coda: avoid lockdep warning in coda_readdir
Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
d9664c95af
commit
978752534e
|
@ -43,15 +43,15 @@ static int coda_rename(struct inode *old_inode, struct dentry *old_dentry,
|
||||||
struct inode *new_inode, struct dentry *new_dentry);
|
struct inode *new_inode, struct dentry *new_dentry);
|
||||||
|
|
||||||
/* dir file-ops */
|
/* dir file-ops */
|
||||||
static int coda_readdir(struct file *file, void *dirent, filldir_t filldir);
|
static int coda_readdir(struct file *file, void *buf, filldir_t filldir);
|
||||||
|
|
||||||
/* dentry ops */
|
/* dentry ops */
|
||||||
static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd);
|
static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd);
|
||||||
static int coda_dentry_delete(struct dentry *);
|
static int coda_dentry_delete(struct dentry *);
|
||||||
|
|
||||||
/* support routines */
|
/* support routines */
|
||||||
static int coda_venus_readdir(struct file *filp, filldir_t filldir,
|
static int coda_venus_readdir(struct file *coda_file, void *buf,
|
||||||
void *dirent, struct dentry *dir);
|
filldir_t filldir);
|
||||||
|
|
||||||
/* same as fs/bad_inode.c */
|
/* same as fs/bad_inode.c */
|
||||||
static int coda_return_EIO(void)
|
static int coda_return_EIO(void)
|
||||||
|
@ -448,12 +448,10 @@ static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
|
||||||
|
|
||||||
|
|
||||||
/* file operations for directories */
|
/* file operations for directories */
|
||||||
int coda_readdir(struct file *coda_file, void *dirent, filldir_t filldir)
|
int coda_readdir(struct file *coda_file, void *buf, filldir_t filldir)
|
||||||
{
|
{
|
||||||
struct dentry *coda_dentry = coda_file->f_path.dentry;
|
|
||||||
struct coda_file_info *cfi;
|
struct coda_file_info *cfi;
|
||||||
struct file *host_file;
|
struct file *host_file;
|
||||||
struct inode *host_inode;
|
|
||||||
int ret;
|
int ret;
|
||||||
|
|
||||||
cfi = CODA_FTOC(coda_file);
|
cfi = CODA_FTOC(coda_file);
|
||||||
|
@ -462,30 +460,31 @@ int coda_readdir(struct file *coda_file, void *dirent, filldir_t filldir)
|
||||||
|
|
||||||
coda_vfs_stat.readdir++;
|
coda_vfs_stat.readdir++;
|
||||||
|
|
||||||
host_inode = host_file->f_path.dentry->d_inode;
|
if (!host_file->f_op)
|
||||||
mutex_lock(&host_inode->i_mutex);
|
return -ENOTDIR;
|
||||||
host_file->f_pos = coda_file->f_pos;
|
|
||||||
|
|
||||||
if (!host_file->f_op->readdir) {
|
if (host_file->f_op->readdir)
|
||||||
/* Venus: we must read Venus dirents from the file */
|
{
|
||||||
ret = coda_venus_readdir(host_file, filldir, dirent, coda_dentry);
|
/* potemkin case: we were handed a directory inode.
|
||||||
} else {
|
* We can't use vfs_readdir because we have to keep the file
|
||||||
/* potemkin case: we were handed a directory inode. */
|
* position in sync between the coda_file and the host_file.
|
||||||
/* Yuk, we can't call vfs_readdir because we are already
|
* and as such we need grab the inode mutex. */
|
||||||
* holding the inode semaphore. */
|
struct inode *host_inode = host_file->f_path.dentry->d_inode;
|
||||||
ret = -ENOTDIR;
|
|
||||||
if (!host_file->f_op || !host_file->f_op->readdir)
|
mutex_lock(&host_inode->i_mutex);
|
||||||
goto out;
|
host_file->f_pos = coda_file->f_pos;
|
||||||
|
|
||||||
ret = -ENOENT;
|
ret = -ENOENT;
|
||||||
if (!IS_DEADDIR(host_inode)) {
|
if (!IS_DEADDIR(host_inode)) {
|
||||||
ret = host_file->f_op->readdir(host_file, dirent, filldir);
|
ret = host_file->f_op->readdir(host_file, buf, filldir);
|
||||||
file_accessed(host_file);
|
file_accessed(host_file);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
coda_file->f_pos = host_file->f_pos;
|
||||||
|
mutex_unlock(&host_inode->i_mutex);
|
||||||
}
|
}
|
||||||
out:
|
else /* Venus: we must read Venus dirents from a file */
|
||||||
coda_file->f_pos = host_file->f_pos;
|
ret = coda_venus_readdir(coda_file, buf, filldir);
|
||||||
mutex_unlock(&host_inode->i_mutex);
|
|
||||||
|
|
||||||
return ret;
|
return ret;
|
||||||
}
|
}
|
||||||
|
@ -510,57 +509,68 @@ static inline unsigned int CDT2DT(unsigned char cdt)
|
||||||
}
|
}
|
||||||
|
|
||||||
/* support routines */
|
/* support routines */
|
||||||
static int coda_venus_readdir(struct file *filp, filldir_t filldir,
|
static int coda_venus_readdir(struct file *coda_file, void *buf,
|
||||||
void *dirent, struct dentry *dir)
|
filldir_t filldir)
|
||||||
{
|
{
|
||||||
int result = 0; /* # of entries returned */
|
int result = 0; /* # of entries returned */
|
||||||
|
struct coda_file_info *cfi;
|
||||||
|
struct coda_inode_info *cii;
|
||||||
|
struct file *host_file;
|
||||||
|
struct dentry *de;
|
||||||
struct venus_dirent *vdir;
|
struct venus_dirent *vdir;
|
||||||
unsigned long vdir_size =
|
unsigned long vdir_size =
|
||||||
(unsigned long)(&((struct venus_dirent *)0)->d_name);
|
(unsigned long)(&((struct venus_dirent *)0)->d_name);
|
||||||
unsigned int type;
|
unsigned int type;
|
||||||
struct qstr name;
|
struct qstr name;
|
||||||
ino_t ino;
|
ino_t ino;
|
||||||
int ret, i;
|
int ret;
|
||||||
|
|
||||||
|
cfi = CODA_FTOC(coda_file);
|
||||||
|
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
|
||||||
|
host_file = cfi->cfi_container;
|
||||||
|
|
||||||
|
de = coda_file->f_path.dentry;
|
||||||
|
cii = ITOC(de->d_inode);
|
||||||
|
|
||||||
vdir = kmalloc(sizeof(*vdir), GFP_KERNEL);
|
vdir = kmalloc(sizeof(*vdir), GFP_KERNEL);
|
||||||
if (!vdir) return -ENOMEM;
|
if (!vdir) return -ENOMEM;
|
||||||
|
|
||||||
i = filp->f_pos;
|
switch (coda_file->f_pos) {
|
||||||
switch(i) {
|
|
||||||
case 0:
|
case 0:
|
||||||
ret = filldir(dirent, ".", 1, 0, dir->d_inode->i_ino, DT_DIR);
|
ret = filldir(buf, ".", 1, 0, de->d_inode->i_ino, DT_DIR);
|
||||||
if (ret < 0) break;
|
if (ret < 0) break;
|
||||||
result++;
|
result++;
|
||||||
filp->f_pos++;
|
coda_file->f_pos++;
|
||||||
/* fallthrough */
|
/* fallthrough */
|
||||||
case 1:
|
case 1:
|
||||||
ret = filldir(dirent, "..", 2, 1, dir->d_parent->d_inode->i_ino, DT_DIR);
|
ret = filldir(buf, "..", 2, 1, de->d_parent->d_inode->i_ino, DT_DIR);
|
||||||
if (ret < 0) break;
|
if (ret < 0) break;
|
||||||
result++;
|
result++;
|
||||||
filp->f_pos++;
|
coda_file->f_pos++;
|
||||||
/* fallthrough */
|
/* fallthrough */
|
||||||
default:
|
default:
|
||||||
while (1) {
|
while (1) {
|
||||||
/* read entries from the directory file */
|
/* read entries from the directory file */
|
||||||
ret = kernel_read(filp, filp->f_pos - 2, (char *)vdir,
|
ret = kernel_read(host_file, coda_file->f_pos - 2, (char *)vdir,
|
||||||
sizeof(*vdir));
|
sizeof(*vdir));
|
||||||
if (ret < 0) {
|
if (ret < 0) {
|
||||||
printk("coda_venus_readdir: read dir failed %d\n", ret);
|
printk(KERN_ERR "coda readdir: read dir %s failed %d\n",
|
||||||
|
coda_f2s(&cii->c_fid), ret);
|
||||||
break;
|
break;
|
||||||
}
|
}
|
||||||
if (ret == 0) break; /* end of directory file reached */
|
if (ret == 0) break; /* end of directory file reached */
|
||||||
|
|
||||||
/* catch truncated reads */
|
/* catch truncated reads */
|
||||||
if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) {
|
if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) {
|
||||||
printk("coda_venus_readdir: short read: %ld\n",
|
printk(KERN_ERR "coda readdir: short read on %s\n",
|
||||||
filp->f_path.dentry->d_inode->i_ino);
|
coda_f2s(&cii->c_fid));
|
||||||
ret = -EBADF;
|
ret = -EBADF;
|
||||||
break;
|
break;
|
||||||
}
|
}
|
||||||
/* validate whether the directory file actually makes sense */
|
/* validate whether the directory file actually makes sense */
|
||||||
if (vdir->d_reclen < vdir_size + vdir->d_namlen) {
|
if (vdir->d_reclen < vdir_size + vdir->d_namlen) {
|
||||||
printk("coda_venus_readdir: Invalid dir: %ld\n",
|
printk(KERN_ERR "coda readdir: invalid dir %s\n",
|
||||||
filp->f_path.dentry->d_inode->i_ino);
|
coda_f2s(&cii->c_fid));
|
||||||
ret = -EBADF;
|
ret = -EBADF;
|
||||||
break;
|
break;
|
||||||
}
|
}
|
||||||
|
@ -579,21 +589,21 @@ static int coda_venus_readdir(struct file *filp, filldir_t filldir,
|
||||||
* userspace doesn't have to worry about breaking
|
* userspace doesn't have to worry about breaking
|
||||||
* getcwd by having mismatched inode numbers for
|
* getcwd by having mismatched inode numbers for
|
||||||
* internal volume mountpoints. */
|
* internal volume mountpoints. */
|
||||||
ino = find_inode_number(dir, &name);
|
ino = find_inode_number(de, &name);
|
||||||
if (!ino) ino = vdir->d_fileno;
|
if (!ino) ino = vdir->d_fileno;
|
||||||
|
|
||||||
type = CDT2DT(vdir->d_type);
|
type = CDT2DT(vdir->d_type);
|
||||||
ret = filldir(dirent, name.name, name.len, filp->f_pos,
|
ret = filldir(buf, name.name, name.len,
|
||||||
ino, type);
|
coda_file->f_pos, ino, type);
|
||||||
/* failure means no space for filling in this round */
|
/* failure means no space for filling in this round */
|
||||||
if (ret < 0) break;
|
if (ret < 0) break;
|
||||||
result++;
|
result++;
|
||||||
}
|
}
|
||||||
/* we'll always have progress because d_reclen is unsigned and
|
/* we'll always have progress because d_reclen is unsigned and
|
||||||
* we've already established it is non-zero. */
|
* we've already established it is non-zero. */
|
||||||
filp->f_pos += vdir->d_reclen;
|
coda_file->f_pos += vdir->d_reclen;
|
||||||
|
}
|
||||||
}
|
}
|
||||||
}
|
|
||||||
kfree(vdir);
|
kfree(vdir);
|
||||||
return result ? result : ret;
|
return result ? result : ret;
|
||||||
}
|
}
|
||||||
|
|
Loading…
Reference in New Issue