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authorLinus Torvalds <torvalds@linux-foundation.org>2012-08-01 10:26:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-08-01 10:26:23 -0700
commita0e881b7c189fa2bd76c024dbff91e79511c971d (patch)
tree0c801918565b08921d21aceee5b326f64d998f5f /fs/pipe.c
parenteff0d13f3823f35d70228cd151d2a2c89288ff32 (diff)
parentdbc6e0222d79e78925fe20733844a796a4b72cf9 (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull second vfs pile from Al Viro: "The stuff in there: fsfreeze deadlock fixes by Jan (essentially, the deadlock reproduced by xfstests 068), symlink and hardlink restriction patches, plus assorted cleanups and fixes. Note that another fsfreeze deadlock (emergency thaw one) is *not* dealt with - the series by Fernando conflicts a lot with Jan's, breaks userland ABI (FIFREEZE semantics gets changed) and trades the deadlock for massive vfsmount leak; this is going to be handled next cycle. There probably will be another pull request, but that stuff won't be in it." Fix up trivial conflicts due to unrelated changes next to each other in drivers/{staging/gdm72xx/usb_boot.c, usb/gadget/storage_common.c} * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (54 commits) delousing target_core_file a bit Documentation: Correct s_umount state for freeze_fs/unfreeze_fs fs: Remove old freezing mechanism ext2: Implement freezing btrfs: Convert to new freezing mechanism nilfs2: Convert to new freezing mechanism ntfs: Convert to new freezing mechanism fuse: Convert to new freezing mechanism gfs2: Convert to new freezing mechanism ocfs2: Convert to new freezing mechanism xfs: Convert to new freezing code ext4: Convert to new freezing mechanism fs: Protect write paths by sb_start_write - sb_end_write fs: Skip atime update on frozen filesystem fs: Add freezing handling to mnt_want_write() / mnt_drop_write() fs: Improve filesystem freezing handling switch the protection of percpu_counter list to spinlock nfsd: Push mnt_want_write() outside of i_mutex btrfs: Push mnt_want_write() outside of i_mutex fat: Push mnt_want_write() outside of i_mutex ...
Diffstat (limited to 'fs/pipe.c')
-rw-r--r--fs/pipe.c75
1 files changed, 26 insertions, 49 deletions
diff --git a/fs/pipe.c b/fs/pipe.c
index 95cbd6b227e..8d85d7068c1 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -1016,18 +1016,16 @@ fail_inode:
return NULL;
}
-struct file *create_write_pipe(int flags)
+int create_pipe_files(struct file **res, int flags)
{
int err;
- struct inode *inode;
+ struct inode *inode = get_pipe_inode();
struct file *f;
struct path path;
- struct qstr name = { .name = "" };
+ static struct qstr name = { .name = "" };
- err = -ENFILE;
- inode = get_pipe_inode();
if (!inode)
- goto err;
+ return -ENFILE;
err = -ENOMEM;
path.dentry = d_alloc_pseudo(pipe_mnt->mnt_sb, &name);
@@ -1041,62 +1039,43 @@ struct file *create_write_pipe(int flags)
f = alloc_file(&path, FMODE_WRITE, &write_pipefifo_fops);
if (!f)
goto err_dentry;
- f->f_mapping = inode->i_mapping;
f->f_flags = O_WRONLY | (flags & (O_NONBLOCK | O_DIRECT));
- f->f_version = 0;
- return f;
+ res[0] = alloc_file(&path, FMODE_READ, &read_pipefifo_fops);
+ if (!res[0])
+ goto err_file;
+
+ path_get(&path);
+ res[0]->f_flags = O_RDONLY | (flags & O_NONBLOCK);
+ res[1] = f;
+ return 0;
- err_dentry:
+err_file:
+ put_filp(f);
+err_dentry:
free_pipe_info(inode);
path_put(&path);
- return ERR_PTR(err);
+ return err;
- err_inode:
+err_inode:
free_pipe_info(inode);
iput(inode);
- err:
- return ERR_PTR(err);
-}
-
-void free_write_pipe(struct file *f)
-{
- free_pipe_info(f->f_dentry->d_inode);
- path_put(&f->f_path);
- put_filp(f);
-}
-
-struct file *create_read_pipe(struct file *wrf, int flags)
-{
- /* Grab pipe from the writer */
- struct file *f = alloc_file(&wrf->f_path, FMODE_READ,
- &read_pipefifo_fops);
- if (!f)
- return ERR_PTR(-ENFILE);
-
- path_get(&wrf->f_path);
- f->f_flags = O_RDONLY | (flags & O_NONBLOCK);
-
- return f;
+ return err;
}
int do_pipe_flags(int *fd, int flags)
{
- struct file *fw, *fr;
+ struct file *files[2];
int error;
int fdw, fdr;
if (flags & ~(O_CLOEXEC | O_NONBLOCK | O_DIRECT))
return -EINVAL;
- fw = create_write_pipe(flags);
- if (IS_ERR(fw))
- return PTR_ERR(fw);
- fr = create_read_pipe(fw, flags);
- error = PTR_ERR(fr);
- if (IS_ERR(fr))
- goto err_write_pipe;
+ error = create_pipe_files(files, flags);
+ if (error)
+ return error;
error = get_unused_fd_flags(flags);
if (error < 0)
@@ -1109,8 +1088,8 @@ int do_pipe_flags(int *fd, int flags)
fdw = error;
audit_fd_pair(fdr, fdw);
- fd_install(fdr, fr);
- fd_install(fdw, fw);
+ fd_install(fdr, files[0]);
+ fd_install(fdw, files[1]);
fd[0] = fdr;
fd[1] = fdw;
@@ -1119,10 +1098,8 @@ int do_pipe_flags(int *fd, int flags)
err_fdr:
put_unused_fd(fdr);
err_read_pipe:
- path_put(&fr->f_path);
- put_filp(fr);
- err_write_pipe:
- free_write_pipe(fw);
+ fput(files[0]);
+ fput(files[1]);
return error;
}