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authorAl Viro <viro@zeniv.linux.org.uk>2020-06-15 02:04:42 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2020-06-15 02:04:42 +0300
commit067c054fb9c90811ae38898ce649f8dafa13354c (patch)
tree43d5ab6f4005b6e53d9a52e4cc7e8a5ffd6329fe /fs/ocfs2/dlmfs
parentb3a9e3b9622ae10064826dccb4f7a52bd88c7407 (diff)
downloadlinux-067c054fb9c90811ae38898ce649f8dafa13354c.tar.xz
dlmfs: clean up dlmfs_file_{read,write}() a bit
The damn file is constant-sized - 64 bytes. IOW, * i_size_read() is pointless * so's dynamic allocation * so's the 'size' argument of user_dlm_read_lvb() * ... and so's open-coding simple_read_from_buffer(), while we are at it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ocfs2/dlmfs')
-rw-r--r--fs/ocfs2/dlmfs/dlmfs.c52
-rw-r--r--fs/ocfs2/dlmfs/userdlm.c12
-rw-r--r--fs/ocfs2/dlmfs/userdlm.h4
3 files changed, 13 insertions, 55 deletions
diff --git a/fs/ocfs2/dlmfs/dlmfs.c b/fs/ocfs2/dlmfs/dlmfs.c
index ea868c6f9800..583820ec63e2 100644
--- a/fs/ocfs2/dlmfs/dlmfs.c
+++ b/fs/ocfs2/dlmfs/dlmfs.c
@@ -221,47 +221,17 @@ static __poll_t dlmfs_file_poll(struct file *file, poll_table *wait)
return event;
}
-static ssize_t dlmfs_file_read(struct file *filp,
+static ssize_t dlmfs_file_read(struct file *file,
char __user *buf,
size_t count,
loff_t *ppos)
{
- int bytes_left;
- ssize_t got;
- char *lvb_buf;
- struct inode *inode = file_inode(filp);
-
- mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
- inode->i_ino, count, *ppos);
+ char lvb[DLM_LVB_LEN];
- if (*ppos >= i_size_read(inode))
+ if (!user_dlm_read_lvb(file_inode(file), lvb))
return 0;
- /* don't read past the lvb */
- if (count > i_size_read(inode) - *ppos)
- count = i_size_read(inode) - *ppos;
-
- if (!count)
- return 0;
-
- lvb_buf = kmalloc(count, GFP_NOFS);
- if (!lvb_buf)
- return -ENOMEM;
-
- got = user_dlm_read_lvb(inode, lvb_buf, count);
- if (got) {
- BUG_ON(got != count);
- bytes_left = copy_to_user(buf, lvb_buf, count);
- count -= bytes_left;
- } else
- count = 0;
-
- kfree(lvb_buf);
-
- *ppos = *ppos + count;
-
- mlog(0, "read %zu bytes\n", count);
- return count;
+ return simple_read_from_buffer(buf, count, ppos, lvb, sizeof(lvb));
}
static ssize_t dlmfs_file_write(struct file *filp,
@@ -269,34 +239,28 @@ static ssize_t dlmfs_file_write(struct file *filp,
size_t count,
loff_t *ppos)
{
+ char lvb_buf[DLM_LVB_LEN];
int bytes_left;
- char *lvb_buf;
struct inode *inode = file_inode(filp);
mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
inode->i_ino, count, *ppos);
- if (*ppos >= i_size_read(inode))
+ if (*ppos >= DLM_LVB_LEN)
return -ENOSPC;
/* don't write past the lvb */
- if (count > i_size_read(inode) - *ppos)
- count = i_size_read(inode) - *ppos;
+ if (count > DLM_LVB_LEN - *ppos)
+ count = DLM_LVB_LEN - *ppos;
if (!count)
return 0;
- lvb_buf = kmalloc(count, GFP_NOFS);
- if (!lvb_buf)
- return -ENOMEM;
-
bytes_left = copy_from_user(lvb_buf, buf, count);
count -= bytes_left;
if (count)
user_dlm_write_lvb(inode, lvb_buf, count);
- kfree(lvb_buf);
-
*ppos = *ppos + count;
mlog(0, "wrote %zu bytes\n", count);
return count;
diff --git a/fs/ocfs2/dlmfs/userdlm.c b/fs/ocfs2/dlmfs/userdlm.c
index 3df5be25bfb1..339f098d9592 100644
--- a/fs/ocfs2/dlmfs/userdlm.c
+++ b/fs/ocfs2/dlmfs/userdlm.c
@@ -547,24 +547,20 @@ void user_dlm_write_lvb(struct inode *inode,
spin_unlock(&lockres->l_lock);
}
-ssize_t user_dlm_read_lvb(struct inode *inode,
- char *val,
- unsigned int len)
+bool user_dlm_read_lvb(struct inode *inode, char *val)
{
struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres;
char *lvb;
- ssize_t ret = len;
-
- BUG_ON(len > DLM_LVB_LEN);
+ bool ret = true;
spin_lock(&lockres->l_lock);
BUG_ON(lockres->l_level < DLM_LOCK_PR);
if (ocfs2_dlm_lvb_valid(&lockres->l_lksb)) {
lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
- memcpy(val, lvb, len);
+ memcpy(val, lvb, DLM_LVB_LEN);
} else
- ret = 0;
+ ret = false;
spin_unlock(&lockres->l_lock);
return ret;
diff --git a/fs/ocfs2/dlmfs/userdlm.h b/fs/ocfs2/dlmfs/userdlm.h
index 4bef7cdef859..0558ae768200 100644
--- a/fs/ocfs2/dlmfs/userdlm.h
+++ b/fs/ocfs2/dlmfs/userdlm.h
@@ -66,9 +66,7 @@ void user_dlm_cluster_unlock(struct user_lock_res *lockres,
void user_dlm_write_lvb(struct inode *inode,
const char *val,
unsigned int len);
-ssize_t user_dlm_read_lvb(struct inode *inode,
- char *val,
- unsigned int len);
+bool user_dlm_read_lvb(struct inode *inode, char *val);
struct ocfs2_cluster_connection *user_dlm_register(const struct qstr *name);
void user_dlm_unregister(struct ocfs2_cluster_connection *conn);
void user_dlm_set_locking_protocol(void);