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Code

[readdir] convert coda

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-05-22 21:15:30 -04:00
parent 3704412bdb
commit e924f25126
1 changed files with 19 additions and 58 deletions
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77
fs/coda/dir.c
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@ -43,15 +43,14 @@ static int coda_rename(struct inode *old_inode, struct dentry *old_dentry,
struct inode *new_inode, struct dentry *new_dentry);
/* dir file-ops */
static int coda_readdir(struct file *file, void *buf, filldir_t filldir);
static int coda_readdir(struct file *file, struct dir_context *ctx);
/* dentry ops */
static int coda_dentry_revalidate(struct dentry *de, unsigned int flags);
static int coda_dentry_delete(const struct dentry *);
/* support routines */
static int coda_venus_readdir(struct file *coda_file, void *buf,
filldir_t filldir);
static int coda_venus_readdir(struct file *, struct dir_context *);
/* same as fs/bad_inode.c */
static int coda_return_EIO(void)
@ -85,7 +84,7 @@ const struct inode_operations coda_dir_inode_operations =
const struct file_operations coda_dir_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
.readdir = coda_readdir,
.iterate = coda_readdir,
.open = coda_open,
.release = coda_release,
.fsync = coda_fsync,
@ -378,7 +377,7 @@ static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
/* file operations for directories */
static int coda_readdir(struct file *coda_file, void *buf, filldir_t filldir)
static int coda_readdir(struct file *coda_file, struct dir_context *ctx)
{
struct coda_file_info *cfi;
struct file *host_file;
@ -391,28 +390,8 @@ static int coda_readdir(struct file *coda_file, void *buf, filldir_t filldir)
if (!host_file->f_op)
return -ENOTDIR;
if (host_file->f_op->readdir) {
/* potemkin case: we were handed a directory inode.
* We can't use vfs_readdir because we have to keep the file
* position in sync between the coda_file and the host_file.
* and as such we need grab the inode mutex. */
if (host_file->f_op->iterate) {
struct inode *host_inode = file_inode(host_file);
mutex_lock(&host_inode->i_mutex);
host_file->f_pos = coda_file->f_pos;
ret = -ENOENT;
if (!IS_DEADDIR(host_inode)) {
ret = host_file->f_op->readdir(host_file, buf, filldir);
file_accessed(host_file);
}
coda_file->f_pos = host_file->f_pos;
mutex_unlock(&host_inode->i_mutex);
} else if (host_file->f_op->iterate) {
struct inode *host_inode = file_inode(host_file);
struct dir_context *ctx = buf;
mutex_lock(&host_inode->i_mutex);
ret = -ENOENT;
if (!IS_DEADDIR(host_inode)) {
@ -420,12 +399,10 @@ static int coda_readdir(struct file *coda_file, void *buf, filldir_t filldir)
file_accessed(host_file);
}
mutex_unlock(&host_inode->i_mutex);
coda_file->f_pos = ctx->pos;
} else /* Venus: we must read Venus dirents from a file */
ret = coda_venus_readdir(coda_file, buf, filldir);
return ret;
return ret;
}
/* Venus: we must read Venus dirents from a file */
return coda_venus_readdir(coda_file, ctx);
}
static inline unsigned int CDT2DT(unsigned char cdt)
@ -448,10 +425,8 @@ static inline unsigned int CDT2DT(unsigned char cdt)
}
/* support routines */
static int coda_venus_readdir(struct file *coda_file, void *buf,
filldir_t filldir)
static int coda_venus_readdir(struct file *coda_file, struct dir_context *ctx)
{
int result = 0; /* # of entries returned */
struct coda_file_info *cfi;
struct coda_inode_info *cii;
struct file *host_file;
@ -473,23 +448,12 @@ static int coda_venus_readdir(struct file *coda_file, void *buf,
vdir = kmalloc(sizeof(*vdir), GFP_KERNEL);
if (!vdir) return -ENOMEM;
if (coda_file->f_pos == 0) {
ret = filldir(buf, ".", 1, 0, de->d_inode->i_ino, DT_DIR);
if (ret < 0)
goto out;
result++;
coda_file->f_pos++;
}
if (coda_file->f_pos == 1) {
ret = filldir(buf, "..", 2, 1, parent_ino(de), DT_DIR);
if (ret < 0)
goto out;
result++;
coda_file->f_pos++;
}
if (!dir_emit_dots(coda_file, ctx))
goto out;
while (1) {
/* read entries from the directory file */
ret = kernel_read(host_file, coda_file->f_pos - 2, (char *)vdir,
ret = kernel_read(host_file, ctx->pos - 2, (char *)vdir,
sizeof(*vdir));
if (ret < 0) {
printk(KERN_ERR "coda readdir: read dir %s failed %d\n",
@ -518,7 +482,7 @@ static int coda_venus_readdir(struct file *coda_file, void *buf,
/* Make sure we skip '.' and '..', we already got those */
if (name.name[0] == '.' && (name.len == 1 ||
(vdir->d_name[1] == '.' && name.len == 2)))
(name.name[1] == '.' && name.len == 2)))
vdir->d_fileno = name.len = 0;
/* skip null entries */
@ -531,19 +495,16 @@ static int coda_venus_readdir(struct file *coda_file, void *buf,
if (!ino) ino = vdir->d_fileno;
type = CDT2DT(vdir->d_type);
ret = filldir(buf, name.name, name.len,
coda_file->f_pos, ino, type);
/* failure means no space for filling in this round */
if (ret < 0) break;
result++;
if (!dir_emit(ctx, name.name, name.len, ino, type))
break;
}
/* we'll always have progress because d_reclen is unsigned and
* we've already established it is non-zero. */
coda_file->f_pos += vdir->d_reclen;
ctx->pos += vdir->d_reclen;
}
out:
kfree(vdir);
return result ? result : ret;
return 0;
}
/* called when a cache lookup succeeds */