提交 a27b5b97 编写于 作者: M Mikulas Patocka 提交者: Linus Torvalds

hpfs: add fstrim support

This patch adds support for fstrim to the HPFS filesystem.
Signed-off-by: NMikulas Patocka <mikulas@twibright.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 9abea2d6
......@@ -484,3 +484,98 @@ struct anode *hpfs_alloc_anode(struct super_block *s, secno near, anode_secno *a
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;
}
......@@ -327,4 +327,5 @@ const struct file_operations hpfs_dir_ops =
.iterate = hpfs_readdir,
.release = hpfs_dir_release,
.fsync = hpfs_file_fsync,
.unlocked_ioctl = hpfs_ioctl,
};
......@@ -203,6 +203,7 @@ const struct file_operations hpfs_file_ops =
.release = hpfs_file_release,
.fsync = hpfs_file_fsync,
.splice_read = generic_file_splice_read,
.unlocked_ioctl = hpfs_ioctl,
};
const struct inode_operations hpfs_file_iops =
......
......@@ -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 *, secno);
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 +321,7 @@ __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);
/*
* local time (HPFS) to GMT (Unix)
......
......@@ -196,6 +196,33 @@ static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
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;
}
}
}
static struct kmem_cache * hpfs_inode_cachep;
static struct inode *hpfs_alloc_inode(struct super_block *sb)
......
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