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commit 2f57a96ce27d8b121c2822de2a66c71b83bdad21
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Author: Dave Anderson <anderson@redhat.com>
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Date: Tue Sep 4 14:29:45 2018 -0400
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Fix for the "files" command in Linux 4.17 and later kernels that
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contain commit b93b016313b3ba8003c3b8bb71f569af91f19fc7, titled
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"page cache: use xa_lock". Without the patch, the "files -c" option
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fails with the message "files: -c option not supported or applicable
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on this architecture or kernel", and the "files -p <inode>" option
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fails in a similar manner.
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(k-hagio@ab.jp.nec.com)
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diff --git a/filesys.c b/filesys.c
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index 47f5a24..32daa5a 100644
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--- a/filesys.c
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+++ b/filesys.c
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@@ -2207,6 +2207,11 @@ dump_inode_page_cache_info(ulong inode)
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RJUST|LONG_DEC,
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MKSTR(nrpages)));
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+ FREEBUF(inode_buf);
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+
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+ if (!nrpages)
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+ return;
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+
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root_rnode = i_mapping + OFFSET(address_space_page_tree);
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rtp.index = 0;
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rtp.value = (void *)&dump_inode_page;
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@@ -2217,7 +2222,6 @@ dump_inode_page_cache_info(ulong inode)
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error(INFO, "page_tree count: %ld nrpages: %ld\n",
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count, nrpages);
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- FREEBUF(inode_buf);
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return;
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}
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@@ -2275,7 +2279,7 @@ cmd_files(void)
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return;
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case 'c':
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- if (VALID_MEMBER(address_space_page_tree) &&
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+ if (VALID_MEMBER(address_space_nrpages) &&
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VALID_MEMBER(inode_i_mapping))
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open_flags |= PRINT_NRPAGES;
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else
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diff --git a/memory.c b/memory.c
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index 24fce5e..ea25047 100644
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--- a/memory.c
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+++ b/memory.c
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@@ -485,6 +485,8 @@ vm_init(void)
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MEMBER_OFFSET_INIT(block_device_bd_disk, "block_device", "bd_disk");
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MEMBER_OFFSET_INIT(inode_i_mapping, "inode", "i_mapping");
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MEMBER_OFFSET_INIT(address_space_page_tree, "address_space", "page_tree");
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+ if (INVALID_MEMBER(address_space_page_tree))
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+ MEMBER_OFFSET_INIT(address_space_page_tree, "address_space", "i_pages");
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MEMBER_OFFSET_INIT(address_space_nrpages, "address_space", "nrpages");
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if (INVALID_MEMBER(address_space_nrpages))
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MEMBER_OFFSET_INIT(address_space_nrpages, "address_space", "__nrpages");
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