de5fe16817
The content of this branch was automatically imported from Fedora ELN with the following as its source: https://src.fedoraproject.org/rpms/device-mapper-multipath#2cf40b2f98808e3533e915c0a204b885d9da5e43
109 lines
3.6 KiB
Diff
109 lines
3.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Benjamin Marzinski <bmarzins@redhat.com>
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Date: Tue, 19 May 2020 12:08:41 -0500
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Subject: [PATCH] libmultipath: make sysfs_is_multipathed able to return wwid
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sysfs_is_multipathed reads the wwid of the dm device holding a path to
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check if its a multipath device. Add code to optinally set pp->wwid to
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that wwid. This will be used by a future patch.
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Reviewed-by: Martin Wilck <mwilck@suse.com>
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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---
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libmultipath/sysfs.c | 24 +++++++++++++++++++-----
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libmultipath/sysfs.h | 2 +-
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multipath/main.c | 7 ++++---
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3 files changed, 24 insertions(+), 9 deletions(-)
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diff --git a/libmultipath/sysfs.c b/libmultipath/sysfs.c
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index 62ec2ed7..12a82d95 100644
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--- a/libmultipath/sysfs.c
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+++ b/libmultipath/sysfs.c
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@@ -295,7 +295,7 @@ static int select_dm_devs(const struct dirent *di)
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return fnmatch("dm-*", di->d_name, FNM_FILE_NAME) == 0;
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}
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-bool sysfs_is_multipathed(const struct path *pp)
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+bool sysfs_is_multipathed(struct path *pp, bool set_wwid)
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{
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char pathbuf[PATH_MAX];
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struct scandir_result sr;
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@@ -325,7 +325,7 @@ bool sysfs_is_multipathed(const struct path *pp)
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for (i = 0; i < r && !found; i++) {
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long fd;
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int nr;
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- char uuid[6];
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+ char uuid[WWID_SIZE + UUID_PREFIX_LEN];
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if (safe_snprintf(pathbuf + n, sizeof(pathbuf) - n,
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"/%s/dm/uuid", di[i]->d_name))
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@@ -339,12 +339,26 @@ bool sysfs_is_multipathed(const struct path *pp)
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pthread_cleanup_push(close_fd, (void *)fd);
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nr = read(fd, uuid, sizeof(uuid));
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- if (nr == sizeof(uuid) && !memcmp(uuid, "mpath-", sizeof(uuid)))
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+ if (nr > (int)UUID_PREFIX_LEN &&
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+ !memcmp(uuid, UUID_PREFIX, UUID_PREFIX_LEN))
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found = true;
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else if (nr < 0) {
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- condlog(1, "%s: error reading from %s: %s",
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- __func__, pathbuf, strerror(errno));
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+ condlog(1, "%s: error reading from %s: %m",
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+ __func__, pathbuf);
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}
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+ if (found && set_wwid) {
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+ nr -= UUID_PREFIX_LEN;
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+ memcpy(pp->wwid, uuid + UUID_PREFIX_LEN, nr);
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+ if (nr == WWID_SIZE) {
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+ condlog(4, "%s: overflow while reading from %s",
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+ __func__, pathbuf);
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+ pp->wwid[0] = '\0';
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+ } else {
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+ pp->wwid[nr] = '\0';
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+ strchop(pp->wwid);
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+ }
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+ }
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+
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pthread_cleanup_pop(1);
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}
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pthread_cleanup_pop(1);
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diff --git a/libmultipath/sysfs.h b/libmultipath/sysfs.h
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index 9ae30b39..72b39ab2 100644
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--- a/libmultipath/sysfs.h
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+++ b/libmultipath/sysfs.h
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@@ -14,5 +14,5 @@ ssize_t sysfs_bin_attr_get_value(struct udev_device *dev, const char *attr_name,
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unsigned char * value, size_t value_len);
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int sysfs_get_size (struct path *pp, unsigned long long * size);
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int sysfs_check_holders(char * check_devt, char * new_devt);
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-bool sysfs_is_multipathed(const struct path *pp);
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+bool sysfs_is_multipathed(struct path *pp, bool set_wwid);
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#endif
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diff --git a/multipath/main.c b/multipath/main.c
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index cf9d2a28..545ead87 100644
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--- a/multipath/main.c
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+++ b/multipath/main.c
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@@ -638,7 +638,8 @@ configure (struct config *conf, enum mpath_cmds cmd,
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* Shortcut for find_multipaths smart:
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* Quick check if path is already multipathed.
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*/
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- if (sysfs_is_multipathed(VECTOR_SLOT(pathvec, 0))) {
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+ if (sysfs_is_multipathed(VECTOR_SLOT(pathvec, 0),
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+ false)) {
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r = RTVL_YES;
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goto print_valid;
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}
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@@ -747,8 +748,8 @@ configure (struct config *conf, enum mpath_cmds cmd,
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/*
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* Check if we raced with multipathd
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*/
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- r = sysfs_is_multipathed(VECTOR_SLOT(pathvec, 0)) ?
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- RTVL_YES : RTVL_NO;
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+ r = sysfs_is_multipathed(VECTOR_SLOT(pathvec, 0),
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+ false) ? RTVL_YES : RTVL_NO;
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}
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goto print_valid;
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}
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--
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2.17.2
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