diff options
author | Amir Goldstein <amir73il@gmail.com> | 2020-09-29 15:28:47 +0800 |
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committer | Miklos Szeredi <mszeredi@redhat.com> | 2020-10-06 15:38:14 +0200 |
commit | 61536bed2149b082748f8a38c593d915ff3e5957 (patch) | |
tree | 650bd20e89098381d36658935b3554ccee1b33ee /fs/overlayfs/readdir.c | |
parent | 8f6ee74c27860d4a4c6e0f8cf772bb2afc184bcb (diff) | |
download | linux-61536bed2149b082748f8a38c593d915ff3e5957.tar.bz2 |
ovl: support [S|G]ETFLAGS and FS[S|G]ETXATTR ioctls for directories
[S|G]ETFLAGS and FS[S|G]ETXATTR ioctls are applicable to both files and
directories, so add ioctl operations to dir as well.
We teach ovl_real_fdget() to get the realfile of directories which use
a different type of file->private_data.
Ifdef away compat ioctl implementation to conform to standard practice.
With this change, xfstest generic/079 which tests these ioctls on files
and directories passes.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/readdir.c')
-rw-r--r-- | fs/overlayfs/readdir.c | 44 |
1 files changed, 35 insertions, 9 deletions
diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c index 596002054ac6..01620ebae1bd 100644 --- a/fs/overlayfs/readdir.c +++ b/fs/overlayfs/readdir.c @@ -840,7 +840,7 @@ out_unlock: return res; } -static struct file *ovl_dir_open_realfile(struct file *file, +static struct file *ovl_dir_open_realfile(const struct file *file, struct path *realpath) { struct file *res; @@ -853,19 +853,22 @@ static struct file *ovl_dir_open_realfile(struct file *file, return res; } -static int ovl_dir_fsync(struct file *file, loff_t start, loff_t end, - int datasync) +/* + * Like ovl_real_fdget(), returns upperfile if dir was copied up since open. + * Unlike ovl_real_fdget(), this caches upperfile in file->private_data. + * + * TODO: use same abstract type for file->private_data of dir and file so + * upperfile could also be cached for files as well. + */ +struct file *ovl_dir_real_file(const struct file *file, bool want_upper) { + struct ovl_dir_file *od = file->private_data; struct dentry *dentry = file->f_path.dentry; struct file *realfile = od->realfile; - /* Nothing to sync for lower */ if (!OVL_TYPE_UPPER(ovl_path_type(dentry))) - return 0; - - if (!ovl_should_sync(OVL_FS(dentry->d_sb))) - return 0; + return want_upper ? NULL : realfile; /* * Need to check if we started out being a lower dir, but got copied up @@ -884,7 +887,7 @@ static int ovl_dir_fsync(struct file *file, loff_t start, loff_t end, if (!od->upperfile) { if (IS_ERR(realfile)) { inode_unlock(inode); - return PTR_ERR(realfile); + return realfile; } smp_store_release(&od->upperfile, realfile); } else { @@ -897,6 +900,25 @@ static int ovl_dir_fsync(struct file *file, loff_t start, loff_t end, } } + return realfile; +} + +static int ovl_dir_fsync(struct file *file, loff_t start, loff_t end, + int datasync) +{ + struct file *realfile; + int err; + + if (!ovl_should_sync(OVL_FS(file->f_path.dentry->d_sb))) + return 0; + + realfile = ovl_dir_real_file(file, true); + err = PTR_ERR_OR_ZERO(realfile); + + /* Nothing to sync for lower */ + if (!realfile || err) + return err; + return vfs_fsync_range(realfile, start, end, datasync); } @@ -949,6 +971,10 @@ const struct file_operations ovl_dir_operations = { .llseek = ovl_dir_llseek, .fsync = ovl_dir_fsync, .release = ovl_dir_release, + .unlocked_ioctl = ovl_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = ovl_compat_ioctl, +#endif }; int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list) |