cregit-Linux how code gets into the kernel

Release 4.10 fs/orangefs/dcache.c

Directory: fs/orangefs
/*
 * (C) 2001 Clemson University and The University of Chicago
 *
 * See COPYING in top-level directory.
 */

/*
 *  Implementation of dentry (directory cache) functions.
 */

#include "protocol.h"
#include "orangefs-kernel.h"

/* Returns 1 if dentry can still be trusted, else 0. */

static int orangefs_revalidate_lookup(struct dentry *dentry) { struct dentry *parent_dentry = dget_parent(dentry); struct inode *parent_inode = parent_dentry->d_inode; struct orangefs_inode_s *parent = ORANGEFS_I(parent_inode); struct inode *inode = dentry->d_inode; struct orangefs_kernel_op_s *new_op; int ret = 0; int err = 0; gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: attempting lookup.\n", __func__); new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP); if (!new_op) goto out_put_parent; new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW; new_op->upcall.req.lookup.parent_refn = parent->refn; strncpy(new_op->upcall.req.lookup.d_name, dentry->d_name.name, ORANGEFS_NAME_MAX); gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d interrupt flag [%d]\n", __FILE__, __func__, __LINE__, get_interruptible_flag(parent_inode)); err = service_operation(new_op, "orangefs_lookup", get_interruptible_flag(parent_inode)); /* Positive dentry: reject if error or not the same inode. */ if (inode) { if (err) { gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d lookup failure.\n", __FILE__, __func__, __LINE__); goto out_drop; } if (!match_handle(new_op->downcall.resp.lookup.refn.khandle, inode)) { gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d no match.\n", __FILE__, __func__, __LINE__); goto out_drop; } /* Negative dentry: reject if success or error other than ENOENT. */ } else { gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: negative dentry.\n", __func__); if (!err || err != -ENOENT) { if (new_op->downcall.status != 0) gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d lookup failure.\n", __FILE__, __func__, __LINE__); goto out_drop; } } orangefs_set_timeout(dentry); ret = 1; out_release_op: op_release(new_op); out_put_parent: dput(parent_dentry); return ret; out_drop: gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d revalidate failed\n", __FILE__, __func__, __LINE__); goto out_release_op; }

Contributors

PersonTokensPropCommitsCommitProp
mike marshallmike marshall24574.47%116.67%
martin brandenburgmartin brandenburg7422.49%350.00%
yi liuyi liu72.13%116.67%
miklos szeredimiklos szeredi30.91%116.67%
Total329100.00%6100.00%

/* * Verify that dentry is valid. * * Should return 1 if dentry can still be trusted, else 0. */
static int orangefs_d_revalidate(struct dentry *dentry, unsigned int flags) { int ret; unsigned long time = (unsigned long) dentry->d_fsdata; if (time_before(jiffies, time)) return 1; if (flags & LOOKUP_RCU) return -ECHILD; gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: called on dentry %p.\n", __func__, dentry); /* skip root handle lookups. */ if (dentry->d_inode && is_root_handle(dentry->d_inode)) return 1; /* * If this passes, the positive dentry still exists or the negative * dentry still does not exist. */ if (!orangefs_revalidate_lookup(dentry)) return 0; /* We do not need to continue with negative dentries. */ if (!dentry->d_inode) goto out; /* Now we must perform a getattr to validate the inode contents. */ ret = orangefs_inode_check_changed(dentry->d_inode); if (ret < 0) { gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d getattr failure.\n", __FILE__, __func__, __LINE__); return 0; } if (ret == 0) return 0; out: gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: negative dentry or positive dentry and inode valid.\n", __func__); return 1; }

Contributors

PersonTokensPropCommitsCommitProp
martin brandenburgmartin brandenburg8452.50%450.00%
mike marshallmike marshall6238.75%225.00%
miklos szeredimiklos szeredi138.12%112.50%
yi liuyi liu10.62%112.50%
Total160100.00%8100.00%

const struct dentry_operations orangefs_dentry_operations = { .d_revalidate = orangefs_d_revalidate, };

Overall Contributors

PersonTokensPropCommitsCommitProp
mike marshallmike marshall32763.99%330.00%
martin brandenburgmartin brandenburg15830.92%550.00%
miklos szeredimiklos szeredi163.13%110.00%
yi liuyi liu101.96%110.00%
Total511100.00%10100.00%
Directory: fs/orangefs
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