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authorAndreas Gruenbacher <agruenba@redhat.com>2018-02-06 17:20:55 +0300
committerBob Peterson <rpeterso@redhat.com>2018-02-13 23:38:10 +0300
commit49edd5bf429c405b3a7f75503845d9f66a47dd4b (patch)
treea2443f59d6135f76bb78aff17981f9e47d87bc7c /fs/gfs2/bmap.c
parent35277995e17919ab838beae765f440674e8576eb (diff)
downloadlinux-49edd5bf429c405b3a7f75503845d9f66a47dd4b.tar.xz
gfs2: Fixes to "Implement iomap for block_map"
It turns out that commit 3974320ca6 "Implement iomap for block_map" introduced a few bugs that trigger occasional failures with xfstest generic/476: In gfs2_iomap_begin, we jump to do_alloc when we determine that we are beyond the end of the allocated metadata (height > ip->i_height). There, we can end up calling hole_size with a metapath that doesn't match the current metadata tree, which doesn't make sense. After untangling the code at do_alloc, fix this by checking if the block we are looking for is within the range of allocated metadata. In addition, add a BUG() in case gfs2_iomap_begin is accidentally called for reading stuffed files: this is handled separately. Make sure we don't truncate iomap->length for reads beyond the end of the file; in that case, the entire range counts as a hole. Finally, revert to taking a bitmap write lock when doing allocations. It's unclear why that change didn't lead to any failures during testing. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Diffstat (limited to 'fs/gfs2/bmap.c')
-rw-r--r--fs/gfs2/bmap.c43
1 files changed, 23 insertions, 20 deletions
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 86863792f36a..86d6a4435c87 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -716,7 +716,7 @@ int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
__be64 *ptr;
sector_t lblock;
sector_t lend;
- int ret;
+ int ret = 0;
int eob;
unsigned int len;
struct buffer_head *bh;
@@ -728,12 +728,14 @@ int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
goto out;
}
- if ((flags & IOMAP_REPORT) && gfs2_is_stuffed(ip)) {
- gfs2_stuffed_iomap(inode, iomap);
- if (pos >= iomap->length)
- return -ENOENT;
- ret = 0;
- goto out;
+ if (gfs2_is_stuffed(ip)) {
+ if (flags & IOMAP_REPORT) {
+ gfs2_stuffed_iomap(inode, iomap);
+ if (pos >= iomap->length)
+ ret = -ENOENT;
+ goto out;
+ }
+ BUG_ON(!(flags & IOMAP_WRITE));
}
lblock = pos >> inode->i_blkbits;
@@ -744,7 +746,7 @@ int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
iomap->type = IOMAP_HOLE;
iomap->length = (u64)(lend - lblock) << inode->i_blkbits;
iomap->flags = IOMAP_F_MERGED;
- bmap_lock(ip, 0);
+ bmap_lock(ip, flags & IOMAP_WRITE);
/*
* Directory data blocks have a struct gfs2_meta_header header, so the
@@ -787,27 +789,28 @@ int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
iomap->flags |= IOMAP_F_BOUNDARY;
iomap->length = (u64)len << inode->i_blkbits;
- ret = 0;
-
out_release:
release_metapath(&mp);
- bmap_unlock(ip, 0);
+ bmap_unlock(ip, flags & IOMAP_WRITE);
out:
trace_gfs2_iomap_end(ip, iomap, ret);
return ret;
do_alloc:
- if (!(flags & IOMAP_WRITE)) {
- if (pos >= i_size_read(inode)) {
+ if (flags & IOMAP_WRITE) {
+ ret = gfs2_iomap_alloc(inode, iomap, flags, &mp);
+ } else if (flags & IOMAP_REPORT) {
+ loff_t size = i_size_read(inode);
+ if (pos >= size)
ret = -ENOENT;
- goto out_release;
- }
- ret = 0;
- iomap->length = hole_size(inode, lblock, &mp);
- goto out_release;
+ else if (height <= ip->i_height)
+ iomap->length = hole_size(inode, lblock, &mp);
+ else
+ iomap->length = size - pos;
+ } else {
+ if (height <= ip->i_height)
+ iomap->length = hole_size(inode, lblock, &mp);
}
-
- ret = gfs2_iomap_alloc(inode, iomap, flags, &mp);
goto out_release;
}