Expose a new type of fsnotify event for filesystems to report errors for
userspace monitoring tools. fanotify will send this type of
notification for FAN_FS_ERROR events. This also introduce a helper for
generating the new event.
Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx>
---
Changes since v6:
- Add fsnotify_data_error_report
Changes since v5:
- pass sb inside data field (jan)
Changes since v3:
- Squash patch ("fsnotify: Introduce helpers to send error_events")
- Drop reviewed-bys!
Changes since v2:
- FAN_ERROR->FAN_FS_ERROR (Amir)
Changes since v1:
- Overload FS_ERROR with FS_IN_IGNORED
- Implement support for this type on fsnotify_data_inode (Amir)
---
include/linux/fsnotify.h | 13 +++++++++++++
include/linux/fsnotify_backend.h | 32 +++++++++++++++++++++++++++++++-
2 files changed, 44 insertions(+), 1 deletion(-)
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index 1e5f7435a4b5..787545e87eeb 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -339,4 +339,17 @@ static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
fsnotify_dentry(dentry, mask);
}
+static inline int fsnotify_sb_error(struct super_block *sb, struct inode *inode,
+ int error)
+{
+ struct fs_error_report report = {
+ .error = error,
+ .inode = inode,
+ .sb = sb,
+ };
+
+ return fsnotify(FS_ERROR, &report, FSNOTIFY_EVENT_ERROR,
+ NULL, NULL, NULL, 0);
+}
+
#endif /* _LINUX_FS_NOTIFY_H */
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 1e69e9fe45c9..a378a314e309 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -42,6 +42,12 @@
#define FS_UNMOUNT 0x00002000 /* inode on umount fs */
#define FS_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
+#define FS_ERROR 0x00008000 /* Filesystem Error (fanotify) */
+
+/*
+ * FS_IN_IGNORED overloads FS_ERROR. It is only used internally by inotify
+ * which does not support FS_ERROR.
+ */
#define FS_IN_IGNORED 0x00008000 /* last inotify event here */
#define FS_OPEN_PERM 0x00010000 /* open event in an permission hook */
@@ -95,7 +101,8 @@
#define ALL_FSNOTIFY_EVENTS (ALL_FSNOTIFY_DIRENT_EVENTS | \
FS_EVENTS_POSS_ON_CHILD | \
FS_DELETE_SELF | FS_MOVE_SELF | FS_DN_RENAME | \
- FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED)
+ FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \
+ FS_ERROR)
/* Extra flags that may be reported with event or control handling of events */
#define ALL_FSNOTIFY_FLAGS (FS_EXCL_UNLINK | FS_ISDIR | FS_IN_ONESHOT | \
@@ -249,6 +256,13 @@ enum fsnotify_data_type {
FSNOTIFY_EVENT_PATH,
FSNOTIFY_EVENT_INODE,
FSNOTIFY_EVENT_DENTRY,
+ FSNOTIFY_EVENT_ERROR,
+};
+
+struct fs_error_report {
+ int error;
+ struct inode *inode;
+ struct super_block *sb;
};
static inline struct inode *fsnotify_data_inode(const void *data, int data_type)
@@ -260,6 +274,8 @@ static inline struct inode *fsnotify_data_inode(const void *data, int data_type)
return d_inode(data);
case FSNOTIFY_EVENT_PATH:
return d_inode(((const struct path *)data)->dentry);
+ case FSNOTIFY_EVENT_ERROR:
+ return ((struct fs_error_report *)data)->inode;
default:
return NULL;
}
@@ -299,6 +315,20 @@ static inline struct super_block *fsnotify_data_sb(const void *data,
return ((struct dentry *)data)->d_sb;
case FSNOTIFY_EVENT_PATH:
return ((const struct path *)data)->dentry->d_sb;
+ case FSNOTIFY_EVENT_ERROR:
+ return ((struct fs_error_report *) data)->sb;
+ default:
+ return NULL;
+ }
+}
+
+static inline struct fs_error_report *fsnotify_data_error_report(
+ const void *data,
+ int data_type)
+{
+ switch (data_type) {
+ case FSNOTIFY_EVENT_ERROR:
+ return (struct fs_error_report *) data;
default:
return NULL;
}
--
2.33.0
