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author | Alexander Aring <aahringo@redhat.com> | 2021-11-02 15:17:23 -0400 |
---|---|---|
committer | David Teigland <teigland@redhat.com> | 2021-11-02 14:39:20 -0500 |
commit | 63eab2b00bcff620682e8570367458c9619a9970 (patch) | |
tree | dad15a9f20972da5929364405c074f53f08b14f3 /fs/dlm | |
parent | 5054e79de99984b4f39a073534526bc7c827b1e0 (diff) | |
download | linux-63eab2b00bcff620682e8570367458c9619a9970.tar.gz linux-63eab2b00bcff620682e8570367458c9619a9970.tar.bz2 linux-63eab2b00bcff620682e8570367458c9619a9970.zip |
fs: dlm: add lkb waiters debugfs functionality
This patch adds functionality to put a lkb to the waiters state. It can
be useful to combine this feature with the "rawmsg" debugfs
functionality. It will bring the DLM lkb into a state that a message
will be parsed by the kernel.
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
Diffstat (limited to 'fs/dlm')
-rw-r--r-- | fs/dlm/debug_fs.c | 27 | ||||
-rw-r--r-- | fs/dlm/lock.c | 15 | ||||
-rw-r--r-- | fs/dlm/lock.h | 2 |
3 files changed, 43 insertions, 1 deletions
diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c index 2ead4751d655..df6f3f107be4 100644 --- a/fs/dlm/debug_fs.c +++ b/fs/dlm/debug_fs.c @@ -754,10 +754,35 @@ static ssize_t waiters_read(struct file *file, char __user *userbuf, return rv; } +static ssize_t waiters_write(struct file *file, const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct dlm_ls *ls = file->private_data; + int mstype, to_nodeid; + char buf[128] = {}; + uint32_t lkb_id; + int n, error; + + if (copy_from_user(buf, user_buf, + min_t(size_t, sizeof(buf) - 1, count))) + return -EFAULT; + + n = sscanf(buf, "%x %d %d", &lkb_id, &mstype, &to_nodeid); + if (n != 3) + return -EINVAL; + + error = dlm_debug_add_lkb_to_waiters(ls, lkb_id, mstype, to_nodeid); + if (error) + return error; + + return count; +} + static const struct file_operations waiters_fops = { .owner = THIS_MODULE, .open = simple_open, .read = waiters_read, + .write = waiters_write, .llseek = default_llseek, }; @@ -907,7 +932,7 @@ void dlm_create_debug_file(struct dlm_ls *ls) snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_waiters", ls->ls_name); ls->ls_debug_waiters_dentry = debugfs_create_file(name, - S_IFREG | S_IRUGO, + 0644, dlm_root, ls, &waiters_fops); diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c index aeb793693d8c..0dbe273566c0 100644 --- a/fs/dlm/lock.c +++ b/fs/dlm/lock.c @@ -6363,3 +6363,18 @@ int dlm_debug_add_lkb(struct dlm_ls *ls, uint32_t lkb_id, char *name, int len, return 0; } +int dlm_debug_add_lkb_to_waiters(struct dlm_ls *ls, uint32_t lkb_id, + int mstype, int to_nodeid) +{ + struct dlm_lkb *lkb; + int error; + + error = find_lkb(ls, lkb_id, &lkb); + if (error) + return error; + + error = add_to_waiters(lkb, mstype, to_nodeid); + dlm_put_lkb(lkb); + return error; +} + diff --git a/fs/dlm/lock.h b/fs/dlm/lock.h index 863a66e128a2..252a5898f908 100644 --- a/fs/dlm/lock.h +++ b/fs/dlm/lock.h @@ -60,6 +60,8 @@ int dlm_user_deadlock(struct dlm_ls *ls, uint32_t flags, uint32_t lkid); void dlm_clear_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc); int dlm_debug_add_lkb(struct dlm_ls *ls, uint32_t lkb_id, char *name, int len, int lkb_nodeid, unsigned int lkb_flags, int lkb_status); +int dlm_debug_add_lkb_to_waiters(struct dlm_ls *ls, uint32_t lkb_id, + int mstype, int to_nodeid); static inline int is_master(struct dlm_rsb *r) { |