X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Fllite%2Fsymlink.c;h=7095955d6da8fec83fb5f9a0111785289caaf2b8;hb=3f4b4fb333c6d27313970c23ceabdd9d9bb81a98;hp=a999ea18a4d896d17a7b82b1ac3bb43eefff2b6d;hpb=65701b4a30efdb695776bcf690a2b3cabc928da1;p=fs%2Flustre-release.git diff --git a/lustre/llite/symlink.c b/lustre/llite/symlink.c index a999ea1..7095955 100644 --- a/lustre/llite/symlink.c +++ b/lustre/llite/symlink.c @@ -1,6 +1,4 @@ -/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- - * vim:expandtab:shiftwidth=8:tabstop=8: - * +/* * GPL HEADER START * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. @@ -17,11 +15,7 @@ * * You should have received a copy of the GNU General Public License * version 2 along with this program; If not, see - * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf - * - * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, - * CA 95054 USA or visit www.sun.com if you need additional information or - * have any questions. + * http://www.gnu.org/licenses/gpl-2.0.html * * GPL HEADER END */ @@ -29,7 +23,7 @@ * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. * - * Copyright (c) 2011, Whamcloud, Inc. + * Copyright (c) 2011, 2014, Intel Corporation. */ /* * This file is part of Lustre, http://www.lustre.org/ @@ -39,11 +33,9 @@ #include #include #include -#include #include #define DEBUG_SUBSYSTEM S_LLITE -#include #include "llite_internal.h" static int ll_readlink_internal(struct inode *inode, @@ -58,11 +50,18 @@ static int ll_readlink_internal(struct inode *inode, *request = NULL; - if (lli->lli_symlink_name) { - *symname = lli->lli_symlink_name; - CDEBUG(D_INODE, "using cached symlink %s\n", *symname); - RETURN(0); - } + if (lli->lli_symlink_name) { + int print_limit = min_t(int, PAGE_SIZE - 128, symlen); + + *symname = lli->lli_symlink_name; + /* If the total CDEBUG() size is larger than a page, it + * will print a warning to the console, avoid this by + * printing just the last part of the symlink. */ + CDEBUG(D_INODE, "using cached symlink %s%.*s, len = %d\n", + print_limit < symlen ? "..." : "", print_limit, + (*symname) + symlen - print_limit, symlen); + RETURN(0); + } op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, symlen, LUSTRE_OPC_ANY, NULL); @@ -74,21 +73,25 @@ static int ll_readlink_internal(struct inode *inode, ll_finish_md_op_data(op_data); if (rc) { if (rc != -ENOENT) - CERROR("inode %lu: rc = %d\n", inode->i_ino, rc); + CERROR("%s: inode "DFID": rc = %d\n", + ll_get_fsname(inode->i_sb, NULL, 0), + PFID(ll_inode2fid(inode)), rc); GOTO (failed, rc); } body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY); LASSERT(body != NULL); - if ((body->valid & OBD_MD_LINKNAME) == 0) { - CERROR("OBD_MD_LINKNAME not set on reply\n"); - GOTO(failed, rc = -EPROTO); - } - - LASSERT(symlen != 0); - if (body->eadatasize != symlen) { - CERROR("inode %lu: symlink length %d not expected %d\n", - inode->i_ino, body->eadatasize - 1, symlen - 1); + if ((body->mbo_valid & OBD_MD_LINKNAME) == 0) { + CERROR("OBD_MD_LINKNAME not set on reply\n"); + GOTO(failed, rc = -EPROTO); + } + + LASSERT(symlen != 0); + if (body->mbo_eadatasize != symlen) { + CERROR("%s: inode "DFID": symlink length %d not expected %d\n", + ll_get_fsname(inode->i_sb, NULL, 0), + PFID(ll_inode2fid(inode)), body->mbo_eadatasize - 1, + symlen - 1); GOTO(failed, rc = -EPROTO); } @@ -96,8 +99,9 @@ static int ll_readlink_internal(struct inode *inode, if (*symname == NULL || strnlen(*symname, symlen) != symlen - 1) { /* not full/NULL terminated */ - CERROR("inode %lu: symlink not NULL terminated string" - "of length %d\n", inode->i_ino, symlen - 1); + CERROR("%s: inode "DFID": symlink not NULL terminated string" + "of length %d\n", ll_get_fsname(inode->i_sb, NULL, 0), + PFID(ll_inode2fid(inode)), symlen - 1); GOTO(failed, rc = -EPROTO); } @@ -113,42 +117,28 @@ failed: RETURN (rc); } -static int ll_readlink(struct dentry *dentry, char *buffer, int buflen) -{ - struct inode *inode = dentry->d_inode; - struct ptlrpc_request *request; - char *symname; - int rc; - ENTRY; - - CDEBUG(D_VFSTRACE, "VFS Op\n"); - /* on symlinks lli_open_sem protects lli_symlink_name allocation/data */ - ll_inode_size_lock(inode, 0); - rc = ll_readlink_internal(inode, &request, &symname); - if (rc) - GOTO(out, rc); - - rc = vfs_readlink(dentry, buffer, buflen, symname); - out: - ptlrpc_req_finished(request); - ll_inode_size_unlock(inode, 0); - RETURN(rc); -} - -#ifdef HAVE_COOKIE_FOLLOW_LINK -# define LL_FOLLOW_LINK_RETURN_TYPE void * +#ifdef HAVE_SYMLINK_OPS_USE_NAMEIDATA +static void ll_put_link(struct dentry *dentry, + struct nameidata *nd, void *cookie) #else -# define LL_FOLLOW_LINK_RETURN_TYPE int +# ifdef HAVE_IOP_GET_LINK +static void ll_put_link(void *cookie) +# else +static void ll_put_link(struct inode *unused, void *cookie) +# endif #endif +{ + ptlrpc_req_finished(cookie); +} -static LL_FOLLOW_LINK_RETURN_TYPE ll_follow_link(struct dentry *dentry, - struct nameidata *nd) +#ifdef HAVE_SYMLINK_OPS_USE_NAMEIDATA +static void *ll_follow_link(struct dentry *dentry, struct nameidata *nd) { - struct inode *inode = dentry->d_inode; - struct ptlrpc_request *request = NULL; - int rc; - char *symname; - ENTRY; + struct inode *inode = dentry->d_inode; + struct ptlrpc_request *request = NULL; + int rc; + char *symname = NULL; + ENTRY; CDEBUG(D_VFSTRACE, "VFS Op\n"); /* Limit the recursive symlink depth to 5 instead of default @@ -159,58 +149,92 @@ static LL_FOLLOW_LINK_RETURN_TYPE ll_follow_link(struct dentry *dentry, } else if (THREAD_SIZE == 8192 && current->link_count >= 8) { rc = -ELOOP; } else { - ll_inode_size_lock(inode, 0); - rc = ll_readlink_internal(inode, &request, &symname); - ll_inode_size_unlock(inode, 0); - } - if (rc) { - cfs_path_put(nd); /* Kernel assumes that ->follow_link() - releases nameidata on error */ - GOTO(out, rc); + ll_inode_size_lock(inode); + rc = ll_readlink_internal(inode, &request, &symname); + ll_inode_size_unlock(inode); } - -#ifdef HAVE_COOKIE_FOLLOW_LINK - nd_set_link(nd, symname); - /* @symname may contain a pointer to the request message buffer, - we delay request releasing until ll_put_link then. */ - RETURN(request); -#else - if (lli->lli_symlink_name == NULL) { - /* falling back to recursive follow link if the request - * needs to be cleaned up still. */ - rc = vfs_follow_link(nd, symname); - GOTO(out, rc); - } - nd_set_link(nd, symname); - RETURN(0); -#endif -out: - ptlrpc_req_finished(request); -#ifdef HAVE_COOKIE_FOLLOW_LINK - RETURN(ERR_PTR(rc)); + if (rc) { + ptlrpc_req_finished(request); + request = NULL; + symname = ERR_PTR(rc); + } + + nd_set_link(nd, symname); + /* symname may contain a pointer to the request message buffer, + * we delay request releasing until ll_put_link then. + */ + RETURN(request); +} #else - RETURN(rc); -#endif +# ifdef HAVE_IOP_GET_LINK +static const char *ll_get_link(struct dentry *dentry, + struct inode *inode, + struct delayed_call *done) +{ + struct ptlrpc_request *request; + char *symname = NULL; + int rc; + + ENTRY; + CDEBUG(D_VFSTRACE, "VFS Op\n"); + if (!dentry) + RETURN(ERR_PTR(-ECHILD)); + ll_inode_size_lock(inode); + rc = ll_readlink_internal(inode, &request, &symname); + ll_inode_size_unlock(inode); + if (rc < 0) { + ptlrpc_req_finished(request); + return ERR_PTR(rc); + } + + /* symname may contain a pointer to the request message buffer, + * we delay request releasing then. + */ + set_delayed_call(done, ll_put_link, request); + RETURN(symname); } - -#ifdef HAVE_COOKIE_FOLLOW_LINK -static void ll_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie) +# else +static const char *ll_follow_link(struct dentry *dentry, void **cookie) { - ptlrpc_req_finished(cookie); + struct inode *inode = d_inode(dentry); + struct ptlrpc_request *request; + char *symname = NULL; + int rc; + ENTRY; + + CDEBUG(D_VFSTRACE, "VFS Op\n"); + ll_inode_size_lock(inode); + rc = ll_readlink_internal(inode, &request, &symname); + ll_inode_size_unlock(inode); + if (rc < 0) { + ptlrpc_req_finished(request); + return ERR_PTR(rc); + } + + /* symname may contain a pointer to the request message buffer, + * we delay request releasing until ll_put_link then. + */ + *cookie = request; + RETURN(symname); } -#endif +# endif /* HAVE_IOP_GET_LINK */ +#endif /* HAVE_SYMLINK_OPS_USE_NAMEIDATA */ struct inode_operations ll_fast_symlink_inode_operations = { - .readlink = ll_readlink, - .setattr = ll_setattr, - .follow_link = ll_follow_link, -#ifdef HAVE_COOKIE_FOLLOW_LINK - .put_link = ll_put_link, +#ifdef HAVE_IOP_GENERIC_READLINK + .readlink = generic_readlink, +#endif + .setattr = ll_setattr, +#ifdef HAVE_IOP_GET_LINK + .get_link = ll_get_link, +#else + .follow_link = ll_follow_link, + .put_link = ll_put_link, #endif - .getattr = ll_getattr, - .permission = ll_inode_permission, - .setxattr = ll_setxattr, - .getxattr = ll_getxattr, - .listxattr = ll_listxattr, - .removexattr = ll_removexattr, + .getattr = ll_getattr, + .permission = ll_inode_permission, + .setxattr = ll_setxattr, + .getxattr = ll_getxattr, + .listxattr = ll_listxattr, + .removexattr = ll_removexattr, };