This patch introduces a proc entry to show the currently enrolled donation
files.
- "File path" indicates a file.
- "Status"
a. "Donated" means the file is registed in the donation list by
fadvise(offset, length, POSIX_FADV_NOREUSE)
b. "Evicted" means the donated pages were reclaimed.
- "Offset (kb)" and "Length (kb) show the registered donation range.
- "Cached pages (kb)" shows the amount of cached pages in the inode page cache.
For example,
Donation List
# of files : 2
File path Status Offset (kb)
Length (kb) Cached pages (kb)
---
/local/tmp/test2 Donated 0
1048576 2097152
/local/tmp/test Evicted 0
1048576 1048576
Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
---
v2: use inode_lock|unlock_shared
fs/f2fs/sysfs.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 64 insertions(+)
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 1ffaf9e74ce9..9f90d1878ec6 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -1769,6 +1769,68 @@ static int __maybe_unused disk_map_seq_show(struct
seq_file *seq,
return 0;
}
+static int __maybe_unused donation_list_seq_show(struct seq_file *seq,
+ void *offset)
+{
+ struct super_block *sb = seq->private;
+ struct f2fs_sb_info *sbi = F2FS_SB(sb);
+ struct inode *inode;
+ struct f2fs_inode_info *fi;
+ struct dentry *dentry;
+ char *buf, *path;
+ int i;
+
+ buf = f2fs_getname(sbi);
+ if (!buf)
+ return 0;
+
+ seq_printf(seq, "Donation List\n");
+ seq_printf(seq, " # of files : %u\n", sbi->donate_files);
+ seq_printf(seq, " %-50s %10s %15s %15s %20s\n",
+ "File path", "Status", "Offset (kb)",
+ "Length (kb)", "Cached pages (kb)");
+ seq_printf(seq, "---\n");
+
+ for (i = 0; i < sbi->donate_files; i++) {
+ spin_lock(&sbi->inode_lock[DONATE_INODE]);
+ if (list_empty(&sbi->inode_list[DONATE_INODE])) {
+ spin_unlock(&sbi->inode_lock[DONATE_INODE]);
+ break;
+ }
+ fi = list_first_entry(&sbi->inode_list[DONATE_INODE],
+ struct f2fs_inode_info, gdonate_list);
+ list_move_tail(&fi->gdonate_list,
&sbi->inode_list[DONATE_INODE]);
+ inode = igrab(&fi->vfs_inode);
+ spin_unlock(&sbi->inode_lock[DONATE_INODE]);
+
+ if (!inode)
+ continue;
+
+ inode_lock_shared(inode);
+
+ dentry = d_find_alias(inode);
+ if (!dentry) {
+ path = NULL;
+ } else {
+ path = dentry_path_raw(dentry, buf, PATH_MAX);
+ if (IS_ERR(path))
+ goto next;
+ }
+ seq_printf(seq, " %-50s %10s %15lu %15lu %20lu\n",
+ path ? path : "<unlinked>",
+ is_inode_flag_set(inode, FI_DONATE_FINISHED) ?
+ "Evicted" : "Donated",
+ fi->donate_start << (PAGE_SHIFT - 10),
+ (fi->donate_end + 1) << (PAGE_SHIFT - 10),
+ inode->i_mapping->nrpages << (PAGE_SHIFT - 10));
+next:
+ inode_unlock_shared(inode);
+ iput(inode);
+ }
+ f2fs_putname(buf);
+ return 0;
+}
+
#ifdef CONFIG_F2FS_FAULT_INJECTION
static int __maybe_unused inject_stats_seq_show(struct seq_file *seq,
void *offset)
@@ -1878,6 +1940,8 @@ int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
discard_plist_seq_show, sb);
proc_create_single_data("disk_map", 0444, sbi->s_proc,
disk_map_seq_show, sb);
+ proc_create_single_data("donation_list", 0444, sbi->s_proc,
+ donation_list_seq_show, sb);
#ifdef CONFIG_F2FS_FAULT_INJECTION
proc_create_single_data("inject_stats", 0444, sbi->s_proc,
inject_stats_seq_show, sb);
--
2.51.0.rc1.163.g2494970778-goog
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