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-rw-r--r--fs/ceph/inode.c1774
1 files changed, 1774 insertions, 0 deletions
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
new file mode 100644
index 0000000..26f883c
--- /dev/null
+++ b/fs/ceph/inode.c
@@ -0,0 +1,1774 @@
+#include "ceph_debug.h"
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/smp_lock.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/uaccess.h>
+#include <linux/kernel.h>
+#include <linux/namei.h>
+#include <linux/writeback.h>
+#include <linux/vmalloc.h>
+#include <linux/pagevec.h>
+
+#include "super.h"
+#include "decode.h"
+
+/*
+ * Ceph inode operations
+ *
+ * Implement basic inode helpers (get, alloc) and inode ops (getattr,
+ * setattr, etc.), xattr helpers, and helpers for assimilating
+ * metadata returned by the MDS into our cache.
+ *
+ * Also define helpers for doing asynchronous writeback, invalidation,
+ * and truncation for the benefit of those who can't afford to block
+ * (typically because they are in the message handler path).
+ */
+
+static const struct inode_operations ceph_symlink_iops;
+
+static void ceph_invalidate_work(struct work_struct *work);
+static void ceph_writeback_work(struct work_struct *work);
+static void ceph_vmtruncate_work(struct work_struct *work);
+
+/*
+ * find or create an inode, given the ceph ino number
+ */
+struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
+{
+ struct inode *inode;
+ ino_t t = ceph_vino_to_ino(vino);
+
+ inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
+ if (inode == NULL)
+ return ERR_PTR(-ENOMEM);
+ if (inode->i_state & I_NEW) {
+ dout("get_inode created new inode %p %llx.%llx ino %llx\n",
+ inode, ceph_vinop(inode), (u64)inode->i_ino);
+ unlock_new_inode(inode);
+ }
+
+ dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
+ vino.snap, inode);
+ return inode;
+}
+
+/*
+ * get/constuct snapdir inode for a given directory
+ */
+struct inode *ceph_get_snapdir(struct inode *parent)
+{
+ struct ceph_vino vino = {
+ .ino = ceph_ino(parent),
+ .snap = CEPH_SNAPDIR,
+ };
+ struct inode *inode = ceph_get_inode(parent->i_sb, vino);
+ struct ceph_inode_info *ci = ceph_inode(inode);
+
+ BUG_ON(!S_ISDIR(parent->i_mode));
+ if (IS_ERR(inode))
+ return ERR_PTR(PTR_ERR(inode));
+ inode->i_mode = parent->i_mode;
+ inode->i_uid = parent->i_uid;
+ inode->i_gid = parent->i_gid;
+ inode->i_op = &ceph_dir_iops;
+ inode->i_fop = &ceph_dir_fops;
+ ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
+ ci->i_rbytes = 0;
+ return inode;
+}
+
+const struct inode_operations ceph_file_iops = {
+ .permission = ceph_permission,
+ .setattr = ceph_setattr,
+ .getattr = ceph_getattr,
+ .setxattr = ceph_setxattr,
+ .getxattr = ceph_getxattr,
+ .listxattr = ceph_listxattr,
+ .removexattr = ceph_removexattr,
+};
+
+
+/*
+ * We use a 'frag tree' to keep track of the MDS's directory fragments
+ * for a given inode (usually there is just a single fragment). We
+ * need to know when a child frag is delegated to a new MDS, or when
+ * it is flagged as replicated, so we can direct our requests
+ * accordingly.
+ */
+
+/*
+ * find/create a frag in the tree
+ */
+static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
+ u32 f)
+{
+ struct rb_node **p;
+ struct rb_node *parent = NULL;
+ struct ceph_inode_frag *frag;
+ int c;
+
+ p = &ci->i_fragtree.rb_node;
+ while (*p) {
+ parent = *p;
+ frag = rb_entry(parent, struct ceph_inode_frag, node);
+ c = ceph_frag_compare(f, frag->frag);
+ if (c < 0)
+ p = &(*p)->rb_left;
+ else if (c > 0)
+ p = &(*p)->rb_right;
+ else
+ return frag;
+ }
+
+ frag = kmalloc(sizeof(*frag), GFP_NOFS);
+ if (!frag) {
+ pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
+ "frag %x\n", &ci->vfs_inode,
+ ceph_vinop(&ci->vfs_inode), f);
+ return ERR_PTR(-ENOMEM);
+ }
+ frag->frag = f;
+ frag->split_by = 0;
+ frag->mds = -1;
+ frag->ndist = 0;
+
+ rb_link_node(&frag->node, parent, p);
+ rb_insert_color(&frag->node, &ci->i_fragtree);
+
+ dout("get_or_create_frag added %llx.%llx frag %x\n",
+ ceph_vinop(&ci->vfs_inode), f);
+ return frag;
+}
+
+/*
+ * find a specific frag @f
+ */
+struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
+{
+ struct rb_node *n = ci->i_fragtree.rb_node;
+
+ while (n) {
+ struct ceph_inode_frag *frag =
+ rb_entry(n, struct ceph_inode_frag, node);
+ int c = ceph_frag_compare(f, frag->frag);
+ if (c < 0)
+ n = n->rb_left;
+ else if (c > 0)
+ n = n->rb_right;
+ else
+ return frag;
+ }
+ return NULL;
+}
+
+/*
+ * Choose frag containing the given value @v. If @pfrag is
+ * specified, copy the frag delegation info to the caller if
+ * it is present.
+ */
+u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
+ struct ceph_inode_frag *pfrag,
+ int *found)
+{
+ u32 t = ceph_frag_make(0, 0);
+ struct ceph_inode_frag *frag;
+ unsigned nway, i;
+ u32 n;
+
+ if (found)
+ *found = 0;
+
+ mutex_lock(&ci->i_fragtree_mutex);
+ while (1) {
+ WARN_ON(!ceph_frag_contains_value(t, v));
+ frag = __ceph_find_frag(ci, t);
+ if (!frag)
+ break; /* t is a leaf */
+ if (frag->split_by == 0) {
+ if (pfrag)
+ memcpy(pfrag, frag, sizeof(*pfrag));
+ if (found)
+ *found = 1;
+ break;
+ }
+
+ /* choose child */
+ nway = 1 << frag->split_by;
+ dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
+ frag->split_by, nway);
+ for (i = 0; i < nway; i++) {
+ n = ceph_frag_make_child(t, frag->split_by, i);
+ if (ceph_frag_contains_value(n, v)) {
+ t = n;
+ break;
+ }
+ }
+ BUG_ON(i == nway);
+ }
+ dout("choose_frag(%x) = %x\n", v, t);
+
+ mutex_unlock(&ci->i_fragtree_mutex);
+ return t;
+}
+
+/*
+ * Process dirfrag (delegation) info from the mds. Include leaf
+ * fragment in tree ONLY if ndist > 0. Otherwise, only
+ * branches/splits are included in i_fragtree)
+ */
+static int ceph_fill_dirfrag(struct inode *inode,
+ struct ceph_mds_reply_dirfrag *dirinfo)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct ceph_inode_frag *frag;
+ u32 id = le32_to_cpu(dirinfo->frag);
+ int mds = le32_to_cpu(dirinfo->auth);
+ int ndist = le32_to_cpu(dirinfo->ndist);
+ int i;
+ int err = 0;
+
+ mutex_lock(&ci->i_fragtree_mutex);
+ if (ndist == 0) {
+ /* no delegation info needed. */
+ frag = __ceph_find_frag(ci, id);
+ if (!frag)
+ goto out;
+ if (frag->split_by == 0) {
+ /* tree leaf, remove */
+ dout("fill_dirfrag removed %llx.%llx frag %x"
+ " (no ref)\n", ceph_vinop(inode), id);
+ rb_erase(&frag->node, &ci->i_fragtree);
+ kfree(frag);
+ } else {
+ /* tree branch, keep and clear */
+ dout("fill_dirfrag cleared %llx.%llx frag %x"
+ " referral\n", ceph_vinop(inode), id);
+ frag->mds = -1;
+ frag->ndist = 0;
+ }
+ goto out;
+ }
+
+
+ /* find/add this frag to store mds delegation info */
+ frag = __get_or_create_frag(ci, id);
+ if (IS_ERR(frag)) {
+ /* this is not the end of the world; we can continue
+ with bad/inaccurate delegation info */
+ pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
+ ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
+ err = -ENOMEM;
+ goto out;
+ }
+
+ frag->mds = mds;
+ frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
+ for (i = 0; i < frag->ndist; i++)
+ frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
+ dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
+ ceph_vinop(inode), frag->frag, frag->ndist);
+
+out:
+ mutex_unlock(&ci->i_fragtree_mutex);
+ return err;
+}
+
+
+/*
+ * initialize a newly allocated inode.
+ */
+struct inode *ceph_alloc_inode(struct super_block *sb)
+{
+ struct ceph_inode_info *ci;
+ int i;
+
+ ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
+ if (!ci)
+ return NULL;
+
+ dout("alloc_inode %p\n", &ci->vfs_inode);
+
+ ci->i_version = 0;
+ ci->i_time_warp_seq = 0;
+ ci->i_ceph_flags = 0;
+ ci->i_release_count = 0;
+ ci->i_symlink = NULL;
+
+ ci->i_fragtree = RB_ROOT;
+ mutex_init(&ci->i_fragtree_mutex);
+
+ ci->i_xattrs.blob = NULL;
+ ci->i_xattrs.prealloc_blob = NULL;
+ ci->i_xattrs.dirty = false;
+ ci->i_xattrs.index = RB_ROOT;
+ ci->i_xattrs.count = 0;
+ ci->i_xattrs.names_size = 0;
+ ci->i_xattrs.vals_size = 0;
+ ci->i_xattrs.version = 0;
+ ci->i_xattrs.index_version = 0;
+
+ ci->i_caps = RB_ROOT;
+ ci->i_auth_cap = NULL;
+ ci->i_dirty_caps = 0;
+ ci->i_flushing_caps = 0;
+ INIT_LIST_HEAD(&ci->i_dirty_item);
+ INIT_LIST_HEAD(&ci->i_flushing_item);
+ ci->i_cap_flush_seq = 0;
+ ci->i_cap_flush_last_tid = 0;
+ memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
+ init_waitqueue_head(&ci->i_cap_wq);
+ ci->i_hold_caps_min = 0;
+ ci->i_hold_caps_max = 0;
+ INIT_LIST_HEAD(&ci->i_cap_delay_list);
+ ci->i_cap_exporting_mds = 0;
+ ci->i_cap_exporting_mseq = 0;
+ ci->i_cap_exporting_issued = 0;
+ INIT_LIST_HEAD(&ci->i_cap_snaps);
+ ci->i_head_snapc = NULL;
+ ci->i_snap_caps = 0;
+
+ for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
+ ci->i_nr_by_mode[i] = 0;
+
+ ci->i_truncate_seq = 0;
+ ci->i_truncate_size = 0;
+ ci->i_truncate_pending = 0;
+
+ ci->i_max_size = 0;
+ ci->i_reported_size = 0;
+ ci->i_wanted_max_size = 0;
+ ci->i_requested_max_size = 0;
+
+ ci->i_pin_ref = 0;
+ ci->i_rd_ref = 0;
+ ci->i_rdcache_ref = 0;
+ ci->i_wr_ref = 0;
+ ci->i_wrbuffer_ref = 0;
+ ci->i_wrbuffer_ref_head = 0;
+ ci->i_shared_gen = 0;
+ ci->i_rdcache_gen = 0;
+ ci->i_rdcache_revoking = 0;
+
+ INIT_LIST_HEAD(&ci->i_unsafe_writes);
+ INIT_LIST_HEAD(&ci->i_unsafe_dirops);
+ spin_lock_init(&ci->i_unsafe_lock);
+
+ ci->i_snap_realm = NULL;
+ INIT_LIST_HEAD(&ci->i_snap_realm_item);
+ INIT_LIST_HEAD(&ci->i_snap_flush_item);
+
+ INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
+ INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
+
+ INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
+
+ return &ci->vfs_inode;
+}
+
+void ceph_destroy_inode(struct inode *inode)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct ceph_inode_frag *frag;
+ struct rb_node *n;
+
+ dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
+
+ ceph_queue_caps_release(inode);
+
+ /*
+ * we may still have a snap_realm reference if there are stray
+ * caps in i_cap_exporting_issued or i_snap_caps.
+ */
+ if (ci->i_snap_realm) {
+ struct ceph_mds_client *mdsc =
+ &ceph_client(ci->vfs_inode.i_sb)->mdsc;
+ struct ceph_snap_realm *realm = ci->i_snap_realm;
+
+ dout(" dropping residual ref to snap realm %p\n", realm);
+ spin_lock(&realm->inodes_with_caps_lock);
+ list_del_init(&ci->i_snap_realm_item);
+ spin_unlock(&realm->inodes_with_caps_lock);
+ ceph_put_snap_realm(mdsc, realm);
+ }
+
+ kfree(ci->i_symlink);
+ while ((n = rb_first(&ci->i_fragtree)) != NULL) {
+ frag = rb_entry(n, struct ceph_inode_frag, node);
+ rb_erase(n, &ci->i_fragtree);
+ kfree(frag);
+ }
+
+ __ceph_destroy_xattrs(ci);
+ if (ci->i_xattrs.blob)
+ ceph_buffer_put(ci->i_xattrs.blob);
+ if (ci->i_xattrs.prealloc_blob)
+ ceph_buffer_put(ci->i_xattrs.prealloc_blob);
+
+ kmem_cache_free(ceph_inode_cachep, ci);
+}
+
+
+/*
+ * Helpers to fill in size, ctime, mtime, and atime. We have to be
+ * careful because either the client or MDS may have more up to date
+ * info, depending on which capabilities are held, and whether
+ * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
+ * and size are monotonically increasing, except when utimes() or
+ * truncate() increments the corresponding _seq values.)
+ */
+int ceph_fill_file_size(struct inode *inode, int issued,
+ u32 truncate_seq, u64 truncate_size, u64 size)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ int queue_trunc = 0;
+
+ if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
+ (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
+ dout("size %lld -> %llu\n", inode->i_size, size);
+ inode->i_size = size;
+ inode->i_blocks = (size + (1<<9) - 1) >> 9;
+ ci->i_reported_size = size;
+ if (truncate_seq != ci->i_truncate_seq) {
+ dout("truncate_seq %u -> %u\n",
+ ci->i_truncate_seq, truncate_seq);
+ ci->i_truncate_seq = truncate_seq;
+ /*
+ * If we hold relevant caps, or in the case where we're
+ * not the only client referencing this file and we
+ * don't hold those caps, then we need to check whether
+ * the file is either opened or mmaped
+ */
+ if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
+ CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
+ CEPH_CAP_FILE_EXCL)) ||
+ mapping_mapped(inode->i_mapping) ||
+ __ceph_caps_file_wanted(ci)) {
+ ci->i_truncate_pending++;
+ queue_trunc = 1;
+ }
+ }
+ }
+ if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
+ ci->i_truncate_size != truncate_size) {
+ dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
+ truncate_size);
+ ci->i_truncate_size = truncate_size;
+ }
+ return queue_trunc;
+}
+
+void ceph_fill_file_time(struct inode *inode, int issued,
+ u64 time_warp_seq, struct timespec *ctime,
+ struct timespec *mtime, struct timespec *atime)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ int warn = 0;
+
+ if (issued & (CEPH_CAP_FILE_EXCL|
+ CEPH_CAP_FILE_WR|
+ CEPH_CAP_FILE_BUFFER)) {
+ if (timespec_compare(ctime, &inode->i_ctime) > 0) {
+ dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
+ inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
+ ctime->tv_sec, ctime->tv_nsec);
+ inode->i_ctime = *ctime;
+ }
+ if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
+ /* the MDS did a utimes() */
+ dout("mtime %ld.%09ld -> %ld.%09ld "
+ "tw %d -> %d\n",
+ inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
+ mtime->tv_sec, mtime->tv_nsec,
+ ci->i_time_warp_seq, (int)time_warp_seq);
+
+ inode->i_mtime = *mtime;
+ inode->i_atime = *atime;
+ ci->i_time_warp_seq = time_warp_seq;
+ } else if (time_warp_seq == ci->i_time_warp_seq) {
+ /* nobody did utimes(); take the max */
+ if (timespec_compare(mtime, &inode->i_mtime) > 0) {
+ dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
+ inode->i_mtime.tv_sec,
+ inode->i_mtime.tv_nsec,
+ mtime->tv_sec, mtime->tv_nsec);
+ inode->i_mtime = *mtime;
+ }
+ if (timespec_compare(atime, &inode->i_atime) > 0) {
+ dout("atime %ld.%09ld -> %ld.%09ld inc\n",
+ inode->i_atime.tv_sec,
+ inode->i_atime.tv_nsec,
+ atime->tv_sec, atime->tv_nsec);
+ inode->i_atime = *atime;
+ }
+ } else if (issued & CEPH_CAP_FILE_EXCL) {
+ /* we did a utimes(); ignore mds values */
+ } else {
+ warn = 1;
+ }
+ } else {
+ /* we have no write caps; whatever the MDS says is true */
+ if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
+ inode->i_ctime = *ctime;
+ inode->i_mtime = *mtime;
+ inode->i_atime = *atime;
+ ci->i_time_warp_seq = time_warp_seq;
+ } else {
+ warn = 1;
+ }
+ }
+ if (warn) /* time_warp_seq shouldn't go backwards */
+ dout("%p mds time_warp_seq %llu < %u\n",
+ inode, time_warp_seq, ci->i_time_warp_seq);
+}
+
+/*
+ * Populate an inode based on info from mds. May be called on new or
+ * existing inodes.
+ */
+static int fill_inode(struct inode *inode,
+ struct ceph_mds_reply_info_in *iinfo,
+ struct ceph_mds_reply_dirfrag *dirinfo,
+ struct ceph_mds_session *session,
+ unsigned long ttl_from, int cap_fmode,
+ struct ceph_cap_reservation *caps_reservation)
+{
+ struct ceph_mds_reply_inode *info = iinfo->in;
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ int i;
+ int issued, implemented;
+ struct timespec mtime, atime, ctime;
+ u32 nsplits;
+ struct ceph_buffer *xattr_blob = NULL;
+ int err = 0;
+ int queue_trunc = 0;
+
+ dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
+ inode, ceph_vinop(inode), le64_to_cpu(info->version),
+ ci->i_version);
+
+ /*
+ * prealloc xattr data, if it looks like we'll need it. only
+ * if len > 4 (meaning there are actually xattrs; the first 4
+ * bytes are the xattr count).
+ */
+ if (iinfo->xattr_len > 4) {
+ xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
+ if (!xattr_blob)
+ pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
+ iinfo->xattr_len);
+ }
+
+ spin_lock(&inode->i_lock);
+
+ /*
+ * provided version will be odd if inode value is projected,
+ * even if stable. skip the update if we have a newer info
+ * (e.g., due to inode info racing form multiple MDSs), or if
+ * we are getting projected (unstable) inode info.
+ */
+ if (le64_to_cpu(info->version) > 0 &&
+ (ci->i_version & ~1) > le64_to_cpu(info->version))
+ goto no_change;
+
+ issued = __ceph_caps_issued(ci, &implemented);
+ issued |= implemented | __ceph_caps_dirty(ci);
+
+ /* update inode */
+ ci->i_version = le64_to_cpu(info->version);
+ inode->i_version++;
+ inode->i_rdev = le32_to_cpu(info->rdev);
+
+ if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
+ inode->i_mode = le32_to_cpu(info->mode);
+ inode->i_uid = le32_to_cpu(info->uid);
+ inode->i_gid = le32_to_cpu(info->gid);
+ dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
+ inode->i_uid, inode->i_gid);
+ }
+
+ if ((issued & CEPH_CAP_LINK_EXCL) == 0)
+ inode->i_nlink = le32_to_cpu(info->nlink);
+
+ /* be careful with mtime, atime, size */
+ ceph_decode_timespec(&atime, &info->atime);
+ ceph_decode_timespec(&mtime, &info->mtime);
+ ceph_decode_timespec(&ctime, &info->ctime);
+ queue_trunc = ceph_fill_file_size(inode, issued,
+ le32_to_cpu(info->truncate_seq),
+ le64_to_cpu(info->truncate_size),
+ le64_to_cpu(info->size));
+ ceph_fill_file_time(inode, issued,
+ le32_to_cpu(info->time_warp_seq),
+ &ctime, &mtime, &atime);
+
+ ci->i_max_size = le64_to_cpu(info->max_size);
+ ci->i_layout = info->layout;
+ inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
+
+ /* xattrs */
+ /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
+ if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
+ le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
+ if (ci->i_xattrs.blob)
+ ceph_buffer_put(ci->i_xattrs.blob);
+ ci->i_xattrs.blob = xattr_blob;
+ if (xattr_blob)
+ memcpy(ci->i_xattrs.blob->vec.iov_base,
+ iinfo->xattr_data, iinfo->xattr_len);
+ ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
+ }
+
+ inode->i_mapping->a_ops = &ceph_aops;
+ inode->i_mapping->backing_dev_info =
+ &ceph_client(inode->i_sb)->backing_dev_info;
+
+ switch (inode->i_mode & S_IFMT) {
+ case S_IFIFO:
+ case S_IFBLK:
+ case S_IFCHR:
+ case S_IFSOCK:
+ init_special_inode(inode, inode->i_mode, inode->i_rdev);
+ inode->i_op = &ceph_file_iops;
+ break;
+ case S_IFREG:
+ inode->i_op = &ceph_file_iops;
+ inode->i_fop = &ceph_file_fops;
+ break;
+ case S_IFLNK:
+ inode->i_op = &ceph_symlink_iops;
+ if (!ci->i_symlink) {
+ int symlen = iinfo->symlink_len;
+ char *sym;
+
+ BUG_ON(symlen != inode->i_size);
+ spin_unlock(&inode->i_lock);
+
+ err = -ENOMEM;
+ sym = kmalloc(symlen+1, GFP_NOFS);
+ if (!sym)
+ goto out;
+ memcpy(sym, iinfo->symlink, symlen);
+ sym[symlen] = 0;
+
+ spin_lock(&inode->i_lock);
+ if (!ci->i_symlink)
+ ci->i_symlink = sym;
+ else
+ kfree(sym); /* lost a race */
+ }
+ break;
+ case S_IFDIR:
+ inode->i_op = &ceph_dir_iops;
+ inode->i_fop = &ceph_dir_fops;
+
+ ci->i_files = le64_to_cpu(info->files);
+ ci->i_subdirs = le64_to_cpu(info->subdirs);
+ ci->i_rbytes = le64_to_cpu(info->rbytes);
+ ci->i_rfiles = le64_to_cpu(info->rfiles);
+ ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
+ ceph_decode_timespec(&ci->i_rctime, &info->rctime);
+
+ /* set dir completion flag? */
+ if (ci->i_files == 0 && ci->i_subdirs == 0 &&
+ ceph_snap(inode) == CEPH_NOSNAP &&
+ (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED)) {
+ dout(" marking %p complete (empty)\n", inode);
+ ci->i_ceph_flags |= CEPH_I_COMPLETE;
+ ci->i_max_offset = 2;
+ }
+
+ /* it may be better to set st_size in getattr instead? */
+ if (ceph_test_opt(ceph_client(inode->i_sb), RBYTES))
+ inode->i_size = ci->i_rbytes;
+ break;
+ default:
+ pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
+ ceph_vinop(inode), inode->i_mode);
+ }
+
+no_change:
+ spin_unlock(&inode->i_lock);
+
+ /* queue truncate if we saw i_size decrease */
+ if (queue_trunc)
+ ceph_queue_vmtruncate(inode);
+
+ /* populate frag tree */
+ /* FIXME: move me up, if/when version reflects fragtree changes */
+ nsplits = le32_to_cpu(info->fragtree.nsplits);
+ mutex_lock(&ci->i_fragtree_mutex);
+ for (i = 0; i < nsplits; i++) {
+ u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
+ struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
+
+ if (IS_ERR(frag))
+ continue;
+ frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
+ dout(" frag %x split by %d\n", frag->frag, frag->split_by);
+ }
+ mutex_unlock(&ci->i_fragtree_mutex);
+
+ /* were we issued a capability? */
+ if (info->cap.caps) {
+ if (ceph_snap(inode) == CEPH_NOSNAP) {
+ ceph_add_cap(inode, session,
+ le64_to_cpu(info->cap.cap_id),
+ cap_fmode,
+ le32_to_cpu(info->cap.caps),
+ le32_to_cpu(info->cap.wanted),
+ le32_to_cpu(info->cap.seq),
+ le32_to_cpu(info->cap.mseq),
+ le64_to_cpu(info->cap.realm),
+ info->cap.flags,
+ caps_reservation);
+ } else {
+ spin_lock(&inode->i_lock);
+ dout(" %p got snap_caps %s\n", inode,
+ ceph_cap_string(le32_to_cpu(info->cap.caps)));
+ ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
+ if (cap_fmode >= 0)
+ __ceph_get_fmode(ci, cap_fmode);
+ spin_unlock(&inode->i_lock);
+ }
+ }
+
+ /* update delegation info? */
+ if (dirinfo)
+ ceph_fill_dirfrag(inode, dirinfo);
+
+ err = 0;
+
+out:
+ if (xattr_blob)
+ ceph_buffer_put(xattr_blob);
+ return err;
+}
+
+/*
+ * caller should hold session s_mutex.
+ */
+static void update_dentry_lease(struct dentry *dentry,
+ struct ceph_mds_reply_lease *lease,
+ struct ceph_mds_session *session,
+ unsigned long from_time)
+{
+ struct ceph_dentry_info *di = ceph_dentry(dentry);
+ long unsigned duration = le32_to_cpu(lease->duration_ms);
+ long unsigned ttl = from_time + (duration * HZ) / 1000;
+ long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
+ struct inode *dir;
+
+ /* only track leases on regular dentries */
+ if (dentry->d_op != &ceph_dentry_ops)
+ return;
+
+ spin_lock(&dentry->d_lock);
+ dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
+ dentry, le16_to_cpu(lease->mask), duration, ttl);
+
+ /* make lease_rdcache_gen match directory */
+ dir = dentry->d_parent->d_inode;
+ di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
+
+ if (lease->mask == 0)
+ goto out_unlock;
+
+ if (di->lease_gen == session->s_cap_gen &&
+ time_before(ttl, dentry->d_time))
+ goto out_unlock; /* we already have a newer lease. */
+
+ if (di->lease_session && di->lease_session != session)
+ goto out_unlock;
+
+ ceph_dentry_lru_touch(dentry);
+
+ if (!di->lease_session)
+ di->lease_session = ceph_get_mds_session(session);
+ di->lease_gen = session->s_cap_gen;
+ di->lease_seq = le32_to_cpu(lease->seq);
+ di->lease_renew_after = half_ttl;
+ di->lease_renew_from = 0;
+ dentry->d_time = ttl;
+out_unlock:
+ spin_unlock(&dentry->d_lock);
+ return;
+}
+
+/*
+ * splice a dentry to an inode.
+ * caller must hold directory i_mutex for this to be safe.
+ *
+ * we will only rehash the resulting dentry if @prehash is
+ * true; @prehash will be set to false (for the benefit of
+ * the caller) if we fail.
+ */
+static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
+ bool *prehash)
+{
+ struct dentry *realdn;
+
+ /* dn must be unhashed */
+ if (!d_unhashed(dn))
+ d_drop(dn);
+ realdn = d_materialise_unique(dn, in);
+ if (IS_ERR(realdn)) {
+ pr_err("splice_dentry error %p inode %p ino %llx.%llx\n",
+ dn, in, ceph_vinop(in));
+ if (prehash)
+ *prehash = false; /* don't rehash on error */
+ dn = realdn; /* note realdn contains the error */
+ goto out;
+ } else if (realdn) {
+ dout("dn %p (%d) spliced with %p (%d) "
+ "inode %p ino %llx.%llx\n",
+ dn, atomic_read(&dn->d_count),
+ realdn, atomic_read(&realdn->d_count),
+ realdn->d_inode, ceph_vinop(realdn->d_inode));
+ dput(dn);
+ dn = realdn;
+ } else {
+ BUG_ON(!ceph_dentry(dn));
+
+ dout("dn %p attached to %p ino %llx.%llx\n",
+ dn, dn->d_inode, ceph_vinop(dn->d_inode));
+ }
+ if ((!prehash || *prehash) && d_unhashed(dn))
+ d_rehash(dn);
+out:
+ return dn;
+}
+
+/*
+ * Set dentry's directory position based on the current dir's max, and
+ * order it in d_subdirs, so that dcache_readdir behaves.
+ */
+static void ceph_set_dentry_offset(struct dentry *dn)
+{
+ struct dentry *dir = dn->d_parent;
+ struct inode *inode = dn->d_parent->d_inode;
+ struct ceph_dentry_info *di;
+
+ BUG_ON(!inode);
+
+ di = ceph_dentry(dn);
+
+ spin_lock(&inode->i_lock);
+ di->offset = ceph_inode(inode)->i_max_offset++;
+ spin_unlock(&inode->i_lock);
+
+ spin_lock(&dcache_lock);
+ spin_lock(&dn->d_lock);
+ list_move_tail(&dir->d_subdirs, &dn->d_u.d_child);
+ dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
+ dn->d_u.d_child.prev, dn->d_u.d_child.next);
+ spin_unlock(&dn->d_lock);
+ spin_unlock(&dcache_lock);
+}
+
+/*
+ * Incorporate results into the local cache. This is either just
+ * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
+ * after a lookup).
+ *
+ * A reply may contain
+ * a directory inode along with a dentry.
+ * and/or a target inode
+ *
+ * Called with snap_rwsem (read).
+ */
+int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
+ struct ceph_mds_session *session)
+{
+ struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
+ struct inode *in = NULL;
+ struct ceph_mds_reply_inode *ininfo;
+ struct ceph_vino vino;
+ struct ceph_client *client = ceph_sb_to_client(sb);
+ int i = 0;
+ int err = 0;
+
+ dout("fill_trace %p is_dentry %d is_target %d\n", req,
+ rinfo->head->is_dentry, rinfo->head->is_target);
+
+#if 0
+ /*
+ * Debugging hook:
+ *
+ * If we resend completed ops to a recovering mds, we get no
+ * trace. Since that is very rare, pretend this is the case
+ * to ensure the 'no trace' handlers in the callers behave.
+ *
+ * Fill in inodes unconditionally to avoid breaking cap
+ * invariants.
+ */
+ if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
+ pr_info("fill_trace faking empty trace on %lld %s\n",
+ req->r_tid, ceph_mds_op_name(rinfo->head->op));
+ if (rinfo->head->is_dentry) {
+ rinfo->head->is_dentry = 0;
+ err = fill_inode(req->r_locked_dir,
+ &rinfo->diri, rinfo->dirfrag,
+ session, req->r_request_started, -1);
+ }
+ if (rinfo->head->is_target) {
+ rinfo->head->is_target = 0;
+ ininfo = rinfo->targeti.in;
+ vino.ino = le64_to_cpu(ininfo->ino);
+ vino.snap = le64_to_cpu(ininfo->snapid);
+ in = ceph_get_inode(sb, vino);
+ err = fill_inode(in, &rinfo->targeti, NULL,
+ session, req->r_request_started,
+ req->r_fmode);
+ iput(in);
+ }
+ }
+#endif
+
+ if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
+ dout("fill_trace reply is empty!\n");
+ if (rinfo->head->result == 0 && req->r_locked_dir) {
+ struct ceph_inode_info *ci =
+ ceph_inode(req->r_locked_dir);
+ dout(" clearing %p complete (empty trace)\n",
+ req->r_locked_dir);
+ ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
+ ci->i_release_count++;
+ }
+ return 0;
+ }
+
+ if (rinfo->head->is_dentry) {
+ struct inode *dir = req->r_locked_dir;
+
+ err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
+ session, req->r_request_started, -1,
+ &req->r_caps_reservation);
+ if (err < 0)
+ return err;
+ }
+
+ /*
+ * ignore null lease/binding on snapdir ENOENT, or else we
+ * will have trouble splicing in the virtual snapdir later
+ */
+ if (rinfo->head->is_dentry && !req->r_aborted &&
+ (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
+ client->mount_args->snapdir_name,
+ req->r_dentry->d_name.len))) {
+ /*
+ * lookup link rename : null -> possibly existing inode
+ * mknod symlink mkdir : null -> new inode
+ * unlink : linked -> null
+ */
+ struct inode *dir = req->r_locked_dir;
+ struct dentry *dn = req->r_dentry;
+ bool have_dir_cap, have_lease;
+
+ BUG_ON(!dn);
+ BUG_ON(!dir);
+ BUG_ON(dn->d_parent->d_inode != dir);
+ BUG_ON(ceph_ino(dir) !=
+ le64_to_cpu(rinfo->diri.in->ino));
+ BUG_ON(ceph_snap(dir) !=
+ le64_to_cpu(rinfo->diri.in->snapid));
+
+ /* do we have a lease on the whole dir? */
+ have_dir_cap =
+ (le32_to_cpu(rinfo->diri.in->cap.caps) &
+ CEPH_CAP_FILE_SHARED);
+
+ /* do we have a dn lease? */
+ have_lease = have_dir_cap ||
+ (le16_to_cpu(rinfo->dlease->mask) &
+ CEPH_LOCK_DN);
+
+ if (!have_lease)
+ dout("fill_trace no dentry lease or dir cap\n");
+
+ /* rename? */
+ if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
+ dout(" src %p '%.*s' dst %p '%.*s'\n",
+ req->r_old_dentry,
+ req->r_old_dentry->d_name.len,
+ req->r_old_dentry->d_name.name,
+ dn, dn->d_name.len, dn->d_name.name);
+ dout("fill_trace doing d_move %p -> %p\n",
+ req->r_old_dentry, dn);
+ d_move(req->r_old_dentry, dn);
+ dout(" src %p '%.*s' dst %p '%.*s'\n",
+ req->r_old_dentry,
+ req->r_old_dentry->d_name.len,
+ req->r_old_dentry->d_name.name,
+ dn, dn->d_name.len, dn->d_name.name);
+ /* ensure target dentry is invalidated, despite
+ rehashing bug in vfs_rename_dir */
+ dn->d_time = jiffies;
+ ceph_dentry(dn)->lease_shared_gen = 0;
+ /* take overwritten dentry's readdir offset */
+ ceph_dentry(req->r_old_dentry)->offset =
+ ceph_dentry(dn)->offset;
+ dn = req->r_old_dentry; /* use old_dentry */
+ in = dn->d_inode;
+ }
+
+ /* null dentry? */
+ if (!rinfo->head->is_target) {
+ dout("fill_trace null dentry\n");
+ if (dn->d_inode) {
+ dout("d_delete %p\n", dn);
+ d_delete(dn);
+ } else {
+ dout("d_instantiate %p NULL\n", dn);
+ d_instantiate(dn, NULL);
+ if (have_lease && d_unhashed(dn))
+ d_rehash(dn);
+ update_dentry_lease(dn, rinfo->dlease,
+ session,
+ req->r_request_started);
+ }
+ goto done;
+ }
+
+ /* attach proper inode */
+ ininfo = rinfo->targeti.in;
+ vino.ino = le64_to_cpu(ininfo->ino);
+ vino.snap = le64_to_cpu(ininfo->snapid);
+ if (!dn->d_inode) {
+ in = ceph_get_inode(sb, vino);
+ if (IS_ERR(in)) {
+ pr_err("fill_trace bad get_inode "
+ "%llx.%llx\n", vino.ino, vino.snap);
+ err = PTR_ERR(in);
+ d_delete(dn);
+ goto done;
+ }
+ dn = splice_dentry(dn, in, &have_lease);
+ if (IS_ERR(dn)) {
+ err = PTR_ERR(dn);
+ goto done;
+ }
+ req->r_dentry = dn; /* may have spliced */
+ ceph_set_dentry_offset(dn);
+ igrab(in);
+ } else if (ceph_ino(in) == vino.ino &&
+ ceph_snap(in) == vino.snap) {
+ igrab(in);
+ } else {
+ dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
+ dn, in, ceph_ino(in), ceph_snap(in),
+ vino.ino, vino.snap);
+ have_lease = false;
+ in = NULL;
+ }
+
+ if (have_lease)
+ update_dentry_lease(dn, rinfo->dlease, session,
+ req->r_request_started);
+ dout(" final dn %p\n", dn);
+ i++;
+ } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
+ req->r_op == CEPH_MDS_OP_MKSNAP) {
+ struct dentry *dn = req->r_dentry;
+
+ /* fill out a snapdir LOOKUPSNAP dentry */
+ BUG_ON(!dn);
+ BUG_ON(!req->r_locked_dir);
+ BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
+ ininfo = rinfo->targeti.in;
+ vino.ino = le64_to_cpu(ininfo->ino);
+ vino.snap = le64_to_cpu(ininfo->snapid);
+ in = ceph_get_inode(sb, vino);
+ if (IS_ERR(in)) {
+ pr_err("fill_inode get_inode badness %llx.%llx\n",
+ vino.ino, vino.snap);
+ err = PTR_ERR(in);
+ d_delete(dn);
+ goto done;
+ }
+ dout(" linking snapped dir %p to dn %p\n", in, dn);
+ dn = splice_dentry(dn, in, NULL);
+ if (IS_ERR(dn)) {
+ err = PTR_ERR(dn);
+ goto done;
+ }
+ ceph_set_dentry_offset(dn);
+ req->r_dentry = dn; /* may have spliced */
+ igrab(in);
+ rinfo->head->is_dentry = 1; /* fool notrace handlers */
+ }
+
+ if (rinfo->head->is_target) {
+ vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
+ vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
+
+ if (in == NULL || ceph_ino(in) != vino.ino ||
+ ceph_snap(in) != vino.snap) {
+ in = ceph_get_inode(sb, vino);
+ if (IS_ERR(in)) {
+ err = PTR_ERR(in);
+ goto done;
+ }
+ }
+ req->r_target_inode = in;
+
+ err = fill_inode(in,
+ &rinfo->targeti, NULL,
+ session, req->r_request_started,
+ (le32_to_cpu(rinfo->head->result) == 0) ?
+ req->r_fmode : -1,
+ &req->r_caps_reservation);
+ if (err < 0) {
+ pr_err("fill_inode badness %p %llx.%llx\n",
+ in, ceph_vinop(in));
+ goto done;
+ }
+ }
+
+done:
+ dout("fill_trace done err=%d\n", err);
+ return err;
+}
+
+/*
+ * Prepopulate our cache with readdir results, leases, etc.
+ */
+int ceph_readdir_prepopulate(struct ceph_mds_request *req,
+ struct ceph_mds_session *session)
+{
+ struct dentry *parent = req->r_dentry;
+ struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
+ struct qstr dname;
+ struct dentry *dn;
+ struct inode *in;
+ int err = 0, i;
+ struct inode *snapdir = NULL;
+ struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
+ u64 frag = le32_to_cpu(rhead->args.readdir.frag);
+ struct ceph_dentry_info *di;
+
+ if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
+ snapdir = ceph_get_snapdir(parent->d_inode);
+ parent = d_find_alias(snapdir);
+ dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
+ rinfo->dir_nr, parent);
+ } else {
+ dout("readdir_prepopulate %d items under dn %p\n",
+ rinfo->dir_nr, parent);
+ if (rinfo->dir_dir)
+ ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
+ }
+
+ for (i = 0; i < rinfo->dir_nr; i++) {
+ struct ceph_vino vino;
+
+ dname.name = rinfo->dir_dname[i];
+ dname.len = rinfo->dir_dname_len[i];
+ dname.hash = full_name_hash(dname.name, dname.len);
+
+ vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
+ vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
+
+retry_lookup:
+ dn = d_lookup(parent, &dname);
+ dout("d_lookup on parent=%p name=%.*s got %p\n",
+ parent, dname.len, dname.name, dn);
+
+ if (!dn) {
+ dn = d_alloc(parent, &dname);
+ dout("d_alloc %p '%.*s' = %p\n", parent,
+ dname.len, dname.name, dn);
+ if (dn == NULL) {
+ dout("d_alloc badness\n");
+ err = -ENOMEM;
+ goto out;
+ }
+ err = ceph_init_dentry(dn);
+ if (err < 0)
+ goto out;
+ } else if (dn->d_inode &&
+ (ceph_ino(dn->d_inode) != vino.ino ||
+ ceph_snap(dn->d_inode) != vino.snap)) {
+ dout(" dn %p points to wrong inode %p\n",
+ dn, dn->d_inode);
+ d_delete(dn);
+ dput(dn);
+ goto retry_lookup;
+ } else {
+ /* reorder parent's d_subdirs */
+ spin_lock(&dcache_lock);
+ spin_lock(&dn->d_lock);
+ list_move(&dn->d_u.d_child, &parent->d_subdirs);
+ spin_unlock(&dn->d_lock);
+ spin_unlock(&dcache_lock);
+ }
+
+ di = dn->d_fsdata;
+ di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
+
+ /* inode */
+ if (dn->d_inode) {
+ in = dn->d_inode;
+ } else {
+ in = ceph_get_inode(parent->d_sb, vino);
+ if (in == NULL) {
+ dout("new_inode badness\n");
+ d_delete(dn);
+ dput(dn);
+ err = -ENOMEM;
+ goto out;
+ }
+ dn = splice_dentry(dn, in, NULL);
+ }
+
+ if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
+ req->r_request_started, -1,
+ &req->r_caps_reservation) < 0) {
+ pr_err("fill_inode badness on %p\n", in);
+ dput(dn);
+ continue;
+ }
+ update_dentry_lease(dn, rinfo->dir_dlease[i],
+ req->r_session, req->r_request_started);
+ dput(dn);
+ }
+ req->r_did_prepopulate = true;
+
+out:
+ if (snapdir) {
+ iput(snapdir);
+ dput(parent);
+ }
+ dout("readdir_prepopulate done\n");
+ return err;
+}
+
+int ceph_inode_set_size(struct inode *inode, loff_t size)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ int ret = 0;
+
+ spin_lock(&inode->i_lock);
+ dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
+ inode->i_size = size;
+ inode->i_blocks = (size + (1 << 9) - 1) >> 9;
+
+ /* tell the MDS if we are approaching max_size */
+ if ((size << 1) >= ci->i_max_size &&
+ (ci->i_reported_size << 1) < ci->i_max_size)
+ ret = 1;
+
+ spin_unlock(&inode->i_lock);
+ return ret;
+}
+
+/*
+ * Write back inode data in a worker thread. (This can't be done
+ * in the message handler context.)
+ */
+void ceph_queue_writeback(struct inode *inode)
+{
+ if (queue_work(ceph_inode_to_client(inode)->wb_wq,
+ &ceph_inode(inode)->i_wb_work)) {
+ dout("ceph_queue_writeback %p\n", inode);
+ igrab(inode);
+ } else {
+ dout("ceph_queue_writeback %p failed\n", inode);
+ }
+}
+
+static void ceph_writeback_work(struct work_struct *work)
+{
+ struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
+ i_wb_work);
+ struct inode *inode = &ci->vfs_inode;
+
+ dout("writeback %p\n", inode);
+ filemap_fdatawrite(&inode->i_data);
+ iput(inode);
+}
+
+/*
+ * queue an async invalidation
+ */
+void ceph_queue_invalidate(struct inode *inode)
+{
+ if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
+ &ceph_inode(inode)->i_pg_inv_work)) {
+ dout("ceph_queue_invalidate %p\n", inode);
+ igrab(inode);
+ } else {
+ dout("ceph_queue_invalidate %p failed\n", inode);
+ }
+}
+
+/*
+ * invalidate any pages that are not dirty or under writeback. this
+ * includes pages that are clean and mapped.
+ */
+static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
+{
+ struct pagevec pvec;
+ pgoff_t next = 0;
+ int i;
+
+ pagevec_init(&pvec, 0);
+ while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
+ for (i = 0; i < pagevec_count(&pvec); i++) {
+ struct page *page = pvec.pages[i];
+ pgoff_t index;
+ int skip_page =
+ (PageDirty(page) || PageWriteback(page));
+
+ if (!skip_page)
+ skip_page = !trylock_page(page);
+
+ /*
+ * We really shouldn't be looking at the ->index of an
+ * unlocked page. But we're not allowed to lock these
+ * pages. So we rely upon nobody altering the ->index
+ * of this (pinned-by-us) page.
+ */
+ index = page->index;
+ if (index > next)
+ next = index;
+ next++;
+
+ if (skip_page)
+ continue;
+
+ generic_error_remove_page(mapping, page);
+ unlock_page(page);
+ }
+ pagevec_release(&pvec);
+ cond_resched();
+ }
+}
+
+/*
+ * Invalidate inode pages in a worker thread. (This can't be done
+ * in the message handler context.)
+ */
+static void ceph_invalidate_work(struct work_struct *work)
+{
+ struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
+ i_pg_inv_work);
+ struct inode *inode = &ci->vfs_inode;
+ u32 orig_gen;
+ int check = 0;
+
+ spin_lock(&inode->i_lock);
+ dout("invalidate_pages %p gen %d revoking %d\n", inode,
+ ci->i_rdcache_gen, ci->i_rdcache_revoking);
+ if (ci->i_rdcache_gen == 0 ||
+ ci->i_rdcache_revoking != ci->i_rdcache_gen) {
+ BUG_ON(ci->i_rdcache_revoking > ci->i_rdcache_gen);
+ /* nevermind! */
+ ci->i_rdcache_revoking = 0;
+ spin_unlock(&inode->i_lock);
+ goto out;
+ }
+ orig_gen = ci->i_rdcache_gen;
+ spin_unlock(&inode->i_lock);
+
+ ceph_invalidate_nondirty_pages(inode->i_mapping);
+
+ spin_lock(&inode->i_lock);
+ if (orig_gen == ci->i_rdcache_gen) {
+ dout("invalidate_pages %p gen %d successful\n", inode,
+ ci->i_rdcache_gen);
+ ci->i_rdcache_gen = 0;
+ ci->i_rdcache_revoking = 0;
+ check = 1;
+ } else {
+ dout("invalidate_pages %p gen %d raced, gen now %d\n",
+ inode, orig_gen, ci->i_rdcache_gen);
+ }
+ spin_unlock(&inode->i_lock);
+
+ if (check)
+ ceph_check_caps(ci, 0, NULL);
+out:
+ iput(inode);
+}
+
+
+/*
+ * called by trunc_wq; take i_mutex ourselves
+ *
+ * We also truncate in a separate thread as well.
+ */
+static void ceph_vmtruncate_work(struct work_struct *work)
+{
+ struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
+ i_vmtruncate_work);
+ struct inode *inode = &ci->vfs_inode;
+
+ dout("vmtruncate_work %p\n", inode);
+ mutex_lock(&inode->i_mutex);
+ __ceph_do_pending_vmtruncate(inode);
+ mutex_unlock(&inode->i_mutex);
+ iput(inode);
+}
+
+/*
+ * Queue an async vmtruncate. If we fail to queue work, we will handle
+ * the truncation the next time we call __ceph_do_pending_vmtruncate.
+ */
+void ceph_queue_vmtruncate(struct inode *inode)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+
+ if (queue_work(ceph_client(inode->i_sb)->trunc_wq,
+ &ci->i_vmtruncate_work)) {
+ dout("ceph_queue_vmtruncate %p\n", inode);
+ igrab(inode);
+ } else {
+ dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
+ inode, ci->i_truncate_pending);
+ }
+}
+
+/*
+ * called with i_mutex held.
+ *
+ * Make sure any pending truncation is applied before doing anything
+ * that may depend on it.
+ */
+void __ceph_do_pending_vmtruncate(struct inode *inode)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ u64 to;
+ int wrbuffer_refs, wake = 0;
+
+retry:
+ spin_lock(&inode->i_lock);
+ if (ci->i_truncate_pending == 0) {
+ dout("__do_pending_vmtruncate %p none pending\n", inode);
+ spin_unlock(&inode->i_lock);
+ return;
+ }
+
+ /*
+ * make sure any dirty snapped pages are flushed before we
+ * possibly truncate them.. so write AND block!
+ */
+ if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
+ dout("__do_pending_vmtruncate %p flushing snaps first\n",
+ inode);
+ spin_unlock(&inode->i_lock);
+ filemap_write_and_wait_range(&inode->i_data, 0,
+ inode->i_sb->s_maxbytes);
+ goto retry;
+ }
+
+ to = ci->i_truncate_size;
+ wrbuffer_refs = ci->i_wrbuffer_ref;
+ dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
+ ci->i_truncate_pending, to);
+ spin_unlock(&inode->i_lock);
+
+ truncate_inode_pages(inode->i_mapping, to);
+
+ spin_lock(&inode->i_lock);
+ ci->i_truncate_pending--;
+ if (ci->i_truncate_pending == 0)
+ wake = 1;
+ spin_unlock(&inode->i_lock);
+
+ if (wrbuffer_refs == 0)
+ ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
+ if (wake)
+ wake_up(&ci->i_cap_wq);
+}
+
+
+/*
+ * symlinks
+ */
+static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
+ nd_set_link(nd, ci->i_symlink);
+ return NULL;
+}
+
+static const struct inode_operations ceph_symlink_iops = {
+ .readlink = generic_readlink,
+ .follow_link = ceph_sym_follow_link,
+};
+
+/*
+ * setattr
+ */
+int ceph_setattr(struct dentry *dentry, struct iattr *attr)
+{
+ struct inode *inode = dentry->d_inode;
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct inode *parent_inode = dentry->d_parent->d_inode;
+ const unsigned int ia_valid = attr->ia_valid;
+ struct ceph_mds_request *req;
+ struct ceph_mds_client *mdsc = &ceph_client(dentry->d_sb)->mdsc;
+ int issued;
+ int release = 0, dirtied = 0;
+ int mask = 0;
+ int err = 0;
+
+ if (ceph_snap(inode) != CEPH_NOSNAP)
+ return -EROFS;
+
+ __ceph_do_pending_vmtruncate(inode);
+
+ err = inode_change_ok(inode, attr);
+ if (err != 0)
+ return err;
+
+ req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
+ USE_AUTH_MDS);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ spin_lock(&inode->i_lock);
+ issued = __ceph_caps_issued(ci, NULL);
+ dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
+
+ if (ia_valid & ATTR_UID) {
+ dout("setattr %p uid %d -> %d\n", inode,
+ inode->i_uid, attr->ia_uid);
+ if (issued & CEPH_CAP_AUTH_EXCL) {
+ inode->i_uid = attr->ia_uid;
+ dirtied |= CEPH_CAP_AUTH_EXCL;
+ } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
+ attr->ia_uid != inode->i_uid) {
+ req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
+ mask |= CEPH_SETATTR_UID;
+ release |= CEPH_CAP_AUTH_SHARED;
+ }
+ }
+ if (ia_valid & ATTR_GID) {
+ dout("setattr %p gid %d -> %d\n", inode,
+ inode->i_gid, attr->ia_gid);
+ if (issued & CEPH_CAP_AUTH_EXCL) {
+ inode->i_gid = attr->ia_gid;
+ dirtied |= CEPH_CAP_AUTH_EXCL;
+ } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
+ attr->ia_gid != inode->i_gid) {
+ req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
+ mask |= CEPH_SETATTR_GID;
+ release |= CEPH_CAP_AUTH_SHARED;
+ }
+ }
+ if (ia_valid & ATTR_MODE) {
+ dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
+ attr->ia_mode);
+ if (issued & CEPH_CAP_AUTH_EXCL) {
+ inode->i_mode = attr->ia_mode;
+ dirtied |= CEPH_CAP_AUTH_EXCL;
+ } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
+ attr->ia_mode != inode->i_mode) {
+ req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
+ mask |= CEPH_SETATTR_MODE;
+ release |= CEPH_CAP_AUTH_SHARED;
+ }
+ }
+
+ if (ia_valid & ATTR_ATIME) {
+ dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
+ inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
+ attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
+ if (issued & CEPH_CAP_FILE_EXCL) {
+ ci->i_time_warp_seq++;
+ inode->i_atime = attr->ia_atime;
+ dirtied |= CEPH_CAP_FILE_EXCL;
+ } else if ((issued & CEPH_CAP_FILE_WR) &&
+ timespec_compare(&inode->i_atime,
+ &attr->ia_atime) < 0) {
+ inode->i_atime = attr->ia_atime;
+ dirtied |= CEPH_CAP_FILE_WR;
+ } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
+ !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
+ ceph_encode_timespec(&req->r_args.setattr.atime,
+ &attr->ia_atime);
+ mask |= CEPH_SETATTR_ATIME;
+ release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
+ CEPH_CAP_FILE_WR;
+ }
+ }
+ if (ia_valid & ATTR_MTIME) {
+ dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
+ inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
+ attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
+ if (issued & CEPH_CAP_FILE_EXCL) {
+ ci->i_time_warp_seq++;
+ inode->i_mtime = attr->ia_mtime;
+ dirtied |= CEPH_CAP_FILE_EXCL;
+ } else if ((issued & CEPH_CAP_FILE_WR) &&
+ timespec_compare(&inode->i_mtime,
+ &attr->ia_mtime) < 0) {
+ inode->i_mtime = attr->ia_mtime;
+ dirtied |= CEPH_CAP_FILE_WR;
+ } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
+ !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
+ ceph_encode_timespec(&req->r_args.setattr.mtime,
+ &attr->ia_mtime);
+ mask |= CEPH_SETATTR_MTIME;
+ release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
+ CEPH_CAP_FILE_WR;
+ }
+ }
+ if (ia_valid & ATTR_SIZE) {
+ dout("setattr %p size %lld -> %lld\n", inode,
+ inode->i_size, attr->ia_size);
+ if (attr->ia_size > inode->i_sb->s_maxbytes) {
+ err = -EINVAL;
+ goto out;
+ }
+ if ((issued & CEPH_CAP_FILE_EXCL) &&
+ attr->ia_size > inode->i_size) {
+ inode->i_size = attr->ia_size;
+ inode->i_blocks =
+ (attr->ia_size + (1 << 9) - 1) >> 9;
+ inode->i_ctime = attr->ia_ctime;
+ ci->i_reported_size = attr->ia_size;
+ dirtied |= CEPH_CAP_FILE_EXCL;
+ } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
+ attr->ia_size != inode->i_size) {
+ req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
+ req->r_args.setattr.old_size =
+ cpu_to_le64(inode->i_size);
+ mask |= CEPH_SETATTR_SIZE;
+ release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
+ CEPH_CAP_FILE_WR;
+ }
+ }
+
+ /* these do nothing */
+ if (ia_valid & ATTR_CTIME) {
+ bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
+ ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
+ dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
+ inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
+ attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
+ only ? "ctime only" : "ignored");
+ inode->i_ctime = attr->ia_ctime;
+ if (only) {
+ /*
+ * if kernel wants to dirty ctime but nothing else,
+ * we need to choose a cap to dirty under, or do
+ * a almost-no-op setattr
+ */
+ if (issued & CEPH_CAP_AUTH_EXCL)
+ dirtied |= CEPH_CAP_AUTH_EXCL;
+ else if (issued & CEPH_CAP_FILE_EXCL)
+ dirtied |= CEPH_CAP_FILE_EXCL;
+ else if (issued & CEPH_CAP_XATTR_EXCL)
+ dirtied |= CEPH_CAP_XATTR_EXCL;
+ else
+ mask |= CEPH_SETATTR_CTIME;
+ }
+ }
+ if (ia_valid & ATTR_FILE)
+ dout("setattr %p ATTR_FILE ... hrm!\n", inode);
+
+ if (dirtied) {
+ __ceph_mark_dirty_caps(ci, dirtied);
+ inode->i_ctime = CURRENT_TIME;
+ }
+
+ release &= issued;
+ spin_unlock(&inode->i_lock);
+
+ if (mask) {
+ req->r_inode = igrab(inode);
+ req->r_inode_drop = release;
+ req->r_args.setattr.mask = cpu_to_le32(mask);
+ req->r_num_caps = 1;
+ err = ceph_mdsc_do_request(mdsc, parent_inode, req);
+ }
+ dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
+ ceph_cap_string(dirtied), mask);
+
+ ceph_mdsc_put_request(req);
+ __ceph_do_pending_vmtruncate(inode);
+ return err;
+out:
+ spin_unlock(&inode->i_lock);
+ ceph_mdsc_put_request(req);
+ return err;
+}
+
+/*
+ * Verify that we have a lease on the given mask. If not,
+ * do a getattr against an mds.
+ */
+int ceph_do_getattr(struct inode *inode, int mask)
+{
+ struct ceph_client *client = ceph_sb_to_client(inode->i_sb);
+ struct ceph_mds_client *mdsc = &client->mdsc;
+ struct ceph_mds_request *req;
+ int err;
+
+ if (ceph_snap(inode) == CEPH_SNAPDIR) {
+ dout("do_getattr inode %p SNAPDIR\n", inode);
+ return 0;
+ }
+
+ dout("do_getattr inode %p mask %s\n", inode, ceph_cap_string(mask));
+ if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
+ return 0;
+
+ req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+ req->r_inode = igrab(inode);
+ req->r_num_caps = 1;
+ req->r_args.getattr.mask = cpu_to_le32(mask);
+ err = ceph_mdsc_do_request(mdsc, NULL, req);
+ ceph_mdsc_put_request(req);
+ dout("do_getattr result=%d\n", err);
+ return err;
+}
+
+
+/*
+ * Check inode permissions. We verify we have a valid value for
+ * the AUTH cap, then call the generic handler.
+ */
+int ceph_permission(struct inode *inode, int mask)
+{
+ int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
+
+ if (!err)
+ err = generic_permission(inode, mask, NULL);
+ return err;
+}
+
+/*
+ * Get all attributes. Hopefully somedata we'll have a statlite()
+ * and can limit the fields we require to be accurate.
+ */
+int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
+ struct kstat *stat)
+{
+ struct inode *inode = dentry->d_inode;
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ int err;
+
+ err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
+ if (!err) {
+ generic_fillattr(inode, stat);
+ stat->ino = inode->i_ino;
+ if (ceph_snap(inode) != CEPH_NOSNAP)
+ stat->dev = ceph_snap(inode);
+ else
+ stat->dev = 0;
+ if (S_ISDIR(inode->i_mode)) {
+ stat->size = ci->i_rbytes;
+ stat->blocks = 0;
+ stat->blksize = 65536;
+ }
+ }
+ return err;
+}
generated by cgit v1.1 at 2024-12-27 05:41:34 +0000