gfs2-utils/SOURCES/bz1833141-1-gfs2_jadd_Handle_out_of_space_issues.patch

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2020-07-28 07:39:53 +00:00
commit d033351753e1c45e6be74342d05de0a2501d5211
Author: Abhi Das <adas@redhat.com>
Date: Mon May 11 09:22:31 2020 -0500
gfs2_jadd: Handle out-of-space issues
If gfs2_jadd runs out of disk space while adding journals, it does
not exit gracefully. It partially does its job and bails out when
it hits -ENOSPC. This leaves the metafs mounted and most likely a
corrupted filesystem that even fsck.gfs2 can't fix.
This patch adds a pre-check that ensures that the journals requested
will fit in the available space before proceeding. Note that this is
not foolproof because gfs2_jadd operates on a mounted filesystem.
While it is required that the filesystem be idle (and mounted on only
one node) while gfs2_jadd is being run, there is nothing stopping a
user from having some I/O process competing with gfs2_jadd for disk
blocks and consequently crashing it.
Resolves: rhbz#1833141
Signed-off-by: Abhi Das <adas@redhat.com>
diff --git a/gfs2/mkfs/main_jadd.c b/gfs2/mkfs/main_jadd.c
index efe91e30..c5424803 100644
--- a/gfs2/mkfs/main_jadd.c
+++ b/gfs2/mkfs/main_jadd.c
@@ -396,6 +396,8 @@ static void gather_info(struct gfs2_sbd *sdp, struct jadd_opts *opts)
exit(EXIT_FAILURE);
}
sdp->bsize = statbuf.f_bsize;
+ sdp->blks_total = statbuf.f_blocks;
+ sdp->blks_alloced = sdp->blks_total - statbuf.f_bfree;
}
static void find_current_journals(struct jadd_opts *opts)
@@ -527,13 +529,43 @@ static void add_j(struct gfs2_sbd *sdp, struct jadd_opts *opts)
}
}
+static int check_fit(struct gfs2_sbd *sdp, struct jadd_opts *opts)
+{
+ /* Compute how much space we'll need for the new journals
+ * Number of blocks needed per added journal:
+ * 1 block for the ir inode
+ * 1 block for the sc inode
+ * for sizes of the qc and journal inodes, use lgfs2_space_for_data()
+ * to calculate.
+ */
+ uint64_t blks_per_j, total_blks;
+
+ blks_per_j = 1 + 1 +
+ lgfs2_space_for_data(sdp, sdp->bsize, sdp->qcsize << 20) +
+ lgfs2_space_for_data(sdp, sdp->bsize, sdp->jsize << 20);
+ total_blks = opts->journals * blks_per_j;
+
+ if (total_blks > (sdp->blks_total - sdp->blks_alloced)) {
+ printf( _("\nInsufficient space on the device to add %u %uMB "
+ "journals (%uMB QC size)\n\n"),
+ opts->journals, sdp->jsize, sdp->qcsize);
+ printf( _("Required space : %*lu blks (%lu blks per "
+ "journal)\n"), 10, total_blks, blks_per_j);
+ printf( _("Available space : %*lu blks\n\n"), 10,
+ sdp->blks_total - sdp->blks_alloced);
+ errno = ENOSPC;
+ return 1;
+ }
+ return 0;
+}
+
int main(int argc, char *argv[])
{
struct jadd_opts opts = {0};
struct gfs2_sbd sbd, *sdp = &sbd;
struct metafs mfs = {0};
struct mntent *mnt;
- unsigned int total;
+ unsigned int total, ret = 0;
setlocale(LC_ALL, "");
textdomain("gfs2-utils");
@@ -574,6 +606,12 @@ int main(int argc, char *argv[])
}
find_current_journals(&opts);
+ ret = check_fit(sdp, &opts);
+ if (ret) {
+ perror(_("Failed to add journals"));
+ goto out;
+ }
+
total = opts.orig_journals + opts.journals;
for (opts.journals = opts.orig_journals;
opts.journals < total;
@@ -588,13 +626,16 @@ int main(int argc, char *argv[])
add_j(sdp, &opts);
}
+out:
free(opts.new_inode);
free(opts.per_node);
free(opts.jindex);
close(sdp->path_fd);
cleanup_metafs(&mfs);
sync();
- print_results(&opts);
- return 0;
+ if (!ret)
+ print_results(&opts);
+
+ return ret;
}