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fsnotify: Support FS_ERROR event type

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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.

Link: https://lore.kernel.org/r/20211025192746.66445-18-krisman@collabora.com
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Gabriel Krisman Bertazi 2021-10-25 16:27:32 -03:00 committed by Jan Kara
parent 4fe595cf1c
commit 9daa811073
2 changed files with 44 additions and 1 deletions
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13
include/linux/fsnotify.h
View File

@ -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 */

32
include/linux/fsnotify_backend.h
View File

@ -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 | \
@ -250,6 +257,13 @@ 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)
@ -261,6 +275,8 @@ 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;
}
@ -300,6 +316,20 @@ 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;
}