Signed-off-by: Yongpeng Yang <[email protected]>
---
fs/f2fs/extent_cache.c | 70 +++++++++++++++++++++++++++++++++++++++
fs/f2fs/f2fs.h | 3 ++
fs/f2fs/file.c | 11 ++++++
include/uapi/linux/f2fs.h | 21 ++++++++++++
4 files changed, 105 insertions(+)
diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
index e141ffb64e5f..0c10d5639d68 100644
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -14,6 +14,7 @@
#include <linux/fs.h>
#include <linux/f2fs_fs.h>
+#include <uapi/linux/f2fs.h>
#include "f2fs.h"
#include "node.h"
@@ -1267,6 +1268,75 @@ static void __init_extent_tree_info(struct
extent_tree_info *eti)
atomic_set(&eti->total_ext_node, 0);
}
+int f2fs_get_read_cache_extents(struct inode *inode,
+ struct f2fs_read_cache_extent __user *uarg)
+{
+ struct extent_tree *et = F2FS_I(inode)->extent_tree[EX_READ];
+ struct f2fs_cache_extent_info *kbuf = NULL;
+ struct f2fs_cache_extent_info largest = {};
+ struct rb_node *node;
+ struct extent_node *en;
+ unsigned int capacity, count = 0;
+ __u32 flags = 0;
+ int ret = 0;
+
+ if (get_user(capacity, &uarg->ext_count))
+ return -EFAULT;
+
+ if (is_inode_flag_set(inode, FI_NO_EXTENT))
+ flags |= F2FS_EXT_FL_NO_EXTENT;
+
+ if (!et || (flags & F2FS_EXT_FL_NO_EXTENT)) {
+ if (put_user(0U, &uarg->ext_count) ||
+ put_user(flags, &uarg->flags) ||
+ put_user(0U, &uarg->node_count))
+ return -EFAULT;
+ return 0;
+ }
+
+ if (capacity) {
+ kbuf = f2fs_kvmalloc(F2FS_I_SB(inode), capacity *
sizeof(*kbuf), GFP_KERNEL);
+ if (!kbuf)
+ return -ENOMEM;
+ }
+
+ read_lock(&et->lock);
+
+ largest.fofs = et->largest.fofs;
+ largest.blk = et->largest.blk;
+ largest.len = et->largest.len;
+ largest.last_access_mode = et->largest.last_access_mode;
+
+ for (node = rb_first_cached(&et->root); node; node = rb_next(node)) {
+ if (count >= capacity)
+ break;
+ en = rb_entry(node, struct extent_node, rb_node);
+
+ kbuf[count].fofs = en->ei.fofs;
+ kbuf[count].blk = en->ei.blk;
+ kbuf[count].len = en->ei.len;
+ kbuf[count].last_access_mode = en->ei.last_access_mode;
+ count++;
+ }
+
+ read_unlock(&et->lock);
+
+ if (count && copy_to_user(uarg->extents, kbuf,
+ count * sizeof(*kbuf))) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ if (put_user(count, &uarg->ext_count) ||
+ put_user(flags, &uarg->flags) ||
+ put_user((u32)atomic_read(&et->node_cnt), &uarg->node_count) ||
+ copy_to_user(&uarg->largest, &largest, sizeof(largest)))
+ ret = -EFAULT;
+out:
+ kvfree(kbuf);
+ return ret;
+}
+
void f2fs_init_extent_cache_info(struct f2fs_sb_info *sbi)
{
__init_extent_tree_info(&sbi->extent_tree[EX_READ]);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 1588b64d04a3..69641fc31c51 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -26,6 +26,7 @@
#include <linux/part_stat.h>
#include <linux/rw_hint.h>
+#include <uapi/linux/f2fs.h>
#include <linux/fscrypt.h>
#include <linux/fsverity.h>
@@ -4590,6 +4591,8 @@ void f2fs_update_read_extent_cache(struct dnode_of_data *dn);
void f2fs_update_read_extent_cache_range(struct dnode_of_data *dn,
pgoff_t fofs, block_t blkaddr, unsigned int len,
enum extent_access_mode access_mode);
+int f2fs_get_read_cache_extents(struct inode *inode,
+ struct f2fs_read_cache_extent __user *uarg);
unsigned int f2fs_shrink_read_extent_tree(struct f2fs_sb_info *sbi,
int nr_shrink);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index a3a5d499eadf..66ec9927d667 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3672,6 +3672,14 @@ static int f2fs_ioc_precache_extents(struct file *filp)
return f2fs_precache_extents(file_inode(filp));
}
+static int f2fs_ioc_get_read_cache_extents(struct file *filp, unsigned long arg)
+{
+ struct inode *inode = file_inode(filp);
+
+ return f2fs_get_read_cache_extents(inode,
+ (struct f2fs_read_cache_extent __user *)arg);
+}
+
static int f2fs_ioc_resize_fs(struct file *filp, unsigned long arg)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(file_inode(filp));
@@ -4744,6 +4752,8 @@ static long __f2fs_ioctl(struct file *filp, unsigned int
cmd, unsigned long arg)
return f2fs_ioc_get_dev_alias_file(filp, arg);
case F2FS_IOC_IO_PRIO:
return f2fs_ioc_io_prio(filp, arg);
+ case F2FS_IOC_GET_READ_CACHE_EXTENTS:
+ return f2fs_ioc_get_read_cache_extents(filp, arg);
default:
return -ENOTTY;
}
@@ -5506,6 +5516,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int
cmd, unsigned long arg)
case F2FS_IOC_COMPRESS_FILE:
case F2FS_IOC_GET_DEV_ALIAS_FILE:
case F2FS_IOC_IO_PRIO:
+ case F2FS_IOC_GET_READ_CACHE_EXTENTS:
break;
default:
return -ENOIOCTLCMD;
diff --git a/include/uapi/linux/f2fs.h b/include/uapi/linux/f2fs.h
index 795e26258355..6ff9003bc030 100644
--- a/include/uapi/linux/f2fs.h
+++ b/include/uapi/linux/f2fs.h
@@ -45,6 +45,8 @@
#define F2FS_IOC_START_ATOMIC_REPLACE _IO(F2FS_IOCTL_MAGIC, 25)
#define F2FS_IOC_GET_DEV_ALIAS_FILE _IOR(F2FS_IOCTL_MAGIC, 26, __u32)
#define F2FS_IOC_IO_PRIO _IOW(F2FS_IOCTL_MAGIC, 27, __u32)
+#define F2FS_IOC_GET_READ_CACHE_EXTENTS _IOWR(F2FS_IOCTL_MAGIC, 28,
\
+ struct f2fs_read_cache_extent)
/*
* should be same as XFS_IOC_GOINGDOWN.
@@ -104,4 +106,23 @@ struct f2fs_comp_option {
__u8 log_cluster_size;
};
+struct f2fs_cache_extent_info {
+ __u32 fofs; /* start file offset in blocks */
+ __u32 blk; /* start block address */
+ __u32 len; /* length in blocks */
+ __u32 last_access_mode; /* last access mode of extent_node */
+};
+
+/* flags for f2fs_read_cache_extent */
+#define F2FS_EXT_FL_NO_EXTENT 0x1 /* extent cache disabled for this inode
*/
+
+struct f2fs_read_cache_extent {
+ __u32 ext_count; /* in: array capacity; out: mapped extent count
*/
+ __u32 flags; /* out: status flags */
+ __u32 node_count; /* out: total extent nodes in tree */
+ __u32 reserved;
+ struct f2fs_cache_extent_info largest; /* out: largest extent
*/
+ struct f2fs_cache_extent_info extents[]; /* out: extent array */
+};
+
#endif /* _UAPI_LINUX_F2FS_H */
