This adds the use_fpos parameter to the iterate_dir function.
If use_fpos is true it uses the file position in the file
structure (existing behavior). If use_fpos is false, it uses
the pos in the context structure.
This change is required to support getdents in io_uring.
Signed-off-by: Stefan Roesch <shr@xxxxxx>
---
fs/exportfs/expfs.c | 2 +-
fs/nfsd/nfs4recover.c | 2 +-
fs/nfsd/vfs.c | 2 +-
fs/overlayfs/readdir.c | 6 +++---
fs/readdir.c | 28 ++++++++++++++++++++--------
include/linux/fs.h | 2 +-
6 files changed, 27 insertions(+), 15 deletions(-)
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 0106eba46d5a..0f303356f907 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -323,7 +323,7 @@ static int get_name(const struct path *path, char *name, struct dentry *child)
while (1) {
int old_seq = buffer.sequence;
- error = iterate_dir(file, &buffer.ctx);
+ error = iterate_dir(file, &buffer.ctx, true);
if (buffer.found) {
error = 0;
break;
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 6fedc49726bf..013b1a3530c9 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -307,7 +307,7 @@ nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn)
return status;
}
- status = iterate_dir(nn->rec_file, &ctx.ctx);
+ status = iterate_dir(nn->rec_file, &ctx.ctx, true);
inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
list_for_each_entry_safe(entry, tmp, &ctx.names, list) {
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index c99857689e2c..cd7a7d783fa7 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1980,7 +1980,7 @@ static __be32 nfsd_buffered_readdir(struct file *file, struct svc_fh *fhp,
buf.used = 0;
buf.full = 0;
- host_err = iterate_dir(file, &buf.ctx);
+ host_err = iterate_dir(file, &buf.ctx, true);
if (buf.full)
host_err = 0;
diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c
index 150fdf3bc68d..089150315942 100644
--- a/fs/overlayfs/readdir.c
+++ b/fs/overlayfs/readdir.c
@@ -306,7 +306,7 @@ static inline int ovl_dir_read(struct path *realpath,
do {
rdd->count = 0;
rdd->err = 0;
- err = iterate_dir(realfile, &rdd->ctx);
+ err = iterate_dir(realfile, &rdd->ctx, true);
if (err >= 0)
err = rdd->err;
} while (!err && rdd->count);
@@ -722,7 +722,7 @@ static int ovl_iterate_real(struct file *file, struct dir_context *ctx)
return PTR_ERR(rdt.cache);
}
- err = iterate_dir(od->realfile, &rdt.ctx);
+ err = iterate_dir(od->realfile, &rdt.ctx, true);
ctx->pos = rdt.ctx.pos;
return err;
@@ -753,7 +753,7 @@ static int ovl_iterate(struct file *file, struct dir_context *ctx)
OVL_TYPE_MERGE(ovl_path_type(dentry->d_parent))))) {
err = ovl_iterate_real(file, ctx);
} else {
- err = iterate_dir(od->realfile, ctx);
+ err = iterate_dir(od->realfile, ctx, true);
}
goto out;
}
diff --git a/fs/readdir.c b/fs/readdir.c
index 09e8ed7d4161..8ea5b5f45a78 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -21,6 +21,7 @@
#include <linux/unistd.h>
#include <linux/compat.h>
#include <linux/uaccess.h>
+#include "internal.h"
#include <asm/unaligned.h>
@@ -36,8 +37,14 @@
unsafe_copy_to_user(dst, src, len, label); \
} while (0)
-
-int iterate_dir(struct file *file, struct dir_context *ctx)
+/**
+ * iterate_dir - iterate over directory
+ * @file : pointer to file struct of directory
+ * @ctx : pointer to directory ctx structure
+ * @use_fpos: true : use file offset
+ * false: use pos in ctx structure
+ */
+int iterate_dir(struct file *file, struct dir_context *ctx, bool use_fpos)
{
struct inode *inode = file_inode(file);
bool shared = false;
@@ -60,12 +67,17 @@ int iterate_dir(struct file *file, struct dir_context *ctx)
res = -ENOENT;
if (!IS_DEADDIR(inode)) {
- ctx->pos = file->f_pos;
+ if (use_fpos)
+ ctx->pos = file->f_pos;
+
if (shared)
res = file->f_op->iterate_shared(file, ctx);
else
res = file->f_op->iterate(file, ctx);
- file->f_pos = ctx->pos;
+
+ if (use_fpos)
+ file->f_pos = ctx->pos;
+
fsnotify_access(file);
file_accessed(file);
}
@@ -190,7 +202,7 @@ SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
if (!f.file)
return -EBADF;
- error = iterate_dir(f.file, &buf.ctx);
+ error = iterate_dir(f.file, &buf.ctx, true);
if (buf.result)
error = buf.result;
@@ -283,7 +295,7 @@ SYSCALL_DEFINE3(getdents, unsigned int, fd,
if (!f.file)
return -EBADF;
- error = iterate_dir(f.file, &buf.ctx);
+ error = iterate_dir(f.file, &buf.ctx, true);
if (error >= 0)
error = buf.error;
if (buf.prev_reclen) {
@@ -448,7 +460,7 @@ COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
if (!f.file)
return -EBADF;
- error = iterate_dir(f.file, &buf.ctx);
+ error = iterate_dir(f.file, &buf.ctx, true);
if (buf.result)
error = buf.result;
@@ -534,7 +546,7 @@ COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
if (!f.file)
return -EBADF;
- error = iterate_dir(f.file, &buf.ctx);
+ error = iterate_dir(f.file, &buf.ctx, true);
if (error >= 0)
error = buf.error;
if (buf.prev_reclen) {
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1cb616fc1105..ba4f49c4ac41 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3343,7 +3343,7 @@ const char *simple_get_link(struct dentry *, struct inode *,
struct delayed_call *);
extern const struct inode_operations simple_symlink_inode_operations;
-extern int iterate_dir(struct file *, struct dir_context *);
+extern int iterate_dir(struct file *file, struct dir_context *ctx, bool use_fpos);
int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
int flags);
--
2.30.2
