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ext4: factor out helper ext4_sample_last_mounted()

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Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein 2018-05-13 22:44:23 -04:00 committed by Theodore Ts'o
parent 0c8e3fe35d
commit 833a950882
1 changed files with 46 additions and 36 deletions
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82
fs/ext4/file.c
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@ -381,50 +381,60 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
return 0;
}
static int ext4_file_open(struct inode * inode, struct file * filp)
static int ext4_sample_last_mounted(struct super_block *sb,
struct vfsmount *mnt)
{
struct super_block *sb = inode->i_sb;
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
struct vfsmount *mnt = filp->f_path.mnt;
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct path path;
char buf[64], *cp;
handle_t *handle;
int err;
if (likely(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED))
return 0;
if (sb_rdonly(sb))
return 0;
sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
/*
* Sample where the filesystem has been mounted and
* store it in the superblock for sysadmin convenience
* when trying to sort through large numbers of block
* devices or filesystem images.
*/
memset(buf, 0, sizeof(buf));
path.mnt = mnt;
path.dentry = mnt->mnt_root;
cp = d_path(&path, buf, sizeof(buf));
if (IS_ERR(cp))
return 0;
handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
if (IS_ERR(handle))
return PTR_ERR(handle);
BUFFER_TRACE(sbi->s_sbh, "get_write_access");
err = ext4_journal_get_write_access(handle, sbi->s_sbh);
if (err)
goto out;
strlcpy(sbi->s_es->s_last_mounted, cp,
sizeof(sbi->s_es->s_last_mounted));
ext4_handle_dirty_super(handle, sb);
out:
ext4_journal_stop(handle);
return err;
}
static int ext4_file_open(struct inode * inode, struct file * filp)
{
int ret;
if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
return -EIO;
if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
!sb_rdonly(sb))) {
sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
/*
* Sample where the filesystem has been mounted and
* store it in the superblock for sysadmin convenience
* when trying to sort through large numbers of block
* devices or filesystem images.
*/
memset(buf, 0, sizeof(buf));
path.mnt = mnt;
path.dentry = mnt->mnt_root;
cp = d_path(&path, buf, sizeof(buf));
if (!IS_ERR(cp)) {
handle_t *handle;
int err;
handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
if (IS_ERR(handle))
return PTR_ERR(handle);
BUFFER_TRACE(sbi->s_sbh, "get_write_access");
err = ext4_journal_get_write_access(handle, sbi->s_sbh);
if (err) {
ext4_journal_stop(handle);
return err;
}
strlcpy(sbi->s_es->s_last_mounted, cp,
sizeof(sbi->s_es->s_last_mounted));
ext4_handle_dirty_super(handle, sb);
ext4_journal_stop(handle);
}
}
ret = ext4_sample_last_mounted(inode->i_sb, filp->f_path.mnt);
if (ret)
return ret;
ret = fscrypt_file_open(inode, filp);
if (ret)