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orangefs: support llseek on directories

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This and the previous commit fix xfstests generic/257.

Signed-off-by: Martin Brandenburg <martin@omnibond.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
This commit is contained in:
Martin Brandenburg 2017-04-25 15:38:00 -04:00 committed by Mike Marshall
parent 382f4581e6
commit 72f66b8329
1 changed files with 36 additions and 14 deletions
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50
fs/orangefs/dir.c
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@ -21,7 +21,7 @@
struct orangefs_dir {
__u64 token;
void *directory;
size_t i, len;
size_t len;
int error;
};
@ -132,35 +132,40 @@ static int orangefs_dir_fill(struct orangefs_inode_s *oi,
{
struct orangefs_khandle *khandle;
__u32 *len, padlen;
loff_t i;
char *s;
while (od->i < od->len) {
if (od->len < od->i + sizeof *len)
i = ctx->pos - 2;
while (i < od->len) {
if (od->len < i + sizeof *len)
goto eio;
len = od->directory + od->i;
len = od->directory + i;
/*
* len is the size of the string itself. padlen is the
* total size of the encoded string.
*/
padlen = (sizeof *len + *len + 1) +
(4 - (sizeof *len + *len + 1)%8)%8;
if (od->len < od->i + padlen + sizeof *khandle)
if (od->len < i + padlen + sizeof *khandle)
goto eio;
s = od->directory + od->i + sizeof *len;
s = od->directory + i + sizeof *len;
if (s[*len] != 0)
goto eio;
khandle = od->directory + od->i + padlen;
khandle = od->directory + i + padlen;
if (!dir_emit(ctx, s, *len,
orangefs_khandle_to_ino(khandle), DT_UNKNOWN))
return 0;
od->i += padlen + sizeof *khandle;
od->i = od->i + (8 - od->i%8)%8;
ctx->pos = 2 + od->i;
i += padlen + sizeof *khandle;
i = i + (8 - i%8)%8;
ctx->pos = i + 2;
}
BUG_ON(od->i > od->len);
BUG_ON(i > od->len);
return 0;
eio:
gossip_err("orangefs_dir_fill: userspace returns corrupt data\n");
/*
* Here either data from userspace is corrupt or the application
* has sought to an invalid location.
*/
od->error = -EIO;
return -EIO;
}
@ -193,12 +198,29 @@ static int orangefs_dir_iterate(struct file *file,
r = 0;
if (od->i < od->len) {
/*
* Must read more if the user has sought past what has been read
* so far. Stop a user who has sought past the end.
*/
while (od->token != ORANGEFS_READDIR_END && ctx->pos - 2 >
od->len) {
r = orangefs_dir_more(oi, od, dentry);
if (r)
return r;
}
if (od->token == ORANGEFS_READDIR_END && ctx->pos - 2 >
od->len) {
return -EIO;
}
/* Then try to fill if there's any left in the buffer. */
if (ctx->pos - 2 < od->len) {
r = orangefs_dir_fill(oi, od, dentry, ctx);
if (r)
return r;
}
/* Finally get some more and try to fill. */
if (od->token != ORANGEFS_READDIR_END) {
r = orangefs_dir_more(oi, od, dentry);
if (r)
@ -227,7 +249,6 @@ static int orangefs_dir_open(struct inode *inode, struct file *file)
kfree(file->private_data);
return -ENOMEM;
}
od->i = 0;
od->len = 0;
od->error = 0;
return 0;
@ -243,6 +264,7 @@ static int orangefs_dir_release(struct inode *inode, struct file *file)
}
const struct file_operations orangefs_dir_operations = {
.llseek = default_llseek,
.read = generic_read_dir,
.iterate = orangefs_dir_iterate,
.open = orangefs_dir_open,