry count updated
"));
+ } else
+ log_err( _("Leaf entry count left in "
+ "inconsistant state
"));
+ }
+ }
+out:
+ brelse(lbh);
+ return 0;
+
+out_copy_old_leaf:
+ /* The leaf we read in is bad. So we'll copy the old leaf into the
+ * new one. However, that will make us shift our ref count. */
+ fix = warn_and_patch(ip, leaf_no, bad_leaf, old_leaf,
+ first_ok_leaf, lindex, msg);
+ (*ref_count)++;
+ memcpy(leaf, oldleaf, sizeof(struct gfs2_leaf));
+ if (lbh) {
+ if (fix)
+ bmodified(lbh);
+ brelse(lbh);
+ }
+ return 1;
}

/* Checks exhash directory entries */
@@ -474,8 +603,7 @@ static int check_leaf_blks(struct gfs2_inode *ip, struct metawalk_fxns *pass)
struct gfs2_buffer_head *lbh;
int lindex;
struct gfs2_sbd *sdp = ip->i_sbd;
- uint32_t count;
- int ref_count = 0, exp_count = 0;
+ int ref_count = 0;

/* Find the first valid leaf pointer in range and use it as our "old"
leaf. That way, bad blocks at the beginning will be overwritten
@@ -533,119 +661,12 @@ static int check_leaf_blks(struct gfs2_inode *ip, struct metawalk_fxns *pass)
if (error)
return error;
}
- ref_count = 1;
- count = 0;
- if (fsck_abort)
- break;
- /* Make sure the block number is in range. */
- if (!valid_block(ip->i_sbd, leaf_no)){
- log_err( _("Leaf block #%llu (0x%llx) is out "
- "of range for directory #%llu (0x%llx"
- ").
"), (unsigned long long)leaf_no,
- (unsigned long long)leaf_no,
- (unsigned long long)
- ip->i_di.di_num.no_addr,
- (unsigned long long)
- ip->i_di.di_num.no_addr);
- warn_and_patch(ip, &leaf_no, &bad_leaf,
- old_leaf, first_ok_leaf, lindex,
- _("that is out of range"));
- memcpy(&leaf, &oldleaf, sizeof(oldleaf));
- break;
- }
-
- /* Try to read in the leaf block. */
- lbh = bread(sdp, leaf_no);
- /* Make sure it's really a valid leaf block. */
- if (gfs2_check_meta(lbh, GFS2_METATYPE_LF)) {
- warn_and_patch(ip, &leaf_no, &bad_leaf,
- old_leaf, first_ok_leaf, lindex,
- _("that is not really a leaf"));
- memcpy(&leaf, &oldleaf, sizeof(oldleaf));
- bmodified(lbh);
- brelse(lbh);
- break;
- }
- gfs2_leaf_in(&leaf, lbh);
- if (pass->check_leaf)
- error = pass->check_leaf(ip, leaf_no,
- pass->private);
-
- /*
- * Early versions of GFS2 had an endianess bug in the
- * kernel that set lf_dirent_format to
- * cpu_to_be16(GFS2_FORMAT_DE). This was fixed to use
- * cpu_to_be32(), but we should check for incorrect
- * values and replace them with the correct value. */
-
- if (leaf.lf_dirent_format == (GFS2_FORMAT_DE << 16)) {
- log_debug( _("incorrect lf_dirent_format at leaf #%" PRIu64 "
"), leaf_no);
- leaf.lf_dirent_format = GFS2_FORMAT_DE;
- gfs2_leaf_out(&leaf, lbh);
- log_debug( _("Fixing lf_dirent_format.
"));
- }
-
- /* Make sure it's really a leaf. */
- if (leaf.lf_header.mh_type != GFS2_METATYPE_LF) {
- log_err( _("Inode %llu (0x%llx"
- ") points to bad leaf %llu"
- " (0x%llx).
"),
- (unsigned long long)
- ip->i_di.di_num.no_addr,
- (unsigned long long)
- ip->i_di.di_num.no_addr,
- (unsigned long long)leaf_no,
- (unsigned long long)leaf_no);
- brelse(lbh);
- break;
- }
- exp_count = (1 << (ip->i_di.di_depth - leaf.lf_depth));
- /*log_debug( _("expected count %u - di_depth %u,
- leaf depth %u
"),
- exp_count, ip->i_di.di_depth, leaf.lf_depth);*/
-
- if (pass->check_dentry && S_ISDIR(ip->i_di.di_mode)) {
- error = check_entries(ip, lbh, DIR_EXHASH,
- &count, pass);
-
- if (skip_this_pass || fsck_abort)
- return 0;
-
- if (error < 0) {
- stack;
- brelse(lbh);
- return -1;
- }
-
- if (count != leaf.lf_entries) {
- brelse(lbh);
- lbh = bread(sdp, leaf_no);
- gfs2_leaf_in(&leaf, lbh);
-
- log_err( _("Leaf %llu (0x%llx) entry "
- "count in directory %llu"
- " (0x%llx) doesn't match "
- "number of entries found "
- "- is %u, found %u
"),
- (unsigned long long)leaf_no,
- (unsigned long long)leaf_no,
- (unsigned long long)
- ip->i_di.di_num.no_addr,
- (unsigned long long)
- ip->i_di.di_num.no_addr,
- leaf.lf_entries, count);
- if (query( _("Update leaf entry count? (y/n) "))) {
- leaf.lf_entries = count;
- gfs2_leaf_out(&leaf, lbh);
- log_warn( _("Leaf entry count updated
"));
- } else
- log_err( _("Leaf entry count left in inconsistant state
"));
- }
- }
- brelse(lbh);
+ error = check_leaf(ip, lindex, pass, &ref_count,
+ &leaf_no, old_leaf, &bad_leaf,
+ first_ok_leaf, &leaf, &oldleaf);
old_leaf = leaf_no;
memcpy(&oldleaf, &leaf, sizeof(oldleaf));
- if (!leaf.lf_next)
+ if (!leaf.lf_next || error)
break;
leaf_no = leaf.lf_next;
log_debug( _("Leaf chain 0x%llx detected.
"),
--
1.7.7.5


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