cregit-Linux how code gets into the kernel

Release 4.10 fs/gfs2/inode.c

Directory: fs/gfs2
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/namei.h>
#include <linux/mm.h>
#include <linux/xattr.h>
#include <linux/posix_acl.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/fiemap.h>
#include <linux/security.h>
#include <linux/uaccess.h>

#include "gfs2.h"
#include "incore.h"
#include "acl.h"
#include "bmap.h"
#include "dir.h"
#include "xattr.h"
#include "glock.h"
#include "inode.h"
#include "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
#include "util.h"
#include "super.h"
#include "glops.h"

static int iget_test(struct inode *inode, void *opaque) { u64 no_addr = *(u64 *)opaque; return GFS2_I(inode)->i_no_addr == no_addr; }


andreas gruenbacherandreas gruenbacher3291.43%150.00%
steven whitehousesteven whitehouse38.57%150.00%

static int iget_set(struct inode *inode, void *opaque) { u64 no_addr = *(u64 *)opaque; GFS2_I(inode)->i_no_addr = no_addr; inode->i_ino = no_addr; return 0; }


andreas gruenbacherandreas gruenbacher43100.00%1100.00%

static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr) { struct inode *inode; repeat: inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr); if (!inode) return inode; if (is_bad_inode(inode)) { iput(inode); goto repeat; } return inode; }


andreas gruenbacherandreas gruenbacher5074.63%266.67%
steven whitehousesteven whitehouse1725.37%133.33%

/** * gfs2_set_iop - Sets inode operations * @inode: The inode with correct i_mode filled in * * GFS2 lookup code fills in vfs inode contents based on info obtained * from directory entry inside gfs2_inode_lookup(). */
static void gfs2_set_iop(struct inode *inode) { struct gfs2_sbd *sdp = GFS2_SB(inode); umode_t mode = inode->i_mode; if (S_ISREG(mode)) { inode->i_op = &gfs2_file_iops; if (gfs2_localflocks(sdp)) inode->i_fop = &gfs2_file_fops_nolock; else inode->i_fop = &gfs2_file_fops; } else if (S_ISDIR(mode)) { inode->i_op = &gfs2_dir_iops; if (gfs2_localflocks(sdp)) inode->i_fop = &gfs2_dir_fops_nolock; else inode->i_fop = &gfs2_dir_fops; } else if (S_ISLNK(mode)) { inode->i_op = &gfs2_symlink_iops; } else { inode->i_op = &gfs2_file_iops; init_special_inode(inode, inode->i_mode, inode->i_rdev); } }


steven whitehousesteven whitehouse145100.00%1100.00%

/** * gfs2_inode_lookup - Lookup an inode * @sb: The super block * @type: The type of the inode * @no_addr: The inode number * @no_formal_ino: The inode generation number * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED; * GFS2_BLKST_FREE do indicate not to verify) * * If @type is DT_UNKNOWN, the inode type is fetched from disk. * * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a * placeholder because it doesn't otherwise make sense), the on-disk block type * is verified to be @blktype. * * Returns: A VFS inode, or an error */
struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, u64 no_addr, u64 no_formal_ino, unsigned int blktype) { struct inode *inode; struct gfs2_inode *ip; struct gfs2_glock *io_gl = NULL; struct gfs2_holder i_gh; int error; gfs2_holder_mark_uninitialized(&i_gh); inode = gfs2_iget(sb, no_addr); if (!inode) return ERR_PTR(-ENOMEM); ip = GFS2_I(inode); if (inode->i_state & I_NEW) { struct gfs2_sbd *sdp = GFS2_SB(inode); ip->i_no_formal_ino = no_formal_ino; error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); if (unlikely(error)) goto fail; ip->i_gl->gl_object = ip; error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); if (unlikely(error)) goto fail_put; if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) { /* * The GL_SKIP flag indicates to skip reading the inode * block. We read the inode with gfs2_inode_refresh * after possibly checking the block type. */ error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &i_gh); if (error) goto fail_put; if (blktype != GFS2_BLKST_FREE) { error = gfs2_check_blk_type(sdp, no_addr, blktype); if (error) goto fail_put; } } set_bit(GIF_INVALID, &ip->i_flags); error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); if (unlikely(error)) goto fail_put; ip->i_iopen_gh.gh_gl->gl_object = ip; gfs2_glock_put(io_gl); io_gl = NULL; if (type == DT_UNKNOWN) { /* Inode glock must be locked already */ error = gfs2_inode_refresh(GFS2_I(inode)); if (error) goto fail_refresh; } else { inode->i_mode = DT2IF(type); } gfs2_set_iop(inode); inode->i_atime.tv_sec = 0; inode->i_atime.tv_nsec = 0; unlock_new_inode(inode); } if (gfs2_holder_initialized(&i_gh)) gfs2_glock_dq_uninit(&i_gh); return inode; fail_refresh: ip->i_iopen_gh.gh_flags |= GL_NOCACHE; ip->i_iopen_gh.gh_gl->gl_object = NULL; gfs2_glock_dq_wait(&ip->i_iopen_gh); gfs2_holder_uninit(&ip->i_iopen_gh); fail_put: if (io_gl) gfs2_glock_put(io_gl); if (gfs2_holder_initialized(&i_gh)) gfs2_glock_dq_uninit(&i_gh); ip->i_gl->gl_object = NULL; fail: iget_failed(inode); return ERR_PTR(error); }


steven whitehousesteven whitehouse30266.52%114.29%
andreas gruenbacherandreas gruenbacher12327.09%342.86%
robert s. petersonrobert s. peterson296.39%342.86%

struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, u64 *no_formal_ino, unsigned int blktype) { struct super_block *sb = sdp->sd_vfs; struct inode *inode; int error; inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, blktype); if (IS_ERR(inode)) return inode; /* Two extra checks for NFS only */ if (no_formal_ino) { error = -ESTALE; if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino) goto fail_iput; error = -EIO; if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) goto fail_iput; } return inode; fail_iput: iput(inode); return ERR_PTR(error); }


steven whitehousesteven whitehouse11691.34%150.00%
andreas gruenbacherandreas gruenbacher118.66%150.00%

struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) { struct qstr qstr; struct inode *inode; gfs2_str2qstr(&qstr, name); inode = gfs2_lookupi(dip, &qstr, 1); /* gfs2_lookupi has inconsistent callers: vfs * related routines expect NULL for no entry found, * gfs2_lookup_simple callers expect ENOENT * and do not check for NULL. */ if (inode == NULL) return ERR_PTR(-ENOENT); else return inode; }


steven whitehousesteven whitehouse64100.00%1100.00%

/** * gfs2_lookupi - Look up a filename in a directory and return its inode * @d_gh: An initialized holder for the directory glock * @name: The name of the inode to look for * @is_root: If 1, ignore the caller's permissions * @i_gh: An uninitialized holder for the new inode glock * * This can be called via the VFS filldir function when NFS is doing * a readdirplus and the inode which its intending to stat isn't * already in cache. In this case we must not take the directory glock * again, since the readdir call will have already taken that lock. * * Returns: errno */
struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, int is_root) { struct super_block *sb = dir->i_sb; struct gfs2_inode *dip = GFS2_I(dir); struct gfs2_holder d_gh; int error = 0; struct inode *inode = NULL; gfs2_holder_mark_uninitialized(&d_gh); if (!name->len || name->len > GFS2_FNAMESIZE) return ERR_PTR(-ENAMETOOLONG); if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || (name->len == 2 && memcmp(name->name, "..", 2) == 0 && dir == d_inode(sb->s_root))) { igrab(dir); return dir; } if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); if (error) return ERR_PTR(error); } if (!is_root) { error = gfs2_permission(dir, MAY_EXEC); if (error) goto out; } inode = gfs2_dir_search(dir, name, false); if (IS_ERR(inode)) error = PTR_ERR(inode); out: if (gfs2_holder_initialized(&d_gh)) gfs2_glock_dq_uninit(&d_gh); if (error == -ENOENT) return NULL; return inode ? inode : ERR_PTR(error); }


steven whitehousesteven whitehouse25494.78%250.00%
andreas gruenbacherandreas gruenbacher114.10%125.00%
david howellsdavid howells31.12%125.00%

/** * create_ok - OK to create a new on-disk inode here? * @dip: Directory in which dinode is to be created * @name: Name of new dinode * @mode: * * Returns: errno */
static int create_ok(struct gfs2_inode *dip, const struct qstr *name, umode_t mode) { int error; error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); if (error) return error; /* Don't create entries in an unlinked directory */ if (!dip->i_inode.i_nlink) return -ENOENT; if (dip->i_entries == (u32)-1) return -EFBIG; if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) return -EMLINK; return 0; }


steven whitehousesteven whitehouse9999.00%150.00%
al viroal viro11.00%150.00%

static void munge_mode_uid_gid(const struct gfs2_inode *dip, struct inode *inode) { if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && (dip->i_inode.i_mode & S_ISUID) && !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { if (S_ISDIR(inode->i_mode)) inode->i_mode |= S_ISUID; else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) inode->i_mode &= ~07111; inode->i_uid = dip->i_inode.i_uid; } else inode->i_uid = current_fsuid(); if (dip->i_inode.i_mode & S_ISGID) { if (S_ISDIR(inode->i_mode)) inode->i_mode |= S_ISGID; inode->i_gid = dip->i_inode.i_gid; } else inode->i_gid = current_fsgid(); }


steven whitehousesteven whitehouse14592.95%266.67%
eric w. biedermaneric w. biederman117.05%133.33%

static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; int error; error = gfs2_quota_lock_check(ip, &ap); if (error) goto out; error = gfs2_inplace_reserve(ip, &ap); if (error) goto out_quota; error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); if (error) goto out_ipreserv; error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation); ip->i_no_formal_ino = ip->i_generation; ip->i_inode.i_ino = ip->i_no_addr; ip->i_goal = ip->i_no_addr; gfs2_trans_end(sdp); out_ipreserv: gfs2_inplace_release(ip); out_quota: gfs2_quota_unlock(ip); out: return error; }


steven whitehousesteven whitehouse17293.99%660.00%
robert s. petersonrobert s. peterson84.37%330.00%
abhijith dasabhijith das31.64%110.00%

static void gfs2_init_dir(struct buffer_head *dibh, const struct gfs2_inode *parent) { struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); dent->de_inum = di->di_num; /* already GFS2 endian */ dent->de_type = cpu_to_be16(DT_DIR); dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); gfs2_inum_out(parent, dent); dent->de_type = cpu_to_be16(DT_DIR); }


steven whitehousesteven whitehouse139100.00%1100.00%

/** * gfs2_init_xattr - Initialise an xattr block for a new inode * @ip: The inode in question * * This sets up an empty xattr block for a new inode, ready to * take any ACLs, LSM xattrs, etc. */
static void gfs2_init_xattr(struct gfs2_inode *ip) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); struct buffer_head *bh; struct gfs2_ea_header *ea; bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); gfs2_trans_add_meta(ip->i_gl, bh); gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); ea = GFS2_EA_BH2FIRST(bh); ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); ea->ea_type = GFS2_EATYPE_UNUSED; ea->ea_flags = GFS2_EAFLAG_LAST; brelse(bh); }


steven whitehousesteven whitehouse111100.00%1100.00%

/** * init_dinode - Fill in a new dinode structure * @dip: The directory this inode is being created in * @ip: The inode * @symname: The symlink destination (if a symlink) * @bhp: The buffer head (returned to caller) * */
static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, const char *symname) { struct gfs2_dinode *di; struct buffer_head *dibh; dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); gfs2_trans_add_meta(ip->i_gl, dibh); di = (struct gfs2_dinode *)dibh->b_data; gfs2_dinode_out(ip, di); di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); di->__pad1 = 0; di->__pad2 = 0; di->__pad3 = 0; memset(&di->__pad4, 0, sizeof(di->__pad4)); memset(&di->di_reserved, 0, sizeof(di->di_reserved)); gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); switch(ip->i_inode.i_mode & S_IFMT) { case S_IFDIR: gfs2_init_dir(dibh, dip); break; case S_IFLNK: memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); break; } set_buffer_uptodate(dibh); brelse(dibh); }


steven whitehousesteven whitehouse224100.00%6100.00%

/** * gfs2_trans_da_blocks - Calculate number of blocks to link inode * @dip: The directory we are linking into * @da: The dir add information * @nr_inodes: The number of inodes involved * * This calculate the number of blocks we need to reserve in a * transaction to link @nr_inodes into a directory. In most cases * @nr_inodes will be 2 (the directory plus the inode being linked in) * but in case of rename, 4 may be required. * * Returns: Number of blocks */
static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, const struct gfs2_diradd *da, unsigned nr_inodes) { return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; }


steven whitehousesteven whitehouse45100.00%1100.00%

static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, struct gfs2_inode *ip, struct gfs2_diradd *da) { struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; int error; if (da->nr_blocks) { error = gfs2_quota_lock_check(dip, &ap); if (error) goto fail_quota_locks; error = gfs2_inplace_reserve(dip, &ap); if (error) goto fail_quota_locks; error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); if (error) goto fail_ipreserv; } else { error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); if (error) goto fail_quota_locks; } error = gfs2_dir_add(&dip->i_inode, name, ip, da); gfs2_trans_end(sdp); fail_ipreserv: gfs2_inplace_release(dip); fail_quota_locks: gfs2_quota_unlock(dip); return error; }


steven whitehousesteven whitehouse18297.85%880.00%
abhijith dasabhijith das31.61%110.00%
robert s. petersonrobert s. peterson10.54%110.00%

static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, void *fs_info) { const struct xattr *xattr; int err = 0; for (xattr = xattr_array; xattr->name != NULL; xattr++) { err = __gfs2_xattr_set(inode, xattr->name, xattr->value, xattr->value_len, 0, GFS2_EATYPE_SECURITY); if (err < 0) break; } return err; }


mimi zoharmimi zohar4757.32%133.33%
steven whitehousesteven whitehouse3441.46%133.33%
h hartley sweetenh hartley sweeten11.22%133.33%

/** * gfs2_create_inode - Create a new inode * @dir: The parent directory * @dentry: The new dentry * @file: If non-NULL, the file which is being opened * @mode: The permissions on the new inode * @dev: For device nodes, this is the device number * @symname: For symlinks, this is the link destination * @size: The initial size of the inode (ignored for directories) * * Returns: 0 on success, or error code */
static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, struct file *file, umode_t mode, dev_t dev, const char *symname, unsigned int size, int excl, int *opened) { const struct qstr *name = &dentry->d_name; struct posix_acl *default_acl, *acl; struct gfs2_holder ghs[2]; struct inode *inode = NULL; struct gfs2_inode *dip = GFS2_I(dir), *ip; struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); struct gfs2_glock *io_gl = NULL; int error, free_vfs_inode = 1; u32 aflags = 0; unsigned blocks = 1; struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; if (!name->len || name->len > GFS2_FNAMESIZE) return -ENAMETOOLONG; error = gfs2_rsqa_alloc(dip); if (error) return error; error = gfs2_rindex_update(sdp); if (error) return error; error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); if (error) goto fail; error = create_ok(dip, name, mode); if (error) goto fail_gunlock; inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); error = PTR_ERR(inode); if (!IS_ERR(inode)) { if (S_ISDIR(inode->i_mode)) { iput(inode); inode = ERR_PTR(-EISDIR); goto fail_gunlock; } d_instantiate(dentry, inode); error = 0; if (file) { if (S_ISREG(inode->i_mode)) error = finish_open(file, dentry, gfs2_open_common, opened); else error = finish_no_open(file, NULL); } gfs2_glock_dq_uninit(ghs); return error; } else if (error != -ENOENT)