| Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/nfs/file.c |
| 3 | * |
| 4 | * Copyright (C) 1992 Rick Sladkey |
| 5 | */ |
| 6 | #include <linux/nfs_fs.h> |
| 7 | #include "internal.h" |
| 8 | #include "pnfs.h" |
| 9 | |
| 10 | #define NFSDBG_FACILITY NFSDBG_FILE |
| 11 | |
| 12 | static int |
| 13 | nfs4_file_open(struct inode *inode, struct file *filp) |
| 14 | { |
| 15 | struct nfs_open_context *ctx; |
| 16 | struct dentry *dentry = filp->f_path.dentry; |
| 17 | struct dentry *parent = NULL; |
| 18 | struct inode *dir; |
| 19 | unsigned openflags = filp->f_flags; |
| 20 | struct iattr attr; |
| 21 | int err; |
| 22 | |
| 23 | BUG_ON(inode != dentry->d_inode); |
| 24 | /* |
| 25 | * If no cached dentry exists or if it's negative, NFSv4 handled the |
| 26 | * opens in ->lookup() or ->create(). |
| 27 | * |
| 28 | * We only get this far for a cached positive dentry. We skipped |
| 29 | * revalidation, so handle it here by dropping the dentry and returning |
| 30 | * -EOPENSTALE. The VFS will retry the lookup/create/open. |
| 31 | */ |
| 32 | |
| 33 | dprintk("NFS: open file(%s/%s)\n", |
| 34 | dentry->d_parent->d_name.name, |
| 35 | dentry->d_name.name); |
| 36 | |
| 37 | if ((openflags & O_ACCMODE) == 3) |
| 38 | openflags--; |
| 39 | |
| 40 | /* We can't create new files here */ |
| 41 | openflags &= ~(O_CREAT|O_EXCL); |
| 42 | |
| 43 | parent = dget_parent(dentry); |
| 44 | dir = parent->d_inode; |
| 45 | |
| 46 | ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode); |
| 47 | err = PTR_ERR(ctx); |
| 48 | if (IS_ERR(ctx)) |
| 49 | goto out; |
| 50 | |
| 51 | attr.ia_valid = ATTR_OPEN; |
| 52 | if (openflags & O_TRUNC) { |
| 53 | attr.ia_valid |= ATTR_SIZE; |
| 54 | attr.ia_size = 0; |
| 55 | nfs_wb_all(inode); |
| 56 | } |
| 57 | |
| 58 | inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr); |
| 59 | if (IS_ERR(inode)) { |
| 60 | err = PTR_ERR(inode); |
| 61 | switch (err) { |
| 62 | case -EPERM: |
| 63 | case -EACCES: |
| 64 | case -EDQUOT: |
| 65 | case -ENOSPC: |
| 66 | case -EROFS: |
| 67 | goto out_put_ctx; |
| 68 | default: |
| 69 | goto out_drop; |
| 70 | } |
| 71 | } |
| 72 | iput(inode); |
| 73 | if (inode != dentry->d_inode) |
| 74 | goto out_drop; |
| 75 | |
| 76 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 77 | nfs_file_set_open_context(filp, ctx); |
| 78 | err = 0; |
| 79 | |
| 80 | out_put_ctx: |
| 81 | put_nfs_open_context(ctx); |
| 82 | out: |
| 83 | dput(parent); |
| 84 | return err; |
| 85 | |
| 86 | out_drop: |
| 87 | d_drop(dentry); |
| 88 | err = -EOPENSTALE; |
| 89 | goto out_put_ctx; |
| 90 | } |
| 91 | |
| 92 | static int |
| 93 | nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
| 94 | { |
| 95 | int ret; |
| 96 | struct inode *inode = file->f_path.dentry->d_inode; |
| 97 | |
| 98 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| 99 | mutex_lock(&inode->i_mutex); |
| 100 | ret = nfs_file_fsync_commit(file, start, end, datasync); |
| 101 | if (!ret && !datasync) |
| 102 | /* application has asked for meta-data sync */ |
| 103 | ret = pnfs_layoutcommit_inode(inode, true); |
| 104 | mutex_unlock(&inode->i_mutex); |
| 105 | |
| 106 | return ret; |
| 107 | } |
| 108 | |
| 109 | const struct file_operations nfs4_file_operations = { |
| 110 | .llseek = nfs_file_llseek, |
| 111 | .read = do_sync_read, |
| 112 | .write = do_sync_write, |
| 113 | .aio_read = nfs_file_read, |
| 114 | .aio_write = nfs_file_write, |
| 115 | .mmap = nfs_file_mmap, |
| 116 | .open = nfs4_file_open, |
| 117 | .flush = nfs_file_flush, |
| 118 | .release = nfs_file_release, |
| 119 | .fsync = nfs4_file_fsync, |
| 120 | .lock = nfs_lock, |
| 121 | .flock = nfs_flock, |
| 122 | .splice_read = nfs_file_splice_read, |
| 123 | .splice_write = nfs_file_splice_write, |
| 124 | .check_flags = nfs_check_flags, |
| 125 | .setlease = nfs_setlease, |
| 126 | }; |