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gunixmounts: Mark mounts as system internal instead of filtering out

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mntent-based implementation filter out mounts with device path that was
repeated. Consequently, it is not possible to show such mounts in UI even
with x-gvfs-show, because they are not returned from g_unix_mounts_get.
libmount-based implementation currently doesn't filter out any mounts
which causes issues to our volume monitors. Let's rather mark mounts
which don't point into fs root as system_internal. This approach won't be
affected by mount order as is mntent-based implementation. It will mark
more mounts as system_internal than it is filtered out with mntend-based
implementation, but there will be always possibility to show them in UI
over x-gvfs-show, which was not possible with mntend-based. We can
probably introduce some improvements later to not mark unique mounts as
system internal even if they don't point into fs root...

https://gitlab.gnome.org/GNOME/glib/issues/1271
This commit is contained in:
Ondrej Holy 2018-04-26 16:22:36 +02:00
parent e1fa5ffb91
commit 983a95c9dc
1 changed files with 29 additions and 4 deletions
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33
gio/gunixmounts.c
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@ -389,8 +389,9 @@ g_unix_is_system_device_path (const char *device_path)
static gboolean
guess_system_internal (const char *mountpoint,
const char *fs,
const char *device)
const char *fs,
const char *device,
const char *root)
{
if (g_unix_is_system_fs_type (fs))
return TRUE;
@ -400,7 +401,29 @@ guess_system_internal (const char *mountpoint,
if (g_unix_is_mount_path_system_internal (mountpoint))
return TRUE;
/* It is not possible to reliably detect mounts which were created by bind
* operation. mntent-based _g_get_unix_mounts() implementation blindly skips
* mounts with a device path that is repeated (e.g. mounts created by bind
* operation, btrfs subvolumes). This usually chooses the most important
* mounts (i.e. which points to the root of filesystem), but it doesn't work
* in all cases and also it is not ideal that those mounts are completely
* ignored (e.g. x-gvfs-show doesn't work for them, trash backend can't handle
* files on btrfs subvolumes). libmount-based _g_get_unix_mounts()
* implementation provides a root path. So there is no need to completely
* ignore those mounts, because e.g. our volume monitors can use the root path
* to not mengle those mounts with the "regular" mounts (i.e. which points to
* the root). But because those mounts usually just duplicate other mounts and
* are completely ignored with mntend-based implementation, let's mark them as
* system internal. Given the different approches it doesn't mean that all
* mounts which were ignored will be system internal now, but this should work
* in most cases. For more info, see g_unix_mount_get_root_path() annotation,
* comment in mntent-based _g_get_unix_mounts() implementation and the
* https://gitlab.gnome.org/GNOME/glib/issues/1271 issue.
*/
if (root != NULL && g_strcmp0 (root, "/") != 0)
return TRUE;
return FALSE;
}
@ -427,7 +450,9 @@ create_unix_mount_entry (const char *device_path,
mount_entry->is_system_internal =
guess_system_internal (mount_entry->mount_path,
mount_entry->filesystem_type,
mount_entry->device_path);
mount_entry->device_path,
mount_entry->root_path);
return mount_entry;
}