The patch titled r/o bind mounts: create helper to drop file write access has been removed from the -mm tree. Its filename was r-o-bind-mounts-create-helper-to-drop-file-write-access.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: r/o bind mounts: create helper to drop file write access From: Dave Hansen <haveblue@xxxxxxxxxx> If someone decides to demote a file from r/w to just r/o, they can use this same code as __fput(). NFS does just that, and will use this in the next patch. Signed-off-by: Dave Hansen <haveblue@xxxxxxxxxx> Cc: Erez Zadok <ezk@xxxxxxxxxxxxx> Cc: Trond Myklebust <trond.myklebust@xxxxxxxxxx> Cc: "J Bruce Fields" <bfields@xxxxxxxxxxxx> Acked-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Christoph Hellwig <hch@xxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/file_table.c | 19 ++++++++++++++++++- fs/nfsd/nfs4state.c | 3 ++- include/linux/file.h | 1 + 3 files changed, 21 insertions(+), 2 deletions(-) diff -puN fs/file_table.c~r-o-bind-mounts-create-helper-to-drop-file-write-access fs/file_table.c --- a/fs/file_table.c~r-o-bind-mounts-create-helper-to-drop-file-write-access +++ a/fs/file_table.c @@ -211,6 +211,23 @@ void fput(struct file *file) EXPORT_SYMBOL(fput); +/** + * drop_file_write_access - give up ability to write to a file + * @file: the file to which we will stop writing + * + * This is a central place which will give up the ability + * to write to @file, along with access to write through + * its vfsmount. + */ +void drop_file_write_access(struct file *file) +{ + struct dentry *dentry = file->f_path.dentry; + struct inode *inode = dentry->d_inode; + + put_write_access(inode); +} +EXPORT_SYMBOL_GPL(drop_file_write_access); + /* __fput is called from task context when aio completion releases the last * last use of a struct file *. Do not use otherwise. */ @@ -237,7 +254,7 @@ void __fput(struct file *file) cdev_put(inode->i_cdev); fops_put(file->f_op); if (file->f_mode & FMODE_WRITE) - put_write_access(inode); + drop_file_write_access(file); put_pid(file->f_owner.pid); file_kill(file); file->f_path.dentry = NULL; diff -puN fs/nfsd/nfs4state.c~r-o-bind-mounts-create-helper-to-drop-file-write-access fs/nfsd/nfs4state.c --- a/fs/nfsd/nfs4state.c~r-o-bind-mounts-create-helper-to-drop-file-write-access +++ a/fs/nfsd/nfs4state.c @@ -41,6 +41,7 @@ #include <linux/sunrpc/svc.h> #include <linux/nfsd/nfsd.h> #include <linux/nfsd/cache.h> +#include <linux/file.h> #include <linux/mount.h> #include <linux/workqueue.h> #include <linux/smp_lock.h> @@ -1239,7 +1240,7 @@ static inline void nfs4_file_downgrade(struct file *filp, unsigned int share_access) { if (share_access & NFS4_SHARE_ACCESS_WRITE) { - put_write_access(filp->f_path.dentry->d_inode); + drop_file_write_access(filp); filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE; } } diff -puN include/linux/file.h~r-o-bind-mounts-create-helper-to-drop-file-write-access include/linux/file.h --- a/include/linux/file.h~r-o-bind-mounts-create-helper-to-drop-file-write-access +++ a/include/linux/file.h @@ -61,6 +61,7 @@ extern struct kmem_cache *filp_cachep; extern void __fput(struct file *); extern void fput(struct file *); +extern void drop_file_write_access(struct file *file); struct file_operations; struct vfsmount; _ Patches currently in -mm which might be from haveblue@xxxxxxxxxx are git-vfs.patch hugetlb-decrease-hugetlb_lock-cycling-in-gather_surplus_huge_pages.patch mm-make-mem_map-allocation-continuous.patch vfs-create-proc-pid-mountinfo.patch vfs-mountinfo-mm-fix.patch vfs-pnode-cleanup.patch vfs-mountinfo-stable-peer-group-id.patch vfs-mountinfo-show-dominating-group-id.patch vfs-optimization-to-proc-pid-mountinfo-patch.patch vfs-mountinfo-only-show-mounts-under-tasks-root.patch kprobes-prevent-probing-of-preempt_schedule.patch kprobes-prevent-probing-of-preempt_schedule-fix.patch kprobes-prevent-probing-of-preempt_schedule-checkpatch-fixes.patch reiser4.patch page-owner-tracking-leak-detector.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html