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file.c
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// SPDX-License-Identifier: GPL-2.0
#include <linux/ceph/ceph_debug.h>
#include <linux/ceph/striper.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/writeback.h>
#include <linux/falloc.h>
#include <linux/iversion.h>
#include "super.h"
#include "mds_client.h"
#include "cache.h"
#include "io.h"
static __le32 ceph_flags_sys2wire(u32 flags)
{
u32 wire_flags = 0;
switch (flags & O_ACCMODE) {
case O_RDONLY:
wire_flags |= CEPH_O_RDONLY;
break;
case O_WRONLY:
wire_flags |= CEPH_O_WRONLY;
break;
case O_RDWR:
wire_flags |= CEPH_O_RDWR;
break;
}
flags &= ~O_ACCMODE;
#define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
ceph_sys2wire(O_CREAT);
ceph_sys2wire(O_EXCL);
ceph_sys2wire(O_TRUNC);
ceph_sys2wire(O_DIRECTORY);
ceph_sys2wire(O_NOFOLLOW);
#undef ceph_sys2wire
if (flags)
dout("unused open flags: %x\n", flags);
return cpu_to_le32(wire_flags);
}
/*
* Ceph file operations
*
* Implement basic open/close functionality, and implement
* read/write.
*
* We implement three modes of file I/O:
* - buffered uses the generic_file_aio_{read,write} helpers
*
* - synchronous is used when there is multi-client read/write
* sharing, avoids the page cache, and synchronously waits for an
* ack from the OSD.
*
* - direct io takes the variant of the sync path that references
* user pages directly.
*
* fsync() flushes and waits on dirty pages, but just queues metadata
* for writeback: since the MDS can recover size and mtime there is no
* need to wait for MDS acknowledgement.
*/
/*
* How many pages to get in one call to iov_iter_get_pages(). This
* determines the size of the on-stack array used as a buffer.
*/
#define ITER_GET_BVECS_PAGES 64
static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize,
struct bio_vec *bvecs)
{
size_t size = 0;
int bvec_idx = 0;
if (maxsize > iov_iter_count(iter))
maxsize = iov_iter_count(iter);
while (size < maxsize) {
struct page *pages[ITER_GET_BVECS_PAGES];
ssize_t bytes;
size_t start;
int idx = 0;
bytes = iov_iter_get_pages(iter, pages, maxsize - size,
ITER_GET_BVECS_PAGES, &start);
if (bytes < 0)
return size ?: bytes;
iov_iter_advance(iter, bytes);
size += bytes;
for ( ; bytes; idx++, bvec_idx++) {
struct bio_vec bv = {
.bv_page = pages[idx],
.bv_len = min_t(int, bytes, PAGE_SIZE - start),
.bv_offset = start,
};
bvecs[bvec_idx] = bv;
bytes -= bv.bv_len;
start = 0;
}
}
return size;
}
/*
* iov_iter_get_pages() only considers one iov_iter segment, no matter
* what maxsize or maxpages are given. For ITER_BVEC that is a single
* page.
*
* Attempt to get up to @maxsize bytes worth of pages from @iter.
* Return the number of bytes in the created bio_vec array, or an error.
*/
static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize,
struct bio_vec **bvecs, int *num_bvecs)
{
struct bio_vec *bv;
size_t orig_count = iov_iter_count(iter);
ssize_t bytes;
int npages;
iov_iter_truncate(iter, maxsize);
npages = iov_iter_npages(iter, INT_MAX);
iov_iter_reexpand(iter, orig_count);
/*
* __iter_get_bvecs() may populate only part of the array -- zero it
* out.
*/
bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO);
if (!bv)
return -ENOMEM;
bytes = __iter_get_bvecs(iter, maxsize, bv);
if (bytes < 0) {
/*
* No pages were pinned -- just free the array.
*/
kvfree(bv);
return bytes;
}
*bvecs = bv;
*num_bvecs = npages;
return bytes;
}
static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty)
{
int i;
for (i = 0; i < num_bvecs; i++) {
if (bvecs[i].bv_page) {
if (should_dirty)
set_page_dirty_lock(bvecs[i].bv_page);
put_page(bvecs[i].bv_page);
}
}
kvfree(bvecs);
}
/*
* Prepare an open request. Preallocate ceph_cap to avoid an
* inopportune ENOMEM later.
*/
static struct ceph_mds_request *
prepare_open_request(struct super_block *sb, int flags, int create_mode)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
struct ceph_mds_client *mdsc = fsc->mdsc;
struct ceph_mds_request *req;
int want_auth = USE_ANY_MDS;
int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
want_auth = USE_AUTH_MDS;
req = ceph_mdsc_create_request(mdsc, op, want_auth);
if (IS_ERR(req))
goto out;
req->r_fmode = ceph_flags_to_mode(flags);
req->r_args.open.flags = ceph_flags_sys2wire(flags);
req->r_args.open.mode = cpu_to_le32(create_mode);
out:
return req;
}
static int ceph_init_file_info(struct inode *inode, struct file *file,
int fmode, bool isdir)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_file_info *fi;
dout("%s %p %p 0%o (%s)\n", __func__, inode, file,
inode->i_mode, isdir ? "dir" : "regular");
BUG_ON(inode->i_fop->release != ceph_release);
if (isdir) {
struct ceph_dir_file_info *dfi =
kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL);
if (!dfi)
return -ENOMEM;
file->private_data = dfi;
fi = &dfi->file_info;
dfi->next_offset = 2;
dfi->readdir_cache_idx = -1;
} else {
fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
if (!fi)
return -ENOMEM;
file->private_data = fi;
}
ceph_get_fmode(ci, fmode, 1);
fi->fmode = fmode;
spin_lock_init(&fi->rw_contexts_lock);
INIT_LIST_HEAD(&fi->rw_contexts);
fi->meta_err = errseq_sample(&ci->i_meta_err);
fi->filp_gen = READ_ONCE(ceph_inode_to_client(inode)->filp_gen);
return 0;
}
/*
* initialize private struct file data.
* if we fail, clean up by dropping fmode reference on the ceph_inode
*/
static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
{
int ret = 0;
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
ceph_fscache_register_inode_cookie(inode);
ceph_fscache_file_set_cookie(inode, file);
/* fall through */
case S_IFDIR:
ret = ceph_init_file_info(inode, file, fmode,
S_ISDIR(inode->i_mode));
if (ret)
return ret;
break;
case S_IFLNK:
dout("init_file %p %p 0%o (symlink)\n", inode, file,
inode->i_mode);
break;
default:
dout("init_file %p %p 0%o (special)\n", inode, file,
inode->i_mode);
/*
* we need to drop the open ref now, since we don't
* have .release set to ceph_release.
*/
BUG_ON(inode->i_fop->release == ceph_release);
/* call the proper open fop */
ret = inode->i_fop->open(inode, file);
}
return ret;
}
/*
* try renew caps after session gets killed.
*/
int ceph_renew_caps(struct inode *inode, int fmode)
{
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_mds_request *req;
int err, flags, wanted;
spin_lock(&ci->i_ceph_lock);
__ceph_touch_fmode(ci, mdsc, fmode);
wanted = __ceph_caps_file_wanted(ci);
if (__ceph_is_any_real_caps(ci) &&
(!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
int issued = __ceph_caps_issued(ci, NULL);
spin_unlock(&ci->i_ceph_lock);
dout("renew caps %p want %s issued %s updating mds_wanted\n",
inode, ceph_cap_string(wanted), ceph_cap_string(issued));
ceph_check_caps(ci, 0, NULL);
return 0;
}
spin_unlock(&ci->i_ceph_lock);
flags = 0;
if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
flags = O_RDWR;
else if (wanted & CEPH_CAP_FILE_RD)
flags = O_RDONLY;
else if (wanted & CEPH_CAP_FILE_WR)
flags = O_WRONLY;
#ifdef O_LAZY
if (wanted & CEPH_CAP_FILE_LAZYIO)
flags |= O_LAZY;
#endif
req = prepare_open_request(inode->i_sb, flags, 0);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto out;
}
req->r_inode = inode;
ihold(inode);
req->r_num_caps = 1;
err = ceph_mdsc_do_request(mdsc, NULL, req);
ceph_mdsc_put_request(req);
out:
dout("renew caps %p open result=%d\n", inode, err);
return err < 0 ? err : 0;
}
/*
* If we already have the requisite capabilities, we can satisfy
* the open request locally (no need to request new caps from the
* MDS). We do, however, need to inform the MDS (asynchronously)
* if our wanted caps set expands.
*/
int ceph_open(struct inode *inode, struct file *file)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
struct ceph_mds_client *mdsc = fsc->mdsc;
struct ceph_mds_request *req;
struct ceph_file_info *fi = file->private_data;
int err;
int flags, fmode, wanted;
if (fi) {
dout("open file %p is already opened\n", file);
return 0;
}
/* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
flags = file->f_flags & ~(O_CREAT|O_EXCL);
if (S_ISDIR(inode->i_mode))
flags = O_DIRECTORY; /* mds likes to know */
dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
ceph_vinop(inode), file, flags, file->f_flags);
fmode = ceph_flags_to_mode(flags);
wanted = ceph_caps_for_mode(fmode);
/* snapped files are read-only */
if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
return -EROFS;
/* trivially open snapdir */
if (ceph_snap(inode) == CEPH_SNAPDIR) {
return ceph_init_file(inode, file, fmode);
}
/*
* No need to block if we have caps on the auth MDS (for
* write) or any MDS (for read). Update wanted set
* asynchronously.
*/
spin_lock(&ci->i_ceph_lock);
if (__ceph_is_any_real_caps(ci) &&
(((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
int mds_wanted = __ceph_caps_mds_wanted(ci, true);
int issued = __ceph_caps_issued(ci, NULL);
dout("open %p fmode %d want %s issued %s using existing\n",
inode, fmode, ceph_cap_string(wanted),
ceph_cap_string(issued));
__ceph_touch_fmode(ci, mdsc, fmode);
spin_unlock(&ci->i_ceph_lock);
/* adjust wanted? */
if ((issued & wanted) != wanted &&
(mds_wanted & wanted) != wanted &&
ceph_snap(inode) != CEPH_SNAPDIR)
ceph_check_caps(ci, 0, NULL);
return ceph_init_file(inode, file, fmode);
} else if (ceph_snap(inode) != CEPH_NOSNAP &&
(ci->i_snap_caps & wanted) == wanted) {
__ceph_touch_fmode(ci, mdsc, fmode);
spin_unlock(&ci->i_ceph_lock);
return ceph_init_file(inode, file, fmode);
}
spin_unlock(&ci->i_ceph_lock);
dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
req = prepare_open_request(inode->i_sb, flags, 0);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto out;
}
req->r_inode = inode;
ihold(inode);
req->r_num_caps = 1;
err = ceph_mdsc_do_request(mdsc, NULL, req);
if (!err)
err = ceph_init_file(inode, file, req->r_fmode);
ceph_mdsc_put_request(req);
dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
out:
return err;
}
/* Clone the layout from a synchronous create, if the dir now has Dc caps */
static void
cache_file_layout(struct inode *dst, struct inode *src)
{
struct ceph_inode_info *cdst = ceph_inode(dst);
struct ceph_inode_info *csrc = ceph_inode(src);
spin_lock(&cdst->i_ceph_lock);
if ((__ceph_caps_issued(cdst, NULL) & CEPH_CAP_DIR_CREATE) &&
!ceph_file_layout_is_valid(&cdst->i_cached_layout)) {
memcpy(&cdst->i_cached_layout, &csrc->i_layout,
sizeof(cdst->i_cached_layout));
rcu_assign_pointer(cdst->i_cached_layout.pool_ns,
ceph_try_get_string(csrc->i_layout.pool_ns));
}
spin_unlock(&cdst->i_ceph_lock);
}
/*
* Try to set up an async create. We need caps, a file layout, and inode number,
* and either a lease on the dentry or complete dir info. If any of those
* criteria are not satisfied, then return false and the caller can go
* synchronous.
*/
static int try_prep_async_create(struct inode *dir, struct dentry *dentry,
struct ceph_file_layout *lo, u64 *pino)
{
struct ceph_inode_info *ci = ceph_inode(dir);
struct ceph_dentry_info *di = ceph_dentry(dentry);
int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_CREATE;
u64 ino;
spin_lock(&ci->i_ceph_lock);
/* No auth cap means no chance for Dc caps */
if (!ci->i_auth_cap)
goto no_async;
/* Any delegated inos? */
if (xa_empty(&ci->i_auth_cap->session->s_delegated_inos))
goto no_async;
if (!ceph_file_layout_is_valid(&ci->i_cached_layout))
goto no_async;
if ((__ceph_caps_issued(ci, NULL) & want) != want)
goto no_async;
if (d_in_lookup(dentry)) {
if (!__ceph_dir_is_complete(ci))
goto no_async;
spin_lock(&dentry->d_lock);
di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
spin_unlock(&dentry->d_lock);
} else if (atomic_read(&ci->i_shared_gen) !=
READ_ONCE(di->lease_shared_gen)) {
goto no_async;
}
ino = ceph_get_deleg_ino(ci->i_auth_cap->session);
if (!ino)
goto no_async;
*pino = ino;
ceph_take_cap_refs(ci, want, false);
memcpy(lo, &ci->i_cached_layout, sizeof(*lo));
rcu_assign_pointer(lo->pool_ns,
ceph_try_get_string(ci->i_cached_layout.pool_ns));
got = want;
no_async:
spin_unlock(&ci->i_ceph_lock);
return got;
}
static void restore_deleg_ino(struct inode *dir, u64 ino)
{
struct ceph_inode_info *ci = ceph_inode(dir);
struct ceph_mds_session *s = NULL;
spin_lock(&ci->i_ceph_lock);
if (ci->i_auth_cap)
s = ceph_get_mds_session(ci->i_auth_cap->session);
spin_unlock(&ci->i_ceph_lock);
if (s) {
int err = ceph_restore_deleg_ino(s, ino);
if (err)
pr_warn("ceph: unable to restore delegated ino 0x%llx to session: %d\n",
ino, err);
ceph_put_mds_session(s);
}
}
static void ceph_async_create_cb(struct ceph_mds_client *mdsc,
struct ceph_mds_request *req)
{
int result = req->r_err ? req->r_err :
le32_to_cpu(req->r_reply_info.head->result);
if (result == -EJUKEBOX)
goto out;
mapping_set_error(req->r_parent->i_mapping, result);
if (result) {
struct dentry *dentry = req->r_dentry;
int pathlen;
u64 base;
char *path = ceph_mdsc_build_path(req->r_dentry, &pathlen,
&base, 0);
ceph_dir_clear_complete(req->r_parent);
if (!d_unhashed(dentry))
d_drop(dentry);
/* FIXME: start returning I/O errors on all accesses? */
pr_warn("ceph: async create failure path=(%llx)%s result=%d!\n",
base, IS_ERR(path) ? "<<bad>>" : path, result);
ceph_mdsc_free_path(path, pathlen);
}
if (req->r_target_inode) {
struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
u64 ino = ceph_vino(req->r_target_inode).ino;
if (req->r_deleg_ino != ino)
pr_warn("%s: inode number mismatch! err=%d deleg_ino=0x%llx target=0x%llx\n",
__func__, req->r_err, req->r_deleg_ino, ino);
mapping_set_error(req->r_target_inode->i_mapping, result);
spin_lock(&ci->i_ceph_lock);
if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) {
ci->i_ceph_flags &= ~CEPH_I_ASYNC_CREATE;
wake_up_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT);
}
ceph_kick_flushing_inode_caps(req->r_session, ci);
spin_unlock(&ci->i_ceph_lock);
} else {
pr_warn("%s: no req->r_target_inode for 0x%llx\n", __func__,
req->r_deleg_ino);
}
out:
ceph_mdsc_release_dir_caps(req);
}
static int ceph_finish_async_create(struct inode *dir, struct dentry *dentry,
struct file *file, umode_t mode,
struct ceph_mds_request *req,
struct ceph_acl_sec_ctx *as_ctx,
struct ceph_file_layout *lo)
{
int ret;
char xattr_buf[4];
struct ceph_mds_reply_inode in = { };
struct ceph_mds_reply_info_in iinfo = { .in = &in };
struct ceph_inode_info *ci = ceph_inode(dir);
struct inode *inode;
struct timespec64 now;
struct ceph_vino vino = { .ino = req->r_deleg_ino,
.snap = CEPH_NOSNAP };
ktime_get_real_ts64(&now);
inode = ceph_get_inode(dentry->d_sb, vino);
if (IS_ERR(inode))
return PTR_ERR(inode);
iinfo.inline_version = CEPH_INLINE_NONE;
iinfo.change_attr = 1;
ceph_encode_timespec64(&iinfo.btime, &now);
iinfo.xattr_len = ARRAY_SIZE(xattr_buf);
iinfo.xattr_data = xattr_buf;
memset(iinfo.xattr_data, 0, iinfo.xattr_len);
in.ino = cpu_to_le64(vino.ino);
in.snapid = cpu_to_le64(CEPH_NOSNAP);
in.version = cpu_to_le64(1); // ???
in.cap.caps = in.cap.wanted = cpu_to_le32(CEPH_CAP_ALL_FILE);
in.cap.cap_id = cpu_to_le64(1);
in.cap.realm = cpu_to_le64(ci->i_snap_realm->ino);
in.cap.flags = CEPH_CAP_FLAG_AUTH;
in.ctime = in.mtime = in.atime = iinfo.btime;
in.mode = cpu_to_le32((u32)mode);
in.truncate_seq = cpu_to_le32(1);
in.truncate_size = cpu_to_le64(-1ULL);
in.xattr_version = cpu_to_le64(1);
in.uid = cpu_to_le32(from_kuid(&init_user_ns, current_fsuid()));
in.gid = cpu_to_le32(from_kgid(&init_user_ns, dir->i_mode & S_ISGID ?
dir->i_gid : current_fsgid()));
in.nlink = cpu_to_le32(1);
in.max_size = cpu_to_le64(lo->stripe_unit);
ceph_file_layout_to_legacy(lo, &in.layout);
ret = ceph_fill_inode(inode, NULL, &iinfo, NULL, req->r_session,
req->r_fmode, NULL);
if (ret) {
dout("%s failed to fill inode: %d\n", __func__, ret);
ceph_dir_clear_complete(dir);
if (!d_unhashed(dentry))
d_drop(dentry);
if (inode->i_state & I_NEW)
discard_new_inode(inode);
} else {
struct dentry *dn;
dout("%s d_adding new inode 0x%llx to 0x%lx/%s\n", __func__,
vino.ino, dir->i_ino, dentry->d_name.name);
ceph_dir_clear_ordered(dir);
ceph_init_inode_acls(inode, as_ctx);
if (inode->i_state & I_NEW) {
/*
* If it's not I_NEW, then someone created this before
* we got here. Assume the server is aware of it at
* that point and don't worry about setting
* CEPH_I_ASYNC_CREATE.
*/
ceph_inode(inode)->i_ceph_flags = CEPH_I_ASYNC_CREATE;
unlock_new_inode(inode);
}
if (d_in_lookup(dentry) || d_really_is_negative(dentry)) {
if (!d_unhashed(dentry))
d_drop(dentry);
dn = d_splice_alias(inode, dentry);
WARN_ON_ONCE(dn && dn != dentry);
}
file->f_mode |= FMODE_CREATED;
ret = finish_open(file, dentry, ceph_open);
}
return ret;
}
/*
* Do a lookup + open with a single request. If we get a non-existent
* file or symlink, return 1 so the VFS can retry.
*/
int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
struct file *file, unsigned flags, umode_t mode)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
struct ceph_mds_client *mdsc = fsc->mdsc;
struct ceph_mds_request *req;
struct dentry *dn;
struct ceph_acl_sec_ctx as_ctx = {};
bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
int mask;
int err;
dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
dir, dentry, dentry,
d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
if (dentry->d_name.len > NAME_MAX)
return -ENAMETOOLONG;
if (flags & O_CREAT) {
if (ceph_quota_is_max_files_exceeded(dir))
return -EDQUOT;
err = ceph_pre_init_acls(dir, &mode, &as_ctx);
if (err < 0)
return err;
err = ceph_security_init_secctx(dentry, mode, &as_ctx);
if (err < 0)
goto out_ctx;
} else if (!d_in_lookup(dentry)) {
/* If it's not being looked up, it's negative */
return -ENOENT;
}
retry:
/* do the open */
req = prepare_open_request(dir->i_sb, flags, mode);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto out_ctx;
}
req->r_dentry = dget(dentry);
req->r_num_caps = 2;
mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
if (ceph_security_xattr_wanted(dir))
mask |= CEPH_CAP_XATTR_SHARED;
req->r_args.open.mask = cpu_to_le32(mask);
req->r_parent = dir;
if (flags & O_CREAT) {
struct ceph_file_layout lo;
req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
if (as_ctx.pagelist) {
req->r_pagelist = as_ctx.pagelist;
as_ctx.pagelist = NULL;
}
if (try_async &&
(req->r_dir_caps =
try_prep_async_create(dir, dentry, &lo,
&req->r_deleg_ino))) {
set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
req->r_args.open.flags |= cpu_to_le32(CEPH_O_EXCL);
req->r_callback = ceph_async_create_cb;
err = ceph_mdsc_submit_request(mdsc, dir, req);
if (!err) {
err = ceph_finish_async_create(dir, dentry,
file, mode, req,
&as_ctx, &lo);
} else if (err == -EJUKEBOX) {
restore_deleg_ino(dir, req->r_deleg_ino);
ceph_mdsc_put_request(req);
try_async = false;
goto retry;
}
goto out_req;
}
}
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
err = ceph_mdsc_do_request(mdsc,
(flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
req);
err = ceph_handle_snapdir(req, dentry, err);
if (err)
goto out_req;
if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
err = ceph_handle_notrace_create(dir, dentry);
if (d_in_lookup(dentry)) {
dn = ceph_finish_lookup(req, dentry, err);
if (IS_ERR(dn))
err = PTR_ERR(dn);
} else {
/* we were given a hashed negative dentry */
dn = NULL;
}
if (err)
goto out_req;
if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
/* make vfs retry on splice, ENOENT, or symlink */
dout("atomic_open finish_no_open on dn %p\n", dn);
err = finish_no_open(file, dn);
} else {
dout("atomic_open finish_open on dn %p\n", dn);
if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
struct inode *newino = d_inode(dentry);
cache_file_layout(dir, newino);
ceph_init_inode_acls(newino, &as_ctx);
file->f_mode |= FMODE_CREATED;
}
err = finish_open(file, dentry, ceph_open);
}
out_req:
ceph_mdsc_put_request(req);
out_ctx:
ceph_release_acl_sec_ctx(&as_ctx);
dout("atomic_open result=%d\n", err);
return err;
}
int ceph_release(struct inode *inode, struct file *file)
{
struct ceph_inode_info *ci = ceph_inode(inode);
if (S_ISDIR(inode->i_mode)) {
struct ceph_dir_file_info *dfi = file->private_data;
dout("release inode %p dir file %p\n", inode, file);
WARN_ON(!list_empty(&dfi->file_info.rw_contexts));
ceph_put_fmode(ci, dfi->file_info.fmode, 1);
if (dfi->last_readdir)
ceph_mdsc_put_request(dfi->last_readdir);
kfree(dfi->last_name);
kfree(dfi->dir_info);
kmem_cache_free(ceph_dir_file_cachep, dfi);
} else {
struct ceph_file_info *fi = file->private_data;
dout("release inode %p regular file %p\n", inode, file);
WARN_ON(!list_empty(&fi->rw_contexts));
ceph_put_fmode(ci, fi->fmode, 1);
kmem_cache_free(ceph_file_cachep, fi);
}
/* wake up anyone waiting for caps on this inode */
wake_up_all(&ci->i_cap_wq);
return 0;
}
enum {
HAVE_RETRIED = 1,
CHECK_EOF = 2,
READ_INLINE = 3,
};
/*
* Completely synchronous read and write methods. Direct from __user
* buffer to osd, or directly to user pages (if O_DIRECT).
*
* If the read spans object boundary, just do multiple reads. (That's not
* atomic, but good enough for now.)
*
* If we get a short result from the OSD, check against i_size; we need to
* only return a short read to the caller if we hit EOF.
*/
static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
int *retry_op)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
struct ceph_osd_client *osdc = &fsc->client->osdc;
ssize_t ret;
u64 off = iocb->ki_pos;
u64 len = iov_iter_count(to);
dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len,
(file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
if (!len)
return 0;
/*
* flush any page cache pages in this range. this
* will make concurrent normal and sync io slow,
* but it will at least behave sensibly when they are
* in sequence.
*/
ret = filemap_write_and_wait_range(inode->i_mapping,
off, off + len - 1);
if (ret < 0)
return ret;
ret = 0;
while ((len = iov_iter_count(to)) > 0) {
struct ceph_osd_request *req;
struct page **pages;
int num_pages;
size_t page_off;
u64 i_size;
bool more;
req = ceph_osdc_new_request(osdc, &ci->i_layout,
ci->i_vino, off, &len, 0, 1,
CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
NULL, ci->i_truncate_seq,
ci->i_truncate_size, false);
if (IS_ERR(req)) {
ret = PTR_ERR(req);
break;
}
more = len < iov_iter_count(to);
if (unlikely(iov_iter_is_pipe(to))) {
ret = iov_iter_get_pages_alloc(to, &pages, len,
&page_off);
if (ret <= 0) {
ceph_osdc_put_request(req);
ret = -ENOMEM;
break;
}
num_pages = DIV_ROUND_UP(ret + page_off, PAGE_SIZE);
if (ret < len) {
len = ret;
osd_req_op_extent_update(req, 0, len);
more = false;
}
} else {
num_pages = calc_pages_for(off, len);
page_off = off & ~PAGE_MASK;
pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
if (IS_ERR(pages)) {
ceph_osdc_put_request(req);
ret = PTR_ERR(pages);
break;
}
}
osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off,
false, false);
ret = ceph_osdc_start_request(osdc, req, false);
if (!ret)
ret = ceph_osdc_wait_request(osdc, req);
ceph_osdc_put_request(req);
i_size = i_size_read(inode);
dout("sync_read %llu~%llu got %zd i_size %llu%s\n",
off, len, ret, i_size, (more ? " MORE" : ""));
if (ret == -ENOENT)
ret = 0;
if (ret >= 0 && ret < len && (off + ret < i_size)) {
int zlen = min(len - ret, i_size - off - ret);
int zoff = page_off + ret;
dout("sync_read zero gap %llu~%llu\n",
off + ret, off + ret + zlen);
ceph_zero_page_vector_range(zoff, zlen, pages);
ret += zlen;
}
if (unlikely(iov_iter_is_pipe(to))) {
if (ret > 0) {
iov_iter_advance(to, ret);
off += ret;
} else {
iov_iter_advance(to, 0);
}
ceph_put_page_vector(pages, num_pages, false);
} else {
int idx = 0;
size_t left = ret > 0 ? ret : 0;
while (left > 0) {
size_t len, copied;
page_off = off & ~PAGE_MASK;
len = min_t(size_t, left, PAGE_SIZE - page_off);
copied = copy_page_to_iter(pages[idx++],
page_off, len, to);
off += copied;
left -= copied;
if (copied < len) {
ret = -EFAULT;
break;
}
}
ceph_release_page_vector(pages, num_pages);
}
if (ret < 0) {
if (ret == -EBLACKLISTED)
fsc->blacklisted = true;
break;
}
if (off >= i_size || !more)
break;
}
if (off > iocb->ki_pos) {
if (ret >= 0 &&
iov_iter_count(to) > 0 && off >= i_size_read(inode))
*retry_op = CHECK_EOF;
ret = off - iocb->ki_pos;
iocb->ki_pos = off;
}
dout("sync_read result %zd retry_op %d\n", ret, *retry_op);
return ret;
}
struct ceph_aio_request {
struct kiocb *iocb;
size_t total_len;
bool write;
bool should_dirty;
int error;
struct list_head osd_reqs;
unsigned num_reqs;
atomic_t pending_reqs;
struct timespec64 mtime;
struct ceph_cap_flush *prealloc_cf;
};
struct ceph_aio_work {
struct work_struct work;
struct ceph_osd_request *req;
};
static void ceph_aio_retry_work(struct work_struct *work);
static void ceph_aio_complete(struct inode *inode,
struct ceph_aio_request *aio_req)
{
struct ceph_inode_info *ci = ceph_inode(inode);
int ret;