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Commit feaf77d5 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2 

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2:
  nilfs2: add reader's lock for cno in nilfs_ioctl_sync
  nilfs2: delete unnecessary condition in load_segment_summary
  nilfs2: move iterator to write log into segment buffer
  nilfs2: get rid of s_dirt flag use
  nilfs2: get rid of nilfs_segctor_req struct
  nilfs2: delete unnecessary condition in nilfs_dat_translate
  nilfs2: fix potential hang in nilfs_error on errors=remount-ro
  nilfs2: use mnt_want_write in ioctls where write access is needed
  nilfs2: issue discard request after cleaning segments
parents eca281aa 0d561f12

Documentation/filesystems/nilfs2.txt

+3 −0
Original line number Diff line number Diff line
@@ -74,6 +74,9 @@ norecovery Disable recovery of the filesystem on mount. 
			This disables every write access on the device for

			read-only mounts or snapshots.  This option will fail

			for r/w mounts on an unclean volume.

discard			Issue discard/TRIM commands to the underlying block

			device when blocks are freed.  This is useful for SSD

			devices and sparse/thinly-provisioned LUNs.



NILFS2 usage

============

fs/nilfs2/dat.c

+1 −2
Original line number Diff line number Diff line
@@ -388,7 +388,6 @@ int nilfs_dat_translate(struct inode *dat, __u64 vblocknr, sector_t *blocknrp) 
		ret = -ENOENT;

		goto out;

	}

	if (blocknrp != NULL)

	*blocknrp = blocknr;



 out:

fs/nilfs2/ioctl.c

+48 −18
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <linux/capability.h>	/* capable() */

#include <linux/uaccess.h>	/* copy_from_user(), copy_to_user() */

#include <linux/vmalloc.h>

#include <linux/mount.h>	/* mnt_want_write(), mnt_drop_write() */

#include <linux/nilfs2_fs.h>

#include "nilfs.h"

#include "segment.h"
@@ -107,20 +108,28 @@ static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp, 


	if (!capable(CAP_SYS_ADMIN))

		return -EPERM;



	ret = mnt_want_write(filp->f_path.mnt);

	if (ret)

		return ret;



	ret = -EFAULT;

	if (copy_from_user(&cpmode, argp, sizeof(cpmode)))

		return -EFAULT;

		goto out;



	mutex_lock(&nilfs->ns_mount_mutex);



	nilfs_transaction_begin(inode->i_sb, &ti, 0);

	ret = nilfs_cpfile_change_cpmode(

		cpfile, cpmode.cm_cno, cpmode.cm_mode);

	if (unlikely(ret < 0)) {

	if (unlikely(ret < 0))

		nilfs_transaction_abort(inode->i_sb);

		mutex_unlock(&nilfs->ns_mount_mutex);

		return ret;

	}

	else

		nilfs_transaction_commit(inode->i_sb); /* never fails */



	mutex_unlock(&nilfs->ns_mount_mutex);

out:

	mnt_drop_write(filp->f_path.mnt);

	return ret;

}
@@ -135,16 +144,23 @@ nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp, 


	if (!capable(CAP_SYS_ADMIN))

		return -EPERM;



	ret = mnt_want_write(filp->f_path.mnt);

	if (ret)

		return ret;



	ret = -EFAULT;

	if (copy_from_user(&cno, argp, sizeof(cno)))

		return -EFAULT;

		goto out;



	nilfs_transaction_begin(inode->i_sb, &ti, 0);

	ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);

	if (unlikely(ret < 0)) {

	if (unlikely(ret < 0))

		nilfs_transaction_abort(inode->i_sb);

		return ret;

	}

	else

		nilfs_transaction_commit(inode->i_sb); /* never fails */

out:

	mnt_drop_write(filp->f_path.mnt);

	return ret;

}
@@ -496,12 +512,19 @@ static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp, 
	if (!capable(CAP_SYS_ADMIN))

		return -EPERM;



	ret = mnt_want_write(filp->f_path.mnt);

	if (ret)

		return ret;



	ret = -EFAULT;

	if (copy_from_user(argv, argp, sizeof(argv)))

		return -EFAULT;

		goto out;



	ret = -EINVAL;

	nsegs = argv[4].v_nmembs;

	if (argv[4].v_size != argsz[4])

		return -EINVAL;

		goto out;



	/*

	 * argv[4] points to segment numbers this ioctl cleans.  We

	 * use kmalloc() for its buffer because memory used for the
@@ -509,9 +532,10 @@ static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp, 
	 */

	kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,

			       nsegs * sizeof(__u64));

	if (IS_ERR(kbufs[4]))

		return PTR_ERR(kbufs[4]);



	if (IS_ERR(kbufs[4])) {

		ret = PTR_ERR(kbufs[4]);

		goto out;

	}

	nilfs = NILFS_SB(inode->i_sb)->s_nilfs;



	for (n = 0; n < 4; n++) {
@@ -567,6 +591,8 @@ static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp, 
	while (--n >= 0)

		vfree(kbufs[n]);

	kfree(kbufs[4]);

out:

	mnt_drop_write(filp->f_path.mnt);

	return ret;

}
@@ -575,13 +601,17 @@ static int nilfs_ioctl_sync(struct inode *inode, struct file *filp, 
{

	__u64 cno;

	int ret;

	struct the_nilfs *nilfs;



	ret = nilfs_construct_segment(inode->i_sb);

	if (ret < 0)

		return ret;



	if (argp != NULL) {

		cno = NILFS_SB(inode->i_sb)->s_nilfs->ns_cno - 1;

		nilfs = NILFS_SB(inode->i_sb)->s_nilfs;

		down_read(&nilfs->ns_segctor_sem);

		cno = nilfs->ns_cno - 1;

		up_read(&nilfs->ns_segctor_sem);

		if (copy_to_user(argp, &cno, sizeof(cno)))

			return -EFAULT;

	}

fs/nilfs2/recovery.c

+11 −30
Original line number Diff line number Diff line
@@ -39,7 +39,6 @@ enum { 
	NILFS_SEG_FAIL_IO,

	NILFS_SEG_FAIL_MAGIC,

	NILFS_SEG_FAIL_SEQ,

	NILFS_SEG_FAIL_CHECKSUM_SEGSUM,

	NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT,

	NILFS_SEG_FAIL_CHECKSUM_FULL,

	NILFS_SEG_FAIL_CONSISTENCY,
@@ -71,10 +70,6 @@ static int nilfs_warn_segment_error(int err) 
		printk(KERN_WARNING

		       "NILFS warning: Sequence number mismatch\n");

		break;

	case NILFS_SEG_FAIL_CHECKSUM_SEGSUM:

		printk(KERN_WARNING

		       "NILFS warning: Checksum error in segment summary\n");

		break;

	case NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT:

		printk(KERN_WARNING

		       "NILFS warning: Checksum error in super root\n");
@@ -206,19 +201,15 @@ int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block, 
 * @pseg_start: start disk block number of partial segment

 * @seg_seq: sequence number requested

 * @ssi: pointer to nilfs_segsum_info struct to store information

 * @full_check: full check flag

 *              (0: only checks segment summary CRC, 1: data CRC)

 */

static int

load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start,

		     u64 seg_seq, struct nilfs_segsum_info *ssi,

		     int full_check)

		     u64 seg_seq, struct nilfs_segsum_info *ssi)

{

	struct buffer_head *bh_sum;

	struct nilfs_segment_summary *sum;

	unsigned long offset, nblock;

	u64 check_bytes;

	u32 crc, crc_sum;

	unsigned long nblock;

	u32 crc;

	int ret = NILFS_SEG_FAIL_IO;



	bh_sum = sb_bread(sbi->s_super, pseg_start);
@@ -237,34 +228,24 @@ load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start, 
		ret = NILFS_SEG_FAIL_SEQ;

		goto failed;

	}

	if (full_check) {

		offset = sizeof(sum->ss_datasum);

		check_bytes =

			((u64)ssi->nblocks << sbi->s_super->s_blocksize_bits);

		nblock = ssi->nblocks;

		crc_sum = le32_to_cpu(sum->ss_datasum);

		ret = NILFS_SEG_FAIL_CHECKSUM_FULL;

	} else { /* only checks segment summary */

		offset = sizeof(sum->ss_datasum) + sizeof(sum->ss_sumsum);

		check_bytes = ssi->sumbytes;

		nblock = ssi->nsumblk;

		crc_sum = le32_to_cpu(sum->ss_sumsum);

		ret = NILFS_SEG_FAIL_CHECKSUM_SEGSUM;

	}



	nblock = ssi->nblocks;

	if (unlikely(nblock == 0 ||

		     nblock > sbi->s_nilfs->ns_blocks_per_segment)) {

		/* This limits the number of blocks read in the CRC check */

		ret = NILFS_SEG_FAIL_CONSISTENCY;

		goto failed;

	}

	if (calc_crc_cont(sbi, bh_sum, &crc, offset, check_bytes,

	if (calc_crc_cont(sbi, bh_sum, &crc, sizeof(sum->ss_datasum),

			  ((u64)nblock << sbi->s_super->s_blocksize_bits),

			  pseg_start, nblock)) {

		ret = NILFS_SEG_FAIL_IO;

		goto failed;

	}

	if (crc == crc_sum)

	if (crc == le32_to_cpu(sum->ss_datasum))

		ret = 0;

	else

		ret = NILFS_SEG_FAIL_CHECKSUM_FULL;

 failed:

	brelse(bh_sum);

 out:
@@ -598,7 +579,7 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs, 


	while (segnum != ri->ri_segnum || pseg_start <= ri->ri_pseg_start) {



		ret = load_segment_summary(sbi, pseg_start, seg_seq, &ssi, 1);

		ret = load_segment_summary(sbi, pseg_start, seg_seq, &ssi);

		if (ret) {

			if (ret == NILFS_SEG_FAIL_IO) {

				err = -EIO;
@@ -821,7 +802,7 @@ int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, 


	for (;;) {

		/* Load segment summary */

		ret = load_segment_summary(sbi, pseg_start, seg_seq, &ssi, 1);

		ret = load_segment_summary(sbi, pseg_start, seg_seq, &ssi);

		if (ret) {

			if (ret == NILFS_SEG_FAIL_IO)

				goto failed;

fs/nilfs2/segbuf.c

+18 −0
Original line number Diff line number Diff line
@@ -40,6 +40,11 @@ struct nilfs_write_info { 
};





static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,

			      struct the_nilfs *nilfs);

static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf);





static struct kmem_cache *nilfs_segbuf_cachep;



static void nilfs_segbuf_init_once(void *obj)
@@ -302,6 +307,19 @@ void nilfs_truncate_logs(struct list_head *logs, 
	}

}



int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs)

{

	struct nilfs_segment_buffer *segbuf;

	int ret = 0;



	list_for_each_entry(segbuf, logs, sb_list) {

		ret = nilfs_segbuf_write(segbuf, nilfs);

		if (ret)

			break;

	}

	return ret;

}



int nilfs_wait_on_logs(struct list_head *logs)

{

	struct nilfs_segment_buffer *segbuf;