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fs: add generic helper for filling statx attribute flags 

The immutable and append-only properties on an inode are published on
the inode's i_flags and enforced by the VFS.

Create a helper to fill the corresponding STATX_ATTR_ flags in the kstat
structure from the inode's i_flags.

Only orange was converted to use this helper.
Other filesystems could use it in the future.

Suggested-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein 2021-06-19 12:26:16 +03:00 committed by Miklos Szeredi
parent 7c60610d47
commit 4f911138c8
4 changed files with 24 additions and 6 deletions
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7
fs/orangefs/inode.c
View File

@ -882,12 +882,7 @@ int orangefs_getattr(struct user_namespace *mnt_userns, const struct path *path,
if (!(request_mask & STATX_SIZE))
stat->result_mask &= ~STATX_SIZE;
stat->attributes_mask = STATX_ATTR_IMMUTABLE |
STATX_ATTR_APPEND;
if (inode->i_flags & S_IMMUTABLE)
stat->attributes |= STATX_ATTR_IMMUTABLE;
if (inode->i_flags & S_APPEND)
stat->attributes |= STATX_ATTR_APPEND;
generic_fill_statx_attr(inode, stat);
}
return ret;
}

18
fs/stat.c
View File

@ -59,6 +59,24 @@ void generic_fillattr(struct user_namespace *mnt_userns, struct inode *inode,
}
EXPORT_SYMBOL(generic_fillattr);
/**
* generic_fill_statx_attr - Fill in the statx attributes from the inode flags
* @inode: Inode to use as the source
* @stat: Where to fill in the attribute flags
*
* Fill in the STATX_ATTR_* flags in the kstat structure for properties of the
* inode that are published on i_flags and enforced by the VFS.
*/
void generic_fill_statx_attr(struct inode *inode, struct kstat *stat)
{
if (inode->i_flags & S_IMMUTABLE)
stat->attributes |= STATX_ATTR_IMMUTABLE;
if (inode->i_flags & S_APPEND)
stat->attributes |= STATX_ATTR_APPEND;
stat->attributes_mask |= KSTAT_ATTR_VFS_FLAGS;
}
EXPORT_SYMBOL(generic_fill_statx_attr);
/**
* vfs_getattr_nosec - getattr without security checks
* @path: file to get attributes from

1
include/linux/fs.h
View File

@ -3355,6 +3355,7 @@ extern int page_symlink(struct inode *inode, const char *symname, int len);
extern const struct inode_operations page_symlink_inode_operations;
extern void kfree_link(void *);
void generic_fillattr(struct user_namespace *, struct inode *, struct kstat *);
void generic_fill_statx_attr(struct inode *inode, struct kstat *stat);
extern int vfs_getattr_nosec(const struct path *, struct kstat *, u32, unsigned int);
extern int vfs_getattr(const struct path *, struct kstat *, u32, unsigned int);
void __inode_add_bytes(struct inode *inode, loff_t bytes);

4
include/linux/stat.h
View File

@ -34,6 +34,10 @@ struct kstat {
STATX_ATTR_ENCRYPTED | \
STATX_ATTR_VERITY \
)/* Attrs corresponding to FS_*_FL flags */
#define KSTAT_ATTR_VFS_FLAGS \
(STATX_ATTR_IMMUTABLE | \
STATX_ATTR_APPEND \
) /* Attrs corresponding to S_* flags that are enforced by the VFS */
u64 ino;
dev_t dev;
dev_t rdev;