The scan owner field represents an optional inode number that is
responsible for the current scan. The purpose is to identify that an
inode is under iolock and as such, the iolock shouldn't be attempted
when trimming eofblocks. This is an internal only field.
Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx>
---
fs/xfs/xfs_icache.c | 12 +++++++++++-
fs/xfs/xfs_icache.h | 2 ++
2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index d4e15db..bd0ab7d 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -1215,6 +1215,7 @@ xfs_inode_free_eofblocks(
{
int ret;
struct xfs_eofblocks *eofb = args;
+ bool need_iolock = true;
if (!xfs_can_free_eofblocks(ip, false)) {
/* inode could be preallocated or append-only */
@@ -1234,6 +1235,15 @@ xfs_inode_free_eofblocks(
if (eofb->eof_flags & XFS_EOF_FLAGS_FLUSH)
filemap_flush(VFS_I(ip)->i_mapping);
+
+ /*
+ * A scan owner implies we already hold the iolock. Skip it in
+ * xfs_free_eofblocks() to avoid deadlock. This also eliminates
+ * the possibility of EAGAIN being returned.
+ */
+ if (eofb->eof_scan_owner != NULLFSINO &&
+ eofb->eof_scan_owner == ip->i_ino)
+ need_iolock = false;
}
/*
@@ -1244,7 +1254,7 @@ xfs_inode_free_eofblocks(
mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_DIRTY))
return 0;
- ret = xfs_free_eofblocks(ip->i_mount, ip, true);
+ ret = xfs_free_eofblocks(ip->i_mount, ip, need_iolock);
/* don't revisit the inode if we're not waiting */
if (ret == EAGAIN && !(flags & SYNC_WAIT))
diff --git a/fs/xfs/xfs_icache.h b/fs/xfs/xfs_icache.h
index 9ed68bb..4387b1d 100644
--- a/fs/xfs/xfs_icache.h
+++ b/fs/xfs/xfs_icache.h
@@ -27,6 +27,7 @@ struct xfs_eofblocks {
kgid_t eof_gid;
prid_t eof_prid;
__u64 eof_min_file_size;
+ xfs_ino_t eof_scan_owner;
};
#define SYNC_WAIT 0x0001 /* wait for i/o to complete */
@@ -86,6 +87,7 @@ xfs_fs_eofblocks_from_user(
dst->eof_flags = src->eof_flags;
dst->eof_prid = src->eof_prid;
dst->eof_min_file_size = src->eof_min_file_size;
+ dst->eof_scan_owner = NULLFSINO;
dst->eof_uid = INVALID_UID;
if (src->eof_flags & XFS_EOF_FLAGS_UID) {
--
1.8.3.1
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