@@ -2049,35 +2049,18 @@ int file_remove_privs(struct file *file)
}
EXPORT_SYMBOL(file_remove_privs);
-/**
- * file_update_time - update mtime and ctime time
- * @file: file accessed
- *
- * Update the mtime and ctime members of an inode and mark the inode
- * for writeback. Note that this function is meant exclusively for
- * usage in the file write path of filesystems, and filesystems may
- * choose to explicitly ignore update via this function with the
- * S_NOCMTIME inode flag, e.g. for network filesystem where these
- * timestamps are handled by the server. This can return an error for
- * file systems who need to allocate space in order to update an inode.
- */
-
-int file_update_time(struct file *file)
+static int inode_needs_update_time(struct inode *inode, struct timespec64 *now)
{
- struct inode *inode = file_inode(file);
- struct timespec64 now;
int sync_it = 0;
- int ret;
/* First try to exhaust all avenues to not sync */
if (IS_NOCMTIME(inode))
return 0;
- now = current_time(inode);
- if (!timespec64_equal(&inode->i_mtime, &now))
+ if (!timespec64_equal(&inode->i_mtime, now))
sync_it = S_MTIME;
- if (!timespec64_equal(&inode->i_ctime, &now))
+ if (!timespec64_equal(&inode->i_ctime, now))
sync_it |= S_CTIME;
if (IS_I_VERSION(inode) && inode_iversion_need_inc(inode))
@@ -2086,15 +2069,50 @@ int file_update_time(struct file *file)
if (!sync_it)
return 0;
- /* Finally allowed to write? Takes lock. */
- if (__mnt_want_write_file(file))
- return 0;
+ return sync_it;
+}
+
+static int __file_update_time(struct file *file, struct timespec64 *now,
+ int sync_mode)
+{
+ int ret = 0;
+ struct inode *inode = file_inode(file);
- ret = inode_update_time(inode, &now, sync_it);
- __mnt_drop_write_file(file);
+ /* try to update time settings */
+ if (!__mnt_want_write_file(file)) {
+ ret = inode_update_time(inode, now, sync_mode);
+ __mnt_drop_write_file(file);
+ }
return ret;
}
+
+ /**
+ * file_update_time - update mtime and ctime time
+ * @file: file accessed
+ *
+ * Update the mtime and ctime members of an inode and mark the inode for
+ * writeback. Note that this function is meant exclusively for usage in
+ * the file write path of filesystems, and filesystems may choose to
+ * explicitly ignore updates via this function with the _NOCMTIME inode
+ * flag, e.g. for network filesystem where these imestamps are handled
+ * by the server. This can return an error for file systems who need to
+ * allocate space in order to update an inode.
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+int file_update_time(struct file *file)
+{
+ int ret;
+ struct inode *inode = file_inode(file);
+ struct timespec64 now = current_time(inode);
+
+ ret = inode_needs_update_time(inode, &now);
+ if (ret <= 0)
+ return ret;
+
+ return __file_update_time(file, &now, ret);
+}
EXPORT_SYMBOL(file_update_time);
/**
@@ -2111,6 +2129,8 @@ EXPORT_SYMBOL(file_update_time);
int file_modified(struct file *file)
{
int ret;
+ struct inode *inode = file_inode(file);
+ struct timespec64 now = current_time(inode);
/*
* Clear the security bits if the process is not being run by root.
@@ -2123,7 +2143,11 @@ int file_modified(struct file *file)
if (unlikely(file->f_mode & FMODE_NOCMTIME))
return 0;
- return file_update_time(file);
+ ret = inode_needs_update_time(inode, &now);
+ if (ret <= 0)
+ return ret;
+
+ return __file_update_time(file, &now, ret);
}
EXPORT_SYMBOL(file_modified);
This splits off the functions inode_needs_update_time() and __file_update_time() from the function file_update_time(). This is required to support async buffered writes. No intended functional changes in this patch. Signed-off-by: Stefan Roesch <shr@fb.com> --- fs/inode.c | 76 +++++++++++++++++++++++++++++++++++------------------- 1 file changed, 50 insertions(+), 26 deletions(-)