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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 66/67] cachefiles: Add error injection support From: David Howells To: linux-cachefs@redhat.com Cc: dhowells@redhat.com, Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet , Jeff Layton , Matthew Wilcox , Alexander Viro , Omar Sandoval , Linus Torvalds , linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 18 Oct 2021 16:08:57 +0100 Message-ID: <163456973776.2614702.12301119633219400267.stgit@warthog.procyon.org.uk> In-Reply-To: <163456861570.2614702.14754548462706508617.stgit@warthog.procyon.org.uk> References: <163456861570.2614702.14754548462706508617.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Add support for injecting ENOSPC or EIO errors. This needs to be enabled by CONFIG_CACHEFILES_ERROR_INJECTION=y. Once enabled, ENOSPC on things like write and mkdir can be triggered by: echo 1 >/proc/sys/cachefiles/error_injection and EIO can be triggered on most operations by: echo 2 >/proc/sys/cachefiles/error_injection Signed-off-by: David Howells --- fs/cachefiles/Kconfig | 8 ++++++ fs/cachefiles/Makefile | 2 + fs/cachefiles/error_inject.c | 46 ++++++++++++++++++++++++++++++++++ fs/cachefiles/interface.c | 21 +++++++++++---- fs/cachefiles/internal.h | 39 +++++++++++++++++++++++++++++ fs/cachefiles/io.c | 34 ++++++++++++++++++------- fs/cachefiles/main.c | 7 +++++ fs/cachefiles/namei.c | 57 +++++++++++++++++++++++++++++++++--------- fs/cachefiles/xattr.c | 14 +++++++--- 9 files changed, 197 insertions(+), 31 deletions(-) create mode 100644 fs/cachefiles/error_inject.c diff --git a/fs/cachefiles/Kconfig b/fs/cachefiles/Kconfig index 6827b40f7ddc..c19515dd253e 100644 --- a/fs/cachefiles/Kconfig +++ b/fs/cachefiles/Kconfig @@ -19,3 +19,11 @@ config CACHEFILES_DEBUG caching on files module. If this is set, the debugging output may be enabled by setting bits in /sys/modules/cachefiles/parameter/debug or by including a debugging specifier in /etc/cachefilesd.conf. + + +config CACHEFILES_ERROR_INJECTION + bool "Provide error injection for cachefiles" + depends on CACHEFILES && SYSCTL + help + This permits error injection to be enabled in cachefiles whilst a + cache is in service. diff --git a/fs/cachefiles/Makefile b/fs/cachefiles/Makefile index 9062767331e8..c0df4c42cb09 100644 --- a/fs/cachefiles/Makefile +++ b/fs/cachefiles/Makefile @@ -15,4 +15,6 @@ cachefiles-y := \ volume.o \ xattr.o +cachefiles-$(CONFIG_CACHEFILES_ERROR_INJECTION) += error_inject.o + obj-$(CONFIG_CACHEFILES) := cachefiles.o diff --git a/fs/cachefiles/error_inject.c b/fs/cachefiles/error_inject.c new file mode 100644 index 000000000000..58f8aec964e4 --- /dev/null +++ b/fs/cachefiles/error_inject.c @@ -0,0 +1,46 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Error injection handling. + * + * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#include +#include "internal.h" + +unsigned int cachefiles_error_injection_state; + +static struct ctl_table_header *cachefiles_sysctl; +static struct ctl_table cachefiles_sysctls[] = { + { + .procname = "error_injection", + .data = &cachefiles_error_injection_state, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_douintvec, + }, + {} +}; + +static struct ctl_table cachefiles_sysctls_root[] = { + { + .procname = "cachefiles", + .mode = 0555, + .child = cachefiles_sysctls, + }, + {} +}; + +int __init cachefiles_register_error_injection(void) +{ + cachefiles_sysctl = register_sysctl_table(cachefiles_sysctls_root); + if (!cachefiles_sysctl) + return -ENOMEM; + return 0; + +} + +void cachefiles_unregister_error_injection(void) +{ + unregister_sysctl_table(cachefiles_sysctl); +} diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c index 115be503b23a..3c9710ceae86 100644 --- a/fs/cachefiles/interface.c +++ b/fs/cachefiles/interface.c @@ -151,7 +151,9 @@ static bool cachefiles_shorten_object(struct cachefiles_object *object, trace_cachefiles_trunc(object, inode, i_size, dio_size, cachefiles_trunc_shrink); - ret = vfs_truncate(&file->f_path, dio_size); + ret = cachefiles_inject_remove_error(); + if (ret == 0) + ret = vfs_truncate(&file->f_path, dio_size); if (ret < 0) { trace_cachefiles_io_error(object, file_inode(file), ret, cachefiles_trace_trunc_error); @@ -163,8 +165,10 @@ static bool cachefiles_shorten_object(struct cachefiles_object *object, if (new_size < dio_size) { trace_cachefiles_trunc(object, inode, dio_size, new_size, cachefiles_trunc_dio_adjust); - ret = vfs_fallocate(file, FALLOC_FL_ZERO_RANGE, - new_size, dio_size); + ret = cachefiles_inject_write_error(); + if (ret == 0) + ret = vfs_fallocate(file, FALLOC_FL_ZERO_RANGE, + new_size, dio_size); if (ret < 0) { trace_cachefiles_io_error(object, file_inode(file), ret, cachefiles_trace_fallocate_error); @@ -374,15 +378,20 @@ static int cachefiles_attr_changed(struct cachefiles_object *object) _debug("discard tail %llx", oi_size); newattrs.ia_valid = ATTR_SIZE; newattrs.ia_size = oi_size & PAGE_MASK; - ret = notify_change(&init_user_ns, file->f_path.dentry, - &newattrs, NULL); + ret = cachefiles_inject_remove_error(); + if (ret == 0) + ret = notify_change(&init_user_ns, file->f_path.dentry, + &newattrs, NULL); if (ret < 0) goto truncate_failed; } newattrs.ia_valid = ATTR_SIZE; newattrs.ia_size = ni_size; - ret = notify_change(&init_user_ns, file->f_path.dentry, &newattrs, NULL); + ret = cachefiles_inject_write_error(); + if (ret == 0) + ret = notify_change(&init_user_ns, file->f_path.dentry, + &newattrs, NULL); truncate_failed: inode_unlock(file_inode(file)); diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h index 3dd3e13989d6..096ee6376f2a 100644 --- a/fs/cachefiles/internal.h +++ b/fs/cachefiles/internal.h @@ -155,6 +155,45 @@ extern const struct file_operations cachefiles_daemon_fops; extern int cachefiles_has_space(struct cachefiles_cache *cache, unsigned fnr, unsigned bnr); +/* + * error_inject.c + */ +#ifdef CONFIG_CACHEFILES_ERROR_INJECTION +extern unsigned int cachefiles_error_injection_state; +extern int cachefiles_register_error_injection(void); +extern void cachefiles_unregister_error_injection(void); + +#else +#define cachefiles_error_injection_state 0 + +static inline int cachefiles_register_error_injection(void) +{ + return 0; +} + +static inline void cachefiles_unregister_error_injection(void) +{ +} +#endif + + +static inline int cachefiles_inject_read_error(void) +{ + return cachefiles_error_injection_state & 2 ? -EIO : 0; +} + +static inline int cachefiles_inject_write_error(void) +{ + return cachefiles_error_injection_state & 2 ? -EIO : + cachefiles_error_injection_state & 1 ? -ENOSPC : + 0; +} + +static inline int cachefiles_inject_remove_error(void) +{ + return cachefiles_error_injection_state & 2 ? -EIO : 0; +} + /* * interface.c */ diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c index 136d0ea0a7c9..78e6ef781f73 100644 --- a/fs/cachefiles/io.c +++ b/fs/cachefiles/io.c @@ -100,7 +100,9 @@ static int cachefiles_read(struct netfs_cache_resources *cres, if (read_hole != NETFS_READ_HOLE_IGNORE) { loff_t off = start_pos, off2; - off2 = vfs_llseek(file, off, SEEK_DATA); + off2 = cachefiles_inject_read_error(); + if (off2 == 0) + off2 = vfs_llseek(file, off, SEEK_DATA); if (off2 < 0 && off2 >= (loff_t)-MAX_ERRNO && off2 != -ENXIO) { skipped = 0; ret = off2; @@ -152,7 +154,9 @@ static int cachefiles_read(struct netfs_cache_resources *cres, trace_cachefiles_read(object, file_inode(file), ki->iocb.ki_pos, len - skipped); old_nofs = memalloc_nofs_save(); - ret = vfs_iocb_iter_read(file, &ki->iocb, iter); + ret = cachefiles_inject_read_error(); + if (ret == 0) + ret = vfs_iocb_iter_read(file, &ki->iocb, iter); memalloc_nofs_restore(old_nofs); switch (ret) { case -EIOCBQUEUED: @@ -273,7 +277,9 @@ static int cachefiles_write(struct netfs_cache_resources *cres, trace_cachefiles_write(object, inode, ki->iocb.ki_pos, len); old_nofs = memalloc_nofs_save(); - ret = vfs_iocb_iter_write(file, &ki->iocb, iter); + ret = cachefiles_inject_write_error(); + if (ret == 0) + ret = vfs_iocb_iter_write(file, &ki->iocb, iter); memalloc_nofs_restore(old_nofs); switch (ret) { case -EIOCBQUEUED: @@ -355,7 +361,9 @@ static enum netfs_read_source cachefiles_prepare_read(struct netfs_read_subreque cache = object->volume->cache; cachefiles_begin_secure(cache, &saved_cred); - off = vfs_llseek(file, subreq->start, SEEK_DATA); + off = cachefiles_inject_read_error(); + if (off == 0) + off = vfs_llseek(file, subreq->start, SEEK_DATA); if (off < 0 && off >= (loff_t)-MAX_ERRNO) { if (off == (loff_t)-ENXIO) { why = cachefiles_trace_read_seek_nxio; @@ -379,7 +387,9 @@ static enum netfs_read_source cachefiles_prepare_read(struct netfs_read_subreque goto download_and_store; } - to = vfs_llseek(file, subreq->start, SEEK_HOLE); + to = cachefiles_inject_read_error(); + if (to == 0) + to = vfs_llseek(file, subreq->start, SEEK_HOLE); if (to < 0 && to >= (loff_t)-MAX_ERRNO) { trace_cachefiles_io_error(object, file_inode(file), to, cachefiles_trace_seek_error); @@ -434,7 +444,9 @@ static int __cachefiles_prepare_write(struct netfs_cache_resources *cres, if (no_space_allocated_yet) goto check_space; - pos = vfs_llseek(file, *_start, SEEK_DATA); + pos = cachefiles_inject_read_error(); + if (pos == 0) + pos = vfs_llseek(file, *_start, SEEK_DATA); if (pos < 0 && pos >= (loff_t)-MAX_ERRNO) { if (pos == -ENXIO) goto check_space; /* Unallocated tail */ @@ -452,7 +464,9 @@ static int __cachefiles_prepare_write(struct netfs_cache_resources *cres, if (cachefiles_has_space(cache, 0, *_len / PAGE_SIZE) == 0) return 0; /* Enough space to simply overwrite the whole block */ - pos = vfs_llseek(file, *_start, SEEK_HOLE); + pos = cachefiles_inject_read_error(); + if (pos == 0) + pos = vfs_llseek(file, *_start, SEEK_HOLE); if (pos < 0 && pos >= (loff_t)-MAX_ERRNO) { trace_cachefiles_io_error(object, file_inode(file), pos, cachefiles_trace_seek_error); @@ -462,8 +476,10 @@ static int __cachefiles_prepare_write(struct netfs_cache_resources *cres, return 0; /* Fully allocated */ /* Partially allocated, but insufficient space: cull. */ - ret = vfs_fallocate(file, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, - *_start, *_len); + pos = cachefiles_inject_remove_error(); + if (pos == 0) + ret = vfs_fallocate(file, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, + *_start, *_len); if (ret < 0) { trace_cachefiles_io_error(object, file_inode(file), ret, cachefiles_trace_fallocate_error); diff --git a/fs/cachefiles/main.c b/fs/cachefiles/main.c index 522fda828563..83f8a221a890 100644 --- a/fs/cachefiles/main.c +++ b/fs/cachefiles/main.c @@ -46,6 +46,10 @@ static int __init cachefiles_init(void) { int ret; + ret = cachefiles_register_error_injection(); + if (ret < 0) + goto error_einj; + ret = misc_register(&cachefiles_dev); if (ret < 0) goto error_dev; @@ -67,6 +71,8 @@ static int __init cachefiles_init(void) error_object_jar: misc_deregister(&cachefiles_dev); error_dev: + cachefiles_unregister_error_injection(); +error_einj: pr_err("failed to register: %d\n", ret); return ret; } @@ -82,6 +88,7 @@ static void __exit cachefiles_exit(void) kmem_cache_destroy(cachefiles_object_jar); misc_deregister(&cachefiles_dev); + cachefiles_unregister_error_injection(); } module_exit(cachefiles_exit); diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c index 12266c90e5f8..686480120570 100644 --- a/fs/cachefiles/namei.c +++ b/fs/cachefiles/namei.c @@ -116,7 +116,9 @@ int cachefiles_bury_object(struct cachefiles_cache *cache, dget(rep); /* Stop the dentry being negated if it's * only pinned by a file struct. */ - ret = vfs_unlink(&init_user_ns, d_inode(dir), rep, NULL); + ret = cachefiles_inject_remove_error(); + if (ret == 0) + ret = vfs_unlink(&init_user_ns, d_inode(dir), rep, NULL); dput(rep); } @@ -230,7 +232,9 @@ int cachefiles_bury_object(struct cachefiles_cache *cache, .new_dentry = grave, }; trace_cachefiles_rename(object, rep, grave, why); - ret = vfs_rename(&rd); + ret = cachefiles_inject_read_error(); + if (ret == 0) + ret = vfs_rename(&rd); if (ret != 0) trace_cachefiles_vfs_error(object, d_inode(dir), PTR_ERR(grave), @@ -258,6 +262,8 @@ static int cachefiles_unlink(struct cachefiles_object *object, trace_cachefiles_unlink(object, dentry, why); ret = security_path_unlink(&path, dentry); + if (ret == 0) + ret = cachefiles_inject_remove_error(); if (ret == 0) ret = vfs_unlink(&init_user_ns, d_backing_inode(fan), dentry, NULL); if (ret != 0) @@ -400,7 +406,12 @@ bool cachefiles_look_up_object(struct cachefiles_object *object) _enter("OBJ%x,%s,", object->debug_id, object->d_name); /* Look up path "cache/vol/fanout/file". */ - dentry = lookup_positive_unlocked(object->d_name, fan, object->d_name_len); + ret = cachefiles_inject_read_error(); + if (ret == 0) + dentry = lookup_positive_unlocked(object->d_name, fan, + object->d_name_len); + else + dentry = ERR_PTR(ret); trace_cachefiles_lookup(object, dentry); if (IS_ERR(dentry)) { if (dentry == ERR_PTR(-ENOENT)) @@ -449,7 +460,11 @@ struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache, inode_lock(d_inode(dir)); retry: - subdir = lookup_one_len(dirname, dir, strlen(dirname)); + ret = cachefiles_inject_read_error(); + if (ret == 0) + subdir = lookup_one_len(dirname, dir, strlen(dirname)); + else + subdir = ERR_PTR(ret); if (IS_ERR(subdir)) { trace_cachefiles_vfs_error(NULL, d_backing_inode(dir), PTR_ERR(subdir), @@ -477,7 +492,9 @@ struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache, ret = security_path_mkdir(&path, subdir, 0700); if (ret < 0) goto mkdir_error; - ret = vfs_mkdir(&init_user_ns, d_inode(dir), subdir, 0700); + ret = cachefiles_inject_write_error(); + if (ret == 0) + ret = vfs_mkdir(&init_user_ns, d_inode(dir), subdir, 0700); if (ret < 0) { trace_cachefiles_vfs_error(NULL, d_inode(dir), ret, cachefiles_trace_mkdir_error); @@ -717,8 +734,12 @@ struct file *cachefiles_create_tmpfile(struct cachefiles_object *object) cachefiles_begin_secure(cache, &saved_cred); - path.mnt = cache->mnt, - path.dentry = vfs_tmpfile(&init_user_ns, fan, S_IFREG, O_RDWR); + path.mnt = cache->mnt; + ret = cachefiles_inject_write_error(); + if (ret == 0) + path.dentry = vfs_tmpfile(&init_user_ns, fan, S_IFREG, O_RDWR); + else + path.dentry = ERR_PTR(ret); if (IS_ERR(path.dentry)) { trace_cachefiles_vfs_error(object, d_inode(fan), PTR_ERR(path.dentry), cachefiles_trace_tmpfile_error); @@ -738,7 +759,9 @@ struct file *cachefiles_create_tmpfile(struct cachefiles_object *object) if (ni_size > 0) { trace_cachefiles_trunc(object, d_backing_inode(path.dentry), 0, ni_size, cachefiles_trunc_expand_tmpfile); - ret = vfs_truncate(&path, ni_size); + ret = cachefiles_inject_write_error(); + if (ret == 0) + ret = vfs_truncate(&path, ni_size); if (ret < 0) { trace_cachefiles_vfs_error( object, d_backing_inode(path.dentry), ret, @@ -784,7 +807,11 @@ bool cachefiles_commit_tmpfile(struct cachefiles_cache *cache, _enter(",%pD", object->file); inode_lock_nested(d_inode(fan), I_MUTEX_PARENT); - dentry = lookup_one_len(object->d_name, fan, object->d_name_len); + ret = cachefiles_inject_read_error(); + if (ret == 0) + dentry = lookup_one_len(object->d_name, fan, object->d_name_len); + else + dentry = ERR_PTR(ret); if (IS_ERR(dentry)) { trace_cachefiles_vfs_error(object, d_inode(fan), PTR_ERR(dentry), cachefiles_trace_lookup_error); @@ -806,7 +833,11 @@ bool cachefiles_commit_tmpfile(struct cachefiles_cache *cache, } dput(dentry); - dentry = lookup_one_len(object->d_name, fan, object->d_name_len); + ret = cachefiles_inject_read_error(); + if (ret == 0) + dentry = lookup_one_len(object->d_name, fan, object->d_name_len); + else + dentry = ERR_PTR(ret); if (IS_ERR(dentry)) { trace_cachefiles_vfs_error(object, d_inode(fan), PTR_ERR(dentry), cachefiles_trace_lookup_error); @@ -815,8 +846,10 @@ bool cachefiles_commit_tmpfile(struct cachefiles_cache *cache, } } - ret = vfs_link(object->file->f_path.dentry, &init_user_ns, - d_inode(fan), dentry, NULL); + ret = cachefiles_inject_read_error(); + if (ret == 0) + ret = vfs_link(object->file->f_path.dentry, &init_user_ns, + d_inode(fan), dentry, NULL); if (ret < 0) { trace_cachefiles_vfs_error(object, d_inode(fan), PTR_ERR(dentry), cachefiles_trace_link_error); diff --git a/fs/cachefiles/xattr.c b/fs/cachefiles/xattr.c index e0f77329c3ec..2555b82be7e2 100644 --- a/fs/cachefiles/xattr.c +++ b/fs/cachefiles/xattr.c @@ -58,8 +58,10 @@ int cachefiles_set_object_xattr(struct cachefiles_object *object) if (len > 0) memcpy(buf->data, fscache_get_aux(object->cookie), len); - ret = vfs_setxattr(&init_user_ns, dentry, cachefiles_xattr_cache, - buf, sizeof(struct cachefiles_xattr) + len, 0); + ret = cachefiles_inject_write_error(); + if (ret == 0) + ret = vfs_setxattr(&init_user_ns, dentry, cachefiles_xattr_cache, + buf, sizeof(struct cachefiles_xattr) + len, 0); if (ret < 0) { trace_cachefiles_vfs_error(object, file_inode(file), ret, cachefiles_trace_setxattr_error); @@ -99,7 +101,9 @@ int cachefiles_check_auxdata(struct cachefiles_object *object, struct file *file if (!buf) return -ENOMEM; - xlen = vfs_getxattr(&init_user_ns, dentry, cachefiles_xattr_cache, buf, tlen); + xlen = cachefiles_inject_read_error(); + if (xlen == 0) + xlen = vfs_getxattr(&init_user_ns, dentry, cachefiles_xattr_cache, buf, tlen); if (xlen != tlen) { if (xlen < 0) trace_cachefiles_vfs_error(object, file_inode(file), xlen, @@ -139,7 +143,9 @@ int cachefiles_remove_object_xattr(struct cachefiles_cache *cache, { int ret; - ret = vfs_removexattr(&init_user_ns, dentry, cachefiles_xattr_cache); + ret = cachefiles_inject_remove_error(); + if (ret == 0) + ret = vfs_removexattr(&init_user_ns, dentry, cachefiles_xattr_cache); if (ret < 0) { trace_cachefiles_vfs_error(object, d_inode(dentry), ret, cachefiles_trace_remxattr_error);