From: Ye Bin <yebin10@xxxxxxxxxx>
This patch introduce I_CURSOR flag for inode and introduce
sb_for_each_inodes_safe/sb_for_each_inodes/sb_for_each_inodes_continue_safe
API for foreach super_block->s_inodes.
Signed-off-by: Ye Bin <yebin10@xxxxxxxxxx>
---
include/linux/fs.h | 45 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0a152c31d1bf..cf2734e0b2cd 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2473,6 +2473,7 @@ static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
#define I_DONTCACHE (1 << 15)
#define I_SYNC_QUEUED (1 << 16)
#define I_PINNING_NETFS_WB (1 << 17)
+#define I_CURSOR (1 << 18)
#define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC)
#define I_DIRTY (I_DIRTY_INODE | I_DIRTY_PAGES)
@@ -3809,4 +3810,48 @@ static inline bool vfs_empty_path(int dfd, const char __user *path)
int generic_atomic_write_valid(struct kiocb *iocb, struct iov_iter *iter);
+static inline bool inode_is_cursor(struct inode *inode)
+{
+ return inode->i_state & I_CURSOR;
+}
+
+static inline struct inode *next_sb_inode(struct inode *pos,
+ struct list_head *head)
+{
+ struct inode *inode;
+ struct list_head *start;
+
+ if (!pos)
+ return NULL;
+
+ start = &pos->i_sb_list;
+
+ list_for_each_continue(start, head) {
+ inode = list_entry(start, typeof(*inode), i_sb_list);
+ if (likely(!inode_is_cursor(inode)))
+ return inode;
+ }
+
+ return NULL;
+}
+
+#define sb_for_each_inodes_safe(pos, n, head) \
+ for (pos = list_entry(head, typeof(*pos), i_sb_list), \
+ pos = next_sb_inode(pos, head), \
+ n = next_sb_inode(pos, head); \
+ pos != NULL; \
+ pos = n, n = next_sb_inode(n, head))
+
+#define sb_for_each_inodes(pos, head) \
+ for (pos = list_entry(head, typeof(*pos), i_sb_list), \
+ pos = next_sb_inode(pos, head); \
+ pos != NULL; \
+ pos = next_sb_inode(pos, head))
+
+#define sb_for_each_inodes_continue_safe(pos, n, head) \
+ for (pos = next_sb_inode(pos, head), \
+ n = next_sb_inode(pos, head); \
+ pos != NULL; \
+ pos = n, n = next_sb_inode(n, head))
+
#endif /* _LINUX_FS_H */
--
2.34.1
