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From e1e07c9aeacf71f3f95cbc4b2862e622962907cb Mon Sep 17 00:00:00 2001
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From: Roberto Bergantinos Corpas <rbergant@redhat.com>
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Date: Mon, 27 Apr 2020 15:46:02 +0200
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Subject: [PATCH] libmount: fix mount -a EBUSY for cifs
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fstab:
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//rhel73/myshare/sub/path /mnt cifs
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after mount in mountinfo:
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# grep cifs /proc/self/mountinfo
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47 39 0:40 /sub/path /mnt rw,relatime shared:60 - cifs //rhel73/myshare/sub/path ...
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^^^^^^^^^
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or:
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# grep cifs /proc/self/mountinfo
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47 39 0:40 / /mnt rw,relatime shared:60 - cifs //rhel73/myshare/sub/path ...
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^
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That is so since on kernel cifs code, cifs_get_root (which returns the
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entry associated with mnt_root) return s_root if
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CIFS_MOUNT_USE_PREFIX_PATH is set, no questions asked.
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This situation can occurr often on CIFS mounts, as CIFS servers limit
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frequently scope of access to the root path.
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[kzak@redhat.com: - add more info to the commit message,
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- clean up variable names]
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1826719
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Upstream: http://github.com/karelzak/util-linux/commit/31b3a523eca2fc7e5876ec5fd89094208fed0899
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Signed-off-by: Roberto Bergantinos Corpas <rbergant@redhat.com>
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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libmount/src/tab.c | 9 ++++++---
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1 file changed, 6 insertions(+), 3 deletions(-)
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diff --git a/libmount/src/tab.c b/libmount/src/tab.c
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index 575b33d8c..89c84c99b 100644
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--- a/libmount/src/tab.c
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+++ b/libmount/src/tab.c
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@@ -1181,9 +1181,12 @@ int mnt_table_is_fs_mounted(struct libmnt_table *tb, struct libmnt_fs *fstab_fs)
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if (root) {
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if (strcmp(mnt_fs_get_fstype(fs), "cifs") == 0) {
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- const char *unc_subdir = get_cifs_unc_subdir_path(src);
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- const char *path_on_fs = mnt_fs_get_root(fs);
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- if (!unc_subdir || !path_on_fs || !streq_paths(unc_subdir, path_on_fs))
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+
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+ const char *sub = get_cifs_unc_subdir_path(src);
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+ const char *r = mnt_fs_get_root(fs);
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+
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+ if (!sub || !r || (!streq_paths(sub, r) &&
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+ !streq_paths("/", r)))
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continue;
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} else {
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const char *r = mnt_fs_get_root(fs);
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--
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2.25.4
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