b4d0d230ccfb5 (Thomas Gleixner 2019-05-20 19:08:01 +0200 1) // SPDX-License-Identifier: GPL-2.0-or-later
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 2) /* AFS silly rename handling
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 3) *
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 4) * Copyright (C) 2019 Red Hat, Inc. All Rights Reserved.
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 5) * Written by David Howells (dhowells@redhat.com)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 6) * - Derived from NFS's sillyrename.
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 7) */
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 8)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 9) #include <linux/kernel.h>
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 10) #include <linux/fs.h>
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 11) #include <linux/namei.h>
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 12) #include <linux/fsnotify.h>
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 13) #include "internal.h"
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 14)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 15) static void afs_silly_rename_success(struct afs_operation *op)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 16) {
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 17) _enter("op=%08x", op->debug_id);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 18)
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 19) afs_check_dir_conflict(op, &op->file[0]);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 20) afs_vnode_commit_status(op, &op->file[0]);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 21) }
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 22)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 23) static void afs_silly_rename_edit_dir(struct afs_operation *op)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 24) {
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 25) struct afs_vnode_param *dvp = &op->file[0];
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 26) struct afs_vnode *dvnode = dvp->vnode;
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 27) struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry));
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 28) struct dentry *old = op->dentry;
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 29) struct dentry *new = op->dentry_2;
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 30)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 31) spin_lock(&old->d_lock);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 32) old->d_flags |= DCACHE_NFSFS_RENAMED;
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 33) spin_unlock(&old->d_lock);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 34) if (dvnode->silly_key != op->key) {
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 35) key_put(dvnode->silly_key);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 36) dvnode->silly_key = key_get(op->key);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 37) }
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 38)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 39) down_write(&dvnode->validate_lock);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 40) if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 41) dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) {
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 42) afs_edit_dir_remove(dvnode, &old->d_name,
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 43) afs_edit_dir_for_silly_0);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 44) afs_edit_dir_add(dvnode, &new->d_name,
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 45) &vnode->fid, afs_edit_dir_for_silly_1);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 46) }
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 47) up_write(&dvnode->validate_lock);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 48) }
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 49)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 50) static const struct afs_operation_ops afs_silly_rename_operation = {
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 51) .issue_afs_rpc = afs_fs_rename,
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 52) .issue_yfs_rpc = yfs_fs_rename,
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 53) .success = afs_silly_rename_success,
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 54) .edit_dir = afs_silly_rename_edit_dir,
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 55) };
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 56)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 57) /*
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 58) * Actually perform the silly rename step.
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 59) */
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 60) static int afs_do_silly_rename(struct afs_vnode *dvnode, struct afs_vnode *vnode,
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 61) struct dentry *old, struct dentry *new,
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 62) struct key *key)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 63) {
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 64) struct afs_operation *op;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 65)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 66) _enter("%pd,%pd", old, new);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 67)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 68) op = afs_alloc_operation(key, dvnode->volume);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 69) if (IS_ERR(op))
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 70) return PTR_ERR(op);
a58823ac45896 (David Howells 2019-05-09 15:16:10 +0100 71)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 72) afs_op_set_vnode(op, 0, dvnode);
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 73) afs_op_set_vnode(op, 1, dvnode);
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 74) op->file[0].dv_delta = 1;
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 75) op->file[1].dv_delta = 1;
22650f1481265 (David Howells 2021-04-30 13:47:08 +0100 76) op->file[0].modification = true;
22650f1481265 (David Howells 2021-04-30 13:47:08 +0100 77) op->file[1].modification = true;
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 78) op->file[0].update_ctime = true;
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 79) op->file[1].update_ctime = true;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 80)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 81) op->dentry = old;
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 82) op->dentry_2 = new;
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 83) op->ops = &afs_silly_rename_operation;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 84)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 85) trace_afs_silly_rename(vnode, false);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 86) return afs_do_sync_operation(op);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 87) }
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 88)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 89) /**
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 90) * afs_sillyrename - Perform a silly-rename of a dentry
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 91) *
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 92) * AFS is stateless and the server doesn't know when the client is holding a
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 93) * file open. To prevent application problems when a file is unlinked while
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 94) * it's still open, the client performs a "silly-rename". That is, it renames
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 95) * the file to a hidden file in the same directory, and only performs the
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 96) * unlink once the last reference to it is put.
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 97) *
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 98) * The final cleanup is done during dentry_iput.
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 99) */
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 100) int afs_sillyrename(struct afs_vnode *dvnode, struct afs_vnode *vnode,
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 101) struct dentry *dentry, struct key *key)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 102) {
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 103) static unsigned int sillycounter;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 104) struct dentry *sdentry = NULL;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 105) unsigned char silly[16];
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 106) int ret = -EBUSY;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 107)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 108) _enter("");
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 109)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 110) /* We don't allow a dentry to be silly-renamed twice. */
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 111) if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 112) return -EBUSY;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 113)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 114) sdentry = NULL;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 115) do {
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 116) int slen;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 117)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 118) dput(sdentry);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 119) sillycounter++;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 120)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 121) /* Create a silly name. Note that the ".__afs" prefix is
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 122) * understood by the salvager and must not be changed.
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 123) */
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 124) slen = scnprintf(silly, sizeof(silly), ".__afs%04X", sillycounter);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 125) sdentry = lookup_one_len(silly, dentry->d_parent, slen);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 126)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 127) /* N.B. Better to return EBUSY here ... it could be dangerous
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 128) * to delete the file while it's in use.
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 129) */
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 130) if (IS_ERR(sdentry))
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 131) goto out;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 132) } while (!d_is_negative(sdentry));
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 133)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 134) ihold(&vnode->vfs_inode);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 135)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 136) ret = afs_do_silly_rename(dvnode, vnode, dentry, sdentry, key);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 137) switch (ret) {
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 138) case 0:
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 139) /* The rename succeeded. */
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 140) set_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 141) d_move(dentry, sdentry);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 142) break;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 143) case -ERESTARTSYS:
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 144) /* The result of the rename is unknown. Play it safe by forcing
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 145) * a new lookup.
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 146) */
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 147) d_drop(dentry);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 148) d_drop(sdentry);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 149) }
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 150)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 151) iput(&vnode->vfs_inode);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 152) dput(sdentry);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 153) out:
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 154) _leave(" = %d", ret);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 155) return ret;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 156) }
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 157)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 158) static void afs_silly_unlink_success(struct afs_operation *op)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 159) {
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 160) _enter("op=%08x", op->debug_id);
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 161) afs_check_dir_conflict(op, &op->file[0]);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 162) afs_vnode_commit_status(op, &op->file[0]);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 163) afs_vnode_commit_status(op, &op->file[1]);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 164) afs_update_dentry_version(op, &op->file[0], op->dentry);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 165) }
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 166)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 167) static void afs_silly_unlink_edit_dir(struct afs_operation *op)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 168) {
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 169) struct afs_vnode_param *dvp = &op->file[0];
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 170) struct afs_vnode *dvnode = dvp->vnode;
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 171)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 172) _enter("op=%08x", op->debug_id);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 173) down_write(&dvnode->validate_lock);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 174) if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 175) dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 176) afs_edit_dir_remove(dvnode, &op->dentry->d_name,
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 177) afs_edit_dir_for_unlink);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 178) up_write(&dvnode->validate_lock);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 179) }
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 180)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 181) static const struct afs_operation_ops afs_silly_unlink_operation = {
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 182) .issue_afs_rpc = afs_fs_remove_file,
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 183) .issue_yfs_rpc = yfs_fs_remove_file,
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 184) .success = afs_silly_unlink_success,
728279a5a1fd9 (David Howells 2020-06-16 00:34:09 +0100 185) .aborted = afs_check_for_remote_deletion,
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 186) .edit_dir = afs_silly_unlink_edit_dir,
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 187) };
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 188)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 189) /*
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 190) * Tell the server to remove a sillyrename file.
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 191) */
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 192) static int afs_do_silly_unlink(struct afs_vnode *dvnode, struct afs_vnode *vnode,
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 193) struct dentry *dentry, struct key *key)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 194) {
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 195) struct afs_operation *op;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 196)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 197) _enter("");
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 198)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 199) op = afs_alloc_operation(NULL, dvnode->volume);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 200) if (IS_ERR(op))
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 201) return PTR_ERR(op);
a58823ac45896 (David Howells 2019-05-09 15:16:10 +0100 202)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 203) afs_op_set_vnode(op, 0, dvnode);
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 204) afs_op_set_vnode(op, 1, vnode);
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 205) op->file[0].dv_delta = 1;
22650f1481265 (David Howells 2021-04-30 13:47:08 +0100 206) op->file[0].modification = true;
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 207) op->file[0].update_ctime = true;
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 208) op->file[1].op_unlinked = true;
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 209) op->file[1].update_ctime = true;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 210)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 211) op->dentry = dentry;
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 212) op->ops = &afs_silly_unlink_operation;
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 213)
e49c7b2f6de7f (David Howells 2020-04-10 20:51:51 +0100 214) trace_afs_silly_rename(vnode, true);
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 215) afs_begin_vnode_operation(op);
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 216) afs_wait_for_operation(op);
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 217)
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 218) /* If there was a conflict with a third party, check the status of the
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 219) * unlinked vnode.
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 220) */
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 221) if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 222) op->file[1].update_ctime = false;
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 223) op->fetch_status.which = 1;
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 224) op->ops = &afs_fetch_status_operation;
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 225) afs_begin_vnode_operation(op);
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 226) afs_wait_for_operation(op);
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 227) }
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 228)
b6489a49f7b71 (David Howells 2020-06-15 17:36:58 +0100 229) return afs_put_operation(op);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 230) }
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 231)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 232) /*
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 233) * Remove sillyrename file on iput.
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 234) */
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 235) int afs_silly_iput(struct dentry *dentry, struct inode *inode)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 236) {
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 237) struct afs_vnode *dvnode = AFS_FS_I(d_inode(dentry->d_parent));
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 238) struct afs_vnode *vnode = AFS_FS_I(inode);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 239) struct dentry *alias;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 240) int ret;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 241)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 242) DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 243)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 244) _enter("%p{%pd},%llx", dentry, dentry, vnode->fid.vnode);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 245)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 246) down_read(&dvnode->rmdir_lock);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 247)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 248) alias = d_alloc_parallel(dentry->d_parent, &dentry->d_name, &wq);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 249) if (IS_ERR(alias)) {
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 250) up_read(&dvnode->rmdir_lock);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 251) return 0;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 252) }
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 253)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 254) if (!d_in_lookup(alias)) {
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 255) /* We raced with lookup... See if we need to transfer the
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 256) * sillyrename information to the aliased dentry.
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 257) */
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 258) ret = 0;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 259) spin_lock(&alias->d_lock);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 260) if (d_really_is_positive(alias) &&
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 261) !(alias->d_flags & DCACHE_NFSFS_RENAMED)) {
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 262) alias->d_flags |= DCACHE_NFSFS_RENAMED;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 263) ret = 1;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 264) }
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 265) spin_unlock(&alias->d_lock);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 266) up_read(&dvnode->rmdir_lock);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 267) dput(alias);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 268) return ret;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 269) }
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 270)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 271) /* Stop lock-release from complaining. */
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 272) spin_lock(&vnode->lock);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 273) vnode->lock_state = AFS_VNODE_LOCK_DELETED;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 274) trace_afs_flock_ev(vnode, NULL, afs_flock_silly_delete, 0);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 275) spin_unlock(&vnode->lock);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 276)
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 277) afs_do_silly_unlink(dvnode, vnode, dentry, dvnode->silly_key);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 278) up_read(&dvnode->rmdir_lock);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 279) d_lookup_done(alias);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 280) dput(alias);
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 281) return 1;
79ddbfa500b37 (David Howells 2019-04-25 14:26:51 +0100 282) }
VisionFive2 Linux kernel
StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)
More than 9999 Commits
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