diff options
| -rw-r--r-- | fs/ext4/ext4.h | 7 | ||||
| -rw-r--r-- | fs/ext4/file.c | 36 |
2 files changed, 42 insertions, 1 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 569f527..9e268c9 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -834,6 +834,12 @@ struct ext4_super_block { }; #ifdef __KERNEL__ + +/* + * Mount flags + */ +#define EXT4_MF_MNTDIR_SAMPLED 0x0001 + /* * fourth extended-fs super-block data in memory */ @@ -853,6 +859,7 @@ struct ext4_sb_info { struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ struct buffer_head **s_group_desc; unsigned int s_mount_opt; + unsigned int s_mount_flags; ext4_fsblk_t s_sb_block; uid_t s_resuid; gid_t s_resgid; diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 588af8c..3f1873f 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -21,6 +21,8 @@ #include <linux/time.h> #include <linux/fs.h> #include <linux/jbd2.h> +#include <linux/mount.h> +#include <linux/path.h> #include "ext4.h" #include "ext4_jbd2.h" #include "xattr.h" @@ -145,6 +147,38 @@ 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) +{ + 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 path path; + char buf[64], *cp; + + if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) && + !(sb->s_flags & MS_RDONLY))) { + 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->mnt_parent; + path.dentry = mnt->mnt_mountpoint; + path_get(&path); + cp = d_path(&path, buf, sizeof(buf)); + path_put(&path); + if (!IS_ERR(cp)) { + memcpy(sbi->s_es->s_last_mounted, cp, + sizeof(sbi->s_es->s_last_mounted)); + sb->s_dirt = 1; + } + } + return generic_file_open(inode, filp); +} + const struct file_operations ext4_file_operations = { .llseek = generic_file_llseek, .read = do_sync_read, @@ -156,7 +190,7 @@ const struct file_operations ext4_file_operations = { .compat_ioctl = ext4_compat_ioctl, #endif .mmap = ext4_file_mmap, - .open = generic_file_open, + .open = ext4_file_open, .release = ext4_release_file, .fsync = ext4_sync_file, .splice_read = generic_file_splice_read, |