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Message-ID: <alpine.DEB.2.00.1505021011010.3969@leontynka>
Date: Sat, 2 May 2015 10:14:12 +0200 (CEST)
From: Mikulas Patocka <mikulas@...bright.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH] Support fstrim on HPFS
This patch adds support for fstrim command to the HPFS filesystem.
Signed-off-by: Mikulas Patocka <mikulas@...bright.com>
---
fs/hpfs/alloc.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/hpfs/dir.c | 4 ++
fs/hpfs/file.c | 4 ++
fs/hpfs/hpfs_fn.h | 7 +++
fs/hpfs/super.c | 35 +++++++++++++++++++
5 files changed, 145 insertions(+)
Index: linux-4.1-rc1/fs/hpfs/dir.c
===================================================================
--- linux-4.1-rc1.orig/fs/hpfs/dir.c 2014-07-01 18:49:25.000000000 +0200
+++ linux-4.1-rc1/fs/hpfs/dir.c 2015-05-01 15:52:29.000000000 +0200
@@ -327,4 +327,8 @@ const struct file_operations hpfs_dir_op
.iterate = hpfs_readdir,
.release = hpfs_dir_release,
.fsync = hpfs_file_fsync,
+ .unlocked_ioctl = hpfs_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = hpfs_compat_ioctl,
+#endif
};
Index: linux-4.1-rc1/fs/hpfs/file.c
===================================================================
--- linux-4.1-rc1.orig/fs/hpfs/file.c 2015-05-01 12:31:01.000000000 +0200
+++ linux-4.1-rc1/fs/hpfs/file.c 2015-05-01 15:52:29.000000000 +0200
@@ -203,6 +203,10 @@ const struct file_operations hpfs_file_o
.release = hpfs_file_release,
.fsync = hpfs_file_fsync,
.splice_read = generic_file_splice_read,
+ .unlocked_ioctl = hpfs_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = hpfs_compat_ioctl,
+#endif
};
const struct inode_operations hpfs_file_iops =
Index: linux-4.1-rc1/fs/hpfs/alloc.c
===================================================================
--- linux-4.1-rc1.orig/fs/hpfs/alloc.c 2014-07-01 18:49:25.000000000 +0200
+++ linux-4.1-rc1/fs/hpfs/alloc.c 2015-05-01 15:52:29.000000000 +0200
@@ -484,3 +484,98 @@ struct anode *hpfs_alloc_anode(struct su
a->btree.first_free = cpu_to_le16(8);
return a;
}
+
+static unsigned find_run(__le32 *bmp, unsigned *idx)
+{
+ unsigned len;
+ while (tstbits(bmp, *idx, 1)) {
+ (*idx)++;
+ if (unlikely(*idx >= 0x4000))
+ return 0;
+ }
+ len = 1;
+ while (!tstbits(bmp, *idx + len, 1))
+ len++;
+ return len;
+}
+
+static int do_trim(struct super_block *s, secno start, unsigned len, secno limit_start, secno limit_end, unsigned minlen, unsigned *result)
+{
+ int err;
+ secno end;
+ if (fatal_signal_pending(current))
+ return -EINTR;
+ end = start + len;
+ if (start < limit_start)
+ start = limit_start;
+ if (end > limit_end)
+ end = limit_end;
+ if (start >= end)
+ return 0;
+ if (end - start < minlen)
+ return 0;
+ err = sb_issue_discard(s, start, end - start, GFP_NOFS, 0);
+ if (err)
+ return err;
+ *result += end - start;
+ return 0;
+}
+
+int hpfs_trim_fs(struct super_block *s, u64 start, u64 end, u64 minlen, unsigned *result)
+{
+ int err = 0;
+ struct hpfs_sb_info *sbi = hpfs_sb(s);
+ unsigned idx, len, start_bmp, end_bmp;
+ __le32 *bmp;
+ struct quad_buffer_head qbh;
+
+ *result = 0;
+ if (!end || end > sbi->sb_fs_size)
+ end = sbi->sb_fs_size;
+ if (start >= sbi->sb_fs_size)
+ return 0;
+ if (minlen > 0x4000)
+ return 0;
+ if (start < sbi->sb_dirband_start + sbi->sb_dirband_size && end > sbi->sb_dirband_start) {
+ hpfs_lock(s);
+ if (s->s_flags & MS_RDONLY) {
+ err = -EROFS;
+ goto unlock_1;
+ }
+ if (!(bmp = hpfs_map_dnode_bitmap(s, &qbh))) {
+ err = -EIO;
+ goto unlock_1;
+ }
+ idx = 0;
+ while ((len = find_run(bmp, &idx)) && !err) {
+ err = do_trim(s, sbi->sb_dirband_start + idx * 4, len * 4, start, end, minlen, result);
+ idx += len;
+ }
+ hpfs_brelse4(&qbh);
+unlock_1:
+ hpfs_unlock(s);
+ }
+ start_bmp = start >> 14;
+ end_bmp = (end + 0x3fff) >> 14;
+ while (start_bmp < end_bmp && !err) {
+ hpfs_lock(s);
+ if (s->s_flags & MS_RDONLY) {
+ err = -EROFS;
+ goto unlock_2;
+ }
+ if (!(bmp = hpfs_map_bitmap(s, start_bmp, &qbh, "trim"))) {
+ err = -EIO;
+ goto unlock_2;
+ }
+ idx = 0;
+ while ((len = find_run(bmp, &idx)) && !err) {
+ err = do_trim(s, (start_bmp << 14) + idx, len, start, end, minlen, result);
+ idx += len;
+ }
+ hpfs_brelse4(&qbh);
+unlock_2:
+ hpfs_unlock(s);
+ start_bmp++;
+ }
+ return err;
+}
Index: linux-4.1-rc1/fs/hpfs/hpfs_fn.h
===================================================================
--- linux-4.1-rc1.orig/fs/hpfs/hpfs_fn.h 2014-07-01 18:49:25.000000000 +0200
+++ linux-4.1-rc1/fs/hpfs/hpfs_fn.h 2015-05-01 15:52:29.000000000 +0200
@@ -18,6 +18,8 @@
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/blkdev.h>
#include <asm/unaligned.h>
#include "hpfs.h"
@@ -200,6 +202,7 @@ void hpfs_free_dnode(struct super_block
struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *);
struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
+int hpfs_trim_fs(struct super_block *, u64, u64, u64, unsigned *);
/* anode.c */
@@ -318,6 +321,10 @@ __printf(2, 3)
void hpfs_error(struct super_block *, const char *, ...);
int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
unsigned hpfs_get_free_dnodes(struct super_block *);
+long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg);
+#ifdef CONFIG_COMPAT
+long hpfs_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg);
+#endif
/*
* local time (HPFS) to GMT (Unix)
Index: linux-4.1-rc1/fs/hpfs/super.c
===================================================================
--- linux-4.1-rc1.orig/fs/hpfs/super.c 2015-05-01 12:58:39.000000000 +0200
+++ linux-4.1-rc1/fs/hpfs/super.c 2015-05-01 16:02:53.000000000 +0200
@@ -15,6 +15,7 @@
#include <linux/sched.h>
#include <linux/bitmap.h>
#include <linux/slab.h>
+#include <linux/compat.h>
/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
@@ -198,6 +199,40 @@ static int hpfs_statfs(struct dentry *de
return 0;
}
+
+long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case FITRIM: {
+ struct fstrim_range range;
+ secno n_trimmed;
+ int r;
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
+ return -EFAULT;
+ r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed);
+ if (r)
+ return r;
+ range.len = (u64)n_trimmed << 9;
+ if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
+ return -EFAULT;
+ return 0;
+ }
+ default: {
+ return -ENOIOCTLCMD;
+ }
+ }
+}
+
+#ifdef CONFIG_COMPAT
+long hpfs_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
+{
+ return hpfs_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
+
static struct kmem_cache * hpfs_inode_cachep;
static struct inode *hpfs_alloc_inode(struct super_block *sb)
--
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