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Message-ID:
<170820142741.6328.12428356024575347885.stgit@91.116.238.104.host.secureserver.net>
Date: Sat, 17 Feb 2024 15:23:47 -0500
From: Chuck Lever <cel@...nel.org>
To: viro@...iv.linux.org.uk, brauner@...nel.org, jack@...e.cz,
hughd@...gle.com, akpm@...ux-foundation.org, Liam.Howlett@...cle.com,
oliver.sang@...el.com, feng.tang@...el.com
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
maple-tree@...ts.infradead.org, linux-mm@...ck.org, lkp@...el.com
Subject: [PATCH v2 2/6] libfs: Define a minimum directory offset
From: Chuck Lever <chuck.lever@...cle.com>
This value is used in several places, so make it a symbolic
constant.
Reviewed-by: Jan Kara <jack@...e.cz>
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
---
fs/libfs.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/fs/libfs.c b/fs/libfs.c
index 752e24c669d9..f0045db739df 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -240,6 +240,11 @@ const struct inode_operations simple_dir_inode_operations = {
};
EXPORT_SYMBOL(simple_dir_inode_operations);
+/* 0 is '.', 1 is '..', so always start with offset 2 or more */
+enum {
+ DIR_OFFSET_MIN = 2,
+};
+
static void offset_set(struct dentry *dentry, u32 offset)
{
dentry->d_fsdata = (void *)((uintptr_t)(offset));
@@ -261,9 +266,7 @@ void simple_offset_init(struct offset_ctx *octx)
{
xa_init_flags(&octx->xa, XA_FLAGS_ALLOC1);
lockdep_set_class(&octx->xa.xa_lock, &simple_offset_xa_lock);
-
- /* 0 is '.', 1 is '..', so always start with offset 2 */
- octx->next_offset = 2;
+ octx->next_offset = DIR_OFFSET_MIN;
}
/**
@@ -276,7 +279,7 @@ void simple_offset_init(struct offset_ctx *octx)
*/
int simple_offset_add(struct offset_ctx *octx, struct dentry *dentry)
{
- static const struct xa_limit limit = XA_LIMIT(2, U32_MAX);
+ static const struct xa_limit limit = XA_LIMIT(DIR_OFFSET_MIN, U32_MAX);
u32 offset;
int ret;
@@ -481,7 +484,7 @@ static int offset_readdir(struct file *file, struct dir_context *ctx)
return 0;
/* In this case, ->private_data is protected by f_pos_lock */
- if (ctx->pos == 2)
+ if (ctx->pos == DIR_OFFSET_MIN)
file->private_data = NULL;
else if (file->private_data == ERR_PTR(-ENOENT))
return 0;
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