=================UBIFS_ATIME_SUPPORT=n=======================
-o - no atime
-o atime - no atime
-o noatime - no atime
-o relatime - no atime
-o strictatime - no atime
-o lazyatime - no atime
With UBIFS_ATIME_SUPPORT=y:
ubifs supports the atime same with other main stream
file systems.
=================UBIFS_ATIME_SUPPORT=y=======================
-o - default behavior (relatime currently)
-o atime - atime support
-o noatime - no atime support
-o relatime - relative atime support
-o strictatime - strict atime support
-o lazyatime - lazy atime support
Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
---
-v2:
implement update_time for ubifs
-v3:
Oops, forgot to assign update_time for
ubifs_dir_inode_operations.
-v4:
drop the patch to change 'Y' to 'N' in
Kconfig
fs/ubifs/Kconfig | 11 +++++++++++
fs/ubifs/dir.c | 3 +++
fs/ubifs/file.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
fs/ubifs/super.c | 19 ++++++++++++++++---
fs/ubifs/ubifs.h | 1 +
5 files changed, 81 insertions(+), 3 deletions(-)
@@ -35,3 +35,14 @@ config UBIFS_FS_ZLIB
default y
help
Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
+
+config UBIFS_ATIME_SUPPORT
+ bool "Access time support" if UBIFS_FS
+ depends on UBIFS_FS
+ default n
+ help
+ This option allows ubifs to support atime. -o strictatime is harmful to
+ your flash, we don't suggest it. But relatime and lazytime are much
+ better.
+
+ If unsure, say 'N'
@@ -1187,6 +1187,9 @@ const struct inode_operations ubifs_dir_inode_operations = {
.getxattr = ubifs_getxattr,
.listxattr = ubifs_listxattr,
.removexattr = ubifs_removexattr,
+#ifdef CONFIG_UBIFS_ATIME_SUPPORT
+ .update_time = ubifs_update_time,
+#endif
};
const struct file_operations ubifs_dir_operations = {
@@ -1364,6 +1364,47 @@ static inline int mctime_update_needed(const struct inode *inode,
}
/**
+ * ubifs_update_time - update time of inode.
+ * @inode: inode to update
+ *
+ * This function updates time of the inode.
+ */
+int ubifs_update_time(struct inode *inode, struct timespec *time,
+ int flags)
+{
+ struct ubifs_inode *ui = ubifs_inode(inode);
+ struct ubifs_info *c = inode->i_sb->s_fs_info;
+ struct ubifs_budget_req req = { .dirtied_ino = 1,
+ .dirtied_ino_d = ALIGN(ui->data_len, 8) };
+ int iflags = I_DIRTY_TIME;
+ int err, release;
+
+ err = ubifs_budget_space(c, &req);
+ if (err)
+ return err;
+
+ mutex_lock(&ui->ui_mutex);
+ if (flags & S_ATIME)
+ inode->i_atime = *time;
+ if (flags & S_VERSION)
+ inode_inc_iversion(inode);
+ if (flags & S_CTIME)
+ inode->i_ctime = *time;
+ if (flags & S_MTIME)
+ inode->i_mtime = *time;
+
+ if (!(inode->i_sb->s_flags & MS_LAZYTIME) || (flags & S_VERSION))
+ iflags |= I_DIRTY_SYNC;
+
+ release = ui->dirty;
+ __mark_inode_dirty(inode, iflags);
+ mutex_unlock(&ui->ui_mutex);
+ if (release)
+ ubifs_release_budget(c, &req);
+ return 0;
+}
+
+/**
* update_ctime - update mtime and ctime of an inode.
* @inode: inode to update
*
@@ -1546,6 +1587,9 @@ static int ubifs_file_mmap(struct file *file, struct vm_area_struct *vma)
if (err)
return err;
vma->vm_ops = &ubifs_file_vm_ops;
+#ifdef CONFIG_UBIFS_ATIME_SUPPORT
+ file_accessed(file);
+#endif
return 0;
}
@@ -1566,6 +1610,9 @@ const struct inode_operations ubifs_file_inode_operations = {
.getxattr = ubifs_getxattr,
.listxattr = ubifs_listxattr,
.removexattr = ubifs_removexattr,
+#ifdef CONFIG_UBIFS_ATIME_SUPPORT
+ .update_time = ubifs_update_time,
+#endif
};
const struct inode_operations ubifs_symlink_inode_operations = {
@@ -1577,6 +1624,9 @@ const struct inode_operations ubifs_symlink_inode_operations = {
.getxattr = ubifs_getxattr,
.listxattr = ubifs_listxattr,
.removexattr = ubifs_removexattr,
+#ifdef CONFIG_UBIFS_ATIME_SUPPORT
+ .update_time = ubifs_update_time,
+#endif
};
const struct file_operations ubifs_file_operations = {
@@ -128,7 +128,10 @@ struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
if (err)
goto out_ino;
- inode->i_flags |= (S_NOCMTIME | S_NOATIME);
+ inode->i_flags |= S_NOCMTIME;
+#ifndef CONFIG_UBIFS_ATIME_SUPPORT
+ inode->i_flags |= S_NOATIME;
+#endif
set_nlink(inode, le32_to_cpu(ino->nlink));
i_uid_write(inode, le32_to_cpu(ino->uid));
i_gid_write(inode, le32_to_cpu(ino->gid));
@@ -380,7 +383,7 @@ done:
static void ubifs_dirty_inode(struct inode *inode, int flags)
{
- struct ubifs_inode *ui = ubifs_inode(inode);
+ struct ubifs_inode *ui = ubifs_inode(inode);
ubifs_assert(mutex_is_locked(&ui->ui_mutex));
if (!ui->dirty) {
@@ -2138,7 +2141,17 @@ static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags,
if (err)
goto out_deact;
/* We do not support atime */
- sb->s_flags |= MS_ACTIVE | MS_NOATIME;
+ sb->s_flags |= MS_ACTIVE;
+#ifndef CONFIG_UBIFS_ATIME_SUPPORT
+ sb->s_flags |= MS_NOATIME;
+#else
+ ubifs_warn(c, "************WARNING START****************");
+ ubifs_warn(c, "Ubifs is supporting atime now, that would");
+ ubifs_warn(c, "probably damage your flash. If you are not");
+ ubifs_warn(c, "sure about it, please set UBIFS_ATIME_SUPPORT");
+ ubifs_warn(c, "to 'N'.");
+ ubifs_warn(c, "************WARNING END******************");
+#endif
}
/* 'fill_super()' opens ubi again so we must close it here */
@@ -1746,6 +1746,7 @@ int ubifs_calc_dark(const struct ubifs_info *c, int spc);
/* file.c */
int ubifs_fsync(struct file *file, loff_t start, loff_t end, int datasync);
int ubifs_setattr(struct dentry *dentry, struct iattr *attr);
+int ubifs_update_time(struct inode *inode, struct timespec *time, int flags);
/* dir.c */
struct inode *ubifs_new_inode(struct ubifs_info *c, const struct inode *dir,