From: Kinglong Mee <kinglongmee-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> To: Al Viro <viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>, "J. Bruce Fields" <bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>, "linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: NeilBrown <neilb-l3A5Bk7waGM@public.gmane.org>, Trond Myklebust <trond.myklebust-7I+n7zu2hftEKMMhf/gKZA@public.gmane.org>, kinglongmee-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org Subject: [PATCH 04/10 v7] fs: New helper legitimize_mntget() for getting a legitimize mnt Date: Sat, 11 Jul 2015 20:48:44 +0800 [thread overview] Message-ID: <55A110AC.2040509@gmail.com> (raw) In-Reply-To: <55A11010.6050005-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> New helper legitimize_mntget for getting a mnt without setting MNT_SYNC_UMOUNT | MNT_UMOUNT | MNT_DOOMED, otherwise return NULL. v7, same as v6 Signed-off-by: Kinglong Mee <kinglongmee-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> --- fs/namespace.c | 19 +++++++++++++++++++ include/linux/mount.h | 1 + 2 files changed, 20 insertions(+) diff --git a/fs/namespace.c b/fs/namespace.c index c7cb8a5..8709f61 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -1153,6 +1153,25 @@ struct vfsmount *mntget(struct vfsmount *mnt) } EXPORT_SYMBOL(mntget); +struct vfsmount *legitimize_mntget(struct vfsmount *vfsmnt) +{ + struct mount *mnt; + + if (vfsmnt == NULL) + return NULL; + + read_seqlock_excl(&mount_lock); + mnt = real_mount(vfsmnt); + if (vfsmnt->mnt_flags & (MNT_SYNC_UMOUNT | MNT_UMOUNT | MNT_DOOMED)) + vfsmnt = NULL; + else + mnt_add_count(mnt, 1); + read_sequnlock_excl(&mount_lock); + + return vfsmnt; +} +EXPORT_SYMBOL(legitimize_mntget); + struct vfsmount *mnt_clone_internal(struct path *path) { struct mount *p; diff --git a/include/linux/mount.h b/include/linux/mount.h index f822c3c..8ae9dc0 100644 --- a/include/linux/mount.h +++ b/include/linux/mount.h @@ -79,6 +79,7 @@ extern void mnt_drop_write(struct vfsmount *mnt); extern void mnt_drop_write_file(struct file *file); extern void mntput(struct vfsmount *mnt); extern struct vfsmount *mntget(struct vfsmount *mnt); +extern struct vfsmount *legitimize_mntget(struct vfsmount *vfsmnt); extern struct vfsmount *mnt_clone_internal(struct path *path); extern int __mnt_is_readonly(struct vfsmount *mnt); -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html
WARNING: multiple messages have this Message-ID (diff)
From: Kinglong Mee <kinglongmee@gmail.com> To: Al Viro <viro@zeniv.linux.org.uk>, "J. Bruce Fields" <bfields@fieldses.org>, "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>, linux-fsdevel@vger.kernel.org Cc: NeilBrown <neilb@suse.de>, Trond Myklebust <trond.myklebust@primarydata.com>, kinglongmee@gmail.com Subject: [PATCH 04/10 v7] fs: New helper legitimize_mntget() for getting a legitimize mnt Date: Sat, 11 Jul 2015 20:48:44 +0800 [thread overview] Message-ID: <55A110AC.2040509@gmail.com> (raw) In-Reply-To: <55A11010.6050005@gmail.com> New helper legitimize_mntget for getting a mnt without setting MNT_SYNC_UMOUNT | MNT_UMOUNT | MNT_DOOMED, otherwise return NULL. v7, same as v6 Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> --- fs/namespace.c | 19 +++++++++++++++++++ include/linux/mount.h | 1 + 2 files changed, 20 insertions(+) diff --git a/fs/namespace.c b/fs/namespace.c index c7cb8a5..8709f61 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -1153,6 +1153,25 @@ struct vfsmount *mntget(struct vfsmount *mnt) } EXPORT_SYMBOL(mntget); +struct vfsmount *legitimize_mntget(struct vfsmount *vfsmnt) +{ + struct mount *mnt; + + if (vfsmnt == NULL) + return NULL; + + read_seqlock_excl(&mount_lock); + mnt = real_mount(vfsmnt); + if (vfsmnt->mnt_flags & (MNT_SYNC_UMOUNT | MNT_UMOUNT | MNT_DOOMED)) + vfsmnt = NULL; + else + mnt_add_count(mnt, 1); + read_sequnlock_excl(&mount_lock); + + return vfsmnt; +} +EXPORT_SYMBOL(legitimize_mntget); + struct vfsmount *mnt_clone_internal(struct path *path) { struct mount *p; diff --git a/include/linux/mount.h b/include/linux/mount.h index f822c3c..8ae9dc0 100644 --- a/include/linux/mount.h +++ b/include/linux/mount.h @@ -79,6 +79,7 @@ extern void mnt_drop_write(struct vfsmount *mnt); extern void mnt_drop_write_file(struct file *file); extern void mntput(struct vfsmount *mnt); extern struct vfsmount *mntget(struct vfsmount *mnt); +extern struct vfsmount *legitimize_mntget(struct vfsmount *vfsmnt); extern struct vfsmount *mnt_clone_internal(struct path *path); extern int __mnt_is_readonly(struct vfsmount *mnt); -- 2.4.3
next prev parent reply other threads:[~2015-07-11 12:48 UTC|newest] Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-07-11 12:46 [PATCH 00/10 v7] NFSD: Pin to vfsmount for nfsd exports cache Kinglong Mee 2015-07-11 12:46 ` Kinglong Mee 2015-07-11 12:49 ` [PATCH 05/10 v7] sunrpc: Store cache_detail in seq_file's private, directly Kinglong Mee 2015-07-11 12:49 ` [PATCH 06/10 v7] sunrpc/nfsd: Remove redundant code by exports seq_operations functions Kinglong Mee [not found] ` <55A11010.6050005-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2015-07-11 12:47 ` [PATCH 01/10 v7] fs_pin: Initialize value for fs_pin explicitly Kinglong Mee 2015-07-11 12:47 ` Kinglong Mee 2015-07-11 12:47 ` [PATCH 02/10 v7] fs_pin: Export functions for specific filesystem Kinglong Mee 2015-07-11 12:47 ` Kinglong Mee 2015-07-11 12:48 ` [PATCH 03/10 v7] path: New helpers path_get_pin/path_put_unpin for path pin Kinglong Mee 2015-07-11 12:48 ` Kinglong Mee 2015-07-11 12:48 ` Kinglong Mee [this message] 2015-07-11 12:48 ` [PATCH 04/10 v7] fs: New helper legitimize_mntget() for getting a legitimize mnt Kinglong Mee 2015-07-11 12:50 ` [PATCH 07/10 v7] sunrpc: Switch to using list_head instead single list Kinglong Mee 2015-07-11 12:50 ` Kinglong Mee [not found] ` <55A11112.8080502-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2015-07-11 12:54 ` Christoph Hellwig 2015-07-11 12:54 ` Christoph Hellwig 2015-07-13 1:30 ` NeilBrown 2015-07-13 8:27 ` Kinglong Mee 2015-07-13 8:27 ` Kinglong Mee 2015-07-11 12:51 ` [PATCH 09/10 v7] sunrpc: Support get_ref/put_ref for reference change in cache_head Kinglong Mee 2015-07-11 12:51 ` Kinglong Mee 2015-07-11 12:52 ` [PATCH 10/10 v7] nfsd: Allows user un-mounting filesystem where nfsd exports base on Kinglong Mee 2015-07-11 12:52 ` Kinglong Mee [not found] ` <55A111A8.2040701-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2015-07-13 3:39 ` NeilBrown 2015-07-13 3:39 ` NeilBrown 2015-07-13 4:02 ` Al Viro [not found] ` <20150713040258.GM17109-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org> 2015-07-13 5:19 ` NeilBrown 2015-07-13 5:19 ` NeilBrown 2015-07-13 6:02 ` Al Viro 2015-07-13 6:02 ` Al Viro 2015-07-13 4:20 ` NeilBrown 2015-07-13 4:45 ` Al Viro 2015-07-13 4:45 ` Al Viro [not found] ` <20150713044553.GN17109-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org> 2015-07-13 5:21 ` NeilBrown 2015-07-13 5:21 ` NeilBrown 2015-07-13 6:02 ` NeilBrown 2015-07-13 6:02 ` NeilBrown 2015-07-13 6:08 ` Al Viro 2015-07-13 6:08 ` Al Viro [not found] ` <20150713060802.GP17109-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org> 2015-07-13 6:32 ` NeilBrown 2015-07-13 6:32 ` NeilBrown 2015-07-13 6:43 ` Al Viro 2015-07-13 6:43 ` Al Viro 2015-07-15 3:49 ` NeilBrown 2015-07-15 4:57 ` Al Viro 2015-07-15 4:57 ` Al Viro 2015-07-15 6:51 ` NeilBrown 2015-07-24 2:05 ` NeilBrown 2015-07-27 2:28 ` Kinglong Mee [not found] ` <55B59764.1020506-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2015-07-27 2:51 ` NeilBrown 2015-07-27 2:51 ` NeilBrown 2015-07-27 3:17 ` Kinglong Mee 2015-07-15 21:07 ` J. Bruce Fields 2015-07-15 21:07 ` J. Bruce Fields [not found] ` <20150715210756.GE21669-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org> 2015-07-15 23:40 ` NeilBrown 2015-07-15 23:40 ` NeilBrown 2015-07-16 20:51 ` J. Bruce Fields 2015-07-16 20:51 ` J. Bruce Fields [not found] ` <20150716205148.GC10673-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org> 2015-07-21 21:58 ` NeilBrown 2015-07-21 21:58 ` NeilBrown 2015-07-22 15:08 ` J. Bruce Fields 2015-07-22 15:08 ` J. Bruce Fields [not found] ` <20150722150840.GH22718-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org> 2015-07-23 23:46 ` export table lookup: was " NeilBrown 2015-07-23 23:46 ` NeilBrown 2015-07-24 19:48 ` J. Bruce Fields 2015-07-24 19:48 ` J. Bruce Fields 2015-07-25 0:40 ` NeilBrown 2015-07-11 12:51 ` [PATCH 08/10 v7] sunrpc: New helper cache_delete_entry for deleting cache_head directly Kinglong Mee
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